® ®
Rex® Engineering Manual
Rex® TableTop®
EngineeringManual
CONVEYOR LENGTH AND CONFIGURATION
STRAIGHT -
TRANSFER END START
Figure A
Figure B
- A B
START START
END I I I I I I I END
Figure A Figure B
SIDEFLEXING VS
A B VS
ENDSTART
Rexnord does not build conveyors which use TableTop® chains,
nor does it specify one conveyor design over another. However,
based on many years of application experience, Rexnord is well
qualified to point out general guidelines and alternatives in
conveyor systems design, chain application and chain selection.
Conveyor systems design consists of Systems Economics and
Cost which involves:
1. Conveyor Length and Configuration
2. Chain Width and Speed
3. Overall Conveyor Cost
4. Maintenance
Begin with a review of the overall layout including space
available, structural obstructions and process machinery and the
relative positions of different machines. Then, using the following
considerations, arrive at the optimum machinery and conveyor
layout for proper utilization of TableTop® chains.
The longest, simplest configuration possible, (Fig B) is always
the best. However, sometimes short conveyors with several
transfers must be used to change speeds, change inclines,
accumulate, etc.
Use sideflexing chains and run as far as possible. This
alternative (Fig B) offers the following advantages over Figure A:
Elimination of transfers over dead-plates and turntables.
Less tipping and jamming, less noise.
Elimination of product slippage at transfer points.
Reduction of expense for attendant machinery including motors,
sprockets, etc.
Reduction of expense for attendant machinery including dead-
plates and turntables.
The criteria for conveyor width and speed is the number of
products which must be delivered to a location per unit of time.
The infeed and outfeed of each process machine will dictate
product flow width at the machines. But in-between, the
alternatives range from high speed-single file to intermediate
speed-multiple file on one wide chain to slow speed-multiple file
on multiple wide strands.
Weigh the advantages and disadvantages of each:
Single File Multiple File
High Speed Slow Speed
ADVANTAGES
Less expensive chain Longer chain life due to
slow speed
Less expensive initial Less chance of product
conveyor cost tippage
Longer runs In-line accumulation
less noise
DISADVANTAGES
Faster chain wear More expensive chain
More wear on products More expensive initial
when slippage occurs conveyor cost
More chance of product Shorter runs
tippage and jam-ups
Noisier Multiple chain strands may
cause transfer problems
To determine chain widths and see Page 14, Multiflex.
OVERALL CONVEYOR COST
Overall conveyor cost includes:
1. The cost of one chain versus another.
2. The cost of more efficient chains versus the cost of drives
and transfer equipment.
3. The cost of structural components of one system versus
another.
MAINTENANCE
Of course, keep in mind the future conveyor maintenance. A
system which is less expensive initially will usually require more
maintenance later on.
IN CONCLUSION
There may be more than one right way to utilize TableTop®
chains. Consider the alternatives of length, configuration, width,
speed and cost to design a system which is both economical for
the fabricator and the user.
Rex® Engineering Manual TT-1
INTRODUCTION
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STRAIGHT RUNNING CONVEYOR DESIGN
TRANSFER
DRIVE SPROCKETSEE PAGE 8
CHAINCATENARY
"SAG"SEE PAGE 7
ENTRY RADIUS
SEE PAGE 7
RETURNWEAR STRIP
OR
ROLLER RETURN WAY
SLIDINGRETURN WAY
BROKEN CONTACT
GUIDE RAILSUPPORT
TRAVEL
DEAD-PLATE TRANSFERSEE PAGE 6
TURNABLETRANSFER
SEE PAGE 6
IDLERWHEEL
SEE PAGE
8
CARRYING WEAR STRIP
CARRYING WAY
CARRYING WAY
RETURN WAY
CHAIN
GUIDE RAIL
Straight running chains were the original TableTop® chains.
They required auxiliary means of transferring around corners
such as the dead plate and turntable shown below. The
illustration on this page shows the basics of a simple straight
running conveyor.
There are many variations on this design, so Rexnord
Engineers are available to assist and make recommendations
for any TableTop® application.
Guide clearance, space between wear strips for proper chain
tracking.
At sprocket-chain flex points, the top
plate kick-up should be taken into
account for the best performance in
product transfer. Especially when
using chains 843, 963, and 3873.
Consult Rexnord for specifics.
TT-2 Rex® Engineering Manual
STRAIGHT
RUNNING
CHAINS
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CONVEYOR DESIGN SIDEFLEXING
STRAIGHT SECTIONCORNER SECTION
RECTANGULARCARRYING WAY FOR
TAB CHAINBEVEL CARRYING WAYFOR BEVELED CHAINS
RECTANGULARCARRYING WAY FOR
BEVEL OR TAB CHAINS
CHAIN
CARRYING WAY
CARRYING WEAR STRIP
GUIDE RAIL
RETURN WAY
RETURNWEAR STRIP
CHAIN
SLIDINGRETURN WAY
BROKEN CONTACTRECTANGULAR
RETURN WAYBEVEL
RETURN WAY
STRAIGHT SECTIONONLY
CORNER and STRAIGHTSECTION
FOR TAB CHAINS ONLY
CORNER SECTION ONLYFOR BEVELED CHAINS
The simplicity of the sideflex chain concept eliminates the
need for corner transfers; turntables, dead-plates and
attendant machinery. Rex® sideflexing conveyor chains solve
those conveyor problems where high speed transfers of
product was once a hazardous risk at best - where mass
handling to single-line conveying was a perplexing problem -
where plant layout was sacrificed for lack of design flexibility.
The illustration below shows the basics of a simple sideflexing
conveyor design. Other specifics are shown on Pages 4-8,
TableTop®. Consult Rexnord for additional information:
speeds, inclines, guide rails, etc.; to suit your particular needs.
Guide clearance, space between wear strips for proper chain
tracking.
SIDEFLEXING
CHAIN
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Rex® Engineering Manual TT-3
STRAIGHT RUNS
(For straight running sideflexing (Bevel Tab) chains)
SLIDING RETURN WAY ROLLER
'SE RPE NTI N E STYLE" RETURN WAY
MOUNTING BRACKET
INSIDE OF TURN
CORNERS
BEVELED CHAIN
'
OF TURN
MULTIPLE STRAND CORNERS
TYPICAL
TAB CHAIN
MINIMUM CLEARANCE
GC* CURVE
INSIDE
TURN
TYPICAL
INSIDE
OF TURN
Note: Dimensions subject to change. Certified dimensions of ordered material furnished on request.
&&
INSIDE
1/8" MINIMUM CLEARANCE
1/4" MINIMUM CLEARANCE
1/8" MINCLEARANCE
1/8" MINCLEARANCE
1/8" MINCLEARANCE
1/4" MINCLEARANCE
1/4" MINCLEARANCE
1/4" MINCLEARANCE
MOUNTING BRACKET
1/16" CLEARANCE
SAFETYRAIL
3/8"
1/16" - 1/8" TYPICAL
1/16" - 1/8" TYPICAL
*Guide clearances, straight and curve, are shown on individual chain listing pages.
STRAIGHT RUNS
(For straight running sideflexing (Bevel Tab) chains)
SLIDING RETURN WAY ROLLER
'SE RPE NTI N E STYLE" RETURN WAY
MOUNTING BRACKET
INSIDE OF TURN
CORNERS
BEVELED CHAIN
'
OF TURN
MULTIPLE STRAND CORNERS
TYPICAL
TAB CHAIN
MINIMUM CLEARANCE
GC* CURVE
INSIDE
TURN
TYPICAL
INSIDE
OF TURN
Note: Dimensions subject to change. Certified dimensions of ordered material furnished on request.
&&
INSIDE
1/8" MINIMUM CLEARANCE
1/4" MINIMUM CLEARANCE
1/8" MINCLEARANCE
1/8" MINCLEARANCE
1/8" MINCLEARANCE
1/4" MINCLEARANCE
1/4" MINCLEARANCE
1/4" MINCLEARANCE
MOUNTING BRACKET
1/16" CLEARANCE
SAFETYRAIL
3/8"
1/16" - 1/8" TYPICAL
1/16" - 1/8" TYPICAL
*Guide clearances, straight and curve, are shown on individual chain listing pages.
RETURN WAYS
CARRYING WAYS
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TT-4 Rex® Engineering Manual
STRAIGHT RUNNING
(Bevel
STRAIGHT SECTION CORNER
WEAR STRIPS
(Tab
CORNER STRAIGHT SECTION
INSIDE OF TURN
listing pages.
Note: Dimensions subject to change. Certified dimensions of ordered material furnished on request.
1" MIN.
SIDEFLEXING
SIDEFLEXING Style)
Style)
GC*
GC*STRAIGHT
GC*CURVE
GC*STRAIGHT
GC*CURVE
CORNER WEAR STRIPS
CORNER WEAR STRIPS
1" MIN. 1" MIN.
1" MIN. 1" MIN.
INSIDE OF TURN
1/8" MINIMUMCLEARANCE
1/4" MINIMUMCLEARANCE
*Guide clearances, straight and curve, are shown on individual chain
CARRYING WAYS
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Rex® Engineering Manual TT-5
CHAIN
SIDE TRANSFERS
OUTFEED CHAIN
VARIABLE WIDTH
DEAD-PLATE TRANSFERS
OUTFEED CHAIN
TURNTABLE TRANSFERS
INFEED
OUTFEED CHAIN
CHAIN
INFEED
1/32" 1/32" 1/32", APPROX.
CHAIN
INFEED
1/32" 1/32"
In the operation of TableTop® chain conveyors, smooth
transfer of the conveyed product from one chain to another
is essential for product protection and prevention of
downtime. The various methods are described below.
Side transfers are the least costly and the preferred method
of product transfer. Although simple in theory, care must be
taken to assure that the chain strands are operating on the
same level or the outfeed chain should be slightly lower.
Guide rail positioning, chain wear strip spacing and chain
speeds must all be adjusted to provide smooth product flow.
A typical dead-plate transfer is shown. For smoothest
operation, the dead-plate should be mounted so that it is
perfectly aligned with or slightly higher than the top surface
of the outfeed chain at the highest chordal position of the
sprocket. It should have a slight bevel and be as narrow as
possible so that the product conveyed transfers on and off
the dead-plate without obstruction.
Flexible dead-plates can "float" with the chordal action of
the chain on the tail sprocket with out producing excessive
wear.
Extreme precautions should be taken to properly install and
adjust dead-plates, particularly rigid dead-plates.
The principles for turntables are basically the same as for
dead-plates. Alignment is vitally important to assure smooth
product transfer. The edge of the turntable is usually beveled.
Turntables should be mounted slightly lower than the infeed
chain and slightly higher than the outfeed chain. This
adjustment should be level to 1/32-inch difference in
elevation.
TRANSFERS
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TT-6 Rex® Engineering Manual
RADII-INCHES
All TableTop® chain conveyors should provide for proper amount
of catenary sag to balance the chain tension which is not
absorbed by the drive sprocket teeth. TableTop® chains should
never be run tight. If chain sag is excessive or increases due to
wear, it should be adjusted, by removing links, to the proper
amount of sag. Take-ups are not recommended. If space does
not permit catenary sag, consult Rexnord Corp.
CATENARY SAG
ENTRY RADIUS
A generous entry radius to the return section should be provided.
This permits the chain to feed smoothly onto the return ways.
This curve radius should be greater than the minimum
backflex radius for the chain.
For TAB chains to be returned on hold-down TABs, it is
recommended that chains be guided onto the return wear strips
using a guide shoe or pan with a generous entry radius greater
than the minimum backflex radius.
At the entry to the return wear strips, provide rounded corners to
prevent catching or snagging of chain flights.
ROLLER RETURNS
As illustrated, instead of sliding returns, chain may be returned on
support rollers or shoes. It is important that the first roller or
support shoe be located far enough away from the head sprocket
to allow for proper catenary sag; dimension "A" should be greater
than the distance between rollers, "B".
The preferred diameter of rollers should be at least two times
greater than the minimum backflex radius for the chain. (Refer to
table "Minimum Backflex Radii"). For example, when used with
820 Series chains, roller diameter should be 3 inches or greater.
Roller and support shoe returns are not recommended for
base roller chain design chains.
TRAVELHEAD
DRIVER150° MIN. WRAP
ENTRY RADIUS
TAIL
CHAIN SAG -- 3" TO 5" WHEN RUNNING
18" TO 20"TYPICAL SPACING
NOTE: 2'-3-1/2" FOR 1843
NOTE: 20-24" FOR BASE ROLLER CHAINS
RETURN WEAR STRIPS
GUIDE WITH PROPERENTRY RADIUS
ENTRYDIRECTION
RELIEF OR RADIUS
ENTRY DIRECTION
Top View
Side View
RETURNWEAR STRIPS
MINIMUM BACKFLEX RADII - INCHES
815
820, 831
821
843
845
963
879, 880
61/2"
11/2"
11/2"
6"
18"
6"
11/2"
881
882
1843
1873
1874
3873
LBP821
LBP882
LBP883
11/2"
11/2"
21/2"
12"
10"
7"
16"
9"
2"
Chain SeriesNumber
Min. BackflexRadius
Chain SeriesNumber
Min. BackflexRadius
USE LAST ROLLER OR AGUIDE SHOE (AS SHOWNABOVE) TO GUIDESIDEFLEXING CHAIN ONTO CORNERRETURN WEAR STRIPS
B B(1 - 2 FT)
A(1.5 X B)
HEADSPROCKET
CORNERWEAR STRIPS
NOTE: Allow for 3873 top plate "kick-up" at headshaft of 0.15-
inches and at tailshaft 0.50-inches.
