166982613 Machine Drawing

7/25/2019 166982613 Machine Drawing

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MACHINE DRAWING

PRESENTATIONS


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PLUMMER BLOCKPLUMMER BLOCK

&&NON-RETURN VALVENON-RETURN VALVE

PRESENTED BY : RAVINDRA SINGH KHETWAL

YOGESH M. PATIL

TASSAR TATAM


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Plum

mer

INTRODUCTI

ON

PLUMMER BLOCK

Plummer blockis alsoknown as Pedestalbearing. For long shaftsrequiring intermediate

supports, plummer blockare preferred in place ofordinary bush bearings.

This bearing was namedafter its inventor PLUMMER.


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Detailed str!tre "# Pl$$er

Beari%

Part list :-

1. Cast-iron block with a sole

2. Cast-iron cap

3. Gun-metal brasses or steps

made in two halves

4. Two mild-steel bolts

. !e"a#onal nuts

$. %ock nuts


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&'() *+

Turbines

'hips

!eav, motors

*ndustrial machineries


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A Plummer blockis used for running shafts at highspeed and carrying heavy load. A Plummer blockconsist of cast- iron base, gun metal or phosphor

bronze brasses, bushes or steps made in two halvesand a cast iron cap. The two halves of the brassesare held together by a cap or cover by means ofmild steel bolts and nuts. Sometimes thin shims arealso introduced between the cap and the base to

provide adustments for wear. !hen the bottomwears out one of the two shims are removed andthe cap is tightened by bolts. The Plummer blockmust be lubricated properly.

PLUMMER BLOCKPLUMMER BLOCK


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Methods of preventing rottion of !rsses in !ering

The brasses are provided with collars or "anges on either

side in order to prevent its a#ial movements. To preventits rotation along with the shafts the following fourmethods are used$-

1. The snugs are provided at the sides.

2. snug is provided at the top, which !ts inside the cap.The oil hole is drilled through the snug.

". The steps are made rectangular on the outside and theyare made to !t inside a corresponding hole.

#. The steps are made octagonal and they are made to !tinside a corresponding hole.


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The above figures shows1.*nternal structure o a Plummer locks

2. /ssembled Plummer lock

1. 2.


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SELF ALIGNING PLUMMER BLOCKSELF ALIGNING PLUMMER BLOCK


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Plummer Blo"# BeringPlummer Blo"# Bering

$ousings$ousings range of split bearing housing available

with a variety of sealing arrangementsmade to accept double row self aligning ballbearings and spherical roller bearings.

The housing are generally cast iron with twobolt holes although some si$es are availablein steel.

The main bene!t of split plummer blockhousings is their easy installation% pre&assembled shafts can be mounted in them.'hen the housing bases are attached to the

base plate it is then only necessary to placethe housin ca s in osition and to ti hten


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Splitplummer blockhousings availableon themarket are mainly intended for self-

aligning ballbearings, spherical roller bearings of%S& 'imension Series (), (*, )), )*and *). They can often be +tted with

various dierent seals. any designsand variants of splitplummer blockhousings are available making the useof tailored housings unnecessary and

thus enabling cost eective bearing


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The basis of the plummer blockhousingsystem consists of a number of housingsof the same design but in di(erent si$es.)y combining these housings with the

di(erent standard seals a wide variety ofhousing variants, all belonging to thestandard range, can be supplied to coverthe ma*ority of demands for plummer

blocksfor shafts having diameters of 2+ to1+ mm, inclusive. The standard rangealso covers other variants, for e-ample,housings with drilled and tapped holes for

lubrication nipples or condition monitoring


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vlvesvlves

%ntroduction%ntroduction&& A nonreturn valve is one which

will automatically close and preventsteam from the main line from

"owing back into the boiler if thepressure in the latter should fallbelow that in the steam line. !heretwo or more boilers are connectedto one steam line, a nonreturnvalve shall be provided in the mainsteam connection of each boiler,

either in addition to or combinedwith the re ular sto


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&'() *+

'team0#as power plants

T,re tubes

oilers

*nection moldin#


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/on&0eturn alves allow airow inonly one direction ./on&0eturn alvesare available in tube&to&tube style with fractional inch push&to&connect ends, and threaded end style

with fractional inch push&to&connect endsand 3/F or /PT threads. ll featureglass&reinforced, nylon composite bodywith nickel&plated brass base. 'orking

pressure is 1451#4 psi and workingtemperature is "+51+6F. alves aresuitable as safety device in compressedair circuits.


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Application to InjectionApplication to InjectionMoldingMolding

The screw of the plasticating unit of anin*ection molding machine typically consistsof a single stage, single ighted conveyingscrew with a non&return valve at the end.

