CN109655364A - A kind of chain-type circumferential deformation extensometer marking apparatus - Google Patents
A kind of chain-type circumferential deformation extensometer marking apparatus Download PDFInfo
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- CN109655364A CN109655364A CN201910139928.0A CN201910139928A CN109655364A CN 109655364 A CN109655364 A CN 109655364A CN 201910139928 A CN201910139928 A CN 201910139928A CN 109655364 A CN109655364 A CN 109655364A
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- capsule
- amesdial
- mounting seat
- top cover
- chain
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- 239000002775 capsule Substances 0.000 claims abstract description 134
- 238000009434 installation Methods 0.000 claims abstract description 39
- 238000004088 simulation Methods 0.000 claims abstract description 32
- 238000007789 sealing Methods 0.000 claims description 18
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 description 15
- 238000012360 testing method Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/62—Manufacturing, calibrating, or repairing devices used in investigations covered by the preceding subgroups
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A kind of chain-type circumferential deformation extensometer marking apparatus, including u-bracket, simulation sample deformation capsule, capsule mounting seat, capsule installation top cover, support post, the first amesdial and the second amesdial；Capsule mounting seat is connected on u-bracket bottom plate, and capsule installation top cover is located at right above capsule mounting seat, and support post is packed in vertically between capsule installation top cover and capsule mounting seat；Sample deformation is simulated with capsule set on the outside of support post, top cover is installed with capsule respectively with capsule both ends for simulation sample deformation and capsule mounting seat is tightly connected；Capsule mounting seat is equipped be connected with capsule inner cavity air inlet and exhaust outlet；Chain-type circumferential deformation extensometer is mounted on simulation sample deformation capsule, and two amesdials are separately mounted on two U-shaped arms of u-bracket, and two amesdial central axes are overlapped and intersect vertically with capsule central axes；The chain top of the measuring head of two amesdials and chain-type circumferential deformation extensometer is by being engaged.
Description
Technical field
The invention belongs to rocks and geotechnical engineering the field of test technology, extend more particularly to a kind of chain-type circumferential deformation
Count marking apparatus.
Background technique
At this stage, in rock test and During Geotechnical Tests, chain-type circumferential deformation extensometer is generallyd use to measure sample
Radial deformation, and chain-type circumferential deformation extensometer generally can using differential transformer (LVDT) be used as measuring unit,
When sample deformation, the chain variation track of chain-type circumferential deformation extensometer is but the differential change along sample circumferencial direction
The measurement track of depressor is the tangential direction of sample circumference, that is to say, that the chain variation track of extensometer and differential transformation
The measurement track of device is not consistent, in this case, at present can only be according to calculation formula (MTS company provides at first) progress
Amendment, to reduce measurement error, and error is how many actually, whoever can not provide specific value at present.
Therefore, if true sample radial deformation measurement error cannot be provided, the accurate of Poisson's ratio will be directly influenced
Property, while also influencing whether that the body of sample becomes accuracy, and the error of these data will be directly influenced to sample physics spy
The definition of property.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of chain-type circumferential deformation extensometer marking apparatus, can
The measurement accuracy for accurately calibrating chain-type circumferential deformation extensometer, can provide the true of chain-type circumferential deformation extensometer
Measurement error.
To achieve the goals above, the present invention adopts the following technical scheme: a kind of chain-type circumferential deformation extensometer is demarcated
Instrument, including u-bracket, simulation sample deformation capsule, capsule mounting seat, capsule install top cover, support post, the 1000th point
Table and the second amesdial；The capsule mounting seat is bolted to connection on the bottom plate of u-bracket, the capsule installation
Top cover is located at right above capsule mounting seat, the support post be packed in vertically capsule installation top cover and capsule mounting seat it
Between；The simulation sample deformation with capsule set on the outside of support post, install by simulation sample deformation capsule top and capsule
Top seal links together, and simulation sample deformation is sealed connected together with capsule bottom end and capsule mounting seat；Described
Be respectively arranged with air inlet and exhaust outlet in capsule mounting seat, air inlet and exhaust outlet with simulation sample deformation capsule
Inner cavity is connected；The simulation sample deformation capsule is for installing chain-type circumferential deformation extensometer；First amesdial
It is separately mounted on two U-shaped arms of u-bracket with the second amesdial, the central axes of the first amesdial and the second amesdial are mutually overlapped
It closes, and the central axes of the first amesdial and the second amesdial and the central axes of simulation sample deformation capsule intersect vertically；It is described
The chain top of the measuring head of first amesdial and the second amesdial and chain-type circumferential deformation extensometer is by being engaged.
