The production line composed of the double speed chain assembly line is usually called the double speed chain conveyor of the gravity conveying system, which is mainly used for the material transportation in the assembly and processing production line. Its conveying principle is to use the speed increasing function of the double speed chain to make the tooling plate bearing the goods on it run quickly and stop at the corresponding operation position through the stopper; Or complete the stacking action and the functions of moving, transposing and line changing by corresponding instructions. In conclusion, the speed chain is an important component in the field of power transmission, and its efficient and reliable operation is critical to the performance of many industrial and transportation applications.It is widely used in the production lines of various electronic and electrical appliances, electromechanical and other industries. The most commonly used industries of the speed chain assembly line are: computer display production line, computer host production line, notebook computer assembly line, air conditioning production line, television assembly line, microwave oven assembly line, printer assembly line, fax machine assembly line, audio amplifier production line, and engine assembly line. Speed chains are designed to provide high-speed transmission with reduced loads and smaller sprockets. They are ideal for applications that require fast and efficient power transmission but do not require heavy loads or high torque.