CN203350226U - Magnetic flaw detection sensor based on giant magnetoresistance elements - Google Patents
Magnetic flaw detection sensor based on giant magnetoresistance elements Download PDFInfo
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- CN203350226U CN203350226U CN 201320427681 CN201320427681U CN203350226U CN 203350226 U CN203350226 U CN 203350226U CN 201320427681 CN201320427681 CN 201320427681 CN 201320427681 U CN201320427681 U CN 201320427681U CN 203350226 U CN203350226 U CN 203350226U
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Abstract
The utility model provides a magnetic flaw detection sensor based on giant magnetoresistance elements. The magnetic flaw detection sensor comprises an excitation mechanism and a sensor body, wherein the sensor body is formed by combining a plurality of giant magnetoresistance elements, and is positioned between two magnetic poles of the excitation mechanism. The magnetic flaw detection sensor based on the giant magnetoresistance elements has the advantages that the sensor body is formed by combining the plurality of giant magnetoresistance elements, and thus the space discriminability of measurement is improved and the coverage range of measurement is enlarged, a magnetism collecting device is additionally arranged for collecting, guiding and homogenizing a magnetic field, the detection sensitivity is high so that a weak magnetic field can be measured, the stability is good so that a bad condition can be tolerated; the structure is light, the convenience is brought and the cost is low.
Description
Technical field
The utility model relates to metal defect nondestructive examination field, relates in particular to a kind of magnetic fault detector of mainly by a plurality of giant magnetoresistance elements, the magnetic flux of the inside of ferromagnetic material or surface leakage being surveyed.
Background technology
Magnetic field can make the resistance of many metals change, only this variation is very little, generally be no more than 2%, this resistance variations caused due to magnetic field is called magnetoresistance effect, and in multilayer film (Fe/Cr) N that the people such as Baibich find to form at Fe, Cr alternating deposit, its magnetoresistive ratio has reached 50%, is called as giant magnetoresistance effect.Utilize giant magnetic resistor material to the Weak magentic-field sensing, to make the high sensitivity Magnetic Sensor.
The method of detection of metal defect has a lot, and radiographic inspection, magnetic powder inspection, UT (Ultrasonic Testing), magnetic leakage detection etc. are arranged.Because radiographic inspection easily damages human body, and magnetic powder inspection and ultrasonic inspection efficiency are lower and pollution is arranged, so direct current magnetic leakage detection metal defect used basically.But, in some occasion inapplicable, be mainly because of expensive, complex structure, use inconvenience.Now adopt Hall element leakage field sensors, but its sensitivity is low more.
Summary of the invention
It is a kind of highly sensitive that the purpose of this utility model is to provide, and can measure Weak magentic-field, and good stability, can tolerate the magnetic flaw detection sensor based on the giant magnetoresistance element of mal-condition.
To achieve these goals, the magnetic flaw detection sensor based on the giant magnetoresistance element for detection of metal surface or bottom defect that the utility model provides, comprise: excitation mechanism and sensor, sensor is that a plurality of giant magnetoresistance elements combinations form, sensor is between excitation mechanism two magnetic poles.Thus, excitation mechanism forms field signal and the sensor measurement field signal is two essential parts of the magnetic flaw detection sensor based on the giant magnetoresistance element of the present utility model, adopt the giant magnetoresistance element to be synchronized with the movement with excitation mechanism as sensor, utilize excitation mechanism to magnetize metal to be measured, faint leakage field detected during to defect by sensor scan, and magnetic signal is transformed into to electric signal output, and then then carry out the processing needed.
In some embodiments, the sensor periphery is provided with field shaper.Field shaper is collected leakage field, and has the effect in guiding, homogenising magnetic field, leakage field is directed in the detection path of sensor.
In some embodiments, field shaper is the NiFe alloy.
In some embodiments, field shaper is trapezoid block.
In some embodiments, be provided with two field shapers, lay respectively between sensor and excitation mechanism two magnetic poles.
In some embodiments, excitation mechanism comprises one " C " shape magnetic conduction connector, and is positioned at the magnetizing exciter at magnetic conduction connector two ends, and two magnetizing exciters form two magnetic poles of stating excitation mechanism.
In some embodiments, magnetizing exciter is the NdFeB permanent magnet.
In some embodiments, the magnetic conduction connector is connected by copper sheet with magnetizing exciter.
