CN201184830Y - Ultra magnetic deformation pressure sensor and the sensor combination - Google Patents
Ultra magnetic deformation pressure sensor and the sensor combination Download PDFInfo
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- CN201184830Y CN201184830Y CNU2007200973622U CN200720097362U CN201184830Y CN 201184830 Y CN201184830 Y CN 201184830Y CN U2007200973622 U CNU2007200973622 U CN U2007200973622U CN 200720097362 U CN200720097362 U CN 200720097362U CN 201184830 Y CN201184830 Y CN 201184830Y
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- magnetostrictive
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Abstract
The utility model relates to a super-magnetostrictive pressure transducer and a combination thereof. The transducer is characterized in that three super-magnetostrictive rods are vertically and uniformly distributed on the inner circle of a transducer pedestal; two permanent magnetic rods or two field coils are vertically and symmetrically distributed on the outer circle of the transducer pedestal; upper discoid permeable plates and lower discoid permeable plates are arranged above and below the two permanent magnetic rods or the field coils; the semidiameter of the permeable plates are a little larger than the semidiameters of the installed permanent magnetic rods or the field coils; the two permanent magnetic rods are magnetized axially in the same direction; the two field coils are coiled in the same direction with the same current direction; the permanent magnetic rods or the field coils are a little shorter than the super-magnetostrictive rods so that gaps are formed between the top faces of the field coils and the bottom surface of the upper permeable plates, and the gaps are filled with nonpermeable adhesive with hall elements affixed thereto; induction coils are coiled on the super-magnetostrictive rods; the upper permeable plates are arranged on a carrier block; the lower permeable plates are arranged on a pedestal; an encloser is arranged on the lower permeable plates, which encloses the components on the pedestal into a whole unit. The carrier block protrudes beyond the upper surface of the encloser. The transducer combination is formed with the transducers as base units.
Description
Technical field
The utility model relates to the pressure transducer technology, is specially a kind of magnetostrictive stress sensor and this sensor combinations, and international Patent classificating number intends being Int.Cl.G01L 9/00 (2006.01)
Technical background
Pressure transducer industrial have widely use.
What pressure sensor application was more at present is resistive pressure sensor and piezoelectric pressure indicator.Resistive pressure sensor when Test Application, must stick on foil gauge on the test specimen or the flexible member of sensor on, therefore, the performance of bonding agent will directly influence the operating characteristic of strainometer, be easy to generate measuring error.In addition, resistive pressure sensor is mainly used in static(al) and the dynamic force measurement of low frequency.Piezoelectric pressure indicator is mainly used in dynamic force measurement, because of its measuring-signal decay in time very fast, should not be used for static force measurement.In addition, the compressive strength of piezoelectric has only 4MPa, so less with the pressure transducer range of piezoelectric making, usable range is restricted.
The utility model content
At the deficiencies in the prior art, the technical problems to be solved in the utility model is, design a kind of magnetostrictive stress sensor and this sensor combinations, it is big that this pressure transducer has output power, and test signal is accurate, overload capacity is strong, life-span is long, and is easy to maintenance, adapts to abominable working environment, be suitable for static and dynamic force measurement simultaneously, can adopt current excitation also can adopt advantages such as permanent magnet excitation.
The technical scheme that the utility model solves described sensor technology problem is: design a kind of magnetostrictive stress sensor, it is characterized in that vertically being evenly equipped with three giant magnetostrictive rods on the interior circle of base of described sensor, its outer ring vertical symmetry is furnished with two Permanentmagnet bars or two magnetizing coils; The upper and lower of described two Permanentmagnet bars or two magnetizing coils is separately installed with the upper conduction magnetic board of disc soft magnetic material, following magnetic conductive board, and its radius is slightly larger than the installation radius of described Permanentmagnet bar or magnetizing coil; Described two Permanentmagnet bar magnetizing directions are axially, and direction is identical; The coiling direction of described two magnetizing coils is identical, and its direction of current is also identical; The length of described Permanentmagnet bar or magnetizing coil slightly is shorter than the length of described giant magnetostrictive rod, make between the bottom surface of the end face of Permanentmagnet bar after the installation or magnetizing coil and upper conduction magnetic board and leave the space, in this space, be filled with the viscose of non-magnetic conduction, and paste fixedly Hall element therein; Be wound with inductive coil on the described giant magnetostrictive rod; Upper conduction magnetic board is installed on the carrier block by the screw combination, following magnetic conductive board is installed on the base by the bottom surface screw, outer cover is installed on the following magnetic conductive board by the side screw, and each part on the base is encapsulated as integral body, but described carrier block protrudes in the upper surface of case for packaging.
