CN105021117A - Stay-wire type displacement sensor and measuring system based on the sensor - Google Patents
Stay-wire type displacement sensor and measuring system based on the sensor Download PDFInfo
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- CN105021117A CN105021117A CN201510366882.8A CN201510366882A CN105021117A CN 105021117 A CN105021117 A CN 105021117A CN 201510366882 A CN201510366882 A CN 201510366882A CN 105021117 A CN105021117 A CN 105021117A
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Abstract
The invention discloses a stay-wire type displacement sensor. The stay-wire type displacement sensor comprises a wheel hub, a stay wire, a constant-force spring, a bearing, a magnet, a magneto-sensitive chip and a shell; and the stay wire is disposed on a rotary shaft of the wheel hub in a coiling manner, the constant-force spring is connected with the wheel hub, the magnet is fixedly disposed on the rotary shaft and is coaxial with the rotary shaft, a certain axial gap is disposed between the magneto-sensitive chip and the magnet, the magneto-sensitive chip comprises a magnetic nanofilm, the magnetic nanofilm has a closed annular structure, the magnetic nanofilm forms a closed magnetic path in the length direction of the annular structure, and the width of the annular structure is less than an edge length of the annular structure. Correspondingly, the invention further provides a measuring system based on the stay-wire type displacement sensor. The displacement sensor of the invention has the advantages of high linear precision, simple usage and stable performance, and can satisfy requirements of most industrial fields for displacement measurement.
Description
Technical field
The present invention relates to surveying instrument field, particularly relate to a kind of stay-supported type displacement sensor and the measuring system based on this sensor.
Background technology
Existing industry, the military measurement to object space motion require more and more higher, and environment becomes increasingly complex, and utilizes original metering system, can not meet the requirements such as measuring accuracy, environment, frequency, coupling.Displacement transducer is the important component part in measuring system, and wherein, stay-supported type displacement sensor has application widely in industrial, military etc. measurement.
Traditional stay-supported type displacement sensor adopts multiturn potentiometer as the core component of displacement transducer outer corner measurement mostly, it mechanical shift is converted to the resistance of linear or arbitrary function relation with it by potentiometer element or voltage exports, and generic linear potentiometer and circular potentiometer all can be used separately as straight-line displacement and angular displacement sensor.But, for realizing the potentiometer that measurement displacement object designs, require between change in displacement and resistance variations, have to determine a relation, the movable brush of potentiometric displacement transducer is connected with testee, and the displacement of object causes the resistance variations of potentiometer mobile terminal.The variable quantity of resistance reflects the value of displacement, and the increase of resistance still reduces, and indicates the direction of displacement.Usually on potentiometer, pass to supply voltage, resistance variations is converted to voltage and exports.Traditional stay-supported type displacement sensor due to resistance when its brush moves with circle resistance for stepped change, its output characteristics is also in stepped appearance.If this displacement transducer be used as in servo-drive system Displacement Feedback element time, then excessive step voltage can cause system oscillation.Therefore should reduce the resistance value of every circle in the making of potentiometer as far as possible.Simultaneously, another major defect of potentiometric transducer be easy to wear, resolving power is poor, resistance is on the low side, high frequency characteristics is poor, thus cause the decline of measuring accuracy, and owing to limiting by the potentiometer number of turns, be difficult to the measurement meeting the application such as Large travel range, high precision, cause the range of application of stay-supported type displacement sensor to be very restricted.
Therefore, work out a kind of touchless stay-supported type displacement sensor technology, and exploitation meets the high-performance stay-supported type displacement sensor of industrial measurement applications there, has certain realistic meaning and practical value.
Summary of the invention
Technical matters to be solved by this invention is that the potentiometer how overcome in traditional stay-supported type displacement sensor exists shortcoming easy to wear, resolving power is poor, resistance is low, high frequency characteristics is poor etc., and traditional displacement transducer is difficult to meet Large travel range and low etc. the defect of measuring accuracy.
