CN204255905U - For the array eddy current sensor of metal pipe internal wall defects detection - Google Patents
For the array eddy current sensor of metal pipe internal wall defects detection Download PDFInfo
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- CN204255905U CN204255905U CN201420780893.1U CN201420780893U CN204255905U CN 204255905 U CN204255905 U CN 204255905U CN 201420780893 U CN201420780893 U CN 201420780893U CN 204255905 U CN204255905 U CN 204255905U
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Abstract
The utility model discloses a kind of array eddy current sensor for metal pipe internal wall defects detection, comprise stay pipe and be attached to the flexible PCB on stay pipe excircle, the flexible substrates of flexible PCB is provided with drive coil and magnetic test coil array, and magnetic test coil array comprises equally distributed multiple magnetic test coil.The utility model can realize the defects detection of all directions in metal pipe internal wall simultaneously, has the advantage that resolution that is simple and compact for structure, with low cost, that simultaneously detect the strong adaptability of detected object, detection efficiency height is high.
Description
Technical field
The utility model relates to the technical field of nondestructive testing of metallic conduit, particularly relates to a kind of array eddy current sensor for metal pipe internal wall defects detection.
Background technology
In current inner-walls of duct defect inspection method, Magnetic testing, the conventional methods such as Liquid penetrant testing and acoustic emission detection method due to the operation at pipe interior extremely inconvenient, thus operability and practicality are not strong, although the detection means having some new is (as metal magnetic memory test, infrared detection, the new detection methods such as laser hologram detection and microwave detection are applied to pipe detection) pipe interior operational issue can be solved, but the application technology specifically in pipe detection is also still immature, thus the more method of application mainly contains ray detection at present, Ultrasonic Detection, industrial endoscope detects and a few class detection method of EDDY CURRENT, but all kinds of detection method also all has certain limitation.
Ray detection method is only higher to the detection sensitivity of the pore in pipe welding seam, slag inclusion and loose equal-volume type defect, lower to the detection sensitivity of planar disfigurement, and there is equipment complex and expensive, the shortcoming such as radiativity is strong, detection efficiency is low, testing result is easily affected by human factors, thus its range of application is very limited.
Supersonic detection method has the advantages such as penetration capacity is strong, equipment is simple, security is good, be widely used in pipe detection, but there is following defect in ultrasonic detecting technology: 1. by employing contact energy-changing method, need the couplant such as grease or water, therefore be subject to outside interference, and on curved surface, easily cause the bad phenomenon such as coupling while of having an impact to tube wall; 2. there is certain blind area, near field, easily cause undetected to pipeline near surface flaw, be not suitable for detecting sheet-metal duct; 3., when carrying out Ultrasonic Detection to ducted weld seam, response signal and the baseline noise of the uneven generation of face of weld are easily obscured, and make detection difficulty large.
The precision of industrial endoscope detection method is higher and easily be automated, carry out tool in quick position and measuring process corrode inner surface of pipeline and crackle etc. to have an enormous advantage, industrial endoscope conventional at present has rigid endoscope, flexible endscope and electric video endoscope three kinds, but three kinds of sight glass exist following problem respectively: the 1. inflexibility of rigid endoscope main body and limited length, be therefore only applicable to the shorter straight tube of distance and detect; Although 2. flexible endscope main body is flexible and length is longer, can detect the little bend pipe of bending angle or the longer straight tube of distance, but ask the fibre-optic bundle quantity of connection and the impact of light transmissioning efficiency by object lens and eyepiece, the image definition obtained when ccd sensor carries out imaging is connect poor, simultaneously glass optical fiber frangibility when bending angle is excessive from eyepiece; Although 3. electric video endoscope has the high and flexible advantage of flexible endscope main body of rigid endoscope image quality concurrently, but integral link is more, be not easy to carry, such as except endoscope head, arbitrary source and Optic transmission fiber, also need special Video Controller and display unit.
Eddy current detection method is a kind of lossless detection method be based upon on electromagnetic induction principle basis, has sensor fast response time, highly sensitive, noncontact, without the need to advantages such as couplants, is thus specially adapted to the detection to metal pipe internal wall defect.But there is contradiction and to problems such as the bad adaptability of detected object in the impact that consistance is poor, detection signal is subject to the factors such as lift-off of traditional nondestructive detecting technology of vortex ubiquity sensor, detection efficiency and resolution.
