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Principle Analysis of Friction
In the PVC conveyor belt transmission, the friction between the belt and the pulley is small, and the PVC conveyor belt will slip on the pulley, which can not drive the normal operation of the machine. In this case, the belt can be tightened and the belt to the pulley can be increased. Pressure to increase the friction between the belt and the pulley. Below we discuss two types of belt drive, starting with the analysis of friction, to see which type of transmission is good.

(1) The transmission mode shown in Figure 5-8. The driving wheel rotates counterclockwise. Because the belt does not slip during the transmission process, the friction between the belt and the pulley is static friction. The direction of the static friction is opposite to the direction of the belt relative to the pulley. The "relative motion trend direction" at this time is the direction in which the belt moves relative to the pulley when there is no friction between the belt and the pulley. It is now known that the driving wheel is rotated counterclockwise, so that the direction of relative movement of the belt relative to the pulley is clockwise, whereby it can be concluded that the direction of the static friction acting on the belt by the driving wheel is counterclockwise. Under the action of static friction, the pvc conveyor belt rotates counterclockwise. For the driven wheel on the right, the direction of static friction acting on the belt is clockwise. Under the action of the static friction of the two pulleys, the belt above the wheel is tensioned, and the belt under the wheel is in a relaxed state, so the wrap angle of the belt surrounding each pulley is less than π.

(2) The transmission mode shown in Figure 5-9. Different from a transmission method, the driving wheel and the driven wheel exchange position, and the driving direction of the driving wheel is still counterclockwise. According to the same principle, it can be known that the frictional force acting on the belt by the driving wheel is counterclockwise, and the frictional force acting on the belt by the driven wheel is clockwise. The characteristic of this type of transmission is that the belt above the wheel is in a relaxed state and the belt below the wheel is in tension. Therefore, the wrap angle of the belt surrounding the pulley is greater than π.

In the transmission process of the pvc conveyor belt, the larger the wrap angle, the greater the friction between the belt and the pulley. This can ensure that the belt does not slip during the transmission process, improve the belt transmission efficiency and reduce the energy loss. According to the analysis, the second transmission method is better than the one transmission method.




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