CN101532817B - Resistance strain gauge and sensor using resistance strain gauge to change stress transfer mode - Google Patents
Resistance strain gauge and sensor using resistance strain gauge to change stress transfer mode Download PDFInfo
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- CN101532817B CN101532817B CN2009100801899A CN200910080189A CN101532817B CN 101532817 B CN101532817 B CN 101532817B CN 2009100801899 A CN2009100801899 A CN 2009100801899A CN 200910080189 A CN200910080189 A CN 200910080189A CN 101532817 B CN101532817 B CN 101532817B
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Abstract
The invention discloses a resistance strain gauge and a sensor using the resistance strain gauge to change the stress transfer mode, comprising the arrangement mode of a sensitive grid and a bonding pad in the resistance strain gauge which changes the stress skew symmetric transfer mode of a bridge type shear beam shape sensor, the sensor using the resistance strain gauge to change the stress transfer mode comprises a resistance strain gauge arranged at the two sides of an elastic body which is symmetric in the directions of front, rear, left and right, the elastic body is seated at a bearing base, a steel ball is arranged above the elastic body and seated in a steel protective sleeve; a pressure head is further arranged above the steel ball; and the two sides of the upper part of the elastic body are provided with fastening parts which fix the elastic body and the base into an integration. The invention not only solves the problems that uneasy control of measurement precision, high requirement of process assembly and the like which exist in the prior cantilever shear beam sensors, and greatly improves the measurement precision of the shear beam sensor of the category and reduces the production cost.
Description
Technical field
The present invention relates to a kind of a kind of follow-on strain that can measure the mechanical measurement of power that the outside applies and weight takes into account the simple shear that utilizes this strainometer to form and cuts beam type and double-shear beam sensor.
Background technology
Strain gauge transducer is based on a kind of sensor of Measuring Object strain that stress deformation produces, and is mainly used in the measurement of mechanical quantities such as power, acceleration, pressure, moment.Strain gauge transducer is pasted on surface of elastomer with strainometer or directly strainometer is pasted on the test specimen; The distortion of elastic body or test specimen passes to the sensitive grid of strainometer through substrate and cementing agent; The corresponding variation takes place in its resistance value; Convert voltage or change in current into through change-over circuit, can measure strain.If through the strain that measures being converted to physical quantitys such as the displacement that is applied on elastic body or the test specimen, power, moment, acceleration, pressure, then can measure above-mentioned each amount, process various strain gauge transducers.The most popular sensing element of strain gauge transducer is a strain ga(u)ge.
Strain ga(u)ge; It measures the principle of strain; Mainly be the distortion of borrowing elastic body or test specimen, cause the variation that sticks on elastic body or the lip-deep strain ga(u)ge resistance value of test specimen, the rate of change dR/R of resistance value and the strain dl/l relation between the two: dR/R=Kdl/l; Wherein, K is called the sensitivity coefficient of strain ga(u)ge.Foil strain gauge is owing to have: 1. the metal forming grid are thin, and the strain regime of strain regime and elastic body or test specimen is approaching, and strain effect is obvious, and measuring accuracy is higher; 2. radiating condition is good, allows electric current big, highly sensitive; 3. transversal effect is little; 4. can be made into multiple complicated shape, true-to-size sensitive grid, to adapt to different measurement requirement; 5. creep and mechanical hysteresis are little, and fatigue lifetime is long; 6. production efficiency is high, is convenient to realize that advantage such as automated production is widely used.Two axial strain meters of two 45 degree that existing typical cut mode is stressed are as shown in Figure 1; In load when the axis direction of beam has skew; During the strainometer unbalance stress that in the past used; Particularly when the time spent of doing that elastic body receives side load, sensitive grid 11a of strainometer can produce tes signal output by torsional deformation on it, causes measuring error; It has directly influenced the raising of the non-linear of shear beam type sensor and lag performance index.Deformation takes place in the sensitive grid 11a of strainometer easily, influences the performance of sensor, for example the nonlinearity of sensor, sluggishness etc.
First problem of two axial strain meters of conventional two 45 degree that shear beam type sensor of the prior art uses relates to that unbalance loading causes unbalance stress in the mechanical measurement process, causes the distortion that is distorted of the sensitive grid of strainometer, influences the measuring accuracy of strainometer.Cause the discreteness of test result to increase.
Second problem of the strainometer arrangement mode that shear beam type sensor of the prior art is used relates to sensor and with elastic body material required height, and rejection rate is high in the process;
The 3rd problem of the strainometer arrangement mode that shear beam type sensor of the prior art is used relates to sensor performance.The such dynamometry that the common shearing strainometer of most of employing is processed and the non-linear and lagging indicator of LOAD CELLS all are difficult to reach in the 0.03%FS.
