CN104458894A - Detecting method and detecting device for T-shaped tail slot of magnetic poles and magnet yokes of high-speed hydrogenerator rotor - Google Patents
Detecting method and detecting device for T-shaped tail slot of magnetic poles and magnet yokes of high-speed hydrogenerator rotor Download PDFInfo
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- CN104458894A CN104458894A CN201410741134.9A CN201410741134A CN104458894A CN 104458894 A CN104458894 A CN 104458894A CN 201410741134 A CN201410741134 A CN 201410741134A CN 104458894 A CN104458894 A CN 104458894A
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Abstract
The invention discloses a detecting method and a detecting device for a T-shaped tail slot of magnetic poles and magnet yokes of a high-speed hydrogenerator rotor. The detecting method comprises the following steps: blocking a magnetic line of force on the surface of the T-shaped tail slot when cracks exist by virtue of the T-shaped tail slot of magnetic poles and magnet yokes of a magnet, thus distorting magnetic flux in a magnetic path to result in the escaping of part of the magnetic flux out of the surface of the T-shaped tail slot and forming of magnetic leakage filed in a space; obtaining a magnetic flux leakage signal by virtue of a magnetic sensitive element, and detecting the magnetic flux leakage signal through a magnetic flux leakage detector. The detecting device comprises a crack probe detecting device, a guide bracket and a magnetic flux leakage detector, wherein the crack probe detecting device is arranged on the guide bracket, and the crack probe detecting device is connected to the magnetic flux leakage detector through a signal transmission line; the crack probe detecting device comprises an inverted U-shaped magnet A and a three-dimensional hall probe fixed on a guide bracket by virtue of an elastic part, wherein the three-dimensional hall probe is connected to the signal transmission line by virtue of a signal terminal through a signal amplifying and digital-to-analog conversion circuit.
Description
Technical field
The present invention relates to a kind of detection method and device thereof of T stern notch, particularly a kind of detection method of high speed magnet pole of rotor of hydraulic generator yoke T stern notch and device thereof.
Background technology
T stern notch is a kind of draw bail of hydrogenerator magnetic level and yoke, form by 4mm thickness silicon steel lamination layer is folded, larger alterante stress is born in shutdown process, particularly its inside lock position stress value is maximum, easy germinating fatigue crack, therefore the accident changing whole generator magnetic level yoke once occurred, and directly, indirect loss is huge.For ensureing that high rotating speed (500r/min) water-wheel generator magnetic pole connects the safety of T stern notch in long term frequent start and stop operating mode with yoke, need to carry out crack detection to the T stern notch of magnetic pole yoke.And the conventional lossless detection method detecting crackle has EDDY CURRENT (ET), Magnetic testing (MT) and Liquid penetrant testing (PT), three kinds of methods all can detect the crackle of imporosity surface of the work.During conventional EDDY CURRENT crackle, although do not use detection liquid, noresidue problem, but because stacked siliconized plate produces strong " boundary effect " eddy current signal, crackle eddy current signal is submerged in the interference of background eddy current, and signal to noise ratio (S/N ratio) is extremely low, cannot detect crackle.Conventional Magnetic testing, then must use water base or oil base magnetic flaw detection ink, in testing process, magnetic flaw detection ink can enter lamination gap, and cannot clear out after detecting, and the insulation not only reducing magnetic level yoke also will pollute.During conventional Liquid penetrant testing crackle, except cannot solve detect after except bleeding agent removing problem, remain bleeding back of bleeding agent in lamination the gap in and also greatly will reduce detection sensitivity, cause the undetected of crackle, cannot apply equally.
Summary of the invention
The object of the invention is to, a kind of lossless detection method and device thereof of high speed magnet pole of rotor of hydraulic generator yoke T stern notch is provided.The present invention not only achieves and carries out pollution-free, noresidue to magnetic pole yoke lamination T stern notch and do not reduce the requirement of Insulation monitoring, and highly sensitive, accuracy good, meet the electric and metallic airbag regulation that Large Hydroelectric Set is strict completely, improve generating set reliability of operation, is the important guarantee of hydrogenerator security of operation.
