CN103399037B - Active infra-red tubing defect inspection method based on electromagnetic induction heating - Google Patents
Active infra-red tubing defect inspection method based on electromagnetic induction heating Download PDFInfo
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- CN103399037B CN103399037B CN201310342113.5A CN201310342113A CN103399037B CN 103399037 B CN103399037 B CN 103399037B CN 201310342113 A CN201310342113 A CN 201310342113A CN 103399037 B CN103399037 B CN 103399037B
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Abstract
A kind of tubing infrared detection method based on electromagnetic induction heating excitation, it is characterized in that at one end of ferromagnetism bar stranded enamel-covered wire of uniform winding as coil, the other end is through tubing to be detected, then utilize ferromagnetism clamp clamps bar two ends to form closed yoke, and logical high frequency electric carries out electromagnetic induction heating on coil two joints, heating is placed in tubing both sides to observe its surface temperature distribution characteristic over time by two thermal infrared imagers with 180 degree angles simultaneously, thereby surveys the defect in tubing. Advantage of the present invention is: heater cost is low, simple in structure, and surface and the internal flaw such as homogeneous heating, efficiency are high, can corrosion cracking well from tube surfaces temperature distributing characteristic, be detected, be mingled with, pore.
Description
Technical field
The present invention relates to a kind of tubing Infrared Non-destructive Testing method, relate in particular to a kind of active infra-red detection method based on electromagnetic induction heating.
Background technology
At present, utilizing active infra-red Dynamic Non-Destruction Measurement to carry out in the detection of tubing defect, many employing flash lamps, high-frequency mechanical vibration, steam etc. are treated detected object and are carried out thermal excitation, detect internal flaw by thing surface temperature distribution characteristic temporal evolution situation to be checked. But utilize flash lamp and steam easily to produce heating uneven phenomenon to tubing heating, and affecting testing result, high-frequency mechanical vibration is only applicable to again the detection of crack defect. The deficiency existing while being used for tubing infrared detection for existing energisation mode, this patent has proposed AC power to access on the coil on ferromagnetism bar after by frequency converter again, the magnetic flux changing at a high speed can make to produce in tubing the eddy current that has the effect of heating, thereby tubing is realized to efficiently and equably heating, and then utilize thermal imaging system to observe tubing surface temperature distribution characteristic to reach the detection effect of tube surfaces and internal flaw more accurately.
Summary of the invention
The object of the present invention is to provide a kind of tubing defect infrared detection system, adopt a kind of exciting bank based on electromagnetic induction heating, to solve existing thermal excitation mode existing problem when heating tubing, and then observe tubing surface temperature distribution characteristic to detect more accurately the defect in tubing by thermal imaging system.
The present invention is achieved like this, and it is characterized in that at the stranded enamel-covered wire of one end of ferromagnetism bar uniform winding, and the other end, through tubing to be detected, then utilizes ferromagnetism clamp clamps bar two ends to form closed yoke. Utilize frequency converter by the magnetic flux changing to produce high speed on switch-on coil after AC power high frequency, thereby the magnetic flux changing at a high speed can produce eddy current in tubing causes body heating, the position heat production rate difference that magnetic conductivity is different is placed in tubing both sides to observe its surface temperature distribution characteristic over time by two thermal infrared imagers with 180 degree angles logical electrically heated simultaneously.
Advantage of the present invention is: heater cost is low, simple in structure, and surface and the internal flaw such as homogeneous heating, efficiency are high, can corrosion cracking well from tube surfaces temperature distributing characteristic, be detected, be mingled with, pore. Can use same ferromagnetism bar to the tubing to be measured of different inner diameters, without replacing; And structural concentric fixed form can make to be concentric distribution characteristics by the magnetic field of volution of tubing section. Can realize Long-distance Control and remote thermal analysis.
