CN107561155A - Special-shaped coils wheel is to magnetic powder inspection device - Google Patents
Special-shaped coils wheel is to magnetic powder inspection device Download PDFInfo
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Abstract
The present invention relates to a kind of special-shaped coils wheel to magnetic powder inspection device, it is characterised in that：Longitudinal magnetizing device is made up of four coils, by being respectively equipped with the L01 coils being disposed vertically, L04 coils to a pair of hub peripheries of workpiece in wheel, a pair horizontal positioned L02 coils, L03 coils are provided with below wheel shaft between a pair of wheel hubs of the wheel to workpiece, L01 coils, L02 coils and L03 coils, L04 coils respectively constitute two L-shaped coils；The current phase of two L-shaped coils intersects 60 °, forms the special-shaped coils magnetizing assembly recommended, in wheel to forming complete from left to right longitudinal magnetic field on workpiece.The present apparatus is detected without dead angle, non-blind area, is all greatly improved in function and performance；It is simple in construction, cost is low, versatile, the Magnetic testing suitable for various wheels to, the workpiece such as axletree, gear shaft；And easy to use, detection efficiency is high, reduce that the labor intensity of worker is low, improve the service life of failure detector.
Description
Technical field：
The present invention is applied to nondestructive inspection category；It is related to magnetic materials such as steel and non-by the component of machine of this class material manufacture
Destructive magnetic crack detection；Specific shaft-like workpiece, I. C. engine crankshaft, other moulding complexity for applying to train wheel equity belt wheel
The magnetic powder inspection of special-shaped workpiece；Especially a kind of special-shaped coils wheel that nondestructive inspection detection is carried out for igneous rock cracks type of workpiece
To magnetic powder inspection device.
Background technology：
Magnetic testing principle：Magnetic powder inspection is as a kind of conventional to ferrimagnet workpiece surface and the lossless inspection of near surface progress
The means of survey, are widely used in recent years, and ferromagnetic workpiece is placed in externally-applied magnetic field, and workpiece is magnetized, magnetic force
Line forms certain trend on the surface of test specimen and near surface, if workpiece surface and near surface have crackle or defect, and and magnetic
When the line of force intersects certain angle, then it can cause the change of magnetic flux density, the part magnetic line of force is twisted, and leaks into shape in the middle of air
Into leakage magnetic flux, magnetic pole is formed in fault location；By the magnetic of certain viscosity and magnetic conductivity（Such as magnetic flaw detection ink）, it is sprayed at the table of test specimen
Face, after test specimen is magnetized, then the both sides magnetic pole absorption magnetic of defect, the accumulation of magnetic forms magnetic trace, and the outward appearance of magnetic trace is shown
The length of defect, trend, etc. a series of contour images, so as to reach the purpose of defect detecting test；
With magnetic particle inspection apparatus to rolling stock wheel to carry out Non-Destructive Testing when, it is necessary to two wheel to wheel hub and two wheel pair
Between wheel hub, and wheel including the axle journal of both ends detects to three positions of axle；Defect-detecting equipment generally use circumference magnetic
Makeup is put and longitudinal magnetizing device；Circumferential magnetization device generally uses the method for direct-electrifying, axle of the defect detecting test wheel to workpiece
To crackle and defect；The method of longitudinal magnetization flaw detection is a lot, typically there is yoke method, folding coil method, comb-tooth-type folding method etc.；
Yoke method uses large-scale closed circuit yoke, applies longitudinal magnetic field to workpiece both ends to wheel, due to the shielding action of two wheel hubs,
Magnetic field inhomogeneity on axletree, the magnetic field intensity in the middle part of axletree often do not reach requirement；And it is complicated, cost is high, operation fiber crops
Tired, labor intensity is big；
Folding coil method uses multigroup folding coil, and the folding of coil is typically carried out by rack, gear mechanism；This structure is online
The easy loose contact in opening and closing place of circle, often sparking, also, carrying out flaw detection flow must carry out the folding of coil is complicated,
Cost is high, and speed is slow, and efficiency is low, troublesome in poeration, and labor intensity is big；
Comb-tooth-type folding method uses multigroup Π coils, is typically driven by the cylinder, and carries out the folding of Π coils, and Π coils are led with bottom
At electrical connection, also often cause to wear, take normal replacing, also, carrying out flaw detection flow must enter line because loose contact is struck sparks
