CN102954774B - Electromagnetic ultrasonic measuring device for wall thickness of steel tube based on magnetic focusing bridge circuit - Google Patents
Electromagnetic ultrasonic measuring device for wall thickness of steel tube based on magnetic focusing bridge circuit Download PDFInfo
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- CN102954774B CN102954774B CN201210416917.0A CN201210416917A CN102954774B CN 102954774 B CN102954774 B CN 102954774B CN 201210416917 A CN201210416917 A CN 201210416917A CN 102954774 B CN102954774 B CN 102954774B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 128
- 239000010959 steel Substances 0.000 title claims abstract description 128
- 238000005259 measurement Methods 0.000 claims description 39
- 238000012360 testing method Methods 0.000 claims description 30
- 230000007246 mechanism Effects 0.000 claims description 25
- 239000000919 ceramic Substances 0.000 claims description 14
- 238000009826 distribution Methods 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000002604 ultrasonography Methods 0.000 claims description 6
- 230000001939 inductive effect Effects 0.000 claims description 5
- 230000005284 excitation Effects 0.000 claims description 4
- 241000276425 Xiphophorus maculatus Species 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 230000035699 permeability Effects 0.000 description 4
- 239000000523 sample Substances 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 241000826860 Trapezium Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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Abstract
The invention discloses an electromagnetic ultrasonic measuring device for wall thickness of a steel tube based on a magnetic focusing bridge circuit. The electromagnetic ultrasonic measuring device comprises a through magnetizing coil, magnetic elements, magnetic focusing elements and an electromagnetic ultrasonic detection coil, wherein the magnetizing coil is used to arrange the steel tube to be detected concentrically therein so as to generate a magnetic field distributed in an axial direction after electrification. The magnetic elements are symmetrically arranged outside the magnetizing coil in a plate structure so that the generated magnetic field is distributed in the normal direction of the steel tube. The magnetic focusing elements are respectively arranged on the magnetic elements, and the lower ends of the magnetic focusing elements are close to the outer surface of the steel tube to be detected and maintain a gap. The electromagnetic ultrasonic detection coil is installed in the gap for measuring the wall thickness of the steel tube when a high frequency current is introduced. The invention further discloses other structure types. According to the electromagnetic ultrasonic measuring device for wall thickness of the steel tube based on the magnetic focusing bridge circuit provided by the invention, the radial stable and constant strong magnetic field can be formed in a local position of the steel tube to be detected, and attraction to the steel tube is eliminated by symmetrical arrangement, so that the electromagnetic ultrasonic measuring device for wall thickness of the steel tube is in particular suitable for purposes such as online high speed thickness detection of steel tubes.
Description
Technical field
The invention belongs to electromagnetic ultrasonic thickness measuring technical field, more specifically, relate to a kind of thickness of steel pipe electromagnetic acoustic measurement mechanism based on poly-magnetic bridge road.
Background technology
One of important parameter that thickness of steel pipe Shi Ge pipe mill must detect in process of production.Traditional manual measurement method adopts calliper or portable supersonic thicknessmeter, and it exists the defects such as efficiency is low, cost of labor is high, error is large.For this reason, some research institutions start to adopt immersion type automatic ultrasonic thickness measuring mode both at home and abroad, but the use of couplant, measuring accuracy is not high and be difficult to apply to automatic measuring thickness and these factors of the real-time thickness measuring of high temperature, constrains the method widely using in thickness of steel pipe measuring process.
The electromagnetic ultrasonic thickness measuring mode that developed recently gets up does not need couplant, conveniently can realize Quick Measurement.The key link affecting electromagnetic ultrasonic thickness measuring probe performance is the normal direction magnetic field intensity that immediately below probe magnetic test coil, workpiece for measurement becomes in skin layers, the stronger echoed signal in this magnetic field is more stable, the reliability measured and precision higher.Adopt both at home and abroad permanent magnet to provide this magnetic field, because of not allowing easily broken magnetic, suction is large, probe quick abrasion always, and adsorbs a large amount of iron filings after work a period of time and be difficult to clear up, and therefore can affect measuring accuracy; On the other hand, because the magnetic force of permanent magnet is limited, providing of force-magnetized field is restricted.For above technical matters, a kind of impulse mgnet for electromagnet ultrasonic changer is disclosed in CN101706266A, impulse mgnet is wherein adopted to set up high-intensity magnetic field, but, it is still difficult to obtain stable signal in robotization continuous coverage, correspondingly directly have influence on measuring accuracy, especially under high speed measurement environment.Therefore, how the online fast automatic thickness measuring process of steel pipe is provided to the high-intensity magnetic field of steady, particularly important to the enforcement of electromagnetic ultrasonic thickness measuring principle.
