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Problem Solving
|
COMPLAINT |
CAUSE in order of probable occurrence |
|||||
|
Belt runs off at tail pulley |
7 |
15 |
14 |
17 |
21 |
- |
|
Entire belt runs off at all points of the line |
26 |
17 |
15 |
21 |
4 |
16 |
|
One belt section runs off at all points of the line |
2 |
11 |
1 |
- |
- |
- |
|
Belt runs off at head pulley |
15 |
22 |
21 |
16 |
- |
- |
|
Belt runs to one side throughout entire length at specific idlers |
15 |
16 |
21 |
- |
- |
- |
|
Belt slip |
19 |
7 |
21 |
14 |
22 |
- |
|
Belt slip on starting |
19 |
7 |
22 |
10 |
- |
- |
|
Excessive belt stretch |
13 |
10 |
21 |
6 |
9 |
8 |
|
Belt breaks at or behind fasteners: fasteners tear loose |
2 |
23 |
13 |
22 |
20 |
10 |
|
Vulcanized splice separation |
13 |
23 |
10 |
20 |
2 |
9 |
|
COMPLAINT |
CAUSE in order of probable occurrence |
|||||
|
Excessive wear, including rips, gouges, ruptures and tears |
12 |
25 |
17 |
21 |
8 |
5 |
| Excessive bottom cover wear | 21 | 14 | 5 | 19 | 20 | 22 |
| Excessive edge wear, broken edges | 26 | 4 | 17 | 8 | 1 | 21 |
| Cover swells in spots or streaks | 8 | - | - | - | - | - |
| Belt hardens or cracks | 8 | 23 | 22 | 18 | - | - |
| Covers become checked or brittle | 8 | 18 | - | - | - | - |
| Longitudinal grooving or cracking of top cover | 27 | 14 | 21 | 12 | - | - |
| Longitudinal grooving or cracking of bottom cover | 14 | 21 | 22 | - | - | - |
| Fabric decay, carcass cracks, ruptures, gouges (soft spots in belt) | 12 | 20 | 5 | 10 | 8 | 24 |
| Ply separation | 13 | 23 | 11 | 8 | 3 | - |
1. Belt bowed - Avoid telescoping belt rolls or storing them in damp locations.* A new belt should straighten out when "broken in" or it must be replaced.
2. Belt improperly spliced or wrong fasteners - Use correct fasteners. Retighten after running for a short while. If improperly spliced, remove belt splice and make new splice.* Set up regular inspection schedule.
3. Belt speed too fast - Reduce belt speed.
4. Belt strained on one side - Allow time for new belt to "break in." If belt does not break in properly or is not new, remove strained section and splice in a new piece. *
5. Breaker strip missing or inadequate - When service is lost, install belt with proper breaker strip.
6. Counterweight too heavy - Recalculate weight required and adjust counterweight accordingly.* Reduce takeup tension to point of slip, then tighten slightly.
7. Counterweight too light - Recalculate weight required and adjust counterweight or screw takeup accordingly.
8. Damage by abrasives, acid, chemicals, beat, mildew, oil - Use belt designed for specific condition. For abrasive materials working into cuts and between plies, make spot repairs with cold patch or with permanent repair patch. Seal metal fasteners or replace with vulcanized step splice. Enclose belt line for protection against rain, snow, or sun. Don't over lubricate idlers.
9. Differential speed wrong on dual pulleys - Make necessary adjustment.*
10. Drive underbelted - Recalculate maximum belt tensions and select correct belt. If line is over-extended, consider using two-flight system with transfer point. If carcass is not rigid enough for load, install belt with proper flexibility when service is lost.
11. Edge worn or broken - Repair belt edge. Remove badly worn or out-of-square section and splice in a new piece.
12. Excessive impact of material on belt or fasteners - Use correctly designed chutes and baffles. Make vulcanized splices. Install impact idlers. Where possible, load fines first. Where material is trapped under skirts, adjust skirt boards to minimum clearance or install cushioning idlers to hold belt against skirts.*
13. Excessive tension - Recalculate and adjust tension. Use vulcanized splice within recommended limits.
14. Frozen idlers - Free idlers. Lubricate. Improve maintenance. (Don't over-lubricate.)
15. Idlers or pulleys out-of-square with centre line of conveyor - Realign. Install limit switches for greater safety.
16. Idlers improperly placed - Relocate idlers or insert additional idlers spaced to support belt.*
17. Improper loading, spillage - Feed should be in direction of belt travel and at belt speed, centred on the belt. Control flow with feeders, chutes and skirtboards.
18. Improper storage or handling - Refer to the manufacturer for storage and handling tips.
19. Insufficient traction between belt and pulley - Increase wrap with snub pulleys. Lag drive pulley. In wet conditions, use grooved lagging. Install correct cleaning devices for safety. See item 7, above.
20. Material between belt and pulley - Use skirtboards properly. Remove accumulation. Improve maintenance.
21. Material build-up - Remove accumulation. Install cleaning devices, scrapers, and inverted ---'V'decking.* Improve housekeeping.
22. Pulley lagging worn - Replace worn pulley lagging. Use Grooved Lagging for wet conditions. Tighten loose and protruding bolts.
23. Pulleys too small - Use larger-diameter pulleys.
24. Radius of convex vertical curve too small - Increase radius by vertical realignment of idlers to prevent excessive edge tension.
25. Relative loading velocity too high or too low - Adjust chutes or correct belt speed. Consider use of impact idlers.
26. Side loading - Load in direction of belt travel, in centre of conveyor.
27. Skirts improperly placed - Install skirtboards so that they do not rub against belt.
* Consult us for additional recommendations and procedures, we would be glad to assist you.