CN102507727A - Detecting and testing platform for metal magnetic memory based on giant magnetic effect and application thereof - Google Patents
Detecting and testing platform for metal magnetic memory based on giant magnetic effect and application thereof Download PDFInfo
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- CN102507727A CN102507727A CN2011103181448A CN201110318144A CN102507727A CN 102507727 A CN102507727 A CN 102507727A CN 2011103181448 A CN2011103181448 A CN 2011103181448A CN 201110318144 A CN201110318144 A CN 201110318144A CN 102507727 A CN102507727 A CN 102507727A
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Abstract
The invention discloses a detecting and testing platform for metal magnetic memory based on giant magnetic effect and an application thereof. The detecting and testing platform is characterized in that the pedestal is provided with a detecting platform, and a to-be-test component is placed on the detecting platform, and a magnetic detecting probe is positioned above the testing component; a positioning device uses a stepping motor as a driving mechanism; a lead screw connected with a rotation shaft of the stepping motor is arranged in an X-direction; the sliding table of the lead screw that is in thread fit with the lead screw is fixedly provided with a support rod in a Y-direction in a cantilever type; the magnetic detecting probe is arranged at the front end of the support rod; and a controller is provided for controlling the stepping motor to perform X-direction positioning control for the sliding table of the lead screw, timely collecting the magnetic memory signals obtained at the corresponding positions of the magnetic probe and obtaining the magnetic memory signals of the to-be-test component corresponding to the X-direction. The detecting and testing platform of the invention can be used for conventional teaching and experiments, and can perform precise detection and accurate positioning of the defects in the one-dimensional direction of frequently-used plate, axis and disk-like structures.
Description
Technical field
The present invention relates to a kind of metal magnetic memory test experience platform, it is a kind of to some the magnetic memory test experience platform and the application thereof of ferromagnetic material member of tabular, axle type and disc-like etc. more specifically to say so.
Background technology
The magnetic property that the utilization of metal magnetic memory detection method is in the ferromagnetic metal in the magnetic field of the earth produces irreversible variation at stress with being out of shape in the concentration zones; Magnetic permeability transition appears at metal and air boundary; Its surface produces stray field, tests this stray field and just can can't harm, confirm exactly area of stress concentration or defective on the ferromagnetic metal component.Need not to add other specific conditions in the testing process; Than magnetic detection, ultrasound detection, EDDY CURRENT and ray detection bigger superiority is arranged; Be at present can Static Detection ferromagnetic component earlier damage the Dynamic Non-Destruction Measurement cutting edge technology; In engineering practice, have broad application prospects, existing practical application on engineering manufacturing industry, petrochemical complex and air equipment especially, and obtain huge economic benefit.
The method of metal magnetic memory detection technology is to be proposed by Russian scholar Dubov in 1997; Mainly be the Grad K that detects the normal component Hp (y) of ferromagnetic component Surface field intensity and calculate Hp (y), the defective of ferromagnetic component judged through Hp (y) and Grad K.Be ZL200820157617, be in the Chinese utility application file of 2009.9.30 in open day in the patent No., disclose a kind of magnetic memory failure detector; Be 200710046922.6 at number of patent application, disclose a kind of detection method of remanent fatigue life of vehicle retired crankshaft in the application for a patent for invention file of open day 2008.3.12.But relevant technical scheme all is to detect to some specific hardwares, and practicality is narrower, and is realizing that the accurate corresponding aspects to detection signal and member defective locations has very big deficiency, is unfavorable for accurate reparation and theoretical analysis to member.
Tabular, the axle type and disc-like be a kind of member commonly used; In conventional teaching and test, all be to use this class A of geometric unitA at present; And be to detect to the defective on the one dimension direction on this class A of geometric unitA; But, also do not have a kind of this type of member commonly used that is exclusively used in to make the equipment that defective accurately detects and locatees on the one dimension direction at present.
Summary of the invention
The present invention is for avoiding above-mentioned existing in prior technology not enough; A kind of metal magnetic memory test experience platform and application thereof based on giant magnetic effect is provided; Be applied to conventional teaching and test, accurately detect and accurate location for the defective on the one dimension direction on tabular, axle type and the disc-like member commonly used.
