CPC H01B 7/1865 (2013.01) [H01B 7/04 (2013.01); H01B 13/14 (2013.01); H01B 13/34 (2013.01); Y10T 29/49117 (2015.01)] | 1 Claim |
1. A manufacturing method of a hoisting cable with small diameter, high strength, and high flexibility, comprising:
normally twisting 37 silver-plated copper wires in a layered form to obtain an inner conductive core, wherein, 1 silver-plated copper wire is arranged as a central wire in a first structural layer; 6 silver-plated copper wires are arranged in a second structural layer, and normal twisting is conducted in a left direction; 12 silver-plated copper wires are arranged in a third structural layer, and normal twisting is conducted in a right direction; and 18 silver-plated copper wires are arranged in a fourth structural layer, and normal twisting is conducted in the left direction;
preheating the obtained inner conductive core, extruding FEP with a high-temperature extruder, coating extruded FEP on a preheated inner conductive core, and cooling with hot water at 80° C. to 90° C. to obtain an insulating layer;
weaving silver-plated copper wires outside the obtained insulating layer in the following manner: 16 spindles×4 wires/spindle×diameter of 0.18 mm to obtain an outer conductive wire layer (3), wherein, the silver-plated copper wires are woven at a weaving pitch of 21 mm to 25 mm;
weaving a Vectran aramid fiber mesh outside the obtained outer conductive wire layer to obtain a tensile layer (4), wherein, aramid fibers are woven at a constant tension, a weaving pitch of 80 mm to 90 mm, and a weaving angle of 10° in the following manner: 24 spindles×2 strands/spindle; and
wrapping the obtained tensile layer with a polyimide film coated with tetrafluoroethylene-hexafluoropropylene copolymer, and after the wrapping is completed, fusing the polyimide film at 400° C. and cooling to obtain an outer protective layer.
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