CATENARY SAG
ENTRY RADIUS
ROLLER
RETURNS
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Rex® Engineering Manual TT-7
A chain rises and falls slightly due to a chordal action as it
enters a drive sprocket, or leaves a tail sprocket. Therefore,
the sprocket should be mounted so that the highest point of
the sprocket is no higher than the top of the carrying way
wear strip, otherwise the chain will rise out of the carrying
way. The distance from the end of the wear strip to the
sprocket shaft centerline should equal dimension "B", or the
wear strip will interfere with the free articulation of the chain
as it enters the sprocket. Also, the leading edges of the wear
strip should be beveled.
The following formula and dimensions used in conjunction
with the figure will give the recommended positioning of the
sprocket in relation to the top of the wear strips.
WAYC *
B
TOP OF WEAR STRIP
A +1/32 -.000
WEAR STRIP
· Recommended distance from chain C to top of wear stripL
0.094
0.109
0.125
0.141
0.188
0.234
0.266
0.406
0.438
0.468
831
879
815, 820, 821, LBP821, 881
880
882, LBP882, LBP883
843, 845
1843
863, 864, 963, 1873, 3873, 4873
1874, 4874
279
C Values Chain Series Numbers
C = Dimension Values
For Conventional Chains:
A = (Pitch Diameter) + C
B = Dimensional Values
2
Chain Series NumbersB Values. Inches
1
1-1/2
843, 845, 1843
815, 820, 821, 831, 963, 864, 879, 880, 881, 8821873, 1874, 3873, LBP821, LBP882, LBP883
The idler wheel can be used in place of tail sprockets on
TableTop® one-piece link chain conveyors only. They are
made of an engineering plastic material; are self-lubricating,
and are resistant to most chemical solutions and corrosive
environments. In existing conveyors, the idler wheel can be
installed with only minor conveyor adjustments. Simply take
off the tail sprocket and remove any burrs or sharp edges
from the shaft. Using two set collars, place the idler wheel on
the shaft, space and tighten the set collars. For proper
location and smooth operation, the idler wheel should be
mounted slightly below the top of the wear strips.
Note: Do not use idler wheels with base roller chain design chains.
RECOMMENDED
SET COLLAR
CLEARANCE
1/32"
IN CORROSIVE
ENVIRONMENT
STAINLESS STEEL
SHAFTING RECOMMENDED
**
1-1/2"
A * 1/32
.000
In new conveyors, the idler wheel can easily be incorporated
into the conveyor frame. The shaft does not have to rotate,
therefore bearings are not required.
* Distance from centerline of idler wheel shaft to the chain top plate support surface.
** For abrasive applications, allow at least 3 inches.
"A" Values -- Inches
21T Idler Wheel 23T Idler Wheel 25T Idler Wheel 27T Idler Wheel
2.700 2.940 3.170 3.410
SPROCKET &
WEAR STRIP
POSITIONING
IDLER WHEEL
LOCATION &
POSITIONING
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TT-8 Rex® Engineering Manual
SERPENTINE STYLE RETURN FOR OR
FULL WIDTH RETURN FOR USE WITH OR
TAB STYLE RETURN FOR AND CHAINS
·Sprocket and Wear Track Positioning
Dimension "A" is the dimension from the centerline of the
sprocket to the top of the wear track.
For LBP821 "A" = (P.D. + 0.125) (P.D. = Pitch Diameter)
2
For LBP882 and LBP883 "A" = (P.D. + 0.19)
2
__
+1/32 -0
__+1/32 -00
Dimension "B" is the dimension from the centerline of the
sprocket to the end of the wear track.
· Transfer Plate Positioning
Dimension "C" is the dimension from the centerline of the
sprocket to the top of the transfer plate.
"C" = ("A" + 7.5)+0-1/32
"C" "A"
"B"(1-1/2" -- 2")
(2" -- 4")
(20" -- 24")
MINIMUM ENTRY
RADIUS "R"
Chain No.In. mm
"R"
LBP821LBP882 TABLBP883
1692
406 229 51
FULL WIDTH SLIDING RETURN FOR USEWITH LBP821, LBP882 TAB, OR LBP883 TAB
SERPENTINE STYLE RETURN FORWITH LBP821, LBP882 TAB, OR LBP883 TAB
TAB STYLE RETURN FOR LBP882 TAB AND LBP883 TAB
Side View Top View
LBP CHAIN
SPROCKET
& WEAR STRIP
POSITIONING
RETURN
CONSTRUCTION
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Rex® Engineering Manual TT-9
An intermediate drive allows a continuous strand of conveyor
chain to operate at longer conveyor centers than possible with a
single drive. Each intermediate drive operates in such a way that
the same strand of chain continues on past the drive to the next
drive.
Two intermediate drive arrangements are:
Tangential Drive
Offset Wrap Drive
TANGENTIAL DRIVE
With this approach the chain, while operating in a straight line, is
engaged by the drive sprocket in a manner similar to a rack and
pinion. Although this approach has a certain degree of simplicity
it has a few shortcomings. First, the entire conveyor system must
be run tight to insure that the chain doesn't "bunch up" after
exiting the sprocket. Second, the chain tends to eject outward
from the sprocket tooth, particularly under high peak loads.
Contact Rexnord Corp. for additional comments.
OFFSET WRAP DRIVE
Unlike a tangential drive, this approach is limited to chains having
sideflexing capability.
Essentially, the unabsorbed chain tension (as well as excess
chain) at the drive sprocket is compensated for by a catenary.
The chain the engages an idler (tail) sprocket or wheel and then
continues on as a carry strand.
OFFSET DRIVE
BASIC DRIVE CONCEPT
DIRECTION OF TRAVEL
GUIDE SHOE
GUIDE SHOE
INLINE TRANSFER
DRIVESPROCKET
IDLERSPROCKET
CURVED SECTION (S)
CATENARY -- accommodates excess chain and balances drivesprocket absorbed tension.
SIDE TRANSFER
DRIVESPROCKET
IDLERSPROCKET
CATENARY -- accommodates excess chain and balances drivesprocket absorbed tension.
SHOES -- (optional) to insure that chain properly disengages drivesprocket and engages idler sprocket.
INTERMEDIATE
DRIVE
ARRANGEMENTS
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TT-10 Rex® Engineering Manual
Rex® MatTop®
EngineeringManual
Wear Strip Material Selection
Proper chain and wear strip selection will provide
optimum chain and wear strip life. Friction and wear
resistance are two factors which should be considered
when selecting a wear strip material.
1. The lower the coefficient of friction between the chain
and wear strip, the longer the chain life.
2. The greater the wear resistance of the chain and wear
strip materials, the longer the chain life and wear strip
life.
Of course, the combination of chain tension, top load,
type of lubrication, abrasion, and speed of a given
conveyor will govern the final wear rate of a particular
chain-wear strip combination. The worst condition is high
speed, dry operation.
Rexnord has accumulated many years of application
experience as well as laboratory test data on chain-wear
strip compatibility. The following general guideline will
help in the selection wear strip materials.
Metal Wear Strips
Metal wear strips are harder than non-metallics, and in
addition can be heat treated or work hardened to
increase hardness. They are, therefore, suited for
applications where abrasive particles are present either
from the environment or from the products carried.
Abrasive particles are less likely to embed in metal wear
strips.
For non-corrosive environments, plain carbon steel , cold
finished, is recommended. For corrosive environments,
use stainless steel, one quarter temper minimum (25 Rc),
cold finish.
SELECTION PROCEDURE
Application Information
If properly selected and applied, chain will wear out in
service before it breaks from fatigue.
Selection of the proper chain for a specific application
requires that all of the following information be known:
· Conveyor length
· Conveyor width
· Wear track material
· Top load (weight per square foot or weight per square
meter)
· Chain speed (feet per minute or meters per minute)
· Operating conditions (dry or lubricated)
· Environment (abrasiveness, temperature, chemical
activity, etc.)
· Accumulation requirements (slippage)
· Attachments required
· Type of transfer plate
Chain Material Selection
Besides temperature and strength factors, ir is important
to consider chemical, wear and impact resistance.
Chemical resistance should be considered for
applications where bleach, acid, etc. are present. HT and
LT materials have the best chemical resistance. Always
consult the chemical resistance chart (Page 4, MatTop®)
or Rexnord if unsure about material - chemical
compatibility. Consider pin material resistance, too.
Impact resistance can be obtained from the LT material.
Moderate to severe impacts are easily handled by LT
whereas LF and HT materials offer small to moderate
resistance.
SELECTION
PROCEDURE
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MT-1 Rex® Engineering Manual
STEEL
Plain carbon, cold rolled steel is recommended. Surface
finish should be 32-63 RMS. Use heat treatable grades
where available and hardened to 25-30 Rc. Lubricants
used should have rust inhibitors added.
STAINLESS STEEL
Cold rolled finish (32-63 RMS) is recommended. An
austenitic grade offers the best corrosion resistance.
The softer annealed grades of austenitic stainless steel are
NOT RECOMMENDED, especially with thermoplastic
chains. Interaction between the chain material and the soft
stainless steel might develop. When this happens, the
resulting wear debris consists almost entirely of finely
divided stainless steel particles, nearly black in color, similar
to molydisulfide or graphite. The wear of the stainless steel
might be rapid while the thermoplastic chain by contrast
exhibits only slight wear.
Therefore, ONE QUARTER TEMPER (MINIMUM 25 Rc.)
austenitic grade stainless is recommended for use with
any of the chain materials, but especially with
thermoplastic. Martensitic stainless steels can also be
used. They offer excellent wear resistance when heat
treated to 25-35 Rc, but they are not as corrosion
resistant at austenitic.
BRONZE AND BRASSES
A hard temper material is recommended since a soft bronze
wears rapidly. Typical applications calling for these metals
are those which require non-sparking and anti-static
conditions. These materials are generally not
recommended.
ALUMINUM
Not recommended due to poor wear resistance.
NON-METALLIC WEAR STRIPS
Non-metallic wear strips have a lower coefficient of friction
than metals. They are generally easier to install and remove
and provide for quieter operation. Ultra high molecular
weight polyethylene is the most commonly used wear strip
material.
ULTRA HIGH MOLECULAR WEIGHT
POLYETHYLENE UHMWP
UHMWP polyethylene (molecular weight of at least 1.0
million) is recommended for both dry and wet applications.
UHMWP is virtually unaffected by moisture and is resistant
to corrosive chemicals. It is not very rigid and may deflect
when subjected to high loads. UHMWPE is not
recommended for abrasive conditions where particles may
embed in the surface and wear the chain.
TEFLON
This material has perhaps the lowest coefficient of friction
available in a plastic wear strip material. It is soft and tends
to flow off the surface and is not practical as a wear strip
material except in low load - low speed applications.
SELECTION
PROCEDURE
cont.
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since it does not require machining for bearings. Hence,
this is the least expensive bore or shaft choice.
Square or hex bore sprockets are best suited for high or
low temperature applications. Since thermoplastic chains
will expand or contact with large temperature swings, it is
important that the sprockets be able to move along the
shaft to follow the chain. Only one or more of the
sprockets need to be locked to the shaft to track the
chain; the remaining sprockets may float.
Sprocket material is also an important consideration
especially in the presence of chemicals, abrasives, or
high temperatures. Consult Rexnord for more
information.
Sprocket and Bore Style Selection
Choose the largest sprocket pitch diameter possible
since this will give the greatest chain life. Larger pitch
diameter sprockets cause less chain articulation thus
producing less pin-joint wear. High speed conveyors are
applications where larger pitch diameter sprockets are
desired.
High load applications should also favor larger pitch
diameter sprockets because these sprockets will give
more tooth-chain contact and distribute the load more
evenly.
General conveying applications may use most sprocket
sizes. Product transfer, transfer distance, or retrofit
applications will dictate the sprocket size in most cases.
Round bore sprockets are most commonly used. Round
shafting has a distinct advantage over square shafting
SELECTION
PROCEDURE
cont.
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MT-3 Rex® Engineering Manual
CORROSION RESISTANCE GUIDE- CHAIN AND WEAR STRIP MATERIALS
Common or Chemical Name
Solutions contained in the product conveyed as well
as solutions used to clean or lubricate the chain and
equipment may result in corrosive attack of chain
and tracks. Chain and track material have varying
degrees of resistance to corrosion. Use this guide to
help you select chain materials for various corrosive
environments.
With LF/Acetal thermoplastics, do not use cleaning
or lubricating agents with a pH below 4 or above 10,
or chemicals containing chlorine or free ammonia.
These agents may cause immediate attack or
"crazing" after several applications due to
concentration by evaporation.
This table is based on data available by suppliers of
the various materials. For those chemicals with a
marginal or unsatisfactory rating - or for chemicals
not included - contact Rexnord for
recommendations.
