CN103940852B - Magnetically closed electromagnetic thermal excitation detection device and detection method for conductor defects capable of conducting magnetism - Google Patents
Magnetically closed electromagnetic thermal excitation detection device and detection method for conductor defects capable of conducting magnetism Download PDFInfo
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- CN103940852B CN103940852B CN201410154429.6A CN201410154429A CN103940852B CN 103940852 B CN103940852 B CN 103940852B CN 201410154429 A CN201410154429 A CN 201410154429A CN 103940852 B CN103940852 B CN 103940852B
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- 230000005284 excitation Effects 0.000 title claims abstract description 60
- 239000004020 conductor Substances 0.000 title claims abstract description 59
- 230000007547 defect Effects 0.000 title claims abstract description 49
- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 230000005389 magnetism Effects 0.000 title abstract 3
- 238000010438 heat treatment Methods 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 5
- 239000000284 extract Substances 0.000 claims description 5
- 235000019628 coolness Nutrition 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 230000005674 electromagnetic induction Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a magnetically closed electromagnetic thermal excitation detection device and a detection method for conductor defects capable of conducting magnetism. The magnetically closed electromagnetic thermal excitation detection device and the detection method for the conductor defects capable of conducting magnetism are based on the principles of electromagnetic induction and eddy current effect, an electromagnetic heating method is adopted, different frequencies, waveforms and powers can be selected for thermal excitation, local excitation can be performed on events, the defects of the surface and the deeper layer of the conductor can be found out through detection of the dynamic temperature rise and fall process of the heated part, the operation is convenient, the adjustment is flexible and convenient, and the detection precision is high.
Description
Technical field
The present invention relates to technical field of nondestructive testing, the defect in conductor magnetic particularly relating to a kind of energy magnetic conduction closes 9 Cr 2 steel using electromagnetic heating excitation detecting device and detection method.
Background technology
Active thermal excitation (heating) can make detected material produce different thermo parameters method due to internal flaw on surface, again through thermal infrared imager imaging, such that it is able to see internal flaw more intuitively clearly.Simultaneously through the defect recognition in later stage, defect can be carried out quantitative study.Conventional thermal excitation mode has the heating of plasma jet, direct flame, high energy pulse, infrared lamp and heat ultrasonic, most common of which is high energy pulse flash lamp heating means, it is the high light radiation utilizing xenon flash lamp or other high energy gas discharge lamps to send when carrying out high-energy discharge, instantaneous releasing heat energy, carries out instantaneous excitation to testee.But such detection method is complex, requiring higher for processing technique, it is very inconvenient to operate, and the precision of detection is also poor.
Summary of the invention
The technical problem to be solved in the present invention is: in order to provide the defect in conductor magnetic of a kind of energy magnetic conduction to close 9 Cr 2 steel using electromagnetic heating excitation detecting device and detection method, different frequency, waveform, power can be selected to carry out thermal excitation, event is carried out local excitation, finds out conductive surface to be measured and deep zone defect.
The technical solution adopted for the present invention to solve the technical problems is: the defect in conductor magnetic of a kind of energy magnetic conduction closes 9 Cr 2 steel using electromagnetic heating excitation detecting device, including power buggy, U-shaped magnetic conductor, excitation coil and holddown spring, described U-shaped magnetic conductor is fixed on power buggy bottom end, described U-shaped magnetic conductor includes integrated thermal excitation heating part and fixed part, described fixed part is arranged on two ends, thermal excitation heating part, described excitation coil is set on thermal excitation heating part, and described fixed part is connected with power buggy elasticity by holddown spring.
Being evenly arranged with three running wheels in described power buggy, running wheel is embedded in the groove of power buggy, and running wheel is connected with drive motor, and drive motor controls power buggy by running wheel and moves or turn to.
As preferably, described U-shaped magnetic conductor is ferrite, the thermal excitation heating part of U-shaped magnetic conductor is a rectangle cylinder, its width is corresponding with the diameter of excitation coil, the two ends of U-shaped magnetic conductor are bent to form downwards fixed part, fixed part upper end is connected with power buggy bottom resilient by holddown spring, and fixed part lower end then contacts with conductive surface to be measured.
