Towing chains are divided into steel towing chains and plastic towing chains. Steel tow chains are made of steel and aluminum, and can be customized. Plastic tow chains are also called engineering plastic tow chains and tank chains. Towing chains can be divided into three types according to the use environment and requirements: bridge towing chain, fully enclosed towing chain and semi-closed towing chain. Rectangular metal hoses, protective sleeves, corrugated pipes and metal hoses can also be included in towing chain protection and mobile power supply products. Towing chain is used in reciprocating motion, which can pull and protect the built-in cables, oil pipes, gas pipes and water pipes. Towing chain has been widely used in CNC machine tools, electronic equipment, glass machinery, injection molding machine manipulator, handling machinery, plastic machinery, lifting equipment, woodworking machinery, automobile industry, industrial vehicles, metal processing machines, machine tools, casting machinery, port equipment and other industries. 3 The structure of the plastic towing chain is edited. The towing chain looks like a tank chain and consists of many unit links, and the links can rotate freely. The inner height, outer height and pitch of the same series of towing chains are the same, and the inner width and bending radius r of the towing chain can be selected differently. The unit chain link consists of left and right chain plates and upper and lower cover plates. Each section of the towing chain can be opened, which is convenient to assemble and disassemble without threading. After opening the cover plate, cables, oil pipes, gas pipes and water pipes can be put into the towing chain. Each section of the towing chain can be designed to be openable for easy installation and maintenance. Low noise during exercise, wear resistance, and high speed movement. In addition, a separator can be provided to separate the space in the chain as required.