CN106644707A - Extension measuring device and method applicable to high-temperature and high-pressure environments - Google Patents
Extension measuring device and method applicable to high-temperature and high-pressure environments Download PDFInfo
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- CN106644707A CN106644707A CN201610955333.9A CN201610955333A CN106644707A CN 106644707 A CN106644707 A CN 106644707A CN 201610955333 A CN201610955333 A CN 201610955333A CN 106644707 A CN106644707 A CN 106644707A
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- 238000000034 method Methods 0.000 title abstract description 8
- 238000006073 displacement reaction Methods 0.000 claims abstract description 51
- 238000001816 cooling Methods 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 47
- 238000005259 measurement Methods 0.000 claims description 29
- 239000000498 cooling water Substances 0.000 claims description 13
- 238000000691 measurement method Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 9
- 239000002826 coolant Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 9
- 238000002474 experimental method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 235000019628 coolness Nutrition 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- 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
-
- 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
- G01N3/02—Details
- G01N3/04—Chucks
-
- 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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- 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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses an extension measuring device and method applicable to high-temperature and high-pressure environments. The device comprises two fixing clamps, two vertical rods, two cooling devices and two LVDT (linear variable differential transformer) displacement sensors, a sample is located in a kettle body, one end of each of the two fixing clamps is fixed on each of upper and lower bosses of the sample, the other end of each of the two fixing clamps is fixed with each of two vertical rods, the two cooling devices are mounted on a kettle cover, the two LVDT displacement sensors are mounted in the two cooling devices, and sensing magnets in the two LVDT displacement sensors are connected with the two vertical rods extending out of the kettle body. Errors caused by deformation of loading rods of loading devices in traditional schemes are avoided by the aid of the fixing clamps, the vertical rods and the LVDT displacement sensors, the LVDT displacement sensors are protected by the cooling devices, and the measurementaccuracy is thus improved.
Description
Technical field
The present invention relates to detection field, more particularly to a kind of extension measurement device and side suitable under high temperature and high pressure environment
Method.
Background technology
Stress corrosion (cracking) test equipment is generally used for the performance test of material under corrosive medium environment, is simulation material in reality
Performance under the applying working condition of border, needs to be equipped with high temperature and pressure experiment kettle on testing equipment.During test, metal material sample is installed
In closed experiment kettle, it is connected with the charger of outside by a load bar.And due to testing the environmental condition in kettle
Harshness, the sensor of general measure elongation can not be used in it.
For the measurement of the sample elongation in high temperature and pressure experiment kettle, direct measurement scheme is currently there are no, great majority are adopted
With the method for indirect measurement.The charger of ordinary test equipment outside experiment kettle, deeply test kettle and be connected with sample by load bar,
During loading, the elongation of sample and the displacement near-synchronous of load bar.Displacement transducer is installed on load bar outside experiment kettle, is kept away
Exempt from contact high temperature and high pressure environment, the displacement of load bar can have been measured, be approximately equal to sample elongation.
Indirect measurement method is the imagination of the elongation Complete Synchronization based on load bar displacement and sample, and in fact, loading
Can there is certain gap in the annexation between bar and sample, this is especially apparent in fatigue test.On the other hand, sample adds
During load, produce strain elongation is not only sample, and the fixture being connected with sample and load bar can all produce deformation, survey indirectly
Amount method also includes the elongation of this part, causes final measurement simultaneously inaccurate.
The content of the invention
In order to solve above-mentioned technical problem, the present invention provides a kind of elongation suitable under high temperature and high pressure environment and surveys
Amount device.
The technical solution adopted in the present invention is：
A kind of extension measurement device suitable under high temperature and high pressure environment, including two groups of geometrical clamps, two groups of vertical rods, two sets it is cold
But device and two sets of LVDT displacement transducers, sample is located inside kettle, and one end of geometrical clamp is separately fixed at examination described in two groups
On two boss up and down of sample, the other end of geometrical clamp described in two groups is fixed respectively with vertical rod described in two groups, two sets of coolings
Device is arranged on kettle cover, and two sets of LVDT displacement transducers are separately mounted to inside two sets of cooling devices, two sets of institutes
State the induced magnet inside LVDT displacement transducers to be connected with vertical rod described in two groups stretched from the kettle respectively.