Technical scheme of the present invention: the detection method of high speed magnet pole of rotor of hydraulic generator yoke T stern notch, it is characterized in that: by magnet magnetization magnetic pole yoke T stern notch, the magnetic line of force by T stern notch surface has been blocked when there is crackle, magnetic flux in magnetic circuit is distorted, cause part magnetic flux effusion T stern notch surface, form stray field in space, utilize magneto sensor to obtain magnetic leakage signal, and by Magnetic Flux Leakage Testing Instrument, magnetic leakage signal is detected.
In the detection method of aforesaid high speed magnet pole of rotor of hydraulic generator yoke T stern notch, by probe guiding trestle, probe is delivered to detection position, and utilize constant force structure to make probe be close to subject face, the magnetization of П shape magnet A detects the ferromagnetism lamination at position, produce induced field, when the magnetic line of force excited runs into crackle on the tested position of T stern notch, stray field will be formed in cracks, stray field is received by the magneto sensor in popping one's head in and is converted into digital signal, by Magnetic Flux Leakage Testing Instrument, signal transacting and display are carried out to crack stray field, thus judge whether tested T stern notch exists crackle.
In the detection method of aforesaid high speed magnet pole of rotor of hydraulic generator yoke T stern notch, the method whether tested T stern notch of described judgement exists crackle is, three-dimensional hall probe is placed in by guiding trestle and detects position, Hall element Z in three-dimensional hall probe is parallel with magnetic pole rim lamination plane, makes X, Y, Z tri-equal zero setting of direction signal of three-dimensional hall probe; When X-direction signal is more than or equal to 25:1 with the ratio of Z-direction signal intensity or when Y-direction signal is more than or equal to 50:1 with the ratio of Z-direction signal intensity, then judge that the laminate surface of detection site exists abnormal.
In the detection method of aforesaid high speed magnet pole of rotor of hydraulic generator yoke T stern notch, then by magnetic powder detection method, the position that there is anomalous field is rechecked; Magnetic powder detection method is carried out in the steps below:
Snag clearly abnormal signal portion faces in Magnetic testi;
Open Magnetic testing installation's power source;
The probe of Magnetic testing device is placed in abnormal portion faces;
Weak vibrations magnetic flaw detection ink watering can, evenly sprays magnetic flaw detection ink at abnormal portion faces;
Be applied to the magnetic on surface by stray field absorption, under the ultraviolet illumination of 365nm wavelength, form visual visible magnetic trace, thus determine that detected magnetic pole yoke T stern notch exists crackle.
In the detection method of aforesaid high speed magnet pole of rotor of hydraulic generator yoke T stern notch, described magnetic flaw detection ink is mixed by the raw material of following weight portion: 71-73 part ethanol, 16-18 part ethyl acetate, 2.5-3.5 part methenyl choloride, 1.5-2.5 part acetone, 0.15-0.25 part MPI fluorescent magnetic particles; MPI fluorescent magnetic particles granularity is 350 orders.
Realize the pick-up unit of aforesaid high speed magnet pole of rotor of hydraulic generator yoke T stern notch detection method, it is characterized in that: comprise crackle probe detector, guiding trestle and Magnetic Flux Leakage Testing Instrument, crackle probe detector is arranged on guiding trestle, and crackle probe detector is connected with Magnetic Flux Leakage Testing Instrument by signal transmssion line; Described crackle probe detector comprises and is fixed on П shape magnet A on guiding trestle and three-dimensional hall probe through elastic component, three-dimensional hall probe is arranged between opening part the two poles of the earth of П shape magnet A, and extending out to forward the top of П shape magnet A bipod inclined-plane extension, described three-dimensional hall probe is amplified by signal and D/A converting circuit is connected with signal transmssion line through signal terminal.
