Method and device thereof for testing deformation of steel wire in wire rope strand

Abstract

The invention relates to a method and a device thereof for testing a deformation of a steel wire in a wire rope strand. An optical lever consisting of a plane mirror with three supporting points, a vertical measuring scale and a telescope is arranged on one side of a wire rope to be tested; two front supporting points of the plane mirror are fixed on a fixing chuck while the rear supporting point is fixedly connected to a point to be tested on the wire rope; the plane mirror can rotate by using a connecting line between the two front supporting points as an axis; the measuring scale is provided with the telescope corresponding to the plane mirror, by which a numeric value reflected on a mirror surface can be conveniently seen; the numeric value is read again after the plane mirror is rotated at a certain angle; the two numeric values are subtracted to obtain a difference value which is a value of magnification after the wire rope is stretched; and the stretched length of the deformed wire rope can be deducted by using a trigonometric function formula. The method and the device thereof for testing the deformation of the steel wire in the wire rope strand realize measurement of magnifying to read the stretched length of the small wire rope with a simple structure by using the optical lever and the principle of mirror reflection and are convenient for experiments.

Description

technical field [0001] The invention relates to a method for measuring the stress and deformation of steel wires in steel wire strands, in particular to a method and a device for measuring the deformation of steel wires in steel wire strands. Background technique [0002] The steel wire rope is a twisted structure in which steel wires are twisted into strands, and then the strands are twisted into wire ropes, in which strands and strands are twisted together at a certain angle. When the steel wire rope is subjected to axial load or bending, the force and deformation of the steel wire are very different due to the different lengths of the steel wire and the different spatial spiral shapes between the wires. Fatigue tests are carried out on single wire or the whole rope to verify the relationship between the life of the steel wire rope and the load change of the steel wire, but there is no test for the deformation of the steel wire in the strand under the stress of the whole r...

AI Technical Summary

Problems solved by technology

When the steel wire rope is subjected to axial load or bending, the force and deformation of the steel wire are very different due to the different lengths of the steel wire and the different spatial spiral shapes between the wires. Fatigue tests are carried out on single wire or whole rope to verify the relationship between the life of the wire rope and the load change of the wire, but there is no test for the deformation of the steel wire in the strand under the condition of the whole rope.

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