CN202886336U - Electromagnetic ultrasonic transducer and online flaw detection system comprising same - Google Patents
Electromagnetic ultrasonic transducer and online flaw detection system comprising same Download PDFInfo
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- CN202886336U CN202886336U CN 201220464118 CN201220464118U CN202886336U CN 202886336 U CN202886336 U CN 202886336U CN 201220464118 CN201220464118 CN 201220464118 CN 201220464118 U CN201220464118 U CN 201220464118U CN 202886336 U CN202886336 U CN 202886336U
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- 238000001514 detection method Methods 0.000 title claims abstract description 74
- 238000005096 rolling process Methods 0.000 claims description 21
- 238000007689 inspection Methods 0.000 claims description 8
- 238000002604 ultrasonography Methods 0.000 claims description 3
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- 230000003139 buffering effect Effects 0.000 description 13
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- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
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- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model provides an electromagnetic ultrasonic transducer and an online flaw detection system comprising the same, wherein the electromagnetic ultrasonic transducer is provided with a detection bottom surface, a limit member is connected to the side wall of the electromagnetic ultrasonic transducer and is arranged towards the detection bottom surface in an extending manner, the bottom surface of the limit member is lower than the detection bottom surface, the distance d between the bottom surface of the limit member and the detection bottom surface is more than 0mm and is not more than 1mm, and the bottom surface of the limit member is in contact with the surface of a detected object in the working state of the electromagnetic ultrasonic transducer. According to the electromagnetic ultrasonic transducer, the limit member arranged on the electromagnetic ultrasonic transducer is used for limiting the distance between the detection bottom surface of the electromagnetic ultrasonic transducer and the detected object, the detection signal to noise ratio of the electromagnetic ultrasonic transducer is ensured, the flaw detection precision is improved, the collision between the detection bottom surface of the electromagnetic ultrasonic transducer and the surface of the detected object is prevented, and the damage to the detection bottom surface due to collision is prevented.
Description
Technical Field
The utility model relates to a nondestructive inspection technical field particularly, relates to an electromagnetic ultrasonic transducer and including the online flaw detection system of this transducer.
Background
In the field of nondestructive inspection, piezoelectric ultrasound and electromagnetic ultrasound are commonly used for detecting the defects of layering, shrinkage porosity, holes, inclusions, bubbles, internal cracks and the like of metal materials such as steel plates so as to meet the increasing market demands on high-quality steel such as ship plate steel, high-pressure vessel steel and the like. The piezoelectric ultrasonic flaw detection device is gradually replaced by an electromagnetic ultrasonic flaw detection device in the use process due to the problems that the temperature range of a flaw detection steel plate is narrow, a large amount of coupling purified water or other coupling agents are consumed, misjudgment is easily caused by interference and the like. The electromagnetic ultrasonic flaw detection device does not use a coupling agent, does not need to be in contact with a detected object, can directly detect moving objects and objects with rough surfaces, rusty scales and paint layers without interference, and has high detection precision.
RU2298180 discloses the on-line detection of defects of a steel plate by using a plurality of electromagnetic ultrasonic transducers, each of which has an independent and vertically moving cylinder to drive the electromagnetic ultrasonic transducer to vertically lift, and by using this structure, the electromagnetic ultrasonic transducers can be selectively put into operation or not put into operation to meet the requirements of different steel plate sizes or different detection areas. WO2007/013836a1 discloses that compressed air passes through an electromagnetic ultrasonic transducer to form an air cushion between the electromagnetic ultrasonic transducer and a detected steel plate, when the steel plate bounces upwards, the distance between the electromagnetic ultrasonic transducer and the steel plate is shortened, the air cushion layer is reduced, the pressure is increased, and the electromagnetic ultrasonic transducer is driven to automatically follow the steel plate to rise. In the use process of the structure, at the moment when the electromagnetic ultrasonic transducer reaches the working position from the waiting position, the electromagnetic ultrasonic transducer collides with the steel plate to easily cause abrasion of the detection surface, in addition, the flow rate of the compressed air is reduced due to partial blockage of a compressed air pipeline or other reasons by the compressed air for forming an air cushion, the pressure is insufficient, and the electromagnetic ultrasonic transducer is unbalanced to contact with the steel plate and abrade the detection bottom surface. Moreover, the above system requires a bulky gas supply system, which is very complicated in structure.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an electromagnetic ultrasonic transducer reaches online flaw detection system including this transducer to survey the technical problem that the bottom surface easily collides and wearing and tearing with the quilt detection thing among the solution prior art.