As a kind of improvement of the extension measurement device suitable under high temperature and high pressure environment of the present invention, the cooling
Device includes water jacket body and water jacket shell, and the LVDT displacement transducers are arranged on portion in the water jacket body, the water jacket body with
The kettle cover is threadedly coupled and by metal end face seal, and the outer surface of the water jacket body is provided with helicla flute, the water jacket body
The inside of the water jacket shell is coaxially set in, described spiral fluted one end is provided with cooling water inlet, and the other end is provided with cooling water
Outlet.
As a kind of improvement of the extension measurement device suitable under high temperature and high pressure environment of the present invention, the water jacket
Gap between body and the water jacket shell is sealed by sealing ring.
As a kind of improvement of the extension measurement device suitable under high temperature and high pressure environment of the present invention, the water jacket
Shell is fixed on the water jacket body by locking nut.
As a kind of improvement of the extension measurement device suitable under high temperature and high pressure environment of the present invention, the fixation
Press from both sides as opposite opened, its one end is held tightly on the boss of sample by screw, and the other end is clamped the vertical rod by screw.
In order to solve above-mentioned technical problem, present invention also offers a kind of extension measurement suitable under high temperature and high pressure environment
Method.
A kind of extension measurement method suitable under high temperature and high pressure environment, using extension measurement device described above, institute
Stating extension measurement method includes：
The cooling device is cooled down to the LVDT displacement transducers；
Charger is opposite to the sample inside kettle and is loaded, and makes sample produce strain elongation；
The LVDT positions that what sample stretching was produced be displaced through the geometrical clamp and the vertical rod is transferred to outside kettle
On the induced magnet of displacement sensor；
The LVDT displacement transducers are corresponding so as to obtain according to the displacement output voltage signal of the induced magnet
The displacement of the vertical rod；
The displacement that vertical rod described in two groups is produced is obtained the tensile elongation of sample Jing after being added or subtract each other.
As a kind of improvement of the extension measurement method suitable under high temperature and high pressure environment of the present invention, the cooling
Device is cooled down to the LVDT displacement transducers, is specifically included：Cooling water is persistently passed through described from the cooling water inlet
In helicla flute, and flow out from the coolant outlet.
The present invention Advantageous Effects be：
In the middle of prior art, there is certain gap in the annexation between load bar and sample, and during sample loading, with
The fixture and load bar of sample connection can produce deformation, particularly evident in fatigue experiment, cause final measurement inaccurate,
The present invention is positioned at the measurement point of sensor on sample, excludes other disturbing factors, greatly improves certainty of measurement；
This measurement apparatus and method are simple, economical and practical, and being installed on for LVDT displacement transducers safeguards very convenient, solution
Determined in HTHP water environment cannot the elongation of direct measurement sample difficult point；
Helicla flute is provided with water jacket body, is on the one hand easy to flow of cooling water, on the other hand increase the area of heat exchange,
Simple structure, cooling-down effect substantially, and does not affect to test the hot environment in kettle.
Certainly, the arbitrary product for implementing the present invention it is not absolutely required to while reaching all the above advantage.
Description of the drawings
Fig. 1 is the front view of extension measurement device of the present invention；
Fig. 2 is the top view of geometrical clamp of the present invention.
In figure, 1- kettlies；2- samples；3- geometrical clamps；4- vertical rods；5- kettle covers；6- water jacket bodies；7- sealing rings；Outside 8- water jackets
Shell；9- induced magnets；10- sealing rings；11- locking nuts；12- sealing rings；13-LVDT displacement transducers.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with each reality of the accompanying drawing to the present invention
The mode of applying is explained in detail.
