Polishing device for piston rod machining

The utility model discloses a polishing device for piston rod machining, and relates to the technical field of piston rod machining. The grinding device for piston rod machining comprises a base, a machine shell is slidably connected to the top end of the base, a fixing shaft is fixedly connected to the outer wall of the machine shell, a clamping assembly is arranged on the fixing shaft, a piston rod is detachably installed on the fixing shaft, and a grinding machine is arranged at the top end of the base. The clamping assembly comprises a pedal type inflator pump, a valve core, an air pipe, a fixed ring, an air bag, a movable ring, a triangular plate and a sliding block. According to the device, air is input into a fixed ring and an air bag in a foot stepping mode of a pedal type inflator pump, a movable ring is pushed by the expanded air bag to move and extrude a triangular plate, so that the triangular plate extrudes and clamps a piston rod, the overall cost is low, clamping of the piston rod can be consta