CN109612378A - A kind of resistance-strain type displacement meter and preparation method thereof - Google Patents
A kind of resistance-strain type displacement meter and preparation method thereof Download PDFInfo
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- CN109612378A CN109612378A CN201811571253.9A CN201811571253A CN109612378A CN 109612378 A CN109612378 A CN 109612378A CN 201811571253 A CN201811571253 A CN 201811571253A CN 109612378 A CN109612378 A CN 109612378A
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- displacement meter
- erection support
- resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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Abstract
The present invention relates to a kind of resistance-strain type displacement meters and preparation method thereof, the displacement meter includes erection support, substrate, foil gauge and insulating cover, substrate is fixed on erection support, strain gauge adhesion is in substrate, and covered by insulating cover, erection support is equipped with the bolt hole for connecting with measurement target；The production method determines displacement meter range and measurement accuracy the following steps are included: according to measurement target call；Determine foil gauge range and displacement meter gauge length；Substrate cross section form and size are designed, so that substrate is met displacement meter substrate axial compression load requirement and measurement target allows to interfere outer force request；According to target measurement scene, erection support is designed；It based on designed substrate and erection support, is processed using 3D printing, substrate and erection support is integrally formed；It pastes foil gauge and covers insulating cover protection.Compared with prior art, the advantages that present invention has small in size, and measurement accuracy is high, and dynamic response frequency is high.
Description
Technical field
The invention belongs to mechanical engineering fields, more particularly, to a kind of resistance-strain type displacement meter and preparation method thereof.
Background technique
Fax sense displacement measurement common instrument includes inductance type force-displacement meter, type vibration wire displacement meter and resistance-strain type displacement meter
Deng the analog signals such as usual output voltage, electric current or direct output digit signals, analog signal output general precision is reachable
0.25%, digital signal output accuracy reaches as high as 0.1%.It is each that displacement measurement is widely used in each row such as machinery, space flight, building
It is basic measurement project in industry.Therefore, abundant for the displacement meter category of different usage scenarios, but generally there are essences
The problems such as high then volume of degree is big, and then precision small in size is limited or dynamic response frequency is not high.Therefore, it is occupied for displacement meter
Spatial volume is small, precision is high, meets the needs of static(al) and dynamometry simultaneously, needs a kind of novel displacement meter.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of resistance-strain type positions
Move meter and preparation method thereof.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of resistance-strain type displacement meter, including erection support, substrate, foil gauge and insulating cover, the substrate are solid
Due on erection support, the strain gauge adhesion is covered by insulating cover in substrate, and the erection support, which is equipped with, to be used
In the bolt hole being connect with measurement target.
Further, the cross section of the substrate is T-type section.
Further, the erection support and substrate are integrally formed.
Further, the strain gauge adhesion is consistent with displacement meter measurement direction in substrate direction.
The production method for the resistance-strain type displacement meter that the present invention also provides a kind of as described in any, comprising the following steps:
1) according to measurement target call, displacement meter range and measurement accuracy are determined；
2) it is based on the displacement meter range and measurement accuracy, determines foil gauge range and displacement meter gauge length；
3) substrate cross section form and size are designed, substrate is made to meet displacement meter substrate axial compression load requirement and measurement
Target allows to interfere outer force request；
4) according to target measurement scene, erection support is designed；
5) it is based on designed substrate and erection support, is processed using 3D printing, substrate and erection support are integrally formed；
6) it pastes foil gauge and covers insulating cover protection.
Further, the expression formula of the displacement meter gauge length are as follows:
In formula, l is displacement meter gauge length, DFSFor displacement meter range, SFSFor foil gauge range.
Further, the expression formula of the displacement meter substrate axial compression load requirement are as follows:
Fcr≥EASFS
In formula, FcrFor substrate axial compression buckling critical loads, E is based elastic modulus, and A is substrate cross section product, SFS
For foil gauge range.