Utility model content
The technical problems to be solved in the utility model overcomes the deficiencies in the prior art, a kind of array eddy current sensor for metal pipe internal wall defects detection that can realize metal pipe internal wall all directions simultaneously and detect is provided, there is the advantage that resolution that is simple and compact for structure, with low cost, that simultaneously detect the strong adaptability of detected object, detection efficiency height is high.
For solving the problems of the technologies described above, the technical scheme that the utility model proposes is:
A kind of array eddy current sensor for metal pipe internal wall defects detection, comprise stay pipe and be attached to the flexible PCB on stay pipe excircle, the flexible substrates of described flexible PCB is provided with drive coil and magnetic test coil array, and described magnetic test coil array comprises equally distributed multiple magnetic test coil.
Preferably, the flexible substrates of described flexible PCB is pasted onto on stay pipe.
Preferably, the flexible substrates of described flexible PCB is pasted onto on stay pipe by adhering to glue-line.
Preferably, the outer wrap of described flexible PCB has layer protecting film.
Preferably, described drive coil periodic arrangement is square-wave-shaped, and described magnetic test coil is arranged in the square wave recess of drive coil respectively, and between described drive coil and magnetic test coil, gap is arranged.
Preferably, the quantity of described magnetic test coil is identical with the square wave quantity of half period in drive coil.
Preferably, the live width of described drive coil is greater than the live width of magnetic test coil.
Preferably, the number of described magnetic test coil is 8 ~ 16.
Preferably, described array eddy current sensor also comprises current source, and described drive coil is connected with current source.
Preferably, described array eddy current sensor also comprises signal acquisition process unit, described signal acquisition process unit comprises signal acquisition processing circuit and multiple amplifier, described amplifier and magnetic test coil one_to_one corresponding, the output terminal of described magnetic test coil is connected with signal acquisition processing circuit respectively by the amplifier of correspondence.
Compared with prior art, the utility model has the advantage of: the utility model array eddy current sensor, adopt flexible PCB to be attached on stay pipe and form columned detection bodies, detection bodies can be stretched in metallic conduit easily detect, and can effectively suppress lift-off to be disturbed, improve the adaptability of inner wall surface, the particularly complex surface of detected object; Flexible PCB is provided with drive coil and multiple equally distributed magnetic test coil, ensure that the consistance of sensor, can detect the defect of metal pipe internal wall all directions simultaneously, while improving detection efficiency, improve the sensitivity detected and resolution.
Accompanying drawing explanation
Fig. 1 is the structural principle schematic diagram of the utility model embodiment.
Fig. 2 is the cross-sectional structure schematic diagram of stay pipe and periphery thereof in the utility model embodiment.
Marginal data:
1, stay pipe; 2, flexible PCB; 21, drive coil; 211, square wave recess; 22, magnetic test coil; 3, glue-line is adhered to; 4, diaphragm; 5, current source; 6, signal acquisition process unit; 61, signal acquisition processing circuit; 62, amplifier.
Embodiment
Below in conjunction with Figure of description and concrete preferred embodiment, the utility model is further described, but does not therefore limit protection domain of the present utility model.
As shown in Figure 1, 2, the utility model is used for the array eddy current sensor of metal pipe internal wall defects detection, comprise: comprise stay pipe 1 and be attached to the flexible PCB 2 on stay pipe 1 excircle, the flexible substrates of flexible PCB 2 is provided with drive coil 21 and magnetic test coil array, and magnetic test coil array comprises equally distributed multiple magnetic test coil 22.The stay pipe 1 being attached with flexible PCB 2 is stretched in metallic conduit and can be detected, and detection easy and simple to handle also can effectively suppress lift-off to be disturbed, and improves the adaptability to inner-walls of duct surface, the particularly complex surface detected; After drive coil 21 produces eddy current in metallic conduit to be measured, the induced voltage that all directions obtain by electromagnetic induction is detected by equally distributed each magnetic test coil 22, sensor is made to have good consistance, the defect of metal pipe internal wall all directions can be detected simultaneously, while improving detection efficiency, improve the sensitivity detected and resolution.
