CN103675091A - Steel plate defect detector and detection method for same - Google Patents
Steel plate defect detector and detection method for same Download PDFInfo
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- CN103675091A CN103675091A CN201210356031.1A CN201210356031A CN103675091A CN 103675091 A CN103675091 A CN 103675091A CN 201210356031 A CN201210356031 A CN 201210356031A CN 103675091 A CN103675091 A CN 103675091A
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- steel plate
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Abstract
The invention discloses a steel plate defect detector, which comprises a magnetic field sensor, a sensor bracket, a sliding table, a guide rail, an electromagnet and a magnetization power supply, wherein the magnetic field sensor is used for measuring a leakage flux signal of the surface of a steel plate; the sensor bracket is fixedly connected with the magnetic field sensor, and is used for fixing the magnetic field sensor; the sliding table is arranged below the magnetic field sensor, and is used for fixing the steel plate to be detected; the guide rail is connected with the sliding table in a sliding way to realize the movement of the sliding table on the guide rail; the electromagnet is arranged below the sliding table, and is used for magnetizing the steel plate to be detected on the sliding table; the magnetization power supply is connected with the electromagnet, and is used for supplying power to the electromagnet. According to the steel plate defect detector, a high-sensitivity off-diagonal giant-magnetoresistance sensor is adopted, micro defects on the surface or in the steel plate can be captured, and a small hole with a diameter of 0.14mm in the steel plate with a thickness of 0.13mm can be detected.
Description
Technical field
The present invention relates to nondestructive examination field, be specifically related to a kind of steel plate defect defectoscope and detection method thereof.
Background technology
For the measurement of Surface Defects in Steel Plate, the resolution of magnetic sensor and sensitivity are crucial factors.Equipment directly depends on sensitivity and the measurement range of sensor used to the measuring accuracy of defect.And for the measurement of thin strip cold defect, often need to use sensor minimum defect is measured, this just requires sensor can accomplish that miniaturization is to chip-scale.Giant magnetic impedance GMI sensor known can miniaturization to the magnetic field sensor of chip-scale, the highest (the hall device 1-10 of sensitivity
6oe, magnetic resistance 0.1-10
2oe, fluxgate 10
-6-10
2oe, giant magnetic impedance sensor 10
-8oe-10
2oe).And existing defect-detecting equipment is used the sensors such as Hall more, its detection accuracy is often lower, is only generally millimeter magnitude.
The defective product of unavoidable generation in the middle of Plate Production process.Once these defect wares come into the market, can cause huge economic loss.Take thin plate as example, use the thin plate of beverage can, on plate, exist the finished product of defect to be easy to leak under corrosion, this problem Jiang Shi enterprise occurs and face great economic compensation loss.So this respect has strong actual demand.
Summary of the invention
The present invention has overcome the lower deficiency of prior art accuracy of detection, proposes a kind of steel plate defect defectoscope and detection method thereof.The present invention adopts high-sensitive non-diagonal angle giant magnetic impedance (GMI) sensor, can capture surface of steel plate or inner small defect, measures the aperture of diameter 0.14mm on 0.13mm steel plate.
The present invention proposes a kind of steel plate defect defectoscope, comprising:
Magnetic field sensor, it is for measuring the magnetic leakage signal of surface of steel plate;
Sensor stand, it is fixedly connected with described magnetic field sensor, for fixing described magnetic field sensor;
Slide unit, it is arranged on the below of described magnetic field sensor, for fixing steel plate to be measured;
Guide rail, itself and described slide unit are slidably connected, and realize described slide unit and move on described guide rail;
Electromagnet, it is arranged on the below of described slide unit, for magnetizing the steel plate described to be measured on described slide unit;
Excitation supply, it is connected with described electromagnet, for powering to described electromagnet.
Wherein, further comprise:
Signal detector, it is connected with described magnetic field sensor, for gathering the detection signal of described magnetic field sensor and reflecting testing result.
Wherein, described magnetic field sensor can regulate up and down along described sensor stand.
Wherein, described magnetic field sensor is giant magnetic impedance sensor.
Wherein, the resolution of described magnetic field sensor is 5 * 10
-10t.
The detection method that the invention allows for a kind of steel plate defect defectoscope, comprising:
Step 1: steel plate to be measured is entirely arranged on described slide unit;
Step 2: described in gating, excitation supply is powered to described electromagnet, the described steel plate to be measured of described electromagnet magnetization;
Step 3: regulate described sensor stand, make described magnetic field sensor be fixed on the top of described steel plate to be measured;
Step 4: regulate described slide unit to move on described guide rail, described steel plate to be measured slips under described magnetic field sensor, simultaneously described magnetic field sensor detects the magnetic field of described surface of steel plate to be measured;
Step 5: described signal detector gathers the detection signal of described magnetic field sensor, and reflect the testing result of described magnetic field sensor.
Wherein, in described step 2, described electromagnet makes described steel plate magnetic saturation to be measured.
Wherein, in described step 3, the described steel plate lift-off value to be measured of described magnetic field sensor distance is 0.1-3.0mm.
