CN207231920U - Crackle aperture displacement measuring device - Google Patents
Crackle aperture displacement measuring device Download PDFInfo
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- CN207231920U CN207231920U CN201721035115.XU CN201721035115U CN207231920U CN 207231920 U CN207231920 U CN 207231920U CN 201721035115 U CN201721035115 U CN 201721035115U CN 207231920 U CN207231920 U CN 207231920U
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Abstract
The utility model discloses a kind of crackle aperture displacement measuring device, including for holding closed container, heating unit, the first fixing piece and the second fixing piece for fixing sample, first connecting rod component and second connecting rod component, the first displacement sensor and the second displacement sensor of high temperature corrosion conducting medium；First fixing piece and the second fixing piece are oppositely arranged in closed container；First displacement sensor and second displacement sensor are arranged on closed container, and first connecting rod component and second connecting rod component are connected on the thickness x cross sectional of sample between sample and the first displacement sensor and between sample and second displacement sensor.The utility model can accurately measure the crackle aperture displacement for the compact tensile specimen being immersed in high temperature corrosion conducting medium, be that elastic-plastic fracture toughness and fatigue crack growth rate of the test high temperature corrosion conductive liquid medium cooled reactor structural material in this complexity particular surroundings provide accurate measurement means.
Description
Technical field
It the utility model is related to a kind of measuring device, more particularly to a kind of crackle aperture displacement measuring device.
Background technology
High temperature corrosion conducting medium (such as high-temperature high pressure water, liquid lead, lead bismuth eutectic alloy, sodium and otheralkali metal) is first
The cooling agent important into nuclear power system.The compatibility of cooling agent and material is the important finger of evaluation core security of system energy
Mark.Such as liquid metal (the pure lead of such as liquid or lead bismuth alloy) cooling fast reactor can realize Nuclear fuel breeding, reduce nuke rubbish and
Nuclear fuel effective rate of utilization is improved, is one of current most promising forth generation nuclear reactor art universally recognized in the world.
The security of novel reaction heap is heavily dependent on whether structural material can bear the long-term of extreme environment
Examination, including the corrosion and embrittlement of high temperature fluent metal cooling agent to material etc..Wherein, Liquid Metal Embrittlement is a kind of important
Material property degradation phenomenon, its main feature is that under plus load effect, after material surface crackle is soaked by liquid metal, Crack Tip
Hold atom bond with joint efforts or crystal boundary bond strength is weakened, so as to cause the macroscopically decline of material fracture toughness and crack propagation
The acceleration of speed.Liquid Metal Embrittlement can cause material that the moment fracture failure without omen occurs.Therefore, accurate evaluation material exists
Mechanical property in liquid metal environment is the suitable heap structural material of selection and the necessary process for ensuring reactor safety.
Fracture toughness or fatigue crack growth rate are one of parameters mostly important in mechanical performance index, this is because
Fracture toughness determines the intrinsic ability of material resistance crack propagation, by nuclear structural materials fracture toughness during military service
Degeneration is timed monitoring, and the service life of nuclear structure part can be predicted.Cyclic loading is most important in nuclear reactor
One of load type, under the effect of this load, the micro-crack in nuclear structural materials can extend, so as to reduce structural member pair
The ability to bear of external applied load.By measure fatigue crack growth rate can predict crackle reach needed for safety critical length when
Between, this is also one of important reference for predicting nuclear structure part service life.The safety of novel liquid metal cooled reactor
Design be unable to do without the accurate evaluation to nuclear structural materials performance, and advanced measurement means are to realize the important prerequisite of this target.
The test of elastic-plastic fracture toughness and fatigue crack growth rate all refers to the accurate measurement of crack length, measurement side
Method depends on the media environment residing for sample.For high temperature corrosion conducting medium (such as high-temperature high pressure water, liquid lead, lead bismuth eutectic
Alloy, sodium and otheralkali metal) cooled reactor, its medium is with high temperature, the spy that burn into is conductive and (liquid metal) is opaque
Property, which dictates that there are significant limitations for the traditional measurement method of crack length.
Traditional crack length measuring method mainly includes light microscope direct observational method, voltage method and flexibility method etc..
Light microscope direct observational method is that crack length is directly observed and measured using light microscope, Ci Zhongfang
Method is not suitable for nontransparent liquid metal medium suitable for the measurement of the crack length air dielectric.
