The pneumatic lock comprises a lock body, positioning shaft sleeves are arranged at the two ends of the lock body respectively, core shafts are arranged in the positioning shaft sleeves in a sliding fit mode, pistons are further arranged on the
peripheral walls of the positioning shaft sleeves in a sliding mode, the lock body is divided into an
air cavity and a containing cavity through the pistons, a friction sleeve is arranged on the core shafts and located between the positioning shaft sleeves in a sleeving mode, and the friction sleeve is in clearance fit with the core shafts. A bearing is further matched between the friction sleeve and the lock body and comprises an inner ring, an outer ring and a
retainer, the friction sleeve is sleeved with the inner ring, fracture grooves are formed in the friction sleeve and the inner ring, the
retainer is arranged between the inner ring and the outer ring, a shaft clamp spring is arranged on the outer ring, a first spring abuts against the position between the shaft clamp spring and the lock body, and an inner hole of the outer ring is arranged in a taper hole shape. The end, with the large hole
diameter, of the inner hole of the outer ring abuts against the
piston, and a second spring is further arranged between the
retainer and the outer ring in an abutting mode. The structure is simple, the production and
processing are convenient, the use is reliable, and the use effect is good.