CN203191135U - Spoke-type parallel piezoelectric six-dimensional force sensor - Google Patents
Spoke-type parallel piezoelectric six-dimensional force sensor Download PDFInfo
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- CN203191135U CN203191135U CN 201320177952 CN201320177952U CN203191135U CN 203191135 U CN203191135 U CN 203191135U CN 201320177952 CN201320177952 CN 201320177952 CN 201320177952 U CN201320177952 U CN 201320177952U CN 203191135 U CN203191135 U CN 203191135U
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Abstract
The utility model discloses a spoke-type parallel piezoelectric six-dimensional force sensor. The spoke-type parallel piezoelectric six-dimensional force sensor comprises an upper cover and a lower cover, and is characterized in that an annular groove I is formed in the lower surface of the upper cover; symmetrical conductive wire holes are formed in the lower surface of the upper cover; eight groups of spokes I are uniformly distributed in the same circle, on the upper cover; a square groove II is formed in one lower surface of each spoke; eight groups of spokes II are uniformly distributed in the same circle, on the lower cover; a groove III symmetrical with the groove II is formed in the upper surface of each spoke II; force-sensitive components are placed on the three upper surfaces of each groove; the upper surfaces of the force-sensitive components are contacted with the surface of the groove II; a hollow screw is installed in each conductive wire hole; four screw holes I which are uniformly distributed in the same circle are symmetrically formed in the upper cover and the lower cover respectively; and four pre-tensioning screws penetrate through the screw holes I to install the upper cover, the force-sensitive components and the lower cover together. The spoke-type parallel piezoelectric six-dimensional force sensor disclosed by the utility model is good in manufacturability, good in stability, easy to manufacture, long in life, simple to operate, convenient to use, and low in cost.
Description
Technical field
The utility model relates to the utility model and belongs to sensor and measurement and control area thereof, particularly a kind of radial parallel piezoelectric six-dimension force sensor.
Background technology
At present, piezoelectric type hexa-dimensional force sensor is that a kind of intelligent piezo material that utilizes is as the dynamic dynamometry form of force sensing element.The piezoelectric effect theory is the key problem of piezoelectricity section research with applied basic research always.The principal feature of piezoelectric sensor is that it has very high natural frequency, is particularly suitable for kinetic measurement, and the piezoelectric type measurement is unique measuring technique that satisfies the high natural frequency requirement.Piezoelectric type hexa-dimensional force sensor generally needs the quartzy brilliant group of many groups to detect sextuple generalized force respectively, the reasonable Arrangement of quartzy brilliant group is the key of sensor design, and how to overcome sensor each is the effective way that improves the piezoelectric sensor measuring accuracy to the phase mutual interference between load.
The disclosed integral pretightened flat bed type six-dimensional force transducer of Chinese patent CN1263259, its structure is on traditional stewart platform structure, between the lower platform, pretension branch road in the middle of setting up one, utilize in this pretension branch road tension, lower platform, sensor is carried out integral pre-tightening, while each ball pair of pretension, eliminate the gap, improve the integral rigidity of sensor, yet total is by middle pretension branch road pretension sealing, and required pretightning force is bigger, and pretension props up comparatively complexity of line structure, be difficult to guarantee that it bears the acting force along axis direction, make measuring accuracy be affected.
Among patent CN101013054 " differential type piezo-electric six-dimensional sensing unit " and the CN101750173A " a kind of piezoelectric type hexa-dimensional force sensor ", at force transmission mechanism eight or two multidimensional piezoelectric force transducers are installed, outer force information is applied directly on each sensor by force transmission mechanism, avoided the influence of elastic body to sensor, there is not coupling between dimension, technology is simple, but this class six-dimension force sensor requires height to the installation accuracy of each sensor, and the consistance of same model sensor is also had relatively high expectations.
Disclose a kind of piezoelectric six-dimensional large force sensor among the patent CN101149300, this structure sensor can be realized the sextuple power kinetic measurement of wide range, and it adopts the Stewart structure, has the problem of decoupling zero difficulty, and volume is big, and very high to the installation requirement precision.Disclose a kind of three-dimensional force integrally assembled type six-dimensional force cell sensor among the patent CN101149299, this structure sensor construction is simple, adjustment is easy for installation, energy measurement space six-dimension heavy force, but complex structure, decoupling zero difficulty.
