Clamping device for pen point machining

The clamping device for pen point machining comprises an installation base and a fixing disc, the top of the installation base is fixedly connected with a connecting column, penetrating holes are formed in the top of the installation base and the top of the connecting column, a plurality of sliding holes are formed in the outer wall of the circumference of the connecting column, and sliding pipes are connected between the sliding holes in a sliding mode. A plurality of grooves are formed in the top of the circumferential outer wall of the connecting column, rotating blocks are rotationally connected to the inner walls of the bottoms of the grooves, clamping blocks are fixedly connected to one sides of the rotating blocks, extrusion blocks are fixedly connected to one sides of the clamping blocks, an electric push rod is fixedly connected to the top of the fixing disc, and a push plate is fixedly connected to one end of the electric push rod; the top of the push plate makes contact with the bottom of the slidi