The present invention adopts following technical scheme for the technical solution problem:
The design feature that the present invention is based on the metal magnetic memory test experience platform of giant magnetic effect is to be provided with respectively on the base:
One monitor station, test specimen are placed on the monitor station, and the magnetic detection probe is positioned at the top of said test specimen;
One location device; Be to be driving mechanism with the stepper motor; The leading screw that is connected with the rotating shaft of stepper motor along " X " to setting, with leading screw slide unit that said threads of lead screw cooperates on, edge " Y " fixedly installs support bar to being cantilevered; Said magnetic detection probe is arranged on the front end of said support bar, the magnetic detection probe under the step motor drive with the screw mandrel slide unit above test specimen along " X " to moving;
One controller, the control step motor carries out " X " to positioning control to the leading screw slide unit, gathers the magnetic memory signal that the magnetic detection probe is obtained on correspondence position in good time, obtains test specimen and upwards is corresponding magnetic memory signal with the position at " X ".
The design feature that the present invention is based on the metal magnetic memory test experience platform of giant magnetic effect also is:
Said magnetic detection probe adopts the SAS series sensor based on the Spin Valve giant magnetic effect.
In the periphery of said monitor station the electromagnetic screen net is set, said base and monitor station are to be material with the nonmagnetic substance, and said controller is arranged in the electromagnetic screen protection network.
Said controller has:
One signal conditioning circuit is made up of an active low-pass filter and a voltage protection circuit;
One D/A converting circuit is made up of the ADS8364 analog-digital chip;
One processor is made up of the DSP2407 processor chips;
One storer is made up of the IS61LV6416 chip;
Said magnetic detection probe output signal is through signal conditioning circuit filtering output detection signal x (t), and said detection signal x (t) is through D/A converting circuit output digital detection signal x (n); Parallel data mouth by said DSP2407 processor chips reads digital detection signal x (n), controls the storage to digital detection signal x (n) through the DS mouth of DSP2407 chip; Said DSP2407 processor chips are through the service frequency signal of T3PWM mouth output ADS8364 analog-digital chip; PWM1, PWM2, PWM3, PWM4 mouth output pulse control signal through the DSP2407 process chip; Said pulse control signal is through the controllor for step-by-step motor power amplification; Output step motor control signal; Serial port module through the DSP2407 processor chips is communicated by letter with said intelligent display, and communication mode adopts RS232 or RS485.
The method of ferromagnetic component defect location of the present invention is characterized in that:
The initial position of magnetic detection probe to lying in a horizontal plane on the monitor station, is write down in test specimen edge " X ";
Start stepper motor, making said stepper motor obtain frequency is f
2Pulse control signal, through stepper motor drive the magnetic detection probe along " X " to test specimen is detected;
When the magnetic detection probe detected defective locations, the umber of pulse m that the record stepper motor obtains obtained the displacement s of magnetic detection probe with respect to initial position according to formula (2):
Wherein: Δ s is the pitch of leading screw (11), and m is a umber of pulse, and φ is the step angle of stepper motor.
Compared with present technology, beneficial effect of the present invention is embodied in:
1, experimental provision of the present invention drives moving of detection probe through stepper motor, is easy to the accurate control to detection probe displacement; Frequency of operation and motor operation controlled frequency signal through processor chips output digital to analog converter are easy to realize detecting the particular location of tested member and obtain signal and carry out correspondence.
2, spin valve giant magnetoresistance antiatherosclerotic effect sensor is a kind of novel sensor; Has very strong susceptibility for the subtle change in the magnetic field; High 1～2 one magnitude of magnetic resistance sensor that its detection sensitivity is used than present routine, and in its working range, have good linearty and temperature stability.The present invention adopts spin valve giant magnetoresistance antiatherosclerotic effect sensor can significantly improve the degree of accuracy that the magnetic memory detects.
3, the present invention is through adopting radome to protect to electric appliance unit, and signal transmssion line adopts shielded signal wire, around experiment porch, the Electromagnetic anti-skid net is installed, and can effectively reduce interference, improves and detects degree of accuracy.
4, structure setting of the present invention and circuit are formed comparatively simply, are easy to realize; Use the DSP2407 processor chips, improved the speed that the data of gathering are carried out computing and processing.
5, the present invention adopts platform structure; Be positioned on the worktable; Import control and output demonstration testing result through intelligent display; Conveniently be used for conventional demonstration and test,, obtain good teaching effective and test objective through the defective on the one dimension direction on tabular, axle type and the disc-like member commonly used accurately being detected and accurate location.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is control circuit schematic diagram among the present invention;
Fig. 3 is a workflow diagram of the present invention;
Fig. 4 is giant magnetic effect sensor probe circuit theory diagrams of the present invention;
Label among the figure: 1 intelligent display; 2 controllers; 3 bases; 4 monitor stations; 5 magnetic detection probe; 6 clamp nuts; 7 nuts; 8 test specimens; 9 radomes; 10 stepper motors; 11 leading screws; 12 leading screw slide units; 13 support bars; 14 shielded signal wire.
