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7/28/2019 Screens & Feeders Maintenace
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Sandvik Mining and Construction
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7/28/2019 Screens & Feeders Maintenace
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Sandvik Mining and Construction
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Sandvik Mining and Construction
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Sandvik Mining and Construction
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Terms
1. Screen body2. Screen cloths / screening
media
3. Drive motor / unit
4. Mechanism
5. Spring support
6. Dust encapsulation (option,not shown in photo)
1
2
43
5
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Sandvik Mining and Construction
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Material flow directionMaterial flow directionMaterial flow directionMaterial flow direction
Drive unitDrive unitDrive unitDrive unit
Discharge endDischarge endDischarge endDischarge endFeed endFeed endFeed endFeed end
Vibrating unitVibrating unitVibrating unitVibrating unit
Right SideRight SideRight SideRight Side
Left SideLeft SideLeft SideLeft Side
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6
1 2
3 4
5 78
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Sandvik Mining and Construction
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Sandvik Mining and Construction
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Maximum allowed height differencebetween spring supports (same end) is 3 mm!
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Spring supportpedestals
Water hose
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Sandvik Mining and Construction
Widht of the screen in metres 1,0 1,2 1,5 1,8 2,1 2,4 2,7 3,0
Center distance of spring supportpedestals in mm
1400 1600 1900 2200 2500 2800 3100 3400
1height difference in mm 24 28 33 38 44 49 54 59
2height difference in mm 49 56 66 77 87 98 108 119
3height difference in mm 73 84 99 115 131 147 162 170
Table below shows what 1, 2 and 3 degrees inaccuracy inspring pedestal on one side of the screen means in mm toscreens level.
1
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Torsional displacement
7 degrees nominal load
Radial displacement
1-2 mm
Axial displacement
2-5 mm
Conical displacement
2-5 degrees constant 8-12 degrees temporary
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Cardan AdapterPre-compression band
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Sandvik Mining and Construction
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Sandvik Mining and Construction
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Sandvik Mining and Construction
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Sandvik Mining and Construction
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Sandvik Mining and Construction
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Sandvik Mining and Construction
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Sandvik Mining and Construction
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Sandvik Mining and Construction
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Stroke Stroke length
frequency Linear stroke screens (like LF) Circular stroke screens (like SC, CS,)(stroke in centre of the screen)
920 rpm 9.5 mm 8 mm
820 rpm 12.0 mm 10 mm
730 rpm 15.0 mm 13 mm
Remember that increased stroke length shortens the bearing lifetime!
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Sandvik Mining and Construction
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2
3
4
5
6
7
8
500 600 700 800 900 1000 1100 1200 1300
3
5
7
9111315171921
G
-force
rotation speed (rpm)
Stroke length (mm)
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Sandvik Mining and Construction
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Sandvik Mining and Construction
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Shape of SC / CS / XS screens stroke(screens, where the mechanism is closeto gravity point of the unit)
Stroke is circular
Shape of MSO-screens stroke
Stroke is elliptical in end of the screen, circularin the middle
Stroke angle is hard to determinate.
In G-force calculations the stroke in the middle
should be used
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Sandvik Mining and Construction
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Shape of LF-screens and feeders stroke
two shafts
Stroke is mainly linear (just a bit elliptic)
Stroke angle is about 60 degrees.
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Sandvik Mining and Construction
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SANDVIK
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Sandvik Mining and Construction
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Example:
Linear stroke screens Circular stroke screens
Stroke length Stroke angle Stroke length
12 mm 55 degrees 12 mm
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Sandvik Mining and Construction
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Sandvik Mining and Construction
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Click the screen above to see whathappens to screen body whenrunning in resonance
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Sandvik Mining and Construction
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Sandvik Mining and Construction
Notice that any kind of welding or excessive heating of screen body is not allowed withoutconsulting manufacturer first!
