The output power of the motor is transmitted from the reducer to the crushing roller, and the external load directly acts on the crushing roller, acting on the reducer through the coupling. The coupling manufacturer produces a large amount of large coal gangue during the crushing process due to the complex working conditions of the crusher. Large blocks of coal gangue fall periodically from high places, forming periodic impacts on the crushing roller. Periodic peak impacts can easily cause gear loss, gear fatigue damage, bearing damage, and outer box cracking.

The two shafts connected by the coupling, due to manufacturing and installation errors, deformation after bearing, and the influence of temperature changes, can cause changes in the relative position of the two shafts, and often cannot determine strict alignment. The diaphragm of the coupling is fastened to the shaft sleeve with a pin, which generally does not loosen or cause backlash between the diaphragm and the shaft sleeve. This characteristic is somewhat similar to a bellows coupling, but in fact, the way the coupling transmits torque is similar.

The performance of the coupling to adapt to a certain range of relative displacement should be avoided during assembly, and flexible couplings should be used to compensate for these displacements. Generally, power machines are connected to the working machine through diaphragm couplings. Generally, for large rotating equipment with high requirements for two axis alignment and high shaft stiffness, interference fit is used for positioning, and high control requirements for interference amount are required.

The rated torque of the coupling is still large, and most of the changes have various types of transmitted kinetic energy, reaching the average operation under various power system standards. In the situation where the driving force is constantly working, there is a regular operation, and this series of operating forces will be greater, which can correctly reflect high elasticity and the ability to undertake work.