Steel
Nylon
and
Nylatron®Austenitic
Series
Ferritic*
and
Martensitic
Series
LF
Acetal
and
Acetal
Chemically
Resistant
Plastic
(P)
Ultra High
Molecular
Weight
Polyethylene
(UHMWPE)
Poly-
propylene
(HT)
Poly-
ethylene
(LT)
(DATA BASED UPON 68°f)
Acetic Acid (over 5%-up to 50%
Acetone
Alcohol
Ammonia
Beer
Beverages-Soft Drinks
Benzene
Brine (pickle)
Carbon Tetrachloride
Chlorine
Citric Acid
Cyclohexane
Ethyl Chloride
Formaldehyde
Formic Acid
Fruit Juices
Gasoline
Hexane
Hydrochloric Acid (up to 2%)
Hydrochloric Acid (up to 37%)
Hydrogen Peroxide
Iodine
Isopropanol (isopropyl alcohol)
Kepodene
Lactic Acid
Methylene Chloride
Milk
Muriatic Acid
Nitric Acid (low concentrations)
Oil (vegetable or mineral)
Paraffin
Phosphoric Acid (up to 10%)
Soap and Water
Sodium Chloride
Sodium Hydroxide (up to 25%)
Sodium Hypochlorite (Bleach)
Stearic Acid
Sulphuric Acid (up to 40%)
Toluene (Toluol)
Turpentine
Vegetable Juices
Vinegar
Water (fresh)
Whiskey
Wine
Xylene
U
U
S
M
S
S
S
U
M
U
U
S
U
S
U
U
U
U
S
S
U
S
U
U
S
S
U
M
U
U
U
U
U
S
M
U
U
S
S
S
M
S
S
S
S
S
S
M
S
U
M
S
S
U
S
U
U
U
U
S
S
M
S
U
U
S
S
U
S
S
U
U
S
U
S
S
S
S
S
S
S
S
M
S
S
S
S
S
S
M
M
U
S
S
S
U
S
S
S
U
U
S
U
S
S
S
S
U
U
S
S
S
S
M
S
U
S
U
S
S
S
S
S
S
S
S
U
S
S
S
S
S
S
U
M
U
M
S
U
S
S
S
U
U
M
U
S
S
U
S
U
U
S
S
U
S
U
S
U
S
U
S
S
U
S
S
S
S
U
S
S
U
S
S
S
M
S
U
M
S
S
S
U
S
S
S
U
U
U
U
S
S
S
S
S
U
U
S
S
U
S
S
S
U
M
U
M
S
S
S
S
S
S
S
S
S
S
S
S
S
M
S
M
S
S
U
M
S
S
M
U
U
S
S
S
M
S
M
S
U
S
S
S
S
S
S
S
S
S
S
S
S
U
U
S
S
S
S
S
M
S
S
S
S
S
S
M
S
M
S
S
U
M
S
S
M
S
S
S
M
S
M
S
S
S
S
S
M
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
U
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
U
S
S
S
U
S
S
S
S
S
S
S
S
U
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
M
S
M
S
S
U
M
S
S
M
U
U
S
S
S
M
S
M
S
U
S
S
S
S
S
S
S
S
S
S
S
S
U
U
S
S
S
S
S
M
SELECTION
PROCEDURE
cont.
Chemical
Corrosion
Rex
®M
atTop
®C
hain
s
Rex® Engineering Manual MT-4
TABLE 1 FRICTION FACTORS BETWEEN CHAIN AND WEAR TRACKS (Fw).
Friction Factors Between Chain And Weatherstrips (Fw)
Wear strip Material
Chain MaterialLubrication
Condition
Carbon And
Stainless
Steel
UHMWP and
Nylatron®
LF Acetal
Dry
Water
Soap & Water
Oil
Dry
Water
Soap & Water
Oil
Dry
Water
Soap & Water
Oil
Dry
Water
Soap & Water
Oil
HP Acetal
LT
(Polyethylene)
HT
(Polyethylene)
0.25
0.20
0.15
0.10
0.20
0.18
0.15
0.10
0.22
0.20
0.15
0.10
0.18
0.16
0.14
0.10
0.28
0.22
0.15
0.10
0.23
0.20
0.15
0.10
0.35
0.25
0.20
0.10
0.30
0.25
0.20
0.10
Note: For Roller Support, fw = 0.10
Friction Factors Between Chain And Products (Fm)
Chain Type and Material
Product Material
Lubrication
Condition
Plastic(Including PET)
DryWater
Soap & Water
Dry
DryWater
Soap & WaterOil
TABLE 2 FRICTION FACTORS BETWEEN CHAIN AND PRODUCTS (Fm).
DryWater
Soap & Water
DryWater
Soap & Water
DryWater
Soap & Water
DryWater
Soap & Water
Paper
Steel
Aluminum
Glass
ReturnableGlass Bottles
Non-ReturnableGlass Bottles
LF Acetal LF Acetal HP AcetalLT
PolyethyleneLT
PolyethyleneHT
Polyethylene
HTPolyethylene
Solid andPerforated Top
Solid andPerforated Top
Solid andPerforated Top
Raised Top Raised Top Raised TopSolid and
Perforated Top
0.20
0.18
0.15
0.18
0.14
0.10
0.18
0.16
0.14
0.22
0.19
0.15
0.19
0.16
0.12
0.30
0.25
0.20
0.24
0.20
0.16
0.30 0.22 0.25 0.30 0.25 0.35 0.28
0.25
0.20
0.15
0.10
0.16
0.14
0.10
0.08
0.18
0.16
0.13
0.10
0.28
0.22
0.15
0.10
0.25
0.18
0.12
0.08
0.35
0.25
0.20
0.10
0.28
0.20
0.16
0.08
0.20
0.15
0.12
0.13
0.11
0.08
0.18
0.14
0.12
0.22
0.17
0.12
0.20
0.14
0.10
0.28
0.19
0.16
0.22
0.15
0.13
0.15
0.13
0.10
0.12
0.10
0.08
0.14
0.12
0.10
0.18
0.14
0.10
0.14
0.11
0.08
0.22
0.17
0.10
0.20
0.15
0.10
0.20
0.16
0.14
0.16
0.12
0.11
0.18
0.16
0.14
0.27
0.17
0.14
0.19
0.14
0.11
0.29
0.21
0.14
0.27
0.18
0.14
0.15
0.13
0.10
0.12
0.10
0.08
0.13
0.11
0.10
0.18
0.14
0.10
0.14
0.11
0.08
0.22
0.17
0.10
0.20
0.15
0.10
Product Weight Formulas, Round Products Only
Formula for finding number of round containers per square foot (square meter) during fully packed conditions:
Containers per square foot = 166.277 Containers per square meter = 1.15 x 106
D = Container diameter, inches (mm)
D2 D2
SELECTION
PROCEDURE
cont.
Chain Tension
Calculations
Rex
®M
atTo
p®
Ch
ain
s
MT-5 Rex® Engineering Manual
TYPICAL CONVEYOR CONSTRUCTION
VIEW A- A GUIDE CLEARANCE
CHAIN WIDTH + "A"
Figure 9 - Typical Conveyor Construction
A
A
Calculation of guide clearance "GC" for
MatTop® Conveyors
For conveyors operating at room temperature
(70°F to 21°C);
GC = actual chain width + A (see Table 4 for A)
For conveyors operating at elevated
temperatures one must take thermal
expansion of the chain into account.
The actual width will increase by an
amount that is dependent upon
temperature, chain width, and the
coefficient of thermal expansion of
the plastic.
The coefficient of thermal expansion is:
C Thermal = 0.001 in (0.15 mm) Expansionor
m · °CFt · °F
Dimension "A" Conveyor Length
3/8
5/8
3/4
Up to 30'
30' - 50'
Over 50'
TABLE 4 STANDARD CONVEYOR
GUIDE CLEARANCE
Calculation of "GC" at Elevated Temperatures
Assume a 12ft. wide, 45 ft. lone pasteurizer
operating at an average temperature of 190°F.
1. The increase in the width ( W) due to the
temperature of 190° can be found as shown:
W = W (chain width in Ft or m)
x CThermal Expansion
x T (Temp. diff. from room
temp. of 70°F, 21°C)
W = [12 ft.] x [0.001 in]
x [190°F - 70°F]
Ft · °F
W = 1.44 in.
2. Allow for the standard clearance, "A",
based upon conveyor length. The conveyor
in the example is 45 ft. long. Table 4 gives
"A" = 5/8 in for conveyors between 30 ft. and 50 ft.
3. The total "GC" for this example is:
GC =12ft. (chain width@ 70°F)
+1.44 in. (expansion due to temperature)
+ 5/8 in. (standard clearance)
GC = 144 in. + 1.44 in. + 0.625 in.
GC = 146.065 146 1/16 in.~~
1.
2.
SELECTION
PROCEDURE
cont.
Conveyor
Design and
Construction
Rex
®M
atTop
®C
hain
s
Rex® Engineering Manual MT-6
Carry Way Supports
, TYP
Figure 10 Offset Rail
0 0
0 0 0
0 0 0 0
0 0 0
0 0 0 0
0 0 0
0 0 0 0
0 0 0
0 0 0 0
Figure 12 Solid Bed
NOTE: Openings should be provided for debris to escape. Not recom- mended for wet applications since a "suction" can be created between the chain and bed, especially if used as a return support.
CHAIN
CHAIN WIDTH
Figure 11 Cheveron or Herring Bone
Figure 13 Roller Supports
NOTE: The rollers must be rigid enough to
resist deflection. Roller beds are not suitable for all chains or applica- tions. Contact Rexnord for additional information.
3/4" Pitch Chains
1 1/2" Pitch Chains
2 1/4" Pitch Chains
DRef. = 1 1/2"
SRef. = 1 5/8"
DRef. = 2"
SRef. = 2 1/8"
DRef. = 2 1/2"
SRef. = 2 5/8"
6" TYP
2" TYP
CHAIN WIDTH
C CFL
6" TY
P
2" TY
P
D
S
SELECTION
PROCEDURE
cont.
Conveyor
Design and
Construction
Rex
®M
atTo
p®
Ch
ain
s
MT-7 Rex® Engineering Manual
Return Way Supports - chain without attachments
Figure 14 Full-Width Rollers, Thermoplastic, Rubber or Metal.
I
Figure 15 Staggered Rollers, or Rubber.
NOTE: The supports shown in the carry way section may also be used for return way supports.
Return Way Supports - chain with attachments
CHAIN WIDTH
Thermoplastic
1 1/2" MIN.
6"
MIN
.
1 1/2" MIN.
6"
MIN
.
Figure 16 Serpentine, Plastic Extrusions or Metal Rod.
SELECTION
PROCEDURE
cont.
Conveyor
Design and
Construction
Rex
®M
atTop
®C
hain
s
Rex® Engineering Manual MT-8
Figure 20 Catenary Tension and Sag
CATENARY TENSION CATENARY SAG
All Rex® MatTop® and TableTop® chains, operate
under true chain principles irrespective of load,
speed or conveyor length. A catenary is all that is
required for proper chain-sprocket interaction.
The catenary is a given length of chain which is left
unsupported in the return side of the conveyor. The
weight of this unsupported chains produces the
tension necessary to keep the chain wrapped on the
sprocket. Additionally, the catenary provides a place
for excess chain from elongation to accumulate.
The catenary should be directly after the drive or as
close as possible.
Rexnord never recommends chain take-up devices
except for the following cases:
adjustment of catenary sag to maintain proper
tension
unconventional conveyors where a catenary is
not practical (i.e. conveyors that are vertical or
tilted to the side, 90° from horizontal).
adjustment of shaft perpendicularity to maintain
proper chain tracking.
When a take-up or tensioning device is required to
keep a chain under constant tension Rexnord
recommends that a spring loaded or similar
tensioner be used.
Premature failure may result from an over
tensioned chain.
NOTE: The following equations relate
tension, excess chain, catenary sag and
catenary length.
Catenary Purpose and Design
T = B2 x W W x CS+ [ENGLISH]
96 CS 12
T = B2 x W W x CS+ [METRIC]
799 CS 102
CS = .375 BE [ENGLISH OR METRIC]
Where: CS = Catenary sag (inches or mm)
L = return strand length (inches or mm)
B = center distance (inches or mm)
E = excess chain, L - B (inches or mm)
Where: T = Chain tension due to catenary sag
(lbs/ft or N/m)
B = Center Distance (inches or mm)
W = Weight of chain (lbs/ft2 or kg/m2)
CS = Catenary sag (inches or mm)
SELECTION
PROCEDURE
cont.
Conveyor
Design and
Construction
cont.
Rex
®M
atTo
p®
Ch
ain
s
MT-9 Rex® Engineering Manual
Conveyor Design and Construction
CHAIN BACKFLEX RADII AND CATENARIES
Chain No. Min. Radius (mm)
591 2
21 00 1
1-1/2
1-1/2
4707 2
1-1/2
1
5966 1-1/2
1-1/2
5997 2-3/4
6085 2
TABLE 5 MINIMUM BACKFLEX RADIUS
Figure 21 Conveyors with up to 40' centers and top load up to 15 ft.
I
Figure 22 Conveyors with up to 60' centers and top load up to 20 ft.
I
Figure 23 Conveyors with longer than 60' centers and top load in excess of 20 ft.
ALTERNATE CATENARY ARRANGEMENTS
Incline Conveyors
Chain No. Min. Radius (mm)
2100
4705/5705
4706/5706
4707
5935/5936/6938
5966
5995/5996
5997
6085
1
1 - 1/2
1 - 1/2
2
1
1 - 1/2
1 - 1/2
2 -3/4
2
(25)
(38)
(38)
(51)
(25)
(38)
(38)
(70)
(51)
TABLE 5 MINIMUM BACKFLEX RADIUS Figure 22 Conveyors with up to 60' centers and top
load up to 20 lbs./sq ft.
Figure 21 Conveyors with up to 40' centers and top
load up to 15 lbs./sq ft.
Figure 23 Conveyors with longer than 60' centers
and top load in excess of 20 lbs./sq ft.
Incline Conveyors
Figure 24 Incline Conveyors
SPROCKETS
TAKE UP
2" - 5"
36" TO 48"
C S
PK
TL
(SPROCKET O.D.)2MIN.
C S
PK
TL
24" TO 36"
2" - 5"2" - 5"
C S
PK
TL
48" TO 60"(SPROCKET O.D.)2MIN.
SELECTION
PROCEDURE
cont.
Conveyor
Design and
Construction
cont.
Rex
®M
atTop
®C
hain
s
Rex® Engineering Manual MT-10
D
................ .................. .
Figure 25 Standard transfer plate mounting
TABLE 6 FLAT TRANSFER PLATE MOUNTING DIMENSIONS (PD = pitch diameter)
HEAD AND TAIL END CONSTRUCTION
dimensions
A
C
Transfer plate positioning - head and tail
Dimension "A" is the dimension from the
centerline of the sprocket to the top of the
wear track.