In order to solve the problems of the technologies described above, the invention provides a kind of stay-supported type displacement sensor, comprise wheel hub, bracing wire, constant force spring, bearing, magnet, magnetosensitive chip and housing, described cable quadrant is in the rotating shaft being arranged on wheel hub, described constant force spring is connected with wheel hub, described magnet to be fixedly installed in described rotating shaft and coaxial with rotating shaft, between described magnetosensitive chip and magnet, there is certain end play, described magnetosensitive chip comprises magnetic nanometer film, described magnetic nanometer film is closed ring texture, and described magnetic nanometer film is along the length direction formation closed magnetic circuit of ring texture, the width of described ring texture is less than the length of side of ring texture.
Further, described bracing wire is for measuring displacement, and described wheel hub is used for described displacement to be converted into the anglec of rotation.
Further, the width of described ring texture is 100nm-30mm, and the length of side of described ring texture is 1mm-300mm.
Further, the end play between described magnetosensitive chip and magnet is 5mm.
Correspondingly, present invention also offers a kind of measuring system based on stay-supported type displacement sensor, comprise above-mentioned stay-supported type displacement sensor, treatment element, communication interface and display element, described stay-supported type displacement sensor is for gathering displacement information and described displacement information being converted into rotation angle information, described treatment element is used for that described rotation angle information is carried out process and draws displacement, described communication interface is used for displacement to export with digital signal, and described display element is for showing described digital signal.
Further, described treatment element comprises computing unit, and described computing unit is used for calculating displacement according to rotation angle information.
Further, described communication interface is serial SPI interface and USART interface.
Further, described system also comprises fault detection module and alarm module, and described fault detection module is for detecting described stay-supported type displacement sensor and whether processing module breaks down, and described alarm module is used for reporting to the police after system malfunctions.
Further, described system also comprises memory module, and described memory module is used for preserving data message after system malfunctions.
Stay-supported type displacement sensor of the present invention and the measuring system based on this sensor, have following beneficial effect:
1, displacement transducer linear precision of the present invention high, use simple, stable performance and the requirement of most industrial circle to displacement measurement can be met.
2, displacement can be converted to the measurement of the wheel hub anglec of rotation by displacement transducer of the present invention, thus avoid adopting potentiometer, and measuring accuracy is high, the angle signal that wherein magnetosensitive chip is responded to can carry out adaptive equalization along with the change of the factor such as magnetic field intensity, temperature, throws away in the presence of a harsh environment and can have higher degree of accuracy.
3, can preserve the data of measurement in system of the present invention upon system failure in time, performance is highly stable.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the measuring system based on stay-supported type displacement sensor of the present invention.
In figure: 1-wheel hub, 2-bracing wire, 3-constant force spring, 4-magnet, 5-measuring system.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, all belongs to the scope of protection of the invention.
Displacement such as the formula (1) of stay-supported sensor of the present invention calculates,
Wherein, x is the displacement that bracing wire stretches or shrinks, and l is individual pen winding length, and Δ δ is that bracing wire axle moves compensation, θ
0for initial angle angle value, θ is the angle value after rotation.
As shown in Figure 1, because in winding process, bracing wire arrangement creates axial movement, the parameters such as the width that arranges of individual pen winding length with the formula in (1) and radius R, coiling related.Individual pen winding length computing formula is as shown in formula (2):
Wherein, R is roller radius, and d is the diameter of bracing wire.
For eliminating the measured deviation that bracing wire axial array causes, carry out rectification building-out to individual pen winding length, bracing wire axle moves and compensates as shown in formula (3):
Wherein, h is the distance along value pilot hole under roller, and w is reel column width, and Q is number of turns.
The relation of displacement and the anglec of rotation can be determined by formula (1)-(3).
Embodiment one:
The invention provides a kind of stay-supported type displacement sensor, comprise wheel hub 1, bracing wire 2, constant force spring 3, bearing, magnet 4, magnetosensitive chip and housing, described bracing wire 2 coiling is arranged in the rotating shaft of wheel hub 1, described constant force spring 3 is connected with wheel hub 1, described magnet 4 to be fixedly installed in described rotating shaft and coaxial with rotating shaft, between described magnetosensitive chip and magnet 4, there is certain end play, described magnetosensitive chip comprises magnetic nanometer film, described magnetic nanometer film is closed ring texture, and described magnetic nanometer film is along the length direction formation closed magnetic circuit of ring texture, the width of described ring texture is less than the length of side of ring texture,
Wherein, described bracing wire 2 is for measuring displacement, and described wheel hub 1 is for being converted into the anglec of rotation by described displacement, and the width of described ring texture is 100nm, and the length of side of described ring texture is 1mm, and the end play between described magnetosensitive chip and magnet 4 is 5mm.