In order to achieve the above object, according to the utility model discloses an aspect provides an electromagnetic ultrasonic transducer, has the detection bottom surface, is connected with the locating part on electromagnetic ultrasonic transducer's the lateral wall, and the locating part orientation is surveyed the bottom surface and is set up with extending, and the bottom surface of locating part is less than and surveys the bottom surface, and the bottom surface of locating part is for 0mm < d ≦ 1mm with the scope of surveying the distance d of bottom surface, the bottom surface of locating part under electromagnetic ultrasonic transducer's operating condition with the surface contact who is surveyed the thing.
Further, the limiting members are respectively provided in plurality on the corresponding side walls of the electromagnetic ultrasonic transducer.
Further, the limiting member comprises a tracking wheel, the bottom surface of the tracking wheel is the bottom surface of the limiting member, and the rotation axis of the tracking wheel is parallel to the detection bottom surface.
Furthermore, the range of the distance d between the bottom surface of the limiting part and the detection bottom surface is more than or equal to 0.2mm and less than or equal to 0.6 mm.
According to the utility model discloses an on the other hand provides an online flaw detection system, including electromagnetic ultrasonic transducer, the operating system that control electromagnetic ultrasonic transducer goes up and down, control electromagnetic ultrasonic transducer carry out the signal generation and the processing system of the operation of detecting a flaw, electromagnetic ultrasonic transducer is according to preceding electromagnetic ultrasonic transducer.
Further, the electromagnetic ultrasonic transducer damping device further comprises a buffering device, the buffering device comprises a buffering arm, a rolling wheel, a first elastic buffering part and a buffering arm connecting assembly used for being connected with the buffering arm, one end of the buffering arm is hinged to the side wall of the electromagnetic ultrasonic transducer, the rolling wheel can be arranged at the other end of the buffering arm in a rolling mode, the bottom surface of the rolling wheel is lower than the bottom surface of the buffering arm, a rotating central shaft of the rolling wheel is parallel to the side wall, hinged to the buffering arm, of the electromagnetic ultrasonic transducer, the first elastic buffering part is connected between the buffering arm and the buffering arm connecting assembly, the bottom surface of the rolling wheel is in a state that the position of the rolling wheel is lower than the bottom surface of the limiting part under the non-working state of the electromagnetic ultrasonic transducer.
Further, the lifting system comprises a rack, a lifting system connecting assembly hinged to the rack, a driving device with one end connected with the lifting system connecting assembly and the other end fixed on the rack, and a chain connected with the electromagnetic ultrasonic transducer and the lifting system connecting assembly, wherein the driving device drives the electromagnetic ultrasonic transducer to lift.
Furthermore, a second elastic buffer piece which is horizontally arranged is connected between one end of the side wall of the electromagnetic ultrasonic transducer, which is far away from the detection bottom surface, and the side surface of the buffer arm connecting assembly, which is close to the electromagnetic ultrasonic transducer.
Further, the first and/or second elastic buffer is a spring.
Further, a balance elastic piece parallel to the driving direction of the driving device is arranged between the frame and the electromagnetic ultrasonic transducer.