Summary of the invention
For above defect and the technical need of prior art, the object of the present invention is to provide a kind of thickness of steel pipe electromagnetic acoustic measurement mechanism based on poly-magnetic bridge road, it forms radial steady strong magnetic field by the mode setting up magnetic bridge loop at the local location of steel pipe to be detected, and employing is arranged symmetrically with to eliminate the suction to steel pipe, multiple individual magnetic can be set up in circle direction thus, thus realize the ultrasonic thickness of steel pipe measurement function of array automatic electromagnetic.
According to a kind of structural form of the present invention, provide a kind of thickness of steel pipe electromagnetic acoustic measurement mechanism based on poly-magnetic bridge road, this measurement mechanism comprises through mode magnetizing coil, magnetic conductive component, poly-magnetic cell and electromagnetic acoustic magnetic test coil, wherein:
Described through mode magnetizing coil is used for steel pipe to be detected to arrange with one heart wherein, produces the magnetic field along its axial distribution thus after passing to direct current to steel pipe;
Described magnetic conductive component is the outside that platy structure is arranged on described through mode magnetizing coil, and the change direction, magnetic field produced for making this magnetizing coil distributes along the normal direction of steel pipe to be detected;
Described poly-magnetic cell is that arm structure is symmetricly set on magnetic conductive component described in each respectively, its lower end is pressed close to the outside surface of steel pipe to be detected and is kept gap, form closed magnetic bridge loop together with steel pipe thus, and formed along the radially-arranged gathering magnetic field of steel pipe between this lower end surface and outer surface of steel tube;
Described electromagnetic acoustic magnetic test coil is arranged in the described gap between poly-magnetic cell lower end and outer surface of steel tube, produce inductive loop for the skin layers that becomes when passing to high-frequency current at steel pipe to be detected and assembling excitation ultrasound ripple under magnetic field environment, perform the measurement to thickness of steel pipe thus.
By above design, stronger steady magnetic field is set up fast owing to adopting DC magnetization mode, and the magnetic conductive component utilizing high permeability material to make and poly-magnetic cell are to build closed magnetic bridge loop, can collect the partial magnetic field that is distributed in air like this and it be gathered further steel pipe top layer is formed based on the steady strong magnetic field on vertical steel tube surface, the measuring accuracy thus under guarantee high speed measurement environment; In addition, by being arranged symmetrically with magnetic bridge loop, the suction treating examination steel tube can be eliminated, thus contribute to improving the accuracy measured further.
According to another structural form of the present invention, provide a kind of thickness of steel pipe electromagnetic acoustic measurement mechanism based on poly-magnetic bridge road, this measurement mechanism comprises through mode magnetizing coil, magnetic conductive component, poly-magnetic cell and electromagnetic acoustic magnetic test coil, wherein:
Described through mode magnetizing coil is used for steel pipe to be detected to arrange with one heart wherein, produces the magnetic field along its axial distribution thus after passing to direct current to steel pipe;
Described magnetic conductive component be tubular structure by wherein sheathed for described through mode magnetizing coil, the change direction, magnetic field produced for making this magnetizing coil distributes along the normal direction of steel pipe to be detected;
Described poly-magnetic cell is arm structure and circumference along described magnetic conductive component is symmetricly set on magnetic conductive component respectively, its lower end is pressed close to the outside surface of steel pipe to be detected and is kept gap, form closed magnetic bridge loop together with steel pipe thus, and formed along the radially-arranged gathering magnetic field of steel pipe between this lower end surface and outer surface of steel tube;
Described electromagnetic acoustic magnetic test coil is arranged in the described gap between poly-magnetic cell lower end and outer surface of steel tube, produce inductive loop for the skin layers that becomes when passing to high-frequency current at steel pipe to be detected and assembling excitation ultrasound ripple under magnetic field environment, perform the measurement to thickness of steel pipe thus.
