Wheel milling window fixture

A wheel milling window fixture, composed of a bottom plate, guide blocks, clamping slide blocks, mounting keys, hydraulic cylinders, hydraulic pipelines, connecting blocks, pressure claws, first rotating shafts, second rotating shafts, end face blocks, a mandrel, a mandrel seat, a locking jackscrew, a mandrel height adjusting post, a mandrel guide post, a mandrel guide post locking screw, a locking ring, circumferential positioning posts and circumferential slide blocks, wherein the bottom plate is fixed on a machine tool, the four guide blocks are fixed on the bottom plate, the clamping slide blocks slide in slots of the guide blocks, each end face block is fixed in a clamping slide block, the end face blocks and the clamping slide blocks are fixed on the bottom plate, the hydraulic cylinders are fixed on the clamping slide blocks by the mounting keys, the hydraulic pipelines are fixed on the hydraulic cylinders, the connecting blocks are fixed at the extension ends of the hydraulic cylinders, the pressure claws are articulated into holes of the connecting blocks via the first rotating shafts and simultaneously articulated to the end face blocks via the second rotating shafts, the mandrel seat is fixed on the bottom plate, the mandrel height adjusting post is in clearance fit in the hole of the mandrel seat, the mandrel guide post is in clearance fit in the hole of the mandrel height adjusting post, the locking ring and the mandrel guide post are locked by the mandrel guide post locking screw, the mandrel is fixed on the mandrel height adjusting post, and the circumferential positioning posts are fixed on the circumferential slide blocks.