The utility model discloses an electromagnetic ultrasonic transducer reaches online flaw detection system including this transducer, through connect the locating part that the orientation was surveyed the bottom surface and is extended on electromagnetic ultrasonic transducer's lateral wall, and make the bottom surface of locating part be less than and survey the bottom surface, adopt this kind of structure when electromagnetic ultrasonic transducer descends to when being surveyed the object surface, the bottom surface of locating part with by surveying object surface contact and support on being surveyed the object, the detection bottom surface that has limited electromagnetic ultrasonic transducer and the distance between being surveyed the object, electromagnetic ultrasonic transducer's detection SNR has been ensured, the flaw detection precision has been improved, the detection bottom surface that has prevented electromagnetic ultrasonic transducer simultaneously and the collision on being surveyed the object surface, the harm to surveying the bottom surface that has caused because of the collision has been prevented.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a partial structure of an online inspection system according to an embodiment of the present invention in a non-operating state;
FIG. 2a is a schematic diagram illustrating a partial structure of the on-line inspection system shown in FIG. 1 in an operating state; and
fig. 2b shows a schematic structural view in the range indicated as a in fig. 2 a.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
As shown in fig. 1 to 2b, the electromagnetic ultrasonic transducer 10 according to the embodiment of the present invention has a detection bottom surface 12, a limiting member 11 is connected to a side wall of the electromagnetic ultrasonic transducer 10, the limiting member 11 is disposed extending toward the detection bottom surface 12, the bottom surface of the limiting member 11 is lower than the detection bottom surface 12, the bottom surface of the limiting member 11 has a smooth surface to reduce wear to the detected object 40, and the range of the distance d between the bottom surface of the limiting member 11 and the detection bottom surface 12 is 0mm < d ≦ 1 mm. Preferably, d is 0.2 mm-0.6 mm. Preferably, the stoppers 11 are provided one on each of the respective sidewalls of the electromagnetic ultrasonic transducer 10, or only one pair on each of the opposing pair of sidewalls. Optionally, the distance of the limiting member 11 in the direction of the movement of the detected object 40 is smaller than the minimum bending radius of the detected object, so as to prevent the detected object 40 from scratching the detection bottom surface 12 and damaging the electromagnetic ultrasonic transducer 10 when the detected object 40 undulates unevenly. Preferably, the limiting member 11 comprises a tracking wheel, the bottom surface of the tracking wheel is the bottom surface of the limiting member 11, and the rotation central axis of the tracking wheel is arranged parallel to the detection bottom surface 12. The object to be detected 40 is metal.
According to the electromagnetic ultrasonic transducer 10 of the embodiment, the limiting piece 11 extending towards the detection bottom surface 12 is connected to the side wall of the electromagnetic ultrasonic transducer 10, and the limiting piece 11 is lower than the detection bottom surface 12, when the electromagnetic ultrasonic transducer 10 descends to the surface of the detected object 40, the bottom surface of the limiting piece 11 contacts with the surface of the detected object 40 and is supported on the detected object 40, so that the distance between the detection bottom surface 12 of the electromagnetic ultrasonic transducer 10 and the detected object 40 is limited, the detection signal-to-noise ratio of the electromagnetic ultrasonic transducer 10 is ensured, the flaw detection precision is improved, meanwhile, the collision between the detection bottom surface 12 of the electromagnetic ultrasonic transducer 10 and the surface of the detected object 40 is also prevented, and the damage to the detection bottom surface 12 caused by the collision is prevented.
The embodiment of the utility model provides an online flaw detection system is still provided, including the operating system of electromagnetic ultrasonic transducer 10, the lift of control electromagnetic ultrasonic transducer 10, control electromagnetic ultrasonic transducer 10 carry out the signal emergence and the processing system of the operation of detecting a flaw, wherein, electromagnetic ultrasonic transducer 10 is foretell electromagnetic ultrasonic transducer 10.
