A crimping method for 19 stranded steel-cored aluminum stranded wires embedded with aluminum tension clamps

Abstract

The invention discloses a crimping method for 19 twisted steel-cored aluminum strands embedded with aluminum strain-resistant clamps. The method comprises the steps of: stripping the aluminum strands to expose the steel core; Putting in; inserting the steel-reinforced aluminum stranded wire into the outer embedded aluminum tube; inserting the wire setting ring into the steel-reinforced aluminum stranded wire, and fixing the wire-setting ring on the steel-reinforced aluminum stranded wire layer; loosening the steel Core aluminum stranded wire aluminum stranded wire layer, put the inner embedded aluminum tube into the steel core; put the repaired aluminum stranded wire into the outer embedded aluminum tube; embed the steel core embedded aluminum tube into the steel anchor crimping tube; The steel core steel strand is inserted from one end of the steel core embedded aluminum tube; crimping the steel anchor crimping tube; moving the aluminum sleeve clamp to the steel core aluminum stranded wire embedded aluminum tube and steel anchor crimping tube; crimping crimping aluminum Sleeve clamps and steel anchor crimps. The invention avoids crushing, undervoltage and loose strands of 19 twisted steel-cored aluminum strands, has good connection reliability, is easy to manufacture, has higher crimping quality, avoids non-destructive testing, and reduces labor intensity and engineering cost.

Description

technical field [0001] The invention belongs to the technical field of aluminum-steel-cored aluminum stranded wire-embedded aluminum strain clamps, and in particular relates to a crimping method for 19 twisted steel-cored aluminum stranded wires embedded with aluminum-resistant strain clamps. Background technique [0002] The existing steel-cored aluminum stranded wire strain clamp is mainly composed of a steel anchor crimping tube and an aluminum crimping tube. When crimping, first peel off a section of the aluminum stranded wire to expose the steel strand, and use the steel anchor crimping tube to crimp the steel strand. , and then use the aluminum alloy crimping tube to crimp the aluminum alloy connecting tube, aluminum strand, and steel strand together. This traditional crimping method is prone to two problems: [0003] (1) Damage to the steel core caused by the crimping of the steel anchor crimping tube [0004] In the traditional crimping process of tension clamps fo...

AI Technical Summary

Problems solved by technology

[0004] In the traditional crimping process of tension clamps for overhead wires in power transmission and transformation projects, the joints of galvanized steel strands (or aluminum-clad steel strands) of steel-cored aluminum strands are directly covered with steel anchor crimping tubes. Line hydraulic connection, if the hardness of the steel anchor crimping tube and the steel strand does not match, the size of the crimping die is unreasonable, and the crimping pressure is insufficient, defects such as underpressure, loose strands, overpressure, and steel wire surface damage are prone to occur, resulting in joint grip Efforts not to meet standard requirements

Among the factors that cause steel strand crimping defects of steel cored aluminum stranded wire, the hardness mismatch between steel anchor crimping tube and steel strand is the most unavoidable. In the production process of aluminum clad steel strand, cold drawn steel wire passes through Liquid aluminum plating is equivalent to tempering once, and the hardness of the cold-drawn steel wire is reduced, resulting in a lower hardness of the steel strand than the steel anchor crimping tube. Focus on lowering

[0005] (2) It is difficult to guarantee the crimping quality of the aluminum sleeve clamp

[0008] In winter, when the temperature drops, because the steel core is in the elastic range, the cross section of the steel core becomes thinner, the pressure applied by the steel core to the aluminum strand decreases, and the cross section of the aluminum strand also shrinks, but because the aluminum strand has already undergone yield hardening, The cross-section of the aluminum strands did not expand due to the reduction in pressure, which resulted in gaps between the aluminum strands

[0009] Rainwater, air, dirt, and corrosive media infiltrate the gap between the aluminum strands of the joint, oxidize the surface of the aluminum strands, and generate aluminum oxide, which leads to increased contact resistance and heat generation at the crimping joints of the steel-reinforced aluminum strands. , eventually failing

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