The folding of circle, complicated, cost is high, and speed is slow, and efficiency is low, troublesome in poeration, and labor intensity is big.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide it is a kind of it is simple in construction, easy to operate, speed is fast,
Efficiency high, labor intensity are low, service life is long and the device is carried out magnetic to, the workpiece such as axletree, gear shaft to various wheels
The special-shaped coils wheel of detection is to magnetic powder inspection device；
To achieve the above object, the technical solution adopted in the present invention is：This kind of special-shaped coils wheel to magnetic powder inspection device, including
Circumferential magnetization device, circumferential magnetization power supply " V1 ", longitudinal magnetization power supply " V2 ", circumferential magnetization power supply " V1 ", longitudinal magnetization power supply
" V2 " using the power supply for intersecting 60 ° of phases, at least excitation supply is AC power all the way；Circumferential magnetization device, using in wheel pair
The both ends of the surface of workpiece spindle are furnished with battery lead plate, and two battery lead plates are connected with circumferential magnetization power supply respectively by circumferential connecting cable, its
It is characterised by：Longitudinal magnetizing device is made up of four coils, by being respectively equipped with vertically to a pair of hub peripheries of workpiece in wheel
L01 coils, the L04 coils of placement, a pair of horizontal positioned L02 are provided with to the lower section of wheel shaft between a pair of wheel hubs of workpiece in wheel
Coil, L03 coils；L01 coils, L02 coils and L03 coils, L04 coils respectively constitute two L-shaped coils；
Longitudinal magnetizing device, seen when from left to right, when L01 coils, L04 coils are same clockwise direction coiling；When on to
Under see, when L02 coils, L03 coils are also clockwise direction coiling, the attachment structure of four coils and longitudinal magnetization power supply is：
The head end of L01 coils is connected by longitudinally connected cable with longitudinal magnetization power supply left end, the tail end and L02 of L01 coils
The tail end of coil is connected, and forms the thrust magnetic field of special-shaped coils magnetizing assembly left end " L " shape coil；The head end of L02 coils with
The head end of L03 coils is connected, and the tail end of L03 coils is connected with the head end of L04 coils, and the tail end of L04 coils passes through longitudinal direction
Connecting cable is connected with longitudinal magnetization power supply right-hand member, forms the pulling force magnetic field of special-shaped coils magnetizing assembly right-hand member " L " shape coil；
Described special-shaped coils wheel is to magnetic powder inspection device, it is characterised in that：Longitudinal magnetizing device, seen when from left to right, L01 lines
When circle, L04 coils are same clockwise direction coiling；When seen from above, L02 coils are coiling counterclockwise, and L03 coils are suitable
During hour hands coiling, the attachment structure of four coils and longitudinal magnetization power supply is：
The head end of L01 coils is connected with the left end of longitudinal magnetization power supply, and the tail end of L01 coils is connected with the head end of L02 coils
Connect, form the pulling force magnetic field of special-shaped coils magnetizing assembly left end " L " shape coil；The head end phase of the tail end of L02 coils and L03 coils
Connection, the tail end of L03 coils are connected with the head end of L04 coils, and the tail end of L04 coils is connected with the right-hand member of longitudinal magnetization power supply
Connect, form the thrust magnetic field of special-shaped coils magnetizing assembly right-hand member " L " shape coil；
Described special-shaped coils wheel is to magnetic powder inspection device, it is characterised in that：L01 coils, L04 coils are in annular, are put respectively
Put at a pair of wheel hub excircles of the wheel to workpiece；
Described special-shaped coils wheel is to magnetic powder inspection device, it is characterised in that：L02 coils, L03 coils are rectangle, and are placed on
Take turns the lower section to wheel shaft between a pair of wheel hubs of workpiece.
The beneficial effect of the present invention compared with prior art：Due to using above-mentioned technical proposal, with original same category of device phase
Than being all greatly improved in function and performance, the present apparatus is detected without dead angle, non-blind area, fully meets Non-Destructive Testing magnetic
The purpose of powder flaw detection, can be possible to the workmanship of the most important part wheel pair of high-speed heavy-load trains, and during use
The crackle scar of appearance makes accurate magnetic powder inspection Non-Destructive Testing；The present invention is novel in design, simple in construction, cost is low,
It is versatile, the Magnetic testing suitable for various wheels to, the workpiece such as axletree, gear shaft；And easy to use, detection efficiency is high,
Reduce that the labor intensity of operating personnel is low, improve the service life of failure detector, have on engineer applied it is good before
Scape.
