Totally-enclosed stainless steel spring lock

A totally-enclosed stainless steel spring lock comprises a lock beam (1), a plunger latch (2), a container (3), a stop sleeve (12), a slot (15), a steel ball retainer (16), a steel ball (13), a spring (14), an inner positioning sleeve (5), an outer positioning sleeve (6), a clamping ring (4), a spring (8), a right cover plate (7), a left cover plate (19), a lock head (17), a sunk screw (18), an alarm hole (9), a cover (10) and a rivet (11); the U-shaped lock beam (1) is provided with a long foot and a short foot the excircles which are respectively provided with a clearing corner groove and an arc groove; the upper plane of the plunger latch (2) is provided with two holes corresponding to the centers of the two feet, the bottom surface of the (2) is provided with the alarm hole (9); the upper and lower planes at the right end of the container (3) are respectively provided with a semi-circle gap for locking the inner positioning sleeve (5), the left of the (3) is provided with a through hole concentric with th