89184571 conveyor belt troubleshooting

8/11/2019 89184571 Conveyor Belt Troubleshooting

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TROUBLESHOOTING

The following tables list problems sometimes encountered and suggests possible solutions.

The causes are in the left-hand column and the corrections in the right hand column.

Conveyor belt problems causes and correctons

!" Conveyor runnn# to one sde at a #ven pont on structure$

A) One or more idlers immediately

preceding trouble point not square (at

right angles) to longitudinal axis of belt.

A.1) Utilising slots in idler stand, foot rotateentire idler assemblies in same direction as

for the steering wheel of an automobile, to

steer belt back tocentre.

B) on!eyor frame or structure croo"ed.B.1) Stretch string along to determine extent and

make correction.

) One or more idler stands not centred

under belt. C.1) Same as B.1 above.

#) $tic"ing idlers. .1) !m"rove maintenance and lubrication.

%) &hen the run-off begins on a terminal

pulley' it follows that terminal pulley is

out of alignment. ote that a con!eyor belt shifts to the low or short side.

#.1) $e%align "ulle&.

) Build-up of material on idlers and

pulleys.

'.1) !m"rove maintenance.

'.() !nstall scra"ers or other cleaning device.

*) $tructure not le!el and belt tends to shift to low side. .1) *evel structure.

%" &artcular secton o' conveyor belt runs to one sde at all ponts on a conveyor

A) Belt not +oined squarely. A.1) Cut ends s+uare and re fasten.

B) Bowed belt. B.1) Avoid bad storage conditions such as

telesco"ed rolls or one edge close to dam"

ground or wall.B.() ith a new belt, this condition should

disa""ear as soon as the belt has o"erated

under full load and tension, and becomes

-broken in-.B.) Use self%aligning idlers, "articularl& on

return run a""roaching tail "ulle& to obtain

central loading.B./) !n rare instances belt must be re"laced.

(" Conveyor belt runs to one sde 'or lon# dstance alon# bed

A) ,oad being placed on belt off-centre. A.1) Ad0ust chute and loading conditions so as to

"lace load in centre of belt.

) $ee .% See 1.#


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) $ee .* See 1.

)" Belt s erratc *'ollo+s no pattern o' per'ormance,

A) Belt too stiff to train. A.1) Use self%aligning idlers.

A.() ilt troughing idlers forward, but not more

that ( degrees.A.) Use more troughable belt.

-" Severe +ear on pulley sde o' conveyor belt

A.) $lippage on dri!e pulley. A.1) !ncrease the tension through screw take%u"

or more counterweight.A.() *ag drive "ulle&.

A.) !ncrease the arc of contact on the drive

"ulle& with a snub "ulle&.

B) $pillage of material which is ground

between belt and pulley or whichbuilds up at loading point until belt is

dragging.

B.1) !m"rove loading conditions with a chute.

B.() !f belt is overloaded, increase belt s"eed or decrease feed onto belt.

B.) install decking between to" and return runs.B./) !nstall "loughs or scra"ers in front of tail

"ulle& onreturn runB.2 3revent leakage of abrasive fines at fasteners

b& changing to "late fasteners or vulcanised

s"lice.

) $tic"ing idlers C.1) !m"rove maintenance and lubrication.

#) Bolt head protruding abo!e pulley

lagging.

.1) ighten bolts.

.() $e"lace worn lagging.

.) Use vulcanised%on lagging.

%) %xcessi!e tilt to troughing idlers. #.1) Ad0ust to not more that ( degrees from line

"er"endicular to belt.." E/cessve stretc0 n conveyor

A) Tension too high. A.1) !ncrease s"eed, kee"ing tonnage same.A.() $educe tonnage at same s"eed.

A.) $educe friction with better maintenance and

re"lacing of worn out and fro4en idlers.A./) ecrease tension b& im"roving drive with

lagging, increase arc contact and

counterweight take%u".A.2) $e"lace with heavier belt.

Above is based on the assum"tion that

ade+uate take%u" is available.1" Belt s0rn2s

A) Belt absorbing moisture. A.1) 3ut in extra "iece, installing with take%u" halfwa& down.