The technical scheme that the utility model solves described sensor combinations technical matters is: design a kind of wide range sensor combinations, it is characterized in that it is the elementary cell structure by magnetostrictive stress sensor of the present invention, its concrete structure is: a force bearing plate lies on the described carrier block of a sensor elementary cell I, and relies on the connecting link location; Each sensor elementary cell is fixed on the sensor combinations base with stud component; The lower end of described connecting link is connected with the sensor combinations base with screw thread, and the upper end is fixed with nut and described force bearing plate, thereby constitutes sensor combinations integral body.
Compared with prior art, magnetostrictive stress sensor described in the utility model has following advantage: because magnetostrictive stress sensor embodiment has adopted two Hall elements and three inductive coils to measure the magnetic variation signal, so transducer sensitivity, the precision height; Because can adopt the combination of any a plurality of magnetostrictive stress sensor elementary cell I, so transducer range is big, and adjustable; Because design is adopted Hall element to get the signal of static magnetic field respectively and is adopted inductive coil to extract the signal of variation magnetic field, so both being applicable to static force, measured by this sensor, also be applicable to dynamic force measurement; Because the relative permeability of giant magnetostrictive material is lower, magnetic property is poor, and the size of material is bigger, leakage field is serious, therefore in the structural design of pressure transducer, use the good soft magnetic material of magnetic property to do upper conduction magnetic board and following magnetic conductive board, effectively to prevent magnetic dispersion, and adopt and gather magnetic principle, make wherein the residing magnetic field of giant magnetostrictive rod as far as possible evenly, so not only can improve the utilization factor of giant magnetostrictive material, reduce material internal stress, but also can improve sensitivity, precision and the linearity of whole pressure transducer; The utility model can adopt permanent magnet that the bias magnetic field of magnetostrictive stress sensor is provided, so do not need magnetizing coil and electric power system, there is not the problem of coil heating in not power consumption, and long service life, can not have maintenance operation for a long time; The utility model also can adopt the current excitation mode, and its bias magnetic field that provides is adjustable, operating voltage is also lower, have excellent safety can and features of experiment repeatedly; Because the giant magnetostrictive material Curie temperature is higher, be 360-390 ℃, the working temperature broad, even be heated to more than the Curie temperature, also be to lose Magnetostrictive Properties instantaneously and can not produce permanent depolarization, applicable to abominable working environments such as high temperature, when being cooled to Curie-point temperature when following, its Magnetostrictive Properties can be recovered again fully, so no overheating failure problem; The giant magnetostrictive material mechanical response time is microsecond only, and is also faster than people's thinking, and therefore the force transducer response speed of making is fast; Because under the same magnetic field of giant magnetostrictive material, the certain value that increases to along with stress, it is constant that relative permeability will be tending towards, and the compressive yield stress of rare-earth-iron super magnetostriction material is up to 700Mpa, can withstand the pressure of 700MPa and do not damage, so magnetostrictive stress sensor has very high load-bearing capacity, and overload capacity is strong; Because this sensor need not to paste foil gauge, do not need in the middle of couplant, manufacture and design with installation method on relative simple.After the utility model adopts above measure, the sensing signal output power is enough big, requires to reduce down to the undesired signal amplification system or to amplifying element, has simplified apparatus structure, improved precision, this also is that the utility model sensor is better than the piezoelectric transducer part.
