CN205209670U - Stress and strain sensor - Google Patents
Stress and strain sensor Download PDFInfo
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- CN205209670U CN205209670U CN201521013053.3U CN201521013053U CN205209670U CN 205209670 U CN205209670 U CN 205209670U CN 201521013053 U CN201521013053 U CN 201521013053U CN 205209670 U CN205209670 U CN 205209670U
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- strain gauge
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- stress strain
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- 239000011152 fibreglass Substances 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 8
- 239000007767 bonding agent Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 13
- 238000005253 cladding Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 15
- 238000005259 measurement Methods 0.000 description 9
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Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
An embodiment of the utility model provides a stress and strain sensor, this sensor include sensing element and the cladding covering outside sensing element, and the partly at least of covering makes for combined material. This sensor has improved the sensing element's of sensor durability and maintainability on the one hand, and on the other hand when the measured piece to combined material is measured, can improve the compatibility of the contact surface of sensor and measured piece, transmits meeting an emergency of combined material measured piece betterly.
Description
Technical field
The utility model relates to field of measuring technique, particularly relates to a kind of stress strain gauge.
Background technology
The popularity used along with wind generator set blade and cabin and singularity, commonly use strainometer (middle temperature foil resistance strain gauge) for the cabin of compound substance and the measurement of blade stress strain at present to realize, but strainometer often comprises following 3 weak points:
The first, urban d evelopment is higher, installation procedure and complex process, efficiency is low, is not suitable for batch and uses (the staff of installation strainometer requirement professional skill, therefore as wanted extensive batch to use, the installation personnel cultivating a large amount of specialty is needed to implement).In addition, because the technical ability ginseng of technician is secondary uneven, the bigger difference of test result is caused.
The second, maintainable poor, maintenance cost is high.Go wrong in unit running process, need professional to process, add time cost and personnel's maintenance cost.
Three, range of application limitation.Current strainometer on the market, by the impact of himself design feature, is not suitable for when machining composite material component pre-buried.
Utility model content
The purpose of this utility model is to provide a kind of stress strain gauge, the problem of high with the strainometer urban d evelopment solving prior art, maintainable difference and range of application limitation.
Embodiment of the present utility model provides a kind of stress strain gauge, comprises sensitive element and is coated on covering outside sensitive element, covering at least partially for compound substance is made.
Preferably, covering comprises protection covering and work covering, and protection covering or work covering are provided with groove, and sensitive element is fixedly installed in groove.
Preferably, the one side away from protection covering of work covering is the workplace coordinated with measured piece, and protection covering is provided with groove, and sensitive element is arranged in groove, and at least one side of sensitive element and saddlebag laminating close.
Preferably, be also provided with temperature compensation sheet in groove, temperature compensation sheet and sensitive element are arranged side by side, and at least one side of temperature compensation sheet and saddlebag laminating close.
Preferably, protection covering is provided with groove, is provided with electromagnetic screen protective layer between groove and sensitive element, electromagnetic screen protective layer covers the surface away from described workplace of sensitive element.
Preferably, sensor also comprises test lead, and test lead extend out to covering outside.
Preferably, covering is Composite materials Clad, and compound substance is fiberglass.
Preferably, the shell corresponding with measured piece on covering is protected to be provided with installation reference line.
Preferably, covering is provided with multiple mounting hole.
Preferably, protect between covering and work covering and pass through adhesive bond.
Preferably, on the cabin that stress strain gauge is installed on wind power generating set and/or blade, for measuring the ess-strain value of cabin and/or blade.
According to the stress strain gauge that the utility model embodiment provides, because adopting at least partially for the covering of compound substance encapsulates sensitive element, on the one hand, improve durability and the maintainability of the sensitive element of sensor, on the other hand, when measuring the measured piece of compound substance, the compatibility of the surface of contact of sensor and measured piece can be improved, transmitting the strain of compound substance measured piece preferably.
Accompanying drawing explanation
Fig. 1 is the sensor installed surface schematic diagram of embodiment of the present utility model;
Fig. 2 is the sensor protection covering schematic diagram of embodiment of the present utility model;
Fig. 3 is the sensor internal structure cut-away illustration of embodiment of the present utility model;
Fig. 4 is the sensor side tangent plane schematic diagram of embodiment of the present utility model.
Description of reference numerals:
1, workplace; 2, go between; 3, installation reference line; 4, covering is protected; 5, sensitive element; 6, electromagnetic screen protective layer; 7, bonding agent; 10, work covering.
