Pneumatic clamp for automatic ceramic rod grinding

The invention provides a pneumatic clamp for automatic ceramic rod grinding. The pneumatic clamp is characterized in that two axial blind grooves are formed in the outer wall of an inner rotary shaft and correspond to two radial through holes in an outer rotary shaft correspondingly, the inner rotary shaft is assembled in the outer rotary shaft, and the extending lengths of the two ends of the inner rotary shaft are equal; three T-shaped grooves are evenly formed in the outer surface of the U-shaped bottom surface of a fixing sleeve; after three clamping claws are assembled into the T-shaped grooves of the fixing sleeve through through grooves in the two side surfaces of the clamping claws correspondingly, wedge blocks are assembled on the side surface of one side of the inner surface of the U-shaped bottom surface of the fixing sleeve, and springs are arranged between the wedge blocks and the fixing sleeve; tapered holes of connecting tubes of pistons are assembled into the fixing sleeve towards the directio