System for machining and positioning automobile hub and production line for intelligent cleaning and precision machining

A system for positioning an automobile hub, the system comprising an upper mounting plate and a lower mounting plate that are connected in an up-down direction and spaced apart by a specific distance, wherein at least three U-shaped blocks are circumferentially fixed on a top surface of the upper mounting plate, an L-shaped support is mounted between every two adjacent U-shaped blocks, a screw-equipped ball head is disposed on the L-shaped support, the L-shaped support is driven by a first driving apparatus to move radially along the upper mounting plate, a slidable chuck is disposed in each U-shaped block, a push rod assembly is connected to a bottom of each chuck, the push rod assembly is driven by a second driving apparatus to move radially along the upper mounting plate together with the chuck, wedges of a quantity of the push rod assemblies are circumferentially fixed on a top surface of the lower mounting plate, the wedges are driven by a third driving apparatus to move radially along the lower mounting plate, and inclined surfaces of the wedges are mated with bottoms of the push rod assemblies.