Brief description of the drawings：
Fig. 1：Circumferential magnetization apparatus structure sketch；
Fig. 2：Longitudinal magnetizing device structure diagram；
Fig. 3：Week, series composite magnetizer structure sketch；
Fig. 4：Wheel is to workpiece surface circumferential magnetization magnetic figure；
Fig. 5：Longitudinal magnetization abnormal shape coil magnetic figure；
Fig. 6：Wheel is to workpiece surface longitudinal magnetization magnetic figure；
Fig. 7：Wheel is to workpiece surface week, series composite magnetizing magnetic line chart；
Fig. 8：For A direction views in Fig. 2；
In figure：
1. take turns to workpiece, 2. battery lead plates, 3. longitudinally connected cables, 4. circumferential magnetization power supplys, 5.L01 coils, 6.L02 coils,
7.L03 coils, 8.L04 coils, 9. longitudinal magnetization power supplys, 10. circumferential connecting cables.
Embodiment：
In order to further illustrate above-mentioned purpose, technical scheme and the effect of the present invention, with reference to accompanying drawing and have by the following examples
Technological know-how known to pass illustrates the present invention：
Embodiment one：
As shown in figures 1-8, this kind of special-shaped coils wheel is to magnetic powder inspection device, including circumferential magnetization device, circumferential magnetization power supply 4
" V1 ", longitudinal magnetization power supply 9 " V2 ", circumferential magnetization power supply 4 " V1 ", longitudinal magnetization power supply 9 " V2 " are using the electricity for intersecting 60 ° of phases
Source, at least excitation supply is AC power all the way；Circumferential magnetization device, it is furnished with electrode to the both ends of the surface of the axle of workpiece 1 using in wheel
Plate 2, two battery lead plates 2 are connected with circumferential magnetization power supply 4 respectively by circumferential connecting cable 10；It is characterized in：Longitudinal flux is disguised
Put and be made up of four coils, by being respectively equipped with the L01 coils 5, the L04 that are disposed vertically to a pair of hub peripheries of workpiece 1 in wheel
Coil 8, a pair horizontal positioned L02 coils 6, L03 coils 7 are provided with to the lower section of wheel shaft between a pair of wheel hubs of workpiece 1 in wheel；
L01 coils 5, L02 coils 6 and L03 coils 7, L04 coils 8 respectively constitute two L-shaped coils；
Setting：The sense of current of longitudinal magnetization power supply 9 is that left end outflow right-hand member flows into；Longitudinal magnetizing device, seen when from left to right,
When L01 coils 5, L04 coils 8 are same clockwise direction coiling；When seen from above, L02 coils 6, L03 coils 7 are also to be suitable
During clockwise coiling, the attachment structure of four coils and longitudinal magnetization power supply 9, as shown in Figure 5：
The head end of L01 coils 5 is connected by longitudinally connected cable 3 with the left end of longitudinal magnetization power supply 9, then the magnetic force of L01 coils 5
Line direction is from left to right；The tail end of L01 coils 5 is connected with the tail end of L02 coils 6, then the magnetic line of force direction of L02 coils 6
For from bottom to top；So, the magnetic field combination of L01 coils 5 and L02 coils 6 is superimposed, and forms special-shaped coils magnetizing assembly left end " L "
The thrust magnetic field of shape coil；The head end of L02 coils 6 is connected with the head end of L03 coils 7, then the magnetic line of force direction of L03 coils 7
For from the top down；The tail end of L03 coils 7 is connected with the head end of L04 coils 8, and the tail end of L04 coils 8 passes through longitudinally connected electricity
Cable 3 is connected with the right-hand member of longitudinal magnetization power supply 9, then the magnetic line of force direction of L04 coils 8 is from left to right；So, the He of L03 coils 7
The magnetic field combination superposition of L04 coils 8, form the pulling force magnetic field of special-shaped coils magnetizing assembly right-hand member " L " shape coil；When negative half period electricity
When stream flows into, L01 coils 5 and L02 coils 6 form pulling force magnetic field, and L03 coils 7 and L04 coils 8 form thrust magnetic field；When just half
