The conveyor system of the turnover machine uses the electrophoresis skid as the carrier and the turnover machine as the conveying unit to transport the workpiece to complete the pre-treatment and electrophoresis process, including degreasing, water washing, silane, electrophoresis and other surface treatment processes, which provide the basis for the subsequent processes. 　　Advantages: The workpiece can be transported independently through the tank with the roof facing down, which can effectively eliminate air bubbles in the car body, reduce the amount of tank liquid carried, and drain quickly.