CN208420238U - A kind of FBG monitoring device of bolt stress - Google Patents
A kind of FBG monitoring device of bolt stress Download PDFInfo
- Publication number
- CN208420238U CN208420238U CN201821340697.7U CN201821340697U CN208420238U CN 208420238 U CN208420238 U CN 208420238U CN 201821340697 U CN201821340697 U CN 201821340697U CN 208420238 U CN208420238 U CN 208420238U
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- China
- Prior art keywords
- fiber grating
- bolt
- micro groove
- optical fiber
- fiber
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a kind of FBG monitoring devices of bolt stress, including bolt, the first fiber grating and the second fiber grating；The bolt includes six square nuts, cylindrical portion, threaded portion, the surface of the cylindrical portion is axially arranged with micro groove along be parallel to bolt, and optical fiber hole is provided on the outer surface of six nearest square nuts of micro groove radial distance, optical fiber hole and micro groove penetrate through, and form outlet；First fiber grating and the second fiber grating are located on same root optical fiber, and two fiber gratings are arranged in micro groove；First fiber grating is pasted and fixed on the bottom surface of micro groove, is used for stress monitoring；Second fiber grating is freely hanging, is used for temperature-compensating；The tail optical fiber of second fiber grating is drawn after the optical fiber hole that micro groove is led on six square nut outer surfaces.The utility model structure is simple, easy to make, and can pass through the fiber grating of setting different number, the decentered distribution situation of monitoring bolt stress.
Description
Technical field
The utility model belongs to detection technique field, the bolt stress monitoring being related in civil engineering and mechanical engineering,
More particularly to a kind of FBG monitoring device of bolt stress.
Background technique
Bolted validity in great civil engineering and mechanized equipment is extremely important, stress shape when working bolt
State is able to reflect out whether they are in normal working condition, thus about the monitoring technology of bolt stress state increasingly by
To the attention of people.
Traditional electromagnetic signal class sensing detection technology, such as piezoelectric material, resistance strain gage, since its signal is weak
Electricity is interfered vulnerable to engineering site rugged environment, and signal lead is more, and wire length is restricted seriously.And fiber grating conduct
A kind of new detecting element has electromagnetism interference, without the advantages such as drift, corrosion-resistant, the bolt stress prison based on fiber grating
Survey technology is quickly grown.One kind is disclosed application No. is the Chinese invention patent of " 201710518882.4 " to use based on fiber grating
In the intelligent gasket device that monitoring bolt loosens, fiber grating is arranged in spacer for bolt, is pressed on gasket when bolt looseness
Power reduces and optic fiber grating wavelength is caused to change, but fiber grating is to reflect bolt stress shape indirectly by gasket in this application
State, there are certain errors.Disclosing one kind application No. is the Chinese utility model patent of " 201720607339.7 " has loosening
The optical fibre intelligent screw bolt of monitoring capability uses three fiber gratings, wherein one is located in bolt axial direction micropore, measurement is answered
Power, other two fiber gratings measure acceleration, needed in monitoring according to the vibration acceleration situation of the two fiber gratings come
Analysis, it is complex.
Utility model content
For the above-mentioned problems in the prior art, the utility model provides a kind of fiber grating prison of bolt stress
Device is surveyed, structure is simple, easy to make, and can pass through the fiber grating of setting different number, the bias point of monitoring bolt stress
Cloth situation.
For this purpose, the utility model uses following technical scheme:
A kind of FBG monitoring device of bolt stress, including bolt, the first fiber grating and the second fiber grating；Institute
Stating bolt includes six square nuts, cylindrical portion, threaded portion, and the surface of the cylindrical portion is along the axial direction for being parallel to bolt
Equipped with micro groove, and optical fiber hole is provided on the outer surface of six nearest square nuts of micro groove radial distance, optical fiber hole with it is micro-
Groove perforation, forms outlet；First fiber grating and the second fiber grating are located on same root optical fiber, two optical fiber light
Grid are arranged in micro groove；First fiber grating is pasted and fixed on the bottom surface of micro groove, is used for stress monitoring；Described
Two fiber gratings are freely hanging, are used for temperature-compensating；The tail optical fiber of second fiber grating leads to six square nut outer surfaces along micro groove
On optical fiber hole after draw.
Preferably, the surface of the cylindrical portion is equipped with multiple micro grooves, is arranged with the first light in each micro groove
Fine grating and the second fiber grating are respectively used to the stress distribution situation of measurement different direction.
Preferably, the micro groove is arranged along the axial direction of cylindrical portion, and quantity is multiple, and along the week of cylindrical portion
To being evenly spaced on.
Compared with prior art, the utility model has the beneficial effects that
(1) structure is simple, easy to make.
(2) fiber grating measuring signal is not interfered by environment electromagnetics, it is easy to accomplish long-term real-time monitoring.
(3) flexible design can pass through the fiber grating of setting different number, the decentered distribution feelings of monitoring bolt stress
Condition fully understands bolt stress state.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the FBG monitoring device of bolt stress provided by the utility model.
Fig. 2 is the axonometric drawing of bolt arrangement.
Fig. 3 is the perspective view of bolt arrangement when being circumferentially equidistantly spaced from three micro grooves.
Description of symbols: 1, bolt；2, the first fiber grating；3, the second fiber grating；1-1, six square nuts；1-2, circle
Columnar part；1-3, threaded portion；1-4, micro groove；1-5, optical fiber hole.
Specific embodiment
With reference to the accompanying drawing and specific embodiment is described in detail the utility model, specific embodiment therein and says
It is bright to be only used to explain the utility model, but be not intended to limit the scope of the present invention.