The basic principle of voltage method is the extension with crackle, and the increase of crack length can cause the resistance of sample to become
Change, so as to cause the response of voltage signal, crack length is estimated by the change for measuring the voltage signal.The method will
Ask the medium residing for sample that there is visibly different resistance, so when crack propagation, voltage signal in itself with sample material
Change could be reflected delicately.So the method is usually used in crack length in the media such as air or high-temperature high pressure water
Measurement because the resistance of these media is totally different from the resistance of sample material in itself.For liquid metal conducting medium, by
In its resistance, the resistance of itself is sufficiently close to sample material (such as stainless steel), therefore the change of voltage signal is to crack length
Change insensitive so that this method cannot accurately be measured in liquid metal medium environment.
Flexibility method is by measuring the crackle aperture displacement corresponding to compact tension specimen (CT) sample loaded line, then utilizing
Formula in ASTM E1820 standards calculates the crack length in sample.Therefore, how the crackle accurately measured at loaded line is opened
Mouth displacement is that the key point of crack length is accurately measured using flexibility method.For air dielectric, generally strain gauge is clamped in
The sample aperture position overlapped with loaded line, so can relatively accurately measure crackle aperture displacement.But strain gauge is in conduction
Short circuit occurs in medium, while high temperature can not be born, therefore the cisco unity malfunction in high temperature corrosion conducting medium.
Utility model content
The technical problems to be solved in the utility model is, there is provided one kind can be accurate in a variety of high temperature corrosion conducting mediums
Measure the crackle aperture displacement measuring device of crackle aperture displacement.
Technical solution is used by the utility model solves its technical problem：A kind of crackle aperture displacement measurement dress is provided
Put, including the closed container for holding high temperature corrosion conducting medium, the heating unit heated to the closed container, use
In the first fixing piece of fixed sample and the second fixing piece, the first connecting rod component by crackle aperture displacement extraction on the sample
The first displacement sensor and second displacement sensor measured with second connecting rod component, to the crackle opening of extraction；
First fixing piece and the second fixing piece are oppositely arranged in the closed container, and the fixed sample is located at
The both ends of crackle both sides；First displacement sensor and second displacement sensor are arranged on the closed container, and described
One link assembly and second connecting rod component are connected to the sample and the first displacement sensor on the thickness x cross sectional of sample
Between and the sample and second displacement sensor between.
Preferably, the first connecting rod component includes the first cross bar and the first straight-bar；The first end of first cross bar connects
The sample is connect, second end is equipped with open the first arc groove upward；It is spherical that the first end of first straight-bar is equipped with first
Body, first orbicule coordinate in first arc groove, described first of the second end connection of first straight-bar
Displacement sensor.
Preferably, the second connecting rod component includes the second cross bar and the second straight-bar；The first end of second cross bar connects
The sample is connect, second end is equipped with open the second arc groove upward；It is spherical that the first end of second straight-bar is equipped with second
Body, second orbicule coordinate in second arc groove, and the second end of second straight-bar connects the second
Displacement sensor.
Preferably, pin hole, the both ends difference of the sample are respectively equipped with first fixing piece and the second fixing piece
It is connected to by latch and the pin hole clearance fit on first fixing piece and the second fixing piece；
The center of circle of first arc groove is overlapped with the corresponding latch centerline hole；Second arc groove
The center of circle is overlapped with the center line of the corresponding pin hole.
Preferably, the crackle aperture displacement measuring device further includes load bar, and the load bar is arranged on described closed
The top of container；First fixing piece connects the load bar, and relatively described first fixing piece of second fixing piece is set
In the interior bottom of the closed container.
Preferably, the center of first orbicule, the first arc groove the center of circle in the horizontal direction with it is corresponding described
The center line of pin hole overlaps, in vertical direction and the center overlapping of axles of the load bar；
The center of second orbicule, the center of circle of the second arc groove in the horizontal direction with the corresponding pin hole
Center line overlaps, in vertical direction and the center overlapping of axles of the load bar.
Preferably, the length of first cross bar and the second cross bar is different.
Preferably, the crackle aperture displacement measuring device further includes the first spring assembly and second spring component, described
First spring assembly includes the first spring part being arranged in the first straight-bar second end and is arranged on first spring
The first sleeve outside part, first spring part are connected with first displacement sensor；
The second spring component includes the second spring part being arranged in the second straight-bar second end and is arranged on
Second sleeve outside the second spring part, the second spring part are connected with the second displacement sensor.
