Hydraulic transmission equipment usually consists of four parts: power, execution, control, and assistance. As a hydraulic mechanism that achieves linear reciprocating motion or less than 360 degree reciprocating swing motion, hydraulic cylinders have a simple structure and reliable operation, and are widely used as the main executive components in hydraulic systems. When the piston and piston rod move under hydraulic drive, they have a large amount of momentum. When they enter the end cap and the bottom of the cylinder, they will cause mechanical collisions, resulting in significant impact pressure and noise.