CN206369528U - A kind of apparatus and system for measuring inside concrete displacement - Google Patents
A kind of apparatus and system for measuring inside concrete displacement Download PDFInfo
- Publication number
- CN206369528U CN206369528U CN201621408003.XU CN201621408003U CN206369528U CN 206369528 U CN206369528 U CN 206369528U CN 201621408003 U CN201621408003 U CN 201621408003U CN 206369528 U CN206369528 U CN 206369528U
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- foil gauge
- face
- housing
- inside concrete
- probe
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Abstract
The utility model provides a kind of apparatus and system for measuring inside concrete displacement, is related to inside concrete displacement measurement field.Measuring the device of inside concrete displacement includes housing, shell fragment, probe and sleeve pipe, the fixing end of shell fragment is connected with housing, there is gap between first face of shell fragment and housing and between the second face of shell fragment and housing, first face and the second face are provided with foil gauge, fixing end of the foil gauge close to shell fragment, housing position corresponding with free end is provided with the first through hole that internal diameter is more than sleeve pipe, and probe is connected with free end and housing is stretched out in one end of probe by first through hole, and sleeve pipe is movably set in probe.The good airproof performance of the device, and service life is long.Measuring the system of inside concrete displacement includes multiple said apparatus, and multiple said apparatus are connected by conduit, and the system can rapidly and continuously measure each displacement after concrete structure interior change, and precision is high.
Description
Technical field
The utility model is related to inside concrete displacement measurement field, and inside concrete is measured in particular to one kind
The apparatus and system of displacement.
Background technology
On high ferro non-fragment orbit, the relative displacement that track plates bottom positive stop lug boss can be produced with surrounding structure, therefore need
Continuous Observation is carried out to non-fragment orbit service state, provide measurement data for non-fragment orbit state estimation, nothing is improved with this
Tiny fragments of stone, coal, etc. railway maintenance maintenance efficiency.
At present, when measuring the displacement occurred inside concrete structure using displacement measuring device, after concrete coagulation, very
Hardly possible changes the device of other measurement inside concrete displacements, therefore it is required that the life-span of measurement apparatus will be grown, be hardly damaged.
Utility model content
First purpose of the present utility model is there is provided a kind of device for measuring inside concrete displacement, its sealing property
It is good, it is hardly damaged, service life is long.
Second purpose of the present utility model is that the system can be fast there is provided a kind of system for measuring inside concrete displacement
Each displacement after speed and continuously measurement concrete structure interior change, precision is high, is hardly damaged simultaneously, service life is long.
What the utility model was realized in：
A kind of device for measuring inside concrete displacement, including housing, shell fragment, probe and sleeve pipe, shell fragment are arranged on housing
Inside, and the opposite end of shell fragment is fixing end and free end, fixing end be connected with housing, shell fragment including the first relative face and
, there is gap in second face between the first face and housing and between the second face and housing, the first face and the second face are provided with foil gauge,
Foil gauge close to fixing end, housing position corresponding with free end be provided with internal diameter be more than sleeve pipe first through hole, probe with from
Housing is stretched out by first through hole by one end of end connection and probe, sleeve pipe is movably set in probe.
Further, in the utility model preferred embodiment, the length of sleeve pipe is less than the length of probe.
Further, in the utility model preferred embodiment, sleeve pipe activity is embedded at first through hole, and sleeve pipe is outer
Side wall is contacted with first through hole.
Further, in the utility model preferred embodiment, foil gauge includes the first foil gauge and the second foil gauge,
On the first face, the second foil gauge is set on the second surface first foil gauge, and the first foil gauge is parallel with the second foil gauge.
Further, in the utility model preferred embodiment, foil gauge also includes the 3rd foil gauge and the 4th strain
Piece, the 3rd foil gauge is set on the first face, and the 4th foil gauge is set on the second surface, and the first foil gauge and the 3rd foil gauge exist
Position of the position with the second foil gauge and the 4th foil gauge on the second surface on first face is identical.
Further, in the utility model preferred embodiment, housing offers second close to the end of fixing end and led to
Hole, the second through hole is connected with conduit.