Patent CN101149301 " large value piezoelectric quartz multi-component force sensor ", among CN202153166U " a kind of parallel piezoelectric six-dimensional heavy force sensor " and the CN101793574A " piezoelectric type six-dimensional force sensor with adjustable load sharing ratio and method of testing thereof ", all be to adopt 4 groups of piezoelectric quartz wafers as force sensing element, can realize the kinetic measurement of wide range load, but there is coupling between power and the moment, force sensing element both had been used for dynamometry, also be used for the dynamometry square, though can carry out decoupling zero through software for calculation calculates, but can not realize non-coplanar force is carried out direct decoupling, especially when measuring wide range load, volume and weight is bigger, and processing cost is also higher.
The utility model content
The technical problems to be solved in the utility model provides a kind of radial parallel piezoelectric six-dimension force sensor, technological performance, reliable operation, be easy to install and maintenance, the coupling coefficient of being convenient to promote the use of is little, highly sensitive, Strong decoupling zero, high rigidity, measure the radial parallel piezoelectric six-dimension force sensor of range greatly.
The utility model adopts following technological means to realize the utility model purpose:
A kind of radial parallel piezoelectric six-dimension force sensor, comprise loam cake (1) and lower cover (3), it is characterized in that: have annular loam cake groove (c) on the loam cake lower surface (a) of described loam cake (1), have on the lower cover upper surface of described lower cover (3) (a ') and the lower cover groove of described loam cake groove (c) symmetry (c '), have the wire guide (14) of symmetry on the described loam cake lower surface (a), have the wire guide (15) of symmetry on the described lower cover upper surface (a '), cover on described with circle and be evenly equipped with eight groups of spokes one (12), have square groove two (d) on described each spoke one (12) lower surface, described lower cover (3) is gone up with circle and is evenly equipped with eight groups of spokes two (13), have on described each spoke two (13) upper surface and the groove three of described groove two (d) symmetry (d '), described each groove three (d ') upper surface is placed with force sensing element (2), the upper surface of described force sensing element (2) contacts with groove two (d) surface, hollow screw (4) is installed in described each wire guide (14), described loam cake (1) and lower cover (3) are symmetrically arranged with 4 respectively with the uniform screw hole one (8) of circle, and 4 pretension screws one (6) pass screw hole one (8) with described loam cake (1), force sensing element (2), lower cover (3) is installed together.
As the further restriction to the technical program, have 8 on described groove two (d) surface (e) with the uniform screw hole two (10) of circle, have 8 on described groove three (d ') upper surface (e ') with circle uniform through hole (17), by through hole (17) force sensing element (2) is applied pretightning force with 8 pretension screws (7).
As the further restriction to the technical program; have 4 threaded holes one (9) on the upper surface (b) of described loam cake (1); be used for installing and fixing measured piece; have threaded hole two (11) on the lower surface (b ') of described lower cover (3); be used for installing and fixing sensor; the inwall (g) of described loam cake (1) and the inwall (g ') of lower cover (3) play load sharing and protective effect, can realize different load sharing ratios by the thickness of regulating inwall (g), (g ').
As the further restriction to the technical program, described force sensing element comprises s
0, s
1, s
2, s
3, s
4, s
5, s
6, s
78 groups of force sensing elements, wherein s
0, s
2, s
4, s
6Totally 4 groups of force sensing elements layout that assumes diamond in shape is positioned at coordinate system one XOY, is used for measurement space three-dimensional force F
x, F
y, F
zWherein every group of force sensing element is made up of Y0 ° of cut type wafer one (22), pad one (18), electrode slice one (19), electrode slice two (20) that two one (21), four of X0 ° of cut type wafers that bear the tension and compression effect bear shearing effect, wherein electrode slice one (19) is used for ground connection, electrode slice two (20) is used for output relevant voltage signal, s
1, s
3, s
5, s
7Totally 4 groups of force sensing elements layout that assumes diamond in shape is positioned at coordinate system two X ' OY ', is used for measurement space three-dimensional moment M
x, M
y, M
zWherein every group of force sensing element is made up of four X0 ° of cut type wafers two (21 ') that bear the tension and compression effect, two the Y0 ° of cut type wafers two (22 ') that bear shearing effect, pad two (18 ') and electrode slices three (19 ') and electrode slice four (20 '), wherein electrode slice three (19 ') is used for ground connection, electrode slice four (20 ') is used for output relevant voltage signal and forms, and coordinate system one XOY and coordinate system two X ' OY ' are coplanar and be 45 ° of angles.
