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

A steel-cored aluminum stranded wire and steel stranded wire technology, applied in the direction of connection, conductive connection, electrical component connection, etc., can solve the problems of bitten steel stranded wire, steel core damage, insufficient crimping pressure, etc., to reduce labor High strength, reduced engineering cost, and high crimping quality

Pending Publication Date: 2019-10-22
GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: as Figure 1-15 As shown, a full-tension aluminum-embedded crimping structure of aluminum-steel-reinforced wire includes an aluminum splicing tube 1, a steel splicing tube 2, a steel core splicing aluminum tube 3, an inner embedded aluminum tube 4, and an outer embedded aluminum tube 5. and the qualitative ring 6 of the wire, the steel core connecting aluminum tube 3 is sleeved on the two butted steel strands 7, the steel connecting tube sleeve 2 is connected to the outside of the steel core connecting aluminum tube 3, and the steel connecting tube sleeve 2 is crimped to make the steel The core is connected with the embedded aluminum tube 3 to closely fit the steel strand 3 to form a steel strand crimping joint; the inner layer aluminum tube 4 is placed on the steel strand 7 and the inner aluminum strand layer 8 that are connected to each end of the steel core aluminum strand Between the butt-connected steel-cored aluminum stranded wires at each end is con...

Embodiment 2

[0035] Embodiment 2: A full-tension aluminum-embedded crimping method for aluminum-steel-reinforced wires: the method includes the following steps:

[0036] 1) Cut off the aluminum strands of the steel-reinforced aluminum strands at both ends of the butt joint, and the length of the cut-off section at each end = the length of the steel connecting pipe / 2+20mm;

[0037] 2) Pull the two joints of the steel-reinforced aluminum stranded wire to 10 meters, put one end of the steel-reinforced aluminum stranded wire into the aluminum connecting pipe, and move the aluminum connecting pipe to a position that does not affect the next process;

[0038] 3) Insert one end of the steel-cored aluminum stranded wire into the outer embedded aluminum tube, and the large inner diameter end of the outer embedded aluminum tube points to the joint, and move the outer embedded aluminum tube to a position that does not affect the next process;

[0039] 4) Insert the wire setting ring into the butted s...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R4/20H01R4/18H01R11/01H01R11/09H01R43/048
CPCH01R4/20H01R4/183H01R11/01H01R11/09H01R43/048
Inventor 张仁奇张瑾刘雨菲张义钊
Owner GUIZHOU POWER GRID CO LTD
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