The support post uses three-level ladder straight-bar structure, and the bottom end of support post is first order straight-bar, and the first order is straight
The outer surface of bar is machined with external screw thread, is threaded hole at the upper surface center of the capsule mounting seat, support post
First order straight-bar carries out the fixation that is spirally connected by the upper surface screwed hole of centre of external screw thread and capsule mounting seat；It is installed positioned at capsule
It is second level straight-bar in the middle part of support post between pedestal and capsule installation top cover；The top of the support post is that the third level is straight
Bar offers through-hole at the center of capsule installation top cover, third level straight-bar pass through the central through hole of capsule installation top cover and
It extending to above capsule installation top cover, the outer surface of the third level straight-bar above capsule installation top cover is machined with external screw thread,
Sealing ring is provided between the central through hole and third level straight-bar of capsule installation top cover；The capsule installation top cover is straight by the third level
The cascaded surface of bar carries out axial limiting；It is sequentially installed with washer and fastening nut on the third level straight-bar, it is tight by screwing
Gu nut is fixed the third level straight-bar cascaded surface of capsule installation top cover and support post.
The simulation sample deformation uses cylindrical structure with capsule, simulates the bottom end Nang Kou and glue of sample deformation capsule
The first compression sealing ring is fixed between capsule mounting seat upper surface, first, which compresses sealing ring, passes through bolt and capsule mounting seat
It is fixedly connected；The second pressure is fixed between the top Nang Kou and capsule installation top cover lower surface of the simulation sample deformation capsule
Close seal ring, the second compression sealing ring are installed top cover with capsule by bolt and are fixedly connected.
The first amesdial jack and the second amesdial jack are offered respectively on two U-shaped arms of the u-bracket；Institute
It states the first amesdial to be inserted into the first amesdial jack by its measuring rod, the measuring rod of the first amesdial and the first amesdial
First protection sleeve is installed between jack, is provided with the positioning of the first amesdial in the U-shaped arm above the first protection sleeve
Pin is fixed the position of the first amesdial by screwing the first amesdial shop bolt；Second amesdial passes through
Its measuring rod is inserted into the second amesdial jack, and is equipped between the measuring rod of the second amesdial and the second amesdial jack
Two protection sleeves are provided with the second amesdial shop bolt in the U-shaped arm above the second protection sleeve, by screwing second
The position of the second amesdial is fixed in amesdial shop bolt.
Beneficial effects of the present invention:
Chain-type circumferential deformation extensometer marking apparatus of the invention, can accurately calibrate chain-type circumferential deformation and extend
The measurement accuracy of meter can provide the true measurement error of chain-type circumferential deformation extensometer, for promoting rock/rock mass test
The testing level of machine can play an important role.The present invention also has that structure is simple, conceives unique, low in cost, practicability
Strong feature.
Detailed description of the invention
Fig. 1 is a kind of front view of chain-type circumferential deformation extensometer marking apparatus of the invention；
Fig. 2 is a kind of top view of chain-type circumferential deformation extensometer marking apparatus of the invention；
In figure, 1-u-bracket, 2-simulation sample deformation capsules, 3-capsule mounting seats, 4-capsules installation top
Lid, 5-support posts, the 6-the first amesdial, the 7-the second amesdial, 8-air inlets, 9-exhaust outlets, 10-washers, 11-
Fastening nut, 12-the first compresses sealing ring, and 13-the second compresses sealing ring, the 14-the first protection sleeve, and 15-the one thousand point
Table shop bolt, the 16-the second protection sleeve, the 17-the second amesdial shop bolt, 18-sealing rings, 19-chains, 20-is poor
Dynamic transformer.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, 2, a kind of chain-type circumferential deformation extensometer marking apparatus, including u-bracket 1, simulation sample deformation
With capsule 2, capsule mounting seat 3, capsule installation top cover 4, support post 5, the first amesdial 6 and the second amesdial 7；The glue
Capsule mounting seat 3 is bolted to connection on the bottom plate of u-bracket 1, and the capsule installation top cover 4 is located at capsule installation bottom
Right above seat 3, the support post 5 is packed in vertically between capsule installation top cover 4 and capsule mounting seat 3；The simulation examination
Sample deformation capsule 2 is sleeved on 5 outside of support post, and simulation sample deformation 2 top of capsule and the capsule installation sealing of top cover 4 connect
It is connected together, simulation 2 bottom end of sample deformation capsule is sealed connected together with capsule mounting seat 3；It is installed in the capsule
Air inlet 8 and exhaust outlet 9 are respectively arranged on pedestal 3, air inlet 8 and exhaust outlet 9 are with simulation sample deformation in capsule 2
Chamber is connected；The simulation sample deformation capsule 2 is for installing chain-type circumferential deformation extensometer；First amesdial 6
It is separately mounted on two U-shaped arms of u-bracket 1 with the second amesdial 7, the central axes of the first amesdial 6 and the second amesdial 7
It coincides, and the central axes of the first amesdial 6 and the second amesdial 7 phase vertical with the simulation central axes of sample deformation capsule 2
It hands over；The measuring head of first amesdial 6 and the second amesdial 7 is abutted against with the chain 19 of chain-type circumferential deformation extensometer and is contacted
Cooperation.