Further, in the utility model preferred embodiment, conduit is " L " type.
Further, in the utility model preferred embodiment, shell is provided with the first screw hole, and shell fragment is provided with the second spiral shell
Nail, housing is connected with nut using screw with shell fragment through the first screw hole with the second screw hole；Second screw hole is close should
Become piece, and be arranged at intervals with foil gauge.
A kind of system for measuring inside concrete displacement, includes the device of multiple above-mentioned measurement inside concrete displacements, many
The device of individual measurement inside concrete displacement is connected by conduit.
Further, in the utility model preferred embodiment, measuring the system of inside concrete displacement also includes mould
Plate, template is abutted with probe.
The beneficial effects of the utility model are：The measurement inside concrete displacement that the utility model is obtained by above-mentioned design
Device, due to shell fragment the first face and the second face be provided with foil gauge, and probe and shell fragment free end connection, when probe with
During measurement structure displacement, shell fragment is set to bend, shell fragment two sides produces strain δ equal in magnitude, in opposite direction.Shift value and δ
It is linear, shift value can be measured by foil gauge and data processing detection means.Due to being used as survey using foil gauge
The main tool of amount, the test speed of the device is fast, measurement result is accurate.Secondly, housing position corresponding with free end is set
There is internal diameter to be more than the first through hole of sleeve pipe, probe is connected with free end and housing is stretched out in one end of probe by first through hole, set
Pipe is movably set in probe, therefore sleeve pipe can not only ensure the sealing of housing, prevents concrete from entering measurement concrete
In the device of internal displacement, probe is further protected, whole device is hardly damaged, service life extension.
The system for the measurement inside concrete displacement that the utility model is provided includes above-mentioned multiple measurement inside concrete positions
The device of shifting.The conduit connection and connection of the device of multiple measurement inside concrete displacements.Pass through multiple measurement inside concretes
The device of displacement detects multiple concrete structure internal displacements in the different distance in same horizontal line simultaneously, takes it to be averaged
Value, obtained result is more accurate.
Brief description of the drawings
, below will be to required in embodiment in order to illustrate more clearly of the technical scheme of the utility model embodiment
The accompanying drawing used is briefly described, it will be appreciated that the following drawings illustrate only some embodiments of the present utility model, therefore not
The restriction to scope is should be considered as, for those of ordinary skill in the art, on the premise of not paying creative work,
Other related accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of the device for the measurement inside concrete displacement that the utility model embodiment is provided；
Fig. 2 is first the regarding of removing after housing of device for the measurement inside concrete displacement that the utility model embodiment is provided
The schematic diagram at angle；
Fig. 3 is that the device for the measurement inside concrete displacement that the utility model embodiment is provided removes second after housing
The schematic diagram at visual angle；
Fig. 4 is the signal under the device use state for the measurement inside concrete displacement that the utility model embodiment is provided
Figure；
Fig. 5 is the schematic diagram of the system for the measurement inside concrete displacement that the utility model embodiment is provided.
Icon：100- measures the device of inside concrete displacement；110- housings；111- first ends；112- the second ends；
120- shell fragments；120a- fixing ends；120b- free ends；The faces of 121- first；The faces of 122- second；130- foil gauges；131- first should
Become piece；The foil gauges of 132- second；The foil gauges of 133- the 3rd；The foil gauges of 134- the 4th；150- wires；160- sleeve pipes；170- probes；
181- conduits；191- screws；192- nuts；The system that 200- measures inside concrete displacement；300- templates.
Embodiment
To make the purpose, technical scheme and advantage of the utility model embodiment clearer, below in conjunction with this practicality
Accompanying drawing in new embodiment, the technical scheme in the utility model embodiment is clearly and completely described, and shows
So, described embodiment is a part of embodiment of the utility model, rather than whole embodiments.Based on this practicality
Embodiment in new, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of the utility model protection.Therefore, implementation of the present utility model below to providing in the accompanying drawings
The detailed description of mode is not intended to limit claimed scope of the present utility model, but is merely representative of of the present utility model
Selected embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative labor
The every other embodiment obtained under the premise of dynamic, belongs to the scope of the utility model protection.
