CN105699481A - Near-surface micro crack detection device of pressure equipment - Google Patents
Near-surface micro crack detection device of pressure equipment Download PDFInfo
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- CN105699481A CN105699481A CN201610160835.2A CN201610160835A CN105699481A CN 105699481 A CN105699481 A CN 105699481A CN 201610160835 A CN201610160835 A CN 201610160835A CN 105699481 A CN105699481 A CN 105699481A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
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Abstract
The invention relates to a near-surface micro crack detection device of pressure equipment. The near-surface micro crack detection device is characterized by consisting of a signal generator (1), a power amplifier (2), a magnetic yoke (3), an excitation coil (4), a first horizontal detection coil (5), a second horizontal detection coil (6), a vertical detection coil (7) and an oscilloscope (8), wherein the number of turns of the excitation coil (4) is 30, and the diameter of the excitation coil (4) is 15-20mm; the signal generator (1) generates a sinusoidal signal, and the sinusoidal signal is amplified by the power amplifier (2) to generate distribution of magnetic lines in the space through the excitation coil (4); the magnetic lines (10) overflow via a near-surface defect of pressure equipment (9); the first horizontal detection coil (5) is used for detecting the global magnetic field tangential component, the second horizontal detection coil (6) is used for detecting the local magnetic field tangential component, the vertical detection coil (7) is used for detecting the depth information of the defect, and a detection signal is displayed by the oscilloscope (8). The near-surface micro crack detection device has the advantages that the different detection coils are used for detecting the information of different sizes of defects, the detection accuracy of size parameter of the defect is improved, the operability is high, the innovation is good, and the near-surface micro crack detection device can be applied to various types of physical engineering.
Description
Technical field
A kind of bearing device nearly surface testing of small cracks device, belongs to electromagnetic nondestructive field。
Background technology
Boiler, pressure vessel, pressure pipeline are pressure-bearing class special equipment, and these equipment are manufactured by some metal materials mostly。Metallic material corrosion is thinning and the major security risk of stress concentration portion position cracking these pressure-bearing class special equipments often, therefore these defects carries out early stage Clinical significance of detecting great。
Existing detection technique is respectively arranged with certain limitation, for instance penetration detection temperature influence, must in advance surface of the work be processed, and detection process is loaded down with trivial details；Surface of the work must be processed by Magnetic testing technology in advance, and workpiece may cause during detection certain injury；X-ray Testing Technology has certain radiation risk, detect consuming time greatly, testing cost is high；Ultrasonic detection technology is by the impact of surface of the work smoothness, and testing result is difficult to be recorded permanently；Acoustic emission testing technology is subject to extraneous noise interference, launches signal and is easily weakened by workpiece and decay。Magnetic Flux Leakage Inspecting technology, by Magnetic testing technical development, is the lossless detection method utilizing magnetic phenomenon to detect metal defect, has the advantages such as easy to detect, workable, testing result is easily obtained。
Current Magnetic Flux Leakage Inspecting sensor often purposes is single, is all information being detected defect by same sensor。The present invention develops two class sensors simultaneously, for obtaining the degree of depth of defect, width information, has stronger novelty。
Summary of the invention
It is an object of the invention to provide a kind of bearing device nearly surface testing of small cracks device。For the size detection of defect, this device has higher accuracy of detection。
The present invention is achieved through the following technical solutions:
