Guide: Conveying belt (conveying belt), also known as conveyor belt, is used in belt conveyor belts to carry and transport materials, rubber and fiber, metal composite products, or plastic and fabric composite products. Conveyor belts are widely used in cement, coking, metallurgy, chemical, steel and other industries where the conveying distance is short and the conveying volume is small.
I. Overview of the conveyor belt
(1) Tape is one of the main components of the belt conveyor. It runs through the entire length of the conveyor. The price is relatively expensive and accounts for about 50% of the cost of the conveyor.
(2) The composition of the conveyor tape: the upper and lower cover rubber and the core are composed.
(3) Classification of conveyor belt: According to different cores, it is divided into ordinary fabric conveyor belt and steel wire rope conveyor belt; according to different rubber surface components: it is divided into heat-resistant, cold-resistant, acid-proof, alkali-resistant, oil-resistant, flame-retardant and other conveyor belts.
Ordinary fabric conveyor belt:
Natural rubber is used as a rubber surface, and cotton canvas or nylon canvas is used as the core. The cotton canvas is used as the core tape, the longitudinal tear strength is 56KN/m per layer, which belongs to ordinary tape; the nylon tape is used as the core tape, and the longitudinal tear strength is 140KN/m per layer, which belongs to strong tape. The main technical parameters are bandwidth B, canvas layer number Z, working surface and non-working surface covering glue thickness.
Wire rope conveyor belt:
It is made of steel wire core with core and outer cover rubber. Technical parameters: bandwidth, wire rope diameter, number of roots, wire rope gap, upper and lower cover rubber thickness.
Wire rope conveyor belt is compared with ordinary conveyor belt:
Advantages: high strength, small elongation, good groove formation and long service life.
Its shortcomings: the overall no horizontal wire, the low horizontal strength, easy to cause longitudinal scratching, when the drum and the tape between the coal and other easy to cause the steel wire rope to lengthen or even break, so the tape cleaner should pay enough attention.
Patterned tape:
The rubber surface of the working rubber surface is arranged in a certain pattern, and the other is the same as the ordinary tape. Advantages: The inclination of the conveyor can be increased to 28 ° C ~ 35 ° C.
Second, the form and cause of damage of the conveyor belt
(1) Reasons for longitudinal tearing of the conveyor belt
The vibration shock causes the fastener to loosen and fall off, causing the falling coal pipe liner and the guide plate to fall; the foreign matter is mixed into the material, the foreign matter is hard and angular, and the falling coal pipe is blocked and squeezed; the idler roller is damaged, and the roller frame is drawn Injury; the conveyor belt is severely deflected and hung by the frame; the cleaner is wound into the drum (return sweeper), the bolts are loose, and there is a bouncing precursor.
(2) Causes of conveyor belt cracking
1. Due to the limitation of space size, the conveyor belt has many bending times;
2. When the joint is vulcanized, it has been vulcanized twice or more for various reasons.
(3) Causes of vulcanization joint tearing
1. The diameter of the reversing drum is small, and the bending stress of the conveyor belt is large;
2, the quality of the vulcanized joint is poor, especially if the vulcanization is more than twice, the strength of the joint is obviously reduced, or the canvas 3, the layer is cut, or the wear is leaked during the bonding, where the strength is reduced;
4. For the reversible conveyor, since it can only be in one direction when it is lapped up and down, it is easy to be scratched by the sharp corners of the sweeper, unloader and other equipment on the belt;
5. The working cycle of the conveyor is short, the starting is frequent, and the instantaneous tension is large.
(4) Causes of damage to the rubber surface
1. The gap between the guide groove liner and the tape is not suitable, causing abnormal wear or foreign matter embedded in the gap, causing abnormal wear or scratch.
2. The material flow rate at the guide trough is inconsistent with the conveyor belt speed, and the drop is large, which accelerates the wear of the rubber surface.
3. The roller is damaged, causing abnormal wear or scratch of the tape.
4, illegal operation, welding slag burns during maintenance.
5, the sweeper is scratched.
6, the tape slips, it will also cause abnormal wear of the tape.
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