Common problems in the use of conveyor belts

When the majority of users use conveyor belts, due to the variety of conveyor belts and different manufacturers, there is the same problem, that is, the conveyor belt is easy to be damaged. The following interpretation is as follows:
1. Why are the conveyor belt joints easy to crack and disconnect?
The strength at the joint of the conveyor belt is lower than that of the normal belt body. Generally, when mechanically connected, the joint strength can only reach 40-50% of the belt body strength. When the quality of the cold glue method is better, the joint strength can reach 60-70%, while the hot glue joint strength can reach 80-90% ( The joint method is correct and there is no quality defect). Because the strength of the joint is relatively low, if the bonding method is incorrect, the strength of the joint will be even lower, such as cutting, damage to the next layer of cloth during grinding, excessive grinding, insufficient lap length, insufficient number of steps, glued joints The rubber used is not good or has self-sulfur failure, the steel wire rope is excessively polished, the steel wire rope is rusted, etc., the strength of the joint will be greatly reduced, and the joint is prone to disconnection during use.
In addition, if the conveyor belt does not use sealing glue, or the direction of the glue joint is wrong, the joint part is prone to cracking (surface glue part).
2. What is the reason for the slippage of the conveyor belt?
When the conveyor belt is running normally, the belt speed should not be lower than 95% of the roller speed. If the friction between the roller and the conveyor belt is not enough, the conveyor belt is prone to slipping. There are many reasons for insufficient friction between the roller and the conveyor belt. The common ones are: insufficient tension, load start, insufficient friction coefficient of the roller surface, etc.
Reasons for insufficient tension include: insufficient tension stroke, insufficient counterweight weight, too long conveyor belt, etc.;
The reasons for the insufficient friction coefficient of the roller surface are: the rubber covering on the roller surface wears too much, the belt body is too wet or sticky with lubricating oil, and the belt body surface is sticky with materials (easy to be swelled by water).
3. Is the long conveyor belt easy to deviate?
During the operation of the conveyor belt, sometimes there will be a phenomenon of deviation. In general, the deviation of the conveyor belt due to the problems of the conveyor belt itself is rare, and the deviation of the conveyor belt is mainly caused by the conveyor. Because the rollers of the conveyor are not parallel, the brackets are not vertical, and the roller rotation is not flexible, it can cause the conveyor belt to deviate. For a relatively short conveyor belt, due to the inflexible rotation of the one-sided roller and other factors, the possibility of deviation of the conveyor belt is relatively high, and for a long conveyor belt, due to the increase in the number of idlers, the single The asymmetry of the side effects will be reduced, so less misalignment will manifest itself on the conveyor belt.
Of course, there are exceptions in individual cases, such as: when the self-aligning roller is not flexible enough to swing or is fixed at an angle, the surface of the roller is not clean enough, etc., which can cause the conveyor belt to deviate.
4. After the conveyor belt is stretched, can it be retracted?
The conveyor belt will elongate during use, part of which is elastic elongation, which can return to its original shape after the external force is removed, and the other part is the elongation of the contraction of the skeleton material, which cannot be restored. Among the commonly used fabric core conveyor belts, the elongation of the EP conveyor belt is relatively small, while the elongation of the NN conveyor belt is relatively large, and in the process of use, the creep of the NN conveyor belt is relatively large due to the force of the nylon fiber. In the middle, the elongation ratio is increased, and because of the creep of the fiber, after the external force is removed, the amount that can shrink back is much smaller than the elongation.