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Detector and method based on electromagnetic ultrasonic oblique incidence body wave

An electromagnetic ultrasonic and detection device technology, which is applied in the direction of using sound waves/ultrasonic waves/infrasonic waves to analyze solids, can solve the problems of easy misjudgment, low detection efficiency, and limited to a certain range under the surface of the wheel tread, and achieve high precision and high speed. The effect of simple detection and structure

Inactive Publication Date: 2010-05-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods can detect cracks on the tire tread surface and near the surface to a certain extent, they have many shortcomings: for example, they can only do static detection (that is, detect the disassembled wheel), and it is necessary to pre-test the tire surface. Processing (such as cleaning or magnetization), mostly manual judgment, etc., not only the detection efficiency is very low, but also easy to misjudgment
Both applications describe the device and method for detecting the wheel tread, but since they both use electromagnetic ultrasonic surface waves to detect the wheel, the detection range is limited to a certain range under the surface of the wheel tread, and it cannot realize the detection of the wheel tire. Comprehensive testing

Method used

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  • Detector and method based on electromagnetic ultrasonic oblique incidence body wave
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  • Detector and method based on electromagnetic ultrasonic oblique incidence body wave

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Embodiment 1

[0027] Embodiment 1, combining figure 1 , figure 2 , the present invention is a detection device based on electromagnetic ultrasonic oblique incident body wave, it is made up of electromagnetic ultrasonic probe array (8) and electromagnetic ultrasonic flaw detector (3), and electromagnetic ultrasonic probe array (8) connects electromagnetic ultrasonic Flaw detector (3).

[0028] The present invention also has the following technical characteristics:

[0029] The electromagnetic ultrasonic flaw detector (3) includes a transmitting circuit (7), a receiving circuit (1), a data acquisition circuit (2), a microprocessor (4), a display unit (6) and a storage unit (5). The circuit (7) is connected to the microprocessor (4), the microprocessor (4) is connected to the data acquisition circuit (2), the display unit (6) and the storage unit (5), and the data acquisition circuit (2) is connected to the receiving circuit (1) .

[0030] The electromagnetic ultrasonic probe array (8) in...

Embodiment 2

[0041] Example 2, combined with figure 2 , image 3 , a detection device and method based on electromagnetic ultrasonic oblique incident body waves of the present invention, each group of the ultrasonic detection probes is composed of an ultrasonic probe A with an integrated function of sending and receiving and an ultrasonic probe B with a receiving function, and has the function of sending and receiving two Function. The working process of the detection device is as follows: the microprocessor (4) sends a control signal to the transmitting circuit (7), and the transmitting circuit (7) drives the ultrasonic probe A to emit an oblique incident body wave. The oblique incident body wave propagates in the wheel rim, The propagation speed is about 3000m / s. When a defect is encountered, part of the energy will be emitted, and the rest of the energy will continue to propagate, and will be reflected when it encounters an end surface. Ultrasonic probe A receives the reflected echo of...

Embodiment 3

[0042] Embodiment 3, combining figure 2 , image 3 , Figure 4 , Figure 5 , a detection device and method based on electromagnetic ultrasonic oblique incident body waves, in the on-line detection device for wheel tire defects, each group of ultrasonic probes is composed of two ultrasonic probes—ultrasonic probe A and ultrasonic probe B, wherein the ultrasonic probe A is used for both transmitting and receiving, and ultrasonic probe B is used for receiving. Before the detection, the ultrasonic probes A and B are first embedded in the rail, and used to detect the non-defective wheels, and the ultrasonic amplitude received by the ultrasonic probe B is recorded at this time. In actual detection, such as Figure 4 As shown, when there is a defect inside the wheel tire, the ultrasonic wave will be reflected when it encounters the defect, and the ultrasonic probe A will receive the reflected echo signal, and at the same time, due to the reflection of part of the ultrasonic ener...

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Abstract

The invention provides a detector and a method based on electromagnetic ultrasonic oblique incidence body wave, which does not need to use an acoustic couplant, to be equipped with a complex mechanical structure or a container for containing the couplant, and has simple detector structure and high precision for quantizing the size of defects. The detector consists of an electromagnetic ultrasonic probe array and an electromagnetic ultrasonic flaw detector, wherein the electromagnetic ultrasonic probe array is connected with the electromagnetic ultrasonic flaw detector by a shield line. In the invention, wheel-tyre defects are detected by electromagnetic ultrasonic oblique incidence body wave, and high-efficiency and high-speed detection to the wheel-tyre defects can be realized. The invention realizes the detection to the wheel-tyre defects by utilizing electromagnetic ultrasonic technology, does not need to be equipped with the complex mechanical structure or the container for containing the couplant, uses an emitting and receiving probe and a receiving probe to carry out detection to the wheel-tyre defects and has high precision for quantizing the size of the deflects by double detection of an end surface reflected wave and a defect reflected wave. By the invention, the on-line detection to the wheel-tyre defects can be realized.

Description

(1) Technical field [0001] The invention relates to electromagnetic ultrasonic detection technology, in particular to a detection device and method based on electromagnetic ultrasonic obliquely incident body waves. (2) Background technology [0002] The wheel is an extremely important part in the operation of the train. It not only bears the weight of the train and its load, but also transmits the driving force and braking force required for the operation of the locomotive through the part of the tire that is in contact with the rail. Therefore, train wheels must be kept in good condition, otherwise it will seriously affect driving safety. However, due to various factors such as unreasonable assembly, emergency braking, and long running time, the tires of the wheels will have defects such as scratches, peeling, and cracks after running for a period of time. At present, the wheel tire defect detection methods are mainly divided into static detection and dynamic detection. S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
Inventor 王淑娟米武军康磊冯剑钊李智超苏日亮翟国富
Owner HARBIN INST OF TECH
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