CN104677982B - It is a kind of to revolve control magnet yoke type permanent magnet flaw detector and carry out the method for workpiece flaw detection using it - Google Patents
It is a kind of to revolve control magnet yoke type permanent magnet flaw detector and carry out the method for workpiece flaw detection using it Download PDFInfo
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- CN104677982B CN104677982B CN201510107962.1A CN201510107962A CN104677982B CN 104677982 B CN104677982 B CN 104677982B CN 201510107962 A CN201510107962 A CN 201510107962A CN 104677982 B CN104677982 B CN 104677982B
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Abstract
The present invention is a kind of to revolve control magnet yoke type permanent magnet flaw detector and is related to a kind of workpiece sensing apparatus and method using the method for its progress workpiece flaw detection.A kind of when carrying out Non-Destructive Testing to workpiece surface, the relatively low detection device of detection error its purpose is to provide.A kind of rotation control magnet yoke type permanent magnet flaw detector of the invention, including：Main body, two adjusting brackets, two spy pin；The left and right ends of the main body are provided with a support separately down；The lower end of each support corresponds to be hinged an adjusting bracket respectively；The lower end of each adjusting bracket corresponds to be hinged spy pin respectively again；Each bottom for visiting pin is provided with a breach.A kind of method detected to workpiece of the present invention includes defectoscope Verification, two big step of examinations.
Description
Technical field
The present invention relates to a kind of workpiece sensing equipment, and the method detected to workpiece is set using the detection.
Background technology
Magnetic powder flaw detector is also known as portable defectoscope, and it uses controllable silicon to make noncontacting switch, noise is small, long lifespan, behaviour
Make simple and convenient, strong applicability, working stability.It is divided into electromagnetic yoke flaw detection instrument, rotating excitation field defectoscope by the mode of magnetization, by electric current
Be divided into the magnetic powder flaw detectors such as alternating current and direct current, AC/DC type, DC power supply is rechargeable battery, suitable for field without
The execute-in-place such as power supply execute-in-place and the inaccessiable container of high pressure, bridge, pipeline, once charging stream time can
Up to more than 6 hours.Communication power supply use~220V power supplys directly input, supporting without other instruments, easy to operate, simple
It is single, in light weight, be easy to carry, thus the instrument is used widely.
Chinese patent CN103543198 discloses a kind of rotation control magnet yoke type permanent magnet flaw detector, and the patent is by spy pin, soft magnetism
Part, strong magnetic member, rotary switch, gland, hand handle and non-magnetic member composition；Visit pin and be arranged on soft magnetism part bottom, strong magnetic member
Among two pieces of soft magnetism parts, two pieces of soft magnetism parts are separated by non-magnetic member, and gland is arranged on soft magnetism part, and hand handle is led to
Hand handle piece is crossed at the top of soft magnetism part.The patent solve thes problems, such as that defectoscope leads to magnetic, disconnected magnetic difficulty forever.But its
Also with other like products of in the market there is it is same the problem of：As shown in figure 5, the contact surface for visiting pin and workpiece connects for line
Touch, from contact line to workpiece at left and right sides of magnetizability diminuendo, if detected using this defectoscope to curve surface work pieces, work
The degree that part surface is magnetized is uneven, it may appear that larger error.
The content of the invention
Main technical problems to be solved of the invention are to provide one kind when carrying out Non-Destructive Testing to workpiece surface, and detection misses
The relatively low rotation control magnet yoke type permanent magnet flaw detector of difference.
Further technical problems to be solved of the invention are to provide a kind of can precisely examine to the workpiece of different profiles
The rotation control magnet yoke type permanent magnet flaw detector of survey
This is to provide a kind of rotation control simple in construction, being conveniently replaceable probe using new further technical problems to be solved
Yoke formula permanent-magnet flaw detector, so that the workpiece to different profiles can be detected precisely.
Technical problems to be solved main in addition of the invention are to provide a kind of higher to workpiece surface quality accuracy of detection
Method：
A kind of rotation control magnet yoke type permanent magnet flaw detector of the invention, including：Main body, two adjusting brackets, two spy pin；
The left and right ends of the main body are provided with a support separately down；The lower end of each support corresponds to be hinged one respectively
Adjusting bracket；The lower end of each adjusting bracket corresponds to be hinged spy pin respectively again；
Each bottom for visiting pin is provided with a breach.
