Coupler buffer device is one of the most basic and important parts of vehicles, which is used to connect vehicles with vehicles, locomotives or motor cars, transfer traction and braking force, and reduce longitudinal impact. The coupler buffer device consists of coupler, buffer, coupler tail frame, slave plate, etc. , installed on the traction beam at the end of the chassis. In order to ensure the safety and reliability of vehicle couplers and the interchangeability of coupler buffer device installation. Function of coupler: Coupler refers to the hooks at both ends of the train wagon or locomotive, which has the functions of connection, traction and buffering. Coupler is a vehicle component used to realize the connection between locomotive and vehicle, transmit traction and impact force, and keep a certain distance between vehicles. Function and classification of buffers: classification: According to the structural characteristics and working principle of buffers, general buffers can be divided into friction buffers, rubber buffers and hydraulic buffers. Function: The buffer is used to reduce the longitudinal impact and vibration caused by the change of locomotive traction or the collision between vehicles during starting, braking and shunting operations. Buffer has the function of dispersing the impact and vibration between vehicles, thus reducing the damage to the car body structure and loaded goods.