Compared with prior art, advantage of the present utility model and good effect are: 8 brace type parallel piezoelectric six-dimension force sensors of the present utility model have higher static state and dynamic property, and sensor does not need that the output signal of force sensing element is carried out complicated decoupling zero computing just can obtain exporting the result.Because simple in structure, so the cost of this sensor reduces greatly, it has higher power-photoelectric transformation efficiency, can measure static force, dynamic force and transient force.This sensor can be used for the sextuple force measurement in space on the face of series system, and the axle that also can be used for parallel way is gone up the sextuple force measurement in space, and is of many uses.By changing the thickness of an ancient piece of jade, round, flat and with a hole in its centre in sensor loam cake and the lower cover, realize different load sharing ratios, reach the effect of measuring different range ability power.This sensor construction is simple, symmetry good, good rigidly, good manufacturability, good stability, easy to manufacture, the life-span is long, and is simple to operate, easy to use, cost is low, highly sensitive, be easy to decoupling zero, be easy to commercialization, laterally disturb little.Can be used for going up sextuple static force, dynamic force, the transient state force measurement that dual mode is subjected to range changing with axle on the face, also can be used as on-Line Monitor Device or adaptive control system feedback element.
Description of drawings
Fig. 1 is radial parallel piezoelectric six-dimension force sensor structural representation.
Fig. 2 is the upward view of loam cake.
Fig. 3 is the vertical view of loam cake.
Fig. 4 is the vertical view of lower cover.
Fig. 5 is the upward view of lower cover.
Fig. 6 is the work three-dimensional cartesian coordinate system of sensor in the utility model and the local coordinate system figure of each quartzy brilliant group.
Fig. 7 is s
0, s
2, s
4, s
6The force sensing element structural representation.
Fig. 8 is s
1, s
3, s
5, s
7The force sensing element structural representation.
Fig. 9 is radial parallel piezoelectric six-dimension force sensor assembling synoptic diagram.
Among the figure: 1-loam cake, 2-force sensing element, 3-lower cover, 4-hollow screw, 5,5 '-lead, 6-pretension screw one, 7-pretension screw two, 8-screw hole one, 9-threaded hole one, 10-screw hole two, 11-threaded hole two, 12-spoke one, 13-spoke two, 14-wire guide, 17-through hole, 18-pad one, 19-electrode slice one, 20-electrode slice two, 21-X0 ° of cut type wafer one, 22-Y0 ° of cut type wafer one, 18 '-pad two, 19 '-electrode slice three, 20 '-electrode slice four, 21 '-X0 ° cut type wafer two, 22 '-Y0 ° cut type wafer two, a-loam cake lower surface, a '-lower cover upper surface, b-loam cake upper surface, b '-lower cover lower surface, c-loam cake groove, c '-lower cover groove, d-groove two, d '-groove three, e-groove two surfaces, e '-groove three upper surfaces, f-force sensing element upper surface, g-loam cake inwall, g '-lower cover inwall, s
0, s
1, s
2, s
3, s
4, s
5, s
6, s
7-8 groups of force sensing elements.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment the utility model is done further to describe in detail.
Referring to Fig. 1-Fig. 9, the utility model comprises loam cake 1 and lower cover 3, have toroidal cavity one c on the loam cake lower surface a of described loam cake 1 described loam cake 1, have the wire guide 14 of symmetry on the described loam cake lower surface a, cover on described with circle and be evenly equipped with eight groups of spokes 1, have square groove two d on described each spoke one 12 lower surface, be evenly equipped with eight groups of spokes 2 13 with circle on the described lower cover 3, have groove three d ' with described groove two d symmetries on described each spoke 2 13 upper surface, described each groove three d ' upper surface are placed with force sensing element 2, the upper surface of described force sensing element 2 contacts with groove two d surface, in described each wire guide 14 hollow screw 4 is installed, described loam cake 1 and lower cover 3 are symmetrically arranged with 4 respectively with the uniform screw hole one (8) of circle, and 4 pretension screws 6 pass screw hole 1 with described loam cake 1, force sensing element 2, lower cover 3 is installed together.