In one embodiment, the lift system comprises a frame 30, a lift system connecting assembly 52 hinged to the frame 30, a driving device 60 having one end connected to the lift system connecting assembly 52 and the other end fixed to the frame 30, and a chain connecting the electromagnetic ultrasonic transducer 10 and the lift system connecting assembly 52, wherein the driving device 60 is preferably a pneumatic cylinder. The lower ends of the two chains are hinged to the upper end face of the electromagnetic ultrasonic transducer 10, and the side wall of the electromagnetic ultrasonic transducer 10, which is far away from the cylinder, is hinged to the lower end of the buffer arm connecting assembly 51. Preferably, a balance elastic member 70, such as a spring, is disposed between the frame 30 and the electromagnetic ultrasonic transducer 10 in parallel with the driving direction of the driving device 60.
In the online flaw detection system of the embodiment, when the cylinder 60 is in the initial state, the chain is in a tensioned state to bear the weight of the electromagnetic ultrasonic transducer 10, when the detection work is to be performed, the cylinder is started, the piston of the cylinder extends to push the piston connecting piece to move downwards, at this time, the electromagnetic ultrasonic transducer 10 descends towards the detected object 40 along with the gravity of the electromagnetic ultrasonic transducer, and the tracking wheel contacts the surface of the detected object 40 when the electromagnetic ultrasonic transducer 10 falls on the detected object 40, so that the collision between the detection bottom surface 12 and the detected object 40 is avoided, and the damage of the detection bottom surface 12 caused by the collision is prevented.
In order to further protect the detecting bottom surface 12 of the electromagnetic ultrasonic transducer 10, the present embodiment further includes a buffer device, the buffer device includes a buffer arm 20, a rolling wheel 21, a first elastic buffer 22 and a buffer arm connecting assembly 51 for connecting the buffer arm 20, one end of the buffer arm 20 is hinged on a side wall of the electromagnetic ultrasonic transducer 10, the rolling wheel 21 is rollably disposed at the other end of the buffer arm 20, a bottom surface of the rolling wheel 21 is lower than the bottom surface of the buffer arm 20, a rotation central axis of the rolling wheel 21 is parallel to the side wall of the electromagnetic ultrasonic transducer 10 hinged with the buffer arm 20, the first elastic buffer 22 is connected between the buffer arm 20 and the buffer arm connecting assembly 51, the first elastic buffer 22 exerts a downward force on the buffer arm 20 during the rotation of the buffer arm 20, preferably, the first elastic buffer 22 is vertically disposed, wherein the bottom surface of the rolling wheel 21 has a state lower than the bottom surface of the limiting member 11 under the non-operating state of the electromagnetic ultrasonic transducer 10 And a state where the position is equal to the bottom surface of the limiting member 11 in the operating state of the electromagnetic ultrasonic transducer 10. Preferably, the buffer arm 20 includes two first segments and two second segments disposed opposite to each other, opposite ends of the first segments and the second segments are respectively hinged to the side walls of the electromagnetic ultrasonic transducer 10, the other ends of the first segments and the second segments are connected to a third segment disposed parallel to the side walls of the electromagnetic ultrasonic transducer 10, and the rolling wheel 21 is pivoted on the third segment. Preferably, the first resilient buffer 22 is a spring.
By adopting the online flaw detection system of the embodiment, the detected object 40 moves at a certain speed, the cylinder is started, the electromagnetic ultrasonic transducer 10 moves towards the detected object 40, the buffer arm connecting assembly 51, the buffer arm 20 and the rolling wheel 21 are driven to move together, because one end of the buffer arm 20 far away from the electromagnetic ultrasonic transducer 10 is lower than the detection bottom surface 12 in a non-working state, the bottom surface of the rolling wheel 21 is lower than the bottom surface of the buffer arm 20, when the online flaw detection system descends, the rolling wheel 21 firstly contacts the surface of the detected object 40, and drives the buffer arm 20 to rotate relative to the electromagnetic ultrasonic transducer 10 through the hinging action with the electromagnetic ultrasonic transducer 10, so that the displacement of the buffer arm 20 on the surface of the detected object 40 is generated until the bottom surface of the limiting part 11 contacts the surface of the detected object 40, the descending impact force of the electromagnetic ultrasonic transducer 10 is reduced, and the service life of the tracking wheel is prolonged, further preventing the detection of a collision of the bottom surface 12. The buffer arm 20 presses the first elastic buffer 22 in the moving process of the surface of the detected object 40, and the elastic action of the first elastic buffer 22 slows down the relative rotation speed between the buffer arm 20 and the electromagnetic ultrasonic transducer 10, so as to further slow down the descending speed of the electromagnetic ultrasonic transducer 10; when the cylinder-driven electromagnetic ultrasonic transducer 10 moves upward after the detection is completed, the buffer arm 20 rotates under the action of the first elastic buffer 22, and the end moves to the position below the detection bottom surface 12 to return to the initial state.