In the present embodiment, the external diameter of stay pipe 1 is slightly less than the internal diameter of metallic conduit to be detected, and its thickness is about 1 ~ 2mm and inside is hollow, can conveniently install signal conditioning circuit plate and outgoing cable by the hollow part of centre.Flexible PCB 2 adopts flexible base material polyimide to make, thickness is about 0.2 mm, and the width that flexible PCB 2 launches equals the girth corresponding to external diameter of stay pipe 1, make flexible PCB 2 can zero lap, be pasted onto uniformly on the outer wall of stay pipe 1.
See Fig. 2, in the present embodiment, flexible PCB 2 is pasted onto on stay pipe 1 by adhering to glue-line 3, is fixed by flexible PCB 2 by adhering to glue-line 3.Width due to flexible PCB 2 just in time equals the external diameter girth of stay pipe 1, after flexible PCB 2 being bent to an annulus, the left margin of flexible PCB 2 and right margin just in time will overlap and form complete, non-overlapping annulus, fixedly be pasted onto on the outer arm of stay pipe 1 by adhering to glue-line 3.
See Fig. 2, in the present embodiment, the outer wrap of flexible PCB 2 has layer protecting film 4, for carrying out insulation blocking to flexible PCB 2, prevents flexible PCB 2 to be worn.Diaphragm 4 can by pasting or being sprayed on flexible PCB 2, and diaphragm 4 specifically can adopt non-conducting material, such as polyimide etc.
The present embodiment array eddy current sensor adopts Multi-layer annular structure, is provided with stay pipe 1 from the inside to the outside successively, adheres to glue-line 3, flexible PCB 2 and diaphragm 4, and structure is simple, be convenient to carry out the detection of metal pipe internal wall and easy to make.The integral diameter of each Rotating fields must be slightly less than the internal diameter of metallic conduit to be measured, needs the gap reserving about 1mm, detect to extend in metal pipe internal wall between metallic conduit usual and to be measured.
In the present embodiment, flexible PCB 2 adopt etch process make a drive coil 21 and magnetic test coil array, magnetic test coil array comprises multiple equally distributed magnetic test coil 22, wherein drive coil 21 is in periodic structure, magnetic test coil 22 is uniformly distributed according to the periodic structure of drive coil 21, and the live width of drive coil 21 is greater than the live width of magnetic test coil 22, make drive coil 21 can bear larger exciting current and produce eddy current.
See Fig. 1, in the present embodiment, drive coil 21 periodic arrangement is square-wave-shaped, magnetic test coil 22 is arranged in the half period of the square wave recess 211(square wave of drive coil 21 respectively, only one of them is shown in figure) in, and gap is arranged between drive coil 21 and magnetic test coil 22, arrange near drive coil 21 by magnetic test coil 22, leave certain clearance space simultaneously and between drive coil 21.By square-wave-shaped drive coil 21 and the equally distributed magnetic test coil 22 in cycle, sensor is made to have consistance in the detection of all directions.The structure of drive coil 21 also can be set to other periodic shape as required, and magnetic test coil 22 is uniformly distributed according to the periodic structure of drive coil 21.
See Fig. 1, in the present embodiment, in each square wave recess 211 of drive coil 21, correspondence arranges a magnetic test coil 22, and the quantity of magnetic test coil 22 is identical with the square wave quantity of half period in drive coil 21.When the number of magnetic test coil 22 is determined, obtain the length of the half period wavelength of drive coil 21 divided by the number of magnetic test coil 22 by the spreading width of flexible PCB 2.The present embodiment magnetic test coil 22 specifically arranges 8, then drive coil 21 is in 4 square-wave-shapeds, and the half period wavelength of drive coil 21 is spreading width/8 of flexible PCB 2, and the number of magnetic test coil 22 also can be arranged as required, is preferably 8 ~ 16.
See Fig. 1, the present embodiment array eddy current sensor also comprises current source 5, and drive coil 21 is connected with current source 5, provides electric current by current source 5 to drive coil 21.
