The conveying line is mainly to complete the conveying task of its materials. In the site surrounding the warehouse, production workshop and packaging workshop, there are conveyor chains composed of many belt conveyors, roller conveyors, etc., which are connected end to end to form a continuous conveyor line. There are and path fork devices, elevators and ground conveying lines at the entrance and exit of the material. In this way, in the warehouse, production workshop and packaging workshop, a circulating conveyor line system that can reach various production positions smoothly and at the same time is closed. All related materials, parts, components and finished products used in the production process