Dimension "B" is the dimension from the
centerline of the sprocket to the centerline of
the mounting holes for comb style transfer
plates. (See Page, 12 MatTop®).
Dimension "C" is the dimension from the
centerline of the sprocket to the end of the
supporting wear track.
Dimension "D" is the dimension from the
centerline of the sprocket to the top of the
transfer plate.
Chain No. A (mm) C* (mm) D (mm)
5935/5936
6938
6085
5995/5996
4705/4706/5966 5705/5706
2100
(PD) - 0.17 (4.3)
(PD) - 0.17 (4.3)
(PD) - 0.31 (7.9)
(PD) - 0.36 (9.1)
(PD) - 0.25 (6.4)
(PD) - 0.17 (4.3)
2
2
2
2
2
2
0.75 (19.1)
0.75 (19.1)
2.00 (50.8)
2.25 (57.2)
1.50 (38.1)
1.0 (25.4)
(PD) - 0.17 (4.3)
(PD) - 0.23 (6.0)
(PD) - 0.44 (11.1)
(PD) - 0.36 (9.1)
(PD) - 0.25 (6.4)
(PD) - 0.17 (4.3)
2
2
2
2
2
2
NOTE: TOLERANCES
A: -0, +1/32 (+0.80)
C: -0, +1/4 (+6.35)
D: -1/32 (-0.80), +0
*Above values good only for sprockets
mounted between support tracks. For
sprockets mounted in line with support
tracks:
C =O.D.
2( )2- (A-t) + 0.125
2
D
................ .................. .
Figure 25 Standard transfer plate mounting
TABLE 6 FLAT TRANSFER PLATE MOUNTING DIMENSIONS (PD = pitch diameter)
HEAD AND TAIL END CONSTRUCTION
dimensions
A
C
Transfer plate positioning - head and tail
Dimension "A" is the dimension from the
centerline of the sprocket to the top of the
wear track.
Dimension "B" is the dimension from the
centerline of the sprocket to the centerline of
the mounting holes for comb style transfer
plates. (See Page, 12 MatTop®).
Dimension "C" is the dimension from the
centerline of the sprocket to the end of the
supporting wear track.
Dimension "D" is the dimension from the
centerline of the sprocket to the top of the
transfer plate.
Chain No. A (mm) C* (mm) D (mm)
5935/5936
6938
6085
5995/5996
4705/4706/5966 5705/5706
2100
(PD) - 0.17 (4.3)
(PD) - 0.17 (4.3)
(PD) - 0.31 (7.9)
(PD) - 0.36 (9.1)
(PD) - 0.25 (6.4)
(PD) - 0.17 (4.3)
2
2
2
2
2
2
0.75 (19.1)
0.75 (19.1)
2.00 (50.8)
2.25 (57.2)
1.50 (38.1)
1.0 (25.4)
(PD) - 0.17 (4.3)
(PD) - 0.23 (6.0)
(PD) - 0.44 (11.1)
(PD) - 0.36 (9.1)
(PD) - 0.25 (6.4)
(PD) - 0.17 (4.3)
2
2
2
2
2
2
NOTE: TOLERANCES
A: -0, +1/32 (+0.80)
C: -0, +1/4 (+6.35)
D: -1/32 (-0.80), +0
*Above values good only for sprockets
mounted between support tracks. For
sprockets mounted in line with support
tracks:
C =O.D.
2( )2- (A-t) + 0.125
2
SELECTION
PROCEDURE
cont.
Conveyor
Design and
Construction
cont.
Rex
®M
atTo
p®
Ch
ain
s
MT-11 Rex® Engineering Manual
Chain No.
A
A B D T
D
Figure 26 Comb Transfer Plate Mounting Dimensions
Comb transfer plate
COMB TRANSFER PLATE MOUNTING
A = C/L OF SHAFT TO TOP OF WEAR STRIP
B = C/L OF SHAFT TO CENTER OF MOUNTING SLOT
C = C/L OF SHAFT TO BEGINNING OF WEAR STRIP
D = C/L OF SHAFT TO TOP OF TRANSFER PLATE
T = THICKNESS OF TRANSFER PLATE
T
C
4707
5997
(PD) - 0.25 (6.4)
(PD) - 0.36 (9.1)
2
2
3.25 (82.6)
3.25 (82.6)
1.50 (38.1)
2.25 (57.2)
(PD) - 0.50 (12.7)
(PD) - 0.61 (15.5)
2
2
0.25 (6.4)
0.25 (6.4)
TABLE 7 COMB TRANSFER PLATE MOUNTING DIMENSIONS
NOTE: TOLERANCES
A: -0, +1/32 (+0.80)
C: -0, +1/4 (+6.35)
D: -1/32 (-0.80), +0
NOTE: "B" dimension is flexible. One must
insure that comb figures extend beyond
sprocket centerline to avoid transfer problems.
* Mounting sprockets in line with
wear strips is not recommended for
chains using comb transfer plates.
C B
SELECTION
PROCEDURE
cont.
Conveyor
Design and
Construction
cont.
Rex
®M
atTop
®C
hain
s
Rex® Engineering Manual MT-12
STEP 2
Low Temperature Application
Chain Contraction Expected
Figure 27 Comb Transfer Plate Mounting (Low Temperature)
1. Secure the 2 center most transfer plates
as shown.2. Position fasteners in the remaining
transfer plates to the corresponding right
side or left side of the slots to allow for
contraction at low temperatures.
High Temperature Application
Chain Expansion Expected
Figure 28 Comb Transfer Plate Mounting (High Temperature)
1. Secure the 2 center most transfer plates
as shown. These will track the chain.
2. On transfer plates to the left of center,
position fasteners to the left side of the
slot. On the right hand transfer plates,
position fasteners to the right side of the
slot. This arrangement will allow these
transfer plates to move as required to
accommodate changes in chain width
up to 1 - 1.2" (38.1)
For Room Temperature Applications
1. Secure the 2 center most transfer plates
as shown above.2. The transfer plates to the left and right
should have fasteners centered in the
mounting slots.
SELECTION
PROCEDURE
cont.
Conveyor
Design and
Construction
cont.
Rex
®M
atTo
p®
Ch
ain
s
MT-13 Rex® Engineering Manual
I I
I
I I
DRIVE
SUPPORT IDLER ROLLERS
CATENARY
ROLLER
BI-DIRECTIONAL CONVEYORS
Figure 29 End Drive Conveyor
The following examples show two methods
of driving a bi-directional conveyor with one drive.
SpanInches(mm)
Sag Inches (mm)
IDLER ROLLER
SPAN
SAG
10 (250)
20 (500)
30 (750)
40 (1000)
50 (1250)
60 (1500)
70 (1750)
80 (2000)
90 (2250)
100 (2500)
110 (2750)
120 (3000)
0.6 (1,77)
1.6 4,81)
3.4 (10,20)
5.8 (17,40)
8.9 (26,70)
12.8 (38,30)
17.3 (52,00)
22.5 (67,70)
28.4 (85,30)
35.0 (105,00)
42.3 (127,00)
50.3 (151,00)
0.6 (1,77)
1.4 (4,22)
2.7 (10,20)
4.5 (13,40)
6.8 (20,40)
9.7 (29,00)
13.1 (39,20)
17.0 (50,80)
21.4 (64,10)
26.4 (79,10)
31.8 (95,20)
37.8 (113,00)
0.6 (1,77)
1.3 (3,92)
2.3 (6,90)
3.8 (11,40)
5.6 (16,80)
7.9 (23,60)
10.6 (31,70)
13.8 (41,30)
17.3 (51,80)
21.3 (63,80)
25.6 (76,60)
30.4 (91,20)
0.7 (2,06)
1.2 3,63)
2.1 (6,30)
3.3 (9,90)
4.8 (14,30)
6.8 (20,40)
9.0 (27,00)
11.6 (34,70)
14.6 (43,80)
17.9 (53,60)
21.5 (64,40)
25.5 (76,30)
0.7 (2,06)
1.2 (3,63)
1.9 (5,70)
3.0 (9,00)
4.3 (12,90)
5.9 (17,70)
7.9 (23,60)
10.1 (30,20)
12.6 (37,80)
15.5 (46,40)
18.6 (55,70)
22.0 (65,80)
0.8 (2,35)
1.2 (3,63)
1.8 (5,40)
2.8 (8,30)
3.9 (11,70)
5.4 (16,20)
7.0 (21,00)
9.0 (27,00)
11.2 (33,60)
13.7 (41,00)
16.4 (49,10)
19.4 (58,10)
0.9 (2,65)
1.2 (3,63)
1.8 (5,40)
2.6 (7,70)
3.6 (10,80)
4.9 (14,70)
6.4 (19,10)
8.2 (24,50)
10.1 (30,20)
12.3 (36,80)
14.8 (44,30)
17.4 (52,00)
0.9 (2,65)
1.3 (3,92)
1.8 (5,40)
2.5 (7,50)
3.4 (10,20)
4.6 (13,70)
5.9 (17,70)
7.5 (22,50)
9.3 (27,90)
11.3 (33,80)
13.4 (40,10)
15.8 (47,40)
1.1 (3,34)
1.3 (3,92)
1.8 (5,40)
2.4 (7,20)
3.2 (9,60)
4.1 (12,30)
5.3 (15,90)
6.6 (19,70)
8.0 (23,90)
9.7 (29,00)
11.5 (34,40)
13.5 (40,40)
3.0 (75) 4.0 (100) 5.0 (125) 6.0 (150) 7.0 (175) 8.0 (200) 9.0 (225) 10.0 (250) 12.0 (300)
TABLE 8 - (T) CATENARY TENSION - POUNDS (NEWTONS) FOR CHAIN WEIGHINGONE POUND PER FOOT2 (OR ONE KILOGRAM PER METER2)
The end drive method is recommended for light duty service
(10'-20' centers) on conveyors where the chain tension on
the carry side can be balanced by the catenary tension. Use
Table 8 to calculate catenary tension "T". This tension must
be equal to, within 5%, the carry side chain tension for proper
operation.
In addition, when calculating chain tension per foot of width,
use twice the calculated carry side chain tension to
determine chain load carrying capability. This is adjusted
chain tension. This is to allow for chain tension in the
catenary section, that is equal to carry side chain tension.
For determining horsepower, use standard tension, (CT).
Example:
Conveyor length = 12 ft.; top load - 11 lb./ft.2,
chain = LF5997 @ 3.4 lb./ft.2; calculated chain
tension = 43 lb./ft. of width. Therefore, catenary
tension (T), should equal 43 lbs. "T", from Table
8, is multiplied by the chain weight to determine
span length and depth required. The minimum "T"
from Table 8 required to get 43 lb. tension is 12.8,
(12.8 x 3.4 = 43.5).
This corresponds to a 60" span and a 3" sag. Other
combinations are possible.
For applications beyond the capacity of the end
drive method, use the bottom drive arrangement.
SELECTION
PROCEDURE
cont.
Conveyor
Design and
Construction
cont.
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Rex® Engineering Manual MT-14
IDLER ROLLER
DRIVE BOTTOM
BI-DIRECTIONAL CONVEYORS, CONT.
SUPPORT ROLLERS
2' - 3' (0.51M) spacing, depending on speed and other
considerations.
IDLER ROLLERS
The idler rollers can be continuous drums or a series
of individual rollers. However, if individual rollers are
used, they should be positioned in the same location
as the drive sprockets. Note that on each shaft, each
drive sprocket requires a roller.
Bottom Drive Conveyor
(For heavy-duty service)
Figure 30 Bottom Drive Conveyor
BOTTOM DRIVE
All sprockets must be keyed in-line.
END TERMINALS
For single strand, continuous width conveyors, key at
least two sprockets, preferably the outer most
sprockets.
For conveyors using multiple strands of chain, key the
sprockets for one of the strands only - preferably the
center strand.
Sprocket Requirements and Location
4705/4706/4707 AND
5705/5706 CHAINS
Use (2) sprockets per foot (7 per meter) of chain width.
If the operating chain tension exceeds 80% of its rated
capacity use (4) sprockets per foot (13 per meter) of
chain width.
5935, 5936, 2100, AND 6938 CHAINS
Use (4) sprockets per foot (13 per meter) of chain
width for loads up to 50% of chain capacity and (6) per
foot (20 per meter) for loading in the 50% - 75%
capacity range.
Loading of more than 75% of the chain's capacity
requires (8) sprockets per foot (26 per meter) of chain
width.
5966, 5995, AND 5996 CHAINS
Use (2) sprockets per foot (7 per meter) of chain width
up to 50% of chain capacity.
Greater than 50% loading requires (4) sprockets per
foot (13 per meter) of chain width.
6085 CHAIN
Use (3) sprockets per foot (10 per meter) of chain
width.
5997 CHAIN
It is very important to use (4) sprockets per foot (13 per
meter) since less sprockets might cause the chain to
sag between sprockets and cause the transfer combs
to be exposed to the transferring product. If transfer
combs are not being used, follow the
recommendations for 5996 chain.
NOTE: Make sure 6938 and 2100 are set up so drive and idle sprockets do not
contact open barrels ("stagger" spkts on 6938).
END TERMINAL END TERMINAL
SELECTION
PROCEDURE
cont.
Bottom
Drive
Conveyor
Sprocket
Requirements
and Location
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MT-15 Rex® Engineering Manual
SPROCKET SPROCKET WIDTH
I
I I 3 '
I
I I I
12' WIDTH
and Sprockets
I
Sprocket Locations
4700 Chains and 5700 Assembled to Width Chains
820 and NS820 Sprockets
820 and N820 Double Groove Sprockets
N4700 and N5700 Sprockets
Figure 32
Figure 33
Figure 31
For molded-to-width sizes or chains not shown, contact Rexnord.
