CN105424238B - Stress strain sensor - Google Patents
Stress strain sensor Download PDFInfo
- Publication number
- CN105424238B CN105424238B CN201510901779.9A CN201510901779A CN105424238B CN 105424238 B CN105424238 B CN 105424238B CN 201510901779 A CN201510901779 A CN 201510901779A CN 105424238 B CN105424238 B CN 105424238B
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- China
- Prior art keywords
- covering
- sensing element
- sensor
- strain gauge
- stress strain
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000002131 composite material Substances 0.000 claims abstract description 27
- 238000009434 installation Methods 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 13
- 239000011241 protective layer Substances 0.000 claims description 10
- 239000011152 fibreglass Substances 0.000 claims description 9
- 239000007767 bonding agent Substances 0.000 claims description 3
- 238000005253 cladding Methods 0.000 abstract 2
- 238000000034 method Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 10
- 238000005259 measurement Methods 0.000 description 9
- 230000006378 damage Effects 0.000 description 6
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- 238000009413 insulation Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 229910001006 Constantan Inorganic materials 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
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- 230000005611 electricity Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2268—Arrangements for correcting or for compensating unwanted effects
- G01L1/2281—Arrangements for correcting or for compensating unwanted effects for temperature variations
Abstract
The embodiment of the invention provides a stress strain sensor which comprises a sensitive element and a cladding coated outside the sensitive element, wherein at least one part of the cladding is made of a composite material. The sensor improves the durability and maintainability of a sensitive element of the sensor, and can improve the compatibility of the sensor and the contact surface of a measured piece of the composite material when the measured piece of the composite material is measured, so that the strain of the measured piece of the composite material can be better transmitted.
Description
Technical field
The present invention relates to field of measuring technique more particularly to a kind of stress strain gauges.
Background technology
The popularity and particularity used with wind generator set blade and cabin is directed to the cabin of composite material at present
Measurement with blade stress strain is commonly used strain gauge (medium temperature foil resistance strain gauge) and is realized, but strain gauge frequently includes following three
Point shortcoming：
The first, implementation is more demanding, and installation procedure and complex process, efficiency is low, is not suitable for batch and uses (installation strain gauge
It is required that the staff of professional skill, therefore such as to use in batches on a large scale, need the installation personnel for cultivating a large amount of professions real
It applies).In addition, the technical ability ginseng time because of technical staff is uneven, the bigger difference of test result is caused.
The second, maintainable poor, maintenance cost is high.It goes wrong in unit running process, needs professional to locate
Reason, increases time cost and personnel's maintenance cost.
Third, application range limitation.Strain gauge on the market at present, is influenced by its own design feature, is not suitable for
It is pre-buried when machining composite material component.
Invention content
The purpose of the present invention is to provide a kind of stress strain gauges, and the strain gauge to solve the prior art is implemented to require
The problem of high, maintainable difference and application range are limited to.
The embodiment of the present invention provides a kind of stress strain gauge, including sensing element and is coated on outside sensing element
At least part of covering, covering is made of composite material.
Preferably, covering includes protection covering and work covering, and covering or work covering is protected to be equipped with groove, sensitive member
Part is fixed in groove.
Preferably, the one side of separate protection covering of covering of working is the working face coordinated with measured piece, is protected on covering
It is arranged fluted, sensing element is set in groove, and at least one side of sensing element is bonded with work covering.
Preferably, temperature-compensating plate is additionally provided in groove, temperature-compensating plate is arranged side by side with sensing element, and temperature-compensating
At least one side of piece is bonded with work covering.
Preferably, protect covering on be arranged it is fluted, between groove and sensing element be equipped with electromagnetic shielding protective layer, electromagnetism
Shielding protection layer covers the surface far from the working face of sensing element.
Preferably, sensor further includes test lead, and test lead is extend out to outside covering.
Preferably, covering is Composite materials Clad, and composite material is fiberglass.
Preferably, shell corresponding with measured piece on covering is protected to be equipped with installation reference line.
Preferably, multiple mounting holes are provided on covering.
Preferably, it protects and passes through adhesive bond between covering and work covering.
Preferably, stress strain gauge is installed in the cabin and/or blade of wind power generating set, for measuring cabin
And/or the ess-strain value of blade.
