Hydraulic jack provided with mechanical self-locking protecting device and control method

The invention discloses a hydraulic jack provided with a mechanical self-locking protecting device and a control method. The hydraulic jack provided with the mechanical self-locking protecting devicecomprises the mechanical self-locking protecting device and a jack body, wherein the mechanical self-locking protecting device comprises a fixing support which is fixedly mounted on the outer wall ofa cylinder barrel of the jack body, wherein a servo motor and a speed reducer are mounted on the fixing support; an output shaft of the servo motor is connected to the speed reducer; a pinion is mounted at an output shaft of the speed reducer and is matched with a tooth-shaped nut to enable gear engaging transmission; the tooth-shaped nut sleeves a piston rod of the jack body; and a limiting clamping buckle is mounted on the outer wall of the cylinder barrel of the jack body through a bolt. With the adoption of the hydraulic jack provided with the mechanical self-locking protecting device, theproblems in the background