Embodiment
Exemplary embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
The utility model relates to strain gauge transducer, and strain gauge transducer is generally made up of resistance strain gage and measurement change-over circuit two parts.The principle of work of resistance strain gage is: stick with glue on measured piece when resistance strain gage uses, when measured piece stress deformation, in foil gauge, length wiry and cross-sectional area are also along with measured piece one changes, and then there is the change of resistance, due to the change of strain and the relative change linearly corresponding relation of resistance, the changing value therefore utilizing Wheatstone bridge to measure bridge road output voltage can extrapolate corresponding strain increment.
As shown in Figures 3 and 4, embodiment of the present utility model provides a kind of stress strain gauge, the covering comprising sensitive element 5 and be coated on outside sensitive element 5, wherein, sensitive element 5 is parts of energy direct feeling measured variable in sensor, it can experience measured variable delicately, and ess-strain is converted into electric signal output.The effect of the covering outside sensitive element 5 is the destruction and the distortion that prevent the sensitive element 5 of sensor internal to be subject to mechanical force, reduces sensitive element 5 operation in use simultaneously, improves service efficiency.This covering at least partially for compound substance is made.
The stress strain gauge of the present embodiment is because adopting at least partially for the covering of compound substance encapsulates sensitive element 5, on the one hand, improve durability and the maintainability of the sensitive element 5 of sensor, the maintainability overcoming the measurement of traditional foil gauge is poor, maintenance cost is high and be not suitable for reusable defect, improves the degree of protection of sensor.On the other hand, because being compound substance at least partially in the encapsulating material of the sensor of the utility model embodiment, when measuring the measured piece of compound substance, the compatibility (workplace 1 and the measured piece surface of sensor are identical material) of the surface of contact of sensor and measured piece can be improved, transmit the strain of compound substance measured piece preferably, guarantee that sensor can be measured the dependent variable of compound substance.
As shown in Figure 4, particularly, the covering of sensor comprises protection covering 4 and work covering 10, bonds, and guarantee its sealing property between protection covering 4 and work covering 10 with bonding agent 7.Protection covering 4 is mainly used in effectively protecting outer formation of sensitive element 5 together with the covering 10 that works; the sensitive element 5 of sensor internal is made to avoid destruction and the distortion of mechanical force; protect covering 4 and work covering 10 also to have anticorrosion, moisture-proof function simultaneously; so; the degree of protection of sensor can be improved, make the degree of protection of sensor reach IP54.For ease of placing sensitive element 5; protection covering 4 and/or work covering 10 are provided with groove; sensitive element 5 is fixedly installed in groove; so can realize sensitive element 5 in the fixing of sensor internal and location; guarantee that sensitive element 5 can not arbitrarily movement in sensor, and facilitate the sensitive element 5 of sensor to aim at measured piece to measure.
Preferably, protection covering 4 is provided with groove, and sensitive element 5 is arranged in the groove of protection covering 4.Such setting both can reliably fix sensitive element 5, again without the need to destruction work covering 10.Fit in the work covering 10 of sensor side that is direct and sensitive element 5; the one side away from protection covering 4 of the work covering 10 of sensor is the workplace 1 coordinated with measured piece; namely, when using sensor, the workplace 1 of the work covering 10 of sensor is with measured piece surface contact and carry out strain measurement.
For improving the measuring accuracy of sensor, effectively reduce environment temperature to the impact of measured value, be also provided with temperature compensation sheet in groove, temperature compensation sheet and sensitive element 5 are arranged side by side, and fit with work covering 10 at least one side of temperature compensation sheet.Temperature compensation sheet need be chosen temperature-resistant material and make, such as Karma metal or constantan.In use, because temperature compensation sheet has been preset between sensitive element 5 and protection covering 4, thus can omit the step of carrying out temperature compensation process in existing use procedure, reduce and use difficulty and setup times.
Particularly, sensitive element 5 is identical with the material of temperature compensation sheet, and sensitive element 5 is made up of Karma metal or constantan.
For improving the measuring accuracy of sensor further; improve the anti-electromagnetic interference capability of sensor; be provided with electromagnetic screen protective layer 6 between groove on protection covering 4 and sensitive element 5, electromagnetic screen protective layer 6 covers the surface away from described workplace of sensitive element 5.When having temperature compensation sheet and electromagnetic screen protective layer 6 in stress strain gauge simultaneously; temperature compensation sheet and sensitive element 5 be disposed side by side on protect covering groove in, and at least one side of at least one side of temperature compensation sheet and sensitive element 5 all with work covering 10 fit.Now, electromagnetic screen protective layer 6 need cover the surface away from workplace of sensitive element 5 and temperature compensation sheet simultaneously.Electromagnetic screen protective layer 6, simultaneously can be anticorrosion and moistureproof for realizing the function of shielding of electromagnetic interference (EMI).Electromagnetic screen protective layer 6 is made for metal material, specifically can be tinfoil paper.
