The coupling is widely used. In general, as long as there is a motor or reducer, the coupling should be used. Large couplings are used more in metallurgical machinery. Different couplings have different functions. The functions of various couplings are as follows: first, they connect the shafts of prime mover and working machinery and transmit torque. 2、 It can properly compensate the radial, axial and angular errors of the two shafts caused by manufacturing, installation and other factors. 3、 Safety coupling when overload occurs, the coupling slips or the pin is disconnected to protect the working machinery. 4、 The elastic coupling also has the functions of buffering, damping and improving the dynamic performance of the shafting