A method of crimping 7 stranded steel core aluminum stranded wires embedded with aluminum tension clamps

Abstract

The invention discloses a 7 stranded steel core stranded aluminum conductor aluminum-embedded tensile wire clamp crimping method. The method comprises steps: the stranded aluminum conductor is stripped to expose the steel core; an aluminum sleeve clamp performs sleeving from the steel core stranded aluminum conductor end; the steel core stranded aluminum conductor passes through an outer-embeddedaluminum tube; a conductor shaping ring sleeves the steel core stranded aluminum conductor, and the conductor shaping ring is fixed on the stranded aluminum conductor layer of the steel core strandedaluminum conductor; the stranded aluminum conductor layer of the steel core stranded aluminum conductor is loosened, and an inner-embedded aluminum tube sleeves the steel core; a repaired stranded aluminum conductor is sleeved in the outer-embedded aluminum tube; a steel core aluminum-embedded tube is embedded in a steel anchor crimping tube; a steel core stranded steel conductor is inserted fromone end of the steel core aluminum-embedded tube; the steel anchor crimping tube is crimped; an aluminum sleeve clamp movably sleeves the steel core stranded aluminum conductor outer-embedded aluminumtube and the steel anchor crimping tube; and the aluminum sleeve clamp and the steel anchor crimping tube are crimped. Crushing, undercompaction and strand loosening of the 7 stranded steel core stranded aluminum conductor can be prevented, the connection reliability is good, making is easy, the crimping quality is higher, non-destructive testing is not needed, and the labor intensity and the engineering cost are reduced.

Description

technical field [0001] The invention belongs to the technical field of steel-cored aluminum stranded wire embedded aluminum tension clamps, and in particular relates to a method for crimping seven steel-cored aluminum stranded wires embedded with aluminum tension 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 for overhead wires in po...

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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