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Sandvik Mining and Construction
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picture 1
picture 2 fastening bolts
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Sandvik Mining and Construction
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Moving directionsMoving directionsMoving directionsMoving directions
Bigger (steeper) Smaller (lower)
stroke angle stroke angle
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Sandvik Mining and Construction
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Sandvik Mining and Construction
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Mech.size
Gear wheel part numberNumber of teeth in gearwheel
one tooths effection tostroke angle
B13 713.0676-001 60 3,0
B16 MGF-B16-OP5 80 2,25
B20 MSS-B201-OP3 90 2,0
B24 MGF-B24-OP11 60 3,0
B30 ST5194-B30-OP4 70 2,57
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Sandvik Mining and Construction
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1. Bearing house
2. Space tube 3. Shaft
4. Counterweight
5. Bearing
7. Cover
8. Counterweight
guard
4. Extra counterweights
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Sandvik Mining and Construction
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Bushing
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Sandvik Mining and Construction
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Bearing size
Bearing house Shaft
Diameter Tolerance Diameter Tolerance
B16 170P6-0,036
-0,06180g6
-0,010
-0,029
B20 215P6-0,041
-0,070100g6
-0,012
-0,034
B24 260P6-0,047
-0,079120g6
-0,012
-0,034
B30 320P6-0,051
-0,087150g6
-0,014
-0,039
B34 360P6-0,051
-0,087170f6
-0,043
-0,068
B38
with
bushing
460H7
Bearinghouse
+0,063
+0,000
190f6
-0,050
-0,079
460k7
(Bushingoutside )
+0,068
+0,005
400P6
(Bushinginside )
-0,051
-0,087
s~=r
`~==~
s~ r
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Sandvik Mining and Construction
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s~ r
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Sandvik Mining and Construction
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s~ r
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Sandvik Mining and Construction
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figure 1
photo 1
s~ r
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Sandvik Mining and Construction
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Photo 2
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s~ r
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Sandvik Mining and Construction
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photo 3: item 7
figure 3
SK i===~===~=~
s~=r
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Sandvik Mining and Construction
`~==~TK m==~====~==
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figure 4
s~=r
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Sandvik Mining and Construction
`~==~o~
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s~=r
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Sandvik Mining and Construction
`~==~j==~W
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figure 5
photo 4
s~=r
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Sandvik Mining and Construction
`~==~PK _=~===~I==~===
==~===I=~===~K=^==^=EKK=phc=id^c=PbLMIRF=~=====~=~=~==
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photo 5 photo 6
s~=r
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Sandvik Mining and Construction
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figure 6
photo 7
figure 7
middle-pullingrod
s~=r
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Sandvik Mining and Construction
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figure 7
Filled with grease in connection with assembly
s~=r=
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Sandvik Mining and Construction
`~==~TK ^~===~=== ~~=====~K=t==~=====~==
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s~=p
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Sandvik Mining and Construction
j~~==a=jpl=
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picture 1
picture 2
s~=p
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Sandvik Mining and Construction
j~~==a=ic=
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picture 1
picture 2
in picture 2 cardan shafts not shown
s~=p
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Sandvik Mining and Construction
j~~==a=ic=
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s~=p
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Sandvik Mining and Construction
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picture 1
picture 2
in picture 2 cardan shafts not shown
s~=p
7/28/2019 Screens & Feeders Maintenace
75/105
Sandvik Mining and Construction
j~~==a=pd=~=ps=
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picture 1
s~=p
7/28/2019 Screens & Feeders Maintenace
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Sandvik Mining and Construction
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picture 1
s~=p
7/28/2019 Screens & Feeders Maintenace
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Sandvik Mining and Construction
j~~=L=i~jpl=~=ic==~=ps=
^ p~== =~
_ _~` `~~==~= ~= ~=
^=~
a a==E~=~==~~=~F bm=O==~=E=~=~F
AB
C
D
H = height of oil level.
measured from center of
the tube
s~=p
7/28/2019 Screens & Feeders Maintenace
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Sandvik Mining and Construction
j~~=L=i~
Antifretgreasebetweenbearing andshaft
Grease nipples for cardanshaft
s~=p
7/28/2019 Screens & Feeders Maintenace
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Sandvik Mining and Construction
j~~=L=i~o=~
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B. Mineral oils
s~=p
7/28/2019 Screens & Feeders Maintenace
80/105
Sandvik Mining and Construction
j~~=L=i~o=~
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p=~=~====~=====
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s~=p
7/28/2019 Screens & Feeders Maintenace
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Sandvik Mining and Construction
j~~=L=i~j~===Eic=L=jpl=L=ps=L=pdF j~===Eup L=`p=L=p`F
s~=p
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Sandvik Mining and Construction