As shown in Figure 1, for convenience of ground fixation of sensor, improve the efficiency measured measured piece, the test lead 2 of sensor extend out to its covering outside.And according to the actual conditions of measured piece, sometimes in order to more convenient, test lead 2 is accessed testing apparatus, also can proper extension test lead 2 length (lead-in wire 2 encapsulation before carried out reserved), make it more easily to access testing apparatus.
Particularly, lead-in wire 2 can be set on covering and identify, to facilitate staff's wiring, also can arrange mark on lead-in wire 2, identification leader 2 kind and effect, the signal lead 2 of sensor identifies as follows, can identify according to following lead-in wire 2, directly access testing apparatus, can realize measuring.
EX+---excitation "+";
IN+---signal input "+";
EX----excitation "-";
IN----signal input "-";
GND---earth terminal;
Compared with traditional strainometer mode of connection (traditional strainometer needs bonding connection terminal and welding lead 2), the lead-in wire 2 of the sensor of the utility model embodiment uses convenient, is more applicable for the application of Practical Project.
For solving the stress-strain measurement problem of wind power generating set composite material component (such as cabin and blade); the work covering 10 of sensor is glass fiber reinforced plastics composite material; for realizing the integrally-built consistance of sensor (being convenient to make processing and batch production), the protection covering 4 of sensor is also glass fiber reinforced plastics composite material.So, fiberglass sensor because of its work covering 10 be glass fiber reinforced plastics composite material, therefore, it is organic toughened glass that this sensor is applicable to material, fiber glass epoxy, (workplace 1 of sensor is identical with the material of measured piece in the measurement of the measured piece of phenolic fiberglass reinforced plastics etc., the two has good compatibility, improve accuracy of measurement), not only can be applicable to the stress-strain measurement of wind generating set engine room and/or blade (during use, on cabin stress strain gauge being installed on wind power generating set and/or blade, for measuring the ess-strain value of described cabin and/or blade), also can be used for other field, as long as the material of measured piece is glass fiber reinforced plastics composite material.Certainly, in like manner, as required the work covering 10 of sensor can also be replaced to other material, can realize measuring as long as identical with the material of measured piece.
For reaching insulation technology requirement, the clad material of sensor should be insulating material, and therefore in insulation, comparable traditional strainometer promotes a grade.
As shown in Figure 2, for further facilitating the use of sensor, on the protection covering 4 of sensor, the shell corresponding with measured piece is provided with installation reference line 3.Installation reference line 3 is mainly used in the auxiliary installation direction determining sensor.Specifically, during use, first determine the Impact direction of measured piece, and mark in the line of measured piece surface, only need be corresponding with measured piece surface indicia line by installation reference line 3 during fixation of sensor, the installation direction of sensor can be determined, then implement to measure.
Particularly, the connected mode of sensor and measured piece can be directly gluing, also can be provided with multiple mounting hole on the covering of sensor.Preferably, the perforate of sensor corner, gets up sensor and measured piece compact siro spinning technology with the fixture such as bolt or rivet, implements to measure to measured piece.
The sensor of the utility model embodiment enormously simplify technique on mounting means, reduces the use difficulty of operating personnel.The mounting means effects on surface roughness requirements of tradition strainometer is higher, needs the polishing of measured piece surface fine and cleaning.In addition, paste strainometer and require also higher to mounting process, such as, method of attaching, installation direction, moistureproof, anticorrosion, insulation processing, anti-interference shielding processing etc., cumbersome, and the operation in installation process directly affects measurement result.Such as above-mentioned reason, the staff of traditional strainometer installation requirement professional skill, if need extensive batch to use strainometer, needs to train a large amount of qualified installation person to implement, because the technical ability of technician has difference, causes the bigger difference of test result.And the sensor of the utility model embodiment saves these operation stepss, during use, the workplace 1 of sensor acetone or 95% ethanol only need clean by installation personnel, glue special is smeared at its surface uniform, then do simple cleaning or grinding process on measured piece surface, ensure between sensor and measured piece gluing solid and reliable.Mounting process is simple, is easy to use in engineering.Such as, sensor can be embedded in measured piece as required and carry out measuring (traditional strain gauge structure feature is not suitable for when processing measured piece pre-buried).