Such as Fig. 1, a kind of extension measurement device suitable under high temperature and high pressure environment, including two groups of geometrical clamps, 3, two groups of vertical rods
4th, two sets of cooling devices and two sets of LVDT displacement transducers 13, sample 2 is located inside kettle 1, one end difference of two groups of geometrical clamps 3
It is fixed on two boss up and down of sample 2, the other end of two groups of geometrical clamps 3 is fixed respectively with two groups of vertical rods 4, two sets of cooling dresses
Put on kettle cover 5, two sets of LVDT displacement transducers 13 are separately mounted to inside two sets of cooling devices, two sets of LVDT displacements are passed
Induced magnet 9 inside sensor 13 is connected respectively with the two groups of vertical rods 4 stretched from kettle 1.LVDT displacement transducers 13 are resistance to
High pressure, but the high temperature being unable in tolerance test kettle, therefore need that a cooling device is installed on kettle cover 5.LVDT displacement transducers
13 I＆M is very convenient.
In another embodiment of the invention, cooling device includes water jacket body 6 and water jacket shell 8, LVDT displacement transducers
13 are arranged on inside water jacket body 6, and water jacket body 6 is threadedly coupled and by metal end face seal, the appearance of water jacket body 6 with kettle cover 5
Face is provided with helicla flute, and water jacket body 6 is coaxially set in the inside of water jacket shell 8, and spiral fluted one end is provided with cooling water inlet, another
End is provided with coolant outlet.During work, from A mouths cooling water is continually fed into, cooling water flows through the helicla flute on water jacket body, and from B
Mouth flows out, and makes water jacket body 6 keep low-temperature condition, and water jacket body 6 passes through heat exchange, the high-temperature water around LVDT displacement transducers 13
Acceptable temperature is reduced to, LVDT displacement transducers 13 just can normal work.Because water jacket body 6 is used for by the logical of vertical rod 4
Road is very tiny so that the water temperature being lowered around LVDT displacement transducers 13 is difficult to have influence on inside kettle 1, can make experiment kettle
Interior water temperature keep uniformly with it is constant.
Cooling device includes water jacket body 6 and water jacket shell 8, and water jacket body 6 is provided with helicla flute, is on the one hand easy to cool down current
It is dynamic, the area of heat exchange is on the other hand increased, simple structure, cooling-down effect substantially, and does not affect to test the high temperature ring in kettle
Border.
In another embodiment of the invention, the gap between water jacket body 6 and water jacket shell 8 is by sealing ring 7 and sealing
Circle 10 is sealed.Sealing ring 7 and sealing ring 10 can effectively prevent cooling water from oozing out from gap, so as to ensure cooling effect.
In another embodiment of the invention, water jacket shell 8 is fixed on water jacket body 6 by locking nut 11.
In another embodiment of the invention, as shown in Fig. 2 geometrical clamp 3 is opposite opened, its one end is by screw b and spiral shell
Nail c is held tightly on the boss of sample 2, and the other end is clamped vertical rod 4 by screw a.
A kind of extension measurement method suitable under high temperature and high pressure environment, using above-mentioned extension measurement device, extension measurement
Method includes：
Cooling device is cooled down to LVDT displacement transducers 13；
Charger is opposite to the sample 2 inside kettle 1 and is loaded, and makes sample 2 produce strain elongation；
The LVDT displacement transducers that what the stretching of sample 2 was produced be displaced through geometrical clamp 3 and vertical rod 4 is transferred to outside kettle 1
On 13 induced magnet 9；
LVDT displacement transducers 13 according to the displacement output voltage signal of induced magnet 9, so as to obtain corresponding vertical rod 4
Displacement；
The displacement of two groups of generations of vertical rod 4 is obtained the tensile elongation of sample 2 Jing after being added or subtract each other.
In another embodiment of the invention, cooling device is cooled down to LVDT displacement transducers 13, is specifically included：It is cold
But water continues to be passed through in helicla flute from cooling water inlet, and flows out from coolant outlet.
