Full-tension aluminum embedding crimping structure for steel core aluminum strand

Abstract

The invention discloses a full-tension aluminum embedding crimping structure for a steel core aluminum strand, which comprises an aluminum splicing sleeve, a steel splicing sleeve, a steel core splicing aluminum embedding pipe, an inner embedded layer aluminum pipe, an outer embedded layer aluminum pipe and a conductor qualitative ring, wherein the steel core splicing aluminum embedding pipe sleeves two connected steel strands; the steel splicing sleeve sleeves the steel core splicing aluminum embedding pipe; the steel splicing sleeve is crimped to enable the steel core splicing aluminum embedding pipe to be closely fit with the steel strand; the inner embedded layer aluminum pipe is placed between the steel strand and the inner aluminum strand layer of each-end connected steel core aluminum strand; each-end connected steel core aluminum strand is sleeved with the outer embedded layer aluminum pipe; the aluminum splicing sleeve sleeves the two outer embedded layer aluminum pipes on twoconnected steel core aluminum strands; and two ends of the aluminum splicing sleeve are crimped to enable the inner embedded layer aluminum pipe to be closely fit with the steel strand and the inneraluminum strand layer and the outer embedded layer aluminum pipe to be closely fit with the steel core aluminum strand and the aluminum splicing sleeve. Crushing, under pressing and strand loosening of the steel core aluminum strand can be avoided, the connection reliability is good, making is easy, the crimping quality is higher, nondestructive detection is avoided, and the labor intensity and the engineering cost are reduced.

Description

technical field [0001] The invention belongs to the technical field of butt joints of steel-cored aluminum stranded wires, and in particular relates to a full-tension aluminum-embedded crimping structure of steel-cored aluminum stranded wires. 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) Damage to the steel core caused by the crimping of the steel core connecting tube. [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 grou...

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 all hydraulically connected by steel pipes directly covering the steel stranded wires. The hardness of the steel 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 gripping force of the joint not meeting the standard requirements.

Among the factors that cause steel strand crimping defects of steel cored aluminum strand and ground wire, the hardness mismatch between steel pipe 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 pipe. When crimping, the inner wall of the steel pipe bites the steel strand wire, resulting in a decrease in the grip of the joint.

[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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