Preferably, the crackle aperture displacement measuring device further includes the cooler bin being arranged at the top of the closed container；
First displacement sensor and second displacement sensor are arranged in the cooler bin.
Preferably, the heating unit includes coil, is arranged on the periphery of the closed container.
Preferably, the closed container includes open-topped vessel, retractable cover is opened in the vessel
Head cover on mouth；
First fixing piece is arranged on the head cover, and second fixing piece is arranged on the interior bottom of the vessel
Portion.
The beneficial effects of the utility model：The crackle aperture displacement of CT samples is drawn, then is carried out by displacement sensor
Measurement, circuit part must be fully immersed in high temperature corrosion conduction by avoiding when being measured using other measuring methods such as strain gauge
The shortcomings that there is short circuit in medium and can not working normally.Can accurately measure be immersed in it is compact in high temperature corrosion conducting medium
The crackle aperture displacement of tensile sample (CT) is test high temperature corrosion conductive liquid medium cooled reactor structural material this
Elastic-plastic fracture toughness and fatigue crack growth rate in complicated particular surroundings provide accurate measurement means.
The device can be up to 800 DEG C, opaque, conductive liquid metal corrosion medium and other complicated special Jie in temperature
Work in matter.Simple in structure, easy to operate, of low cost, applied widely, flexibility is high.
Brief description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is the structure diagram of the crackle aperture displacement measuring device of one embodiment of the utility model；
Fig. 2 is structure diagram of the measuring device of crackle aperture displacement shown in Fig. 1 in A angles；
Fig. 3 is the enlarged structure schematic diagram of part B in Fig. 2.
Embodiment
For a clearer understanding of the technical features, objectives and effects of the utility model, it is detailed now to compare attached drawing
Illustrate specific embodiment of the present utility model.
As shown in Figure 1, 2, the crackle aperture displacement measuring device of one embodiment of the utility model, including for holding high temperature
The closed container 10 of etching conductive medium, the heating unit 20 heated to closed container 10, for fix sample 1 first
31 and second fixing piece 32 of fixing piece, the first connecting rod component 40 that crackle aperture displacement on sample 1 is drawn and second connecting rod group
The first displacement sensor 61 and second displacement sensor 62 that part 50, the crackle opening to extraction measure.
Wherein, the first fixing piece 31 and the second fixing piece 32 are oppositely arranged in closed container 10, and fixed sample 1 is located at
The both ends of crackle both sides so that the crackle on sample 1 is between the first fixing piece 31 and the second fixing piece 32.First displacement passes
Sensor 61 and second displacement sensor 62 are arranged on closed container 10, and first connecting rod component 40 and second connecting rod component 50 are trying
It is connected on the thickness x cross sectional of sample 1 between 1 and first displacement sensor 61 of sample and sample 1 and second displacement sensor
Between 62.
Specifically, closed container 10 can hold a variety of different high-temperature electric conduction corrosive mediums, and sample 1 is soaked wherein；
Closed container 10 is made of the stainless steel material of high-temperature corrosion resistance.The closed container 10 includes open-topped vessel
11st, the retractable head cover 12 covered in the opening of vessel 11；Closed container 10 is opened and closed setting easy to high-temperature electric conduction corruption
The dismounting of erosion the picking and placeing of medium, sample 1 and miscellaneous part etc..
Heating unit 20 is arranged on closed container 10, and closed container 10 and its interior high-temperature electric conduction corrosive medium are carried out
Heating, reaches measurement temperature.
Heating unit 20 may include coil, be arranged on the periphery of closed container 10, can be to closed container 10 and its interior
While high-temperature electric conduction corrosive medium is heated, it is not required to be immersed in high-temperature electric conduction corrosive medium, avoids being corroded and not
Space in closed container 10 need to be taken.
First fixing piece 31 is arranged on the head cover 12 of closed container 10, and head cover 12 forms the top of closed container 10；The
Two fixing pieces 32 are arranged on the interior bottom of vessel 11, both are oppositely arranged up and down, and sample 1 is carried out to be vertically connected with fixation.
The crackle aperture displacement measuring device of the utility model further includes load bar 70, and load bar 70 is arranged on closed container
10 top.First fixing piece 31 connects load bar 70, realizes the transmission (F in such as Fig. 1,2) of power.The upper end of load bar 70 is into one
Step connection load driver.