8i-ing sections are usually not incorporatedinto the screw design. 9ne reason for this isthe fact that most plasticating units arelatively short% the typical length&to&diameter

ratio is 2+:1 in in*ection molding machines.


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convenient method to improve themi-ing capability of the plasticatingunit of an ;88 is to design the non&

return valvesuch that it has mi-ingcapability. mi-ing technology

developed for single screw e-truders.


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8i-ing is not only important in e-trusion, it isequally important in in*ection molding. =0>mi-ing elements can be added to an in*ectionscrew. 8ost in*ection screws have a non&return

valveat the end of the screw to prevent themolten plastic owing back into the screw duringin*ection. ;t is possible to incorporate mi-ingcapability into the non&return valveto combinetwo functions within one device.


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'hen the screw moves forward,

the check ring is dragged to the

most rearward position against thecheck ring seat forming a seal. ;nthis position the valve is closed andthe plastic melt is thus preventedfrom leaking back into the screwchannel during in*ection. )ecauseof the relative movement between

the check ring and the stop, stops


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8i-ing capability can be designed into the slide ring valve bylocating mi-ing pins on the inside of the slide ring as shownin !gure . The pins are elongated in the a-ial direction toachieve an acceleration of the uid as it is passing betweentwo pins. The resulting elongational ow results in e(ective

dispersive mi-ing. The same elongated pins are also locatedon the outside of the stop, resulting in a second e-posure toelongational ow with further dispersive mi-ing action. Thelarge number of pins located on the slide ring and stopinduce a large number of splitting and reorientation events,

resulting in e?cient distributive mi-ing action.

CRD non-return valve

for injection molding


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The /'non&return

valveprovides aconvenient and coste?cient method toimprove the mi-ing

capability of in*ectionmolding screws.@ood mi-ing actioncan be incorporated

simply by e-changingthe conventional non&return valvewith a/'non&return valve Solid model of CRD-NRV


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Fuel Non-Return Valve

ow to replace the non&return valve on thefuel pump. lways take standard safety

precautions when dealing with petrol.Symptoms

=ar may take a few turns of the engine tostart. This is more noticeable when the

engine is warm. /o fuel pressure left in the fuel rail whenthe engine is o(.

0i# Aaguar part !ts into the fuel pump. The fuel

pump is located on the rear chassis.


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>isconnect battery. Aack rear left hand side. Put car on a-le stands.

0emove left hand wheel.

Bou should be able to follow fuel line back to the

fuel !lter C*ust forward of the wheel archD andthen to the fuel pump which is behind wheelarch.

@et new valve ready with new copper washer on

smaller end. Place container to catch petrolbelow pump.

9riginal valves required 1Emm spanner. Fuelhose requires 1mm spanner. /ew valve

required 1mm spanner.


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>onIt worry if you see something fall out of theend. Bou can place pipe up on spring and it wonItpush out too much petrol. owever, valve end will bynow be spewing petrol all over the place. Plug end.opefully, because you have already loosened it you

will be able to unscrew the valve by hand CitIs a bittight to get your hand in so a Jdry runJ may be inorderD

s soon as itIs out, drop it and pick up the new oneto stem the ow of petrol. The new one ';HH stop thepetrol coming out as soon as you have a couple ofturns made.


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The bits that might fall out of the valve is aspring and ball which form the old non&returnvalve.

The purpose of loosening the valve is so thatyou donIt have to spend time trying to undo thevalve with fuel leaking out.

Tighten up valve, holding pump body to

stop rotation. Then re&attach fuel hose etc.


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Non-Return Valve 802Piston Tpe

1. 'esigned to assist in sealingduring low reverse pressures,using springs which areselected to give minimal

accumulation and lift pressuresthroughout the range. Sealing isbetter than (.1 bar2 in reverse"ow.

). Available in 3 dierent sizesranging from '4 3 to 5( 61789to )9:.

*. &perating pressures rangefrom ( to 8(( bar2

Mterils of Constru"tionNon Return Valve 802 Piston type


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802 Non-Return Valve

Space Envelope803 Screw Down Non Return Valve

Space Envelope


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S/=! '&!4 4&4-/=T>/4?A@?=

Primarily designed tofunction as a non&returnvalve, but has the capacityto hold the valve closed. The

K+" combines all thefeatures of both the K+1 andthe K+2 valves into one unit,making it ideal for situationswhere it is not practical toinstall two valves or wheresafety is paramount.

Materials o! "onstruction

=artridges&


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REFERENCES

/C!*+( )/*+G 5N.D.BHATT6

/C!*+( )/*+G 5N.SIDHESWAR6

www.#oo#le.com


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REFERENCES

/C!*+( )('*G+ 5KHURI6

/C!*+( )/*+G 5N.SIDHESWAR6

www.#oo#le.com

Documents

166982613 Machine Drawing