Correspondingly, present invention also offers a kind of measuring system based on stay-supported type displacement sensor, comprise above-mentioned stay-supported type displacement sensor, treatment element, communication interface and display element, described stay-supported type displacement sensor is for gathering displacement information and described displacement information being converted into rotation angle information, described treatment element is used for that described rotation angle information is carried out process and draws displacement, described communication interface is used for displacement to export with digital signal, and described display element is for showing described digital signal.
Wherein, described treatment element comprises computing unit, and described computing unit is used for calculating displacement according to rotation angle information, and described communication interface is serial SPI interface and USART interface.
Described measuring system 5 also comprises fault detection module, alarm module and memory module, and described fault detection module is for detecting described stay-supported type displacement sensor and whether processing module breaks down; Described alarm module is used for reporting to the police after system malfunctions; Described memory module is used for preserving data message after system malfunctions.
Embodiment two:
The invention provides a kind of stay-supported type displacement sensor, comprise wheel hub 1, bracing wire 2, constant force spring 3, bearing, magnet 4, magnetosensitive chip and housing, described bracing wire 2 coiling is arranged in the rotating shaft of wheel hub 1, described constant force spring 3 is connected with wheel hub 1, described magnet 4 to be fixedly installed in described rotating shaft and coaxial with rotating shaft, between described magnetosensitive chip and magnet 4, there is certain end play, described magnetosensitive chip comprises magnetic nanometer film, described magnetic nanometer film is closed ring texture, and described magnetic nanometer film is along the length direction formation closed magnetic circuit of ring texture, the width of described ring texture is less than the length of side of ring texture,
Wherein, described bracing wire 2 is for measuring displacement, and described wheel hub 1 is for being converted into the anglec of rotation by described displacement, and the width of described ring texture is 10mm, the length of side of described ring texture is 100mm, and the end play between described magnetosensitive chip and magnet 4 is 5mm.
Correspondingly, present invention also offers a kind of measuring system based on stay-supported type displacement sensor, comprise above-mentioned stay-supported type displacement sensor, treatment element, communication interface and display element, described stay-supported type displacement sensor is for gathering displacement information and described displacement information being converted into rotation angle information, described treatment element is used for that described rotation angle information is carried out process and draws displacement, described communication interface is used for displacement to export with digital signal, and described display element is for showing described digital signal.
Wherein, described treatment element comprises computing unit, and described computing unit is used for calculating displacement according to rotation angle information, and described communication interface is serial SPI interface and USART interface.
Described measuring system 5 also comprises fault detection module, alarm module and memory module, and described fault detection module is for detecting described stay-supported type displacement sensor and whether processing module breaks down; Described alarm module is used for reporting to the police after system malfunctions; Described memory module is used for preserving data message after system malfunctions.
Embodiment three:
The invention provides a kind of stay-supported type displacement sensor, comprise wheel hub 1, bracing wire 2, constant force spring 3, bearing, magnet 4, magnetosensitive chip and housing, described bracing wire 2 coiling is arranged in the rotating shaft of wheel hub 1, described constant force spring 3 is connected with wheel hub 1, described magnet 4 to be fixedly installed in described rotating shaft and coaxial with rotating shaft, between described magnetosensitive chip and magnet 4, there is certain end play, described magnetosensitive chip comprises magnetic nanometer film, described magnetic nanometer film is closed ring texture, and described magnetic nanometer film is along the length direction formation closed magnetic circuit of ring texture, the width of described ring texture is less than the length of side of ring texture,
Wherein, described bracing wire 2 is for measuring displacement, and described wheel hub 1 is for being converted into the anglec of rotation by described displacement, and the width of described ring texture is 30mm, the length of side of described ring texture is 300mm, and the end play between described magnetosensitive chip and magnet 4 is 5mm.
Correspondingly, present invention also offers a kind of measuring system based on stay-supported type displacement sensor, comprise above-mentioned stay-supported type displacement sensor, treatment element, communication interface and display element, described stay-supported type displacement sensor is for gathering displacement information and described displacement information being converted into rotation angle information, described treatment element is used for that described rotation angle information is carried out process and draws displacement, described communication interface is used for displacement to export with digital signal, and described display element is for showing described digital signal.