In some embodiments, in the magnetizing exciter both sides, by copper sheet, it is connected with the magnetic conduction connector.
Magnetic flaw detection sensor based on the giant magnetoresistance element of the present utility model compared with prior art, has the following advantages:
1. the magnetic flaw detection sensor based on the giant magnetoresistance element of the present utility model, it is highly sensitive, can measure Weak magentic-field, and good stability, can tolerate mal-condition.
2. the magnetic flaw detection sensor based on the giant magnetoresistance element of the present utility model, sensor adopts a plurality of giant magnetoresistance elements combinations, improves spatial discrimination power and the coverage measured, and has added field shaper, collection, guiding, homogenising magnetic field.
3. the magnetic flaw detection sensor based on the giant magnetoresistance element of the present utility model, light and handy, use portable, cost is low.
The accompanying drawing explanation
The structural representation of the magnetic flaw detection sensor based on the giant magnetoresistance element that Fig. 1 is a kind of embodiment of the utility model;
The structural representation that Fig. 2 is excitation mechanism in the magnetic flaw detection sensor based on the giant magnetoresistance element shown in Fig. 1;
The distribution schematic diagram that Fig. 3 is field shaper and sensor in the magnetic flaw detection sensor based on the giant magnetoresistance element shown in Fig. 1.
Embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail to explanation.
Obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making under the creative work prerequisite the every other embodiment obtained, and all belong to the scope of the utility model protection.
Fig. 1 to Fig. 3 has schematically shown the magnetic flaw detection sensor based on the giant magnetoresistance element according to a kind of embodiment of the utility model.
As shown in Figure 1, the magnetic flaw detection sensor based on the giant magnetoresistance element for detection of metal surface or bottom defect of the present utility model, comprising: excitation mechanism 10, sensor 20 and field shaper 30.Sensor 20 forms for a plurality of giant magnetoresistance elements combinations, and sensor 20 and field shaper 30 are between 10 liang of magnetic poles of excitation mechanism.
As Fig. 2, excitation mechanism 10 comprises one " C " shape magnetic conduction connector 101, and magnetizing exciter 102, two magnetizing exciters 102 that are positioned at magnetic conduction connector 101 two ends form two magnetic poles of stating excitation mechanism 10, in magnetizing exciter 102 both sides, by copper sheet 103, it is connected with magnetic conduction connector 101.Magnetic conduction connector 101 is high magnetic conductive material, and magnetizing exciter 102 is the NdFeB permanent magnet.
As shown in figures 1 and 3, be provided with two field shapers 30, lay respectively between 10 liang of magnetic poles of sensor 20 and excitation mechanism.The trapezoid block that field shaper 30 is the NiFe alloy, be positioned at sensor 20 both sides.
The leak detection principle of work of giant magnetoresistance element is: take magnetic field as medium, with excitation mechanism, magnetize measured material.When there is the magnetic permeability of this regional area of defect (as crackle time) in material surface, reduce, magnetic resistance increases, and causes the magnetic line of force to produce and distort and be diffused into the detectable stray field signal of formation outside material.Adopt the sensor of giant magnetoresistance element to be synchronized with the movement with excitation mechanism, faint leakage field detected while scanning defect, the magnetoelectricity signal of while output abnormality, in order to carry out the processing needed.
Magnetic flaw detection sensor based on the giant magnetoresistance element of the present utility model, metal 1 to be measured is located at excitation mechanism magnetic pole one side, by the NdFeB permanent magnet, as magnetizing exciter, magnetizes metal 1 to be measured, if metal does not have defect, the magnetic line of force evenly, through metal, does not have leakage field; When metal inside or surperficial defective the time, have leakage field and produce.The stray field that the field shaper collection space distributes, and it is directed in the detection path of giant magnetoresistance element, the giant magnetoresistance element is transformed into electric signal output by magnetic signal.
In sum, magnetic flaw detection sensor based on the giant magnetoresistance element of the present utility model, sensor adopts a plurality of giant magnetoresistance elements combinations, improve spatial discrimination power and the coverage measured, and added field shaper, collection, guiding, homogenising magnetic field, its detection sensitivity is high, can measure Weak magentic-field, and good stability, can tolerate mal-condition; Lightly, use portable, cost is low.