By above design, stronger steady magnetic field is set up fast owing to adopting DC magnetization mode, and the magnetic conductive component utilizing high permeability material to make and poly-magnetic cell are to build closed magnetic bridge loop, can be formed on steel pipe top layer based on the steady strong magnetic field on vertical steel tube surface like this, ensure the measuring accuracy under high speed measurement environment thus; In addition, by being arranged symmetrically with multiple magnetic bridge loop along the circumferential direction of steel pipe to be detected, be convenient to realization all-round to setting up multiple independent high-intensity magnetic field at steel pipe, thus strengthen the operation ease of thickness of steel pipe measurement, and contribute to reducing error, improve the accuracy measured.
Preferably, the external diameter of described magnetic conductive component is 1.1-1.2 times of the external diameter of described through mode magnetizing coil, and its thickness is 20 ~ 40mm.
By making above restriction to the structural parameters such as diameter and thickness of magnetic conductive component, more contrast test shows, it can guarantee not to be magnetized in the measuring process of thickness of steel pipe saturated, correspondingly, can effectively avoid disconnected magnetic phenomenon, and improve the accuracy of the online fast automatic thickness measuring of steel pipe.
Preferably, described poly-magnetic cell is the arm structure that upper end cross sectional is relatively large, lower end cross sectional area is relatively little, and the outside surface of steel pipe to be detected is pressed close in the relatively little lower end of its sectional area.
By the planform of poly-magnetic cell and set-up mode thereof are carried out above restriction, can by magnetizing coil produce and change the Distribution of Magnetic Field behind direction by magnetic conductive component and concentrate the region be gathered near electromagnetic acoustic magnetic test coil further, be convenient to thus improve magnetic field intensity, and contribute to strengthening ultrasound detection signal and improving the reliability detected.
Preferably, described poly-magnetic cell can radially direction regulate relative to steel pipe to be detected, is applicable to the steel pipe to be detected of different tube diameters thus.
Preferably, described magnetic conductive component and poly-magnetic cell are made by the high permeability material of for example electrician's iron.
Preferably, described electromagnetic acoustic magnetic test coil is provided with wear resistant ceramic chip, and is contacted by the surface of this wear resistant ceramic chip with steel pipe to be detected.
By being provided as the wear resistant ceramic chip of protective seam between electromagnetic acoustic magnetic test coil and steel pipe to be detected; can while guarantee electromagnetic acoustic testing process be carried out smoothly; in effective minimizing mobility detect process, due to the damage to magnetic test coil that contact friction possible between steel pipe and magnetic test coil causes.
Preferably, the thickness of described wear resistant ceramic chip is less than 0.3mm.
By carrying out above concrete restriction to the thickness of wear resistant ceramic chip, more experimental test shows, it can make the interval remaining relative constancy between magnetic test coil and steel pipe to be detected, and this interval is unlikely and causes decay to signal, thus has influence on measuring accuracy.
In general, according to the thickness of steel pipe electromagnetic acoustic measurement mechanism based on poly-magnetic bridge road of the present invention compared with prior art, following technological merit is mainly possessed:
1, by setting up the mode in magnetic bridge loop, the steady strong magnetic field mainly radially distributed can be formed in steel pipe partial position to be detected, ensureing the reliability to thickness of steel pipe measurement and precision; In addition, by adopting the poly-magnetic cell of symmetrical expression distribution, can effectively eliminating the suction treating examination steel tube, realizing at steel pipe all-round to setting up multiple independent high-intensity magnetic field, thus improving the stability measured further;
2, by the further optimum choice of the structure to magnetic conductive component, poly-magnetic cell and electromagnetic acoustic measuring coil, material and size aspect, Distribution of Magnetic Field can be made to concentrate the region be gathered near electromagnetic acoustic magnetic test coil further, strengthen ultrasound detection signal thus and improve the reliability detected; In addition, the damage to measuring coil in measuring process can be avoided, improve the serviceable life of device;
3, according to measurement mechanism compact overall structure of the present invention, convenient operation, and possess the high feature of precision, be thus particularly useful for the purposes such as High-speed Steel Tube thickness measuring and on-line automatic thickness measuring.
Accompanying drawing explanation
Fig. 1 is the structural representation of the thickness of steel pipe electromagnetic acoustic measurement mechanism according to a kind of structural form of the present invention;
Fig. 2 is the structural representation of the thickness of steel pipe electromagnetic acoustic measurement mechanism according to another structural form of the present invention;
Fig. 3 is the structural representation of the electromagnetic acoustic magnetic test coil possessing wear resistant ceramic chip according to the present invention.