The present invention also provides for a kind of defect in conductor magnetic and closes 9 Cr 2 steel using electromagnetic heating excitation detection method, comprises the steps:
Step one: received by excitation coil on the sine wave signal generator of frequency-adjustable, power adjustable, estimates the minimum frequency that do not penetrate through under this conductor thickness to be measured, and adjusts this frequency separation；
Step 2: open thermal camera, absorbs infrared temperature field picture with unit speed facing to the magnetic closed channel under power buggy；
Step 3: drive power buggy to travel at the uniform speed on conductor to be measured, opens sine wave signal generator simultaneously and produces exciting current；
Step 4: process Infrared Image Information, extracts isothermal chart and waits temperature rate figure；
Step 5: according to or without hot spot, the size of hot spot and isothermal chart, etc. temperature rate figure whether extremely judge whether defect exists and the size of defect；
Step 6: judge depth of defect after finding existing defects, after former low-frequency excitation cools down, regulate driving frequency from low frequency to intermediate frequency, arrive high frequency again, encourage once after often adjusting frequency, adjusting frequency excitation again after the coolings such as needs, high frequency still occurs that defect phenomenon means that defect is in top layer, the like；
Step 7: move in circles until whole conductor to be measured covered by power buggy.
The invention has the beneficial effects as follows: the defect in conductor magnetic of energy magnetic conduction of the present invention closes 9 Cr 2 steel using electromagnetic heating excitation detecting device and detection method based on electromagnetic induction and eddy current effects principle, adopt electromagnetic heating method, different frequencies can be selected, waveform, power carries out thermal excitation, event can be carried out local excitation, only conductor pcrmeability to be excited is consistent with resistivity, in exciting power, frequency is constant, when heat time heating time is basically identical, by the detection to the dynamic heating and cooling process in heated position, just can find out conductive surface and deeper defect, it is easy to operation, flexible adjustment is convenient, accuracy of detection is higher.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
The defect in conductor magnetic that Fig. 1 is energy magnetic conduction of the present invention closes the perspective view that 9 Cr 2 steel using electromagnetic heating encourages a preferred embodiment of detecting device；
Fig. 2 is the close-up schematic view of I part in Fig. 1；
In figure: 1. power buggy, 2. running wheel, 3. drive motor, 4.U type magnetic conductor, 41. thermal excitation heating parts, 42. fixed parts, 5. excitation coil, 6. holddown spring.
Detailed description of the invention
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, and the basic structure of the present invention is only described in a schematic way, and therefore it only shows the composition relevant with the present invention.
As shown in Figure 1 and Figure 2, the defect in conductor magnetic of a kind of energy magnetic conduction closes 9 Cr 2 steel using electromagnetic heating excitation detecting device, including power buggy 1, U-shaped magnetic conductor 3, excitation coil 5 and holddown spring 6, described U-shaped magnetic conductor 4 is fixed on power buggy 1 bottom end, described U-shaped magnetic conductor 4 includes integrated thermal excitation heating part 41 and fixed part 42, described fixed part 42 is arranged on two ends, thermal excitation heating part 41, described excitation coil 5 is set on thermal excitation heating part 41, and described fixed part 42 is connected with power buggy 1 elasticity by holddown spring 6.
Being evenly arranged with three running wheels 2 in described power buggy 1, running wheel 2 is embedded in the groove of power buggy 1, and running wheel 2 is connected with drive motor 3, and drive motor 3 controls power buggy 1 by running wheel 2 and moves or turn to.
Described U-shaped magnetic conductor 4 is ferrite, the thermal excitation heating part 41 of U-shaped magnetic conductor 4 is a rectangle cylinder, its width is corresponding with the diameter of excitation coil 5, the two ends of U-shaped magnetic conductor 4 are bent to form downwards fixed part 42, fixed part 42 upper end is connected with power buggy 1 bottom resilient by holddown spring 6, and fixed part 42 lower end then contacts with conductive surface to be measured.