When all electric currents flow into, L01 coils 5 and L02 coils 6 form thrust magnetic field, and L03 coils 7 and L04 coils 8 form pulling force magnetic field；
By connection mutual between above-mentioned four coils and longitudinal magnetization power supply 9, form the magnetic field of two " L " shape coils and push away
Magnetic field is drawn, in wheel to forming complete longitudinal magnetic field on workpiece 1, forms special-shaped coils magnetizing assembly；
Embodiment two：
Second embodiment is another connecting structure form that longitudinal magnetization power supply 9 and four coils are end-to-end with each other, tool
Body connecting structure is as follows；
Setting：The sense of current of longitudinal magnetization power supply 9 is that left end outflow right-hand member flows into；Longitudinal magnetizing device, seen when from left to right,
When L01 coils 5, L04 coils 8 are same clockwise direction coiling；When seen from above, L02 coils 6 are coiling counterclockwise, L03
When coil 7 is coiling clockwise, the attachment structure of four coils and longitudinal magnetization power supply 9, as shown in Figure 5：
The head end of L01 coils 5 is connected with the left end of longitudinal magnetization power supply 9, then the magnetic line of force direction of L01 coils 5 is from left-hand
It is right；The tail end of L01 coils 5 is connected with the head end of L02 coils 6, then the magnetic line of force direction of L02 coils 6 is from bottom to top；That
, the magnetic field combination superposition of L01 coils 5 and L02 coils 6, the thrust magnetic of composition special-shaped coils magnetizing assembly left end " L " shape coil
；The tail end of L02 coils 6 is connected with the head end of L03 coils 7, then the magnetic line of force direction of L03 coils 7 is from the top down；L03
The tail end of coil 7 is connected with the head end of L04 coils 8, and the tail end of L04 coils 8 is connected with the right-hand member of longitudinal magnetization power supply 9,
Then the magnetic line of force direction of L04 coils 8 is from left to right；So, the magnetic field combination of L03 coils 7 and L04 coils 8 is superimposed, and is formed different
The pulling force magnetic field of shape coil magnetizing device right-hand member " L " shape coil；When negative half-cycle current flows into, L01 coils 5 and the structure of L02 coils 6
Into pulling force magnetic field, L03 coils 7 and L04 coils 8 form thrust magnetic field；When positive half cycle current flows into, L01 coils 5 and L02 lines
Circle 6 forms thrust magnetic field, and L03 coils 7 and L04 coils 8 form pulling force magnetic field；
Remaining structure of second embodiment and first embodiment is identical, will not be described in detail herein；
Form the magnetic field of two " L " shape coils and recommend magnetic field, coil it is different around to and four coils company with each other end to end
Connecing can have kinds of schemes to realize, simply two embodiments therein described above；
L01 coils 5, L04 coils 8 are in annular, are individually positioned in and take turns to a pair of wheel hub excircles of workpiece 1；L02 coils 6,
L03 coils 7 are rectangle, and are placed on lower section of the wheel to wheel shaft between a pair of wheel hubs of workpiece；
Special-shaped coils wheel is to the week of magnetic powder inspection device, the operation principle of longitudinal magnetic field：
Circumferential magnetization：
As Figure 1 and Figure 4, the circumferential magnetization of the present apparatus, using the method in wheel to the both ends direct-electrifying of workpiece 1, circumferential magnetization
The positive half cycle current direction of power supply 4 " V1 " is entered from right-hand member, left end outflow, such as accompanying drawing 4；According to right-hand rule, wheel pair
Circumferential magnetization magnetic field above workpiece 1 is the circumferential magnetic field to workpiece around wheel, and as shown in Figure 4, "+" represents the magnetic line of force in figure
Afterbody, flow into direction；" " represents magnetic line of force head, flows out direction；When the direct-electrifying circumferential magnetization power supply 4 " V1 " of application