Claims (9)
1. the magnetic flaw detection sensor based on the giant magnetoresistance element, magnetic fault detector for detection of metal surface or bottom defect, it is characterized in that, comprise: excitation mechanism (10) and sensor (20), described sensor (20) forms for a plurality of giant magnetoresistance elements combinations, and described sensor (20) is positioned between described excitation mechanism (10) two magnetic poles.
2. the magnetic flaw detection sensor based on the giant magnetoresistance element according to claim 1, is characterized in that, described sensor (20) periphery is provided with field shaper (30).
3. the magnetic flaw detection sensor based on the giant magnetoresistance element according to claim 2, is characterized in that, described field shaper (30) is the NiFe alloy.
4. the magnetic flaw detection sensor based on the giant magnetoresistance element according to claim 3, is characterized in that, described field shaper (30) is trapezoid block.
5. the magnetic flaw detection sensor based on the giant magnetoresistance element according to claim 4, is characterized in that, is provided with two described field shapers (30), lays respectively between described sensor (20) and described excitation mechanism (10) two magnetic poles.
6. the magnetic flaw detection sensor based on the giant magnetoresistance element according to claim 1 or 5, it is characterized in that, described excitation mechanism (10) comprises one " C " shape magnetic conduction connector (101), and being positioned at the magnetizing exciter (102) at described magnetic conduction connector (101) two ends, described two magnetizing exciters (102) form described two magnetic poles of stating excitation mechanism (10).
7. the magnetic flaw detection sensor based on the giant magnetoresistance element according to claim 6, is characterized in that, described magnetizing exciter (102) is the NdFeB permanent magnet.
8. the magnetic flaw detection sensor based on the giant magnetoresistance element according to claim 7, is characterized in that, described magnetic conduction connector (101) is connected by copper sheet (103) with described magnetizing exciter (102).
9. the magnetic flaw detection sensor based on the giant magnetoresistance element according to claim 8, is characterized in that, in described magnetizing exciter (102) both sides, by copper sheet (103), it is connected with magnetic conduction connector (101).
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320427681 CN203350226U (en) | 2013-07-18 | 2013-07-18 | Magnetic flaw detection sensor based on giant magnetoresistance elements |
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| CN 201320427681 CN203350226U (en) | 2013-07-18 | 2013-07-18 | Magnetic flaw detection sensor based on giant magnetoresistance elements |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588876A (en) * | 2015-12-10 | 2016-05-18 | 中国石油天然气集团公司 | Continuous tube defect online detection device |
| CN108636311A (en) * | 2018-07-03 | 2018-10-12 | 欧阳晓群 | A kind of fluid permanent magnetic magnetizing device |
| CN109324112A (en) * | 2018-10-09 | 2019-02-12 | 河海大学 | A kind of gate detection robot and detection method based on giant magnetoresistance element |
-
2013
- 2013-07-18 CN CN 201320427681 patent/CN203350226U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588876A (en) * | 2015-12-10 | 2016-05-18 | 中国石油天然气集团公司 | Continuous tube defect online detection device |
| CN108636311A (en) * | 2018-07-03 | 2018-10-12 | 欧阳晓群 | A kind of fluid permanent magnetic magnetizing device |
| CN109324112A (en) * | 2018-10-09 | 2019-02-12 | 河海大学 | A kind of gate detection robot and detection method based on giant magnetoresistance element |
| JP2022504536A (en) * | 2018-10-09 | 2022-01-13 | 河海大学 | Inspection robot and inspection method for floodgates based on giant magnetoresistive element |
| JP7111405B2 (en) | 2018-10-09 | 2022-08-02 | 河海大学 | Inspection robot for water gate based on giant magnetoresistive element and inspection method for water gate |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: JIANGSU HINANO PRECISION EQUIPMENT CO., LTD. Free format text: FORMER NAME: JIANGSU HINANO PRECISION ASSEMBLY + NANO MATERIALS CO., LTD. |
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| CP03 | Change of name, title or address |
Address after: 226009 Jiangsu city of Nantong Province, Nantong economic and Technological Development Zone, Road No. 1692 building 10 Yuan electric machine on the east side of the bottom Patentee after: JIANGSU HINANO PRECISION ASSEMBLY CO., LTD. Address before: 226000 Jiangsu city of Nantong province Nantong michimori economic and Technological Development Zone, Road No. 188 B block 4 layer Patentee before: Jiangsu Haina Magnetic Nano New Material Technology Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131218 Termination date: 20170718 |