Summary of the invention
For solving above-mentioned middle problem and the defective that exists, the invention provides a kind of strain and take into account dynamometry and the LOAD CELLS that utilizes strain gauge to change stress transfer mode.
The present invention realizes through following technical scheme:
A kind of strain ga(u)ge involved in the present invention comprises:
Comprise two groups of sensitive grids and four pads, four pads on the said strain ga(u)ge sensitive grid are arranged on a side of sensitive grid, and its two groups of sensitive grids and four pads are arranged in the same substrate of said strainometer.
Said two resistance sensitive grids axially become 45 degree and 135 degree respectively with X direction, and two resistance sensitive grids axially each other vertical forms the 90 two axial strain meters of spending; The medial axis left-right symmetric of said two resistance sensitive grids, and each resistance sensitive grid is through dot center's symmetry among self axially parallel cornerwise.
Said strainometer is applicable to measure shear stress or be used for simple shear cuts beam type and double-shear beam sensor.
Said strainometer can be semibridge system combination or full-bridge type combination.
The single armed resistance of said strainometer is between 100-2000 ohm.
A kind of sensor that utilizes resistance strain gauge to change stress transfer mode involved in the present invention comprises:
Said sensor comprises: strain ga(u)ge, elastic body, seaming chuck, steel ball and steel ball sheath, said strain ga(u)ge are arranged on the said elastomeric both sides of symmetry all around; Said elastic body is seated on the load base; Said seaming chuck is arranged on the top of steel ball; Said steel ball is seated in the steel ball sheath and is arranged on elastomeric top; Two surveys of said elastic body top also are respectively arranged with secure component is fixed as one elastic body and load base.
Said sensor is that simple shear is cut beam type and double-shear beam type dynamometry and LOAD CELLS, and is provided with two pieces of strainometers on each dynamometry and the LOAD CELLS at least.
The said strainometer arrangement mode that is arranged on dynamometry and the LOAD CELLS is along left-right symmetric on the vertical pivot center of effort line; Be symmetry up and down along the transverse axis center line; When it is arranged on strainometer quantity on dynamometry and the LOAD CELLS greater than two, then include two pieces of strainometer and two pieces of strainometers that the wire grid that is stressed shortens that receive the elongation of pulling force wire grid at least; The said strainometer of pulling force wire grid elongation and the strainometer that the wire grid that is stressed shortens of receiving constitutes the Performance Detection that Wheatstone bridge is used for signal.
Said sensor can reduce the influence of lateral tilt load to sensor performance.
The beneficial effect of technical scheme provided by the invention is:
1. reduce the irregular deformation that elastomeric distortion irregular deformation under the deflection load-bearing stress situation causes the sensitive grid of strainometer, improved the measuring accuracy of sensor.
2. should invent the strainometer force way that proposes, and not only make elastic body be easy to process, reduce the rejection rate in the processing.And greatly reduce the requirement of elastic body to material.
Above-mentioned beneficial effect has not only reduced cost, and has improved the performance of sensor, is with a wide range of applications.
Description of drawings
Fig. 1 is the strain gauge structure figure that prior art provides;
Fig. 2 is strain gauge structure figure provided by the invention;
Fig. 3 is dynamometry and LOAD CELLS agent structure view;
Fig. 4 and 4a are strain gauge structure constitutional diagram on dynamometry and LOAD CELLS and this sensor;
Fig. 5 and 5a are strain gauge structure constitutional diagram on dynamometry and LOAD CELLS and this sensor;
Fig. 6 is dynamometry and the LOAD CELLS sectional elevation with strainometer;
Fig. 7 is dynamometry and the LOAD CELLS side view with strainometer;
Fig. 8 pastes synoptic diagram for each strainometer on dynamometry and the LOAD CELLS receives force direction;
Fig. 9 is the bridge diagram schematic diagram of dynamometry and LOAD CELLS.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below:
Present embodiment provides a kind of strainometer, and a kind of double shear cut strain ga(u)ge is counted in this strain.
Referring to Fig. 2, said strainometer comprises: four pad 12a of the extension line of substrate 1a, two groups of resistance sensitive grid 11a and resistance sensitive grid.Two pieces of resistance sensitive grid 11a are arranged in the same substrate of strainometer, and four pad 12a are arranged on the side of resistance sensitive grid 11a.
Two resistance sensitive grids axially become 45 degree and 135 degree respectively with X direction, and two axially each other vertical 90 two axial strain meters of spending that form; The medial axis of two resistance sensitive grids is the left-right symmetric shape, and each resistance sensitive grid is respectively about dot center's symmetry among axially parallel cornerwise of each.The resistance value of every group of sensitive grid of said strainometer is between 100-2000 ohm; Strainometer can be semibridge system combination or full-bridge type combination, and can be applicable to measure shear stress or be used for simple shear and cut beam type and double-shear beam type dynamometry and LOAD CELLS.