For AC power, special-shaped coils wheel is around the alternation magnetic taken turns to the circumference of workpiece 1 to the circumferential magnetization magnetic field of magnetic powder inspection device
；
Longitudinal magnetization
The method that longitudinal magnetizing device uses special-shaped coils, the special-shaped coils of longitudinal magnetization are by four coil L01 coils 5, L02 lines
Circle 6, L03 coils 7, L04 coils 8 form, and as shown in Figure 2, coil L01 coils 5, L04 coils 8 are using being disposed vertically, respectively
From wheel the both ends of workpiece 1 are nested in hub periphery position of the wheel to workpiece 1；Coil L02 coils 6, L03 coils 7 are put using level
Put, the lower position assigned in wheel to wheel shaft between a pair of the wheel hubs of workpiece 1；
When the positive half cycle of longitudinal magnetization power supply 9 " V2 ", the magnetic field of L01 coils 5 is direction from left to right, as shown in Figure 5,
The Magnetic Field Design of L02 coils 6 is direction from bottom to top, and L01 coils 5, the combination of L02 coils 6 form the left end thrust of special-shaped coils
Coil；Meanwhile the Magnetic Field Design of L03 coils 7 is direction from the top down；The magnetic field of L04 coils 8 is direction from left to right；L03 lines
Circle 7, the combination of L04 coils 8 form the right-hand member pull coil of special-shaped coils；So, four coil L01 coils 5, L02 coils 6, L03
Coil 7, the combination of L04 coils 8 form the special-shaped coils magnetizing assembly recommended, and are completely from left to right indulged in wheel being formed on workpiece
To magnetic field, as shown in Figure 6；When the negative half period of longitudinal magnetization power supply 9 " V2 ", the magnetic field of L01 coils 5 is side from right to left
To；The magnetic field of L02 coils 6 is direction from the top down, and L01 coils 5, the combination of L02 coils 6 form the left end line of pull of special-shaped coils
Circle；Meanwhile the magnetic field of L03 coils 7 is direction from the top down；The magnetic field of L04 coils 8 is direction from right to left；L03 coils 7,
The combination of L04 coils 8 forms the right-hand member thrust coil of special-shaped coils；So, four coil L03 coils 7, L04 coils 8, L01 lines
Circle 5, the combination of L02 coils 6 form the special-shaped coils magnetizing assembly recommended, in wheel to forming complete from right to left vertical on workpiece
To magnetic field；When the longitudinal magnetization power supply 9 " V2 " of application is AC power, then, special-shaped coils wheel is indulged magnetic powder inspection device
Alternating magnetic field to magnetizing field for wheel to workpiece surface or so；
Week, longitudinal magnetization work simultaneously
As shown in Fig. 3, Fig. 7, when special-shaped coils wheel is to circumferential magnetization power supply 4 " V1 ", the longitudinal magnetization power supply of magnetic powder inspection device
9 " V2 " while when applying, then in wheel to forming the week for covering all surfaces, longitudinal magnetic field on workpiece 1, as shown in Figure 7；
Circumferential magnetization power supply 4 " V1 ", longitudinal magnetization power supply 9 " V2 " are using the power supply for intersecting 60 ° of phases, and at least magnetization is electric all the way
Source is AC power, workpiece 1 surface last week, longitudinal magnetic field is formed in wheel vector superposed, forms covering wheel to 1 whole tables of workpiece
The rotating excitation field in face, comprehensive carrying out flaw detection of the wheel to the surface of workpiece 1 is completed, form special-shaped coils compound magnetic of the wheel to workpiece 1
Change magnetic powder inspection device；
The part not explained in the present invention, it is prior art or can be realized by prior art, be not belonging to this hair
Bright protection domain；And heretofore described specific implementation case is only the preferable case study on implementation of the present invention, is not used for
Limit the practical range of the present invention；The equivalent changes and modifications that i.e. all contents according to scope of the present invention patent are made, all should
Technology category as the present invention.
