A lock member includes a housing, a movement body, and an elastic member. The housing includes an open groove at an inner wall of the housing. A bottom of the open groove is provided with a movement surface. An end of the movement surface proximal to an opening of the open groove is a locking end, and an end of the movement surface distal to the opening of the open groove is an unlocking end. The movement body is provided in the open groove and moveable along the movement surface. The elastic member is provided in the open groove and configured to maintain the movement body at the locking end or the unlocking end of the movement surface.