In description of the present utility model, it is to be understood that term " middle part ", " length ", " width ", " on ", " under "
Orientation or position relationship Deng instruction are, based on orientation shown in the drawings or position relationship, to be for only for ease of and describe this practicality newly
Type and simplified description, rather than instruction or the signified equipment of hint or element must be with specific orientation, with specific orientation
Construction and operation, therefore it is not intended that to limitation of the present utility model.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include one or more this feature.In description of the present utility model, " multiple " are meant that two or two
More than, unless otherwise specifically defined.
In the utility model, unless otherwise clearly defined and limited, the term such as term " connection ", " fixation " should be done extensively
Reason and good sense solution, for example, it may be fixedly connected or be detachably connected, or integrally；Can mechanically connect, can also
It is electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary, can be two element internals connection or
The interaction relationship of two elements.For the ordinary skill in the art, it can understand above-mentioned as the case may be
Concrete meaning of the term in the utility model.
In the utility model, unless otherwise clearly defined and limited, fisrt feature second feature it " on " or it
" under " can directly be contacted including the first and second features, it is not direct contact but logical that can also include the first and second features
The other characterisation contact crossed between them.Moreover, fisrt feature second feature " on ", " top " and " above " include the
One feature is directly over second feature and oblique upper, or is merely representative of fisrt feature level height higher than second feature.First is special
Levy second feature " under ", " lower section " and " below " include fisrt feature immediately below second feature and obliquely downward, or only
Represent that fisrt feature level height is less than second feature.
A kind of device 100 for measuring inside concrete displacement is present embodiments provided, as shown in figure 1, in measurement concrete
The device 100 of portion's displacement has housing 110.It should be noted that the shape of housing 110, size and material are not limited.In this implementation
In example, in order to adapt to concrete inner structure, housing 110 is cuboid, is made from stainless steel.Housing 110 includes relative
First end 111 and the second end 112.
Specifically, it is easy to describe in detail, Fig. 2-Fig. 5 removes after housing 110 for the device 100 of measurement inside concrete displacement
Structure, that is, measure inside concrete displacement device 100 internal structure.As shown in Fig. 2 measurement inside concrete displacement
Device 100 also includes shell fragment 120.The opposite end of bullet is fixing end 120a and free end 120b.Shell fragment 120 is arranged on housing
Inside 110, and the fixing end 120a of shell fragment 120 is connected with first end 111；Meanwhile, the free end 120b of shell fragment 120 is not with
Two ends 112 are contacted.Shell fragment 120 includes relative the first face 121 and the second face 122.Between first face 121 and housing 110 with
And second have gap between face 122 and housing 110.It is to be understood that the both sides of shell fragment 120 are not contacted with housing 110.
First face 121 and the second face 122 are provided with foil gauge 130.Foil gauge 130 is close to fixing end 120a, and and fixing end
120a is arranged at intervals.In the present embodiment, in order to increase measurement accuracy and convenient processing, foil gauge 130 is to be pasted onto shell fragment 120
On.Secondly, it is necessary to which explanation, the thickness of shell fragment 120 is as far as possible small, the precision for so measuring displacement relative will be improved,
In the present embodiment, it is preferable that the thickness of shell fragment 120 is 1mm.
Compared with the method for traditional measurement displacement, the main tool using foil gauge 130 as measurement has advantages below：
1st, sensitivity is high, and measuring speed is fast, and measurement result is accurate.2nd, be easily achieved fully automated data acquisition in test process, it is many
Point synchro measure, telemeasurement and remote control detection, are particularly suitable for use in the detection of concrete inner structure.3rd, foil gauge 130 is marked
It is convenient away from small, stickup.4th, light weight.5th, it is applied widely, can successfully it be measured under the specific conditions such as high temperature, low temperature, high pressure, high speed
Survey.6th, easy to operate, method of testing is easy to grasp.
