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Railroad micro-magnetism flaw detector and its defectoscopy

A flaw detector, railway technology, applied in the direction of material magnetic variables, etc., can solve the problems of complex operation (requires 6 people to operate at the same time, the detection is not intelligent, and the resolution of axial defects is low, etc. The effect of stable factor and high detection sensitivity

Inactive Publication Date: 2008-02-13
唐山华通新技术研究开发有限公司
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  • Application Information

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Problems solved by technology

At present, the conventional flaw detection of railways adopts ultrasonic flaw detection method. Its main disadvantages are heavy weight (about 80 kg), inconvenient carrying, complicated operation (requires 6 people to operate at the same time), and continuous application of couplant-water (need to be used in cold winter season). Diesel oil is added to the water to prevent freezing), which is extremely cumbersome; moreover, the detection speed is slow, the resolution of axial defects is low, and small defects cannot be detected; at the same time, the detection is not intelligent, and manual analysis and judgment are required; especially It is the flaw detection of railway turnout parts, which is still a blank at home and abroad. Due to its irregular cross section, ultrasonic and other flaw detection methods such as eddy current detection are powerless. At present, it can only be solved by manual hammering and visual inspection.

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  • Railroad micro-magnetism flaw detector and its defectoscopy

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] FIG. 1 is a schematic block diagram of a railway micromagnetic flaw detector of the present invention, which includes a magnetic sensor device 1 , a signal preprocessor 2 , an A / D converter 3 , and a computer system 4 . The magnetic sensor device 1 scans along the surface of the workpiece to obtain the micro-magnetic signal of defect leakage of the inspected workpiece, and converts it into an electrical signal and sends it to the signal preprocessor 2; the signal preprocessor 2 amplifies, filters, and purifies the signal, and converts the signal The signal is sent to the A / D converter 3; the A / D converter converts the signal into a digital signal and sends it to the computer system 4. The computer system 4 controls the work of the above-mentioned parts, and at the same time performs digital filtering, signal analysis, defect feature extraction, d...

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Abstract

The invention belongs to the safe nondestructive detection technology field, and in particular relates to a railway micro-magnetic flaw detector and an inspection method. A micro-magnetic defect magnetic charge mutation detection principle is adopted by the railway micro-magnetic flaw detector to make the defect detection realized. The railway micro-magnetic flaw detector consists of a magnetic sensor device, a signal preprocessor, an A / D converter and a computer system. The magnetic signals leaked because of defects are detected by the sensing device, converted into electric signals and input into the signal preprocessor. The signals are amplified, filtered and purified by the signal preprocessor, transmitted into the A / D converter and are transformed into digital signals. Then, digital filter, signal analysis, defect estimation, defect calculation and display record are implemented on the signals by the computer and are controlled by the computer to detect defects. The flaw inspection method is used for detecting the railway damage defect. The defect detection reliability is two times higher than a traditional nondestructive method. And the working efficiency is improved by five times. At the same time, a worldwide problem that no effective method can be used for turnout inspection at present is solved.

Description

technical field [0001] The invention belongs to the technical field of safety and nondestructive testing, and in particular relates to a railway micro-magnetic flaw detector and a flaw detection method thereof. Background technique [0002] With the need of speed increase and heavy load, my country's railways put forward higher requirements for the quality and safety status of the railway line itself. At present, the conventional flaw detection of railways adopts ultrasonic flaw detection method. Its main disadvantages are heavy weight (about 80 kg), inconvenient carrying, complicated operation (requires 6 people to operate at the same time), and continuous application of couplant-water (need to be used in cold winter season). Diesel oil is added to the water to prevent freezing), which is extremely cumbersome; moreover, the detection speed is slow, the resolution of axial defects is low, and small defects cannot be detected; at the same time, the detection is not intelligen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/82
Inventor 王祥国徐章遂邵长胜
Owner 唐山华通新技术研究开发有限公司
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