When the rubber conveyor belt is in normal operation, the belt speed is not less than 95% of the roller speed. If the friction between the roller and the conveyor belt is insufficient, the conveyor belt is prone to slippage. There are many reasons for the insufficient friction between the roller and the conveyor belt. Common ones are: insufficient tension, load start, and insufficient friction coefficient on the surface of the roller. The reasons for insufficient tension are: insufficient tensioning stroke, insufficient weight of the counterweight, too long conveyor belt, etc.;
The reasons for the insufficient friction coefficient of the roller surface are: the surface of the roller is too much worn, the belt is too wet or sticky, and the surface of the belt is stuck with material (easy to be swelled by water).