Measuring the device 100 of inside concrete displacement also includes probe 170 and sleeve pipe 160, housing 110 and free end 120b
Corresponding position is provided with the first through hole (unmarked in figure) that internal diameter is more than sleeve pipe 160, and probe 170 is connected with free end 120b
And housing 110 is stretched out in one end of probe 170 by first through hole, sleeve pipe 160 is movably set in probe 170.It should be noted that
The internal diameter of first through hole is not limited, it is preferable that the activity of sleeve pipe 160 is embedded at first through hole, and the lateral wall of sleeve pipe 160 and first leads to
Hole is contacted, in other words, and internal diameter and the sleeve pipe 160 of first through hole are adapted, and sleeve pipe 160 is in contact with first through hole and can occurred
Relative displacement.
Specifically, in the present embodiment, one end of sleeve pipe 160 is close to the second face 122.Probe 170 passes through sleeve pipe 160, and
It is connected with the second face 122.In other words, sleeve pipe 160 can be slided relative to shell, and not influence the activity of probe 170.Set on shell
There is sleeve pipe 160, the sealing of shell can be ensured when pouring coagulation.It should be noted that in this embodiment, it is preferred that,
The hard material of the material selection light weight of sleeve pipe 160, sleeve pipe 160 does not influence probe 170 to occur normal displacement, makes the knot of measurement
Fruit is more accurate.Probe 170 can be further protected to be not damaged by secondly as there is sleeve pipe 160.
Measuring the operation principle of the device 100 of inside concrete displacement is：Because the first face 121 and the second face 122 are provided with
Foil gauge 130, when probe 170 is subjected to displacement with measurement structure, makes shell fragment 120 bend, and the two sides of shell fragment 120 produces big
Small equal, in opposite direction strain δ.Secondly, shift value is linear with δ, is filled by foil gauge 130 and data processing detection
Shift value can be measured by putting.
Further, in the present embodiment, the length of sleeve pipe 160 is less than the length of probe 170.It should be noted that
In other embodiment, the relative length of sleeve pipe 160 and probe 170 is not limited.
Fig. 2 and Fig. 3 are referred to, in the present embodiment, foil gauge 130 includes the first foil gauge 131 and the second foil gauge
132, the first foil gauge 131 is arranged on the first face 121, and the second foil gauge 132 is arranged on the second face 122.Wherein, first answer
Change piece 131 is parallel with the second foil gauge 132, and the 3rd foil gauge 133 is parallel with the 4th foil gauge 134.Further, in order to increase
The precision of measurement, in addition to the 3rd foil gauge 133 and the 4th foil gauge 134, the 3rd foil gauge 133 are arranged on the first face 121,
4th foil gauge 134 is arranged on the second face 122.First foil gauge 131, the second foil gauge 132, the 3rd foil gauge 133 and
Four foil gauges 134 are connected by wire 150, using " full-bridge connection ".Again, preferably but this is not limited to, the first foil gauge
131 and the 3rd position of the foil gauge 133 on the first face 121 with the second foil gauge 132 and the 4th foil gauge 134 in the second face
Position on 122 is identical.It should be noted that foil gauge 130 can also use strain rosette, its angle bonded can use 0 °, 45 °
Or 90 ° etc..
Referring again to Fig. 1 and Fig. 2, it is easy to arrange wire 150 and does not influence measurement accuracy, housing 110 is close to fixing end
120a end offers the second through hole (unmarked in figure), and the second through hole is connected with conduit 181.Preferably, conduit 181 is at this
In embodiment, conduit 181 is " L " type, using pvc pipe.Plane where the mouth of pipe of conduit 181 and putting down where the first face 121
Face is vertical.Further, the mouth of pipe direction of conduit 181 is conveniently adjusted, conduit 181 can rotate relative to housing 110.That is conduit
The position of 181 mouth of pipe direction is not limited.The mouth of pipe direction of conduit 181 can be adjusted according to the direction of actual measurement.
As depicted in figs. 1 and 2, shell is provided with the first screw hole (not shown), and (figure is not provided with the second screw hole for shell fragment 120
Show), the position of the first screw hole is corresponding with the position of the second screw hole.I.e. housing 110 can utilize screw 191 with shell fragment 120
It is connected with nut 192 through the first screw hole with the second screw hole.Housing 110 passes through screw 191 and nut 192 with shell fragment 120
Connection can further increase stability between the two.