The present invention also provides for the defect in conductor magnetic of a kind of energy magnetic conduction and closes 9 Cr 2 steel using electromagnetic heating excitation detection method, comprises the steps:
Step one: received on the sine wave signal generator of frequency-adjustable, power adjustable by excitation coil 5, estimates the minimum frequency that do not penetrate through under this conductor thickness to be measured, and adjusts this frequency separation；
Step 2: open thermal camera, with the speed of tens sub-pictures/second, absorbs infrared temperature field picture facing to the magnetic closed channel under power buggy 1；
Step 3: drive power buggy 1 to travel at the uniform speed on conductor to be measured, opens sine wave signal generator simultaneously and produces exciting current；
Step 4: process Infrared Image Information, extracts isothermal chart and waits temperature rate figure；
Step 5: according to or without hot spot, the size of hot spot and isothermal chart, etc. temperature rate figure whether extremely judge whether defect exists and the size of defect；
Step 6: judge depth of defect after finding existing defects, after former low-frequency excitation cools down, regulate driving frequency from low frequency to intermediate frequency, arrive high frequency again, encourage once after often adjusting frequency, adjusting frequency excitation again after the coolings such as needs, high frequency still occurs that defect phenomenon means that defect is in top layer, the like；
Step 7: move in circles until whole conductor to be measured covered by power buggy 1.
nullOperation principle of the present invention is as follows: thermal excitation heating part 41 on U-shaped magnetic conductor 4 is close is wound with ac-excited coil 5，Magnetic loop is formed in order to be in close contact with measured object below，U-shaped magnetic conductor 4 is fitted with holddown spring 6，When excitation coil 5 passes to alternating current，The measured conductor forming loop with U-shaped magnetic conductor 4 will produce current vortex heat effect，And send infrared thermal wave，Heating dwell times certain (utilizing power buggy 1 at the uniform velocity to move)、Magnetic circuit sectional area is equal (adjusts driving frequency，Do not cause on the conductor of became uneven and encouraged deep and had partial penetration leakage field)、When exciting power is equal，Power buggy 1 is passed by time interval certain time the infrared image of (such as tens ms)，And image is transferred to temperature field each point isothermal chart，It may determine that form on the measured conductor of loop whether existing defects with U-shaped magnetic conductor 4；Further process, extract the change of heating rate on the measured conductor of loop and namely extract intensification point derivative (or discrete differential), and the speed temperature lift-down curve such as make, can more obviously find out the existence of defect in conductor circuit, this is because exist without defect in the measured conductor of loop, its pcrmeability and resistivity are of substantially equal, and before and after power buggy 1 is passed by, the heating rate size of each point that heats up is of substantially equal；If and there is internal flaw, then owing to its pcrmeability declines and resistivity rises, diminish at the whole loop measured conductor magnet passage eddy current that powers on, and owing to fault location forms new inner surface leakage field point, there is surface electrical eddy current " kelvin effect " current vortex on the contrary to increase and be rapidly heated, then on this measured conductor magnet passage, temperature is no longer uniform, but defective place temperature is higher than the place that other dollies are passed by, the uneven temperature field phenomenon that other each point on same passage is lower than other each point again, show that on infrared image, substantially (this closed magnetic path channel defect place is bright compared with other zero defect passage for same closed magnetic path passage light and shade contrast, this passage zero defect place is darker than other zero defect passage), normal condition does not then have obvious contrast difference.
Compared with prior art, the defect in conductor magnetic of energy magnetic conduction of the present invention closes 9 Cr 2 steel using electromagnetic heating excitation detecting device and detection method based on electromagnetic induction and eddy current effects principle, adopt electromagnetic heating method, different frequencies can be selected, waveform, power carries out thermal excitation, event can be carried out local excitation, only conductor pcrmeability to be excited is consistent with resistivity, in exciting power, frequency is constant, when heat time heating time is basically identical, by the detection to the dynamic heating and cooling process in heated position, just can find out conductive surface and deeper defect, it is easy to operation, flexible adjustment is convenient, accuracy of detection is higher.
With the above-mentioned desirable embodiment according to the present invention for enlightenment, by above-mentioned description, relevant staff in the scope not necessarily departing from this invention technological thought, can carry out various change and amendment completely.The technical scope of this invention is not limited to the content in description, it is necessary to determine its technical scope according to right.