The present invention is based on highly sensitive GMI sensor, greatly improved the ability of the defect that can measure, can measure the aperture of diameter 0.14mm on 0.13mm steel plate.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of steel plate defect defectoscope of the present invention.
Fig. 2 is the process flow diagram of steel plate defect defectoscope detection method of the present invention.
Fig. 3 is the field waveform figure of steel plate defect defectoscope of the present invention while aperture being detected.
Embodiment
In conjunction with following specific embodiments and the drawings, the present invention is described in further detail.Implement process of the present invention, condition, experimental technique etc., except the content of mentioning specially below, be universal knowledege and the common practise of this area, the present invention is not particularly limited content.
As shown in Figure 1,1-magnetic field sensor, 2-sensor stand, 3-slide unit, 4-guide rail, 5-electromagnet, 6-excitation supply, 7-signal detector.
Steel plate defect defectoscope of the present invention, as shown in Figure 1, comprising: magnetic field sensor 1, sensor stand 2, slide unit 3, guide rail 4, electromagnet 5, and excitation supply 6.Magnetic field sensor 1 is for measuring the magnetic leakage signal of surface of steel plate; Sensor stand 2 is fixedly connected with magnetic field sensor 1, for fixed magnetic field sensor 1; Slide unit 3 is arranged on the below of magnetic field sensor 1, for fixing steel plate to be measured; Guide rail 4 is slidably connected with slide unit 3, realizes slide unit 3 and moves on guide rail 4; Electromagnet 5 is arranged on the below of slide unit 3, for magnetizing the steel plate to be measured on slide unit 3; Excitation supply 6 is connected with electromagnet 5, for powering to electromagnet 5.
Steel plate defect defectoscope of the present invention further comprises signal detector 7, and it is connected with magnetic field sensor 1, for gathering the detection signal of magnetic field sensor 1 and reflecting testing result.
In the present invention, magnetic field sensor 1 can regulate up and down along sensor stand 2.Magnetic field sensor 1 is GMI (GMI, giant magnetic impedance) sensor.The resolution of magnetic field sensor 1 is 5 * 10
-10t-8 * 10
-5t.
As shown in Figure 1, steel plate to be measured is tightened the surface being entirely arranged at slide unit 3, and slide unit 3 can horizontal slip on guide rail 4.Excitation supply 6 adds electric current on electromagnet 5, produces a D.C. magnetic field.Steel plate to be measured on the D.C. magnetic field magnetization slide unit 3 that electromagnet 5 produces, makes surface of steel plate defectiveness to be measured and does not have the magnetic field of fault location to produce more obvious difference.
As shown in Figure 2, the detection method of steel plate defect defectoscope of the present invention, comprising:
Step 1: steel plate to be measured is entirely arranged on slide unit 3.
Step 2: gating excitation supply 6 is to electromagnet 5 power supplies, and electromagnet 5 magnetizes steel plate to be measured.Electromagnet 5 makes steel plate magnetic saturation to be measured.
Step 3: regulate sensor stand 2, make magnetic field sensor 1 be fixed on the top of steel plate to be measured.Magnetic field sensor 1 distance steel plate 0.1-3.0mm to be measured.
Step 4: regulate slide unit 3 to move on guide rail 4, steel plate to be measured slips over for 1 time at magnetic field sensor, magnetic field sensor 1 detects the magnetic field of surface of steel plate to be measured simultaneously.
Step 5: signal detector 7 gathers the detection signal of magnetic field sensor 1, and reflect the testing result of magnetic field sensor 1.
In the present embodiment, through on the steel plate to be measured of magnetic field sensor 1, make a call to three equidistant apertures point-blank, wherein, aperture mutual spacing D is 4cm, and the diameter of aperture is 0.14mm, and the thickness of steel plate is 0.13mm.Steel plate to be measured is tightened and is entirely installed to slide unit 3 surfaces.With excitation supply 6, adding electric current to electromagnet 5 (for example, 1.5A), makes electromagnet 5 magnetization through the steel plate to be measured on it.Regulate sensor stand 2, make magnetic field sensor 1 be positioned a certain position, steel plate to be measured top, distance surface of steel plate 1mm to be measured.With 10cm/s degree speed slip slide unit 3, make the aperture on steel plate to be measured pass through successively magnetic field sensor 1 below.From signal detector 7, can obtain the magnetic field of surface of steel plate to be measured, its result as shown in Figure 3.From Fig. 3, every 0.4 second, just there will be an obvious peak value, one has three.Just in time meet D (pitch of holes)=v (plate travelling speed) * t (appear interval time in two peaks), can assert that these three peak values have represented three defects on steel plate.The present invention of this proof can measure the aperture of diameter 0.14mm on 0.13mm steel plate.
Protection content of the present invention is not limited to above embodiment.Do not deviating under the spirit and scope of inventive concept, those skilled in the art can to variation and advantage be all included in the present invention, and take appending claims as protection domain.