In the pick-up unit of aforesaid high speed magnet pole of rotor of hydraulic generator yoke T stern notch, described three-dimensional hall probe is three-dimensional magnetosensitive Hall element array, be made up of the orthogonal sheet Hall element of X, Y, Z tri-, three Hall element landing tees are put, and can measure the magnetic field size and Orientation on XYZ tri-directions simultaneously.
In the pick-up unit of aforesaid high speed magnet pole of rotor of hydraulic generator yoke T stern notch, described guiding trestle is provided with handle, for mobile guide support.
In the pick-up unit of aforesaid high speed magnet pole of rotor of hydraulic generator yoke T stern notch, described П shape magnet A is neodymium nickel cobalt type permanent magnet, and for magnetizing tested position, opening the two poles of the earth pin inclined plane shape at 45 °, fits with T stern notch inside lock two sides respectively
In the pick-up unit of aforesaid high speed magnet pole of rotor of hydraulic generator yoke T stern notch, also comprise crackle Magnetic testing device; Crackle Magnetic testing device comprises П shape magnet B, is neodymium nickel cobalt type permanent magnet, and for magnetizing tested position, opening the two poles of the earth pin inclined plane shape at 45 °, fits with T stern notch inside lock two sides respectively;
Centre wavelength is the miniature LED type uviol lamp of 365nm, is fixed between П shape magnet B opening part two-stage, for fluorescence excitation magnetic;
Power supply terminal, is arranged in П shape magnet B, connects miniature LED type uviol lamp;
The direct supply of belt switch and shutoff display, internal battery, for UV-lamp provides power supply;
Anti-flammability power lead, for connecting direct supply and power supply terminal.
Compared with prior art, the present invention is by detecting the T stern notch crackle of high speed water turbine generator magnetic pole yoke, and Timeliness coverage workpiece is in operation the dangerous crackle produced, and avoids its expansion cracking, threatens the safe operation of unit.The present invention not only achieves and carries out pollution-free, noresidue to magnetic pole yoke lamination T stern notch and do not reduce the requirement of Insulation monitoring, and highly sensitive, accuracy good, meet the electric and metallic airbag regulation that Large Hydroelectric Set is strict completely, improve generating set reliability of operation, is the important guarantee of hydrogenerator security of operation.
The present invention adopts the special crackle magnetic leakage detecting probe of T stern notch, integrates magnetization and three-dimensional magnetic field measuring ability, can to magnetic pole rim lamination crackle carry out sensitive, detect fast, and the electric property of workpiece to be had no effect.
By the aspect ratio pair of XYZ tri-direction crackle magnetic leakage signal, achieve the discriminating of Signal of Cracks and pole sheet gap signal, solve the difficult problem that conventional leakage field method cannot detect lamination crackle.
For ensure position in magnetic leakage probe testing process accurately and stable, devise special probe bracket to and guide piece, this support also supports that the quick-replaceable of popping one's head in detects to take into account MPI fluorescent magnetic particles.
T stern notch special crackle MPI fluorescent magnetic particles detection probe, and the noresidue MPI fluorescent magnetic particles formula not reducing Workpiece insulating energy, and formulated corresponding characterization processes, realize the reinspection of crackle, improve the high reliability of crack detection.
The present invention can detect the T stern notch crackle of high speed water turbine generator magnetic pole yoke, and Timeliness coverage workpiece is in operation the dangerous crackle produced, and to avoid its expansion cracking, threatens the safe operation of unit.The present invention can judge existence and the equivalent depth of crackle in T stern notch accurately and reliably.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of crackle probe detector;
Fig. 3 is the structural representation of three-dimensional hall probe;
Fig. 4 is crackle Magnetic Flux Leakage Inspecting view;
Fig. 5 is the structural representation of crackle Magnetic testing device.