In order to prevent the electromagnetic ultrasonic transducer 10 from rotating along the axis hinged to the buffer arm connecting assembly 51 when the tracking wheels of the electromagnetic ultrasonic transducer 10 all contact the detected object 40, and ensure that the bottom of the electromagnetic ultrasonic transducer 10 is parallel to the detected object 40, a second elastic buffer 23, such as a spring, is connected between one end of the side wall of the electromagnetic ultrasonic transducer 10 away from the detection bottom surface 12 and one side surface of the buffer arm connecting assembly 51 close to the electromagnetic ultrasonic transducer 10.
From the above description, it can be seen that, the electromagnetic ultrasonic transducer 10 and the online flaw detection system including the same of the present invention connect the limiting member 11 extending toward the detection bottom surface 12 on the side wall of the electromagnetic ultrasonic transducer 10, and make the bottom surface of the limiting member 11 lower than the detection bottom surface 12, when the electromagnetic ultrasonic transducer 10 descends to the surface of the detected object 40, the bottom surface of the limiting member 11 contacts and supports the detected object 40, so as to prevent the collision between the detection bottom surface 12 of the electromagnetic ultrasonic transducer 10 and the detected object 40, and prevent the damage to the detection bottom surface 12 caused by the collision.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The electromagnetic ultrasonic transducer is provided with a detection bottom surface (12), and is characterized in that a limiting piece (11) is connected to a side wall of the electromagnetic ultrasonic transducer (10), the limiting piece (11) is arranged in a manner of extending towards the detection bottom surface (12), the bottom surface of the limiting piece (11) is lower than the detection bottom surface (12), the range of the distance d between the bottom surface of the limiting piece (11) and the detection bottom surface (12) is 0mm < d < 1mm, and the bottom surface of the limiting piece (11) is in contact with the surface of an object to be detected (40) in the working state of the electromagnetic ultrasonic transducer (10).
2. The electromagnetic ultrasonic transducer according to claim 1, wherein said retaining member (11) is provided in plurality on respective side walls of said electromagnetic ultrasonic transducer (10).
3. The electromagnetic ultrasonic transducer according to claim 1, wherein said limit piece (11) comprises a tracking wheel, the bottom surface of which is the bottom surface of said limit piece (11), the axis of rotation of which is parallel to said detection bottom surface (12).
4. The electromagnetic ultrasound transducer according to any of claims 1 to 3, characterized in that the distance d of the bottom surface of the limit piece (11) from the detection bottom surface (12) ranges from 0.2mm ≦ d ≦ 0.6 mm.
5. An online flaw detection system comprising an electromagnetic ultrasonic transducer (10), a lifting system for controlling the lifting of the electromagnetic ultrasonic transducer (10), and a signal generating and processing system for controlling the electromagnetic ultrasonic transducer (10) to perform flaw detection operations, wherein the electromagnetic ultrasonic transducer (10) is the electromagnetic ultrasonic transducer (10) according to any one of claims 1 to 4.