A kind of rotation control magnet yoke type permanent magnet flaw detector of the invention, wherein the vertical sectional shape for visiting sole end breach is circular arc
Shape or broken polygonal line shape.
A kind of rotation control magnet yoke type permanent magnet flaw detector of the invention, wherein the spy pin includes foot lever and probe；Wherein described pin
Bar is detachable connection with probe；The foot lever and the lower end of the adjusting bracket are hinged, and the lower end of the probe is provided with institute
State breach.
A kind of rotation control magnet yoke type permanent magnet flaw detector of the invention, wherein the lower end of the foot lever sets boss, the probe
Upper end is provided with the groove corresponding with the boss, and has mutually corresponding lead in the side of the boss, groove
Hole；The foot lever is solidified as a whole with popping one's head in by the cooperation of the boss and groove and the cooperation of bolt and the through hole.
A kind of method for being detected a flaw to workpiece of the present invention is as follows：
A. defectoscope Verification：
A lifting forces are verified
A) reference block is chosen first, and the reference block has specific weight, and the surface shape of the reference block
Shape is identical with the surface configuration of workpiece to be detected；Two kinds of probes with different notch geometries are also chosen simultaneously, be designated as X respectively
Probe, Y probes；
B) from X probes as lifting probe, and X probes are assembled on defectoscope；
C) X of defectoscope is popped one's head in and fully contacted in a lateral direction with above-mentioned standard test block, after defectoscope switches on power
Defectoscope is lifted up.If reference block during lifting defectoscope is also lifted simultaneously, then the spy equipped with X probes
The lifting force for hindering instrument meets to require, otherwise on the contrary.
D) from Y probes as lifting probe, and Y probes are assembled on defectoscope；
E) defectoscope Y is popped one's head in and fully contacted in a longitudinal direction with above-mentioned standard test block, defectoscope will after switching on power
Defectoscope is lifted up.If reference block during lifting defectoscope is also lifted simultaneously, then the flaw detection equipped with Y probes
The lifting force of instrument meets to require, otherwise on the contrary.
B sensitivity is verified
A) Calibration Piece for Sensitivity is chosen first, and the Calibration Piece for Sensitivity has the cutting defect of standard；
B) two probes of the defectoscope popped one's head in equipped with X are fully contacted with workpiece to be detected in a lateral direction respectively,
And above-mentioned Calibration Piece for Sensitivity is placed on the region between two probes；
C) defectoscope switches on power magnetizes to Calibration Piece for Sensitivity, and magnetization number is 2~3 times；In order to clearly show
To the magnetized effect of Calibration Piece for Sensitivity, also need to spray magnetic flaw detection ink to Calibration Piece for Sensitivity table piece in magnetic history, if through magnetic
Calibration Piece for Sensitivity surface after change has clear earth magnetism trace, then the sensitivity of the defectoscope meets to require, otherwise on the contrary.
D) two probes of the defectoscope popped one's head in equipped with Y are fully contacted with workpiece to be detected in a longitudinal direction respectively,
And above-mentioned Calibration Piece for Sensitivity is placed on the region between two probes；
E) defectoscope switches on power magnetizes to Calibration Piece for Sensitivity, and magnetization number is 2~3 times；In order to clearly show
To the magnetized effect of Calibration Piece for Sensitivity, also need to spray magnetic flaw detection ink to Calibration Piece for Sensitivity table piece in magnetic history.If through magnetic
Calibration Piece for Sensitivity surface after change has clear earth magnetism trace, then the sensitivity of the defectoscope meets to require, otherwise on the contrary.
B. examinations：
A is first by the surface spraying contrast enhancement agents of workpiece to be detected；
B fully contacts the qualified defectoscope equipped with X probes of Verification with workpiece to be detected in a lateral direction；Visit
Hinder after instrument switches on power and workpiece is magnetized, magnetic flaw detection ink at the same time is sprayed to workpiece surface；Fully workpiece is observed after magnetization
There is zero defect on surface；
C fully contacts the qualified defectoscope equipped with Y probes of Verification with workpiece to be detected in a longitudinal direction；Visit
Hinder after instrument switches on power and workpiece is magnetized, magnetic flaw detection ink at the same time is sprayed to workpiece surface；Fully workpiece is observed after magnetization
There is zero defect on surface；So far the detection of to workpiece the defects of is fully completed.