Have 8 with the uniform screw hole 2 10 of circle on the described groove two d surface e, have 8 on the described groove three d ' upper surface e ' with the uniform through hole 17 of circle, by hole 17 force sensing element (2) is applied pretightning force with 8 pretension screws 7.
Have 4 threaded holes 1 on the upper surface b of described loam cake 1; be used for installing and fixing measured piece; have threaded hole 2 11 on the lower surface b ' of described lower cover 3; be used for installing and fixing sensor; the inwall g of described loam cake 1 and the inwall g ' of lower cover 3 play load sharing and protective effect, can realize different load sharing ratios by the thickness of regulating inwall g, g '.
Described force sensing element comprises s
0, s
1, s
2, s
3, s
4, s
5, s
6, s
78 groups of force sensing elements, wherein s
0, s
2, s
4, s
6Totally 4 groups of force sensing elements layout that assumes diamond in shape is positioned at coordinate system one XOY, is used for measurement space three-dimensional force F
x, F
y, F
zWherein every group of force sensing element by two bear X0 ° of cut type wafer 1 of tension and compression effect, four Y0 ° of cut type wafer 1, pad 1, electrode slice 1, electrode slices 2 20 that bear shearing effect are formed, wherein electrode slice 1 is used for ground connection, electrode slice 2 20 is used for the corresponding voltage signal of output, s
1, s
3, s
5, s
7Totally 4 groups of force sensing elements layout that assumes diamond in shape is positioned at coordinate system two X ' OY ', is used for measurement space three-dimensional moment M
x, M
y, M
zWherein every group of force sensing element by four X0 ° of cut type wafers 2 21 that bear the tension and compression effect ', two Y0 ° of cut type wafers 2 22 that bear shearing effect ', pad 2 18 ' and electrode slice 3 19 ' and electrode slice 4 20 ' form, electrode slice 3 19 ' be used for ground connection wherein, electrode slice 4 20 ' be used for the corresponding voltage signal of output to form, coordinate system one XOY and coordinate system two X ' OY ' are coplanar and be 45 ° of angles.
The material of loam cake 1, lower cover 3 is 304 stainless steels.During installation, earlier 8 groups of force sensing elements 2 are evenly arranged in according to sensitive direction on 8 grooves d of lower cover 3, guarantee that the lower surface of force sensing element 2 cooperates with the upper surface e ' of grooves d, the coordinate of sensor is one, 4 group of force sensing element s of coordinate system
0, s
2, s
4, s
6Sensitive direction must be consistent 4 groups of force sensing element s with the coordinate system of sensor
1, s
3, s
5, s
7Sensitive direction must with the coordinate system of sensor angle at 45,4 groups of force sensing element s
0, s
2, s
4, s
6Lead by hole 14,14 ' derivation, 4 groups of force sensing element s
1, s
3, s
5, s
7Lead by hole 15,15 ' derivation.Loam cake 1 is installed then, by 4 pretension screws 6 with loam cake 1, hollow screw 4, hollow screw 4 ', lower cover 3 links together by hole 16, by hole 17 force sensing element (2) is applied and regulates pretightning force with 8 pretension screws 7, the pretightning force scope is 1000N～30000N, the upper surface f that guarantees force sensing element 2 contacts with grooves d surface e, the lower surface a of loam cake 1 contacts with the upper surface a ' of lower cover 3, by changing loam cake inwall g, the wall thickness of lower cover inwall g ', can realize the load sharing ratio that parallel-connection structure is different, sensor is carried out after connect in parallel uses, can obviously improve the dynamometry range ability of sensor, the dynamometry range ability is that axial force is 100N～1000000N, and transverse force is 100N～100000N.Have 4 threaded holes 9 on the upper surface b of loam cake 1, be used for installing and fixing measured piece, have threaded hole 11 on the lower surface b ' of lower cover 3, be used for installing and fixing sensor.
