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What's the problem?
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Why it happens?
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The solution
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1. Belt edge wear and broken
excessively
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1) Off centre loading
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Adjust chute to place load on centre of belt and discharge material in
direction of belt moving.
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2) Material Spillage and cumulation
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Improve loading and conveying conditions, install cleaning devices,
improve maintenance.
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3) Bowed belt
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For new belt this condition should disappear soon, otherwise the belt
must be straightened or replaced. In the meanwhile, should check storage and handling situation.
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4) Belt hitting structure
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Install training idlers on carrying and return sides.
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5) Belt too rigid for adequate troughing
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Install a more flexible belt.
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2. Stripping of cover
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1) Impact of materials on belt
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Reduce impact by improving chute design, install impact idlers or impact
bed.
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2) Skirt board improperly adjusted or of wrong martial
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Adjust 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).
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3. Severe pulley cover wear
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1) Material trapped between belt and pulley
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Install scraper on return run ahead of tail pulley.
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2) Spillage on drive pulley
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Increase tension, lag drive pulley, increase arc of contact.
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3) Sticking Idlers.
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Free idlers and improve maintenance.
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4. Cover harden or crack
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1) Heat or chemical use condition
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Use belt designed for specific condition.
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2) Improper storage or handling
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Refer proper storage and handling instructions.
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5. Cover softening or swells in spots
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1) Contamination by spilled grease, overlubrication of idlers
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Improve house-keeping, reduce quantity of grease used, check grease
seals.
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6. Cover bubbles
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1) Cover cuts or very small punctures
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Make spot repair with vulcanizer or self curing repair material.
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7. Short breaks in carcass parallel to
belt edge, start break in carcass
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1) Impact of material on belt.
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Reduce impact by improving chute design, install impact idlers or impact
bed.
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2) Material trapped between belt and pulley
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Install scraper on return run ahead of tail pulley.
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8. Transverse breaks
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1) Belt edges folding up on structure
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Readjust idlers in affected area, install limit switches provide more
clearance.
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2) Improper transition between troughed belt and terminal pulley
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Adjust transition as recommended.
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3) Severe convex, vertical curve.
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Decrease idler spacing in curve, increase curve radius
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9. Lengthways carcass break with covers
intact.
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1) Belt running off centre and folding over
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Use limit switches and determine reasons for belt running out.
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10. Belt breaks at or behind fasteners,
fasteners pullout
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1) Wrong type of fastener, fasteners too tight or too loose
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Use proper fasteners, set up schedule for regular fastener inspection.
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2)Fastener plates too long for pulley size
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Replace with smaller fasteners, increase pulley size.
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3) Tension too high
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Increase speed, reduce friction decrease tension by increase arc of
contact.
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11. Ply separation
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1) Pulley too small
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Use larger diameter pulleys.
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2) Heat or chemical use condition
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Use belt designed for specific condition.
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3) Too many reverse bends
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Use more flexible belt.
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4) Mildew or dust penetration into carcass
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Prevent cuts, arrange for immediate repairs.
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12. Particular section of belt runs to
one side at all points on conveyor
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1) Belt not joined squarely
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Remove affected splice and re-splice.
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