Lock pin assembly

The locking assembly comprises a cover body, a rotating piece, a connecting rod, a safety hook and a spring bolt, a rotating part of the rotating piece is rotatably inserted into the cover body, a connecting column of the rotating piece is rotatably inserted into a first part of the connecting rod, and a transmission column of the safety hook is rotatably inserted into a second part of the connecting rod; a containing cavity is formed in the spring bolt, the safety hook is movably located in the containing cavity, the limiting part of the safety hook movably abuts against the limiting openingof the spring bolt, the spring bolt is movably clamped to the cover body, and the limiting wall of the cover body covers the limiting opening. The rotating piece drives the spring bolt and the safetyhook to move through the first part, the second part and the limiting part in sequence, so that the safety hook protrudes out of the containing cavity and hooks the door holder, complex gear transmission in the prior art is re