Embodiment
Metal magnetic memory test experience platform based on giant magnetic effect in the present embodiment is to be provided with respectively on the base 3:
One monitor station 4, test specimen 8 are placed on the monitor station 4, and magnetic detection probe 5 is positioned at the top of test specimen 8;
One location device; Be to be driving mechanism with stepper motor 10; The leading screw that is connected with the rotating shaft of stepper motor 10 11 along " X " to setting, with the leading screw slide unit 12 of leading screw 11 threaded engagement on, fixedly install support bar 13 along " Y " to being cantilevered; Magnetic detection probe 5 is arranged on the front end of support bar 13, stepper motor 10 drive magnetic detection probe 5 down with screw mandrel slide unit 12 above test specimen along " X " to mobile;
One controller, 10 pairs of leading screw slide units of control step motor 12 carry out " X " to positioning control, gather the magnetic memory signal that magnetic detection probe 5 is obtained on correspondence position in good time, obtain test specimen 8 and upwards are corresponding magnetic memory signal with the position at " X ".
In the practical implementation, the corresponding structure setting also comprises:
SAS series sensor shown in Figure 4, that magnetic detection probe 5 adopts based on the Spin Valve giant magnetic effect detects the magnetic memory signal method phase component that is placed on test specimen 8 on the monitor station 4 by magnetic detection probe 5.Sensor is exported a pair of differential voltage signal; Through differential amplifier AD1 it being carried out difference amplifies; One 100 Europe resistance R 5 of series connection and a precision resistor R6 between 1 pin of differential amplifier AD1 and 8 pin, R5 is used for preventing that potentiometer R6 resistance adjustment is low excessively, causes output voltage excessive.Adopt shielded signal wire 14 to be connected between magnetic detection probe 5 and the controller 2.
In the periphery of base 3 electromagnetic screen net 9 is set, base 3 is to be material with the nonmagnetic substance with monitor station 4, itself magnetic memory testing result is exerted an influence to prevent base 3 and monitor station 4; All use the radome protection in controller 2, stepper motor 10 outsides, electromagnetic screen net 9 is housed, reduce magnetic detection probe 5 and receive the interference in peripheral magnetic field in the rear end and the both sides of base 3.
Shown in Figure 2, controller 2 has a signal conditioning circuit, is made up of an active low-pass filter and a voltage protection circuit; One D/A converting circuit is made up of the ADS8364 analog-digital chip; One processor is made up of the DSP2407 processor chips; One storer is made up of the IS61LV6416 chip;
In practical implementation, also include feed circuit in the controller, feed circuit adopt the power supply of 220V alternating voltage, through filtering, transformation, rectification, voltage stabilizing obtain+/-5.0V, 3.3V, 12.0V, 24.0V DC voltage.5.0V of+/-and 3.3V supply with the integrated package in the data acquisition unit, and 12.0V supplies with intelligent display 1, and 24.0V supplies with the stepper motor 9 in the locating device.
Be provided with in the processor that 64 rank sef-adapting filters based on LMS carry out digital filtering algorithm and to the computing method of change rate signal K (n) value obtained, wherein digital filtering algorithm is suc as formula (3), (4) and (5):
For (n=0; N＜N; N++)
(3); Ask output
E (n)=d (n)-y (n) (4); Ask error
For (n=0; N＜N; N++) w (n+1)=w (n)+u*e (n) * x (n) (5); Upgrade filter factor
Wherein: N=64, n are independent variable, and x (n) is the input vector of sef-adapting filter, and y (n) is the output vector of sef-adapting filter, the digital signal of d (n) for gathering, and e (n) is an error, and w (k) is the filter factor value, and u is a converging factor.
Rate of change K (n) value calculating method of signal waveform is suc as formula (6):
Wherein Δ L is the horizontal range that leading screw slide unit (11) can move in the dac cycle, the signal of twice collection before and after x (n) and x (n+1) are respectively.At last the data bus of the data after the computing through DSP2407 stored into K (n) and x (n) in the storer, and filtered digital data transmission is shown in intelligent display 1 by the SCI module.