For the free end 120b activities of without prejudice to shell fragment 120, the first screw hole and the second screw hole are close to foil gauge
130, it is arranged at intervals with foil gauge 130, i.e., do not contacted with foil gauge 130.It should be noted that the first screw hole and the second spiral shell
The quantity of nail is not limited.In the present embodiment, in order to increase the stability between housing 110 and shell fragment 120, the first screw hole with
The quantity of second screw hole is all 2.Secondly, it will also be answered using screw 191 and nut 192 with the first foil gauge 131, second
The wire 150 for becoming piece 132, the 3rd foil gauge 133 and the connection of the 4th foil gauge 134 is compressed, and is prevented wire 150 from coming off and is influenceed to survey
Measure the stability of the device 100 of inside concrete displacement.
Referring to Fig. 5, the present embodiment additionally provides a kind of system 200 for measuring inside concrete displacement.Measure concrete
The system 200 of internal displacement includes the device 100 of above-mentioned multiple measurement inside concrete displacements.Multiple measurement inside concrete positions
The conduit 181 of the device 100 of shifting is connected and connected.Detected simultaneously by the device 100 of multiple measurement inside concrete displacements
In same horizontal line, multiple concrete structure internal displacements of different distance take its average value, obtained result is more accurate.
With reference to shown in Fig. 1, Fig. 2 and Fig. 4, a kind of installation method of system 200 for measuring inside concrete displacement and measurement
Step is：
Groove is opened up in the first step, concrete to place the device 100 of measurement inside concrete displacement, places measurement mixed
After the device 100 of solidifying soil internal displacement, conduit 181 is extended to outside concrete, to draw the wire 150 inside housing 110.
Second step, protects probe 170, exposes outer end and part tubular 160 of the probe 170 away from shell fragment 120, in shell
The outside of body 110 can leading casting concrete, to fix the device 100 of measurement inside concrete displacement.
3rd step, places template 300, and fixed with the outer end of probe 170 in one end of the remote shell fragment 120 of probe 170
Template 300, template 300 can select cystosepiment, rubber blanket, plank etc..It is worth noting that, in order to measure bidirectional displacement, first
Need to make template 300 withstand probe 170, i.e., towards the moving die plate 300 of housing 110, probe 170 is had certain precompressed amount, and make
The generation elastic deformation of shell fragment 120, while adjusting sleeve pipe 160, makes its contact template 300, probe 170 and extraneous no gap, i.e.,
It ensure that the sealing of housing 110.
It should be noted that the principle of measurement bidirectional displacement is：Because probe 170 has certain precompressed amount, namely shell fragment
120 there occurs deformation (position as shown in Figure 4), when both sides concrete away from when, the probe 170 for having certain precompressed amount can be outside
Motion；When both sides concrete is close, probe 170 can be moved internally, therefore can measure bidirectional displacement.
4th step, in side casting concrete of the template 300 away from housing 110, completes to install.
5th step, debugs each equipment, you can continuous collecting inside concrete displacement.It is worth noting that, in debugging process
In, it is necessary first to the relation between calibration strain piece 130 and shell fragment 120, make both into the linear relationship of a determination.
To sum up, the device 100 for the measurement inside concrete displacement that the utility model is provided, can be in continuous collecting concrete
Portion's displacement, at the same measure inside concrete displacement the test speed of device 100 is fast, measurement result accurate, service life length and not
It is fragile.Secondly as sleeve pipe 160 is actively embedded on shell, probe 170 passes through sleeve pipe 160.Therefore sleeve pipe 160 can
Ensure the sealing of shell, prevent concrete from entering in the device 100 of measurement inside concrete displacement, and sleeve pipe 160 can
Prevent that originally the stress of probe 170 is excessive, occur bending or damaged by other, further enable the normal work of probe 170, make
The working time of the device 100 of whole measurement inside concrete displacement is elongated.
Measurement inside concrete displacement system 200 can detect simultaneously in same horizontal line different distance it is many
Individual concrete structure internal displacement, takes its average value, and obtained result is more accurate.