Second fixing piece, 32 opposite first fixing piece 31 is arranged on the interior bottom of closed container 10.Second fixing piece 32 can be straight
The interior bottom for being fixed on container bottom 10 is connect, can be also supported on by base on 10 bottom of closed container.First fixing piece, 31 He
Second fixing piece 32 can be the shape of a hoof.
Be respectively equipped with pin hole on first fixing piece 31 and the second fixing piece 32, the both ends of sample 1 respectively by latch 34,
35 are connected on the first fixing piece 31 and the second fixing piece 32 with pin hole clearance fit.Wherein, latch 34,35 and pin hole
Clearance fit, enables latch 34,35 to be rotated in pin hole, in crack propagation, does not influence the rotation of sample 1.
As shown in Figs. 1-3, first connecting rod component 40 includes the first cross bar 41 and the first straight-bar 42.First cross bar is in closed appearance
Device 10 is in horizontally disposed and parallel with sample 1；The first end connection sample 1 of first cross bar 41, second end be equipped with it is open upward
First arc groove 43, the center of circle of the first arc groove 43 are overlapped with corresponding latch centerline hole.First straight-bar 42 is closed
Container 10 is vertical setting, and parallel with sample 1；The first end of first straight-bar 42 is equipped with the first orbicule 44, second end connection
First displacement sensor 61.First orbicule 44 coordinates in the first arc groove 43, both can relatively rotate.First orbicule
44 surfaces are smooth so that the first orbicule 44 and the first arc groove 43 will not produce locked and lateral when relatively rotating
The problem of slip.
Second connecting rod component 50 includes the second cross bar 51 and the second straight-bar 52.Second cross bar 51 is in closed container 10 in level
Set, and it is parallel with sample 1；The first end connection sample 1 of second cross bar 51, it is recessed that second end is equipped with open the second arc upward
Groove 53, the center of circle of the second arc groove 53 are overlapped with the center line of corresponding pin hole.Second straight-bar 52 is in closed container 10
It is vertically arranged, and it is parallel with sample 1；The first end of second straight-bar 52 is equipped with the second orbicule (not shown), second end connection the
Two displacement sensors 62.Second orbicule coordinates (refers to 44 He of the first orbicule shown in Fig. 3 in the second arc groove 53
The cooperation of first arc groove 43), both can relatively rotate.Second vesicle surface is smooth so that the second orbicule and second
Arc groove 53 will not produce the problem of locked and lateral sliding when relatively rotating.
First straight-bar 42, the second straight-bar 52 are rigid rod.
In addition, the center of the first orbicule 44, the first arc groove 43 the center of circle in the horizontal direction with corresponding pin hole
Center line overlap, in the center overlapping of axles of vertical direction and load bar 70.The center of second orbicule, the second arc groove 53
The center of circle overlapped in the horizontal direction with the center line of corresponding pin hole, in vertical direction and the center overlapping of axles of load bar 70.
As shown in Figure 2, in the present embodiment, corresponding to the first displacement sensor 61 and second sensor 62 in closed container
10 tops are arranged side by side, and the first cross bar 41 is different with the length of the second cross bar 51, avoids both from colliding.Due to the first cross bar 41
Upper and lower position is in closed container 10 with the second cross bar 51, the first straight-bar 42 and 52 length of the second straight-bar are also different, to divide
The first displacement sensor 61 and second displacement sensor 62 are not connected, i.e.,：First straight-bar, 41 length is less than 52 length of the second straight-bar.
Further, the crackle aperture displacement measuring device of the utility model further includes the first spring assembly and second spring
Component.
As shown in Fig. 2, the first spring assembly include being arranged on the first spring part 81 in 42 second end of the first straight-bar and
The first sleeve 82 being arranged on outside the first spring part 81, the first spring part 81 are connected with the first displacement sensor 61.First spring
Setting of the part 81 on the first straight-bar 42, applies elastic force vertically downward to the first straight-bar 42, makes itself and the first arc groove 43
Inner surface remains certain contact force, and such first straight-bar 42 can react rapidly when transmitting crackle aperture displacement downward or upward
Without hysteresis occurs.First spring part 81 is placed among the first sleeve 82, its outside diameter is consistent with 82 internal diameter of the first sleeve, its
Purpose is to cause measurement mistake without excessive sideways movement occurs to make the first straight-bar 42 be only capable of up and down motion transmission vertical displacement
Difference.
