Brief introduction to the main classification of drag chains: According to the material, it can be divided into: steel drag chain, steel and aluminum drag chain, nylon drag chain, plastic drag chain, etc. According to the form can be divided into: bridge drag chain, multi-row bridge drag chain, fully enclosed drag chain, silent drag chain, tank chain, etc. According to the requirements of the use environment: oil-proof, waterproof, anti-iron cutting, garbage pollution, high temperature resistance, friction resistance, need to be lengthened, need to be load-bearing, no noise, hidden cable pipe, etc. Plastic nylon drag chain assembly form: bridge type, fully closed, semi-closed. Main parameters of the drag chain: Inner height: Select the thickest one of the built-in cables, tubing, trachea, water pipes, etc. as the reference height, plus only 10% less height space as the inner height of the drag chain. If the overlap is the actual height after overlapping, use the reference height as the reference height. Inner width: Choose thicker wires, water pipes, gas pipes, tubing, etc., and use the sum of the outer diameters as a reference for the inner width of the drag chain, and leave at least 10% of the width space. Bending radius: Select the largest bending radius of the built-in cable, tubing, trachea, water pipe, etc. as the reference value of the silkworm, and leave more than 10% of the space.