The stress strain gauge provided according to embodiments of the present invention, because using at least part for the covering of composite material
Sensing element is packaged, on the one hand, the durability and maintainability of the sensing element of sensor are improved, on the other hand,
When the measured piece to composite material measures, the compatibility of the contact surface of sensor and measured piece can be improved, preferably
Transmit the strain of composite material measured piece.
Description of the drawings
Fig. 1 is the sensor mounting surface schematic diagram of the embodiment of the present invention；
Fig. 2 is the sensor protection covering schematic diagram of the embodiment of the present invention；
Fig. 3 is the sensor internal structure cut-away illustration of the embodiment of the present invention；
Fig. 4 is the sensor side section schematic diagram of the embodiment of the present invention.
Reference sign：
1, working face；2, lead；3, installation reference line；4, covering is protected；5, sensing element；6, it is electromagnetically shielded protective layer；
7, bonding agent；10, work covering.
Specific implementation mode
Detailed description of the present invention exemplary embodiment below in conjunction with the accompanying drawings.
The present invention relates to strain gauge transducer, strain gauge transducer is usually by resistance strain gage and measures conversion circuit two
Part forms.The operation principle of resistance strain gage is：Resistance strain gage using when with being adhesive on measured piece, when measured piece stress
When deformation, the length of wire changes with cross-sectional area also with measured piece one in foil gauge, and then the variation of resistance occurs,
Since the variation of strain and the opposite of resistance change linear correspondence, measures bridge using Wheatstone bridge and export electricity
The changing value of pressure can extrapolate corresponding strain increment.
As shown in Figures 3 and 4, the embodiment of the present invention provides a kind of stress strain gauge, including sensing element 5 and packet
Overlay on the covering outside sensing element 5, wherein sensing element 5 is the part of energy direct feeling measured variable in sensor, it can
Delicately experience measured variable, and converts ess-strain to electric signal output.The effect of covering outside sensing element 5 is to prevent
The sensing element 5 of sensor internal while being reduced the process of sensing element 5 when in use by the destruction and deformation of mechanical force,
Improve service efficiency.At least part of the covering is made of composite material.
The stress strain gauge of the present embodiment because use at least part for the covering of composite material to sensing element 5 into
Row encapsulation, on the one hand, the durability and maintainability for improving the sensing element 5 of sensor overcome traditional foil gauge and measure
Maintainability it is poor, maintenance cost height and unfit for defect, improve the degree of protection of sensor.Another party
Face is tested because being at least partially composite material in the encapsulating material of the sensor of the embodiment of the present invention to composite material
When part measures, compatibility (working face 1 of sensor and the measured piece table of the contact surface of sensor and measured piece can be improved
Face is identical material), preferably transmit the strain of composite material measured piece, it is ensured that sensor can be to the dependent variable of composite material
It measures.
As shown in figure 4, specifically, the covering of sensor includes protection covering 4 and work covering 10, protects covering 4 and work
Make to be bonded with bonding agent 7 between covering 10, and ensures its sealing performance.Protection covering 4 is mainly used for work covering 10 together
Effective protection is formed outside sensing element 5, makes the sensing element 5 of sensor internal from the destruction and deformation of mechanical force, simultaneously
Protection covering 4 and work covering 10 also there is anti-corrosion, moisture-proof function to make sensor in this way, the degree of protection of sensor can be improved
Degree of protection reach IP54.For ease of placing sensing element 5, it is equipped with groove on protection covering 4 and/or work covering 10,
Sensing element 5 is fixed in groove, and fixation and positioning of the sensing element 5 in sensor internal so may be implemented, it is ensured that
Sensing element 5 will not be moved arbitrarily in sensor, and facilitated the sensing element 5 of sensor to be directed at measured piece and measured.
Preferably, protection covering 4 on be arranged it is fluted, sensing element 5 be set to protection covering 4 groove in.In this way
Setting can not only be securely fixed sensing element 5, but also be not necessarily to destruction work covering 10.The work covering 10 of sensor directly with it is quick
The side of sensing unit 5 is bonded, and the one side of the separate protection covering 4 of the work covering 10 of sensor is the work coordinated with measured piece
Face 1, i.e., when using sensor, the working face 1 of the work covering 10 of sensor contacts with measured piece surface and carries out strain survey
Amount.