Present embodiment provides a kind of sensor that changes stress transfer mode, and this sensor is dynamometry and the LOAD CELLS that utilizes resistance strain gauge to change stress transfer mode.
Referring to Fig. 3; Be dynamometry and LOAD CELLS agent structure; Comprise strainometer 1, elastic body 2, seaming chuck 3, steel ball 4 and steel ball sheath 5, said strainometer 1 is arranged in the said elastic body 2, and this elastic body 2 is seated on the elastic body base 7; Said steel ball 4 is arranged on the top of elastic body 2, and this steel ball 4 is seated in the steel ball sheath 5; The top of said steel ball 4 also is provided with a seaming chuck 3; The both sides of said elastic body top also are respectively arranged with secure component is fixed as one elastic body 2 and base 7.
Can comprise that four pieces of strainometers (referring to Fig. 3) also can include many pieces of strainometers on dynamometry and the LOAD CELLS, the arrangement mode of strainometer is a left-right symmetric on the vertical pivot center of effort line on the sensor, and the transverse axis center line is symmetry up and down.If when comprising four pieces or many pieces of strainometers on dynamometry and the LOAD CELLS, the strainometer that then has at least two pieces of strainometers that receive the elongation of pulling force wire grid and two pieces of wire grids that are stressed to shorten forms that Wheatstone bridge is used for dynamometry and the LOAD CELLS test signal is exported.The arrangement of strainometer stickup force way not only is suitable for double-shear beam type dynamometry and weighing apparatus on dynamometry and the LOAD CELLS, also is suitable for simple shear beam type dynamometry and LOAD CELLS simultaneously.
Referring to Fig. 4, Fig. 4 a and Fig. 5 and Fig. 5 a; Be the dynamometry with strainometer and the configuration state of load cell structure synoptic diagram and strainometer; Shear beam type dynamometry and LOAD CELLS and adopt 4 pieces of strainometers to be installed on the web between the blind hole of elastic body both sides, be used to measure and be applied to the strain that the load on the seaming chuck causes.Strainometer on the sensor is installed on the midsection of beam length (cross section E-E or cross section F-F); Make the transverse axis center line (cross section G-G) on the neutral line of beam of strainometer simultaneously; Wherein, The wire grid of strainometer becomes 45 degree with central core, if the pad that is arranged on the strainometer 1 on the web front down, then the pad of strainometer 1 is up (referring to Fig. 5 and Fig. 5 a) on the web reverse side.
Referring to Fig. 6; Be the dynamometry with strainometer and the cross-sectional TV structure of LOAD CELLS; Strainometer 1 is positioned on the web between the blind hole of elastic body 2 both sides; If be positioned at the positive strainometer 1 of web and be Fig. 6 middle and upper part strainometer 1 pad down, the strainometer 1 that then is positioned at the web reverse side be Fig. 6 bottom strainometer 1 pad up.The elastic body 2 that is provided with strainometer 1 is fixed on the elastic body base 7.Can see simultaneously through the side of dynamometry and sensor and to be positioned at web front pad strainometer 1 down and to be positioned at web reverse side pad strainometer 1 (referring to Fig. 7) up.