Description of drawings
Fig. 1 is the one-piece construction front view of a kind of embodiment of the utility model magnetostrictive stress sensor;
Fig. 2 is the one-piece construction vertical view of a kind of embodiment of the utility model magnetostrictive stress sensor;
Fig. 3 is the embodiment front view (cut-open view) of 4 a kind of array modes of magnetostrictive stress sensor of the utility model;
Fig. 4 is 4 a kind of array modes of magnetostrictive stress sensor of the utility model, but removes the embodiment vertical view behind force bearing plate 18 and the nut 20;
The graph of a relation of the giant magnetostrictive material that Fig. 5 selects for use for the utility model magnetostrictive stress sensor relative permeability and magnetic field intensity under different compressive stress.
Embodiment
Further narrate the utility model below in conjunction with embodiment and accompanying drawing thereof:
Magnetostrictive stress sensor (hereinafter to be referred as the sensor) embodiment (shown in Fig. 1,2) of the utility model design, it is characterized in that vertically being evenly equipped with three giant magnetostrictive rods 6 on the interior circle of base 2 of described sensor, its outer ring vertical symmetry is furnished with two Permanentmagnet bars 5 or two magnetizing coils 17; The upper and lower of described two Permanentmagnet bars 5 or two magnetizing coils 17 is separately installed with the upper conduction magnetic board 8 of disc soft magnetic material, following magnetic conductive board 3, and its radius is slightly larger than the installation radius of described Permanentmagnet bar 5 or magnetizing coil 17; Described two Permanentmagnet bar 5 magnetizing directions are axially, and direction is identical; The coiling direction of described two magnetizing coils 17 is identical, and its direction of current is also identical; The length of described Permanentmagnet bar 5 or magnetizing coil 17 slightly is shorter than the length of described giant magnetostrictive rod 6, make between the bottom surface of the end face of Permanentmagnet bar 5 after the installation or magnetizing coil 17 and upper conduction magnetic board 8 and leave the space, in this space, be filled with the viscose of non-magnetic conduction, and paste fixedly Hall element 14 therein; Be wound with inductive coil 13 on the described giant magnetostrictive rod 6; Upper conduction magnetic board 8 is installed on the carrier block 9 by the screw combination, following magnetic conductive board 3 is installed on the base 2 by the bottom surface screw, outer cover 7 is installed on the following magnetic conductive board 3 by side screw 4, and each part on the base 2 is encapsulated as integral body, but described carrier block 9 protrudes in the upper surface of case for packaging 7.
The further information of the utility model sensor is that described 4 the bottom surface screws 1 of magnetic conductive board 3 usefulness down of embodiment are installed on the base 2 of sensor, and Permanentmagnet bar 5 or magnetizing coil 17 and giant magnetostrictive rod 6 usefulness bonding agents are connected with following magnetic conductive board 3; Equally, upper conduction magnetic board 8 also is to be connected with giant magnetostrictive rod 6 with bonding agent, carrier block 9 usefulness screws combinations (10,11,12) are connected with upper conduction magnetic board 8, outer cover 7 usefulness side screws 4 are connected with following magnetic conductive board 3, and each part on the base 2 is encapsulated as integral body, but described carrier block 9 protrudes in the upper surface of case for packaging 7.During work, the compressive stress that applies is applied on the upper conduction magnetic board 8 by carrier block 9, is applied on the giant magnetostrictive rod 6 again; The length of Permanentmagnet bar 5 slightly is shorter than the length of giant magnetostrictive rod 6, makes to keep a space between Permanentmagnet bar 5 and the upper conduction magnetic board 8, is filled with the viscose of non-magnetic conduction in this space, and pastes fixedly Hall element 14 therein, so that measure static pressure; Simultaneously on the described giant magnetostrictive rod 6 around on inductive coil 13, be used to measure dynamic pressure.
Need to prove that described Hall element 14 of the utility model sensor embodiment and inductive coil 13 are installed simultaneously, but also one of them can be installed separately, also is that the utility model sensor is not got rid of the design that one of them is installed.When only requiring to measure static pressure, sensor just can only be installed Hall element 14; When only requiring to measure dynamic pressure, sensor just can only be installed inductive coil 13; When requiring not only energy measurement static pressure but also energy measurement dynamic pressure, just Hall element 14 and inductive coil 13 need be installed simultaneously.
