Wheel fixture

A wheel clamp comprising a clamping jaw, a first positioning pull rod, a balance block housing, a first guide shaft, a deflection block, a balance block, a base, pins, second positioning pull rods, a protection ring, airtight bases, airtight ejector rods, airtight support blocks, second guide shafts, airtight covers, pressure plates, first pins, first screws, second screws, a chuck body, a tightening screw, a third screw a first O ring, fourth screws, slotted pan head set screws, second O rings, third O rings, a fifth screw, a main shaft, a sixth screw, a spring, first hexagon head hole screws, a second hexagon head hole screw, seventh screws, eighth screws, and ninth screws, wherein the base is connected to the main shaft by the fifth screw, the chuck body is fixed to the base by the third screw, the tightening screw connects the chuck body with the main shaft, and the protection ring presses the first O ring to the gap between the chuck body and the base, plays a sealing role and is tightened with the sixth screw;

• the lower surfaces of the six groups of second positioning pull rods are engaged with the toothed surface of the chuck body and tightened with two second screws respectively, the first positioning pull rod is connected and fixed to the second positioning pull rods by the two pins, the clamping jaw is connected and fixed to the first positioning pull rod by the two first screws and the two first pins, the balance block housing is connected and fixed to the base by the seventh screws, the first guide shaft passes through a through hole of the balance block housing and passes through the deflection block, two ends of the balance block housing restrict the axial movement of the first guide shaft via screws, the balance block is mounted in an inner groove of the balance block housing, the two second guide shafts pass through the through holes of the balance block and enter a bottom hole of the balance block housing, the second guide shafts are tightened on corresponding threaded holes of the balance block housing via the two first hexagon head hole screws, and the axial movement of the two second guide shafts is restricted;
• the spring is arranged in a bottom hole of the balance block, the second hexagon head hole screw is tightened on a corresponding threaded hole of the balance block housing to restrict the axial movement of the spring, the two pressure plates are mounted at the two ends of the first positioning pull rod, and the pressure plates are connected and fixed to the balance block housing by a group of eighth screws to restrict the movement of the first positioning pull rod in the axial direction of the main shaft;
• three groups of airtight mechanisms are uniformly distributed in the circumferential direction of the upper surface of the base, wherein the airtight base is connected and fixed to the base by a group of ninth screws, the third O ring is mounted in a lower groove of the airtight base, the airtight ejector rod is mounted in a circular hole of the airtight base, two slotted pan head set screws are used to restrict the rotation of the airtight ejector rod, the second O ring is mounted between the airtight base and the airtight ejector rod, the airtight support block is connected and fixed to the upper surface of the airtight ejector rod by a fourth screw, and the airtight cover seals the air passage inside the base through a group of ninth screws and a third O ring.