A kind of method detected a flaw to workpiece of the present invention, wherein in the b and step B of the step B c, power supply connects
Energization source is 3~5s to the workpiece progress magnetized duration.
A kind of rotation control magnet yoke type permanent magnet flaw detector difference with the prior art of the invention is a kind of rotation control yoke of the invention
The bottom (i.e. and work piece interface) that pin is visited in formula permanent-magnet flaw detector is provided with breach, and the concrete shape of breach is according to workpiece surface
Depending on shape.The distinctive points cause the surface of defectoscope and workpiece to completely attach to, and so as to which workpiece can be fully magnetized, detect
As a result can be more accurate, it is all in all to improve the precision to workpiece detection.
In rotation control magnet yoke type permanent magnet flaw detector of the invention a kind of, visit the vertical sectional shape of sole end breach for circular arc or
The breach of broken polygonal line shape, wherein circular arc is applied to curve surface work pieces, and the breach of broken polygonal line shape is applied to have rib workpiece.Thus
As can be seen that a kind of control magnet yoke type permanent magnet flaw detector of revolving of the present invention is adapted to detect the workpiece of various shapes.
In a kind of rotation control magnet yoke type permanent magnet flaw detector of the invention, visit pin and be further divided into two portions of foot lever and probe
Part, and two parts are detachable connection；When in order to adapt to workpiece of different shapes, only probe, nothing need to be changed
Whole parts need to be dismantled, greatly save the replacing construction between different breach spy pin.
A kind of method detected a flaw to workpiece of the present invention is due to having used above-mentioned improved defectoscope, to workpiece magnetizing
Degree is more full and uniform, it is ensured that the precision detected to workpiece surface.
A kind of rotation control magnet yoke type permanent magnet flaw detector of the invention is further described below in conjunction with the accompanying drawings.
Brief description of the drawings
Fig. 1 is a kind of stereogram for revolving control magnet yoke type permanent magnet flaw detector and being drawn close in spy pin under state of the present invention；
Fig. 2 is a kind of stereogram for revolving control magnet yoke type permanent magnet flaw detector in the case where visiting pin and being vertical state of the present invention；
Fig. 3 is a kind of front view for revolving control magnet yoke type permanent magnet flaw detector of the present invention, and the figure also show defectoscope and work
The position relationship of part；
Fig. 4 is that breach longitudinal section is that the spy pin of broken polygonal line shape is faced in a kind of rotation control magnet yoke type permanent magnet flaw detector of the present invention
Figure；
Fig. 5 is the fiting relation figure for visiting pin and workpiece in the prior art；
Fig. 6 is the spy pin stereogram that probe is X probes；
Fig. 7 is the spy pin stereogram that probe is Y probes；
Fig. 8, which is that the present invention is a kind of, revolves the exploded view that pin is visited in control magnet yoke type permanent magnet flaw detector.
Embodiment
As shown in figures 1-4, a kind of rotation control magnet yoke type permanent magnet flaw detector of the present invention, including：Main body 1, two adjusting brackets
21st, 22, two spy pin 31,32.
The left and right ends of main body 1 are provided with a support 11,12 separately down；The lower end of each support corresponds to be hinged one respectively
Individual adjusting bracket 21,22, adjusting bracket 21,22 to the angular adjustment of itself by being adapted to various sizes of workpiece；It is each to adjust
The lower end for saving support 21,22 corresponds to be hinged spy pin 31,32 respectively again；Each bottom for visiting pin 31,32 has a breach
41st, 42, the wherein vertical sectional shape of breach 41,42 is depending on the profile of workpiece, to be coincide substantially with workpiece surface for standard,
Can be specifically circular arc, broken polygonal line shape and other curve shapes.
Such as Fig. 4, shown in 6~8, in order to realize the different rapid translatings for visiting pin breach in the present embodiment, with to different shape
Workpiece carry out accurately detecting, visit pin be further designed to foot lever 3a with pop one's head in 3b assembly.Wherein foot lever 3a's is upper
The lower end with adjusting bracket is held to be hinged, foot lever 3a lower end sets boss 3c；Probe 3b upper end is provided with relative with boss 3c
The groove 3d answered, the 3b that pops one's head in lower end are provided with above-mentioned breach, sockets of the foot lever 3a with probe 3b by boss 3c and groove 3d
It is solidified as a whole.In order to ensure the fastness that foot lever 3a is connected with probe 3b, also phase is had in boss 3c, groove 3d side
Through hole 3e, 3f corresponding to mutually, by bolt and through hole 3e, 3f cooperation i.e. by foot lever 3a and probe 3b strong bondeds.