Experiment porch carries out the method for ferromagnetic component defect location and is in the present embodiment:
At first with test specimen 8 along " X " to lying in a horizontal plane on the monitor station 4 initial position of record magnetic detection probe 5;
Start experiment porch; By workflow diagram operation shown in Figure 3; And processor is exported the operation pulse control signal of stepper motor synchronously; The winding that process is isolated, power amplification is input to stepper motor 10 afterwards, drive stepping motor 10 runnings drive magnetic detection probe 5 edges " X " to test specimen 8 is detected through stepper motor;
When magnetic detection probe 5 detected defective locations, the umber of pulse m that record stepper motor 10 obtains obtained the displacement s of magnetic detection probe 5 with respect to initial position according to formula (7):
Wherein: Δ s is the pitch of leading screw 11, and m is a umber of pulse, and φ is the step angle of stepper motor.
In testing process, can also detect the multiple spot defective of test specimen in " X " direction through processor for recording magnetic detection probe 5.
Claims (5)
1. metal magnetic memory test experience platform based on giant magnetic effect is characterized in that being provided with respectively on the base (3):
One monitor station (4), test specimen (8) are placed on the monitor station (4), and magnetic detection probe (5) is positioned at the top of said test specimen (8);
One location device; Be to be driving mechanism with stepper motor (10); The leading screw (11) that is connected with the rotating shaft of stepper motor (10) along " X " to setting, with the leading screw slide unit (12) of said leading screw (11) threaded engagement on, fixedly install support bar (13) along " Y " to being cantilevered; Said magnetic detection probe (5) is arranged on the front end of said support bar (13), stepper motor (10) drive magnetic detection probe (5) down with screw mandrel slide unit (12) above test specimen along " X " to mobile;
One controller; Control step motor (10) carries out " X " to positioning control to leading screw slide unit (12); Gather the magnetic memory signal that magnetic detection probe (5) is obtained in good time on correspondence position, obtain test specimen (8) and upwards be corresponding magnetic memory signal with the position at " X ".
2. the metal magnetic memory test experience platform based on giant magnetic effect according to claim 1 is characterized in that said magnetic detection probe (5) adopts the SAS series sensor based on the Spin Valve giant magnetic effect.
3. the metal magnetic memory test experience platform based on giant magnetic effect according to claim 1; It is characterized in that electromagnetic screen net (9) being set in the periphery of said monitor station (4); Said base (3) and monitor station (4) are to be material with the nonmagnetic substance, and said controller is arranged in the electromagnetic screen protection network.
4. the metal magnetic memory test experience platform based on giant magnetic effect according to claim 1 is characterized in that said controller (2) has:
One signal conditioning circuit is made up of an active low-pass filter and a voltage protection circuit;
One D/A converting circuit is made up of the ADS8364 analog-digital chip;
One processor is made up of the DSP2407 processor chips;
One storer is made up of the IS61LV6416 chip;
Said magnetic detection probe (5) output signal is through signal conditioning circuit filtering output detection signal x (t), and said detection signal x (t) is through D/A converting circuit output digital detection signal x (n); Parallel data mouth by said DSP2407 processor chips reads digital detection signal x (n), controls the storage to digital detection signal x (n) through the DS mouth of DSP2407 chip; Said DSP2407 processor chips are through the service frequency signal of T3PWM mouth output ADS8364 analog-digital chip; PWM1, PWM2, PWM3, PWM4 mouth output pulse control signal through the DSP2407 process chip; Said pulse control signal is through the controllor for step-by-step motor power amplification; Output step motor control signal; Serial port module through the DSP2407 processor chips is communicated by letter with said intelligent display (1), and communication mode adopts RS232 or RS485.