To improve the measurement accuracy of sensor, influence of the environment temperature to measured value is effectively reduced, temperature is additionally provided in groove
Compensating plate is spent, temperature-compensating plate is arranged side by side with sensing element 5, and at least one side of temperature-compensating plate and work covering 10
Fitting.Temperature-compensating plate need to choose temperature-resistant material and be made, such as Karma metal either constantan.When in use,
Since temperature-compensating plate has been preset between sensing element 5 and protection covering 4, thus during can be omitted existing use
Carry out temperature-compensating processing the step of, reduce using difficulty and setting the time.
Specifically, sensing element 5 is identical as the material of temperature-compensating plate, and sensing element 5 is by Karma metal or constantan system
At.
To further increase the measurement accuracy of sensor, the anti-electromagnetic interference capability of sensor is improved, is protected on covering 4
Electromagnetic shielding protective layer 6 is equipped between groove and sensing element 5, electromagnetic shielding protective layer 6 covers the separate described of sensing element 5
The surface of working face.When having temperature-compensating plate and electromagnetic shielding protective layer 6 in stress strain gauge simultaneously, temperature-compensating
Piece is disposed side by side on sensing element 5 in the groove of protection covering, and at least one side of temperature-compensating plate and sensing element 5
At least one side with work covering 10 be bonded.At this point, electromagnetic shielding protective layer 6 need to cover sensing element 5 and temperature simultaneously
Spend the surface of the separate working face of compensating plate.Protective layer 6 is electromagnetically shielded for realizing the function of shielding of electromagnetic interference, while can be prevented
It is rotten and moisture-proof.Electromagnetic shielding protective layer 6 is made of metal material, concretely tinfoil paper.
As shown in Figure 1, easily to fix sensor, the efficiency measured to measured piece, the test of sensor are improved
Lead 2 is extend out to outside its covering.And according to the actual conditions of measured piece, test lead 2 is accessed sometimes for more convenient
Test equipment can also be appropriately extended the length (lead 2 has been carried out reserved before encapsulating) of test lead 2, be allowed to more easily access survey
Try equipment.
Specifically, the mark of lead 2 can be set on covering, to facilitate staff's wiring, can also be set on lead 2
Set mark, 2 type of identification leader and effect, the signal lead 2 of sensor identifies as follows, can be identified according to following lead 2, directly
Access test equipment, you can realize and measure.
EX+ --- excitation "+"；
IN+ --- signal inputs "+"；
EX- --- excitation "-"；
IN- --- signal inputs "-"；
GND --- ground terminal；
(traditional strain gauge need to be bonded connecting terminal and welding lead 2), this hair compared with traditional strain gauge mode of connection
The lead 2 of the sensor of bright embodiment is more convenient to use, is more applicable for the application of Practical Project.
To solve the problems, such as the stress-strain measurement of wind power generating set composite material component (such as cabin and blade), sense
The work covering 10 of device is glass fiber reinforced plastics composite material, to realize that the integrally-built consistency of sensor (is processed and criticized convenient for making
Amount production), the protection covering 4 of sensor is also glass fiber reinforced plastics composite material.In this way, fiberglass sensor is because of its work covering 10
Glass fiber reinforced plastics composite material, therefore, it is organic toughened glass, fiber glass epoxy, phenolic fiberglass reinforced plastics etc. which, which is suitable for material,
(working face 1 of sensor is identical as the material of measured piece, and the two has preferable compatibility, improves and measures for the measurement of measured piece
Accuracy), it can be applied not only to the stress-strain measurement of wind generating set engine room and/or blade (in use, stress is answered
Become sensor to be installed in the cabin and/or blade of wind power generating set, the stress for measuring the cabin and/or blade is answered
Variate), it may also be used for other field, as long as the material of measured piece is glass fiber reinforced plastics composite material.It certainly, similarly, can be with
The work covering 10 of sensor is substituted for other materials as needed, as long as survey can be realized in the material identical with measured piece
Amount.
To reach insulation technology requirement, the clad material of sensor should be insulating materials, therefore comparable in terms of insulation
Traditional strain gauge promotes a grade.