Being labeled as in accompanying drawing: 1-Magnetic Flux Leakage Testing Instrument, 2-signal transmssion line, 3-handle, 4-guiding trestle, 5-crackle probe detector, 6-elastic component, 7-magnetic pole yoke, 8-T stern notch, 9-П shape magnet A, 10-signal terminal, 11-signal amplifies and D/A converting circuit, the three-dimensional hall probe of 12-, 13-П shape magnet B, 14-power supply terminal, the miniature LED type uviol lamp of 15-, 16-anti-flammability power lead, 17-direct supply.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated, but not as the foundation limited the present invention.
Embodiment.The detection method of high speed magnet pole of rotor of hydraulic generator yoke T stern notch, by probe guiding trestle, probe is delivered to detection position, and utilize constant force structure to make probe be close to subject face, the magnetization of П shape magnet A detects the ferromagnetism lamination at position, produce induced field, when the magnetic line of force excited runs into crackle on the tested position of T stern notch, stray field will be formed in cracks, stray field is received by the magneto sensor in popping one's head in and is converted into digital signal, by Magnetic Flux Leakage Testing Instrument, signal transacting and display are carried out to crack stray field, thus judge whether tested T stern notch exists crackle.
The method whether tested T stern notch of described judgement exists crackle is, as shown in Figure 4, be placed in by guiding trestle by three-dimensional hall probe and detect position, the Hall element Z in three-dimensional hall probe is parallel with magnetic pole rim lamination plane; Make X, Y, Z tri-equal zero setting of direction signal of three-dimensional hall probe; When X-direction signal is more than or equal to 25:1 with the ratio of Z-direction signal intensity or when Y-direction signal is more than or equal to 50:1 with the ratio of Z-direction signal intensity, then judge that the laminate surface of detection site exists abnormal.
By magnetic powder detection method, the position that there is anomalous field is rechecked again; Magnetic powder detection method is carried out in the steps below:
Snag clearly abnormal signal portion faces in Magnetic testi;
Open Magnetic testing installation's power source;
The probe of Magnetic testing device is placed in abnormal portion faces;
Weak vibrations magnetic flaw detection ink watering can, evenly sprays magnetic flaw detection ink at abnormal portion faces;
Be applied to the magnetic on surface by stray field absorption, under the ultraviolet illumination of 365nm wavelength, form visual visible magnetic trace, thus determine that detected magnetic pole yoke T stern notch exists crackle.
Described magnetic flaw detection ink is mixed by the raw material of following weight portion: 71-73 part ethanol, 16-18 part ethyl acetate, 2.5-3.5 part methenyl choloride, 1.5-2.5 part acetone, 0.15-0.25 part MPI fluorescent magnetic particles; MPI fluorescent magnetic particles granularity is 350 orders.Magnetic flaw detection ink boiling point, lower than 80 DEG C, once applying, will volatilize rapidly under normal temperature at short notice, and no liquid remains.Use procedure is as follows: this magnetic flaw detection ink should configure in 5 minutes before use, and load seal-off pressure watering can, 1mm wire casing verifies sensitivity to crackle test plate (panel), and the magnetic flaw detection ink term of validity must not more than 30 minutes.Under UV-lamp, observe to be detected whether there is crackle magnetic trace (adsorbed the crackle of MPI fluorescent magnetic particles, under the irradiation of 365nm length ultraviolet line, bright yellow-green fluorescence will have been shown).Reasonable, described magnetic flaw detection ink is mixed by the raw material of following weight portion: 72.8 parts of ethanol, 17 parts of ethyl acetate, 3 parts of methenyl cholorides, 2 parts of acetone, 0.2 part of MPI fluorescent magnetic particles.
