Power and free chain conveying system for coating assembly line

The invention relates to a power and free chain conveying system for a coating assembly line. The power and free chain conveying system comprises a power and free chain; the bearing device comprises at least one bearing trolley, and the bearing trolley can be in transmission connection with the power and free chain; the bearing device is provided with a workpiece hanging allowing area for hanging a workpiece to be coated in a limited mode, and the workpiece hanging allowing area has an area area. A stopper; the visual identification assembly comprises a visual identifier, and the visual identifier can collect visual information of the pendant allowing area; the controller is programmed to be capable of executing the following procedures that the contour area of each workpiece to be coated in the allowable hanging part area is obtained based on the visual information; based on the ratio of the sum of the contour areas of all the workpieces to be coated in the allowable pendant area to the area of the area, an