2-1/22-1/2
C/L 820
SPROCKETC/L 820
SPROCKET12" WIDTH
3 3
12" WIDTH
C/L 820 DOUBLE
SPROCKETC/L 820 DOUBLE
SPROCKET
12" WIDTH
C/L SPROCKET
4700C/L SPROCKET
4700
3 3
SELECTION
PROCEDURE
cont.
Sprocket
Requirements
and Location
cont.
Rex
®M
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Rex® Engineering Manual MT-16
I SPROCKET POCKET SPROCKET
3-112 1-114
I ! ! ! ! I
SPROCKET POCKET I
5900 Chains
Figure 34
Figure 35
Figure 36
5935 and 5936 Chains
5966 and 5995 Chains
5996 and 5997 Chains
3/4 1-1/2 1-1/2 1-1/2 1-1/2 1-1/2 1-1/2 1-1/2 3/4
C/L SPROCKET
12" WIDTH
12" WIDTH
1-1/2 3 3 3 1-1/2
C/L SPROCKET
POCKETC/L SPROCKET
1-1/4 3-1/2 2-1/2 3-1/2 1-1/4
C/L SPROCKET
12" WIDTH
SELECTION
PROCEDURE
cont.
Sprocket
Requirements
and Location
cont.
Rex
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MT-17 Rex® Engineering Manual
ROUND BORE SPROCKETS
Figure 37
Figure 38
SQUARE AND HEX BORE SPROCKETS
Use round bore sprockets on conveyors
operating at room temperature. When
installing the sprockets, make sure that all
sprocket faces are positioned the same way
on the shaft, with identification marks all
facing the same direction, as shown above.
After positioning all sprockets in line with
sprocket tooth pockets in the chain, secure
the sprockets with set screws. (Also see
general note below).
Use square or hex bore sprockets on
conveyors intended for use at elevated or
lower temperatures (warmers, pasteurizers,
coolers, etc.). When installing the sprockets
make sure that all sprocket faces are
positioned the same way on the shaft, with
identification marks all facing the same
direction , as shown. Also, be sure to align
the notched teeth for proper timing.
GENERAL NOTE: It is generally recommended to lock center sprocket(s) to shaft
using set screws or set collars. The other sprockets should be allowed to "float" axially.
SELECTION
PROCEDURE
cont.
Sprocket
Installation
Rex
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Rex® Engineering Manual MT-18
MATTOP® NOMINAL AND ACTUAL WIDTHS
NOMINAL WIDTH NOMINAL WIDTH
12" 24" 36" 48" 60" 12" 24" 36" 48" 60"
4705 4705ACTUAL WIDTH INCHES ACTUAL WIDTH MILLIMETERS
LF
HT
LT
LF
HT
LT
11 15/16
11 31/32
11 15/16
23 29/32
23 29/32
23 29/32
35 27/32
35 7/8
35 27/32
47 13/16
47 13/16
47 13/16
59 3/4
59 25/32
59 3/4
303.2
303.9
303.2
607.2
607.2
607.2
910.4
911.2
910.4
1214.4
1214.4
1214.4
1517.7
1518.4
1517.7
4706 4706ACTUAL WIDTH INCHES ACTUAL WIDTH MILLIMETERS
LF
HT
LT
LF
HT
LT
11 15/16
11 31/32
11 15/16
23 29/32
23 15/16
23 29/32
35 27/32
35 15/16
35 27/32
47 25/32
47 29/32
47 25/32
59 23/32
59 27/32
59 23/32
303.2
303.9
303.2
607.2
607.9
607.2
910.4
912.8
910.4
1213.6
1216.8
1213.6
1516.8
1520.0
1516.8
5935 5935ACTUAL WIDTH INCHES ACTUAL WIDTH MILLIMETERS
LF
HT
LF
HT
11 15/16
11 15/16
23 27/32
23 7/8
35 25/32
35 13/16
47 23/32
47 3/4
59 21/32
59 11/16
303.2
303.2
605.6
606.4
908.8
909.6
1212.0
1212.8
1515.3
1516.0
5936 5936ACTUAL WIDTH INCHES ACTUAL WIDTH MILLIMETERS
LF
HT
LF
HT
11 31/32
11 15/16
23 15/16
23 7/8
35 29/32
35 13/16
47 7/8
47 3/4
59 27/32
59 11/16
303.9
303.2
607.9
606.4
912.0
909.6
1216.0
1212.8
1520.0
1516.0
5966 5966ACTUAL WIDTH INCHES ACTUAL WIDTH MILLIMETERS
LF
HT
LT
LF
HT
LT
11 31/32
11 31/32
11 31/32
23 31/32
23 15/16
23 29/32
35 15/16
35 27/32
35 7/8
47 29/32
47 27/32
47 13/16
59 27/32
59 27/32
59 25/32
303.9
303.9
303.9
608.8
607.9
607.2
912.8
910.4
911.2
1216.8
1215.2
1214.4
1520.0
1520.0
1518.4
5995 5995ACTUAL WIDTH INCHES ACTUAL WIDTH MILLIMETERS
WSM
LT
WSM
LT
12 1/32
12 1/32
24 1/16
24 1/16
36 3/32
36 3/32
47 1/8
47 1/8
60 5/32
60 5/32
305.6
305.6
611.2
611.2
916.8
916.8
1222.4
1222.4
1527.9
1527.9
5996 5996ACTUAL WIDTH INCHES ACTUAL WIDTH MILLIMETERS
LF
HT
LT
LF
HT
LT
11 31/32
11 15/16
11 15/16
23 29/32
23 29/32
23 29/32
35 7/8
35 27/32
35 27/32
47 13/16
47 13/16
47 13/16
59 25/32
59 3/4
59 3/4
303.9
303.2
303.2
607.2
607.2
607.2
911.2
910.4
910.4
1214.4
1214.4
1214.4
1518.4
1517.7
1517.7
NOMINAL WIDTH NOMINAL WIDTH
48" 60" 72" 84" 96"
5997 5997ACTUAL WIDTH INCHES ACTUAL WIDTH MILLIMETERS
LF
HT
LT
LF
HT
LT
47 3/4
47 7/8
47 29/32
59 11/16
59 27/32
59 7/8
71 5/8
71 13/16
71 27/32
83 9/16
83 25/32
83 13/16
95 1/2
95 3/4
95 13/16
1212.9
1216.0
1216.8
1516.0
1520.0
1520.8
1819.3
1824.0
1824.8
2122.5
2128.0
2128.8
2425.7
2432.0
2433.6
48" 60" 72" 84" 96"
TOLERANCES on all above actual widths +/-1/32" (0.8 mm).
For chain widths less thank 12", use nominal width +/-1/32" (0.8 mm).
5705 and 5706 chains are the same as 4705 and 4706 respectively.
For molded-to-width sizes or chains not shown, contact Rexnord.
WIDTHS
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MT-19 Rex® Engineering Manual
CHAIN INSTALLATION AND REPLACEMENT
MatTop® chains are typically supplied in
10 foot lengths with connecting pins for
each strand. Before connecting strands,
use one strand to check for proper guide
clearance and sprocket alignment.
Lay each section in the conveyor track and
couple.
1. Push the pin through the link using a
3/16" or 1/4" diameter drift until the
opposite end can be gripped and pulled
through the remaining links.
2. Replace links as required and replace all
pins that were removed with new pins.
3. Using a soldering iron to form a pin head
so that the head is recessed in the end of
the link. (A special "tip" for standard
soldering irons is available from Rexnord.
Contact your sales representative or
distributor for details.
Rexnord provides the soldering iron tips at
a nominal cost. A 40 watt to 80 watt
soldering iron is recommended.
Contact MatTop® Customer Service for
pricing and delivery.
Installation
and
Replacement
Installation
4700 and 5900
Series
Replacement
4700 Series
Rex
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Rex® Engineering Manual MT-20
Rexnord has pin extracting tools available
for disassembling 5900 series chains. Also,
standard sheet metal or wood screws may
be used.
Contact MatTop® Customer Service for
pricing and delivery.
A chain assembly tool is also available
from Rexnord. This device will help pull
chain together during final assembly when
the last pin in inserted. The assembly tool
works with 4706, 5996, and 5997 chains.
Contact MatTop® Customer Service for
pricing and delivery.
1. Pry pin lock insert out
with screwdriver.
2. Turn the screw starter
(sheet metal screw, etc.)
into plastic pin.
3. Pull out plastic pin.
Remove or add links as
needed. Reinstall pin and
pin lock insert.
Replacement
5900 Series
Tools
Rex
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MT-21 Rex® Engineering Manual
Rex® Multiflex Engineering
Manual
RUN STRAIGHT RUN
The figure at right shows a typical straight section of conveyor.
Note that the conveyor frame is designed to support the chain on
the bottom of the link. The wear strip spacing is varied to
distribute the wear evenly across the bottom of the link. This
open design is preferred over full width support since it prevents
the build-up of debris in the track. For dry abrasive conditions
use steel wear strips. For wet abrasive conditions use stainless
steel wear strips. For non-abrasive conditions use UHMWPE or
Nylatron®.
The chain is fully supported at all points in the conveyor. The
chain is guided by two side members as shown in Section A-A.
Chain guides are of such a height that they would not interfere
with a product that may overhang the sides of the chain.
Very wide products can be handled on this chain through proper
product guide rail spacing and design (guide rails not shown in
Section A-A).
CORNER SECTIONS
The corner discs guide the chain around the corner. Corner turn
discs are used to guide the chain without significant increase in
chain tension. For curves of 15° or less, it is possible to use a
conventional stationary curve (wear strip). (For 1701, 1702, 1701
TAB, and 2500 chains stationary (sliding) curves can be used for
any corner turn.)
The chain supporting members, chain guides, and product guide
rails for corners are similar to those used in the straight sections.
The corner sections of the conveyor provide full chain support.
The corner discs are positioned in such a manner that the chain,
while being engaged with the disc, is also being supported by the
wear strips.
The chain guides are provided on the outside of the curve while
the corner turn disc provides guidance on the inside of the curve.
It is very important to have the chain enter and leave the
disc in the same plane as the disc. This is necessary to
maintain the chain on the disc.
29/32" MIN.
(58 mm)
25/ 3
2"
(20 m
m)
CHAIN
GUIDE
MA
X.
CHAIN WEAR STRIP
SECTION A - A (WITH CHAIN IN POSITION)
Note-1700 chain is shown in the illustrations in this section (Multi-flex section-Pages 1-8).
Most of the information can also ve used for 1755, 1701, 1702, 1701 TAB and 2500.
CHAIN GUIDES 1/2" (12.7mm)
Recommended minimum spacing to preventwear on pivot which mighteffect sprocket action.
CHAIN WEAR STRIPS
A
A Typical Straight Run Conveyor - Top View
*7116" (179.5mm) radius to
inside of chain guide (1700 chain only)
CHAIN WEAR STRIP
CORNER DISC
CHAIN
GUIDE
*For Large Turn Disc "L" Dimensions = 10",
radius will be 11.16" (283.5mm).
Typical Corner Section
with Chain in Position
MULTIFLEX
CHAIN
ENGINEERING
TYPICAL
CONVEYOR
CONSTRUCTION
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MF-1 Rex® Engineering Manual
This
As illustrated earlier, the Rex® Multiflex chains are ideally suited
for use on multi-incline conveyors. To assure proper functioning
of these conveyors it is important:
1. That the chain enters and leaves the disc in the same plane as
the disc.
2. That any change in the angle of chain travel should occur
through downflexing of the chain - not backflexing.
Maximum incline angle for Multiflex chains should not exceed 1
1/4 inches per foot (104.2 millimeters per meter). The actual
angle of incline for an application depends on product stability
and product - chain coefficient of friction.
MULTI-INCLINE CONVEYORS
WHEN INCLINING, the chain must pass through a
transition zone prior to entering the disc. The disc
should be tipped so that it lies in the same plane as the
leaving chain. Also, provide for minimum spacing, D, for
the entering chain.
WHEN DECLINING, the chain must pass through a
transition zone only after it has left the disc. The disc
should be tipped to lie in the same plane as the entering
chain. Also, provide for minimum spacing, D, for the
leaving chain.
Note: In the transition zone, the wear strips should be
curved to accomplish smooth transition from one plane
of conveying to the next.
CORNER
DISC
CL
D
Not ThisAny change in angle of chain travel should
be made by downflexing the chain as
shown. Backflexing through a change in
angle will cause the chain to rise out of the
conveyor frame.
Chain BackflexingChain Downflexing
TRAVEL ENTERING
TRAVEL
LEAVING
CLCORNER
DISC
MIN. = 0.3 OF DISC DIAMETER
(0.5 FOR WIDE PRODUCTS)
D
TRANSITION
ZONE
(See Note)
Side View of Incline Conveyor at Corner Disc
Side View of Decline Conveyor at Corner Disc
TRAVEL ENTERING
TRANSITION
ZONE
(See Note)
MIN. = 0.3 OF DISC DIAMETER
(0.5 FOR WIDE PRODUCTS)
TRAVEL
LEAVING
CORNER
DISC
D
MULTIFLEX
CHAIN
ENGINEERING
TYPICAL
CONVEYOR
CONSTRUCTION
Rex
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Rex® Engineering Manual MF-2
* This arrangement can be part of an intermediate drive, which allows a single strand of chain to be used. See Page (TableTop®, 10).
PRODUCT TRANSFERS
Chain downstream should be at the same height of slightly lower
(1/32") than chain upstream to prevent product tippage.
By using simple switching devices at different transfers, Multiflex
Chain can be further utilized to continuously distribute products
to different points in the plant.
