When the lock needs to be closed, push the wrench on the lock ring by hand, and the lock ring will overcome the pull of the large tension spring and extend along the track of the lock shell to the outside of the lock body to enter the other mouth. At this time, the lock is at the tail slot of the lock ring. The lock moves downward along the guide slot under the action of the small tension spring and enters the tail slot of the lock beam. The lock ring is locked by the lock. When the lock moves downward, the lock also drives the eccentric shaft of the lock core to rotate, making the lock core turn back to its original position, and the key can be removed.