A circumferential positioning device of automobile hub having rotary positioning seat, transition seat, bearing, positioning pin, positioning cylinder, bearing, base frame, main rotating shaft with sliding spline, coupling assembly, link snap-gauge assembly, lead screw, connecting bolt, nut, servo motor, lower bracket of main rotating shaft, small bracket of belt servo motor, belt pulley servo motor, small belt pulley axle, small belt pulley, belt, large belt pulley. The device in the present invention two radial grooves passing through the center that are formed in the bottom surface of the flange of the hub, correspond to the spoke direction on the facade of the hub and are just matched with the two radial bosses passing through the center on the top face of the positioning seat to achieve a positioning purpose.

A conveyor and process for transporting products, wherein a carrier with an associated product holder can be moved along a conveying path by means of a conveyor element. In a processing position, the carrier can be aligned by means of first alignment elements, and second alignment elements are provided for aligning the product holder for disengagement from the carrier.

A conveyor and process for transporting products, wherein a carrier with an associated product holder can be moved along a conveying path by means of a conveyor element. In a processing position, the carrier can be aligned by means of first alignment elements, and second alignment elements are provided for aligning the product holder for disengagement from the carrier.