In all of the figs, identical Reference numeral is used for representing identical element or structure, wherein:
1-through mode magnetizing coil 2-magnetic conductive component 3-gathers the magnetic cell 4-electromagnetic acoustic magnetic test coil 5-wear resistant ceramic chip 6-steel pipe 7-to be detected magnetic line of force
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
Fig. 1 is the structural representation of the thickness of steel pipe electromagnetic acoustic measurement mechanism according to a kind of structural form of the present invention.As shown in fig. 1, through mode magnetizing coil 1, magnetic conductive component 2, poly-magnetic cell 3 and electromagnetic acoustic magnetic test coil 4 is mainly comprised according to thickness of steel pipe electromagnetic acoustic measurement mechanism of the present invention.Through mode magnetizing coil 1 and steel pipe 6 to be detected are arranged and steel pipe is wherein sheathed with one heart, when passing to direct current to the comparatively high-intensity magnetic field of steel pipe generation along its axial distribution.Because magnetic field is always gathered on the minimum path of magnetic resistance, therefore can consider by arranging magnetic conductive component 2 and poly-magnetic cell 3 forms closed magnetic bridge loop jointly.In the present embodiment, magnetic conductive component 2 is symmetricly set on two outsides of through mode magnetizing coil 1 in platy structure, the change direction, magnetic field produced for making this magnetizing coil distributes with the normal direction along steel pipe 6 to be detected; Poly-magnetic cell 3 is for example separately positioned on each magnetic conductive component 2 in the arm structure that upper end cross sectional is large, lower end cross sectional area is little, and its lower end is pressed close to the outside surface of steel pipe 6 to be detected and kept such as being not less than the gap of 3mm.Like this, the magnetic field be distributed in surrounding air can be collected by the magnetic conductive component 2 be made up of high permeability material and poly-magnetic cell 3, and form the magnetic bridge loop closed as shown in Figure 1 together with steel pipe, and formed between poly-magnetic cell lower end surface and outer surface of steel tube and assemble steady strong magnetic field along the radially-arranged normal direction of steel pipe.
Electromagnetic acoustic magnetic test coil 4 is arranged in the gap between the lower end of poly-magnetic cell 3 and steel pipe to be detected 6 outside surface, and the steady strong magnetic field at this place is utilized when passing to high-frequency current, produce inductive loop in the skin layers that becomes of steel pipe 6 to be detected and excite shearing shear wave under gathering magnetic field environment, realizing the electromagnetic acoustic measurement function to thickness of steel pipe thus.
Fig. 2 is the structural representation of the thickness of steel pipe electromagnetic acoustic measurement mechanism according to another structural form of the present invention.Key distinction part in structure shown in Fig. 2 and Fig. 1 is: magnetic conductive component 2 in tubular structure by wherein sheathed for through mode magnetizing coil 1, correspondingly, the poly-magnetic cell 3 of multiple arm structure is symmetrical on it respectively along the circumferential direction of this magnetic conductive component 2, and its lower end is pressed close to the outside surface of steel pipe 6 to be detected and kept gap.By above structure, multiple magnetic bridge loop can be arranged symmetrically with along the circumferencial direction of steel pipe to be detected, be convenient to realize eliminate suction to steel pipe to setting up multiple independent high-intensity magnetic field steel pipe is all-round simultaneously, thus contribute to improving the stability measured further, and operation ease when strengthening actual measurement.
As shown in greater detail in figure 2, according to the requirement of the aspects such as the external diameter size of steel pipe 6 to be detected and detection speed, poly-magnetic cell 3 can radially direction regulate relative to steel pipe to be detected, is applicable to the steel pipe to be detected of different tube diameters thus.In addition, the cross-section structure of poly-magnetic cell 3 is the similar trapezium structure that relatively large, the other end cross-sectional area of an end cross-sectional area is relatively little, and one end that sectional area is relatively little is close to the outside surface of steel pipe 6 to be detected, thus magnetic field can be gathered in better the reach of electromagnetic acoustic magnetic test coil 4.