The support post 5 uses three-level ladder straight-bar structure, and the bottom end of support post 5 is first order straight-bar, the first order
The outer surface of straight-bar is machined with external screw thread, is threaded hole, support post at the upper surface center of the capsule mounting seat 3
5 first order straight-bar carries out the fixation that is spirally connected by the upper surface screwed hole of centre of external screw thread and capsule mounting seat 3；Positioned at capsule
It is second level straight-bar in the middle part of support post 5 between mounting seat 3 and capsule installation top cover 4；The top of the support post 5 is
Third level straight-bar offers through-hole at the center of capsule installation top cover 4, and third level straight-bar passes through capsule installation top cover 4
Central through hole and capsule installation top cover 4 top is extended to, the outer surface of the third level straight-bar above capsule installation top cover 4 adds
Work has external screw thread, is provided with sealing ring 18 between the central through hole and third level straight-bar of capsule installation top cover 4；The capsule installation
Top cover 4 carries out axial limiting by the cascaded surface of third level straight-bar；Washer 10 and tight is sequentially installed on the third level straight-bar
Gu nut 11 presses capsule installation top cover 4 and the third level straight-bar cascaded surface of support post 5 by screwing fastening nut 11
It fastens.
The simulation sample deformation with capsule 2 use cylindrical structure, simulate sample deformation capsule 2 bottom end Nang Kou with
The first compression sealing ring 12 is fixed between 3 upper surface of capsule mounting seat, first, which compresses sealing ring 12, passes through bolt and capsule
Mounting seat 3 is fixedly connected；Between top Nang Kou and capsule installation 4 lower surface of top cover of the simulation sample deformation capsule 2
It is fixed with the second compression sealing ring 13, the second compression sealing ring 13 is installed top cover 4 with capsule by bolt and is fixedly connected.
The first amesdial jack and the second amesdial jack are offered respectively on two U-shaped arms of the u-bracket 1；
First amesdial 6 is inserted into the first amesdial jack by its measuring rod, the measuring rod and the 1000th of the first amesdial 6
Divide between table jack and the first protection sleeve 14 is installed, is provided with the 1000th in the U-shaped arm above the first protection sleeve 14
Divide table shop bolt 15, the position of first amesdial 6 is fixed by screwing the first amesdial shop bolt 15；Described
Two amesdials 7 are inserted into the second amesdial jack by its measuring rod, and the measuring rod and the second amesdial of the second amesdial 7 are inserted
Second protection sleeve 16 is installed, it is fixed to be provided with the second amesdial in the U-shaped arm above the second protection sleeve 16 between hole
Position pin 17, is fixed the position of the second amesdial 7 by screwing the second amesdial shop bolt 17.
Illustrate use process of the invention with reference to the accompanying drawing:
In the present embodiment, the resolution ratio of the first amesdial 6 and the second amesdial 7 is 0.1 micron, full scale 12.5mm,
Measurement accuracy is lower 7 microns of full scale.
Before calibration starts, first the exhaust outlet 9 in capsule mounting seat 3 is closed, then passes through air inlet 8 to simulation
It is inflated in the sample deformation cavity of capsule 2, until capsule diameter reaches design requirement.
First chain-type circumferential deformation extensometer to be calibrated is installed on simulation sample deformation capsule 2, then to chain
Differential transformer on formula circumferential deformation extensometer is adjusted, and the range of differential transformer is made to be in capsule deformation range
It is interior.
The first amesdial 6 and the second amesdial 7 are installed in place respectively, the measuring head of amesdial is made to act against chain-type ring
To on the chain of deformation extensometer, then successively return to zero to the first amesdial 6 and the second amesdial 7.