Adopt magnetic pole rim lamination crackle contrast test plate (panel)
Test plate (panel) material: siliconized plate; Test plate (panel) thickness: 5mm
Test plate (panel) size: 240mm × 225mm
Artificial defect: wire casing (simulating crack); Job operation: electrosparking
#1 test block: wire casing size: dark 1.0mm; Long 4mm; A/F 0.25mm
#2 test block: wire casing size: dark 2.0mm; Long 4mm; A/F 0.25mm
#3 test block: wire casing size: dark 3.0mm; Long 4mm; A/F 0.25mm
The use of crackle contrast test plate (panel):
With the wire casing simulation actual crack on test plate (panel), as pick-up unit measures the signal intensity of actual crack, consistent with certain degree of depth wire casing signal on test plate (panel), then using this wire casing degree of depth as the equivalent depth of actual crack.
Before Magnetic Flux Leakage Inspecting, test plate (panel) carries out sensitivity check and demarcation to leakage magnetic detection device;
After crack detection, the Signal of Cracks found in the detection is compared measurement, to determine the equivalent depth of crackle.
In testing process, can at any time leakage field and magnetic particle testing system sensitivity be verified and be checked.
The grade estimation of crackle and process:
Evaluation:
When crackle equivalent depth is 1mm ~ 2mm, be decided to be I level;
When crackle equivalent depth is 2mm ~ 3mm, be decided to be II level;
When crackle equivalent depth is greater than 3mm, be decided to be III level;
Process:
I level defect, polishing is eliminated;
II level defect, polishing is eliminated and is repaiied at this place as C type;
III level defect, changes this lamination or implements to mend by replacing a damaged part to this crackle.
After all defect process, reply mend re-starts detection, can come into operation after qualified.
Realize the pick-up unit of above-mentioned high speed magnet pole of rotor of hydraulic generator yoke T stern notch detection method, form as Figure 1-5, comprise crackle probe detector 5, guiding trestle 4 and Magnetic Flux Leakage Testing Instrument 1, crackle probe detector 5 is arranged on guiding trestle 4, and crackle probe detector 5 is connected with Magnetic Flux Leakage Testing Instrument 1 by signal transmssion line 2; Described crackle probe detector 5 comprises and is fixed on П shape magnet A 9 on guiding trestle 4 and three-dimensional hall probe 12 through elastic component 6, three-dimensional hall probe 12 is arranged between opening part the two poles of the earth of П shape magnet A 9, and extending out to forward the top of П shape magnet A 9 bipod inclined-plane extension, described three-dimensional hall probe 12 is amplified by signal and D/A converting circuit 11 is connected with signal transmssion line 2 through signal terminal 10.Described three-dimensional hall probe 12 can magnetize tested position, detects the magnetic field intensity in XYZ tri-dimensions simultaneously; Signal amplifies and three groups of signal shapings that three-dimensional hall probe 12 produces can synchronously be changed and amplify by D/A converting circuit 11, is connected, detection signal is transferred to Magnetic Flux Leakage Testing Instrument main frame by signal terminal with signal transmssion line.Crackle probe detector can be fixed on and detect position by guiding trestle, and applies constant force support to crackle probe detector, and avoiding pops one's head in during mobility detect produces excessive beating and swing.
Described three-dimensional hall probe 12 is three-dimensional magnetosensitive Hall element array, and be made up of the orthogonal sheet Hall element of X, Y, Z tri-, three Hall element landing tees are put, and can measure the magnetic field size and Orientation on XYZ tri-directions simultaneously.
Described guiding trestle 4 is provided with handle 3, for mobile guide support.
Described П shape magnet A 9 is neodymium nickel cobalt type permanent magnet, and for magnetizing tested position, opening the two poles of the earth pin inclined plane shape at 45 °, fits with T stern notch inside lock two sides respectively
Also comprise crackle Magnetic testing device; Crackle Magnetic testing device comprises П shape magnet B 13, is neodymium nickel cobalt type permanent magnet, and for magnetizing tested position, opening the two poles of the earth pin inclined plane shape at 45 °, fits with T stern notch inside lock two sides respectively;
Centre wavelength is the miniature LED type uviol lamp 15 of 365nm, is fixed between П shape magnet B 13 opening part two-stage, for fluorescence excitation magnetic;
Power supply terminal 14, is arranged in П shape magnet B 13, connects miniature LED type uviol lamp 15;
The direct supply 17 of belt switch and shutoff display, internal battery, for miniature LED type uviol lamp 15 provides power supply;
Anti-flammability power lead 16, for connecting direct supply 17 and power supply terminal 14.