The measuring process of the sensor of the utility model embodiment is also relatively simple, in test process, because of workplace 1 strong bond of measured piece and sensor, the distortion of measured piece is effectively delivered on the workplace 1 of sensor, by the distortion on sensitive element 5 perception workplace 1, thus the distortion of perception measured piece, then this distortion is converted into electric signal and outputs to collecting device to calculate the ess-strain value suffered by measured piece.Use the strong bond on middle guarantee workplace 1 and measured piece surface, effective transmission that measured piece is out of shape can be ensured.
Certainly, also can according to the structure of measurand form (as pulling force, pressure, shearing force and torsion) and measured piece, select the sensor that other are suitable, the utility model embodiment does not limit at this.
The sensor that the utility model embodiment provides also has reusability.Traditional strainometer is single use mode, cannot reuse, and is unfavorable for saving resource and cost.The project organization that the sensor of embodiment is optimized because of it, make sensor after test completion, the glue on application work face 1 and measured piece surface is cleared up with special solvent, get final product removal sensor, and then cleaning sensor workplace 1 residual solvent and glue, so, neither damage sensor, reusable again, significantly reduce cost consumption.
In addition, the sensor that the utility model embodiment provides also has maintainable well.In using, as sensor or circuit damage, only the sensor of damage and circuit need be cleaned out, reinstall sensor for subsequent use at former measuring point place.
The stress strain gauge that the utility model embodiment provides has following technique effect:
More conveniently can measure the parts of compound substance, and reduce urban d evelopment, simplify installation procedure and mounting process, thus expand range of application and application scale; Improve maintainability, reducing can maintenance cost, and can reuse; Volume is little, lightweight, and integration packaging, degree of protection higher (can reach IP54), is easy to transport and stores; There is electromagnetism interference, temperature is supplemented and insulating protection technical finesse, improve measuring accuracy.
The above; be only embodiment of the present utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; change can be expected easily or replace, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of described claim.
Claims (11)
1. a stress strain gauge, is characterized in that, comprises sensitive element (5) and is coated on described sensitive element (5) covering outward, described covering at least partially for compound substance is made.
2. stress strain gauge according to claim 1; it is characterized in that; described covering comprises protection covering (4) and work covering (10); described protection covering (4) or described work covering (10) are provided with groove, and described sensitive element (5) is fixedly installed in described groove.
3. stress strain gauge according to claim 2; it is characterized in that; the one side away from described protection covering (4) of described work covering (10) is the workplace (1) coordinated with measured piece; described protection covering (4) is provided with described groove; described sensitive element (5) is arranged in described groove, and at least one side of described sensitive element (5) and described work covering (10) are fitted.
4. stress strain gauge according to claim 3, it is characterized in that, temperature compensation sheet is also provided with in described groove, described temperature compensation sheet and described sensitive element (5) are arranged side by side, and at least one side of described temperature compensation sheet and described work covering (10) are fitted.
5. stress strain gauge according to claim 3; it is characterized in that; described protection covering (4) is provided with described groove; be provided with electromagnetic screen protective layer (6) between described groove and described sensitive element (5), described electromagnetic screen protective layer (6) covers the surface away from described workplace of described sensitive element (5).
6. stress strain gauge according to claim 1, is characterized in that, also comprises test lead (2), and it is outside that described test lead (2) extend out to described covering.
7. stress strain gauge according to claim 1, is characterized in that, described covering is Composite materials Clad, and described compound substance is fiberglass.
8. stress strain gauge according to claim 2, is characterized in that, the upper shell corresponding with measured piece of described protection covering (4) is provided with installation reference line (3).
9. stress strain gauge according to claim 1, is characterized in that, described covering is provided with multiple mounting hole.
10. stress strain gauge according to claim 2, is characterized in that, by bonding agent (7) bonding between described protection covering (4) and described work covering (10).
11. stress strain gauges as claimed in any of claims 1 to 10, is characterized in that, on the cabin that described stress strain gauge is installed on wind power generating set and/or blade, for measuring the ess-strain value of described cabin and/or blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521013053.3U CN205209670U (en) | 2015-12-08 | 2015-12-08 | Stress and strain sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521013053.3U CN205209670U (en) | 2015-12-08 | 2015-12-08 | Stress and strain sensor |
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| Publication Number | Publication Date |
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| CN205209670U true CN205209670U (en) | 2016-05-04 |
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| CN201521013053.3U Active CN205209670U (en) | 2015-12-08 | 2015-12-08 | Stress and strain sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424238A (en) * | 2015-12-08 | 2016-03-23 | 北京金风科创风电设备有限公司 | Stress strain sensor |
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2015
- 2015-12-08 CN CN201521013053.3U patent/CN205209670U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424238A (en) * | 2015-12-08 | 2016-03-23 | 北京金风科创风电设备有限公司 | Stress strain sensor |
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