As shown in Fig. 2, to further facilitate the use of sensor, it is corresponding with measured piece on the protection covering 4 of sensor
Shell is equipped with installation reference line 3.Installation reference line 3 is mainly used for the installation direction for assisting determining sensor.Specifically, make
Used time first determines the Impact direction of measured piece, and on measured piece surface, scribing line is marked, and base need to will be only installed when fixing sensor
Directrix 3 is corresponding with measured piece surface markers line, you can determines the installation direction of sensor, then implements to measure.
Specifically, the connection type of sensor and measured piece can direct gluing, can also be set on the covering of sensor
It is equipped with multiple mounting holes.Preferably, sensor quadrangle trepanning, it is with fixing pieces such as bolt or rivets that sensor is tight with measured piece
It is close to connect, measured piece is implemented to measure.
The sensor of the embodiment of the present invention enormously simplifies technique on mounting means, and it is difficult to reduce using for operating personnel
Degree.The mounting means of traditional strain gauge is higher to surface roughness requirements, needs to polish to measured piece surface fine and clean.Separately
Outside, it is also higher to mounting process requirement to paste strain gauge, for example, method of attaching, installation direction is moisture-proof, anti-corrosion, insulation processing,
Anti-interference shielding processing etc., cumbersome, and the operation in installation process directly affects measurement result.Such as above-mentioned reason passes
The staff of the strain gauge installation requirement professional skill of system uses strain gauge if necessary to extensive batch, needs training big
Qualified installation person is measured to implement, because the technical ability of technical staff has difference, causes the bigger difference of test result.And the present invention is real
The sensor for applying example saves these operating procedures, in use, installation personnel only need to be by working face 1 acetone or 95% of sensor
Ethyl alcohol is cleaned, and glue special is uniformly smeared on its surface, is then done simple cleaning or grinding process on measured piece surface, is protected
It is solid and reliable to demonstrate,prove gluing between sensor and measured piece.Mounting process is simple, is easy to use in engineering.For example, can be with
Sensor is embedded in measured piece to measures as needed (traditional strain gauge structure feature is not suitable in processing measured piece
When it is pre-buried).
The measurement process of the sensor of the embodiment of the present invention is also relatively easy, in test process, because of measured piece and sensor
1 strong bond of working face, the deformation of measured piece is effectively passed on the working face 1 of sensor, passes through sensing element 5 and perceives work
Make the deformation on face 1, to perceive measured piece deformation, then converts this deformation to electric signal output to collecting device to count
Calculate the ess-strain value suffered by measured piece.Ensure the strong bond of working face 1 and measured piece surface in use, you can ensure tested
Effective transmission of part deformation.
Certainly, can also according to the structure of measurand form (such as pulling force, pressure, shearing force and torsion) and measured piece,
Other suitable sensors, the embodiment of the present invention is selected not to limit herein.
Sensor provided in an embodiment of the present invention also has reusability.Traditional strain gauge is disposable side
Formula can not reuse, and be unfavorable for saving resource and cost.Design structure of the sensor of embodiment because of its optimization so that pass
Sensor after test completion, the glue on application work face 1 and measured piece surface is cleared up with special solvent, you can removal sensor,
Then 1 residual solvent of cleaning sensor working face and glue so neither damage sensor, and reusable, pole again
The earth reduces cost consumption.
In addition to this, sensor provided in an embodiment of the present invention also has maintainable well.In use, such as sensor
Or circuit damage, the sensor of damage and circuit need to only be cleaned up, spare sensor is reinstalled at former measuring point.
Stress strain gauge provided in an embodiment of the present invention has the following technical effect that：
The component of composite material can more conveniently be measured, and reduce implementation require, simplify installation procedure and
Mounting process, thus expand application range and apply scale；Improve maintainability, reduce can maintenance cost, and can
To reuse；It is small, light-weight, and integration packaging, degree of protection is higher (up to IP54), is easy to transport and store；Tool
There are electromagnetism interference, temperature supplement and insulating protection technical finesse, improves measurement accuracy.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (7)
1. a kind of stress strain gauge, which is characterized in that including sensing element (5) and be coated on the sensing element (5) outside
Covering, at least part of the covering is made of composite material；The covering includes protection covering (4) and work covering
(10), the one side far from the protection covering (4) of the work covering (10) is the working face (1) coordinated with measured piece, institute
It states and is arranged fluted in protection covering (4), the sensing element (5) is set in the groove, and the sensing element (5)
At least one side is bonded with the work covering (10)；Temperature-compensating plate, the temperature-compensating plate are additionally provided in the groove
It is arranged side by side with the sensing element (5), and at least one side of the temperature-compensating plate is pasted with the work covering (10)
It closes；Electromagnetic shielding protective layer (6) is equipped between the groove and the sensing element (5), the electromagnetic shielding protective layer (6) is covered
Cover the surface far from the working face of the sensing element (5).