Ultimate principle of the present invention: when the T stern notch of magnetic pole yoke is magnetized, the magnetic line of force that crackle will block by surface of the work, magnetic flux in magnetic circuit is distorted, cause part magnetic flux effusion surface of the work, stray field is formed in space, utilize magnetic induction part (probe) to obtain this signal, and by the process of detector to magnetic leakage signal, judge flaw size and the degree of depth.
Claims (10)
1. the detection method of high speed magnet pole of rotor of hydraulic generator yoke T stern notch, it is characterized in that: by magnet magnetization magnetic pole yoke T stern notch, the magnetic line of force by T stern notch surface has been blocked when there is crackle, magnetic flux in magnetic circuit is distorted, cause part magnetic flux effusion T stern notch surface, form stray field in space, utilize magneto sensor to obtain magnetic leakage signal, and by Magnetic Flux Leakage Testing Instrument, magnetic leakage signal is detected.
2. the detection method of high speed magnet pole of rotor of hydraulic generator yoke T stern notch according to claim 1, it is characterized in that: by probe guiding trestle, probe is delivered to detection position, and utilize constant force structure to make probe be close to subject face, the magnetization of П shape magnet A detects the ferromagnetism lamination at position, produce induced field, when the magnetic line of force excited runs into crackle on the tested position of T stern notch, stray field will be formed in cracks, stray field is received by the magneto sensor in popping one's head in and is converted into digital signal, by Magnetic Flux Leakage Testing Instrument, signal transacting and display are carried out to crack stray field, thus judge whether tested T stern notch exists crackle.
3. the detection method of high speed magnet pole of rotor of hydraulic generator yoke T stern notch according to claim 2, it is characterized in that: the method whether tested T stern notch of described judgement exists crackle is, be placed in by guiding trestle by three-dimensional hall probe and detect position, the Hall element Z in three-dimensional hall probe is parallel with magnetic pole rim lamination plane; Make X, Y, Z tri-equal zero setting of direction signal of three-dimensional hall probe; When X-direction signal is more than or equal to 25:1 with the ratio of Z-direction signal intensity or when Y-direction signal is more than or equal to 50:1 with the ratio of Z-direction signal intensity, then judge that the laminate surface of detection site exists abnormal.
4. the detection method of high speed magnet pole of rotor of hydraulic generator yoke T stern notch according to claim 3, be is characterized in that, then rechecked the position that there is anomalous field by magnetic powder detection method; Magnetic powder detection method is carried out in the steps below:
Snag clearly abnormal signal portion faces in Magnetic testi;
Open Magnetic testing installation's power source;
The probe of Magnetic testing device is placed in abnormal portion faces;
Weak vibrations magnetic flaw detection ink watering can, evenly sprays magnetic flaw detection ink at abnormal portion faces;
Be applied to the magnetic on surface by stray field absorption, under the ultraviolet illumination of 365nm wavelength, form visual visible magnetic trace, thus determine that detected magnetic pole yoke T stern notch exists crackle.
5. the detection method of high speed magnet pole of rotor of hydraulic generator yoke T stern notch according to claim 4, it is characterized in that, described magnetic flaw detection ink is mixed by the raw material of following weight portion: 71-73 part ethanol, 16-18 part ethyl acetate, 2.5-3.5 part methenyl choloride, 1.5-2.5 part acetone, 0.15-0.25 part MPI fluorescent magnetic particles; MPI fluorescent magnetic particles granularity is 350 orders.
