Abstract:As a guide wheel for Light rail, the horizontal wheel has a relatively high scrap rate while the light rail running. And then, the ways of traditional manual removing and installing horizontal rim are of low efficiency, high cost, a certain risk and other shortcomings. In order to ensure the safety and efficiency of the horizontal wheel rim disassembly and installation, this paper designs the PLCbased control system on the basis of designing and completing the mechanical device of the light rail horizontal wheel disassembly. According to the above design, three modes, including automatic, semiautomatic, manual control can be used to complete the removal and installation of the horizontal wheel rim of the light rail.