A kind of bearing device nearly surface testing of small cracks device, it is characterised in that: it is made up of signal generator (1), power amplifier (2), yoke (3), excitation coil (4), the first horizontal detection coil (5), the second horizontal detection coil (6), vertical detection coil (7), oscillograph (8)；The number of turn of excitation coil (4) is 30, and the diameter of excitation coil (4) is 15-20mm；Signal generator (1) produces a sinusoidal signal, after power amplifier (2) amplifies, signal can produce magnetic line of force distribution after excitation coil (4) in space, the defect on the nearly surface of bearing device (9) can make the magnetic line of force (10) overflow, first horizontal detection coil (5) is used for detecting overall situation magnetic field tangential component, second horizontal coil (6) is used for detecting local magnetic field tangential component, vertical detection coil (6) is for detecting the depth information of defect, and detection signal is shown by oscillograph (8)。
Described a kind of bearing device nearly surface testing of small cracks device, it is characterized in that: excitation coil (4), the first horizontal detection coil (5), the second horizontal detection coil (6), vertical detection coil (7) are by copper wire coiling, and brass wire diameter is 0.2-1mm。
Described a kind of bearing device nearly surface testing of small cracks device, it is characterised in that: the amplitude of exciting current is sized to 0.5-1A, and driving frequency is 10Hz-10KHz。
Described a kind of bearing device nearly surface testing of small cracks device, it is characterised in that: the first horizontal detection coil (5) length is 40-60mm, and the second horizontal detection coil (6) length is 10-20mm。
Described a kind of bearing device nearly surface testing of small cracks device, it is characterised in that: the material of yoke (3) is manganese-zinc ferrite。
The operation principle of the present invention is: the pumping signal that signal generator (1) produces is loaded on the excitation coil (4) of yoke (3) after power amplifier (2) amplifies, according to Faraday law of electromagnetic induction, space can produce alternating magnetic field。When yoke (3) being placed on tested bearing device (9), constituting a Guan Bi flux loop between yoke (3), air, bearing device (9), the magnetic line of force is pressed magnetic resistance minimum principle and is propagated。When there is discontinuous defect in bearing device (9) surface, the magnetic line of force can walk around defect, pass through near defect, in short time, there is magnetic saturation in this region, some magnetic lines of force are caused to have to overflow the surface of bearing device (9), now, it is placed in the first horizontal detection coil (5) of bearing device (9) near surface, the second horizontal detection coil (6) and vertical detection coil (7) and senses this change, show via oscillograph (8), thus judging the existence of defect。
The invention has the beneficial effects as follows: described a kind of bearing device nearly surface testing of small cracks device is not by the impact of the environmental factors such as time, space, convenient and simple for operation。Additionally, described device adopts level, vertical two kinds of detection coils, the size detection of defect there is higher precision。
Accompanying drawing explanation
Fig. 1 is a kind of bearing device nearly surface testing of small cracks device of the present invention；
Fig. 2 is the different defect counts testing result schematic diagrams of the present invention；
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the invention will be further described:
Referring to accompanying drawing 1, a kind of bearing device nearly surface testing of small cracks device, it is characterised in that: it is made up of signal generator (1), power amplifier (2), yoke (3), excitation coil (4), the first horizontal detection coil (5), the second horizontal detection coil (6), vertical detection coil (7), oscillograph (8)；Signal generator (1) produces a sinusoidal signal, after power amplifier (2) amplifies, signal can produce magnetic line of force distribution after excitation coil (4) in space, the defect on the nearly surface of bearing device (9) can make the magnetic line of force (10) overflow, first horizontal detection coil (5) is used for detecting overall situation magnetic field tangential component, second horizontal coil (6) is used for detecting local magnetic field tangential component, vertical detection coil (7) is for detecting the depth information of defect, and detection signal is shown by oscillograph (8)。
Wherein, the first horizontal detection coil (5), the second horizontal detection coil (6) are for detecting the width information of defect, and vertical detection coil (7) is for detecting the depth information of defect。Fig. 2 is the testing result schematic diagram under different defect counts。