The process detected a flaw using a kind of rotation control magnet yoke type permanent magnet flaw detector of the present invention to workpiece is as follows：
A. defectoscope Verification：
A lifting forces are verified
A) reference block is chosen first, and the reference block has specific weight, and the surface shape of the reference block
Shape is identical with the surface configuration of workpiece to be detected；Two kinds of probes with different notch geometries are also chosen simultaneously, be designated as X respectively
Probe, Y probes, the shape of wherein X probe breach match with reference block in a lateral direction, and the shape of Y probe breach exists
Matched on longitudinal direction with reference block；
B) from X probes as lifting probe, and X probes are assembled on defectoscope；
C) X of defectoscope is popped one's head in and fully contacted in a lateral direction with above-mentioned standard test block, after defectoscope switches on power
Defectoscope is lifted up.If reference block during lifting defectoscope is also lifted simultaneously, then the spy equipped with X probes
The lifting force for hindering instrument meets to require, otherwise on the contrary.
D) from Y probes as lifting probe, and Y probes are assembled on defectoscope；
E) defectoscope Y is popped one's head in and fully contacted in a longitudinal direction with above-mentioned standard test block, defectoscope will after switching on power
Defectoscope is lifted up.If reference block during lifting defectoscope is also lifted simultaneously, then the flaw detection equipped with Y probes
The lifting force of instrument meets to require, otherwise on the contrary.
B sensitivity is verified
A) Calibration Piece for Sensitivity is chosen first, and the Calibration Piece for Sensitivity has the cutting defect of standard；
B) two probes of the defectoscope popped one's head in equipped with X are fully contacted with workpiece to be detected in a lateral direction respectively,
And above-mentioned Calibration Piece for Sensitivity is placed on the region between two probes；
C) defectoscope switches on power magnetizes to Calibration Piece for Sensitivity, and magnetization number is 2~3 times；In order to clearly show
To the magnetized effect of Calibration Piece for Sensitivity, also need to spray magnetic flaw detection ink to Calibration Piece for Sensitivity table piece in magnetic history.If through magnetic
Calibration Piece for Sensitivity surface after change has clear earth magnetism trace, then the sensitivity of the defectoscope meets to require, otherwise on the contrary.
D) two probes of the defectoscope popped one's head in equipped with Y are fully contacted with workpiece to be detected in a longitudinal direction respectively,
And above-mentioned Calibration Piece for Sensitivity is placed on the region between two probes；
E) defectoscope switches on power magnetizes to Calibration Piece for Sensitivity, and magnetization number is 2~3 times；In order to clearly show
To the magnetized effect of Calibration Piece for Sensitivity, also need to spray magnetic flaw detection ink to Calibration Piece for Sensitivity table piece in magnetic history.If through magnetic
Calibration Piece for Sensitivity surface after change has clear earth magnetism trace, then the sensitivity of the defectoscope meets to require, otherwise on the contrary.
B. examinations：
A is first by the surface spraying contrast enhancement agents of workpiece to be detected；
Above-mentioned parameter is verified that the qualified defectoscope equipped with X probes fully connects in a lateral direction with workpiece to be detected by b
Touch；Defectoscope carries out continuing 3~5s of magnetization after switching on power to workpiece, at the same time sprays magnetic flaw detection ink to workpiece surface；Fully
Workpiece surface is observed after magnetization zero defect；
Above-mentioned parameter is verified that the qualified defectoscope equipped with Y probes fully connects in a longitudinal direction with workpiece to be detected by c
Touch；Defectoscope carries out continuing 3~5s of magnetization after switching on power to workpiece, at the same time sprays magnetic flaw detection ink to workpiece surface；Fully
Workpiece surface is observed after magnetization zero defect；So far the detection of to workpiece the defects of is fully completed.
