Problem Solving
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COMPLAINT |
CAUSE in order of probable occurrence |
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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. |
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SPLICING