CN114264221A - Magnetostrictive displacement sensor for precise control - Google Patents
Magnetostrictive displacement sensor for precise control Download PDFInfo
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- CN114264221A CN114264221A CN202111597958.XA CN202111597958A CN114264221A CN 114264221 A CN114264221 A CN 114264221A CN 202111597958 A CN202111597958 A CN 202111597958A CN 114264221 A CN114264221 A CN 114264221A
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 25
- 230000006698 induction Effects 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000013016 damping Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000005284 excitation Effects 0.000 description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
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Abstract
The invention discloses a magnetostrictive displacement sensor for precise control, which comprises a base, a permanent magnet, a magnetostrictive sensitive element and a pickup detection device, wherein two sides of the base are respectively provided with a fixed end plate, the magnetostrictive sensitive element is arranged between the two fixed end plates, one side of the base can be horizontally moved and is provided with the pickup detection device, and the other side of the base is provided with the permanent magnet through an upright post; the pick-up detection device comprises a movable sliding block, a coil framework, an induction coil and a supporting rod, wherein the induction coil is tightly wound on the coil framework, the coil framework is fixedly connected to the movable sliding block through the supporting rod, and the movable sliding block is slidably arranged on the base; the magnetostrictive sensitive element horizontally passes through the central lines of the coil framework and the permanent magnet. The magnetostrictive displacement sensor for displacement detection has the advantages of being capable of being precisely controlled, high in measurement precision and good in stability.
Description
Technical Field
The invention belongs to the field of industrial automation, and particularly relates to a magnetostrictive displacement sensor for precise control.
Background
Since the discovery of the magnetostrictive phenomenon, research on the magnetostrictive phenomenon has never been stopped in various countries. The sensor technology in the 80 th century is paid attention to various fields and is researched in a large scale. Nowadays, the industrialization process is accelerated, and the sensors develop towards automation, digitization and precision. Researchers have begun to use magnetostrictive sensors for displacement detection, and have used magnetostrictive materials as sensors for detecting displacement in industrial applications.
The magnetostrictive displacement sensor is a research hotspot in the field of precise control due to the characteristics of magnetostrictive materials, has strong environmental adaptability, can work under severe working conditions, is not easily affected by pollution and corrosion, and has strong anti-interference capability.
Disclosure of Invention
The invention aims to provide a magnetostrictive displacement sensor which is used for precise control, high in measurement precision and good in stability.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a magnetostrictive displacement sensor for precise control comprises a base, a permanent magnet, magnetostrictive sensitive elements and a pickup detection device, wherein two sides of the base are respectively provided with a fixed end plate, the magnetostrictive sensitive elements are arranged between the two fixed end plates, one side of the base is provided with the pickup detection device in a horizontally movable manner, and the other side is provided with the permanent magnet through an upright post;
the pickup detection device comprises a movable sliding block, a coil framework, an induction coil and a supporting rod, wherein the induction coil is tightly wound on the coil framework, the coil framework is fixedly connected to the movable sliding block through the supporting rod, and the movable sliding block is slidably arranged on the base;
the magnetostrictive sensitive element horizontally penetrates through the central lines of the coil framework and the permanent magnet.
Furthermore, damping devices are respectively arranged at the parts of the magnetostrictive sensitive elements close to the two ends, and the magnetostrictive sensitive elements horizontally penetrate through the coil framework, the permanent magnet and the central line of the damping devices.
Furthermore, the two fixed end plates are consistent in structure size, through hole grooves are formed in the fixed end plates, and two ends of the magnetostrictive sensitive element respectively penetrate through the corresponding through hole grooves to be fixed.
Further, the magnetostrictive sensitive element is a Galfenol waveguide wire.
Further, the permanent magnet is of a circular ring structure.
Furthermore, a concave slide rail groove is transversely formed in the base, and a protrusion matched with the slide rail groove is arranged at the bottom of the movable slide block.
When the invention detects the displacement to be detected, an excitation pulse signal is given to the magnetostrictive sensitive element, the magnetic field in the coil will be changed, after the excitation magnetic field is superposed with the bias magnetic field, the stress torsional wave generated by the vibration of the sensitive element is collected, the time interval information between the excitation pulse signal and the torsional wave signal is collected, and the specific displacement between the induction coil and the permanent magnet can be calculated by combining the propagation speed of the stress torsional wave in the magnetostrictive sensitive element, therefore, the invention has the following advantages:
1. the position of the fixed permanent magnet is unchanged, and the displacement between the fixed permanent magnet and the fixed permanent magnet is changed by moving the pick-up detection device, so that the phenomenon that the sensitive element is magnetized due to frequent movement of the permanent magnet is avoided.