Second spring component includes the second spring part 91 that is arranged in 52 second end of the second straight-bar and is arranged on second
Second sleeve 92 outside spring part 91, second spring part 91 are connected with second displacement sensor 62.Second spring part 91 is second
Setting on straight-bar 52, applies elastic force vertically downward to the second straight-bar 52, make its with 53 inner surface of the second arc groove all the time
Certain contact force is kept, such second straight-bar 52 can react stagnant without occurring rapidly when transmitting crackle aperture displacement downward or upward
Phenomenon afterwards.Second spring part 91 is placed among second sleeve 92, its outside diameter is consistent with 92 internal diameter of second sleeve, its purpose is to
The second straight-bar 52 is only capable of up and down motion transmission vertical displacement causes measurement error without excessive sideways movement occurs.
In addition, the crackle aperture displacement measuring device of the utility model, which may also include, is arranged on the cold of the top of closed container 10
But case 100.First displacement sensor 61 and second displacement sensor 62 are arranged in cooler bin 100, are cooled down by cooler bin 100
To keep normal working temperature.The conducting wire of first displacement sensor 61 and second displacement sensor 62 is pierced by cooler bin 100.
Alternatively, cooler bin 100 can be water cooling box, and the first displacement sensor is taken away by the input and discharge of cooling water
61 and the heat of second displacement sensor 62.
During utility model works, sample 1 is installed in closed container 10 by shown in Fig. 1,2；Pass through heating unit 20
High-temperature electric conduction corrosive medium in closed container 10 is heated to measurement temperature.When crackle extension in sample 1, more than crackle
Sample parts rotated counterclockwise around latch, while the sample parts below crackle are rotated clockwise around latch, the first arc
First orbicule 44 of the connected in star 43 around 42 lower end of the first straight-bar occurs accordingly to rotate, and the second arc groove 53 is straight around second
Corresponding rotation occurs for the second orbicule of 52 lower end of bar, and aperture displacement of such sample 1 at loaded line can be drawn to the
One displacement sensor 61 and second sensor 62, realize accurate measurement, so as to accurately estimate crack length.
By measurement, measured value and synthermal lower utilization high temperature strain gauge that the utility model obtains measure in atmosphere
Crackle aperture displacement compares, both are differed within 5%.
The above description is only the embodiments of the present invention, and it does not limit the scope of the patent of the present invention, every
Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is directly or indirectly used in
Other related technical areas, are equally included in the patent within the scope of the utility model.
Claims (10)
1. a kind of crackle aperture displacement measuring device, it is characterised in that including for holding the closed of high temperature corrosion conducting medium
Container (10), the heating unit (20) heated to the closed container (10), the first fixing piece for fixing sample (1)
(31) and the second fixing piece (32), by the sample (1) crackle aperture displacement draw first connecting rod component (40) and second
The first displacement sensor (61) and second displacement sensor that link assembly (50), the crackle opening to extraction measure
(62)；
First fixing piece (31) and the second fixing piece (32) are oppositely arranged in the closed container (10), the fixed examination
Sample (1) positioned at the both ends of crackle both sides；First displacement sensor (61) and second displacement sensor (62) are arranged on institute
State on closed container (10), the first connecting rod component (40) and second connecting rod component (50) are on the thickness x cross sectional of sample (1)
It is connected between the sample (1) and the first displacement sensor (61) and the sample (1) and second displacement sensor
(62) between.
2. crackle aperture displacement measuring device according to claim 1, it is characterised in that the first connecting rod component (40)
Including the first cross bar (41) and the first straight-bar (42)；The first end of first cross bar (41) connects the sample (1), second end
Equipped with open the first arc groove (43) upward；The first end of first straight-bar (42) is equipped with the first orbicule (44), institute
State the first orbicule (44) to coordinate in first arc groove (43), described in the second end connection of first straight-bar (42)
First displacement sensor (61)；
The second connecting rod component (50) includes the second cross bar (51) and the second straight-bar (52)；The first of second cross bar (51)
End connects the sample (1), and second end is equipped with open the second arc groove (53) upward；The first of second straight-bar (52)
End is equipped with the second orbicule, and second orbicule coordinates in second arc groove (53), second straight-bar (52)
Second end connect the second displacement sensor (62).