Further, the measurement target allows to interfere the expression formula of outer force request are as follows:
EASFS≤Fallow
In formula, E is based elastic modulus, and A is substrate cross section product, SFSFor foil gauge range, FallowFor displacement meter measurement
Target jamming external force permissible value.
Further, in the step 4), erection support is designed specifically: design and install according to target measurement scene changes
Shape, material property and the erection support of support and the fastening force of measurement target.
Further, the requirement that the erection support and the fastening force of measurement target meet are as follows:
F≥EASFS
In formula, F is erection support and the fastening force for measuring target, and E is based elastic modulus, and A is substrate cross section product, SFS
For foil gauge range.
Compared with prior art, the present invention have with following the utility model has the advantages that
1) displacement meter of the present invention mainly includes erection support, substrate and foil gauge, small in size, cheap, simple for production；
2) displacement meter erection support and range can adjust, and can adapt to different usage scenarios and range measurement demand；
3) data are acquired using foil gauge, dynamic response frequency is high, good compatibility；
4) substrate is less than substrate axial compression buckling critical loads by the axial compressive force of support, and axial elasticity only occurs and becomes
Shape improves measurement displacement accuracy；
5) substrate deforms can apply certain perturbed force by support to measurement object, and the present invention guarantees the substrate limit
Perturbed force is no more than measurement target jamming power permissible value, ensure that accuracy of measurement；
6) it is formed using 3D printing, is conducive to strict control geometric dimension and mass production, and do not have to 3D printing material
It requires, plastics and metal；
7) there is insulation covering protection measure after strain gauge adhesion, it is ensured that instrument can work normally in harsh environment,
Corresponding safeguard measure can be used to different usage scenarios.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of displacement meter of the present invention；
Fig. 2 is the side view of displacement meter of the present invention；
Fig. 3 is the top view of displacement meter of the present invention；
Fig. 4 is the schematic cross-section in Fig. 2 of the present invention at I-I.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
As shown in Figure 1, the present invention provides a kind of resistance-strain type displacement meter, including erection support 1, substrate 2, foil gauge 3
And insulating cover, substrate 2 are fixed on erection support 1, foil gauge 3 is pasted in substrate 2, and is covered by insulating cover,
Erection support 1 is equipped with the bolt hole for connecting with measurement target, and foil gauge 3 is connect by conducting wire 4 with externally measured instrument.
The production method of above-mentioned resistance-strain type displacement meter the following steps are included:
1) according to measurement target call, displacement meter range and measurement accuracy is determined, displacement meter is made to can adapt to different ranges
Measurement demand.
2) it is based on displacement meter range and measurement accuracy, determines foil gauge range and displacement meter gauge length, foil gauge range and survey
The proportionate relationship of accuracy of measurement is consistent with the proportionate relationship of displacement meter range and measurement accuracy.
The expression formula of displacement meter gauge length are as follows:
In formula, l is displacement meter gauge length, DFSFor displacement meter range, SFSFor foil gauge range.
3) substrate cross section form and size are designed, substrate is made to meet displacement meter substrate axial compression load requirement and measurement
Target allows to interfere outer force request.
Consider that T-type section Compression Stability is good compared with rectangular section, substrate cross section can be designed as to T-type section.
The expression formula of displacement meter substrate axial compression load requirement are as follows:
Fcr≥EASFS (2)
In formula, FcrIt for substrate axial compression buckling critical loads, is calculated by theoretical force equation, E is based elastic mould
Amount, A are substrate cross section product, SFSFor foil gauge range.
Compressive strain is generated when substrate is pressurized, when reaching foil gauge range, substrate is less than substrate axis by the axial compressive force of support
To Compression Stability critical load, guarantee within the scope of measuring range, axial elastic deformation only occurs for substrate, is measured by foil gauge
Strain value multiply gauge length value can be obtained measurement displacement.