Wherein, described treatment element comprises computing unit, and described computing unit is used for calculating displacement according to rotation angle information, and described communication interface is serial SPI interface and USART interface.
Described measuring system 5 also comprises fault detection module, alarm module and memory module, and described fault detection module is for detecting described stay-supported type displacement sensor and whether processing module breaks down; Described alarm module is used for reporting to the police after system malfunctions; Described memory module is used for preserving data message after system malfunctions.
Stay-supported type displacement sensor of the present invention and the measuring system based on this sensor, have following beneficial effect:
1, displacement transducer linear precision of the present invention high, use simple, stable performance and the requirement of most industrial circle to displacement measurement can be met.
2, displacement can be converted to the measurement of the wheel hub anglec of rotation by displacement transducer of the present invention, thus avoid adopting potentiometer, and measuring accuracy is high, the angle signal that wherein magnetosensitive chip is responded to can carry out adaptive equalization along with the change of the factor such as magnetic field intensity, temperature, throws away in the presence of a harsh environment and can have higher degree of accuracy.
3, can preserve the data of measurement in system of the present invention upon system failure in time, performance is highly stable.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (9)
1. a stay-supported type displacement sensor, it is characterized in that, comprise wheel hub (1), bracing wire (2), constant force spring (3), bearing, magnet (4), magnetosensitive chip and housing, described bracing wire (2) coiling is arranged in the rotating shaft of wheel hub (1), described constant force spring (3) is connected with wheel hub (1), described magnet (4) to be fixedly installed in described rotating shaft and coaxial with rotating shaft, between described magnetosensitive chip and magnet (4), there is certain end play, described magnetosensitive chip comprises magnetic nanometer film, described magnetic nanometer film is closed ring texture, and described magnetic nanometer film is along the length direction formation closed magnetic circuit of ring texture, the width of described ring texture is less than the length of side of ring texture.
2. stay-supported type displacement sensor according to claim 1, is characterized in that, described bracing wire (2) is for measuring displacement, and described wheel hub (1) is for being converted into the anglec of rotation by described displacement.
3. stay-supported type displacement sensor according to claim 2, is characterized in that, the width of described ring texture is 100nm-30mm, and the length of side of described ring texture is 1mm-300mm.
4. stay-supported type displacement sensor according to claim 3, is characterized in that, the end play between described magnetosensitive chip and magnet (4) is 5mm.
5. the measuring system based on stay-supported type displacement sensor, it is characterized in that, comprise the stay-supported type displacement sensor described in claim 1-4, treatment element, communication interface and display element, described stay-supported type displacement sensor is for gathering displacement information and described displacement information being converted into rotation angle information, described treatment element is used for that described rotation angle information is carried out process and draws displacement, described communication interface is used for displacement to export with digital signal, and described display element is for showing described digital signal.
6. the measuring system based on stay-supported type displacement sensor according to claim 5, is characterized in that, described treatment element comprises computing unit, and described computing unit is used for calculating displacement according to rotation angle information.
7. the measuring system based on stay-supported type displacement sensor according to claim 6, is characterized in that, described communication interface is serial SPI interface and USART interface.
8. the measuring system based on stay-supported type displacement sensor according to claim 5-7 any one, it is characterized in that, described system also comprises fault detection module and alarm module, described fault detection module is for detecting described stay-supported type displacement sensor and whether processing module breaks down, and described alarm module is used for reporting to the police after system malfunctions.
9. the measuring system based on stay-supported type displacement sensor according to claim 8, is characterized in that, described system also comprises memory module, and described memory module is used for preserving data message after system malfunctions.
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| CN106225658A (en) * | 2016-08-22 | 2016-12-14 | 蚌埠日月仪器研究所有限公司 | Stay-supported type displacement sensor |
| CN110631614A (en) * | 2019-11-05 | 2019-12-31 | 中远海运港口有限公司 | Pull-wire type displacement sensor based on absolute type coding |
| CN113931238A (en) * | 2021-10-15 | 2022-01-14 | 中交天津港湾工程研究院有限公司 | Method for monitoring position of potential slip surface of foundation pit slope |
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Application publication date: 20151104 |