Preferred embodiment of the present utility model is the foregoing is only, the utility model is not limited to, for
For those skilled in the art, the utility model can have various modifications and variations.It is all in spirit of the present utility model and former
Within then, any modification, equivalent substitution and improvements made etc. should be included within protection domain of the present utility model.
Claims (10)
1. a kind of device for measuring inside concrete displacement, it is characterised in that including housing, shell fragment, probe and sleeve pipe, the bullet
Piece is arranged on the enclosure interior, and the opposite end of the shell fragment is fixing end and free end, the fixing end and the shell
Body is connected, and the shell fragment includes the first relative face and the second face, between first face and the housing and described second
There is gap between face and the housing, first face and second face are provided with foil gauge, and the foil gauge is close to described
Fixing end, housing position corresponding with the free end is provided with the first through hole that internal diameter is more than described sleeve pipe, the spy
Pin is connected with the free end and the housing, described sleeve pipe movable sleeve are stretched out in one end of the probe by the first through hole
Located at the probe.
2. a kind of device for measuring inside concrete displacement according to claim 1, it is characterised in that the length of described sleeve pipe
Length of the degree less than the probe.
3. a kind of device for measuring inside concrete displacement according to claim 1, it is characterised in that described sleeve pipe activity
The first through hole is embedded at, and the lateral wall of described sleeve pipe is contacted with the first through hole.
4. a kind of device for measuring inside concrete displacement according to claim 1, it is characterised in that the foil gauge bag
The first foil gauge and the second foil gauge are included, first foil gauge is on first face, and second foil gauge is arranged on institute
State on the second face, and first foil gauge is parallel with second foil gauge.
5. a kind of device for measuring inside concrete displacement according to claim 4, it is characterised in that the foil gauge is also
Including the 3rd foil gauge and the 4th foil gauge, the 3rd foil gauge is arranged on first face, and the 4th foil gauge is set
Put on second face, the position and described second of first foil gauge and the 3rd foil gauge on first face
Position of the foil gauge with the 4th foil gauge on second face is identical.
6. a kind of device for measuring inside concrete displacement according to claim 1, it is characterised in that the housing is close
The end of the fixing end offers the second through hole, and second through hole is connected with conduit.
7. a kind of device for measuring inside concrete displacement according to claim 6, it is characterised in that the conduit is
" L " type.
8. a kind of device for measuring inside concrete displacement according to claim 1, it is characterised in that the housing is provided with
First screw hole, the shell fragment is provided with the second screw hole, and the housing and the shell fragment are using screw and nut through described the
One screw hole is connected with second screw hole；Second screw hole close to the foil gauge, and with the foil gauge interval
Set.
9. a kind of system for measuring inside concrete displacement, it is characterised in that including the measurement coagulation described in multiple claims 6
The device of native internal displacement, the device of multiple measurement inside concrete displacements is connected by the conduit.
10. the system of measurement inside concrete displacement according to claim 9, it is characterised in that the measurement concrete
The system of internal displacement also includes template, and the template is abutted with the probe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621408003.XU CN206369528U (en) | 2016-12-21 | 2016-12-21 | A kind of apparatus and system for measuring inside concrete displacement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621408003.XU CN206369528U (en) | 2016-12-21 | 2016-12-21 | A kind of apparatus and system for measuring inside concrete displacement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206369528U true CN206369528U (en) | 2017-08-01 |
Family
ID=59393046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621408003.XU Expired - Fee Related CN206369528U (en) | 2016-12-21 | 2016-12-21 | A kind of apparatus and system for measuring inside concrete displacement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206369528U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108613620A (en) * | 2018-04-18 | 2018-10-02 | 西安交通大学 | A kind of tangent displacement sensor structure and preparation method thereof based on 3D printing |
-
2016
- 2016-12-21 CN CN201621408003.XU patent/CN206369528U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108613620A (en) * | 2018-04-18 | 2018-10-02 | 西安交通大学 | A kind of tangent displacement sensor structure and preparation method thereof based on 3D printing |
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Granted publication date: 20170801 Termination date: 20181221 |