The present invention transmits the stretching displacement of sample 2 by geometrical clamp 3 and vertical rod 4, it is to avoid using load bar produce deformation
Technological deficiency, and LVDT displacement transducers 13 are protected by cooling device, directly by the measurement point location of sensor
On sample 2, greatly improve certainty of measurement.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any those familiar with the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
All should be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is defined.
Claims (7)
1. a kind of extension measurement device suitable under high temperature and high pressure environment, it is characterised in that：Stand including two groups of geometrical clamps, two groups
Bar, two sets of cooling devices and two sets of LVDT displacement transducers, sample is located inside kettle, one end difference of geometrical clamp described in two groups
It is fixed on two boss up and down of sample, the other end of geometrical clamp described in two groups is fixed respectively with vertical rod described in two groups, two sets
The cooling device is arranged on kettle cover, and two sets of LVDT displacement transducers are separately mounted in two sets of cooling devices
Portion, the induced magnet inside two sets of LVDT displacement transducers respectively with vertical rod described in two groups stretched from the kettle
Correspondence connection.
2. a kind of extension measurement device suitable under high temperature and high pressure environment according to claim 1, it is characterised in that：Institute
Cooling device is stated including water jacket body and water jacket shell, the LVDT displacement transducers are arranged on portion in the water jacket body, the water
Body is threadedly coupled with the kettle cover and by metal end face seal, the outer surface of the water jacket body is provided with helicla flute, described
Water jacket body is coaxially set in the inside of the water jacket shell, and described spiral fluted one end is provided with cooling water inlet, and the other end is provided with
Coolant outlet.
3. a kind of extension measurement device suitable under high temperature and high pressure environment according to claim 2, it is characterised in that：Institute
The gap stated between water jacket body and the water jacket shell is sealed by sealing ring.
4. a kind of extension measurement device suitable under high temperature and high pressure environment according to claim 2, it is characterised in that：Institute
State water jacket shell to be fixed on the water jacket body by locking nut.
5. a kind of extension measurement device suitable under high temperature and high pressure environment according to claim 1, it is characterised in that：Institute
It is opposite opened to state geometrical clamp, and its one end is held tightly on the boss of sample by screw, and the other end is pressed from both sides the vertical rod by screw
Tightly.
6. a kind of extension measurement method suitable under high temperature and high pressure environment, it is characterised in that be applied to claim 1-5 arbitrary
Extension measurement device described in, the extension measurement method includes：
The cooling device is cooled down to the LVDT displacement transducers；
Charger is opposite to the sample inside kettle and is loaded, and makes sample produce strain elongation；
The LVDT displacements that what sample stretching was produced be displaced through the geometrical clamp and the vertical rod is transferred to outside kettle are passed
On the induced magnet of sensor；
The LVDT displacement transducers are corresponding described so as to obtain according to the displacement output voltage signal of the induced magnet
The displacement of vertical rod；
The displacement that vertical rod described in two groups is produced is obtained the tensile elongation of sample Jing after being added or subtract each other.
