2.1 Common Damage Forms of Rubber Conveying Belts
Normal wear: wear during normal use
Abnormal wear: breakages by slippage, edge wear by off-tracking and local wear
Vertical scratches: scratches on rubber belts along the direction of movement
Lateral tension breakages: The lateral breakages of rubber belts during operation
Interface breakages: Cracks or breakages at the interface of rubber belts
Delamination: the rubber covering layer or load bearing layer separated from the core layer
2.2 Cause Analyses of Damage to Rubber Conveying Belts
2.2.1 Cause analysis of rapid normal wear
The cleaner (scraper) on the machine head is too tight, causing significant friction on the belt and resulting in rapid wear on the working surface of the belt. The pressure on the non-working surfaces of each no-load section of the belt is too high, resulting in rapid wear of the non-working surface of the belt. The size of the protective skin on the feeding port of the conveyor is too long or too wide, causing significant friction between the protective skin and the belt, resulting in rapid wear of the belt. The particle size and composition of transported materials may impact the wear of the belt. Many carrier rollers cannot operate normally, resulting in rapid wear of the belt. The upper carrier roller causes faster wear on the non-working surface, while the lower carrier roller causes faster wear on the working surface.
2.2.2 Cause analysis of abnormal wear
(1) Belt wear caused by roller slipping
When the belt passes through the rollers, there is severe relative sliding friction between the belt and the roller, which is called slipping. Slipping does not necessarily exist at the transmission roller, but it causes the greatest damage and formation to the belt at the transmission rollers. The direct reason for the belt slipping on the transmission rollers is that the frictional force between the transmission rollers and the belt is insufficient to drive the belt to operate normally.
- Common causes:
The belt tension is insufficient
The weight of the materials transported on the belt is severely overloaded
The belt gets stuck
Transmission roller adhesive is damaged
The main reason for the belt slipping on the bend pulley is that the frictional force of the belt on the bend pulley is not sufficient to drive the pulley to rotate.
- Common causes:
The bend pulley bearing is damaged, causing excessive rotating resistance
The bend pulley is stuck by materials
(2) The belt is off-tracking, causing edge wear
The belt deviates from one or both sides perpendicular to the direction of movement during operation, causing itself to run out of the center position of the roller.
- Common causes:
The belt is tensioned improperly, resulting in different tension forces on the tail rollers or on both sides of the tensioning roller
The belt bonding interface is not in correct position
The conveyor is not installed straight
Improper installation or adjustment of the feeding port may cause material overload and impact, resulting in the belt deviating in the opposite direction
Roller surface quality problem
Surface quality issues or inclined installation of the carrier roller
Quality issues with the belt, uneven stretch
(3) Local wear on the belt
Local patchy wear or stripe wear on the belt occurs during the operation of the rubber belt.
- Common causes:
The air film on the air cushion belt conveyor is uneven
Local quality problem with the rubber belt
Partial carrier rollers get stuck
Large pieces of material get stuck in the sweeping mechanism of the return section or in the end of the machine.
2.2.3 Vertical scratches on rubber belts
Foreign materials cause scratches on the belt (mainly due to the presence of iron tools, wooden sticks, or larger block materials stuck in funnels or guide grooves, causing scratches on the belt).
The funnel and guide groove of the rubber conveying belt are damaged, causing scratches on the belt
The cleaner(scraper) of the rubber conveyor or the cleaner on the no-load section is too tight, causing scratches on the belt
Damaged carrier rollers and rollers of the rubber conveying belt cause scratches on the belt
2.2.4 Lateral tension breakages of rubber belts
Due to the entry of blocky materials into the roller that is not in contact with the working surface of the belt, the blocky materials exert significant support on the belt when it passes through the roller, resulting in lateral breakages of the belt
Due to the excessive impact force of foreign materials on the belt surface, the belt experiences lateral breakages
Due to the tension exerted on the belt exceeding the tension it can withstand, the belt experiences lateral breakages
2.2.5 Interface breakages
Due to quality issues with the adhesive interface, the adhesive rubber belt connection point becomes “empty”, causing delamination and detachment of the belt in the middle of the interface
Insufficient length of the adhesive interface results in insufficient tension of the belt at that location, leading to cracking of the adhesive interface
Reduced strength at the belt interface due to poor temperature control of the adhesive connection
2.2.6 Delamination of the braid of rubber belts
Due to poor quality of the rubber belt, the adhesive layer of the belt is separated from the woven fabric layer
Due to the impact of production quality or unreasonable use of on-site carrier rollers, the woven fabric of the belt separates from the woven fabric layer
Wrong choice of belt, not using high-temperature or oil-resistant belts in high
temperature or oily environments.
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Post Time: 2024-08-22