Butt-joint aluminum-embedded crimping structure and method for overhead conductor seven-stranded steel wire

Abstract

The invention discloses a butt-joint aluminum-embedded crimping structure and method for an overhead conductor seven-stranded steel wire, and the structure comprises a steel pipe and an aluminum-alloypipe, wherein the aluminum-alloy pipe is embedded into the steel pipe, and wraps two round concentric overhead conductor seven-stranded steel wires in butt joint. The crimping of the steel pipe enables the aluminum-alloy pipe to be closely attached to the round concentric overhead conductor seven-stranded steel wires to form a steel core splicing sleeve. According to the invention, the aluminum-alloy pipe is added between the steel pipe and the round concentric overhead conductor seven-stranded steel wires, and the high plasticity and a large friction coefficient of the aluminum-alloy pipe are employed for avoiding the pressing damages, under-pressing and strand loosening of the round concentric overhead conductor seven-stranded steel wires during the crimping of the steel pipe and the round concentric overhead conductor seven-stranded steel wires. Meanwhile, the structure meets the requirements of a holding force of a connector, enables the butt joint crimping of the round concentricoverhead conductor seven-stranded steel wires to be easier, and is higher in crimping quality. A crimping head can be free of lossless detection, thereby reducing the labor intensity and the engineering cost.

Description

technical field [0001] The invention belongs to the technical field of crimping of seven stranded steel strands of round concentric stranded overhead conductors, and in particular relates to a butt joint structure and method of aluminum-embedded crimping of seven stranded steel strands of overhead conductors. Background technique [0002] In the traditional connection process of overhead conductors and ground wires in power transmission and transformation projects, 7 stranded steel strands (or aluminum-clad round wire concentric strand overhead conductors 7 Stranded steel strands) joints are directly covered with steel pipes and the 7 stranded steel strands of the round concentric stranded overhead conductors are hydraulically connected. Unreasonable size and insufficient crimping pressure are prone to defects such as undervoltage, loose strands, overpressure, and steel wire surface damage, resulting in the gripping force of the joint not meeting the standard requirements. ...

AI Technical Summary

Problems solved by technology

[0002] In the traditional connection process of overhead wires and ground wires in power transmission and transformation projects, 7 stranded steel strands (or aluminum-clad round wire concentric stranded overhead wires 7 Stranded steel strands) joints are directly covered with steel pipes and the 7 stranded steel strands of concentric stranded overhead wires of round wires are hydraulically connected. Unreasonable size and insufficient crimping pressure are prone to defects such as undervoltage, loose strands, overpressure, and steel wire surface damage, resulting in the gripping force of the joint not meeting the standard requirements

Among the factors that cause the crimping defects of the round wire concentric strand overhead conductors and the ground wires, the hardness mismatch between the steel pipe and the round wire concentric strand overhead conductors is the most unavoidable. Yes, in the production process of 7 stranded steel strands for concentric stranded overhead conductors of aluminum-clad round wires, the cold-drawn steel wires pass through the liquid aluminum plating, which is equivalent to tempering once, and the hardness of the cold-drawn steel wires decreases, resulting in the concentric stranded overhead wires of the round wires. The hardness of the 7 stranded steel strands of the conductor is lower than that of the steel pipe. When crimping, the inner wall of the steel pipe bites the round wire and the 7 stranded steel stranded steel wires of the overhead conductor, resulting in a decrease in the gripping force of the joint.

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