Lock mechanism

The utility model discloses a lock mechanism which comprises a first connecting rod and a second connecting rod which can rotate relative to each other. The second connecting rod is sleeved with the lock, the lock can slide along the second connecting rod, and at least part of the lock can slide to the first connecting rod; a first groove is formed in the first connecting rod, and a first ball and a first spring are embedded in the first groove; the lock is provided with a through hole matched with the first ball, so that after the lock slides to a preset position, at least part of the first ball is ejected into the through hole, but the first ball is not ejected out of the through hole. The locking mechanism is simple in structure, the locking block is provided with a fixing point after locking and unlocking, the occupied space is small, and the locking mechanism is suitable for locking after the connecting rod mechanism is aligned. 本申请公开了一种锁机构，包括：第一连杆、第二连杆，所述第一连杆、第二连杆之间相互可转动；锁，套设所述第二连杆上，所述锁可沿所述第二连杆滑动，所述锁可至少