When the sensor loam cake was stressed, the elastic link (inwall g and spoke 12) by the sensor loam cake acted on 8 force sensing elements 2, four groups of brilliant group s of rhombus layout
0, s
2, s
4, s
6Acting force decomposed automatically and produce the corresponding quantity of electric charge through one group of tension and compression effect, two groups of shearing effects, through charge amplifier amplify become corresponding voltage signal after, respectively with voltage [V
X0, V
X2, V
X4, V
X6], [V
Y0, V
Y2, V
Y4, V
Y6], [V
Z0, V
Z2, V
Z4, V
Z6] output, four groups of brilliant group s of rhombus layout
1, s
3, s
5, s
7Acting force decomposed automatically and produce the corresponding quantity of electric charge through two groups of tension and compression effects, one group of shearing effect, through charge amplifier amplify become corresponding voltage signal after, respectively with voltage [V
X1, V
X3, V
X5, V
X7], [V
Z1, V
X3, V
Z5, V
Z7], [V
Z1', V
Z3', V
Z5', V
Z7'] output, by signal condition and A/D data collecting card simulating signal is become digital signal input computing machine, handle drawing each major parameter of space vector power by the computing machine corresponding software, and demonstration, record, printing etc.For guaranteeing that each to a minimum principle of horizontal interference, needs accurately debugging the installation site of 8 groups of force sensing elements 2, make 8 groups of force sensing elements 2 be uniformly distributed in radius to be during assembling
Circle on.So when external force acted on application of force platform center, this six-dimension force sensor was output as:
In the formula, the d denotation coordination is force sensing element s among the XOY
0, s
2, s
4Perhaps s
6The distance of distance X axle or Y-axis, according to above analysis as can be seen, this sensor does not need that the output signal of force sensing element is carried out complicated decoupling zero computing just can obtain exporting the result.The utility model is undertaken full decoupled by 8 groups of force sensing elements, come to go up sextuple static force, dynamic force, the transient force that dual mode is subjected to range changing with axle on the measurement face, also can be used as on-Line Monitor Device or adaptive control system feedback element, good rigidity, highly sensitive, cost is low, be easy to commercialization, its method of testing is simple to operate, esy to use, safe and reliable.
Certainly; above-mentioned explanation is not to restriction of the present utility model; the utility model also is not limited only to above-mentioned giving an example, and the variation that those skilled in the art make in essential scope of the present utility model, remodeling, interpolation or replacement also belong to protection domain of the present utility model.
Claims (4)
1. radial parallel piezoelectric six-dimension force sensor, comprise loam cake (1) and lower cover (3), it is characterized in that: have annular loam cake groove (c) on the loam cake lower surface (a) of described loam cake (1), have on the lower cover upper surface of described lower cover (3) (a ') and the lower cover groove of described loam cake groove (c) symmetry (c '), have the wire guide (14) of symmetry on the described loam cake lower surface (a), have the wire guide (15) of symmetry on the described lower cover upper surface (a '), cover on described with circle and be evenly equipped with eight groups of spokes one (12), have square groove two (d) on described each spoke one (12) lower surface, described lower cover (3) is gone up with circle and is evenly equipped with eight groups of spokes two (13), have on described each spoke two (13) upper surface and the groove three of described groove two (d) symmetry (d '), described each groove three (d ') upper surface is placed with force sensing element (2), the upper surface of described force sensing element (2) contacts with groove two (d) surface, hollow screw (4) is installed in described each wire guide (14), described loam cake (1) and lower cover (3) are symmetrically arranged with 4 respectively with the uniform screw hole one (8) of circle, and 4 pretension screws one (6) pass screw hole one (8) with described loam cake (1), force sensing element (2), lower cover (3) is installed together.
2. radial parallel piezoelectric six-dimension force sensor according to claim 1, it is characterized in that: have 8 on groove two surfaces (e) of described groove two (d) with the uniform screw hole two (10) of circle, have 8 on groove three upper surfaces (e ') of described groove three (d ') with circle uniform through hole (17), by through hole (17) force sensing element (2) is applied pretightning force with 8 pretension screws two (7).
3. radial parallel piezoelectric six-dimension force sensor according to claim 1; it is characterized in that: have 4 threaded holes one (9) on the upper surface (b) of described loam cake (1); be used for installing and fixing measured piece; have threaded hole two (11) on the lower surface (b ') of described lower cover (3); be used for installing and fixing sensor; the inwall (g) of described loam cake (1) and the inwall (g ') of lower cover (3) play load sharing and protective effect, can realize different load sharing ratios by the thickness of regulating inwall (g), (g ').