7. a kind of extension measurement method suitable under high temperature and high pressure environment according to claim 6, it is characterised in that institute
State cooling device to cool down the LVDT displacement transducers, specifically include：Cooling water continues logical from the cooling water inlet
In entering the helicla flute, and flow out from the coolant outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610955333.9A CN106644707A (en) | 2016-10-27 | 2016-10-27 | Extension measuring device and method applicable to high-temperature and high-pressure environments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610955333.9A CN106644707A (en) | 2016-10-27 | 2016-10-27 | Extension measuring device and method applicable to high-temperature and high-pressure environments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106644707A true CN106644707A (en) | 2017-05-10 |
Family
ID=58821529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610955333.9A Pending CN106644707A (en) | 2016-10-27 | 2016-10-27 | Extension measuring device and method applicable to high-temperature and high-pressure environments |
Country Status (1)
| Country | Link |
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| CN (1) | CN106644707A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764649A (en) * | 2017-11-28 | 2018-03-06 | 郑州大学 | Tensile deformation test device and its deformation-sensor fixture in concrete sample high temperature |
| CN108931440A (en) * | 2017-05-27 | 2018-12-04 | 核工业西南物理研究院 | A kind of small sample is uniaxially stretched creep test fixture |
| CN109012495A (en) * | 2018-09-20 | 2018-12-18 | 西安力创材料检测技术有限公司 | The device of dynamic monitoring deformation index under a kind of high-temperature and high-pressure conditions in reaction kettle |
| CN110553937A (en) * | 2019-09-18 | 2019-12-10 | 哈尔滨工业大学 | tensile-tensile fatigue testing device for fiber rod body and fatigue performance evaluation method |
| CN113369506A (en) * | 2021-05-21 | 2021-09-10 | 深圳市爱贝科精密工业股份有限公司 | Front end cooling type oil-gas lubrication electric spindle with displacement sensor |
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| CN103557784A (en) * | 2013-11-07 | 2014-02-05 | 中国科学院金属研究所 | Normal position real-time monitoring system for high-temperature and high-pressure water fatigue testing specimen scale distance section strain |
| CN103822573A (en) * | 2014-02-27 | 2014-05-28 | 东北大学 | Device and method for measuring size deformation of rock sample |
| CN105092372A (en) * | 2015-09-17 | 2015-11-25 | 西安热工研究院有限公司 | System and method for monitoring metal sample stress in high-temperature and high-pressure environment in real time |
| CN206132512U (en) * | 2016-10-27 | 2017-04-26 | 上海凯尔孚应力腐蚀试验设备有限公司 | Extension measuring device suitable for under high temperature and high pressure environment |
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| CN202485997U (en) * | 2012-03-28 | 2012-10-10 | 天津大学 | Superminiature minimally-invasive high-temperature creep fatigue testing machine |
| CN103557784A (en) * | 2013-11-07 | 2014-02-05 | 中国科学院金属研究所 | Normal position real-time monitoring system for high-temperature and high-pressure water fatigue testing specimen scale distance section strain |
| CN103822573A (en) * | 2014-02-27 | 2014-05-28 | 东北大学 | Device and method for measuring size deformation of rock sample |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108931440A (en) * | 2017-05-27 | 2018-12-04 | 核工业西南物理研究院 | A kind of small sample is uniaxially stretched creep test fixture |
| CN107764649A (en) * | 2017-11-28 | 2018-03-06 | 郑州大学 | Tensile deformation test device and its deformation-sensor fixture in concrete sample high temperature |
| CN107764649B (en) * | 2017-11-28 | 2024-01-30 | 郑州大学 | Tensile deformation testing device for concrete test piece at high temperature and deformation sensor clamp thereof |
| CN109012495A (en) * | 2018-09-20 | 2018-12-18 | 西安力创材料检测技术有限公司 | The device of dynamic monitoring deformation index under a kind of high-temperature and high-pressure conditions in reaction kettle |
| CN109012495B (en) * | 2018-09-20 | 2024-03-15 | 西安力创材料检测技术有限公司 | Device for dynamically monitoring deformation index under high-temperature and high-pressure condition in reaction kettle |
| CN110553937A (en) * | 2019-09-18 | 2019-12-10 | 哈尔滨工业大学 | tensile-tensile fatigue testing device for fiber rod body and fatigue performance evaluation method |
| CN113369506A (en) * | 2021-05-21 | 2021-09-10 | 深圳市爱贝科精密工业股份有限公司 | Front end cooling type oil-gas lubrication electric spindle with displacement sensor |
| CN113369506B (en) * | 2021-05-21 | 2022-08-12 | 深圳市爱贝科精密工业股份有限公司 | Front end cooling type oil-gas lubrication electric spindle with displacement sensor |
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Application publication date: 20170510 |