In a preferred embodiment, the external diameter of magnetic conductive component 2 can be set as the 1.1-1.2 of through mode magnetizing coil 1 external diameter doubly, and its thickness is 20 ~ 40mm.This physical dimension can be guaranteed not to be magnetized in the measuring process of thickness of steel pipe saturated, correspondingly, can effectively avoid disconnected magnetic phenomenon, and improve the accuracy of the online fast automatic thickness measuring of steel pipe.In another preferred embodiment, electromagnetic acoustic magnetic test coil 4 is also provided with the wear resistant ceramic chip 5 that thickness is less than 0.3mm, and contacts servo-actuated by this wear resistant ceramic chip 5 with the outside surface of steel pipe 6 to be detected.Like this while avoiding signal attenuation, ensureing that electromagnetic acoustic testing process is carried out smoothly, effectively reduce the damage to magnetic test coil because contact friction possible between steel pipe and magnetic test coil causes.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the thickness of steel pipe electromagnetic acoustic measurement mechanism based on poly-magnetic bridge road, this measurement mechanism comprises through mode magnetizing coil (1), magnetic conductive component (2), poly-magnetic cell (3) and electromagnetic acoustic magnetic test coil (4), wherein:
Described through mode magnetizing coil (1), for being arranged wherein with one heart by steel pipe to be detected (6), produces the magnetic field along its axial distribution to steel pipe thus after passing to direct current;
Described magnetic conductive component (2) is arranged on the outside of described through mode magnetizing coil (1) in platy structure, the change direction, magnetic field produced for making this magnetizing coil distributes along the normal direction of steel pipe to be detected (6);
The arm structure that described poly-magnetic cell (3) is relatively large in upper end cross sectional, lower end cross sectional area is relatively little, these arm structures are symmetricly set on magnetic conductive component described in each (2) respectively, and the lower end that sectional area is relatively little is pressed close to the outside surface of steel pipe to be detected (6) and is kept gap, form closed magnetic bridge loop together with steel pipe thus, and formed along the radially-arranged gathering magnetic field of steel pipe between described lower end surface and outer surface of steel tube;
Described electromagnetic acoustic magnetic test coil (4) is arranged in the described gap between poly-magnetic cell lower end and outer surface of steel tube, produce inductive loop for the skin layers that becomes when passing to high-frequency current at steel pipe to be detected (6) and assembling excitation ultrasound ripple under magnetic field environment, perform the measurement to thickness of steel pipe thus.
2. thickness of steel pipe electromagnetic acoustic measurement mechanism as claimed in claim 1, is characterized in that, described poly-magnetic cell (3) can radially direction regulate relative to steel pipe to be detected, is applicable to the steel pipe to be detected of different tube diameters thus.
3. thickness of steel pipe electromagnetic acoustic measurement mechanism as claimed in claim 1 or 2, it is characterized in that, described magnetic conductive component (2) and poly-magnetic cell (3) are made with iron material by electrician.
4. thickness of steel pipe electromagnetic acoustic measurement mechanism as claimed in claim 1 or 2, it is characterized in that, described electromagnetic acoustic magnetic test coil (4) is also provided with wear resistant ceramic chip (5), and is contacted by the surface of this wear resistant ceramic chip with steel pipe to be detected (6).
5. the thickness of steel pipe electromagnetic acoustic measurement mechanism based on poly-magnetic bridge road, this measurement mechanism comprises through mode magnetizing coil (1), magnetic conductive component (2), poly-magnetic cell (3) and electromagnetic acoustic magnetic test coil (4), wherein:
Described through mode magnetizing coil (1), for being arranged wherein with one heart by steel pipe to be detected (6), produces the magnetic field along its axial distribution to steel pipe thus after passing to direct current;
Described magnetic conductive component (2) is in tubular structure by wherein sheathed for described through mode magnetizing coil (1), and the change direction, magnetic field produced for making this magnetizing coil distributes along the normal direction of steel pipe to be detected (6);
The arm structure that described poly-magnetic cell (3) is relatively large in upper end cross sectional, lower end cross sectional area is relatively little, these arm structures are symmetricly set on magnetic conductive component respectively along the circumference of described magnetic conductive component (2), and the lower end that sectional area is relatively little is pressed close to the outside surface of steel pipe to be detected (6) and is kept gap, form closed magnetic bridge loop together with steel pipe thus, and formed along the radially-arranged gathering magnetic field of steel pipe between described lower end surface and outer surface of steel tube;
Described electromagnetic acoustic magnetic test coil (4) is arranged in the described gap between poly-magnetic cell lower end and outer surface of steel tube, produce inductive loop for the skin layers that becomes when passing to high-frequency current at steel pipe to be detected (6) and assembling excitation ultrasound ripple under magnetic field environment, perform the measurement to thickness of steel pipe thus.
6. thickness of steel pipe electromagnetic acoustic measurement mechanism as claimed in claim 5, it is characterized in that, the external diameter of described magnetic conductive component (2) is 1.1 times ~ 1.2 times of the external diameter of described through mode magnetizing coil (1), and the thickness of magnetic conductive component (2) is 20mm ~ 40mm.
