Railroad micro-magnetism flaw detector and its defectoscopy

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...

AI Technical Summary

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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