2. And the damping devices arranged at the two ends of the sensor can be used for absorbing the signals of the stress torsional waves propagated to the end faces and rebounded.
Drawings
FIG. 1 is a schematic structural diagram of a preferred embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of the bobbin and the movable slider according to the preferred embodiment of the present invention;
fig. 3 is a schematic structural diagram of the preferred embodiment 2 of the invention.
Detailed Description
In order that those skilled in the art can better understand the present invention, the following technical solutions are further described with reference to the accompanying drawings and examples.
Embodiment 1, referring to fig. 1 and 2, a magnetostrictive displacement sensor for precise control according to the present invention includes a base 5, a permanent magnet 7, a magnetostrictive sensor 6, an induction coil 4, a coil frame 3, a support rod 9, a column 10, a movable slider 2, and a fixed end plate 1. The number of the fixed end plates 1 is two, the fixed end plates are respectively arranged at two ends of the sensor and are used for fixing the magnetostrictive sensitive element 6; the support rod 9 and the upright post 10 are respectively used for fixing the coil framework 3 and the permanent magnet 7; the permanent magnet 7 is positioned on the right side of the sensor; the coil framework 3 is tightly wound with the induction coil 4 and is fixedly connected to the movable slide block 2 through a support rod 9; the magnetostrictive sensitive element 6 passes through the permanent magnet 7 and the coil framework 3; a sliding rail is arranged in the middle of the base 5, the movable sliding block 2 is arranged on the sliding rail of the base 5, and the further base 5 is made of non-magnetic materials such as copper, aluminum and the like; the fixed end plate 1 is made of non-magnetic materials such as copper, plastics and the like; the coil framework 3 is made of non-magnetic conducting materials such as copper and plastic; the supporting rod 9 is made of non-magnetic conducting materials such as copper, aluminum and the like; the moving slider 2 is a non-magnetic material such as copper, aluminum, etc.
The magnetostrictive sensitive element 6 is a Galfenol waveguide wire with the length of about 0.5 m; the permanent magnet 7 is designed into a circular structure, is positioned on the right side of the sensor and provides a bias magnetic field; an inwards concave slide rail groove is transversely arranged on the base 5, a circular hole is formed in the middle of the top end of the movable sliding block 2 and used for fixing a support rod 9 of the coil framework 3, a bulge matched with the slide rail groove is arranged at the bottom end of the movable sliding block, and the sliding block can freely move on the base 5; the induction coil 4 is tightly wound on the coil framework 3, the wire diameter is 0.2mm, and the number of turns is about 600 and 800 turns; the coil framework 3, the induction coil 4, the supporting rod 9 and the movable sliding block 2 are fixedly connected to form a pickup detection device, and the position of the induction coil 4 in the sensor can be changed by sliding the movable sliding block 2 on the base 5.
When the displacement to be detected is detected, an excitation pulse signal is given to the magnetostrictive sensitive element 6, the signal passes through the sensitive element and generates an excitation magnetic field around the sensitive element, when the excitation pulse signal passes through the coil framework 3, the induction coil 4 on the framework captures the excitation pulse signal, the magnetic field in the coil is changed, the change of the magnetic field enables the induction coil 4 to generate induced electromotive force, the generated induced electromotive force expresses the signal waveform of the induced electromotive force through an oscilloscope, and when the excitation pulse signal is transmitted to a bias magnetic field, a new synthetic spiral magnetic field is generated after the excitation magnetic field generated by the excitation signal is superposed with the bias magnetic field. Under the action of the synthetic helical magnetic field, the magnetostrictive sensitive element 6 deforms and vibrates along the direction of the magnetic field due to the characteristics of the magnetostrictive material, the vibration generates a stress torsional wave, and the torsional wave is transmitted to two ends along the sensitive element. When the stress torsional wave is transmitted to the coil skeleton 3, the induction coil 4 captures the torsional wave signal, so that induced electromotive force is generated again, and the oscilloscope collects the stress torsional wave signal. Recording the waveforms of the excitation pulse signal and the stress torsional wave in the oscilloscope, collecting the time interval of two sections of signals, collecting data, measuring the propagation speed of the stress torsional wave in the magnetostrictive sensitive element 6, and calculating to obtain the specific displacement of the induction coil 4 from the permanent magnet 7. In the whole working process, the induction coil 4 is tightly wound on the coil framework 3, and the coil framework 3 is arranged on the movable sliding block 2, so that the adjustment is convenient to improve the control precision of the sensor; meanwhile, the coil framework 3 is not contacted with the magnetostrictive sensitive element 6, so that the stability of the torsional wave signal and the measurement accuracy of the induced electromotive force generated by the induction coil 4 are improved.
