Low-frequency magnetic flux leakage sensor magnetic-sensitive element clamping combined multi-axis mobile device

A technology of magnetic flux leakage sensor and magnetic sensitive element, which is applied in the direction of material magnetic variable, etc., can solve the problems that the number, direction and position of magnetic sensitive elements cannot be adjusted, and the detection effect of low frequency magnetic flux leakage sensor cannot be guaranteed.

Active Publication Date: 2015-11-25
BEIJING UNIV OF TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

In conventional magnetic flux leakage detection sensors, most of the magnetic sensitive elements are fixed on the bracket of the sensor by pasting, and the number, direction and position of the magnetic sensitive elements cannot be adjusted, so that the low-frequency magnetic flux leakage sensor cannot be guaranteed to obtain the best performance. Detection effect

Method used

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  • Low-frequency magnetic flux leakage sensor magnetic-sensitive element clamping combined multi-axis mobile device
  • Low-frequency magnetic flux leakage sensor magnetic-sensitive element clamping combined multi-axis mobile device
  • Low-frequency magnetic flux leakage sensor magnetic-sensitive element clamping combined multi-axis mobile device

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Embodiment Construction

[0022] Below in conjunction with content of the present invention provide following embodiment:

[0023] Installation example of multi-axis moving device for clamping magnetic sensitive elements of large-size low-frequency magnetic flux leakage sensor:

[0024] 1) First, for a U-shaped low-frequency magnetic flux leakage sensor with a size of 70mm×40mm×56mm and a distance between two poles of 30mm, select a multi-axis moving device for clamping the magnetic sensitive element of a large-scale low-frequency magnetic flux leakage sensor (as attached figure 1 shown).

[0025] 2) Insert a single commonly used magnetic sensitive element—Hall element (T094 package) into the fixed slider 1 through a highly elastic polymer material (such as rubber) that matches the size of the slot in the fixed slider. Slide and rotate the fixed slider 1 in the tray 2 to find the detection angle and detection position that meet the experimental design, and the Hall element angle and the x-direction de...

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Abstract

A low-frequency magnetic flux leakage sensor magnetic-sensitive element clamping combined multi-axis mobile device is provided. Because U-shaped low-frequency magnetic flux leakage sensors can change the sensor self size based on size difference of measured defects, the structure contains two clamping devices with different specifications, and general detection of the sensors with different sizes can be met through corresponding assembly and adjustment methods. With use of the clamping device, single-channel or multi-channel stability detection information can be obtained, the demand of different detection angles and detection positions can be met, and the stability, reliability and adjustability of detection signals of the low-frequency magnetic flux leakage sensors in magnetic flux leakage detection are achieved.

Description

technical field [0001] The invention relates to a novel magnetic-sensitive element clamping device for low-frequency magnetic flux leakage detection, which is used for fixing and multi-axis movement of tiny magnetic-sensitive elements in a U-shaped low-frequency magnetic flux leakage sensor, so as to facilitate accurate detection of cracks and belongs to the field of non-destructive testing. Background technique [0002] Pipeline is one of the key equipment in today's transportation industry, and it is very easy to produce different degrees of crack damage during its operation and service. Magnetic flux leakage technology is a technology commonly used in pipeline crack defect detection, and low-frequency magnetic flux leakage detection technology using AC magnetization is a new type of magnetic flux leakage detection technology. This technology has the advantages of small residual magnetism, small volume of testing equipment, light weight and low power consumption, etc., and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/83
Inventor 焦敬品石福涛常予杨丽吴斌何存富
Owner BEIJING UNIV OF TECH
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