5. method of utilizing the said experiment porch of claim 1 to carry out the ferromagnetic component defect location is characterized in that:
The initial position of magnetic detection probe (5) to lying in a horizontal plane on the monitor station (4), is write down in test specimen (8) edge " X ";
Start stepper motor (10), making said stepper motor (10) obtain frequency is f
2Pulse control signal, through stepper motor drive magnetic detection probe (5) along " X " to test specimen (8) is detected;
When magnetic detection probe (5) when detecting defective locations, the umber of pulse m that record stepper motor (10) obtains obtains the displacement s of magnetic detection probe (5) with respect to initial position according to formula (1):
Wherein: Δ s is the pitch of leading screw (11), and m is a umber of pulse, and φ is the step angle of stepper motor.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730142A (en) * | 2014-11-20 | 2015-06-24 | 北京航空航天大学 | Planar magnetic field scanning and imaging system based on Hall sensor |
| CN105334104A (en) * | 2015-09-23 | 2016-02-17 | 中国特种设备检测研究院 | Magnetic signal detection apparatus |
| CN106018543A (en) * | 2016-05-16 | 2016-10-12 | 北京理工大学 | Bolt connecting part damage in-situ monitoring device based on magnetic memory effect |
| CN106053592A (en) * | 2016-06-13 | 2016-10-26 | 河海大学 | Real bridge weld joint scanner and real bridge weld joint scanning method |
| CN107064290A (en) * | 2016-12-30 | 2017-08-18 | 北京工业大学 | Steel oil pipeline defects detection simulating lab test system based on amount magnetic technology |
| CN107755654A (en) * | 2016-08-23 | 2018-03-06 | 上海宝信软件股份有限公司 | Automatic measurement and record slab electromagnetic agitation magnetic field intensity apparatus and method |
| CN108956756A (en) * | 2018-08-14 | 2018-12-07 | 浙江科技学院 | A kind of highly sensitive ferromagnetic material lossless detection method and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2682415Y (en) * | 2004-02-19 | 2005-03-02 | 中国石油天然气集团公司 | Metal magnetic memory intelligent detector |
| CN201707320U (en) * | 2010-06-10 | 2011-01-12 | 南昌航空大学 | Semiautomatic scanning control device applicable to complex profile eddy current detection |
| CN202351212U (en) * | 2011-10-19 | 2012-07-25 | 合肥工业大学 | Metal magnetic memory detection experimental platform based on giant magneto-resistance effect |
-
2011
- 2011-10-19 CN CN2011103181448A patent/CN102507727A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2682415Y (en) * | 2004-02-19 | 2005-03-02 | 中国石油天然气集团公司 | Metal magnetic memory intelligent detector |
| CN201707320U (en) * | 2010-06-10 | 2011-01-12 | 南昌航空大学 | Semiautomatic scanning control device applicable to complex profile eddy current detection |
| CN202351212U (en) * | 2011-10-19 | 2012-07-25 | 合肥工业大学 | Metal magnetic memory detection experimental platform based on giant magneto-resistance effect |
Non-Patent Citations (8)
| Title |
|---|
| SHI C L ET AL.: "Metal magnetic memory effect caused by static tension load in a case-hardened steel", 《JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS》 * |
| 任吉林 等: "一种磁记忆检测定量分析的新方法", 《仪器仪表学报》 * |
| 任吉林 等: "航空铁磁材料磁记忆检测新方法", 《航空学报》 * |
| 康伟芳 等: "用自旋阀巨磁电阻传感器测量地磁场", 《武汉理工大学学报·信息与管理工程版》 * |
| 张丽秀 等: "PLC 位控单元在精密磨削控制中的应用", 《沈阳建筑工程学院学报》 * |
| 杜磊 等: "金属磁记忆在应力测试中的应用", 《兵工自动化》 * |
| 钟民先 等: "电动压缩机智能控制***", 《微电机（伺服技术）》 * |
| 高玄怡 等: "基于嵌入式结构的便携式磁记忆检测仪", 《仪表技术与传感器》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730142A (en) * | 2014-11-20 | 2015-06-24 | 北京航空航天大学 | Planar magnetic field scanning and imaging system based on Hall sensor |
| CN104730142B (en) * | 2014-11-20 | 2017-11-17 | 北京航空航天大学 | A kind of flat magnetic field scanning imaging system based on Hall sensor |
| CN105334104A (en) * | 2015-09-23 | 2016-02-17 | 中国特种设备检测研究院 | Magnetic signal detection apparatus |
| CN106018543A (en) * | 2016-05-16 | 2016-10-12 | 北京理工大学 | Bolt connecting part damage in-situ monitoring device based on magnetic memory effect |
| CN106053592A (en) * | 2016-06-13 | 2016-10-26 | 河海大学 | Real bridge weld joint scanner and real bridge weld joint scanning method |
| CN106053592B (en) * | 2016-06-13 | 2018-04-20 | 河海大学 | Real bridge welding seam scanner and its scan method |
| CN107755654A (en) * | 2016-08-23 | 2018-03-06 | 上海宝信软件股份有限公司 | Automatic measurement and record slab electromagnetic agitation magnetic field intensity apparatus and method |
| CN107064290A (en) * | 2016-12-30 | 2017-08-18 | 北京工业大学 | Steel oil pipeline defects detection simulating lab test system based on amount magnetic technology |
| CN108956756A (en) * | 2018-08-14 | 2018-12-07 | 浙江科技学院 | A kind of highly sensitive ferromagnetic material lossless detection method and system |
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Application publication date: 20120620 |