The flexibility of Multiflex chains permits the use of several types
of transfer.
1 FT.
Recommended
Minimum
1 FT.
Recommended
Minimum
Side Transfer Where Product*
Moves in Straight LineSide Transfer Where Product*
Moves Laterally from Chain to Chain
1 FT.
Recommended
Minimum
Cross Transfer Where Product
Can Flow Straight fro Chain to Chain
or Remain on Same Chain
Using Switches
Corner Transfer Where Product
Can be Transferred from
Corner to Conveyor
or Remain on Same Chain
Using Switches
SWITCHING
DEVICE
MULTIFLEX
CHAIN
ENGINEERING
TYPICAL
CONVEYOR
CONSTRUCTION
Rex
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Rex
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MF-3 Rex® Engineering Manual
CHAIN RETURNS
A great variety of chain returns are possible with Rex® Multiflex
chains. This variety of returns offers considerable conveyor
design freedom.
The best type of return for a specific case depends on the
conveyor configuration and other application considerations
(product flow, available space, etc.).
Note 1: The CORNER TURN DISC in the return section is
mounted in the same manner as in the carry section: the return
disc is not* mounted upside-down. The top of the disc should be
even with the bottom of the upside-down chain.
Note 2: IDLER WHEELS are recommended for tail wheels, not
sprockets. If the idler wheel does not have a flange to contain the
chain, then the conveyor frame must have a "skirt" to track the
chain on the wheel.
CONVENTIONAL CONVEYORS
If the Multiflex chain is used to convey in one plane, a
conventional return might be used as shown.
IDLER
WHEEL
FOR TAIL
WHEEL
(See Note 2)
For Mounting
details, see Page 8
Multiflex.
NOTE: RETURN CHAIN FOLLOWS
SAME PATH AS CARRYING
CHAIN ON CONVEYOR.
Page 6, Multiflex.
CORNER DISCS
(See Note 1)
IDLER
WHEEL
FOR LEAD-IN
TO RETURN
SUPPORT
DRIVE SPROCKET**
For mounting
details, see Page 8
Multiflex.
CONVENTIONAL
CATENARY,
See Page 7 TableTop®
*1701 is an exception. Return disc is mounted upside down. (Applies to bevel style chain only).
**For intermediate drive arrangement see Page 10, TableTop®.
MULTIFLEX
CHAIN
ENGINEERING
TYPICAL
CONVEYOR
CONSTRUCTION
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Rex® Engineering Manual MF-4
CHAIN RETURNS (Continued)
ELEVATING CONVEYORS
DRIVE SPROCKET*
CORNER DISCS
Sideflexing Return on Typical Elevator
'For Intermediate arrangement see Page 10, TableTop®.
NOTE:
CHAIN IS IN
CARRYING
POSITION
DRIVE
SPROCKET*
For mounting
details, See
Page 8,
Multiflex.
FREE-
HANGING
RETURN
TRAVEL IDLER
WHEEL
(TAIL WHEEL)
For mounting
details, See
Page 8,
Multiflex.
FOR
PROPER
CATENARY
See Page 7,
Multiflex.
drive
Rex® Multiflex chains have the ability to elevate or
lower products in a very compact area. This figure
shows a typical elevating system and how the chain is
being returned on such a unit. Note that the chain
hangs straight down from the drive sprocket and side
flexes back up into the tail section (there is no sliding
return). Elevators can also be designed with combined
free-hanging (catenary sag) returns and sliding returns.
MULTIFLEX
CHAIN
ENGINEERING
TYPICAL
CONVEYOR
CONSTRUCTION
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MF-5 Rex® Engineering Manual
CHAIN RETURNS
(Continued)
CARRY CARRY
Straight Run Corner Section
RETURN RETURN (See Page Note 1)
For supported returns on conventional or elevating conveyors,
sliding returns are recommended, not roller returns.
The straight corner section design for the sliding return can be
the same as for the carry section. The chain is simply run in the
conveyor upside down through the return section.
4, Multiflex
MULTIFLEX
CHAIN
ENGINEERING
TYPICAL
CONVEYOR
CONSTRUCTION
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Rex® Engineering Manual MF-6
CHAIN RETURNS (Continued)
CATENARY SAG
(For elevating and lowering only. For conventional
conveyors see Page 7, TableTop®).
Two considerations in return design are:
Elevating System
HEAD
1. Provide a minimum of 90° wrap on the head sprocket.
2. Provide required chain tension through controlled catenary
sag in the return strand to balance unabsorbed chain tension.
SHAFT
TAIL SHAFT-
Recommended Chain Length in Catenary for 90 Wrap on Sprockets
Catenary Length
(Feet)
Metric
Catenary Length (Meters) Headshaft Headshaft
Chain Chain
Tension (LBS)
Tension 1700
1701
1702 (Newtons)
DEFINITION OF CATENARY LENGTH
Lowering System
.TAIL SHAFT
HEAD
CATENARY
LENGTH
ALTERNATE CATENARY ARRANGEMENTS
If the recommended length of chain in the catenary cannot
be maintained (because of space limitations, etc.) increase
the chain wrap to by use of an idler wheel as shown.
With an idler wheel arrangement, the catenary chain length
only needs to be of that listed in the above table.
Head Sprocket With an Wheel
multiflex
important
SHAFT
CA
TE
NA
RY
LE
NG
TH
17551700
1701
1702
1755
1
1.5
2.5
3.0
4.5
6.0
7.0
2
4
6
-
-
-
-
50
100
150
200
300
400
500
0.4
0.6
0.7
1.0
1.5
2.0
2.3
0.8
1.6
2.0
-
-
-
-
250
450
650
900
1500
1800
2200
120°
1/4
TRAVEL
HEAD
SPROCKET
120°WRAP
IDLERWHEEL
Idler
MULTIFLEX
CHAIN
ENGINEERING
TYPICAL
CONVEYOR
CONSTRUCTION
Rex
®M
ult
ifle
x C
hai
ns
MF-7 Rex® Engineering Manual
SPROCKET AND WEAR STRIP POSITIONING
For Multiflex Chains Only
Chain
Multiflex
Wheel Diameter
B C
Chains
1701, 1702
1755
2500
A=
1.968"
1.575"
3.0"
Only:
B values same as above
LOCATION AND POSITIONING
STRIP
TOP OF AR STRIP
\
TOP OF WEAR STRIP
IDLER WHEEL
A = (Pitch Diameter) - C
2
WEAR STRIP
B
A +1/32 -0
(50mm)
(40mm)
(76mm)
15/32"
1/4"
45/64"
2TOP OF WEAR STRIP
WEAR STRIP
B
A +1/32 -0
MULTIFLEX
CHAIN
ENGINEERING
SPROCKET &
IDLER
POSITIONING
Rex
®M
ultiflex C
hain
s
Rex® Engineering Manual MF-8
Lubrication Chain Material Condition
Acetal
Wear strip Material
Carbon and UHMWP and
Stainless Steel Nylatron
Dry
Water
Soap & Water
Oil
LF Acetal
Product Material
Carbon Steel and S tainless
Steel
Plastic
[Including PET)
Paper
Lubrication
Condition
Steel
LF Acetal HP Acetal Carbon Steel
Aluminum
Glass
Returnable
Glass Bottles
Non-Returnable
Glass B ottles
Chain Type And Material
Note: for LBP chains (typically) = 0.07
HP Acetal
Dry
Water
Soap & Water
Oil
Dry
Water
Soap & Water
Oil
Water
Soap & Water
Oil
0.30
0.23
0.15
0.10
0.25
0.21
0.15
0.10
0.25
0.20
0.15
0.10
0.20
0.18
0.15
0.10
0.22
0.20
0.15
0.10
0.18
0.16
0.14
0.10
0.50
0.40
0.20
0.20
0.40
0.30
0.20
0.20
Friction Factors Between Chain and Wearstrips (Fw)
Friction Factors Between Product and Wearstrips (Fm)
D AcetalStainless
Steel
Dry
Water
Soap & Water
Dry
Dry
Water
Soap & Water
Oil
Dry
Water
Soap & Water
Dry
Water
Soap & Water
Dry
Water
Soap & Water
Dry
Water
Soap & Water
0.25
0.20
0.15
0.33
0.30
0.22
0.15
0.10
0.25
0.17
0.12
0.20
0.15
0.10
0.27
0.18
0.14
0.20
0.15
0.10
0.20
0.18
0.15
0.30
0.25
0.20
0.15
0.10
0.20
0.15
0.12
0.15
0.13
0.10
0.20
0.16
0.14
0.15
0.13
0.10
0.18
0.16
0.14
0.25
0.18
0.16
0.13
0.10
0.18
0.14
0.12
0.14
0.12
0.10
0.18
0.16
0.14
0.13
0.11
0.10
0.30
0.20
0.10
0.40
0.35
0.25
0.15
0.15
0.28
0.19
0.12
0.35
0.25
0.15
0.47
0.31
0.21
0.35
0.25
0.15
0.30
0.20
0.10
0.40
0.35
0.25
0.15
0.15
0.28
0.19
0.12
0.35
0.25
0.15
0.47
0.31
0.21
0.35
0.25
0.15
FM
MULTIFLEX
CHAIN
ENGINEERING
STRAIGHT
RUNNING
CHAINS
Rex
®M
ult
ifle
x C
hai
ns
MF-9 Rex® Engineering Manual
Conveyor
Section
1
2
(CASE B)
EXAMPLE 1 :
CONVENTIONAL CONVEYOR
PARAMETERS:
Chain Weight = 1 0 Lb /Ft. (1701 TAB)
Product Weight = 5
= 0.25
fm =
25 Ft. Slippage from Head Sprocket
20 1.0 0.25 5.0 5.8
30 1.0 0.25 7.5
Speed = 120 FPM
= 5 Per Hour
PLF = 1.5
SECTION #4
3
4
30 6.0 0.25 45 .0 5 5.0 0.18 4.5 62 .8 1.15 72 .2
20 6.0 0.25 30 .0 102 .2 20 5.0 0.18 18.0
6
TA = CT x PLF
= 180.3 Lbs.
Where
TA = Tension. Adjusted
CT = Chain Tension
RETURNSUPPORTIDLER
SECTION #2
SECTION #1
20"
SECTION #3
30"
IDLERWHEEL
DRIVESPROCKET
CORNERDISCS
Lb /Ft.
fw
0.18
Stop-Start
5.0 + 0 1.15
13.3
"L"
Section
Length
(Ft.)
"W"
Chain
Weight
(Lbs./Ft.)
"fw"
Coefficient
of Friction
Chain
Tension
(Lbs.)
1 x 2 x 3
Chain
Tension
into The
Turn
(Lbs.)
4 + Prev 7
Turn Factor
(TF) 1.15
TF Used
For The Section
(Lbs.)
5 x 6
No TF Used
For The Section
(Lbs.)
4 + Prev 7
Chain Tension
Slip-4
Slip-3
1 2 3 4 5 6 7
Tr = Tension in Return Section
Tc + Ts = Tension in Carry Section + Slippage
120.2 (CT)
58.3
1 2 3 4 5 6 7
Conveyor
Section
"L"
Section
Length
(Ft.)
"W + M"
Chain +
Product
Weight
(Lbs./Ft.)*
"fw"
Coefficient
of Friction**
Chain
Tension
(Lbs.)
1 x 2 x 3
Chain
Tension
into The
Turn
(Lbs.)
4 + Prev 7
Turn Factor
(TF) 1.15
TF Used
For The Section
(Lbs.)
5 x 6
No TF Used
For The Section
(Lbs.)
4 + Prev 7
Chain Tension
* For "Slip", only use "M"
** For "Slip" use "fm"
120.5 x 1.5
CALCULATION
OF CHAIN
TENSION FOR
MULTIFLEX
CHAINS
Rex
®M
ultiflex C
hain
s
Rex® Engineering Manual MF-10
DRIVE SPROCKET
SECTION #8
(CASE C)
EXAMPLE 2:
ELEVATOR
PARAMETERS:
Chain Weight W = 0.85 Lb./Ft/ (1700)
Product Weight M = 7 Lb./Ft.
fw = 0.25, fm - 0.18
Sections 3 through 8
are inclined at 3/4 "/Ft.
fw (incline) = 0.25 x Ks
= 0.25 x 1.25 = 0.31
25 Feet of Slippage from
Headshaft
Speed = 80 FPM
Stop-Start = Continuous Run
PLF = 1.0
DRIVE SPROCKET
TR
AV
EL
SECTION #4
SECTION #1
RETURNSUPPORT IDLER
SECTION #5
SECTION #6
SECTION #2
SECTION #9
SECTI
ON #
3
SECTION #
7
10'
13'
13'
3'
Conveyor
Section
1
2
3
4
5
6
7
Slip-7
8
Slip-8
9
Slip-9
TA = CT x PLF
= 404.0 Lbs.
Where
TA = Tension. Adjusted
CT = Chain Tension
"L"
Section
Length
(Ft.)
"W + M"
Chain +
Product
Weight
(Lbs./Ft.)
"fw"
Coefficient
of Friction
Chain
Tension
(Lbs.)
1 x 2 x 3
Chain
Tension
into The
Turn
(Lbs.)
4 + Prev 7
Turn Factor
(TF) 1.15
TF Used
For The Section
(Lbs.)
5 x 6
No TF Used
For The Section
(Lbs.)