6. realize the pick-up unit of the high speed magnet pole of rotor of hydraulic generator yoke T stern notch detection method described in any one of claim 1-4, it is characterized in that: comprise crackle probe detector (5), guiding trestle (4) and Magnetic Flux Leakage Testing Instrument (1), crackle probe detector (5) is arranged on guiding trestle (4), and crackle probe detector (5) is connected with Magnetic Flux Leakage Testing Instrument (1) by signal transmssion line (2); Described crackle probe detector (5) comprises and is fixed on П shape magnet A (9) on guiding trestle (4) and three-dimensional hall probe (12) through elastic component (6), three-dimensional hall probe (12) is arranged between opening part the two poles of the earth of П shape magnet A (9), and extending out to forward the top of П shape magnet A (9) bipod inclined-plane extension, described three-dimensional hall probe (12) is amplified by signal and D/A converting circuit (11) is connected with signal transmssion line (2) through signal terminal (10).
7. the pick-up unit of high speed magnet pole of rotor of hydraulic generator yoke T stern notch according to claim 6, it is characterized in that: described three-dimensional hall probe (12) is three-dimensional magnetosensitive Hall element array, be made up of the orthogonal sheet Hall element of X, Y, Z tri-, three Hall element landing tees are put, and can measure the magnetic field size and Orientation on XYZ tri-directions simultaneously.
8. the pick-up unit of high speed magnet pole of rotor of hydraulic generator yoke T stern notch according to claim 6, is characterized in that: described guiding trestle (4) is provided with handle (3), for mobile guide support.
9. the pick-up unit of high speed magnet pole of rotor of hydraulic generator yoke T stern notch according to claim 6, it is characterized in that: described П shape magnet A (9), for neodymium nickel cobalt type permanent magnet, for magnetizing tested position, opening the two poles of the earth pin inclined plane shape at 45 °, fits with T stern notch inside lock two sides respectively.
10. the pick-up unit of high speed magnet pole of rotor of hydraulic generator yoke T stern notch according to claim 6, is characterized in that: also comprise crackle Magnetic testing device; Crackle Magnetic testing device comprises П shape magnet B (13), is neodymium nickel cobalt type permanent magnet, and for magnetizing tested position, opening the two poles of the earth pin inclined plane shape at 45 °, fits with T stern notch inside lock two sides respectively;
Centre wavelength is the miniature LED type uviol lamp (15) of 365nm, is fixed between П shape magnet B (13) opening part two-stage, for fluorescence excitation magnetic;
Power supply terminal (14), is arranged in П shape magnet B (13), connects miniature LED type uviol lamp (15);
The direct supply (17) of belt switch and shutoff display, internal battery, for miniature LED type uviol lamp (15) provides power supply;
Anti-flammability power lead (16), for connecting direct supply (17) and power supply terminal (14).
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| CN201410741134.9A CN104458894B (en) | 2014-12-08 | 2014-12-08 | The detection method and its device of high speed magnet pole of rotor of hydraulic generator yoke T stern notches |
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| CN201410741134.9A CN104458894B (en) | 2014-12-08 | 2014-12-08 | The detection method and its device of high speed magnet pole of rotor of hydraulic generator yoke T stern notches |
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| CN105510353A (en) * | 2015-11-26 | 2016-04-20 | 国家电网公司 | Generator rotor magnetic pole T tail groove crack automatic detection device |
| CN114994006A (en) * | 2022-07-20 | 2022-09-02 | 安徽省国盛量子科技有限公司 | Crack orthogonal detection system and detection method based on NV color center sensing technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105510353A (en) * | 2015-11-26 | 2016-04-20 | 国家电网公司 | Generator rotor magnetic pole T tail groove crack automatic detection device |
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| CN114994006A (en) * | 2022-07-20 | 2022-09-02 | 安徽省国盛量子科技有限公司 | Crack orthogonal detection system and detection method based on NV color center sensing technology |
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| CN104458894B (en) | 2017-06-06 |
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