Fig. 3 is the operation principle schematic diagram of the present embodiment, wherein in order to clearly explain the stressing conditions of workpiece, to left side
Workpiece offset downward.By Fig. 3 force analysis only, probe contacts with workpiece for face, and workpiece is magnetic field force induced everywhere
Size is identical, namely workpiece is magnetized uniformly, beneficial to the detection to workpiece surface crackle by magnetic field.And Fig. 5 is the work of prior art
Make principle, from Fig. 5 force analysis, probe and workpiece are linear contact lay, and workpiece stress by contact line, successively decrease to the left and right by both sides,
That is workpiece discontinuity everywhere, workpiece is variant by magnetic field magnetization degree everywhere, is unfavorable for the detection to workpiece surface crackle.
Comprehensive Correlation understands that the present embodiment is more accurate to the result of workpiece sensing.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, technical side of the those of ordinary skill in the art to the present invention
The various modifications and improvement that case is made, it all should fall into the protection domain of claims of the present invention determination.
Claims (4)
1. one kind rotation control magnet yoke type permanent magnet flaw detector, including：Main body, two adjusting brackets, two spy pin；
The left and right ends of the main body are provided with a support separately down；The lower end of each support corresponds to a be hinged regulation respectively
Support；The lower end of each adjusting bracket corresponds to be hinged spy pin respectively again；
It is characterized in that：Each bottom for visiting pin is provided with a breach；
The vertical sectional shape for visiting sole end breach is circular arc or broken polygonal line shape；
The spy pin includes foot lever and probe；Wherein described foot lever is detachable connection with probe；The foot lever and the tune
The lower end of section support is hinged, and the lower end of the probe is provided with the breach.
A kind of 2. rotation control magnet yoke type permanent magnet flaw detector according to claim 1, it is characterised in that：The lower end of the foot lever is set
Boss is put, the upper end of the probe is provided with the groove corresponding with the boss, and distinguishes in the side of the boss, groove
It is provided with mutually corresponding through hole；The foot lever passes through the cooperation of the boss and groove and bolt and the through hole with probe
Cooperation is solidified as a whole.
3. the method that a kind of rotation control magnet yoke type permanent magnet flaw detector described in usage right requirement 2 is detected a flaw to workpiece is as follows：
A. defectoscope Verification：
A lifting forces are verified；
A) choose a reference block first, the reference block has specific weight, and the surface configuration of the reference block with
The surface configuration of workpiece to be detected is identical；Two kinds of probes with different notch geometries are also chosen simultaneously, be designated as X spies respectively
Head, Y probes；
B) from X probes as lifting probe, and X probes are assembled on defectoscope；
C) X of defectoscope is popped one's head in and fully contacted in a lateral direction with above-mentioned standard test block, defectoscope will be visited after switching on power
Hinder instrument to be lifted up；If reference block during lifting defectoscope is also lifted simultaneously, then the defectoscope equipped with X probes
Lifting force meet require, it is otherwise on the contrary；
D) from Y probes as lifting probe, and Y probes are assembled on defectoscope；
E) defectoscope Y is popped one's head in and fully contacted in a longitudinal direction with above-mentioned standard test block, defectoscope will flaw detection after switching on power
Instrument is lifted up；If reference block during lifting defectoscope is also lifted simultaneously, then equipped with the Y defectoscopes popped one's head in
Lifting force meets to require, otherwise on the contrary；
B sensitivity is verified；
A) Calibration Piece for Sensitivity is chosen first, and the Calibration Piece for Sensitivity has the cutting defect of standard；
B) two probes of the defectoscope popped one's head in equipped with X are fully contacted with workpiece to be detected in a lateral direction respectively, and will
Above-mentioned Calibration Piece for Sensitivity is placed on the region between two probes；
C) defectoscope switches on power magnetizes to Calibration Piece for Sensitivity, and magnetization number is 2~3 times；In order to clearly show to spirit
The magnetized effect of sensitivity test piece, also need to spray magnetic flaw detection ink to Calibration Piece for Sensitivity table piece in magnetic history；If after magnetization
Calibration Piece for Sensitivity surface there is clear earth magnetism trace, then the defectoscope sensitivity meet require, it is otherwise on the contrary；
D) two probes of the defectoscope popped one's head in equipped with Y are fully contacted with workpiece to be detected in a longitudinal direction respectively, and will
Above-mentioned Calibration Piece for Sensitivity is placed on the region between two probes；
E) defectoscope switches on power magnetizes to Calibration Piece for Sensitivity, and magnetization number is 2~3 times；In order to clearly show to spirit
The magnetized effect of sensitivity test piece, also need to spray magnetic flaw detection ink to Calibration Piece for Sensitivity table piece in magnetic history, if after magnetization
Calibration Piece for Sensitivity surface there is clear earth magnetism trace, then the defectoscope sensitivity meet require, it is otherwise on the contrary；
B. examinations：
A is first by the surface spraying contrast enhancement agents of workpiece to be detected；
B fully contacts the qualified defectoscope equipped with X probes of Verification with workpiece to be detected in a lateral direction；Defectoscope
Workpiece is magnetized after switching on power, magnetic flaw detection ink at the same time is sprayed to workpiece surface；Fully workpiece surface is observed after magnetization
There is zero defect；
C fully contacts the qualified defectoscope equipped with Y probes of Verification with workpiece to be detected in a longitudinal direction；Defectoscope
Workpiece is magnetized after switching on power, magnetic flaw detection ink at the same time is sprayed to workpiece surface；Fully workpiece surface is observed after magnetization
There is zero defect；So far the detection of to workpiece the defects of is fully completed.