4 + Prev 7
Chain Tension
1 2 3 4 5 6 7
* For "Slip", only use "M"
** For "Slip" use "fm"
404.0 x 1.0
13
3
10
10
10
10
10
2
10
10
13
13
7.85
7.85
7.85
7.85
7.85
7.85
7.85
7.0
7.85
7.0
7.85
7.0
0.25
0.25
0.31
0.31
0.31
0.31
0.31
0.18
0.31
0.18
0.31
0.18
25.5
5.9
24.3
24.3
24.3
24.3
24.3
2.5
24.3
12.6
31.6
16.4
-
35.2
64.8
98.8
137.9
182.9
234.6
237.1
297.0
309.6
-
404.0
1.15
1.15
1.15
1.15
1.15
1.15
-
1.15
-
1.15
-
-
29.3
40.5
74.5
113.6
158.6
210.3
-
272.7
-
356.0
-
-
-
-
-
-
-
-
234.6
-
297.0
-
387.6
404.0 (CT)
MULTIFLEX
CHAIN
ENGINEERING
Rex
®M
ult
ifle
x C
hai
ns
MF-11 Rex® Engineering Manual
Minimum Chain and Wear Strip
Acetal and LF Acetal - 40
Nylon - 40
- 100
Steel - 40
Lubricant impregnated wood - 50
UHMWPE
ABRASION Presence of broken glass metal fines paint
chips. etc
Maximum Temperature
170 150
800 250*
350 250*
160 160
(250) 180 (250) 160
If such abrasives are present chain-wear strip combinations
should be selected to provide maximum resistance to abrasive
wear. In general, thermoplastic materials are not recom-
mended because abrasive particles may imbed in the materials and result in rapid wear of chain
wear strips. Metal chains and wear strips are recommended
unless previous application experience shows that the ther-
moplastic materials give adequate service.
TEMPE RATU RE
The maximum and minimum recommended operating temper-
ature for chain and wear strips can vary due to the
presence of moisture. When two different materials are pres- ent in the construction of a chain, the more critical
material temperature rating will apply. If temperature exceeds
the maximum or minimum shown, contact Rexnord.
LUBRICATION
conveyors should always be lubricated.
CAUTION
and/or softer
TableTop®
TableTop®
Enlarged view of plastic wear strip
embedded with glass particles.
Abrasive wear of thermoplastic
chain.
Stainless Steel
Materials
- 100
Temperature
Dry WetDry
(250)
(250)
(250)
(250)
150 180
TEMPERATURE GUIDE, DEGREES F.
For continuous operation on 150° F, water, allowable load on one-piece link Acetal
and LF Acetal chains should be reduced. Consult Rexnord, Inc.
*Properties other than ability to resist temperature should be considered. i.e. stress
corrosion cracking, corrosion, etc.
Temperature shown in ( ) indicate temperature to which material may be subjected
for brief intermittent periods. For example, chains can be steam cleaned, but
caution should be used to avoid continuous exposure.
S881, SS881, 1874 and 1874SS
Whenever possible, lubrication should be used to assure
maximum chain life and optimum conveyor operation.
Types of lubrication normally used are: oils, water soluble
lubricants, soaps and plain water. See pages 15 and 16 for
detailed lubrication recommendations and methods.
In most conveyors including those using both metal and
thermoplastics chains, it is advisable to prelubricate both
the conveyor (carrying and return wear strips and curves)
and the chain prior to running. This will achieve best
"break-in" of chain and wear strips during the initial run-in.
In some applications the presence of a lubricant cannot be
tolerated. If the conveyed product or operation cannot
tolerate lubrication it is recommended that chains made of
LF Acetal material be considered.
STATIC ELECTRICITY
Under certain conditions, thermoplastics can acquire a
static charge. In theory, at least, it is possible that this
condition can cause a spark. Therefore, it is advisable to
use extreme caution when applying thermoplastic chains,
sprockets or wear strips in a combustible environment.
Consider "AS" material or metal chains.
If thermoplastics are used in a combustible environment, takethe necessary precautions. These include:
1. Avoid dry and/or cold environment.2. Ground entire conveyors using metal components.3. Lubricate if possible.4. Use static spark suppressors.
ENVIRONMENTAL
CONDITIONS
Rex
®M
ultiflex C
hain
s
Rex® Engineering Manual MF-12
CORROSION RESISTANCE GUIDE- CHAIN AND WEAR STRIP MATERIALS
Common or Chemical Name
Solutions contained in the product conveyed as well
as solutions used to clean or lubricate the chain and
equipment may result in corrosive attack of chain
and tracks. Chain and track material have varying
degrees of resistance to corrosion. Use this guide to
help you select chain materials for various corrosive
environments.
With thermoplastics, do not use cleaning or
lubricating agents with a pH below 4 or above 10.
Or chemicals containing chlorine or free ammonia.
These agents may cause immediate attack or
"crazing" after several applications due to
concentration by evaporation.
This table is based on data available by suppliers of
the various materials. For those chemicals with a
marginal or unsatisfactory rating - or for chemicals
not included - contact Rexnord for
recommendations.
Steel
Nylon
and
Nylatron®Austenitic
Series
Ferritic*
and
Martensitic
Series
LF
Acetal
and
Acetal
Chemically
Resistant
Plastic
(P)
Ultra High
Molecular
Weight
Polyethylene
(UHMWPE)
Poly-
propylene
(HT)
Poly-
ethylene
(LT)
(DATA BASED UPON 68°f)
Acetic Acid (over 5%-up to 50%
Acetone
Alcohol
Ammonia
Beer
Beverages-Soft Drinks
Benzene
Brine (pickle)
Carbon Tetrachloride
Chlorine
Citric Acid
Cyclohexane
Ethyl Chloride
Formaldehyde
Formic Acid
Fruit Juices
Gasoline
Hexane
Hydrochloric Acid (up to 2%)
Hydrochloric Acid (up to 37%)
Hydrogen Peroxide
Iodine
Isopropanol (isopropyl alcohol)
Kepodene
Lactic Acid
Methylene Chloride
Milk
Muriatic Acid
Nitric Acid (low concentrations)
Oil (vegetable or mineral)
Paraffin
Phosphoric Acid (up to 10%)
Soap and Water
Sodium Chloride
Sodium Hydroxide (up to 25%)
Sodium Hypochlorite (Bleach)
Stearic Acid
Sulphuric Acid (up to 40%)
Toluene (Toluol)
Turpentine
Vegetable Juices
Vinegar
Water (fresh)
Whiskey
Wine
Xylene
U
U
S
M
S
S
S
U
M
U
U
S
U
U
S
U
U
U
U
S
S
U
S
U
U
S
S
U
M
U
U
U
U
U
S
M
U
U
S
S
S
M
S
S
S
S
S
S
M
S
U
M
S
S
U
S
S
U
U
U
U
S
S
M
S
U
U
S
S
U
S
S
U
U
S
U
S
S
S
S
S
S
S
S
M
S
S
S
S
S
S
M
M
U
S
S
S
U
S
S
S
U
U
S
U
S
S
S
S
S
U
S
S
S
S
S
M
S
U
S
U
S
S
S
S
S
S
S
S
U
S
S
S
S
S
S
U
M
U
M
S
U
M
S
S
U
U
M
U
S
S
U
S
U
M
S
S
U
S
U
S
U
S
U
S
S
U
S
S
S
S
U
S
S
U
S
S
S
M
S
U
M
S
S
S
U
S
S
S
U
U
U
U
S
S
S
S
S
U
U
S
S
U
S
S
S
U
M
U
M
S
S
S
S
S
S
S
S
S
S
S
S
S
M
S
M
S
S
U
M
S
S
S
M
U
S
S
S
M
S
M
S
U
S
S
S
S
S
S
S
S
S
S
S
S
U
U
S
S
S
S
S
M
S
S
S
S
S
S
M
S
M
S
S
U
M
S
S
S
M
S
S
M
S
M
S
S
S
S
S
M
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
U
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
U
S
S
S
U
S
S
S
S
S
S
S
S
U
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
M
S
M
S
S
U
M
S
S
S
M
U
S
S
S
M
S
M
S
U
S
S
S
S
S
S
S
S
S
S
S
S
U
U
S
S
S
S
S
M
ENVIRONMENTAL
CONDITIONS
CORROSION
Rex
®M
ult
ifle
x C
hai
ns
MF-13 Rex® Engineering Manual
BASED ON PRODUCT SIZE AND SPACING
PRODUCTS PER FOOT OF CONVEYOR FOR VARIOUS CONVEYOR WIDTHS
Conveyor Flow Width = 3 Inches Conveyor Width = One Strand x 3% Inch Flight Width
Products Per Foot Conveyor Flow Width = 12 Inches Conveyor Width = Two Strands x 6 Inch Flight Width
FORMULA FOR FINDING NUMBER OF ROUND CONTAINERS PER SQUARE FOOT OF AREA FOR FULLY PACKED CONDITIONS (ROUND CONTAINERS)
Containers Per Square Foot = Where:
D = Container Diameter - Inches
Where:
Diameter - Containers Per Square Meter =
PRODUCT CONVEYED - MATERIAL, SIZE, WEIGHT
The size of the product conveyed, and the
production output determine the conveyor width
required (conveyor width = number of strands x
chain flight width). For example, as shown in the
sketches below, it is possible to obtain a production
output of 1600 products per minute (3" diameter
cans) by conveying in single file at 400 feet per
minute. Same output could be accomplished by
using a wider chain, at a slower speed of 100 feet
per minute.
PRODUCTS PER FOOT OF CONVEYOR
CONVEYOR FLOW WIDTH
(SPCING BETWEEN
GUIDE RAILS)
PR
OD
UC
T S
IZE
- in
ch
es
4 PRODUCTS PER FOOT
16 PRODUCTS PER FOOT
D = Container Millimeters
166.277
1.5 x 106
D2
D2
Product
Contact Surface
Dairy Products
Cafeteria Products
Food
Household Items
Rated Size Contents Size - Inches
Total Full
WeightEach, Lbs.Material
1/2 PintOintQuart1/2 GallonGallon
1/2 lb.1 lb.2 lb.
Milk
CottageCheese
Paper
Paper
3 x 33 x 3
3 1/8 x 3 1/84 1/8 x 4 1/8
6 x 6
0.6 1.1 2.3 4.5 8.8
0.6 1.1 2.3
4 Dia.4 3/4 Dia.
5 Dia.
(Weights and sizes will vary; consult Rexnord Inc.for assistance in selection.)
12 oz.
RegularJunior
10 1/2 oz.
Meat
BabyFood
Soup
Metal
Glass
Metal
3 7/8 x 2 1/8 Rect.
2 3/8 Dia.2 3/8 Dia.
0.94
0.56
0.8
0.8
12 oz.22 oz.32 oz.
Quart1/2 GallonGallon
SoapLiquidDetergent
Bleach
Plastic
Plastic
3 3/8 x 2 Oval3 3/4 x 2 5/8 Oval4 1/2 x 2 5/8 Oval
3 1/4 Dia.4 3/4 Dia.6 1/4 Dia.
0.9 1.6 2.3
2.4 4.8 9.5
* Non Returnable
Product
Contact Surface
Beverages, Juices
Rated Size Contents Size - Inches
Total Full
WeightEach, Lbs.Material
29 oz.46 oz.
6 oz.12 oz.
7 oz.8 oz.12 oz.16 oz. 24 oz. 28 oz. 32 oz.
12 oz.
16 oz.32 oz.
1 Liter2 Liter
12 oz.12 oz.16 oz.32 oz.
12 oz.
8 oz.12 oz.16 oz.
1/2 lb.1 lb.2 lb.3 lb.
6 oz.10 oz.
Citrus
CitrusConc.
SoftDrink
SoftDrink
SoftDrink
SoftDrink
Beer
Beer
Beer
Coffee
CoffeeInstant
Metal
Paper
Glass
Metal
Plasti-shield
PET
Glass
Metal
Metal (Alum.)
Metal
Glass
3 3/8 Dia. 4 1/4 Dia.
2 1/2 Dia. 2 5/8 Dia.
2 1/8 Dia. 2 3/8 Dia. 2 5/8 Dia. 2 5/8 Dia. 3 1/8 Dia. 3 3/8 Dia. 3 5/8 Dia.
2 5/8 Dia.
2 3/16 Dia. 3 3/8 Dia.
3 3/16 Dia. 4 3/16 Dia.
2 1/2 Dia. 2 3/4 Dia. 2 3/4 Dia. 3 3/4 Dia.
2 5/8 Dia. 2 5/8 Dia. 2 5/8 Dia.
2 11/16 Dia.
4 1/8 Dia. 4 1/8 Dia. 5 1/4 Dia. 6 1/4 Dia.
3 1/2 Dia. 3 7/8 Dia.
2.3 3.6
0.54 1.0
1.1 1.4 1.9 2.1 3.1 3.6 3.9
1.0
1.6 3.1
2.4 4.7
1.5 1.2 1.6 3.4
0.63 0.94 1.2
0.8
0.8 1.3 2.5 3.8
1.1 1.6
CHAIN FLIGHT
WIDTH
Rex
®M
ultiflex C
hain
s
Rex® Engineering Manual MF-14
GENERAL INFORMATION
Chain in service will generally wear out before it breaks in
fatigue, if it has been selected properly for the application. For
straight running chains, the normal wear areas are the top
flights and pin joints. Sideflexing chains also wear in this
manner. But sideflexing chain wear life is usually limited by
wear of the reach bar surfaces which contact the corner wear
strips.
Proper chain and wear strip selection will provide optimum
chain and wear strip life. Friction and wear resistance are two
factors which should be considered when selecting a wear strip
material:
1. The lower the coefficient of friction between the chain
and wear strip, the longer the chain life.
2. The greater the wear resistance of the chain and wear strip
materials, the longer the chain life and wear strip life.
Of course, the combination of chain tension, top load, type of
lubrication, abrasion and speed of a given conveyor will govern
the final wear rate of a particular chain-wear strip combination.
The worst condition is high speed, dry operation.
Rexnord has accumulated many years of application
experience as well as laboratory test data on chain-wear strip
compatibility. The following general guide lines will help in the
application of wear strip materials.