7. the thickness of steel pipe electromagnetic acoustic measurement mechanism as described in claim 5 or 6, is characterized in that, described poly-magnetic cell (3) can radially direction regulate relative to steel pipe to be detected, is applicable to the steel pipe to be detected of different tube diameters thus.
8. the thickness of steel pipe electromagnetic acoustic measurement mechanism as described in claim 5 or 6, it is characterized in that, described electromagnetic acoustic magnetic test coil (4) is also provided with wear resistant ceramic chip (5), and is contacted by the surface of this wear resistant ceramic chip with steel pipe to be detected (6).
9. thickness of steel pipe electromagnetic acoustic measurement mechanism as claimed in claim 8, it is characterized in that, the thickness of described wear resistant ceramic chip (5) is less than 0.3mm.
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| CN201210416917.0A CN102954774B (en) | 2012-10-26 | 2012-10-26 | Electromagnetic ultrasonic measuring device for wall thickness of steel tube based on magnetic focusing bridge circuit |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103630612A (en) * | 2013-12-13 | 2014-03-12 | 中电科信息产业有限公司 | Electromagnetic ultrasonic transducer |
| CN104880163A (en) * | 2015-06-03 | 2015-09-02 | 衡阳镭目科技有限责任公司 | Electromagnetic ultrasonic sensor and pipeline wall thickness detection system |
| CN105548352B (en) * | 2015-11-17 | 2018-02-06 | 苏州博昇科技有限公司 | A kind of electromagnetic acoustic wave transducer of no end check frequency |
| CN105973178B (en) * | 2016-05-26 | 2018-10-16 | 重庆钢铁(集团)有限责任公司 | A kind of preceding detection process method of steel pipe manufacture |
| CN107421474B (en) * | 2017-04-25 | 2023-06-02 | 武汉中科创新技术股份有限公司 | Electromagnetic ultrasonic thickness measuring probe for measuring thickness of workpiece |
| CN108015530A (en) * | 2017-12-14 | 2018-05-11 | 哈尔滨零声科技有限公司 | A kind of bolt pretightening loads automatically and control device |
| CN112414337A (en) * | 2020-12-01 | 2021-02-26 | 湖北工业大学 | Externally-penetrating annular array electromagnetic ultrasonic thickness measuring probe |
| CN114440805B (en) * | 2022-01-26 | 2024-01-02 | 武汉华宇一目检测装备有限公司 | Electromagnetic ultrasonic thickness measuring device and thickness measuring method for drill rod |
| CN116412746B (en) * | 2023-02-17 | 2024-05-14 | 宁波方力科技股份有限公司 | Online detection device, production line and detection method for wall thickness of plastic pipe |
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| EP0067065A1 (en) * | 1981-06-10 | 1982-12-15 | Hitachi, Ltd. | Electromagnetic-acoustic measuring apparatus |
| JPS63246655A (en) * | 1987-04-01 | 1988-10-13 | Hiroshi Shimizu | Transmission-reception integrated type non-contact ultrasonic transducer |
| CN101398409A (en) * | 2008-11-07 | 2009-04-01 | 哈尔滨工业大学 | Automatic detection method for oblique incidence wave technology steel plate and device thereof |
| CN101706266A (en) * | 2009-11-12 | 2010-05-12 | 哈尔滨工业大学 | Impulse electromagnet for electromagnetic acoustic transducer |
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2012
- 2012-10-26 CN CN201210416917.0A patent/CN102954774B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0067065A1 (en) * | 1981-06-10 | 1982-12-15 | Hitachi, Ltd. | Electromagnetic-acoustic measuring apparatus |
| JPS63246655A (en) * | 1987-04-01 | 1988-10-13 | Hiroshi Shimizu | Transmission-reception integrated type non-contact ultrasonic transducer |
| CN101398409A (en) * | 2008-11-07 | 2009-04-01 | 哈尔滨工业大学 | Automatic detection method for oblique incidence wave technology steel plate and device thereof |
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Effective date of registration: 20211027 Address after: 430000 room 531, 5 / F, building a, overseas talent building, No. 999, Gaoxin Avenue, Donghu New Technology Development Zone, Wuhan, Hubei Province Patentee after: Wuhan Yimu Precision Instrument Co.,Ltd. Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 1037 Patentee before: HUAZHONG University OF SCIENCE AND TECHNOLOGY |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141231 |