This product has four major functions: lifting, transportation, space storage and scientific management. The track is designed on the principle of building blocks, and the whole line can be assembled with standard tracks. Therefore, the track line layout is flexible and adaptable, and the whole machine utilizes the lifting station, which can not only form a plane conveying network, but also form a multi-layer three-dimensional conveying system. The load car has simple structure, convenient maintenance, energy saving, low noise, no pollution, and flexible maneuverability. The number of load cars can be increased or decreased according to the production program and process changes to meet the requirements of use. In addition, on the paint pretreatment, assembly, and material conveying lines, the truck does not need to climb and downhill, and the lifting characteristics of the chain hoist can be used to directly put the workpiece into the solution tank for cleaning (or other processes) At the same time, in order to ensure the cleaning quality of the workpiece, the workpiece can be swayed in the solution tank, which is beyond the reach of the chain conveyor. Self-hoist conveyor line