6. The online flaw detection system according to claim 5, further comprising a buffer device including a buffer arm (20), a rolling wheel (21), a first elastic buffer member (22), and a buffer arm connection assembly (51) for connecting the buffer arm (20), wherein one end of the buffer arm (20) is hinged to a sidewall of the electromagnetic ultrasonic transducer (10), the rolling wheel (21) is rollably disposed at the other end of the buffer arm (20), a bottom surface of the rolling wheel (21) is lower than a bottom surface of the buffer arm (20), a rotation center axis of the rolling wheel (21) is parallel to the sidewall of the electromagnetic ultrasonic transducer (10) hinged to the buffer arm (20), and the first elastic buffer member (22) is connected between the buffer arm (20) and the buffer arm connection assembly (51), wherein,
the bottom surface of the rolling wheel (21) has a state that the position is lower than the bottom surface of the limiting part (11) in the non-working state of the electromagnetic ultrasonic transducer (10), and the position is equal to the bottom surface of the limiting part (11) in the working state of the electromagnetic ultrasonic transducer (10).
7. The on-line inspection system of claim 6, wherein the lifting system comprises a machine frame (30), a lifting system connecting assembly (52) hinged on the machine frame (30), a driving device (60) with one end connected with the lifting system connecting assembly (52) and the other end fixed on the machine frame, and a chain connecting the electromagnetic ultrasonic transducer (10) and the lifting system connecting assembly (52), wherein the driving device (60) drives the electromagnetic ultrasonic transducer (10) to lift.
8. The online inspection system of claim 6, characterized in that a second horizontally arranged elastic buffer (23) is connected between one end of the side wall of the electromagnetic ultrasonic transducer (10) far away from the detection bottom surface (12) and one side surface of the buffer arm connecting assembly (51) close to the electromagnetic ultrasonic transducer (10).
9. The online inspection system of claim 8, characterized in that the first elastomeric buffer (22) and/or the second elastomeric buffer (23) is a spring.
10. The online inspection system according to claim 7, characterized in that a balance elastic member (70) parallel to the driving direction of the driving device is provided between the rack (30) and the electromagnetic ultrasonic transducer (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220464118 CN202886336U (en) | 2012-09-12 | 2012-09-12 | Electromagnetic ultrasonic transducer and online flaw detection system comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220464118 CN202886336U (en) | 2012-09-12 | 2012-09-12 | Electromagnetic ultrasonic transducer and online flaw detection system comprising same |
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| Publication Number | Publication Date |
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| CN202886336U true CN202886336U (en) | 2013-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220464118 Expired - Lifetime CN202886336U (en) | 2012-09-12 | 2012-09-12 | Electromagnetic ultrasonic transducer and online flaw detection system comprising same |
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| CN (1) | CN202886336U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866205A (en) * | 2012-09-12 | 2013-01-09 | 田志恒 | Electromagnetic ultrasonic transducer and online flaw detection system with same |
| CN107607626A (en) * | 2017-09-13 | 2018-01-19 | 中国石油天然气集团公司管材研究所 | Electromagnet ultrasonic changer and the equipment with electromagnet ultrasonic changer automatic detection steel plate |
-
2012
- 2012-09-12 CN CN 201220464118 patent/CN202886336U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866205A (en) * | 2012-09-12 | 2013-01-09 | 田志恒 | Electromagnetic ultrasonic transducer and online flaw detection system with same |
| WO2014040543A1 (en) * | 2012-09-12 | 2014-03-20 | 田立 | Electromagnetic ultrasonic transducer and on-line inspection system comprising same |
| CN102866205B (en) * | 2012-09-12 | 2015-07-15 | 田志恒 | Electromagnetic ultrasonic transducer and online flaw detection system with same |
| US9804131B2 (en) | 2012-09-12 | 2017-10-31 | Zhiheng Tian | Electromagnetic ultrasonic transducer and on-line inspection system comprising same |
| CN107607626A (en) * | 2017-09-13 | 2018-01-19 | 中国石油天然气集团公司管材研究所 | Electromagnet ultrasonic changer and the equipment with electromagnet ultrasonic changer automatic detection steel plate |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20130417 Effective date of abandoning: 20150715 |
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| RGAV | Abandon patent right to avoid regrant |