The foregoing embodiments are merely illustrative of the principles of the present invention and its efficacy, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (6)
1. A magnetostrictive displacement sensor for precision control, characterized in that: the device comprises a base (5), a permanent magnet (7), a magnetostrictive sensitive element (6) and a pickup detection device, wherein two sides of the base (5) are respectively provided with a fixed end plate (1), the magnetostrictive sensitive element (6) is arranged between the two fixed end plates (1), one side of the base (5) is horizontally provided with the pickup detection device, and the other side of the base is provided with the permanent magnet (7) through an upright post (10);
the pick-up detection device comprises a movable sliding block (2), a coil framework (3), an induction coil (4) and a supporting rod (9), wherein the induction coil (4) is tightly wound on the coil framework (3), the coil framework (3) is fixedly connected to the movable sliding block (2) through the supporting rod (9), and the movable sliding block (2) is slidably mounted on a base (5);
the magnetostrictive sensitive element (6) horizontally penetrates through the central lines of the coil framework (3) and the permanent magnet (7).
2. A magnetostrictive displacement sensor for precision control according to claim 1, characterized in that: damping devices (8) are respectively arranged at the parts, close to the two ends, of the magnetostrictive sensitive element (6), and the magnetostrictive sensitive element (6) horizontally penetrates through the coil framework (3), the permanent magnet (7) and the central line of the damping devices (8).
3. A magnetostrictive displacement sensor for precision control according to claim 1, characterized in that: the two fixed end plates (1) are consistent in structural size, through hole grooves are formed in the fixed end plates (1), and two ends of the magnetostrictive sensitive element (6) penetrate through the corresponding through hole grooves to be fixed.
4. A magnetostrictive displacement sensor for precision control according to claim 1, characterized in that: the magnetostrictive sensitive element (6) is a Galfenol waveguide wire.
5. A magnetostrictive displacement sensor for precision control according to claim 1, characterized in that: the permanent magnet (7) is of a circular ring structure.
6. A magnetostrictive displacement sensor for precision control according to claim 1, characterized in that: the base (5) is transversely provided with an inwards concave slide rail groove, and the bottom of the movable slide block (2) is provided with a bulge matched with the slide rail groove.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111597958.XA CN114264221A (en) | 2021-12-24 | 2021-12-24 | Magnetostrictive displacement sensor for precise control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111597958.XA CN114264221A (en) | 2021-12-24 | 2021-12-24 | Magnetostrictive displacement sensor for precise control |
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| CN114264221A true CN114264221A (en) | 2022-04-01 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101793492A (en) * | 2010-03-04 | 2010-08-04 | 上海雷尼威尔测量技术有限公司 | Low-noise magnetostrictive displacement sensor |
| CN105180790A (en) * | 2015-05-22 | 2015-12-23 | 河北工业大学 | Magnetostriction micro displacement meter |
| CN107192426A (en) * | 2017-07-11 | 2017-09-22 | 青岛贵和测控科技有限公司 | A kind of magnetostriction torsional wave pick device |
| CN108680092A (en) * | 2018-04-27 | 2018-10-19 | 中国计量大学 | A kind of ferrite magnetostrictive displacement sensor |
| CN213090676U (en) * | 2020-06-01 | 2021-04-30 | 北京特倍福电子技术有限公司 | Magnetostrictive displacement sensor |
| CN113028965A (en) * | 2021-03-10 | 2021-06-25 | 国家石油天然气管网集团有限公司华南分公司 | Giant magnetoresistance detection device of magnetostrictive displacement sensor |
-
2021
- 2021-12-24 CN CN202111597958.XA patent/CN114264221A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101793492A (en) * | 2010-03-04 | 2010-08-04 | 上海雷尼威尔测量技术有限公司 | Low-noise magnetostrictive displacement sensor |
| CN105180790A (en) * | 2015-05-22 | 2015-12-23 | 河北工业大学 | Magnetostriction micro displacement meter |
| CN107192426A (en) * | 2017-07-11 | 2017-09-22 | 青岛贵和测控科技有限公司 | A kind of magnetostriction torsional wave pick device |
| CN108680092A (en) * | 2018-04-27 | 2018-10-19 | 中国计量大学 | A kind of ferrite magnetostrictive displacement sensor |
| CN213090676U (en) * | 2020-06-01 | 2021-04-30 | 北京特倍福电子技术有限公司 | Magnetostrictive displacement sensor |
| CN113028965A (en) * | 2021-03-10 | 2021-06-25 | 国家石油天然气管网集团有限公司华南分公司 | Giant magnetoresistance detection device of magnetostrictive displacement sensor |
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