Double-insurance anti-retreating mechanism

The utility model discloses a double-insurance anti-retreating mechanism which comprises a sliding block, the sliding block is provided with a hydraulic cylinder capable of pushing the sliding block to move back and forth, the sliding block is of an L-shaped structure, a guide sliding plate connected with the L-shaped structure in a sliding mode is arranged at the bottom of the L-shaped structure, and a first insurance device and a second insurance device are arranged at the left end and the right end of the sliding block respectively. The moving direction of the first safety device is perpendicular to the moving direction of the second safety device, the first safety device is used for limiting the sliding block to move in the left-right direction, and the second safety device further limits the sliding block to move towards the right side. The safety device has the advantages that the structure is simple, the operation is convenient, and the first safety device and the second safety device are arranged, so