The drag chain is a device that binds cables or wires or air pressure pipes and oil pressure pipes to facilitate their rotation and movement. Energy chains are used to carry and protect cables, hydraulic pipes, gas pipes and other medium pipes, and to regulate the movement of medium pipes to avoid mutual entanglement, twisting and damage. Drag chains are spliced together by flexible unit chain links, and are widely used in platforms that require mobile power supply, such as: machine tools, construction machinery, welding and cutting equipment, electronics industry, logistics storage equipment, conveying equipment, injection molding industry, automobile manufacturing and other industries.