Active infrared tube defect detection method based on electromagnetic induction heating

A technology of electromagnetic induction heating and infrared detection, which is applied in the direction of induction heating, material defect testing, induction heating devices, etc., to achieve the effects of low cost, uniform heating and simple structure

Inactive Publication Date: 2013-11-20
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0003] The purpose of the present invention is to provide an excitation device based on electromagnetic induction heating required for infrared detection of pipes, so as to solve the problems existing when the existing thermal excitation method is used to heat pipes, and then observe the temperature distribution characteristics of the pipe surface with the help of a thermal imager For more accurate detection of defects in tubing

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  • Active infrared tube defect detection method based on electromagnetic induction heating
  • Active infrared tube defect detection method based on electromagnetic induction heating

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Embodiment Construction

[0008] Such as figure 1 As shown, the present invention is realized in this way, the AC power supply 1 is connected to the frequency converter 2 to make it change from low frequency to high frequency; the control circuit 3 is connected to the frequency converter 2 to play the role of switching circuit and automatic inspection, and protect the circuit 4 is connected with the frequency converter 2 to play the role of maximum current limit, over or under voltage protection. The stranded enameled wire 5 is evenly wound on one end of the ferromagnetic rod 6 as a coil, and the other end of the ferromagnetic rod 6 passes through the metal tube 8 and is fixed on the central axis of the metal tube 8 with a high-temperature-resistant plastic non-magnetic insulating material 9 Above, use the ferromagnetic clamp 7 to clamp the exposed ends of the ferromagnetic rod 6 to form a closed magnetic yoke. The two interfaces of the twisted enameled wire 5 are connected with the high-frequency ele...

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Abstract

The invention relates to an active infrared tube defect detection method based on electromagnetic induction heating. The method is characterized in that stranded wire is uniformly wound on one end of a ferromagnetic bar so as to form a coil; the other end of the ferromagnetic bar penetrates a tube to be detected; two ends of the rod are clamped by using ferromagnetic fixtures, such that a closed magnetic yoke is formed; high-frequency current is conducted on two joints of the coil for carrying out electromagnetic induction heating; during heating, two thermal infrared imagers are arranged on two sides of the tube with an included angle of 180 DEG, such that changes of surface temperature distribution characteristics with time can be observed, and tube defect can be detected. The method has the advantages of low heating device cost, simple structure, uniform heating, and high efficiency. With the method, surface and internal defects such as corrosion cracks, impurities, pores, and the like can be well detected from tube surface temperature distribution characteristics.

Description

technical field [0001] The invention relates to an infrared non-destructive detection method for pipe materials, in particular to an active infrared detection method based on electromagnetic induction heating. Background technique [0002] At present, in the detection of pipe defects using active infrared non-destructive testing technology, flashlights, high-frequency mechanical vibration, steam, etc. are used to thermally excite the object to be inspected, and internal defects are detected through the temperature distribution characteristics of the surface of the object to be inspected over time. . However, the use of flash lamps and steam to heat the pipe is prone to uneven heating, which affects the detection results, and high-frequency mechanical vibration is only suitable for the detection of crack defects. Aiming at the deficiencies of the existing excitation methods used in the infrared detection method of pipes, this patent proposes to connect the AC power to the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/72H05B6/10
Inventor 万雄邓昌海张志敏
Owner NANCHANG HANGKONG UNIVERSITY
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