3" Len#t0+se #ou#n# or strppn# o' top cover

A) $"irt board seals too stiff and pressed

against belt.

A.1) Use more "liable seals.

A.() Ad0ust to relieve "ressure on belt.


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B) %xcessi!e space between belt and s"irtseals.

B.1) Ad0ust seals to minimum clearance.

) etal sides of chute or s"irts too close

to belt and gap not increasing indirection of tra!el.

C.1) Ad0ust to at least 25mm ga" between metal

and belt and have ga" increasing in directionof travel so as to "revent material 0amming at

this "oint.4" Len#t0+se #ou#n# or strppn# o' top cover *Cont",

#) Belt span"s down under impact atloading point' allowing material to be

trapped under s"irts.

.1) !nstall cushion or "neumatic idlers to holdbelt

u" against skirts.

%) aterial hanging under bac" panel. #.1) !m"rove loading to "revent s"illage or installbaffle.

) /amming of material in chute. '.1) iden chute.

!5" S0ort brea2s n carcass parallel to belt ed#e and star brea2s n carcass

A) 0mpact of lumps failing on belt. A.1) $educe im"act.

A.() Use cushion idlers.

B) aterial trapped between belt andpulley.

B.1) !nstall "lows or scra"ers on return run aheadof

tail "ulle&.

!!" Transverse brea2s at belt ed#es

A) Belt edges folding up on structure dueto wander or pressing too hard against

side guide idlers.

A.1) See troubles 61), 6(), 6) and 6/).A.() !nstall limit switches to sto" belt in cases of

extreme shifting.

B) ildew. B.1) $e"lace with 7!8'!8!9: belt.

) inal idler before head pulley locatedtoo close or too high in respect to head

pulley.

C.1) Ad0ust idler "osition in accordance withnormal

design "ractice.

!%" Cover blsters or sand blstersA) o!er cuts or !ery small co!er

punctures allow fine particles of 1sand1to wor" under co!er and cut co!er

away from carcass.

A.1) ;ake s"ot re"air with vulcaniser or -cold-

"atches.A.() !n severe and re"eating cases refer all details

to 7!8'!8!9: for anal&sis.

!(" Belt rses up o'' trou#0n# dlers6 bo+n# to+ards load

A) Oil contamination in material. A.1) $emove source of oil, if "ossible.A.() o eke out the life of "resent belt, cut

longitudinal grooves in cover with t&re

grooving tool to relieve transverse "ressure

exerted b& swelling rubber.

A.) 'or "ro"er selection of re"lacement belt,send in sam"le of oil to determine best oil

resisting com"ounds.

!)" Cover s+ells n spots6 or lnes o' s+elln# on pulley sde concdent +t0 7uncton or

trou#0n# dler rolls"

A) $pilled oil or grease. A.1) Better housekee"ing.

B) O!er-lubrication of top run idlers. B.1) $educe +uantit& of lubricant used.

!-" E/cessve top cover +ear6 un'orm around belt

A) #irty return rolls. A.1) !nstall cleaning devices.

A.() ash belt.


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A.) Use rubber disc return idlers.

B) o!er quality too low. B.1) $e"lace with better belt.

) 2ile up of spilled material at tail pulley. C.1) !m"rove housekee"ing and loading.

#) $lide loading' or poor loading' i.e.

speed of deli!ery of material too slow.

.1) $edesign chute to make load feed onto belt in

same direction as belt runs and at

a""roximatel& same s"eed as belt.%) %xcessi!e sag between idlers causingload to wor" and shuffle on belt as it

passes o!er idlers.

#.1) !ncrease tension where it is unnecessaril&low.

#.() $educe idler s"acing.

#.) $e"lace with belt of heavier carcass.

!." 8asteners pulln# out

A) ildew. A.1) $e"lace with 7!8'!8!9: belt.

B) &rong type of fastener or fasteners

not tight.

B.1) $e fasten belt and set u" schedule for fre+uent

fastener ins"ection. $e%tighten new fastenersafter a few hours run.

) Tension too high. C.1) Check tension in belt and if too high, see item

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89184571 conveyor belt troubleshooting

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