Brief description of the drawings
Fig. 1 is structural representation of the present invention, and Fig. 2 is that tubing is observed sectional view
In the drawings, 1. AC power, 2. frequency converter, 3. control circuit, 4. holding circuit; 5. stranded enamel-covered wire, 6. ferromagnetism bar, 7. ferromagnetism fixture, 8. metal tube; 9. the nonmagnetic insulation material of high temperature resistant plastic cement, 10. thermal infrared imager, 11. Internet Transmission casees, 12. computers
Detailed description of the invention
As shown in Figure 1, the present invention is achieved in that AC power 1 is accessed to frequency converter 2, and it is uprised frequently by low frequency; Control circuit 3 and frequency converter 2 are connected to play to the effect of on-off circuit, automatic inspection, holding circuit 4 is connected with frequency converter 2 and plays maximum current limit, mistake or under-voltage protection effect. Using stranded enamel-covered wire 5 uniform winding in one end of ferromagnetism bar 6 as coil, the other end of ferromagnetism bar 6 makes on its central axis that is fixed on metal tube 8 through metal tube 8 and by the nonmagnetic insulation material 9 of high temperature resistant plastic cement, utilizes ferromagnetism fixture 7 to clamp two ends that ferromagnetism bar 6 exposes to form closed yoke. Two interfaces of stranded enamel-covered wire 5 are connected with frequency converter 2 high-frequency electrical out, in closed magnetic yoke magnetic bar 6 parts, variation magnetic field can make to produce and have the eddy current of forcing heat effect in metal tube 8 fast so, the eddy current that in tubing, the different material of magnetic conductivity causes is also different, and therefore relevant position temperature is also just different. Its surface temperature distribution characteristic is observed over time in the both sides that energising is carried out, in electromagnetic induction heating process, two thermal infrared imagers 10 are placed in to metal tube 8 with 180 degree angles, computer 12 is connected with thermal infrared imager 10 to it is carried out to Long-distance Control by Internet Transmission case 11 simultaneously, also can utilizes in addition the special-purpose software on computer 12 to carry out heat analysis in real time to the thermography gathering. Produce electromagnetic induction because fast-changing magnetic field can not make corrosion cracking space and pore or white point, appropriate section also just there will not be electromagnetic induction heat production phenomenon, and what the temperature on so corresponding surface can be than the intact region of periphery is low; For inclusion defect, if inclusion material is higher than the magnetic conductivity of tubing, the temperature of respective surfaces is higher than periphery so, otherwise low. By above characteristic, can detect the different defect of tubing.
Claims (1)
1. the tubing infrared detection method based on electromagnetic induction heating energisation mode, the method based on system comprise frequency converter, control circuit, holding circuit, coil, ferromagnetism bar, ferromagnetism fixture, thermal infrared imager, Internet Transmission case, computer, it is characterized in that forming coil at the stranded enamel-covered wire of one end of ferromagnetism bar uniform winding, the other end is through tubing to be detected, and make on its central axis that is fixed on tubing by the nonmagnetic insulation material of high temperature resistant plastic cement, then utilize ferromagnetism clamp clamps bar two ends to form closed yoke, on coil, logical high frequency electric is to produce the magnetic flux changing at a high speed, the magnetic flux changing at a high speed makes to produce in tubing the eddy current that has the effect of heating, the position heat production rate difference that magnetic conductivity is different, when heating, two thermal infrared imagers are placed in to tubing both sides with 180 degree angles to observe its surface temperature distribution characteristic over time to survey the defect of tubing, can use same ferromagnetism bar to the tubing to be measured of different inner diameters, without replacing, and structural concentric fixed form can make to be concentric distribution characteristics by the magnetic field of volution of tubing section, described computer is connected with thermal infrared imager to it is carried out to Long-distance Control by Internet Transmission case, can utilize the special-purpose software on computer to carry out the analysis of real time remote heat to the thermography gathering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310342113.5A CN103399037B (en) | 2013-08-08 | 2013-08-08 | Active infra-red tubing defect inspection method based on electromagnetic induction heating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310342113.5A CN103399037B (en) | 2013-08-08 | 2013-08-08 | Active infra-red tubing defect inspection method based on electromagnetic induction heating |
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| Publication Number | Publication Date |
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| CN103399037A CN103399037A (en) | 2013-11-20 |
| CN103399037B true CN103399037B (en) | 2016-05-18 |
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| CN201310342113.5A Expired - Fee Related CN103399037B (en) | 2013-08-08 | 2013-08-08 | Active infra-red tubing defect inspection method based on electromagnetic induction heating |
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Cited By (1)
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| CN109115833A (en) * | 2016-10-26 | 2019-01-01 | 王琪 | A kind of cable aging axial position detection method |
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| CN103399037A (en) | 2013-11-20 |
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