The bridge diagram of shearing beam type dynamometry and LOAD CELLS referring to Fig. 8, Fig. 9 adopts wheatstone bridge, sensitive grid R5, R6, R7 and the R8 of front strainometer, sensitive grid R1, R2, R3 and the R4 of reverse side strainometer; Wherein, sensitive grid R1, R3, R5 and R7 are tensile strain meter, and sensitive grid R2, R4, R6 and R8 are the compressive strain meter; Wherein, R1 connects with R3, and R2 connects with R6; R4 connects with R8, and R5 connects with R7, and four groups of series circuits are formed 4 brachium pontis of Wheatstone bridge.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (1)
1. strain ga(u)ge comprises two groups of sensitive grids and four pads, and four pads on the said strain ga(u)ge sensitive grid are arranged on a side of sensitive grid, and its two groups of sensitive grids and four pads are arranged in the same substrate of said strainometer; Said two groups of resistance sensitive grids axially become 45 degree and 135 degree respectively with X direction, and two groups of resistance sensitive grids axially each other vertical forms the 90 two axial strain meters of spending; The medial axis left-right symmetric of said two groups of resistance sensitive grids, and every group of resistance sensitive grid is through dot center's symmetry among self axially parallel cornerwise; Said strainometer can be semibridge system combination or full-bridge type combination; It is characterized in that,
Said strainometer is applicable to measure shear stress or be used for simple shear cuts beam type and double-shear beam sensor;
The single armed resistance of said strainometer is between 100-2000 ohm;
Said sensor comprises: strain ga(u)ge, elastic body, seaming chuck, steel ball and steel ball sheath, said strain ga(u)ge are arranged on the said elastomeric both sides of symmetry all around; Said elastic body is seated on the load base; Said seaming chuck is arranged on the top of steel ball; Said steel ball is seated in the steel ball sheath and is arranged on elastomeric top; Two surveys of said elastic body top also are respectively arranged with secure component is fixed as one elastic body and load base; Said sensor is that simple shear is cut beam type and double-shear beam type dynamometry and LOAD CELLS, and is provided with two pieces of strainometers on each dynamometry and the LOAD CELLS at least;
Shearing beam type dynamometry and LOAD CELLS adopts 4 pieces of strainometers to be installed on the web between the blind hole of elastic body both sides; Be used to measure and be applied to the strain that the load on the seaming chuck causes; Strainometer on the sensor is installed on the midsection of beam length, and the transverse axis center line that makes strainometer simultaneously is on the neutral line of beam, and the wire grid of strainometer becomes 45 degree with central core; If the pad that is arranged on the strainometer on the web front down, then the pad of strainometer is up on the web reverse side;
The said strainometer arrangement mode that is arranged on dynamometry and the LOAD CELLS is along left-right symmetric on the vertical pivot center of effort line; Be symmetry up and down along the transverse axis center line; When it is arranged on strainometer quantity on dynamometry and the LOAD CELLS greater than two, then include two pieces of strainometer and two pieces of strainometers that the wire grid that is stressed shortens that receive the elongation of pulling force wire grid at least; The said strainometer of pulling force wire grid elongation and the strainometer that the wire grid that is stressed shortens of receiving constitutes the Performance Detection that Wheatstone bridge is used for signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100801899A CN101532817B (en) | 2009-03-26 | 2009-03-26 | Resistance strain gauge and sensor using resistance strain gauge to change stress transfer mode |
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| CN2009100801899A CN101532817B (en) | 2009-03-26 | 2009-03-26 | Resistance strain gauge and sensor using resistance strain gauge to change stress transfer mode |
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| CN101532817B true CN101532817B (en) | 2012-04-11 |
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Cited By (1)
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| CN109489901A (en) * | 2018-11-22 | 2019-03-19 | 北京航天计量测试技术研究所 | A kind of online quality center of mass measuring table in assembly docking scene |
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| CN103411712B (en) * | 2013-07-18 | 2015-12-16 | 电子科技大学 | Contact stress sensor |
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| CN103728067B (en) * | 2014-01-23 | 2015-07-22 | 济南金钟电子衡器股份有限公司 | Resistance strain gauge for stress analysis |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4086554A (en) * | 1975-11-12 | 1978-04-25 | Daimler-Benz Aktiengesellschaft | Strain gauge |
| CN2436383Y (en) * | 2000-07-17 | 2001-06-27 | 哈尔滨市龙威经济技术开发有限责任公司 | Double-shearing beam type two-dimension force sensor |
| DE10040287A1 (en) * | 2000-08-17 | 2002-02-28 | Hbm Mes Und Systemtechnik Gmbh | Double resistance strain gage arrangement for shear force stress detection, has meander shaped resistance strain gages, each comprising two measurement guides arranged diagonally in opposition on support, at specified angle |
| CN201107141Y (en) * | 2007-08-23 | 2008-08-27 | 罗绪荆 | Crisscross bridge type sensor |
-
2009
- 2009-03-26 CN CN2009100801899A patent/CN101532817B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4086554A (en) * | 1975-11-12 | 1978-04-25 | Daimler-Benz Aktiengesellschaft | Strain gauge |
| CN2436383Y (en) * | 2000-07-17 | 2001-06-27 | 哈尔滨市龙威经济技术开发有限责任公司 | Double-shearing beam type two-dimension force sensor |
| DE10040287A1 (en) * | 2000-08-17 | 2002-02-28 | Hbm Mes Und Systemtechnik Gmbh | Double resistance strain gage arrangement for shear force stress detection, has meander shaped resistance strain gages, each comprising two measurement guides arranged diagonally in opposition on support, at specified angle |
| CN201107141Y (en) * | 2007-08-23 | 2008-08-27 | 罗绪荆 | Crisscross bridge type sensor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109489901A (en) * | 2018-11-22 | 2019-03-19 | 北京航天计量测试技术研究所 | A kind of online quality center of mass measuring table in assembly docking scene |
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