Steel rail defect detection method by electromagnetical ultrasonic technology and device thereof

An electromagnetic ultrasonic and defect detection technology, applied in the direction of measuring devices, using ultrasonic/sonic/infrasonic waves, using sound waves/ultrasonic/infrasonic waves to analyze solids, etc., can solve the problems of reduced environmental adaptability, limited detection speed, and increased detection costs. Achieve the effects of strong environmental adaptability, improved detection speed, and simplified structure

Inactive Publication Date: 2009-04-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the transduction efficiency of piezoelectric ultrasound, these flaw detectors must carry a large amount of acoustic coupling agent, which inevitably leads to many problems: such as increased device complexity and weight, limited detection speed and distance, reduced environmental adaptability, and detection cost Elevate etc.
More importantly, the distance between the piezoelectric ultrasonic sensor and the rail is relatively long, and the sound wave needs to propagate in the couplant for a long time, which causes the reception to lag. When the flaw detection speed increases, the echo will lag behind for a certain distance and cannot Accurately received by ultrasound probes
In order to reduce this distance as much as possible, the diameter o

Method used

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  • Steel rail defect detection method by electromagnetical ultrasonic technology and device thereof
  • Steel rail defect detection method by electromagnetical ultrasonic technology and device thereof
  • Steel rail defect detection method by electromagnetical ultrasonic technology and device thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0033] Embodiment 1, combining figure 1 , the present invention is an electromagnetic ultrasonic technology rail defect detection device, which is composed of a probe (8), a circuit system (9), a storage unit (5) and a display unit (6). The probe (8) is connected to the circuit system (9), and the circuit system (9) is respectively connected to the storage unit (5) and the display unit (6). The circuit system (9) includes a transceiving switch (7), a power amplifier circuit (1), a signal conditioning circuit (2), a data acquisition circuit (3) and a microprocessor (4). Described transceiving changeover switch (7) connects power amplifying circuit (1) and signal conditioning circuit (2) respectively, and power amplifying circuit (1) connects microprocessor (4), and signal conditioning circuit 2 connects data acquisition circuit (3) , the data acquisition circuit (3) is connected to the microprocessor (4), and the microprocessor (4) is respectively connected to the storage unit...

Example Embodiment

[0035] Example 2, combined with figure 2 , image 3 , Figure 4 , Figure 5 , Image 6 , the arrangement of the probe on the rail tread of the present invention adopts a special coil, which can easily generate ultrasonic body waves propagating to the inside of the rail, and properly adjust the frequency of the transmitted pulse, so that the ultrasonic wave can be injected into the rail at a certain angle. exist figure 2 , 3 Among them, A, B, and C are ultrasonic transducers composed of transmitting coils, magnets, and the rail itself. The transducers are placed on the rail tread, and defects at different positions of the rail can be detected more comprehensively by using different emission angles.

[0036] Probe A emits ultrasonic body waves perpendicular to the rail tread, which can detect rail waist and rail bottom defects; probe B is obliquely incident to the length of the rail, and can detect damage to screw holes; two probes C are obliquely incident to the length o...

Example Embodiment

[0039] Example 3, combined with Figure 5 , The excitation principle of the electromagnetic ultrasonic oblique incident body wave of the present invention is: the electromagnetic ultrasonic oblique incident body wave probe is composed of a magnet and an electromagnetic ultrasonic zigzag coil, and the working frequency is 1 MHz. The incident angle of the sound beam of the probe is determined by the wavelength of the sound wave and the turn spacing of the meandering coil. Reasonable adjustment of the transmission frequency and the turn spacing of the meandering coil can make the ultrasonic wave incident in a suitable direction. Let the incident angle of the obliquely incident body wave be θ, then

[0040] sin θ = λ 2 l

[0041] Where λ - the wavelength of the sound wave;

[0042] l—the turn spacing of the meander coil.

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Abstract

The invention belongs to the electromagnetic ultrasonic non-destructive detection field, provides a method for detecting the defects of a steel rail by using the electromagnetic ultrasonic technology, and a device thereof, and aims at solving various problems of the existing steel rail detection method and meeting the need of the development of the high-speed electrified railway. The device consists of a probe, a circuit system, a storage unit and a display unit. The detection device uses an electromagnetic ultrasonic body wave to realize effective detection to the rail head, the rail web and the rail base of the railway by the cooperative work of a plurality of ultrasonic probes. The detection method does not need to use an acoustic couplant, has simple structure and strong adaptive capacity to environment and can realize high-speed steel rail detection.

Description

(1) Technical field [0001] The invention relates to ultrasonic detection technology, in particular to an electromagnetic ultrasonic technology rail defect detection method and a device thereof. (2) Background technology [0002] In terms of rail detection methods, piezoelectric ultrasonic detection is mainly used at home and abroad. In order to ensure the transduction efficiency of piezoelectric ultrasound, these flaw detectors must carry a large amount of acoustic coupling agent, which inevitably leads to many problems: such as increased device complexity and weight, limited detection speed and distance, reduced environmental adaptability, and detection cost Elevate etc. More importantly, the distance between the piezoelectric ultrasonic sensor and the rail is relatively long, and the sound wave needs to propagate in the couplant for a long time, which causes the reception to lag. When the flaw detection speed increases, the echo will lag behind for a certain distance and ...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01B17/06
Inventor 翟国富汪开灿米武军张晓辉康磊宫佳鹏王淑娟
Owner HARBIN INST OF TECH
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