3. crackle aperture displacement measuring device according to claim 2, it is characterised in that first fixing piece (31) and
Pin hole is respectively equipped with second fixing piece (32), the both ends of the sample (1) pass through latch (34,35) and the latch respectively
Interporal lacuna is connected on first fixing piece (31) and the second fixing piece (32)；
The center of circle of first arc groove (43) is overlapped with the corresponding latch centerline hole；Second arc groove
(53) the center of circle is overlapped with the center line of the corresponding pin hole.
4. crackle aperture displacement measuring device according to claim 3, it is characterised in that the crackle aperture displacement measurement
Device further includes load bar (70), and the load bar (70) is arranged on the top of the closed container (10)；Described first fixes
Part (31) connects the load bar (70), and relatively described first fixing piece (31) of second fixing piece (32) is arranged on described close
Close the interior bottom of container (10).
5. crackle aperture displacement measuring device according to claim 4, it is characterised in that first orbicule (44)
Center, the center of circle of the first arc groove (43) are overlapped with the center line of the corresponding pin hole in the horizontal direction, in Vertical Square
To the center overlapping of axles with the load bar (70)；
The center of second orbicule, the center of circle of the second arc groove (53) in the horizontal direction with the corresponding pin hole
Center line overlaps, in vertical direction and the center overlapping of axles of the load bar (70).
6. crackle aperture displacement measuring device according to claim 2, it is characterised in that first cross bar (41) and
The length of two cross bars (51) is different.
7. crackle aperture displacement measuring device according to claim 2, it is characterised in that the crackle aperture displacement measurement
Device further includes the first spring assembly and second spring component, and first spring assembly includes being arranged on first straight-bar
(42) the first spring part (81) in second end and the first sleeve (82) of first spring part (81) outside, institute are arranged on
The first spring part (81) is stated to be connected with first displacement sensor (61)；
The second spring component include being arranged on second spring part (91) in the second straight-bar (52) second end and
The second sleeve (92) of the second spring part (91) outside is arranged on, the second spring part (91) senses with the second displacement
Device (62) connects.
8. crackle aperture displacement measuring device according to claim 7, it is characterised in that the crackle aperture displacement measurement
Device further includes the cooler bin (100) being arranged at the top of the closed container (10)；First displacement sensor (61) and
Two displacement sensors (62) are arranged in the cooler bin (100).
9. according to claim 1-8 any one of them crackle aperture displacement measuring devices, it is characterised in that the heating unit
(20) include coil, be arranged on the periphery of the closed container (10).
10. according to claim 1-8 any one of them crackle aperture displacement measuring devices, it is characterised in that the closed appearance
Device (10) includes open-topped vessel (11), the retractable head cover covered in the vessel (11) opening
(12)；
First fixing piece (31) is arranged on the head cover (12), and second fixing piece (32) is arranged on the container sheet
The interior bottom of body (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721035115.XU CN207231920U (en) | 2017-08-17 | 2017-08-17 | Crackle aperture displacement measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721035115.XU CN207231920U (en) | 2017-08-17 | 2017-08-17 | Crackle aperture displacement measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN207231920U true CN207231920U (en) | 2018-04-13 |
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ID=61858347
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|---|---|---|---|
| CN201721035115.XU Active CN207231920U (en) | 2017-08-17 | 2017-08-17 | Crackle aperture displacement measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107449676A (en) * | 2017-08-17 | 2017-12-08 | 中广核研究院有限公司 | Crackle aperture displacement measurement apparatus |
| CN108827122A (en) * | 2018-04-27 | 2018-11-16 | 中测测试科技（杭州）有限公司 | A kind of arm for adjusting automobile brake clearance automatically free clearance test device and method |
-
2017
- 2017-08-17 CN CN201721035115.XU patent/CN207231920U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107449676A (en) * | 2017-08-17 | 2017-12-08 | 中广核研究院有限公司 | Crackle aperture displacement measurement apparatus |
| CN107449676B (en) * | 2017-08-17 | 2024-03-22 | 中广核研究院有限公司 | Crack opening displacement measuring device |
| CN108827122A (en) * | 2018-04-27 | 2018-11-16 | 中测测试科技（杭州）有限公司 | A kind of arm for adjusting automobile brake clearance automatically free clearance test device and method |
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