Claims (8)
1. a steel plate defect defectoscope, is characterized in that, comprising:
Magnetic field sensor (1), it is for measuring the magnetic leakage signal of surface of steel plate;
Sensor stand (2), it is fixedly connected with described magnetic field sensor (1), for fixing described magnetic field sensor (1);
Slide unit (3), it is arranged on the below of described magnetic field sensor (1), for fixing steel plate to be measured;
Guide rail (4), itself and described slide unit (3) are slidably connected, and realize described slide unit (3) upper mobile at described guide rail (4);
Electromagnet (5), it is arranged on the below of described slide unit (3), for magnetizing the steel plate described to be measured on described slide unit (3);
Excitation supply (6), it is connected with described electromagnet (5), for powering to described electromagnet (5).
2. steel plate defect defectoscope as claimed in claim 1, is characterized in that, further comprises:
Signal detector (7), it is connected with described magnetic field sensor (1), for gathering the detection signal of described magnetic field sensor (1) and reflecting testing result.
3. steel plate defect defectoscope as described in claim 1, is characterized in that, described magnetic field sensor (1) can regulate up and down along described sensor stand (2).
4. steel plate defect defectoscope as described in claim 1, is characterized in that, described magnetic field sensor (1) is giant magnetic impedance sensor.
5. steel plate defect defectoscope as described in claim 1, is characterized in that, the resolution of described magnetic field sensor (1) is 5 * 10
-10t.
6. a detection method for steel plate defect defectoscope, is characterized in that, comprising:
Step 1: steel plate to be measured is entirely arranged on described slide unit (3);
Step 2: excitation supply described in gating (6) is to described electromagnet (5) power supply, and described electromagnet (5) magnetizes described steel plate to be measured;
Step 3: regulate described sensor stand (2), make described magnetic field sensor (1) be fixed on the top of described steel plate to be measured;
Step 4: regulate described slide unit (3) upper mobile at described guide rail (4), described steel plate to be measured slips under described magnetic field sensor (1), and described magnetic field sensor (1) detects the magnetic field of described surface of steel plate to be measured simultaneously;
Step 5: described signal detector (7) gathers the detection signal of described magnetic field sensor (1), and reflect the testing result of described magnetic field sensor (1).
7. the detection method of steel plate defect defectoscope as described in claim 6, is characterized in that, in described step 2, described electromagnet (5) makes described steel plate magnetic saturation to be measured.
8. the detection method of steel plate defect defectoscope as described in claim 6, is characterized in that, in described step 3, the described steel plate lift-off value to be measured of described magnetic field sensor (1) distance is 0.1-3.0mm.
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|---|---|---|---|
| CN201210356031.1A CN103675091A (en) | 2012-09-19 | 2012-09-19 | Steel plate defect detector and detection method for same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981553A (en) * | 2018-05-19 | 2018-12-11 | 芜湖新利德玻璃制品有限公司 | A kind of organic glass crazing detection device |
| CN113504293A (en) * | 2021-06-15 | 2021-10-15 | 浙江工业大学 | Corrosion state magnetic induction automatic scanning device along steel bar trend |
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2012
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Patent Citations (6)
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| JPS61147158A (en) * | 1984-12-21 | 1986-07-04 | Nippon Steel Corp | Defect detecting device for strip |
| JPH01148856U (en) * | 1988-04-05 | 1989-10-16 | ||
| CN1067510A (en) * | 1991-06-04 | 1992-12-30 | 日本钢管株式会社 | Magnetic detection method and device thereof |
| JPH10288603A (en) * | 1997-04-16 | 1998-10-27 | Nkk Corp | Surface flaw detecting method for steel material |
| CN1373852A (en) * | 2000-07-12 | 2002-10-09 | 日本钢管株式会社 | Magnetic leakage flux flow detection method and mfg. method of hot rolled steel plate using same |
| CN101231264A (en) * | 2008-01-31 | 2008-07-30 | 华南理工大学 | Detection method for electromagnetic nondestructive test probe |
Non-Patent Citations (4)
| Title |
|---|
| TEHRANCHI M M ET AL.: "Double core giant magneto-impedance sensors for the inspection of magnetic flux leakage from metal surface cracks", 《SENSORS AND ACTUATORS A: PHYSICAL》, vol. 170, no. 1, 7 June 2011 (2011-06-07) * |
| W. SHARATCHANDRA SINGH ET AL.: "Giant Magneto-Resistive (GMR) Sensors for Non-Destructive Detection of Magnetic Flux Leakage from Sub-Surface Defects in Steels", 《INTERNATIONAL CONFERENCE ON SENSORS AND RELATED NETWORKS (SENNET-2009)》, vol. 1, 31 December 2009 (2009-12-31), pages 09 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981553A (en) * | 2018-05-19 | 2018-12-11 | 芜湖新利德玻璃制品有限公司 | A kind of organic glass crazing detection device |
| CN108981553B (en) * | 2018-05-19 | 2020-12-29 | 芜湖新利德玻璃制品有限公司 | Organic glass silver streak detection device |
| CN113504293A (en) * | 2021-06-15 | 2021-10-15 | 浙江工业大学 | Corrosion state magnetic induction automatic scanning device along steel bar trend |
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