Claims (5)
1. a bearing device nearly surface testing of small cracks device, it is characterised in that: it is made up of signal generator (1), power amplifier (2), yoke (3), excitation coil (4), the first horizontal detection coil (5), the second horizontal detection coil (6), vertical detection coil (7), oscillograph (8)；The number of turn of excitation coil (4) is 30, and the diameter of excitation coil (4) is 15-20mm；Signal generator (1) produces a sinusoidal signal, after power amplifier (2) amplifies, signal can produce magnetic line of force distribution after excitation coil (4) in space, the defect on the nearly surface of bearing device (9) can make the magnetic line of force (10) overflow, first horizontal detection coil (5) is used for detecting overall situation magnetic field tangential component, second horizontal coil (6) is used for detecting local magnetic field tangential component, vertical detection coil (6) is for detecting the depth information of defect, and detection signal is shown by oscillograph (8)。
2. a kind of nearly surface of bearing device according to claim 1 testing of small cracks device, it is characterized in that: excitation coil (4), the first horizontal detection coil (5), the second horizontal detection coil (6), vertical detection coil (7) are by copper wire coiling, and brass wire diameter is 0.2-1mm。
3. a kind of nearly surface of bearing device according to claim 1 testing of small cracks device, it is characterised in that: the amplitude of exciting current is sized to 0.5-1A, and driving frequency is 10Hz-10KHz。
4. a kind of nearly surface of bearing device according to claim 1 testing of small cracks device, it is characterised in that: the first horizontal detection coil (5) length is 40-60mm, and the second horizontal detection coil (6) length is 10-20mm。
5. a kind of nearly surface of bearing device according to claim 1 testing of small cracks device, it is characterised in that: the material of yoke (3) is manganese-zinc ferrite。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610160835.2A CN105699481B (en) | 2016-03-18 | 2016-03-18 | A kind of bearing device near surface testing of small cracks device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610160835.2A CN105699481B (en) | 2016-03-18 | 2016-03-18 | A kind of bearing device near surface testing of small cracks device |
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| CN105699481A true CN105699481A (en) | 2016-06-22 |
| CN105699481B CN105699481B (en) | 2019-03-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404900A (en) * | 2016-11-02 | 2017-02-15 | 中国计量大学 | Device for detecting steel plate surface defect |
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| CN105092696A (en) * | 2015-08-10 | 2015-11-25 | 北京工业大学 | Low-frequency alternating-current magnetic flux leakage direction method for ferromagnetic pipeline inner wall crack detection |
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| JP4269653B2 (en) * | 2002-11-20 | 2009-05-27 | 株式会社島津製作所 | Manufacturing method of radiation detector |
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| JPS6472052A (en) * | 1987-09-14 | 1989-03-16 | Toshiba Shokoki Service | Flaw detector for steel tape of elevator |
| JPH02147950A (en) * | 1988-11-30 | 1990-06-06 | Hara Denshi Sokki Kk | Ac leakage magnetic flux detector for plane flaw |
| JPH04269653A (en) * | 1991-02-25 | 1992-09-25 | Nippon Telegr & Teleph Corp <Ntt> | Leakage magnetic flux detector |
| EP0855595A2 (en) * | 1997-01-22 | 1998-07-29 | Kawasaki Steel Corporation | Method and apparatus for locating coating faults on buried pipeline |
| JPH1183808A (en) * | 1997-09-10 | 1999-03-26 | Nkk Corp | Leakage flux flaw detecting method |
| CN1394279A (en) * | 2000-10-18 | 2003-01-29 | 川崎制铁株式会社 | Leakage magnetism detecting sensor of magnetic penetration apparatus |
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| CN106404900A (en) * | 2016-11-02 | 2017-02-15 | 中国计量大学 | Device for detecting steel plate surface defect |
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| CN105699481B (en) | 2019-03-26 |
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Inventor after: Shen Changyu Inventor after: Lou Weimin Inventor after: Shentu Fengying Inventor after: Guo Yuanyang Inventor after: Li Wenjun Inventor after: Zhou Jiajia Inventor after: Li Guanghai Inventor before: Lou Weimin Inventor before: Shentu Fengying Inventor before: Shen Changyu Inventor before: Guo Yuanyang Inventor before: Li Wenjun Inventor before: Zhou Jiajia Inventor before: Li Guanghai |
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