Claims (3)
1. the defect in conductor magnetic of an energy magnetic conduction closes 9 Cr 2 steel using electromagnetic heating excitation detection method, it is characterized in that: it adopts the defect in conductor magnetic of energy magnetic conduction to close 9 Cr 2 steel using electromagnetic heating excitation detecting device, the defect in conductor magnetic of energy magnetic conduction is closed 9 Cr 2 steel using electromagnetic heating excitation detecting device and is included power buggy, U-shaped magnetic conductor, excitation coil and holddown spring, described U-shaped magnetic conductor is fixed on power buggy bottom end, described U-shaped magnetic conductor includes integrated thermal excitation heating part and fixed part, described fixed part is arranged on two ends, thermal excitation heating part, described excitation coil is set on thermal excitation heating part, described fixed part is connected with power buggy elasticity by holddown spring, method comprises the steps:
Step one: received by excitation coil on the sine wave signal generator of frequency-adjustable, power adjustable, estimates the minimum frequency that do not penetrate through under conductor thickness to be measured, and adjusts this frequency separation；
Step 2: open thermal camera, absorbs infrared temperature field picture with unit speed facing to the magnetic closed channel under power buggy；
Step 3: drive power buggy to travel at the uniform speed on conductor to be measured, opens sine wave signal generator simultaneously and produces exciting current；
Step 4: process Infrared Image Information, extracts isothermal chart and waits temperature rate figure；
Step 5: according to or without hot spot, the size of hot spot and isothermal chart, etc. temperature rate figure whether extremely judge whether defect exists and the size of defect；
Step 6: judge depth of defect after finding existing defects, after former low-frequency excitation cools down, regulate driving frequency from low frequency to intermediate frequency, arrive high frequency again, encourage once after often adjusting frequency, adjusting frequency excitation again after the coolings such as needs, high frequency still occurs that defect phenomenon means that defect is in top layer, the like；
Step 7: move in circles until whole conductor to be measured covered by power buggy.
2. the defect in conductor magnetic of energy magnetic conduction closes 9 Cr 2 steel using electromagnetic heating excitation detection method as claimed in claim 1, it is characterised in that: being evenly arranged with some running wheels in described power buggy, described running wheel is connected with drive motor.
3. the defect in conductor magnetic of energy magnetic conduction closes 9 Cr 2 steel using electromagnetic heating excitation detection method as claimed in claim 1, it is characterised in that: described U-shaped magnetic conductor is ferrite.
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| CN105301093B (en) * | 2015-10-21 | 2019-01-22 | 北京原力辰超导技术有限公司 | A kind of superconducting coil defective locations detection system |
| CN111678948B (en) * | 2020-06-02 | 2022-07-19 | 四川大学 | High-speed nondestructive detection method for surface defects of steel rail and implementation device thereof |
| CN113484406A (en) * | 2021-07-21 | 2021-10-08 | 南京工程学院 | Material internal defect detection device and defect detection method thereof |
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| JPH05240815A (en) * | 1991-12-18 | 1993-09-21 | Daido Steel Co Ltd | Method and device for induction heating flaw detecting |
| JP2006200954A (en) * | 2005-01-19 | 2006-08-03 | Toyota Motor Corp | Mold cavity detection method and mold cavity detector |
| CN103399037B (en) * | 2013-08-08 | 2016-05-18 | 南昌航空大学 | Active infra-red tubing defect inspection method based on electromagnetic induction heating |
| CN103487443B (en) * | 2013-10-11 | 2015-10-14 | 福州大学 | A kind of defect of pipeline infrared detection system based on electromagnetic induction thermal excitation method |
| CN103558249B (en) * | 2013-11-05 | 2015-11-18 | 福州大学 | Based on the defect of metallic member infrared detection method of pulse current electromagnetic thermal effect |
| CN203798764U (en) * | 2014-04-17 | 2014-08-27 | 江苏理工学院 | Magnetic-closed electromagnetic thermal excitation detection device for conductor defects capable of conducting magnetism |
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Effective date of registration: 20170424 Address after: 215535 Changshou City, Jiangsu Province, the East Branch of the King Road, Jiangsu Co-patentee after: JIANGSU University OF TECHNOLOGY Patentee after: CHANGSHU KAIBO STAINLESS EQUIPMENT Co.,Ltd. Address before: 213001 Changzhou Province in the Clock Tower District, Jiangsu, Wu Road, No. 1801 Patentee before: Jiangsu University of Technology |
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Effective date of registration: 20230712 Address after: 215535 Dongxu Avenue, Dongbang Town, Changshu City, Suzhou City, Jiangsu Province Patentee after: Changshu DONGBANG Technology Venture Capital Development Co.,Ltd. Address before: 215535 DONGBANG zhengzhiwang Road, Changshu City, Jiangsu Province Patentee before: CHANGSHU KAIBO STAINLESS EQUIPMENT Co.,Ltd. Patentee before: JIANGSU University OF TECHNOLOGY |
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