See Fig. 1, array eddy current sensor also comprises signal acquisition process unit 6, signal acquisition process unit 6 comprises signal acquisition processing circuit 61 and multiple amplifier 62, amplifier 62 and magnetic test coil 22 one_to_one corresponding, the output terminal of magnetic test coil 22 is connected with the input end of signal acquisition processing circuit 61 by corresponding amplifier 62.In the present embodiment, signal acquisition process unit 6 specifically comprises 8 amplifiers 62, and each amplifier 62 correspondence connects a magnetic test coil 22.
Above-mentioned array eddy current sensor is stretched in metallic conduit and detects, in metallic conduit to be measured, eddy current is produced after drive coil 21 accesses current source 5, each magnetic test coil 22 around drive coil 21 detects the induced voltage that all directions produce, induced voltage exports signal acquisition processing circuit 61 to after amplifier 62 amplifies, signal acquisition processing circuit 61 gathers the induced voltage that each amplifier 62 exports and to go forward side by side row relax, the testing result after output processing.
The above is only preferred implementation of the present utility model, protection domain of the present utility model be not only confined to above-described embodiment, and all technical schemes belonged under the utility model thinking all belong to protection domain of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (10)
1. the array eddy current sensor for metal pipe internal wall defects detection, it is characterized in that: comprise stay pipe (1) and be attached to the flexible PCB (2) on stay pipe (1) excircle, the flexible substrates of described flexible PCB (2) is provided with drive coil (21) and magnetic test coil array, and described magnetic test coil array comprises equally distributed multiple magnetic test coil (22).
2. the array eddy current sensor for metal pipe internal wall defects detection according to claim 1, is characterized in that: the flexible substrates of described flexible PCB (2) is pasted onto on stay pipe (1).
3. the array eddy current sensor for metal pipe internal wall defects detection according to claim 2, is characterized in that: the flexible substrates of described flexible PCB (2) is pasted onto on stay pipe (1) by adhering to glue-line (3).
4. the array eddy current sensor for metal pipe internal wall defects detection according to claim 3, is characterized in that: the outer wrap of described flexible PCB (2) has layer protecting film (4).
5. the array eddy current sensor for metal pipe internal wall defects detection according to claim 4, it is characterized in that: described drive coil (21) periodic arrangement is square-wave-shaped, described magnetic test coil (22) is arranged in the square wave recess (211) of drive coil (21) respectively, and between described drive coil (21) and magnetic test coil (22), gap is arranged.
6. the array eddy current sensor for metal pipe internal wall defects detection according to claim 5, is characterized in that: the quantity of described magnetic test coil (22) is identical with the square wave quantity of half period in drive coil (21).
7. the array eddy current sensor for metal pipe internal wall defects detection according to claim 6, is characterized in that: the live width of described drive coil (21) is greater than the live width of magnetic test coil (22).
8. the array eddy current sensor for metal pipe internal wall defects detection according to claim 7, is characterized in that: the number of described magnetic test coil (22) is 8 ~ 16.
9. according to the array eddy current sensor for metal pipe internal wall defects detection in claim 1 ~ 8 described in any one, it is characterized in that: described array eddy current sensor also comprises current source (5), described drive coil (21) is connected with current source (5).
10. according to claim 9 for the array eddy current sensor of metal pipe internal wall defects detection, it is characterized in that: described array eddy current sensor also comprises signal acquisition process unit (6), described signal acquisition process unit (6) comprises signal acquisition processing circuit (61) and multiple amplifier (62), described amplifier (62) and magnetic test coil (22) one_to_one corresponding, the output terminal of described magnetic test coil (22) is connected with signal acquisition processing circuit (61) respectively by the amplifier (62) of correspondence.