Next, the gas injection into capsule with certain aeration speed, to control the deformation velocity of capsule, when the deformation of capsule
After amount reaches predetermined value, stops gas injection, the reading of the first amesdial 6 and the second amesdial 7 is recorded, by the reading of two amesdials
Number summation, so that it may obtain the true radial-deformation of capsule, while record the differential change of chain-type circumferential deformation extensometer
The data that depressor measures, then the true radial-deformation of data and capsule that differential transformer measures is compared, so that it may really
The measurement error of the fixed chain-type circumferential deformation extensometer.
In order to keep the measurement error obtained more accurate, which can be carried out repeating mark
It is fixed, and average to multiple measurement error obtained by calibrating, finally using the average value of measurement error as chain-type circumferential direction
Deform the calibrated error of extensometer.
When the radial deformation measurement by the calibrated chain-type circumferential deformation extensometer of the present invention for authentic sample,
Due to having realised that true sample radial deformation measurement error in advance, thus be effectively ensured Poisson's ratio accuracy and
The body of sample becomes accuracy.
The scope of patent protection that scheme in embodiment is not intended to limit the invention, it is all without departing from carried out by the present invention etc.
Effect implements or change, is both contained in the scope of the patents of this case.
Claims (4)
1. a kind of chain-type circumferential deformation extensometer marking apparatus, it is characterised in that: including u-bracket, simulation sample deformation glue
Capsule, capsule mounting seat, capsule installation top cover, support post, the first amesdial and the second amesdial；The capsule mounting seat
It is bolted to connection on the bottom plate of u-bracket, the capsule installation top cover is located at right above capsule mounting seat, described
Support post is packed in vertically between capsule installation top cover and capsule mounting seat；The simulation sample deformation is mounted in capsule set
On the outside of support post, simulation sample deformation is linked together with capsule top and capsule installation top seal, simulates sample deformation
It is sealed connected together with capsule bottom end and capsule mounting seat；Be respectively arranged in the capsule mounting seat air inlet and
Exhaust outlet, air inlet and exhaust outlet are connected with the inner cavity of simulation sample deformation capsule；The simulation sample deformation glue
Capsule is for installing chain-type circumferential deformation extensometer；First amesdial and the second amesdial are separately mounted to u-bracket
On two U-shaped arms, the central axes of the first amesdial and the second amesdial coincide, and in the first amesdial and the second amesdial
The central axes of axis and simulation sample deformation capsule intersect vertically；The measuring head of first amesdial and the second amesdial with
The chain top of chain-type circumferential deformation extensometer is by being engaged.
2. a kind of chain-type circumferential deformation extensometer marking apparatus according to claim 1, it is characterised in that: the support is vertical
Column uses three-level ladder straight-bar structure, and the bottom end of support post is first order straight-bar, and the outer surface of first order straight-bar is machined with outer
Screw thread is threaded hole at the upper surface center of the capsule mounting seat, and the first order straight-bar of support post passes through outer spiral shell
Line and the upper surface screwed hole of centre of capsule mounting seat carry out the fixation that is spirally connected；Top cover is installed positioned at capsule mounting seat and capsule
Between support post in the middle part of be second level straight-bar；The top of the support post is third level straight-bar, is installed in the capsule
The center of top cover offers through-hole, and third level straight-bar passes through the central through hole of capsule installation top cover and extends to capsule installation top cover
The outer surface of top, the third level straight-bar above capsule installation top cover is machined with external screw thread, and capsule installs the center of top cover
Sealing ring is provided between through-hole and third level straight-bar；The capsule installation top cover is carried out axial by the cascaded surface of third level straight-bar
Limit；It is sequentially installed with washer and fastening nut on the third level straight-bar, makes capsule installation top by screwing fastening nut
It covers and is fixed with the third level straight-bar cascaded surface of support post.
3. a kind of chain-type circumferential deformation extensometer marking apparatus according to claim 1, it is characterised in that: the simulation examination
Sample deformation with capsule use cylindrical structure, simulate sample deformation capsule bottom end Nang Kou and capsule mounting seat upper surface it
Between be fixed with the first compression sealing ring, the first compression sealing ring is fixedly connected by bolt with capsule mounting seat；The simulation
It is fixed with the second compression sealing ring between top Nang Kou and capsule installation the top cover lower surface of sample deformation capsule, second compresses
Sealing ring is installed top cover with capsule by bolt and is fixedly connected.