Giant magnetostrictive rod 6 described in the utility model is to be that the rare-earth-iron super magnetostriction material of Tb-Dy-Fe is made by principal ingredient, can directly buy from market.Described rare-earth-iron super magnetostriction material is meant a kind of new function material that mechanical energy and magnetic energy can be changed mutually, has excellent specific properties such as magnetic mechanical coupling coefficient height, response speed are fast, energy density height.The utilization of the utility model sensor be the magnetostrictive reaction of novel rare-earth iron super magnetostriction material.The magnetostrictive reaction of described giant magnetostrictive material is meant in certain magnetic field, applies the external force effect to magnetic, the phenomenon that its magnetization changes.Its principle of work is: when applying compressive stress on giant magnetostrictive material (giant magnetostrictive rod), its magnetic characteristic (magnetic permeability) can change immediately, cause the Distribution of Magnetic Field in the described magnetic structure to change, can determine the size of institute's stress application according to this variation.If the stress of measuring is static force, then can monitors the magnetic induction density (as shown in Figure 1) at these places, thereby learn the compressive stress that is applied on the giant magnetostrictive material by Hall element 14 being installed at the air-gap place of magnetic structure; If the stress of measuring is dynamic force, then can as obtaining detection signal (as depicted in figs. 1 and 2) around last inductive coil 13 on the giant magnetostrictive rod 6, learn the dynamic compressive stress that applies in the somewhere of magnetic structure.
The magnetostrictive reaction of the described giant magnetostrictive material of the utility model sensor is relevant with the bias magnetic field that adds.During design, to at first test the magnetic characteristic of giant magnetostrictive material under different compressive stress and the variation relation in magnetic field, with the just bias magnetic field of determining material and the compressive stress scope that applies, thus the characteristic and the size of definite other magnetic cell such as permanent magnetic material (or coil), magnetic conductive board material etc.Wherein permanent magnet provides the bias magnetic field of magnetostrictive stress sensor, and two Permanentmagnet bars measure-alike, magnetizing direction all are axially, and direction is identical; Three giant magnetostrictive rods measure-alike, performance requirement is also identical.
When bias magnetic field hour, the relative permeability of giant magnetostrictive material is bigger with the variation of compressive stress, the force transducer of making is highly sensitive, and when bias magnetic field is big, the relative permeability of material reduces along with the increase that applies compressive stress slowly, basic and compressive stress has nothing to do, and force transducer sensitivity reduces, even can not work.Therefore, the bias magnetic field of the super magnetostriction force sensor of making should be selected in low the scope, and for example the bias magnetic field of the giant magnetostrictive rod that U.S. Etrema company is produced should be selected in (referring to Fig. 5) below the 20kA/m.
In addition when magnetic field hour, in certain compressive stress scope, the relative permeability of giant magnetostrictive material changes bigger under different compressive stress; Along with the relative permeability of the increase giant magnetostrictive material that applies compressive stress reduces slowly, be tending towards constant at last, at this moment compressive stress is the greatest measurement of super magnetostriction force sensor, and the greatest measurement of the force transducer that the giant magnetostrictive rod that for example utilizes U.S. Etrema company to produce is made is 18MPa (referring to Fig. 5).
For the giant magnetostrictive material of different batches, producer, its relative permeability is different with the relation property of compressive stress.Therefore, need concrete giant magnetostrictive material be made a concrete analysis of, determine the bias field of its working point, sensitivity is reduced because encourage too small or cross big city according to the requirement of dynamometry scope, sensitivity and size of the force transducer of design.For example should be selected in 10-20kA/m to the bias magnetic field that utilizes the giant magnetostrictive rod that U.S. Etrema company produces, the greatest measurement of the force transducer of making is 18MPa.At this moment, can obtain the different pressure measurement range of force transducer by the giant magnetostrictive rod of selecting different cross-sectional for use.