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| CN201420780893.1U CN204255905U (en) | 2014-12-12 | 2014-12-12 | For the array eddy current sensor of metal pipe internal wall defects detection |
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| CN201420780893.1U CN204255905U (en) | 2014-12-12 | 2014-12-12 | For the array eddy current sensor of metal pipe internal wall defects detection |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105301096A (en) * | 2015-11-20 | 2016-02-03 | 清华大学 | Array type flexible eddy current probe for hollow axle inner wall flaw detection |
| CN105588878A (en) * | 2016-01-07 | 2016-05-18 | 北京理工大学 | Eddy current array testing device for metal defects |
| CN106198637A (en) * | 2016-09-18 | 2016-12-07 | 中国石油大学(华东) | A kind of multi-electrode direct imaging for jacket tube defects detection is popped one's head in |
| CN108008005A (en) * | 2017-12-28 | 2018-05-08 | 中国特种设备检测研究院 | A kind of metallic conduit defects detection low frequency electromagnetic flexible array sensor |
| CN108037178A (en) * | 2017-12-28 | 2018-05-15 | 中国特种设备检测研究院 | A kind of Metal pipeline corrosion defects detection low frequency electromagnetic sensor array |
| CN108680641A (en) * | 2018-05-02 | 2018-10-19 | 中国人民解放军驻二三厂军事代表室 | Flexible array sensor based on vortex with ULTRASONIC COMPLEX |
| CN111220699A (en) * | 2020-03-09 | 2020-06-02 | 昆明理工大学 | Pipeline eddy nondestructive testing device and method based on annular array probe |
| CN111476092A (en) * | 2020-03-05 | 2020-07-31 | 平安科技（深圳）有限公司 | Data storage method and device based on Internet of vehicles and computer equipment |
| CN112834611A (en) * | 2021-01-22 | 2021-05-25 | 爱德森（厦门）电子有限公司 | Variable-diameter differential eddy current sensor detection method and device |
| CN116718357A (en) * | 2023-08-09 | 2023-09-08 | 昆山迈致治具科技有限公司 | Virtual image distance testing method and device |
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- 2014-12-12 CN CN201420780893.1U patent/CN204255905U/en active Active
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301096B (en) * | 2015-11-20 | 2019-04-23 | 清华大学 | Array-type flexible eddy current probe for the flaw detection of hole-bored axle from end to end inner wall |
| CN105301096A (en) * | 2015-11-20 | 2016-02-03 | 清华大学 | Array type flexible eddy current probe for hollow axle inner wall flaw detection |
| CN105588878A (en) * | 2016-01-07 | 2016-05-18 | 北京理工大学 | Eddy current array testing device for metal defects |
| CN106198637A (en) * | 2016-09-18 | 2016-12-07 | 中国石油大学(华东) | A kind of multi-electrode direct imaging for jacket tube defects detection is popped one's head in |
| CN108008005A (en) * | 2017-12-28 | 2018-05-08 | 中国特种设备检测研究院 | A kind of metallic conduit defects detection low frequency electromagnetic flexible array sensor |
| CN108037178A (en) * | 2017-12-28 | 2018-05-15 | 中国特种设备检测研究院 | A kind of Metal pipeline corrosion defects detection low frequency electromagnetic sensor array |
| CN108037178B (en) * | 2017-12-28 | 2024-03-08 | 中国特种设备检测研究院 | Low-frequency electromagnetic array sensor for detecting corrosion defects of metal pipeline |
| CN108680641A (en) * | 2018-05-02 | 2018-10-19 | 中国人民解放军驻二三厂军事代表室 | Flexible array sensor based on vortex with ULTRASONIC COMPLEX |
| CN111476092A (en) * | 2020-03-05 | 2020-07-31 | 平安科技（深圳）有限公司 | Data storage method and device based on Internet of vehicles and computer equipment |
| CN111476092B (en) * | 2020-03-05 | 2023-07-21 | 平安科技（深圳）有限公司 | Data storage method and device based on Internet of vehicles and computer equipment |
| CN111220699A (en) * | 2020-03-09 | 2020-06-02 | 昆明理工大学 | Pipeline eddy nondestructive testing device and method based on annular array probe |
| CN112834611A (en) * | 2021-01-22 | 2021-05-25 | 爱德森（厦门）电子有限公司 | Variable-diameter differential eddy current sensor detection method and device |
| CN112834611B (en) * | 2021-01-22 | 2024-04-09 | 爱德森（厦门）电子有限公司 | Variable diameter differential eddy current sensor detection method and device |
| CN116718357A (en) * | 2023-08-09 | 2023-09-08 | 昆山迈致治具科技有限公司 | Virtual image distance testing method and device |
| CN116718357B (en) * | 2023-08-09 | 2023-10-27 | 昆山迈致治具科技有限公司 | Virtual image distance testing method and device |
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