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s~=p
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Sandvik Mining and Construction
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PARALLEL MISALIGNMENT PARALLEL MISALIGNMENT
s~=p
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Sandvik Mining and Construction
j~~=L=qJ f==~=~====~==K=^==~=~=~=~~===
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Centre Distance Allowance For Installation(Flanged Pulleys Removed)
and Tensioning (mm)
Additional Centre Distance Allowance ForInstallation Over Flanged Pulleys
Belt Installation
Allowance
Tensioning
Allowance(Any Drive)
Belt Pitch One Pulley
Flanged(mm)
Both Pulleys
Flanged(mm)
1000mm and under 1,8 0,8 5mm
8mm14mm
12
2236
19
3358
Over 1000mm to 1780mm 2,8 0,8 LH
2532
3548
Over 1780mm to 2540mm 3,3 1,0
Over 2540mm to 3300mm 4,1 1,0
Over 3300mm 5,3 1,3
s~=p
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Sandvik Mining and Construction
j~~=L=qJq~==
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Insert push into pulley
Insert screws and locate onshaft
s~=p
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Sandvik Mining and Construction
j~~=L=qJ
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Tighten screws alternately
Tighten screws finger tight
s~=p
j L q
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Sandvik Mining and Construction
j~~=L=qJq=
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To remove
s~=p
j L q
7/28/2019 Screens & Feeders Maintenace
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Sandvik Mining and Construction
j~~=L=qJ
s~=p
j L q
7/28/2019 Screens & Feeders Maintenace
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Sandvik Mining and Construction
j~~=L=qJ
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b===K= =======~===~===~=~=K
s~=p
j L q
7/28/2019 Screens & Feeders Maintenace
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Sandvik Mining and Construction
j~~=L=qJ q=~====~===~=W
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`OQ OSKR NO NMM
`OM OQKR NO UU
`NS OM NO TR
s~=pj~~=L=qJ
7/28/2019 Screens & Feeders Maintenace
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Sandvik Mining and Construction
t===~====~===~====~=~=~====E=F====K=^=====~=EFI=~=~==~===~==
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`~======~===~~==~=K
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s~=pj~~=L=qJ
7/28/2019 Screens & Feeders Maintenace
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Sandvik Mining and Construction
F q=~=
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Formula 16
s~=pj~~=L=sJ
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Sandvik Mining and Construction
sJ_==~~
_=====~=====~K _==~=~===~==~==K r=~=~====~====~K
`====sJ=======K
f~
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s~=pj~~=L=sJ
7/28/2019 Screens & Feeders Maintenace
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Sandvik Mining and Construction
q====~===~===~====~==~==~==~~K= t===~==I=~====~=I=====~===
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q=sJ==~=~=====~===EQF=K q====~===~===~====~==~==~==~~K= t===~==I=~====~=I=====~===
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7/28/2019 Screens & Feeders Maintenace
95/105
Sandvik Mining and Construction
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s~=p=C=cq=
7/28/2019 Screens & Feeders Maintenace
96/105
Sandvik Mining and Construction
Trouble Possible cause Correction
Screen does not start or itstops during operation.
1. Electrical fault.Check wiring and components andcorrect.
2. Too high oil viscocityChnage oil to correspond ambienttemperature.
3. V-belts slipping or broken.Check condition and tension ofbelts.
4. Timing belt broken.Check condition and tension ofbelts.
Screen running incorrectly (inmotion).
1. Screen contacts something duringoperation (base,m chute, material,ice etc.)
Arrange space for screen to runcorrectly.
2.V-belt/timing belt pulleys and/or V-belts/timing belts are worn.
Change new ones.
3.Drive equipment is wronglypositioned in relation to vibrating
shaft.
Move and adjust according to
instructions.
4. Screen base not solid enough. Support.
5. Springs broken or tiredChange springs. Screen is galloping
overloaded add springs.
s~=p=C=cq=
7/28/2019 Screens & Feeders Maintenace
97/105
Sandvik Mining and Construction
Trouble Possible cause Correction
Drive equipment deflects andvibrates too much.
1. Fastenings has loosed. Tighten the fastening bolts.
Screen supporting framedeflects and vibrates toomuch.
1.Construction is too light orinsufficient bracing. Add support and brace.
2.Foundations of screen frame are notstrong enough.
Build up foundations.
3.Support structure critical frequencytoo close to to operating speed.
Build up foundations.
Unusual noise duringoperation.
1.There are loose or damaged parts inthe screen.
Tighten, repair or change the part.At the same time check all screwsfor tightness. Check the reason fordamage.
2.Screen contacts something duringoperation.
Arrange space for screen to run.
3. Screen meshes are loose. Tighten according to instructions
4. Bearing damage. See bearing damage.
5. Broken spring.Change spring after checking thecause.
s~=p=C=c=q=
7/28/2019 Screens & Feeders Maintenace
98/105
Sandvik Mining and Construction
Trouble Possible cause Correction
Unusual noise duringoperation (continued).
6.There are stones, dust, tools etcinside the counterweight guards.
Clean regularly.
7. There are stones between springs.Clean the spring systems regularlyand prevent material from buildingup between the springs.
Screen bearings overheat.
1.Incorrect amount of oil in vibratingshaft.
Check oil level.
2. Wrong type or old oil in shaft. Change oil.
3. Bearing damage. See bearing damage.
4.High temperatures in theenvironment or material.
Arrange ventilation and change theoil suitable for high temperatures.
5. Too high speed. Lower speed.
s~=p=C=c=q=
7/28/2019 Screens & Feeders Maintenace
99/105
Sandvik Mining and Construction
Trouble Possible cause Correction
Bearing damage.
1 Normal life of bearing exceeded.
Check amount of operating hoursand always replace damagedbearing with a new one. Check also
possible reasons for the damage.