See Page 17, Multiflex for specific recommendations.
METAL WEAR STRIPS
Metal wear strips are harder than non-metallics, and in addition
can be heat treated or work hardened to increase hardness.
They are, therefore, suited for applications where abrasive
particles are present either from the environment or from the
products carried. Abrasive particles are less likely to embed in
metal wear strips.
For non-corrosive environments, plain carbon steel. cold
finished, is recommended. For corrosive environments, use
stainless steel, one quarter temper minimum (25. Rc). cold
finish.
STEEL
Plain carbon, cold rolled steel is recommended. Surface finish
should be 32-63 RMS. Use heat treatable grades where
available and hardened to 25-30 Rc. Lubricants used should
have rust inhibitors added.
STAINLESS STEEL
Cold rolled finish (32-63 RMS) is recommended. An austenitic
grade offers the best corrosion resistance.
The softer annealed grades of austenitic stainless steel are
NOT RECOMMENDED, especially with thermoplastic chains.
Interaction between the chain material and the soft stainless
steel might develop. When this happens, the resulting wear
debris consists almost entirely of finely divided stainless steel
particles, nearly black in color, similar to molydisulfide or
graphite. The wear of the stainless steel might be rapid while
the thermoplastic chain by contrast exhibits only slight wear.
Therefore, ONE QUARTER TEMPER (MINIMUM 25 Rc.)
austenitic grade stainless is recommended for use with
any of the chain materials, but especially with
thermoplastic. Martensitic stainless steels can also be
used. They offer excellent wear resistance when heat
treated to 25-35 Rc, but they are not as corrosion resistant
as austenitic.
BRONZE AND BRASSES
These materials are sometimes used with stainless steel
chains. A hard temper material is recommended since a soft
bronze wears rapidly. Typical applications calling for these
metals are those which require non-sparking and anti-static
conditions.
ALUMINUM
Not recommended due to poor wear resistance.
NON-METALLIC WEAR STRIPS
Non-metallic wear strips have a lower coefficient of friction than
metals. They are generally easier to install and remove and
provide for quieter operation. Nylatron® is the preferred
material, especially for dry operation at high load or high speed
conditions around corners. Ultra high molecular weight
polyethylene is also recommended for all well lubricated
applications and some dry applications.
ACETAL
Not recommended for use with Acetal chains. It is best not to
run identical plastics together.
Nylatron® (nylon with molydisulfide filler) is the preferred
material for dry applications because of its low wear rate and
low friction. It is especially suited for dry operation on
thermoplastic sideflexing chain corners.
Although Nylatron® is more stable in wet applications than most
nylons it will absorb moisture and expand. Therefore, room for
expansion must be provided and fasteners must allow for
movement.
ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE
UHMWP
UHMWP polyethylene (molecular weight of at least 1.0 million)
is recommended for both dry and wet applications on straight
runs. It is also recommended for all well lubricated corners and
non-lubricated corners where chain load and speed are low. It
is NOT RECOMMENDED for dry operation on corners where
the chain load or speed are high.
UHMWP has a wear rate equivalent to nylon in non-lubricated
applications. It is virtually unaffected by moisture and is more
resistant to corrosive chemicals than nylon. It is not as rigid as
cast nylon and may deflect when subjected to high loads from
sideflexing chains.
TEFLON
This material has perhaps the lowest coefficient of friction
available in a plastic wear strip material. It is soft and tends to
flow off the surface and is not practical as a wear strip material
except in low load - low speed applications.
LUBRICANT IMPREGNATED WOOD
Suitable for dry applications where self-lubricating properties of
the material are best utilized. Not recommended for abrasive
conditions where particles may embed in the surface and wear
the chain.
CHAIN AND
WEAR STRIP
COMPATIBILITY
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The chain flight and wear strip materials must satisfy the
requirements of the individual application. These
requirements are determined by the type of product
conveyed, and the environmental conditions discussed
on Pages 12, Multiflex. The chain flight should be
compatible with the product conveyed, and the wear
strip compatible with the chain flight.
The table below shows the recommended combination
of chain (chain flight material) and wear strip for both
straight run and sideflexing conveyors under both
abrasive and non-abrasive conditions. The chains are
listed in order of increasing cost. The wear strips are
listed in order of preference based on performance
and/or cost.
Example: Sideflexing conveyor handling aluminum
cans, no abrasion, dry operation.
Procedure: In the sideflexing chart, find the column
under NO ABRASION designated DRY. Read down the
column to the proper row for recommended chains and
chain flight material. At the bottom of the column the
recommended wear strip materials are listed in order of
preference.
Solution: Chain flight material - Thermoplastic
First choice of chain - LF880
Wear strip material - Nylatron®
For the mildly abrasive applications which fall in
between the two extremes, the choice of chain flight
material is still based on top plate and product
compatibility. Then non-metallic wear strips might be
used if the chain flight is steel or stainless steel. Or, if
the chain flight material is thermoplastic, steel or
stainless steel wear strips are used.
CHAIN FLIGHT AND WEAR STRIP MATERIALS
RECOMMENDED CHAINS AND WEAR STRIPS
STRAIGHT
RUN
SIDEFLEXING
THERMOPLASTIC
STEEL
STAINLESSSTEEL
WEAR STRIPMATERIAL
CH
AIN
FL
IGH
T
THERMOPLASTIC
STEEL
STAINLESSSTEEL
WEAR STRIPMATERIAL
CH
AIN
FL
IGH
T
CONDITION
ABRASION NO ABRASION
WELL LUBRICATED DRY WELL LUBRICATED DRY
CONDITION
ABRASION NO ABRASION
WELL LUBRICATED DRY WELL LUBRICATED DRY
S815
864
S815
SS864
C.F. Stainless Steel C.F. Steel
D820, D831
D821
DSS843
DSS963
S815
864S815
864
S815
SS864
S815
SS864
UHMWP
Nylatron®
C.F. Stainless Steel
UHMWP
Nylatron®
Lubricant
Impregnated Wood
C.F. Steel
SS881
SS881TAB
SS1874
S811, S881TAB
SS881
SS881TAB
SS1874
SS881
SS881TAB
SS1874
SS881
SS881TAB
SS1874
SS881
SS881TAB
SS1874
S811, S881TAB
SS881
SS881TAB
SS1874
LF879D880
LF882, LF882TABLF1843
DSS1873DSS3873
LF879, LF879TABLF880, LF880TABLF882, LF882TAB
LF1843LF1873LF3873
UHMWP
Nylatron®
C.F. Stainless Steel
Steel
Nylatron®
Steel
*C.F. Stainless Steel
UHMWP
Nylatron®
Not recommended
to run metal
sideflexing chains
dry** -
consult Rexnord
** Selective lubrication is required in corners. * Can be noisy in completely dry applications.
CHAIN AND
WEAR STRIP
SELECTION
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INSTALLATION
SELECTIVE LUBRICATIONMETHOD OF FURNISHING LUBRICANT
TO CHAIN THRUST SURFACE
, 1/32 Min. Ctsk. Depth
Locate
Fitting at
Proper care and maintenance of TableTop® chains will
provide smooth, efficient operation and, in turn,
extended chains and conveyor life. It is, therefore,
necessary to consider the factors that influence a "good"
maintenance program. Namely: 1) Proper installation 2)
Good lubrication 3) Cleanliness 4) Periodic Inspection
and 5) Repair and Replacement of worn components.
INSTALLATION
Before installing chain:
1. Check conveyor for flatness and obstructions.
2. For bevel design sideflexing chains, make sure outer
wear strip of each curve is about 1/32" lower than
inside wear strip to keep chain from rising up on the
outside.
3. Check sprocket alignment.
4. Pull a short (about three feet) section of chain through
LUBRICATION
of tight clearance. Make sure TAB chains have plenty
of clearance, especially on the inside of curves.
5. Rework conveyor to remove obstructions and provide
proper chain clearance.
6. Install the chain.
CAUTION: Install chain in 10 - foot sections, making
all connections on the conveyor frame. Thread
chain onto conveyor carefully to avoid twisting and
possible damage to the chain. Make sure all chains
except, 864, 1874 and 1873 are facing in the correct
direction for travel as indicated on the bottom or
side of the chain.
Start up conveyor and inspect according to checklist on
page 18, Multiflex. Correct any problem areas. Frequent
inspection and adjustment is recommended during the
run - in period to avoid any problems.
LUBRICATION
S881, S881TAB, SS881, SS881TAB, 1874 AND
SS1874 conveyors should always be lubricated.
Whenever the application permits, lubrication is
recommended. It not only reduces friction, thereby
reducing chain tension, but it also greatly improves the
wear life of chain and wear strips. Be sure the lubricant
coats both the chain and wear strip mating surfaces.
This is especially important on sideflexing chains and it
is sometimes necessary to apply the lubricant at the
entrance of the inside curves.
If lubrication is not compatible with the application, a
brief break - in lubrication application is beneficial. Apply
a light mineral oil to sideflexing chains prior to
installation. Also, apply oil to TableTop® base roller
chains prior to installation.
Some types of lubricants an lubrication methods are
described here:
TYPES OF LUBRICANTS
A. Oil Base Lubricants - These are vegetable or mineral
oils which offer high lubricity and coat the corrodible
chain parts. They should be used whenever practical
on all metal chains.
B. Water Soluble Lubricants and Soaps - These are
excellent lubricants and many of them help clean the
chain. Since the water is the conveying medium, they
are primarily suited for chains having corrosion resistant
parts or those with corrosion resistant top plates.
C. Water - Can be used as a lubricant although it is not
as effective as other types. If water is used as the
lubricant for plastic chains, sliding on a stainless steel
pan, the drag on the chain may be increased since a
thin film of water must constantly be sheared.
METHODS OF LUBRICATION
A. A central plumbing station meters lubricant under
pressure to locations through piping arrangement.
B. Sideflexing chains may be lubricated effectively by
applying the lubricant directly to the thrust surface below
the top of the flight as the chain enters the curve.
C. The lubricant drips onto the chain from an overhead
storage tank.
D. Bar soap with dripping water applied directly to the
chain.
E. The return chain strand runs through a pan of
lubricant.
F. The return chain contacts wheels of porous material
which rotate in a lubricant supply tank.
Locate
Fitting at
Commercial Grease
Fitting
TYPICAL
INSTALLATION
AND
MAINTENANCE
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CLEANING
REPAIR AND REPLACEMENT
CLEANING
In many applications, rapid build-up of grease, dirt, grit,
sand, spilled syrup and beverage can occur. These result in:
1. Soiling and damage to the conveyed product.
2. Increased work demands for the chain and motor.
3. Accelerated sprocket tooth wear.
4. Conveyor pulsation and wear.
5. Excessive chain wear on the flight and in the joint areas.
6. Rapid wear of the wear strips.
Frequent cleaning of the chain and conveyor frame is
advised. Such agents as steam, warm water and soap are
commonly used. Many times combined "cleaners/lubricants"
are applied continuously. Strong caustic agents used with
metal chains should not be used with plastic chains. Always
rinse cleaning agents completely off of chain and conveyor
frame. When excessive amounts of syrup or other liquids,
broken glass or debris accumulate, cleaning will be required
on a regular basis to remove these undesirable materials. It
is advisable to have operating personnel keep brushes and
cleaning solutions nearby to remove broken glass and
excessive spillage.
CAUTION: ALL cleaners and lubricants must be
compatible with chain and conveyor materials. See
Page 13, Multiflex.
INSPECTION
In the course of conveyor operation, periodic inspection of
the chain, sprockets and system is required to detect faults
and make repairs before serious damage occurs. the
important thing is to set up a regular inspection and
maintenance schedule.
CHECKLIST
1. Look for unusual wear patterns on the chain.
2. Inspect chain for lack of top surface flatness.
3. Check for excessive gap between flights due to jam-up or
overload.
4. Pulsating, jerky chain operation indicates poor lubrication
or a conveyor obstruction.
5. Check dead-plate and turnable clearance.
6. Examine sprockets for signs of excessive wear.
7. Examine sprockets for signs of dirt build-up in tooth
pockets.
8. Check for sprocket guide ring wear and possible chain
misalignment.
9. Check the ways and wear strips for excessive wear.
10. Inspect lubrication system for proper operation.
11. Check the inside of curves and the supporting conveyor
frame for excess heat build-up which may indicate an
obstruction in the curve or a high friction area.
12. If return support rollers are used, check to insure rollers
are free turning.
REPAIR AND REPLACEMENT
Any malfunctions found during an inspection usually stem
from one or more of the following conditions:
1. Severe overloads, jam-ups or wedging of broken glass or
crowns.
2. Severe back-flexing of chain on the return carrying ways.
3. Poor lubrication or no lubrication.
4. Interference and obstruction.
5. Worn sprockets.
6. Poor conveyor design.
7. Badly worn or damaged chain.
These causes should be corrected to avoid future problems.
INSPECTION
Chain and sprockets should be replaced when:
1. The chain measures approximately 123 inches in 120
flights for 843 and 1843 chains; in 40 flights for 2500
chains; in 61 pitches for 1700, 1701, 1701TAB and 1702
chains; and in 80 flights for all other chains.
2. The chain jumps the sprocket.
3. The flights have worn to about one-half the original
thickness.
4. The conveying surface becomes uneven through wear.
5. The thrust surface of sideflexing chains wears away and
exposes the rivet or other metal parts which may cut into
wear strips or other conveyor component.
6. The sprocket teeth develop a hooked profile or the chain
tends to "hang up" on the sprocket teeth.
These suggestions on chain and conveyor care serve as a
guide toward maintaining continuous, trouble-free operation.
Implementation of a conscientious programmed
maintenance schedule will lead to many productive hours of
conveyor operation.
INSTALLATION
AND
MAINTENANCE
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