A kind of 4. method detected a flaw to workpiece according to claim 3, it is characterised in that：The b of the step B, with
And in step B c, power on power supply is 3~5s to the workpiece progress magnetized duration.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510107962.1A CN104677982B (en) | 2015-03-12 | 2015-03-12 | It is a kind of to revolve control magnet yoke type permanent magnet flaw detector and carry out the method for workpiece flaw detection using it |
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|---|---|---|---|
| CN201510107962.1A CN104677982B (en) | 2015-03-12 | 2015-03-12 | It is a kind of to revolve control magnet yoke type permanent magnet flaw detector and carry out the method for workpiece flaw detection using it |
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| CN104677982B true CN104677982B (en) | 2018-02-02 |
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Families Citing this family (4)
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| CN105628441B (en) * | 2016-01-11 | 2018-04-06 | 浙江理工大学 | One kind fixed point water acquisition equipment |
| CN110133096A (en) * | 2019-05-05 | 2019-08-16 | 湖北圣信特种设备检测有限公司 | A kind of portable magnetic yoke defectoscope |
| CN113109421A (en) * | 2021-04-19 | 2021-07-13 | 北京工业大学 | Micro-magnetic nondestructive detection sensor suitable for concave curved surface |
| CN113655115A (en) * | 2021-07-21 | 2021-11-16 | 大唐东北电力试验研究院有限公司 | Telescopic alternating current magnetic yoke probe device |
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| CN2063642U (en) * | 1989-12-21 | 1990-10-10 | 李履平 | Permanent magnet magnetic powder crack detector |
| CN2103812U (en) * | 1991-10-22 | 1992-05-06 | 机电部机械院可靠性中心 | Single-hand flaw detector for permanent magnetic powder |
| CN103091394A (en) * | 2012-10-31 | 2013-05-08 | 吴江市宏达探伤器材有限公司 | Electromagnetic yoke probe |
| CN103543198A (en) * | 2013-11-05 | 2014-01-29 | 广西壮族自治区特种设备监督检验院 | Rotary control magnet yoke type permanent magnet flaw detector |
| CN204439593U (en) * | 2015-03-12 | 2015-07-01 | 天津阿斯米工程技术有限公司 | Revolve control yoke formula permanent-magnet flaw detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3378762A (en) * | 1967-07-05 | 1968-04-16 | Phillip J. Parker | Magnetic particle inspection probe with adjustable probe legs and self-contained circuitry for a.c. or d.c. testing |
| CN2063642U (en) * | 1989-12-21 | 1990-10-10 | 李履平 | Permanent magnet magnetic powder crack detector |
| CN2103812U (en) * | 1991-10-22 | 1992-05-06 | 机电部机械院可靠性中心 | Single-hand flaw detector for permanent magnetic powder |
| CN103091394A (en) * | 2012-10-31 | 2013-05-08 | 吴江市宏达探伤器材有限公司 | Electromagnetic yoke probe |
| CN103543198A (en) * | 2013-11-05 | 2014-01-29 | 广西壮族自治区特种设备监督检验院 | Rotary control magnet yoke type permanent magnet flaw detector |
| CN204439593U (en) * | 2015-03-12 | 2015-07-01 | 天津阿斯米工程技术有限公司 | Revolve control yoke formula permanent-magnet flaw detector |
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