The bias magnetic field of the utility model working sensor can adopt current excitation to provide, and also can adopt permanent magnet to provide.Owing to the magnetic field that permanent magnet excitation provides is stable, response is fast, and is energy-conservation, do not need magnetizing coil and electric power system, so have not power consumption, do not have the problem of coil heating, can not have advantages such as maintenance operation for a long time, and relative simple, with low cost with manufacturing in design.The utility model embodiment has adopted permanent magnet to provide working sensor required bias magnetic field.Adjustable when the bias magnetic field that requires to provide, in the time of need testing repeatedly, the utility model sensor also can adopt current excitation to provide working sensor required bias magnetic field.At this moment can adopt in two Permanentmagnet bar 5 positions shown in Figure 2 to replace with two magnetizing coils 17 respectively, the coiling direction of these two magnetizing coils is identical, and its direction of current is also identical.
The structure left and right directions symmetry of sensor described in the utility model.When applying a compressive stress on three giant magnetostrictive rods 6, every giant magnetostrictive rod 6 can evenly be shared this compressive stress, and its magnetic permeability is changed.Under the constant condition of mmf, corresponding variation will take place in the magnetic flux in the magnetic structure in magnetic structure, thus this compressive stress of perception.The utility model sensor can be finely tuned the size of wanting gaging pressure by the sectional area of regulating giant magnetostrictive rod.
Further feature of the present utility model is that the magnetostrictive stress sensor that designs with the utility model is an elementary cell I structure wide range sensor combinations (hereinafter to be referred as sensor combinations, referring to Fig. 3,4).The make of sensor combinations can be diversified as required.That the utility model embodiment provides only is its a kind of array mode (referring to Fig. 3,4), and it mainly comprises sensor combinations base 15; Stud component 16; Sensor elementary cell I; Force bearing plate 18; Connecting link 19 and nut 20.It specifically is configured to: the force bearing plate 18 that center has boss 21 lies on the described carrier block 9 of 4 sensor elementary cell I, and relies on connecting link 19 location; Each described sensor elementary cell I is fixed on the sensor combinations base 15 with stud component 16; The lower end of described connecting link 19 is connected with sensor combinations base 15 with screw thread, and the upper end is fixing with force bearing plate 18 with nut 20, thereby constitutes a sensor combinations integral body.During work, load is applied on the boss 21 of force bearing plate 18, thereby carrier block 9 carryings of 4 sensor elementary cell I are puted forth effort.Because structural symmetry, 4 sensor elementary cell I evenly distribute, so evenly stressed.The measured value sum of 4 sensor elementary cell I is the total measured value of sensor combinations.According to this design concept, after sensor elementary cell I of the present utility model constituted sensor combinations, suitable carrying capacity journey can be multiplied.When adopting the sectional area that increases giant magnetostrictive rod can not satisfy requiring of range extension, can adopt the appropriate combination of a plurality of sensor elementary cell I.
The utility model is not addressed part and is applicable to prior art.
Claims (2)
1. magnetostrictive stress sensor is characterized in that vertically being evenly equipped with three giant magnetostrictive rods on the interior circle of base of described sensor, and its outer ring vertical symmetry is furnished with two Permanentmagnet bars or two magnetizing coils; The upper and lower of described two Permanentmagnet bars or two magnetizing coils is separately installed with the upper conduction magnetic board of disc soft magnetic material, following magnetic conductive board, and its radius is slightly larger than the installation radius of described Permanentmagnet bar or magnetizing coil; Described two Permanentmagnet bar magnetizing directions are axially, and direction is identical; The coiling direction of described two magnetizing coils is identical, and its direction of current is also identical; The length of described Permanentmagnet bar or magnetizing coil slightly is shorter than the length of described giant magnetostrictive rod, make between the bottom surface of the end face of Permanentmagnet bar after the installation or magnetizing coil and upper conduction magnetic board and leave the space, in this space, be filled with the viscose of non-magnetic conduction, and paste fixedly Hall element therein; Be wound with inductive coil on the described giant magnetostrictive rod; Upper conduction magnetic board is installed on the carrier block by the screw combination, following magnetic conductive board is installed on the base by the bottom surface screw, outer cover is installed on the following magnetic conductive board by the side screw, and each part on the base is encapsulated as integral body, but described carrier block protrudes in the upper surface of case for packaging.