Claims (4)
1. a kind of special-shaped coils wheel is to magnetic powder inspection device, including circumferential magnetization device, circumferential magnetization power supply（4 ）" V1 ", longitudinal direction
Excitation supply（9 ）" V2 ", circumferential magnetization power supply（4 ）" V1 ", longitudinal magnetization power supply（9 ）" V2 " is using the electricity for intersecting 60 ° of phases
Source, at least excitation supply is AC power all the way；Circumferential magnetization device, using wheel to workpiece（1）The both ends of the surface of axle are equipped with electricity
Pole plate（2）, two battery lead plates（2）Pass through circumferential connecting cable（10）Respectively with circumferential magnetization power supply（4）It is connected；Its feature exists
In：Longitudinal magnetizing device is made up of four coils, by taking turns to workpiece（1）A pair of hub peripheries be respectively equipped with and be disposed vertically
L01 coils（5）, L04 coils（8）, in wheel to workpiece（1）A pair of wheel hubs between wheel shaft lower section be provided with a pair it is horizontal positioned
L02 coils（6）, L03 coils（7）；L01 coils（5）, L02 coils（6）With L03 coils（7）, L04 coils（8）Respectively constitute
Two L-shaped coils；
Longitudinal magnetizing device, seen when from left to right, L01 coils（5）, L04 coils（8）For same clockwise direction coiling when；When
It is seen from above, L02 coils（6）, L03 coils（7）When being also clockwise direction coiling, four coils and longitudinal magnetization power supply
（9）Attachment structure be：
L01 coils（5）Head end pass through longitudinally connected cable（3）With longitudinal magnetization power supply（9）Left end is connected, L01 coils（5）
Tail end and L02 coils（6）Tail end be connected, form special-shaped coils magnetizing assembly left end " L " shape coil thrust magnetic field；
L02 coils（6）Head end and L03 coils（7）Head end be connected, L03 coils（7）Tail end and L04 coils（8）Head end phase
Connection, L04 coils（8）Tail end pass through longitudinally connected cable（3）With longitudinal magnetization power supply（9）Right-hand member is connected, and forms abnormity
The pulling force magnetic field of coil magnetizing device right-hand member " L " shape coil.
2. the special-shaped coils wheel according to patent requirements 1 is to magnetic powder inspection device, it is characterised in that：Longitudinal magnetizing device, when
See from left to right, L01 coils（5）, L04 coils（8）For same clockwise direction coiling when；When seen from above, L02 coils
（6）For coiling counterclockwise, L03 coils（7）For coiling clockwise when, four coils and longitudinal magnetization power supply（9）Attachment structure
For：
L01 coils（5）Head end and longitudinal magnetization power supply（9）Left end be connected, L01 coils（5）Tail end and L02 coils
（6）Head end be connected, form special-shaped coils magnetizing assembly left end " L " shape coil pulling force magnetic field；L02 coils（6）Tail end
With L03 coils（7）Head end be connected, L03 coils（7）Tail end and L04 coils（8）Head end be connected, L04 coils（8）
Tail end and longitudinal magnetization power supply（9）Right-hand member be connected, form special-shaped coils magnetizing assembly right-hand member " L " shape coil thrust magnetic
.
3. the special-shaped coils wheel according to patent requirements 1 is to magnetic powder inspection device, it is characterised in that：L01 coils（5）, L04 lines
Circle（8）In annular, wheel is individually positioned in workpiece（1）A pair of wheel hub excircles at.
4. the special-shaped coils wheel according to patent requirements 1 is to magnetic powder inspection device, it is characterised in that：L02 coils（6）, L03 lines
Circle（7）It is rectangle, is placed on lower section of the wheel to wheel shaft between a pair of wheel hubs of workpiece.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111912898A (en) * | 2020-07-21 | 2020-11-10 | 杭州兴发弹簧有限公司 | Double-mode magnetic powder flaw detection device with energized and energized spiral compression spring |
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| CN1247980A (en) * | 1998-09-15 | 2000-03-22 | 盐城市电子设备厂 | Overhead specially-shaped coil for magnetic-powder flaw detector |
| CN1715906A (en) * | 2004-06-29 | 2006-01-04 | 倪卫华 | Train hook magnetic powder defect detector |
| CN101915803A (en) * | 2009-11-22 | 2010-12-15 | 王枫 | Non-contact magnetic powder inspection device for three-dimensional rotating magnetic field |
| CN202372476U (en) * | 2011-11-10 | 2012-08-08 | 江苏赛福探伤设备制造有限公司 | Fluorescent magnetic powder flaw detector for crossed rods |
| CN203148894U (en) * | 2013-04-02 | 2013-08-21 | 盐城东车科技有限公司 | Magnetic-powder flaw-detecting machine of wheel-pair type workpiece |
| CN203350227U (en) * | 2013-05-31 | 2013-12-18 | 中国一拖集团有限公司 | AC (alternating current)-DC (direct current) longitudinal closed circuit magnetizing flaw detector |
| CN207281004U (en) * | 2017-09-26 | 2018-04-27 | 王枫 | Special-shaped coils wheel is to magnetic powder inspection device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111912898A (en) * | 2020-07-21 | 2020-11-10 | 杭州兴发弹簧有限公司 | Double-mode magnetic powder flaw detection device with energized and energized spiral compression spring |
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