Secondary clamping device for wheel

A secondary clamping device for a wheel, comprising a shaft sleeve, a linear bearing, a positioning pin, a spring A, a floating shaft, a nut, a pressure plate, a pull rod, a floating column, a spring B, a bearing end cover, bearings, a spacing ring, a gland and a base, wherein the two bearings and the spacing ring are closed in the base by the bearing end cover, and the two bearings are connected by the spacing ring;

• the shaft sleeve is mounted on the bearings, the linear bearing and the gland are fixed on the shaft sleeve, the floating shaft passes through the linear bearing and the spring A in sequence, the positioning pin is fixed at the top of the floating shaft, the upper part of the positioning pin is of a positive cone structure, two ends of the spring A are respectively connected with the positioning pin and the linear bearing, and the positioning pin is configured to move up and down under the action of the spring A;
• the pull rod is fixed on the gland, the pull rod passes through the spring B and an inner hole of the floating column, the outer wall of the floating column is connected with the inner hole of the shaft sleeve, the upper end face of the floating column is of a positive conical surface structure, two ends of the spring B are respectively connected with the gland and the floating column, and the floating column is configured to float up and down under the action of the spring B;
• and the pressure plate is mounted on the pull rod by the nut;
• before actual use, the nut and the pressure plate are detached from the pull rod, and in actual use, when a wheel is put on the device, a central hole and a bolt hole of the wheel are respectively aligned with the floating column and the floating shaft, the upper conical surface of the floating column and the upper conical surface of the floating shaft are completely attached to the central hole and the bolt hole of the wheel under the gravity of the wheel and the actions of the spring A and the spring B, then the pressure plate is compressed onto the front side of the wheel by the nut so that the wheel moves down, finally, the flange surface of the wheel is in contact with the upper end face of the floating column, so far, the clamping operation of the wheel is completed, and machining of the wheel begins.