Flexible magnetostriction and magnetoelastic integrated sensor for detecting stress and defect of wire rope

A defect detection and magnetostriction technology, which is applied in the measurement of the change force of the magnetic property of the material caused by the applied stress, the magnetic variable of the material, textiles and papermaking, etc., can solve the problems of inconvenient installation, large quality, complex structure, etc. problem, to achieve the effect of light structure and easy disassembly

Active Publication Date: 2012-05-02
BEIJING UNIV OF TECH
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  • Application Information

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Problems solved by technology

At present, single-function sensors can only detect stress or defects, and due to complex structures, ...

Method used

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  • Flexible magnetostriction and magnetoelastic integrated sensor for detecting stress and defect of wire rope
  • Flexible magnetostriction and magnetoelastic integrated sensor for detecting stress and defect of wire rope
  • Flexible magnetostriction and magnetoelastic integrated sensor for detecting stress and defect of wire rope

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Experimental program
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Embodiment Construction

[0018] The flexible magnetostrictive and magnetoelastic integrated sensor for steel cable stress and defect detection is composed of an inner flexible printed coil 2 and an outer flexible printed coil 3, and the flexible printed coil is divided into a single-layer flexible printed coil ( figure 2 ) and multilayer flexible printed coils ( image 3 ) in two forms. The flexible printed coil is composed of connector 4, copper wire 5 and substrate 6. The length L of the single-layer coil is designed according to the outer diameter D of the steel cable, generally L>π×D, so that the single-layer flexible printed coil can be crimped once, and then fastened and mounted on the surface of the steel cable 1 through the connector 4 .

[0019] The length L of the multi-layer flexible printed coil is designed according to the number n of layers that the coil is finally wound on the surface of the steel cable, generally L>n×π×D. When the multi-layer flexible printed coil is installed on th...

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Abstract

The invention discloses a flexible magnetostriction and magnetoelastic integrated sensor for detecting stress and defect of a wire rope. The integrated sensor comprises an inner flexible printing coil and an outer flexible printing coil, wherein the structure of the flexible printing coil can be curled and attached to the surface of the wire rope to form a single-layer or multi-layer solenoid coil which is locked by a connector and then mounted on the detected wire rope; and after the locked state is released, the solenoid coil is removed from the surface of the wire rope. The integrated sensor can work as a magnetostriction sensor and excite a longitudinal modal ultrasonic guide wave in the wire rope to perform long-distance defect detection of the wire rope or to measure the average stress of the wire rope in a certain distance based on the acoustoelastic effect of the ultrasonic guide wave; and the integrated sensor also can work as a magnetoelastic sensor and calculate the stress value of a section of the wire rope based on the magnetoelastic effect by measuring the magnetic conductivity of the material of the wire rope, or scan along the length direction of the wire rope to obtain the change of the magnetic conductivity of the material of the wire rope along the length direction and reflect the size and position of the defect.

Description

Technical field: [0001] The flexible magnetostrictive and magnetoelastic integrated sensor for steel cable stress and defect detection belongs to the technical field of electromagnetic acoustic sensors. Or based on the ultrasonic guided wave acoustoelastic effect, the average stress of the steel cable within a certain distance can be measured; the magnetic permeability change of the steel cable material along the length direction can also be measured to reflect the size and position of the defect, or based on the magnetoelastic effect, Measure the average stress of a section of the cable. The sensor combines the common structure of magnetostrictive and magnetoelastic sensors, and has the dual functions of defect detection and stress measurement. At the same time, it has flexible and rollable physical properties, light structure, easy disassembly and assembly, and is suitable for actual engineering detection of steel cables. . Background technique: [0002] The health statu...

Claims

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Application Information

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IPC IPC(8): G01L1/12G01N27/83
CPCD07B1/145D07B2301/555
Inventor 吴斌刘秀成何存富
Owner BEIJING UNIV OF TECH
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