A crimping method for 19 stranded steel-cored aluminum stranded wires of round concentric stranded overhead conductors

Abstract

The invention discloses a round wire concentric stranded overhead conductor 19-strand steel core aluminum stranded wire crimping method. The method comprises steps: butted aluminum stranded wires arefirstly stripped for a certain distance to expose a middle steel stranded wire, and the wire is sleeved with an aluminum splicing sleeve; a steel core aluminum stranded wire passes through an outer embedded aluminum pipe, a wire shaping ring sleeves the steel core aluminum stranded wire, an inner embedded aluminum pipe is inserted between an inner aluminum stranded wire layer and a steel core, andafter the opened aluminum stranded wire is recovered, a steel core splicing aluminum sleeve sleeves steel core wire ends of two butted wires; a full-tension steel splicing sleeve sleeves the steel core splicing aluminum sleeve, and through crimping, the steel core splicing aluminum sleeve is engaged with the steel core; and finally, the aluminum splicing sleeve is moved back to the crimping position, and the crimping enables an inner embedded aluminum pipe and an outer embedded aluminum pipe to be closely fit. The steel core aluminum stranded wire can be prevented against crushing, under pressure and strand loosening, the connection reliability is good, making is easy, the crimping quality is higher, non-destructive testing does not happen, and the labor intensity and the engineering costare reduced.

Description

technical field [0001] The invention belongs to the technical field of butt joints of 19 stranded steel-cored aluminum stranded wires of round concentric stranded overhead conductors, and in particular relates to a crimping method for 19 stranded steel-cored aluminum stranded wires of round concentric stranded overhead conductors. Background technique [0002] The existing steel-cored aluminum stranded wire full-tension splicing tube is mainly composed of a steel crimping tube and an aluminum crimping tube. Then use the aluminum alloy crimping tube to crimp the aluminum alloy splicing tube, aluminum stranded wire and steel stranded wire together. This traditional crimping method is prone to two problems: [0003] (1) The damage to the steel core caused by the crimping of the steel core to the aluminum tube. [0004] In the traditional splicing process of overhead conductors in power transmission and transformation projects, the joints of the steel-reinforced aluminum stran...

AI Technical Summary

Problems solved by technology

[0004] In the traditional splicing process of overhead conductors in power transmission and transformation projects, the joints of the steel-reinforced aluminum stranded wire and the galvanized steel stranded wire (or aluminum-clad steel stranded wire) of the ground wire are directly covered with steel strands by steel splicing tubes and hydraulically connected. , if the hardness of the steel splicing pipe and the steel strand does not match, the size of the crimping die is unreasonable, and the crimping pressure is insufficient, defects such as undervoltage, loose strands, overpressure, and steel wire surface damage are prone to occur, resulting in the holding force of the joint not meeting the standard Require

Among the factors that cause steel strand crimping defects of steel cored aluminum strand and ground wire, the hardness mismatch between steel splicing pipe and steel strand is the most unavoidable. In the production process of aluminum clad steel strand, cold drawn steel wire The hardness of the cold-drawn steel wire is reduced, resulting in a lower hardness of the steel strand than that of the steel splicing tube. When crimping, the inner wall of the steel splicing tube bites the steel strand wire, resulting in the grip of the joint. Focus on lowering

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

[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

[0010] In order to solve the problems of damage to the steel core and unstable crimping quality of aluminum splicing tubes that are prone to occur in traditional crimping methods, it is necessary to design a new type of full-tension aluminum-embedded crimping process for steel-reinforced aluminum stranded wire. Twisted wire butt joint crimping is easier to implement, the crimping quality is higher, and the crimping joint can avoid non-destructive testing, reducing labor intensity and engineering costs

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