2. Insufficient lubrication.Check lubrication maintenance andpossible oil leakages.
3. Unsuitable oil. Change oil type.
4.Foreign material (steel, sand etc.) in
oil.
Check the cause (some damagedpart, dirty conditions during oil
change, dirty cans in handling of oiletc.)
5.Shaft is not in level position, whenthe other bearing is overfilled andthe other underfilled with oil.
Adjust the screen to the rightposition according to instructions.
6. Axial loads bearing stuck on shaft.
Use corrosion protection lubricant
between shaft and bearing. See item6.8
s~=p=C=c=q=
7/28/2019 Screens & Feeders Maintenace
100/105
Sandvik Mining and Construction
Trouble Possible cause Correction
Bearing damage (continued).
7. Too high speed. Lower speed.
8. Too high G-force. Reduce stroke length/speed.
Oil leakage.
1. Breather is clogged. Clean or change breather regularly.
2.Seals are worn out or damaged (forinstance during assembly). Do notreuse old seals
Change the seals being careful thatthe new ones are not damagedduring installation.
3. Wear ring is worn out.Change wear ring to a new one. It isadvisable to change a new ring atthe same time with shaft sealing.
4. Oil level assembly loose or leakage. Tighten it.
s~=p=C=c=q=
7/28/2019 Screens & Feeders Maintenace
101/105
Sandvik Mining and Construction
Trouble Possible cause Correction
Aperture in screen meshes is
clogging or screen capacity isinsufficient.
1. Stroke angle or form incorrect. Adjust according to instructions.
2. Stroke lenght is too short.Adjust counterweights according toinstructions.
3. Too low frequency.Alter V-belt ratio by changingsheave.
4.
Unsuitable meshes (for instance toothick meshes in relation to aperture,shape of opening unsuitable, toosmall net opening percent etc).
Install suitable mesh.
5.Material includes plenty of clay,mud or other impurities.
Wash material before screening.
6. Too high feed rate to the screen. Reduce the feed rate.
7.Incorrect rotation direction of thestroke.
Change the rotation direction.
s~=p=C=c=q=
7/28/2019 Screens & Feeders Maintenace
102/105
Sandvik Mining and Construction
Trouble Possible cause Correction
Material flows mostly on oneside of the screen.
1. Incorrect feed to the screen.Re-position the feed so that it isevenly spread across the whole
width of the screen.
2.Screen is not running in the rightposition.
Check the horizontal position of thespring pedestals.
Too much material collectingat feed end of the screen.
1. Conveying rate of screen too low. See corrections above.
2. Too high feed rate or uneven feed. Adjust feed rate.
3.Material fed against the conveyingdirection of the screen
Arrange feed as per manual chapter3.2.
4.Direction of the screen rotationincorrect.
Check direction of rotation andchange if necessary.
5.Too heavy material load from the
chute above.
Adjust feed chute to remove head
load.
s~=p=C=c=q=
7/28/2019 Screens & Feeders Maintenace
103/105
Sandvik Mining and Construction
Trouble Possible cause Correction
Screen meshes wear or breakin some places rapidly;unusual high wear of meshes.
1.Wrong tensioning of meshes insome places, or generally in thewhole screen.
Check and retighten screen meshesaccording to instructions regularly.
2.Fed material falls onto the screenmesh instead of the receiving area.
Re-position feed arrangement.
3.Screen mesh unsuitable forscreened material.
Change the mesh. (for instancesteel wire mesh to rubber mesh).
4.High capacity of screen and highlyabrasive material.
Change the mesh. (for instancesteel wire mesh to rubber mesh).
Material spills from chutesonto maintenance platformsetc.
1.Feed or discharge chutesunsuitable or incorrectly installed.
Re-install and seal. It is notpermitted to connect extra parts tothe screen body as this can impairthe operation or damage the screen.
2.
Screen worn so badly that materialis leaking from feed or dischargeareas or side plates. This canhappen if wear plates are notchanged in good time or if they areloose.
Check the condition and fixing ofwear plates and change in good
time according to instructions.Check also tightening of the boltsregularly.
s~=p=C=c=q=
7/28/2019 Screens & Feeders Maintenace
104/105
Sandvik Mining and Construction
Trouble Possible cause Correction
In dust sealed screens, dustescapes.
1. Leak in the dust enclosure. Seal.
2.
Insufficient suction in the dust
enclosure.
Increase suction of vacuum inside
the enclosure.
Supporting springs of thescreen tilt too much.
1.Fastening screws in the springingsystem loose.
Tighten and change ifnecessary.
s~=p=C=ct~
7/28/2019 Screens & Feeders Maintenace
105/105
Sandvik Mining and Construction
q=~=~===~==~====~=~====~~=K=p====~======~~~I=~=~=~==~==~K=
p====~==W
t=~==~~=====~=~=~==~====>
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Recommended