2. wide range sensor combinations, it is characterized in that it is the elementary cell structure by the described magnetostrictive stress sensor of claim 1, its concrete structure is: a force bearing plate lies on the described carrier block of a sensor elementary cell I, and relies on the connecting link location; Each sensor elementary cell is fixed on the sensor combinations base with stud component; The lower end of described connecting link is connected with the sensor combinations base with screw thread, and the upper end is fixed with nut and described force bearing plate, thereby constitutes sensor combinations integral body.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200973622U CN201184830Y (en) | 2007-09-07 | 2007-09-07 | Ultra magnetic deformation pressure sensor and the sensor combination |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200973622U CN201184830Y (en) | 2007-09-07 | 2007-09-07 | Ultra magnetic deformation pressure sensor and the sensor combination |
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| CN201184830Y true CN201184830Y (en) | 2009-01-21 |
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| CNU2007200973622U Expired - Lifetime CN201184830Y (en) | 2007-09-07 | 2007-09-07 | Ultra magnetic deformation pressure sensor and the sensor combination |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100501360C (en) * | 2007-09-07 | 2009-06-17 | 河北工业大学 | Magnetostrictive stress sensor |
| CN102025288A (en) * | 2010-11-26 | 2011-04-20 | 大连理工大学 | Giant magnetostrictive actuator with permanet torque output and control method thereof |
| CN102361144A (en) * | 2011-09-14 | 2012-02-22 | 捷考奥电子(上海)有限公司 | Double-sided butt riveting structure of circulator/isolator shell |
| CN102855763A (en) * | 2012-09-06 | 2013-01-02 | 北京交通发展研究中心 | Wireless geomagnetic vehicle detector and shell thereof |
| CN103558569A (en) * | 2013-10-30 | 2014-02-05 | 河北工业大学 | Tester for magnetic property of magnetostriction material |
| CN112051528A (en) * | 2020-08-06 | 2020-12-08 | 钢铁研究总院 | Magnetostrictive material performance testing device and method |
| CN112197692A (en) * | 2020-10-14 | 2021-01-08 | 中国航空工业集团公司北京长城计量测试技术研究所 | Dynamic strain excitation method and device |
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2007
- 2007-09-07 CN CNU2007200973622U patent/CN201184830Y/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100501360C (en) * | 2007-09-07 | 2009-06-17 | 河北工业大学 | Magnetostrictive stress sensor |
| CN102025288A (en) * | 2010-11-26 | 2011-04-20 | 大连理工大学 | Giant magnetostrictive actuator with permanet torque output and control method thereof |
| CN102025288B (en) * | 2010-11-26 | 2013-08-28 | 大连理工大学 | Giant magnetostrictive actuator with permanet torque output and control method thereof |
| CN102361144A (en) * | 2011-09-14 | 2012-02-22 | 捷考奥电子(上海)有限公司 | Double-sided butt riveting structure of circulator/isolator shell |
| CN102361144B (en) * | 2011-09-14 | 2016-08-03 | 捷考奥电子(上海)有限公司 | The two-sided docking riveted construction of circulator/isolator shell |
| CN102855763A (en) * | 2012-09-06 | 2013-01-02 | 北京交通发展研究中心 | Wireless geomagnetic vehicle detector and shell thereof |
| CN103558569A (en) * | 2013-10-30 | 2014-02-05 | 河北工业大学 | Tester for magnetic property of magnetostriction material |
| CN103558569B (en) * | 2013-10-30 | 2015-12-23 | 河北工业大学 | A kind of tester for magnetic property of magnetostriction material |
| CN112051528A (en) * | 2020-08-06 | 2020-12-08 | 钢铁研究总院 | Magnetostrictive material performance testing device and method |
| CN112051528B (en) * | 2020-08-06 | 2021-11-02 | 钢铁研究总院 | Magnetostrictive material performance testing device and method |
| CN112197692A (en) * | 2020-10-14 | 2021-01-08 | 中国航空工业集团公司北京长城计量测试技术研究所 | Dynamic strain excitation method and device |
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| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20070907 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |