The drag chain cable is softer than the general cable, but it is not as soft as possible. Its insulation has strong mechanical fatigue resistance, and all have a certain hardness; and some flexible wires have thin conductors, and their insulation is also very good. Soft, small radius installation wiring and low frequency bending are no problem, but there is still a big gap between the mechanical bending life and the dedicated drag chain cable ratio. Looking at the conductor, the diameter of the conductor of the drag chain cable is generally 0.1mm (measured by the vernier caliper), 0.08mm and 0.05mm; in order to ensure the stability of the physical and electrical properties of the conductor: generally use the multi-wire drawing 4N conductor, the conductor is bright and bright, and has good toughness; The resistivity is low, and the wire does not heat up under the rated load for a long time; Looking at the insulation, the concentricity is very high, the insulation thickness is uniform; the insulation is resistant to adhesion, high strength; good toughness; the safest and most direct method is high-speed bending test: the existing coordinate platform or connecting rod bending device can be used. Some drag chain cables have some special requirements, which can be identified by looking at the materials: 1. Tensile resistance requirements: add nylon or DuPont Kevlar (kevlar, commonly known as bulletproof wire, the strength is several times that of steel wire); 2. Wear-resistant and oil-resistant, the wear-resistant outer skin is generally made of polyether polyurethane, which can be quickly identified by those who know chemical industry; the toughness is very high, which can be compared with the common imitation leather outer skin; 3. Versatility: The bending resistance of drag chain cables is much higher than that of ordinary cables.
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