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Home | Quality Control >>Testing Lab & Test Report
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Quality Problems Caused & Corrections

Quality Problems Caused & Corrections

Direction of the cause and solution for common conveyor belt problems

What's the problem?Why it happens?The solution
1. Belt edge wear and broken excessively 1) Off centre loadingAdjust chute to place load on centre of belt and discharge material in direction of belt moving.
2) Material Spillage and cumulationImprove loading and conveying conditions, install cleaning devices, improve maintenance.
3) Bowed beltFor new belt this condition should disappear soon, otherwise the belt must be straightened or replaced. In the meanwhile, should check storage and handling situation.
4) Belt hitting structureInstall training idlers on carrying and return sides.
5) Belt too rigid for adequate troughingInstall a more flexible belt.
2. Stripping of cover1) Impact of materials on beltReduce impact by improving chute design, install impact idlers or impact bed.
2) Skirt board improperly adjusted or of wrong martialAdjust Skirt Board support to minimum 25 mm between metal and belt with gap increasing in direction of belt travel. Kindly note: use skirt board rubber (not old belt).
3. Severe pulley cover wear1) Material trapped between belt and pulleyInstall scraper on return run ahead of tail pulley.
2) Spillage on drive pulleyIncrease tension, lag drive pulley, increase arc of contact.
3) Sticking Idlers.Free idlers and improve maintenance.
4. Cover harden or crack1) Heat or chemical use conditionUse belt designed for specific condition.
2) Improper storage or handlingRefer proper storage and handling instructions.
5. Cover softening or swells in spots1) Contamination by spilled grease, overlubrication of idlersImprove house-keeping, reduce quantity of grease used, check grease seals.
6. Cover bubbles1) Cover cuts or very small punctures Make spot repair with vulcanizer or self curing repair material.
7. Short breaks in carcass parallel to belt edge, start break in carcass1) Impact of material on belt.Reduce impact by improving chute design, install impact idlers or impact bed.
2) Material trapped between belt and pulleyInstall scraper on return run ahead of tail pulley.
8. Transverse breaks1) Belt edges folding up on structureReadjust idlers in affected area, install limit switches provide more clearance.
2) Improper transition between troughed belt and terminal pulleyAdjust transition as recommended.
3) Severe convex, vertical curve.Decrease idler spacing in curve, increase curve radius
9. Lengthways carcass break with covers intact.1) Belt running off centre and folding overUse limit switches and determine reasons for belt running out.
10. Belt breaks at or behind fasteners, fasteners pullout1) Wrong type of fastener, fasteners too tight or too looseUse proper fasteners, set up schedule for regular fastener inspection.
2)Fastener plates too long for pulley sizeReplace with smaller fasteners, increase pulley size.
3) Tension too highIncrease speed, reduce friction decrease tension by increase arc of contact. 
11. Ply separation1) Pulley too smallUse larger diameter pulleys.
2) Heat or chemical use conditionUse belt designed for specific condition.
3) Too many reverse bendsUse more flexible belt.
4) Mildew or dust penetration into carcassPrevent cuts, arrange for immediate repairs.
12. Particular section of belt runs to one side at all points on conveyor1) Belt not joined squarelyRemove affected splice and re-splice.

 

What's the problem?Why it happens?The solution
Broken
1. Foreign object in drive
2. underdesigned drive
3. sharp band caused tensile cord damage
1. shield drive
2. redesign drive
3. follow proper storage and handling procedures
Excessive sidewall wear
1. worn of damaged sheaves
2. Misalignment or non-rigid centers
3. Bent flange
1. Replace of sheaves
2. Align drive or reinforce mounting
3. Straighten flange
Crack
1. high temperature
2. sheave diameter too small
3. slippage
1. remove heat source
2. redesign drive
3. retension drive
Cord Failure
1. high temperature
2. sheave diameter too small
1. remove heat source
2. redesign drive
Broken
1. Foreign object in drive
2. underdesigned drive
3. sharp band caused tensile cord damage
1. shield drive
2. redesign drive
3. follow proper storage and handling procedures
Wear
1. the tension force is not enough
2. Belt is too wide
1. make the belt fastened
2. Fit the belt with proper steps
Crack
1. high temperature
2. sheave diameter too small
1. remove heat source
2. redesign drive
Rob failure
Wrong Equipping Belt or DriverMake sure that Belt is fixed well
Belt Noise1. belt slip
2. misaligned sheaves
3. wrong belt type
1. retension
2. realign sheaves
3. replace cut edge with wrapped belt

Home | Quality Control >>Testing Lab & Test Report
Onsite Quality Control
Package
Quality Problems Caused & Corrections

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