Problem |
Why? |
What to do? |
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| Belt running to one side at a given point |
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Idler(s) behind a trouble point are not at right angle |
Advance the end(s) of the idler(s) in the direction of belt travel. |
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Blocked idler(s) |
Lubricate or replace idler(s). |
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Crooked conveyor structure |
Make corrections. |
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Buildup of materials on idlers |
Clean, and improve maintenance. |
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| Particular section of belt running to one side at all points |
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Belt not joined squarely |
Refasten resp. resplice. |
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Bowed belt |
If the textile belt is new, it should straighten out after a couple of days under full load. |
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| Belt runs to one side for a longer distance |
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Idlers or pulleys out of square |
Readjust idlers |
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Off-center material feeding |
Adjust chute and loading conditions. More... |
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| Belt runs off-center around the tail pulley and in the loading area |
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Install training idlers on the return run prior to tail pulley. |
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| Premature wear or abrasion of belt bottom cover |
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Dirty, frozen or misaligned idlers |
Clean; improve maintenance. |
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Transition length too short |
Check transition lengths and extend, if possible. |
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Slippage on drive pulley |
Check pulley for correct lagging. Consider to use ceramic. |
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| Belt slips |
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Insufficient traction between belt and pulley |
Increase belt wrap (contact length between belt and pulleys); improve belt cleaning. |
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Worn pulley lagging |
Replace lagging. Consider to use ceramic. |
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Counterweight too light or blocked |
Add counterweight or increase screw take-up tension or eliminate blocking. |
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| Excessive elongation of belt. |
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Tension too high. |
Reduce tonnage; reduce counterweight. |
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Belt strength too low. |
Replace by stronger belt. |
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High elongation carcass. |
Replace by lower elongation belt, for instance with polyester warp. |
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| Grooving, gouging of top cover |
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Skirt board seals are pressed against the belt |
Leave enough clearance b etween seal and belt. |
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Skirt board seals too hard |
Use proper sealing material (no old conveyor belts...). |
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Material impact |
Improve chute design for smoother feeding; install impact idlers. |
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Material trapped under seals |
Install cushion idlers to hold belt up towards skirts. |
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| Grooving, gouging of bottom cover |
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Sticking or frozen idlers |
Free the idlers and lubricate them. Or even a broken idler? |
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Material buildup |
Install or improve cleaning devices, avoid spillage, improve maintenance. |
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Slippage |
Lag drive pulley, increase tension, increase arc of contact. |
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Worn pulley lagging |
Replace pulley lagging. |
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| Hard and/or cracking cover |
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Compound too hard |
Too many sulfur bridges. No repair possible. |
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Ageing |
Sulfur bridges replaced by oxygen bridges. No repair possible. |
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| Holes or breaks in belt |
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Impact of material falling onto belt |
Reduce impact; use cushion idlers; use belt with impact protection system; repair the spots. |
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