4. radial parallel piezoelectric six-dimension force sensor according to claim 1, it is characterized in that: described force sensing element (2) comprises s
0, s
1, s
2, s
3, s
4, s
5, s
6, s
78 groups of force sensing elements, wherein s
0, s
2, s
4, s
6Totally 4 groups of force sensing elements layout that assumes diamond in shape is positioned at coordinate system one XOY, is used for measurement space three-dimensional force F
x, F
y, F
zWherein every group of force sensing element is made up of Y0 ° of cut type wafer one (22), pad one (18), electrode slice one (19), electrode slice two (20) that two one (21), four of X0 ° of cut type wafers that bear the tension and compression effect bear shearing effect, wherein electrode slice one (19) is used for ground connection, electrode slice two (20) is used for the corresponding voltage signal of output, s
1, s
3, s
5, s
7Totally 4 groups of force sensing elements layout that assumes diamond in shape is positioned at coordinate system two X ' OY ', is used for measurement space three-dimensional moment M
x, M
y, M
zWherein every group of force sensing element is made up of four X0 ° of cut type wafers two (21 ') that bear the tension and compression effect, two the Y0 ° of cut type wafers two (22 ') that bear shearing effect, pad two (18 ') and electrode slices three (19 ') and electrode slice four (20 '), wherein electrode slice three (19 ') is used for ground connection, electrode slice four (20 ') is used for the corresponding voltage signal of output, and coordinate system one XOY and coordinate system two X ' OY ' are coplanar and be 45 ° of angles.
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|---|---|---|---|
| CN 201320177952 CN203191135U (en) | 2013-04-10 | 2013-04-10 | Spoke-type parallel piezoelectric six-dimensional force sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320177952 CN203191135U (en) | 2013-04-10 | 2013-04-10 | Spoke-type parallel piezoelectric six-dimensional force sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196594A (en) * | 2013-04-10 | 2013-07-10 | 济南大学 | Spoke type parallel piezoelectricity six-dimensional force sensor and measuring method |
| CN104677543A (en) * | 2015-01-29 | 2015-06-03 | 重庆大学 | Piezoelectric type six-dimensional force/torque sensor adopting six groups of force-measuring sensitive units |
| CN105910750A (en) * | 2016-04-11 | 2016-08-31 | 沈阳工业大学 | Pumping device impeller dynamic circumference vector force measuring device and method |
| CN107300433A (en) * | 2017-06-19 | 2017-10-27 | 重庆大学 | A kind of method that utilization piezoelectric force transducer measures static force |
| CN107471085A (en) * | 2017-09-17 | 2017-12-15 | 长春工业大学 | Six-dimensional force device for measuring force and force measuring method based on viscoelastic material polishing |
-
2013
- 2013-04-10 CN CN 201320177952 patent/CN203191135U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196594A (en) * | 2013-04-10 | 2013-07-10 | 济南大学 | Spoke type parallel piezoelectricity six-dimensional force sensor and measuring method |
| CN103196594B (en) * | 2013-04-10 | 2015-09-09 | 济南大学 | A kind of spoke type parallel piezoelectricity six-dimensional force sensor and measuring method |
| CN104677543A (en) * | 2015-01-29 | 2015-06-03 | 重庆大学 | Piezoelectric type six-dimensional force/torque sensor adopting six groups of force-measuring sensitive units |
| CN104677543B (en) * | 2015-01-29 | 2019-11-29 | 重庆大学 | Using piezoelectric six-dimension power/torque sensor of 6 groups of dynamometry sensing units |
| CN105910750A (en) * | 2016-04-11 | 2016-08-31 | 沈阳工业大学 | Pumping device impeller dynamic circumference vector force measuring device and method |
| CN107300433A (en) * | 2017-06-19 | 2017-10-27 | 重庆大学 | A kind of method that utilization piezoelectric force transducer measures static force |
| CN107300433B (en) * | 2017-06-19 | 2019-12-03 | 重庆大学 | A method of static force is measured using piezoelectric force transducer |
| CN107471085A (en) * | 2017-09-17 | 2017-12-15 | 长春工业大学 | Six-dimensional force device for measuring force and force measuring method based on viscoelastic material polishing |
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| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130911 Effective date of abandoning: 20150909 |
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| RGAV | Abandon patent right to avoid regrant |