19-twisted steel strand aluminum embedding strain clamp crimping method

Abstract

The invention discloses a 19-twisted steel strand aluminum embedding strain clamp crimping method. The method comprises steps that 1), an aluminum embedding pipe is embedded into a steel anchor crimping pipe; 2), steel strands are inserted from one end of the aluminum embedding pipe, and steel strands are inserted into the bottom of a clamp anchor ring; 3), a crimping die is utilized to crimp thesteel anchor crimping pipe, the aluminum embedding pipe is tightly engaged with a surface of the steel strands, gaps between a steel anchor and the steel strands are further filled to form a steel strand strain joint. The method is advantaged in that the aluminum embedding pipe is added between the steel anchor crimping pipe and the circular concentric stranded overhead 19-stranded steel strands,high plasticity and a high static friction coefficient of the aluminum embedding pipe are utilized, the 19-stranded steel strands and the strain clamp are prevented from being crushed, under-pressuredand strand-loosen during crimping of the steel anchor crimping pipe and the 19-stranded steel strands, moreover, gripping requirements of the joint are further met, 19-stranded steel strand docking and crimping are easy to implement, the crimping quality is higher, the crimping joint can be free of non-destructive testing, and labor intensity and engineering cost are reduced.

Description

technical field [0001] The invention belongs to the technical field of crimping of 19 twisted steel strands embedded with aluminum tension clamps, and in particular relates to a crimping method of 19 twisted steel strands embedded with aluminum tension clamps. Background technique [0002] In the traditional splicing process of tension clamps for overhead conductors in power transmission and transformation projects, the joints of galvanized steel strands (or aluminum-clad steel strands) of steel strands are all hydraulically connected by steel anchors directly covering the strands. The hardness of the steel anchor 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 the steel strand cr...

AI Technical Summary

Problems solved by technology

[0002] In the traditional splicing process of tension clamps for overhead conductors in power transmission and transformation projects, the joints of galvanized steel strands (or aluminum-clad steel strands) of steel strands are all hydraulically connected by steel anchors directly covering the strands. The hardness of the steel anchor 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 the steel strand crimping defects of the steel strand, the hardness mismatch between the steel anchor and the steel strand is the most unavoidable. In the production process of the aluminum clad steel strand, the cold drawn steel wire passes through the liquid aluminum plating , quite a tempering, the hardness of the cold-drawn steel wire is reduced, resulting in a lower hardness of the steel strand than the steel anchor, and the inner wall of the steel anchor bites the steel strand wire during crimping, resulting in a decrease in the gripping force of the joint

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