Quality Problems Caused & Corrections – Standard Resource Inc.

The direction of the cause and solution for common conveyor belt problems

What’s the problem?	Why does it happen?	The solution
1. Belt edge wear and broken excessively	1) Off-center loading	Adjust the chute to place load on the center of the belt and discharge material in direction of the belt moving.
	2) Material Spillage and cumulation	Improve loading and conveying conditions, install cleaning devices, and improve maintenance.
	3) Bowed belt	For a new belt, this condition should disappear soon, otherwise, the belt must be straightened or replaced. In the meanwhile, should check the storage and handling situation.
	4) Belt-hitting structure	Install training idlers on carrying and return sides.
	5) Belt too rigid for adequate troughing	Install a more flexible belt.
2. Stripping of cover	1) Impact of materials on belt	Reduce impact by improving chute design, and installing impact idlers or impact beds.
	2) Skirt board improperly adjusted or of the wrong martial	Adjust Skirt Board support to a minimum of 25 mm between the metal and belt with a gap increasing in direction of belt travel. Kindly note: use a skirt board rubber (not an old belt).
3. Severe pulley cover wear	1) Material trapped between belt and pulley	Install scraper on return run ahead of tail pulley.
	2) Spillage on the drive pulley	Increase tension, lag drive pulley, and increase the arc of contact.
	3) Sticking Idlers.	Free idlers and improve maintenance.
4. Cover harden or crack	1) Heat or chemical use condition	Use a belt designed for the specific condition.
	2) Improper storage or handling	Refer to proper storage and handling instructions.
5. Cover softening or swells in spots	1) Contamination by spilled grease, over-lubrication of idlers	Improve housekeeping, reduce the quantity of grease used, and check grease seals.
6. Cover bubbles	1) Cover cuts or very small punctures	Make spot repair with a vulcanizer or self-curing repair material.
7. Short breaks in carcass parallel to belt edge, start the break in carcass	1) Impact of material on the belt.	Reduce impact by improving chute design, and installing impact idlers or impact beds.
	2) Material trapped between belt and pulley	Install scraper on return run ahead of tail pulley.
8. Transverse breaks	1) Belt edges folding up on the structure	Readjust idlers in the affected area, and install limit switches to provide more clearance.
	2) Improper transition between the troughed belt and terminal pulley	Adjust transition as recommended.
	3) Severe convex, vertical curve.	Decrease idler spacing in the curve, increase curve radius
9. Lengthways carcass break with covers intact.	1) Belt running off center and folding over	Use limit switches and determine the reasons for the belt running out.
10. Belt breaks at or behind fasteners, fasteners pullout	1) Wrong type of fastener, fasteners too tight or too loose	Use proper fasteners, and set up a schedule for regular fastener inspection.
	2)Fastener plates too long for pulley size	Replace with smaller fasteners, and increase pulley size.
	3) Tension too high	Increase speed, reduce friction decrease tension by increasing the arc of contact.
11. Ply separation	1) Pulley too small	Use larger diameter pulleys.
	2) Heat or chemical use condition	Use a belt designed for the specific condition.
	3) Too many reverse bends	Use a more flexible belt.
	4) Mildew or dust penetration into the carcass	Prevent cuts, and arrange for immediate repairs.
12. Particular section of the belt runs to one side at all points on the conveyor	1) Belt not joined squarely	Remove the affected splice and re-splice.