Elastic pin coupling in the process of working is used to connect the two shafts can rotate together with mechanical equipment, transfer torque and movement of a mechanical transmission device. It is impossible for the connected two axes to be aligned, and the misalignment is caused by the manufacturing error, installation error, deformation after load and temperature change of the unit. So the coupling can not only transmit torque and movement, but also absorb the misalignment of the two axes, and the additional impact on the unit should be as small as possible.

The elastic pin coupling compensates the relative displacement of the two axes by the elastic deformation of the elastic element, and can also cushion the vibration and avoid resonance. Elastic components are divided into metal elastic components and non-metal elastic components. Metal elastic element coupling includes spring coupling, snake spring coupling, bellows coupling, film disc coupling and diaphragm coupling. Non-metallic elastic element coupling still has more applications including elastic pin coupling, rubber block coupling, tire coupling and so on. Metal elastic components are stronger than non-metal elastic components, large load transfer capacity, and there is no aging problem, long service life, affected by temperature is small, especially suitable for use in continuous operation of industrial process power equipment.

The form of elastic pin coupling is more, the coupling transmission check is need to be divided into three different categories according to the function and the principle of use: ordinary coupling, safety coupling, special coupling. Safety coupling is to increase the safety mechanism on the basis of the ordinary coupling, once the torque overload, can make the transmission interrupt or limit the transmission of torque, so as to protect the important parts of the machine from damage. Special couplings are couplings connected by a non-mechanical means, such as hydraulic, pneumatic or magnetic transmission couplings.