4. a kind of chain-type circumferential deformation extensometer marking apparatus according to claim 1, it is characterised in that: described U-shaped
The first amesdial jack and the second amesdial jack are offered respectively on two U-shaped arms of bracket；First amesdial passes through
Its measuring rod is inserted into the first amesdial jack, and is equipped between the measuring rod of the first amesdial and the first amesdial jack
One protection sleeve is provided with the first amesdial shop bolt in the U-shaped arm above the first protection sleeve, by screwing first
The position of the first amesdial is fixed in amesdial shop bolt；Second amesdial is inserted into second by its measuring rod
In amesdial jack, the second protection sleeve is installed between the measuring rod of the second amesdial and the second amesdial jack, is located at the
It is provided with the second amesdial shop bolt in U-shaped arm above two protection sleeves, by screwing the second amesdial shop bolt pair
The position of second amesdial is fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910139928.0A CN109655364A (en) | 2019-02-26 | 2019-02-26 | A kind of chain-type circumferential deformation extensometer marking apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910139928.0A CN109655364A (en) | 2019-02-26 | 2019-02-26 | A kind of chain-type circumferential deformation extensometer marking apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109655364A true CN109655364A (en) | 2019-04-19 |
Family
ID=66123637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910139928.0A Pending CN109655364A (en) | 2019-02-26 | 2019-02-26 | A kind of chain-type circumferential deformation extensometer marking apparatus |
Country Status (1)
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT985168B (en) * | 1972-05-19 | 1974-11-30 | Euratom | CAPSULE FOR CONTAINING MATERIAL SAMPLES |
| JPS5451550A (en) * | 1977-09-29 | 1979-04-23 | Shimadzu Corp | Automatic calibrator of extensometers |
| CN201611350U (en) * | 2009-12-18 | 2010-10-20 | 重庆建设工业(集团)有限责任公司 | Magnetic-suspension high-speed measuring instrument calibrating device |
| CN103954262A (en) * | 2014-05-07 | 2014-07-30 | 范鹏贤 | Device for measuring radial deformation of cylindrical test piece |
| CN203758495U (en) * | 2014-03-24 | 2014-08-06 | 长江水利委员会长江科学院 | Clamping device suitable for rock deformation testing sensor calibration |
| CN204758390U (en) * | 2015-07-30 | 2015-11-11 | 中冶集团武汉勘察研究院有限公司 | Rock test piece lateral deformation surveys gauge stand frame |
| CN105651240A (en) * | 2016-03-03 | 2016-06-08 | 重庆建设工业(集团)有限责任公司 | Extensometer calibration device |
| CN208520713U (en) * | 2018-06-28 | 2019-02-19 | 湖北省计量测试技术研究院 | A kind of extensometer marking apparatus |
| CN209589743U (en) * | 2019-02-26 | 2019-11-05 | 长春市镨策试验仪器有限责任公司 | A kind of chain-type circumferential deformation extensometer marking apparatus |
-
2019
- 2019-02-26 CN CN201910139928.0A patent/CN109655364A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT985168B (en) * | 1972-05-19 | 1974-11-30 | Euratom | CAPSULE FOR CONTAINING MATERIAL SAMPLES |
| JPS5451550A (en) * | 1977-09-29 | 1979-04-23 | Shimadzu Corp | Automatic calibrator of extensometers |
| CN201611350U (en) * | 2009-12-18 | 2010-10-20 | 重庆建设工业(集团)有限责任公司 | Magnetic-suspension high-speed measuring instrument calibrating device |
| CN203758495U (en) * | 2014-03-24 | 2014-08-06 | 长江水利委员会长江科学院 | Clamping device suitable for rock deformation testing sensor calibration |
| CN103954262A (en) * | 2014-05-07 | 2014-07-30 | 范鹏贤 | Device for measuring radial deformation of cylindrical test piece |
| CN204758390U (en) * | 2015-07-30 | 2015-11-11 | 中冶集团武汉勘察研究院有限公司 | Rock test piece lateral deformation surveys gauge stand frame |
| CN105651240A (en) * | 2016-03-03 | 2016-06-08 | 重庆建设工业(集团)有限责任公司 | Extensometer calibration device |
| CN208520713U (en) * | 2018-06-28 | 2019-02-19 | 湖北省计量测试技术研究院 | A kind of extensometer marking apparatus |
| CN209589743U (en) * | 2019-02-26 | 2019-11-05 | 长春市镨策试验仪器有限责任公司 | A kind of chain-type circumferential deformation extensometer marking apparatus |
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