2. stress strain gauge according to claim 1, which is characterized in that further include test lead (2), the test
Lead (2) is extend out to outside the covering.
3. stress strain gauge according to claim 1, which is characterized in that the covering is Composite materials Clad,
The composite material is fiberglass.
4. stress strain gauge according to claim 1, which is characterized in that on the protection covering (4) and measured piece
Corresponding shell is equipped with installation reference line (3).
5. stress strain gauge according to claim 1, which is characterized in that be provided with multiple installations on the covering
Hole.
6. stress strain gauge according to claim 1, which is characterized in that the protection covering (4) and the work
It is bonded by bonding agent (7) between covering (10).
7. stress strain gauge as claimed in any of claims 1 to 6, which is characterized in that the ess-strain
Sensor is installed in the cabin and/or blade of wind power generating set, the ess-strain for measuring the cabin and/or blade
Value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510901779.9A CN105424238B (en) | 2015-12-08 | 2015-12-08 | Stress strain sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510901779.9A CN105424238B (en) | 2015-12-08 | 2015-12-08 | Stress strain sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105424238A CN105424238A (en) | 2016-03-23 |
| CN105424238B true CN105424238B (en) | 2018-07-27 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510901779.9A Active CN105424238B (en) | 2015-12-08 | 2015-12-08 | Stress strain sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN105424238B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106248045A (en) * | 2016-09-06 | 2016-12-21 | 西安交通大学 | A kind of strain measurement system of anti-strong electromagnetic |
| DE102016217585B3 (en) | 2016-09-15 | 2017-08-03 | Schaeffler Technologies AG & Co. KG | Strain gauge and method for making a strain gauge |
| CN106839964A (en) * | 2016-12-30 | 2017-06-13 | 北京盘天新技术有限公司 | A kind of strain-ga(u)ge transducer and its installation method |
| KR101944413B1 (en) * | 2017-02-06 | 2019-04-17 | 울산과학기술원 | Strain sensor using Carbon nano-particle tape and manufacturing method of the same |
| US11221263B2 (en) * | 2017-07-19 | 2022-01-11 | Nextinput, Inc. | Microelectromechanical force sensor having a strain transfer layer arranged on the sensor die |
| CN109000837B (en) * | 2018-05-09 | 2021-03-23 | 中南大学 | Method for monitoring interface stress between hot-press curing composite material part and mould |
| CN110005906A (en) * | 2019-04-19 | 2019-07-12 | 北京豪特耐管道设备有限公司 | A kind of insulated piping and its manufacturing method |
| CN111941945A (en) * | 2019-04-29 | 2020-11-17 | 臻鼎科技股份有限公司 | Elastic conductive composite fabric |
| JP2022106507A (en) * | 2021-01-07 | 2022-07-20 | ミネベアミツミ株式会社 | Strain gauge |
| CN114485754A (en) * | 2022-01-05 | 2022-05-13 | 安徽驭风能源科技有限公司 | Sensor convenient to install on combined material surface |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54121784A (en) * | 1978-03-15 | 1979-09-21 | Hitachi Ltd | Surface sensor between contact faces |
| WO2010055282A1 (en) * | 2008-11-12 | 2010-05-20 | Qinetiq Limited | Composite sensor |
| CN202974180U (en) * | 2012-12-18 | 2013-06-05 | 无锡莱顿电子有限公司 | Piezoresistive strain gauge of ceramic base |
| CN203534737U (en) * | 2013-07-05 | 2014-04-09 | 河南理工大学 | Temperature sensor-based testing device for hollow inclusion stress gauges |
| CN203385498U (en) * | 2013-07-18 | 2014-01-08 | 电子科技大学 | Contact stress sensor |
| CN205209670U (en) * | 2015-12-08 | 2016-05-04 | 北京金风科创风电设备有限公司 | Stress and strain sensor |
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2015
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