Measurement target allows to interfere the expression formula of outer force request are as follows:
EASFS≤Fallow (3)
In formula, E is based elastic modulus, and A is substrate cross section product, SFSFor foil gauge range, FallowFor displacement meter measurement
Target jamming external force permissible value.
Substrate is generated strain by tension and compression, obtains measurement displacement by strain value, substrate deforms can be by support to survey
Amount object applies certain perturbed force, and limit perturbed force, which is no more than measurement target jamming power permissible value, just can guarantee that measurement is accurate
Degree.
4) according to target measurement scene, erection support is designed, shape, material property and peace including designing erection support
It fills support and measures the fastening force of target.Erection support can be according to scene setting, as settable two are symmetrical with substrate two sides
Support.
The requirement that erection support and the fastening force of measurement target meet are as follows:
F≥EASFS (4)
In formula, F is erection support and the fastening force for measuring target, and E is based elastic modulus, and A is substrate cross section product, SFS
For foil gauge range.
Target distortion, which is transmitted to substrate while substrate deformation generates strain by support, can generate certain tension and compression load,
Support fastening force, which is greater than the ultimate load that substrate generates, just can guarantee that support does not slide.
5) it is based on designed substrate and erection support, is processed using 3D printing, substrate and erection support are integrally formed,
Be conducive to accurately control gauge length and mass production, and make full use of the diversity of 3D printing material and to different geometric shapes
Adaptability improves displacement meter to the applicability of different application scene.
6) it pastes foil gauge and covers insulating cover protection.
Strain gauge adhesion is consistent with displacement meter measurement direction in substrate direction, and guarantee, which multiplies gauge length by strain measurement value, to be obtained
Displacement measurement.There is insulation covering protection measure after strain gauge adhesion, guarantees that instrument can work in harsh environment, to not
Same usage scenario can use corresponding safeguard measure.
Embodiment
The circumferential weld of the present embodiment selection tunnel model shaketalle test is measured as target measurement scene, and target range is
0.5mm, required precision 1%.According to measurement target, displacement meter range 0.6mm, precision 0.3% are selected.The selection of 3D printing material
Nylon, elasticity modulus 2.6GPa.Select 20000 microstrain of foil gauge range, precision 0.3%.
The design parameter design of displacement meter each section is as follows in the present embodiment:
Applying equation (1), DFS=0.6mm, SFS=0.02, displacement meter gauge length 30mm is obtained finally.
Selected substrate cross section is T-type section, T-type sectional dimension web width 10mm, thickness 1mm, wing plate width
1.5mm, height 2mm.Applying equation (2), Fcr=801.3N, E=2.6GPa, A=13mm2, SFS=0.02, checking computations meet Fcr=
801.3N≥EASFS=676N.
Displacement meter measures target jamming external force permissible value 1kN, applying equation (3), E=2.6GPa, A=13mm2, SFS=
0.02, Fallow=1kN, checking computations meet EASFS=676N < 1kN.
In the present embodiment, there are two erection support is set, substrate two sides are symmetrically disposed on, erection support is tight with measurement target
Admittedly by the 304 steel metal bars of two diameter 3mm on support, 304 steel shearing strengths take 300MPa, applying equation (4), Fallow=
1350N, E=2.6GPa, A=13mm2, SFS=0.02, checking computations meet F=1350N >=EASFS=676N.
Target usage scenario is that the circumferential weld of tunnel model shaketalle test measures, and contact medium is dry sand and air, is used
704 silicon rubber make covering protection.
The miniature resistance strain-type displacement meter geometric dimension obtained using the design method is accurate, and precision is high, dynamic response
Frequency is high, and simple for production, at low cost, can in high volume make.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be within the scope of protection determined by the claims.
Claims (10)
1. a kind of resistance-strain type displacement meter, which is characterized in that including erection support (1), substrate (2), foil gauge (3) and insulation
Coating, the substrate (2) are fixed on erection support (1), and the foil gauge (3) is pasted on substrate (2), and is covered by insulation
Cap rock covering, the erection support (1) are equipped with the bolt hole for connecting with measurement target.
