Rotating arm structure with self-locking function and opening and closing mechanism

The utility model discloses a tumbler structure with a self-locking function and an opening and closing mechanism, the tumbler structure comprises a tumbler, a through groove is arranged in the tumbler, a lock seat which is not connected with and attached to the inner wall of the through groove is arranged in the through groove, and a sliding groove for a locking device to slide is arranged in the lock seat. Rotating arm limiting devices are arranged on the two sides of the outer wall of the rotating arm, the limiting devices have buffering compressible strokes, and the limiting devices are connected with the lock seat through through holes in the rotating arm. The lock seat is arranged in the through groove of the rotating arm, the lock seat is connected with the locking mechanism through the sliding groove of the lock seat, the impact force generated when the locking device passes through a dead point is counteracted through the gap between the lock seat and the rotating arm and the elastic compression of t