Buffering device used for controlling movement speed of actuator cylinder

The invention discloses a buffering device for controlling the movement speed of an actuator cylinder. The reliability of a locking device mechanism can be improved. The buffering device is achieved through the following technical scheme that an upper locking cavity is communicated with a damping pipe, and an intercepting ring groove is formed in the circumference of a sliding section of the damping pipe; when a piston rod extends downwards, hydraulic oil enters a blind hole cavity of the piston rod along the damping pipe, after the blind hole cavity is filled with the hydraulic oil, the hydraulic oil slowly flows upwards into the upper locking cavity along the intercepting ring groove in the damping pipe, the hydraulic pressure of the upper locking cavity is slowly increased, and the piston rod is pushed to move under the action of the hydraulic pressure; when the piston rod retracts, pressure of the unlocking cavity extrudes the piston rod, the piston rod extrudes the hydraulic oil in the upper locking cavi