2. resistance-strain type displacement meter according to claim 1, which is characterized in that the cross section of the substrate (2) is T-type
Section.
3. resistance-strain type displacement meter according to claim 1, which is characterized in that the erection support (1) and substrate (2)
It is integrally formed.
4. resistance-strain type displacement meter according to claim 1, which is characterized in that the foil gauge (3) is pasted onto substrate
Direction is consistent with displacement meter measurement direction.
5. a kind of production method of the resistance-strain type displacement meter as described in claim 1-4 is any, which is characterized in that including with
Lower step:
1) according to measurement target call, displacement meter range and measurement accuracy are determined；
2) it is based on the displacement meter range and measurement accuracy, determines foil gauge range and displacement meter gauge length；
3) substrate cross section form and size are designed, substrate is made to meet displacement meter substrate axial compression load requirement and measurement target
Allow to interfere outer force request；
4) according to target measurement scene, erection support is designed；
5) it is based on designed substrate and erection support, is processed using 3D printing, substrate and erection support are integrally formed；
6) it pastes foil gauge and covers insulating cover protection.
6. the production method of resistance-strain type displacement meter according to claim 5, which is characterized in that the displacement meter gauge length
Expression formula are as follows:
In formula, l is displacement meter gauge length, DFSFor displacement meter range, SFSFor foil gauge range.
7. the production method of resistance-strain type displacement meter according to claim 5, which is characterized in that the displacement meter substrate
The expression formula of axial compression load requirement are as follows:
Fcr≥EASFS
In formula, FcrFor substrate axial compression buckling critical loads, E is based elastic modulus, and A is substrate cross section product, SFSTo answer
Become piece range.
8. the production method of resistance-strain type displacement meter according to claim 5, which is characterized in that the measurement target permits
Perhaps the expression formula of outer force request is interfered are as follows:
EASFS≤Fallow
In formula, E is based elastic modulus, and A is substrate cross section product, SFSFor foil gauge range, FallowTarget is measured for displacement meter
Interfere external force permissible value.
9. the production method of resistance-strain type displacement meter according to claim 5, which is characterized in that in the step 4),
Design erection support specifically: the shape, material property and installation branch of erection support are designed according to target measurement scene changes
The fastening force of seat and measurement target.
10. the production method of resistance-strain type displacement meter according to claim 9, which is characterized in that the erection support
The requirement met with the fastening force of measurement target are as follows:
F≥EASFS
In formula, F is erection support and the fastening force for measuring target, and E is based elastic modulus, and A is substrate cross section product, SFSTo answer
Become piece range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811571253.9A CN109612378A (en) | 2018-12-21 | 2018-12-21 | A kind of resistance-strain type displacement meter and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811571253.9A CN109612378A (en) | 2018-12-21 | 2018-12-21 | A kind of resistance-strain type displacement meter and preparation method thereof |
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| CN109612378A true CN109612378A (en) | 2019-04-12 |
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ID=66009010
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| CN201811571253.9A Pending CN109612378A (en) | 2018-12-21 | 2018-12-21 | A kind of resistance-strain type displacement meter and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595342A (en) * | 2019-09-17 | 2019-12-20 | 中国十九冶集团有限公司 | Automatic measuring device for side slope crack displacement |
| CN114046722A (en) * | 2021-10-12 | 2022-02-15 | 中车唐山机车车辆有限公司 | Displacement meter |
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| CN2176535Y (en) * | 1993-10-22 | 1994-09-07 | 胡光良 | Attached resistor strain sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595342A (en) * | 2019-09-17 | 2019-12-20 | 中国十九冶集团有限公司 | Automatic measuring device for side slope crack displacement |
| CN114046722A (en) * | 2021-10-12 | 2022-02-15 | 中车唐山机车车辆有限公司 | Displacement meter |
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Application publication date: 20190412 |