As depicted in figs. 1 and 2, the utility model discloses a kind of FBG monitoring devices of bolt stress, including spiral shell
Bolt 1, the first fiber grating 2 and the second fiber grating 3；The bolt 1 includes six square nut 1-1, cylindrical portion 1-2, screw thread
The surface of part 1-3, the cylindrical portion 1-2 is axially arranged with micro groove 1-4 along be parallel to bolt 1, and in micro groove 1-4
Optical fiber hole 1-5, optical fiber hole 1-5 and micro groove 1-4 perforation are provided on the outer surface of six nearest square nut 1-1 of radial distance,
Form outlet；First fiber grating 2 and the second fiber grating 3 are located on same root optical fiber, and two fiber gratings are uniformly distributed
It sets in micro groove 1-4；First fiber grating 2 is pasted and fixed on the bottom surface of micro groove 1-4, is used for stress monitoring；It is described
Second fiber grating 3 is freely hanging, is used for temperature-compensating；The tail optical fiber of second fiber grating 3 leads to six square nuts along micro groove 1-4
It is drawn after optical fiber hole 1-5 on the outer surface 1-1.
Specifically, the surface of the cylindrical portion 1-2 is equipped with multiple micro groove 1-4, arranges in each micro groove 1-4
There are the first fiber grating 2 and the second fiber grating 3, is respectively used to the stress distribution situation of measurement different direction.
Specifically, the micro groove 1-4 is along the axial direction setting of cylindrical portion 1-2, and quantity is multiple, and along cylindrical body portion
The circumferential direction of 1-2 is divided to be evenly spaced on.
Embodiment 1
Firstly, production bolt 1, chooses one section of six square bar, get on the bus six side of part in lathe, form six square nut 1-1,
Rest part is cylindrical body, then produces threaded portion 1-3 using screw die in cylinder ends, then remaining cylindrical
At cylindrical portion 1-2, a minute recesses are axially then milled out to six side's spiral shells along bolt on the surface cylindrical body 1-2 using milling machine
Cap 1-1 right lateral surface reuses drill bit and expands inside the minute recesses to six square nut 1-1, then forming micro groove 1-4 makes
With drill bit in six square faces of six square nut 1-1, that radial distance micro groove 1-4 nearest punching above, until
With micro groove 1-4 connection, an optical fiber hole 1-5 is formed；
Secondly, arrangement fiber grating, chooses optical fiber of the band there are two fiber grating, wherein one end tail optical fiber nips off house
It goes, other end tail optical fiber is drawn after sequentially passing through micro groove 1-4 and optical fiber hole 1-5, and makes to nip off the fiber grating near tail optical fiber
It is put into micro groove 1-4 completely, another fiber grating is also fully located in micro groove 1-4, close to the light of threaded portion 1-3
Fine grating is pasted and fixed in micro groove 1-4 by adhesive, the first fiber grating 2 is formed, for measuring axial stress in bolt；
Fiber grating close to six square nut 1-1 does not paste fixation, is in free vacant state, forms the second fiber grating 3, for temperature
Degree compensation.
First fiber grating 2 perceives the strain generated when working bolt in cylindrical portion, causes the first fiber grating 2
Wave length shift, meanwhile, variation of ambient temperature also brings along the wave length shift of the first fiber grating 2, but the wave of the second fiber grating 3
Long drift is only caused by variation of ambient temperature, therefore the total wavelength shift of the first fiber grating 2 subtracts the second fiber grating 3
Wavelength shift K times (wherein temperature sensitivity coefficient ratio of the K between the first fiber grating 2 and the second fiber grating 3,
The ratio can be obtained by testing in temperature test chamber), the wave length shift generated by bolt strain can be obtained, further according to light
The measure theory of fine grating releases the corresponding strain value of wave length shift generated by bolt strain, multiplied by the poplar of bolt material
The stress value of bolt can be obtained in family name's modulus.
Embodiment 2
As shown in figure 3, using milling after producing with six square nut 1-1, cylindrical portion 1-2, threaded portion 1-3
120 ° of axially spaced-apart on the surface cylindrical body 1-2 of bed mill out three minute recesses, reuse drill bit and expand each minute recesses to six
Inside square nut 1-1, three micro groove 1-4 are formed；Then, using drill bit in six square faces of six square nut 1-1, diameter
Punched above to apart from nearest that of each micro groove 1-4, up to micro groove 1-4 connection, form three optical fiber hole 1-5；
The first fiber grating 2, the second fiber grating 3 can be then respectively arranged in three micro groove 1-4, totally three groups of measurement fiber gratings,
The stress situation on the circumferentially-spaced 120 ° of directions of bolt is perceived respectively, and more fully understanding working bolt stress state, assessment is strong
Health situation.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modification, equivalent replacement and improvement etc., should be included in this reality within the spirit and spirit of utility model
Within novel protection scope.
Claims (3)
1. a kind of FBG monitoring device of bolt stress, including bolt (1), the first fiber grating (2) and the second optical fiber light
Grid (3), it is characterised in that: the bolt (1) includes six square nuts (1-1), cylindrical portion (1-2), threaded portion (1-3),
The surface edge of the cylindrical portion (1-2) is parallel to being axially arranged with micro groove (1-4) for bolt (1), and at micro groove (1-4)
It is provided with optical fiber hole (1-5) on the outer surface of nearest six square nuts (1-1) of radial distance, optical fiber hole (1-5) and micro groove (1-
4) it penetrates through, forms outlet；First fiber grating (2) and the second fiber grating (3) are located on same root optical fiber, two light
Fine grating is arranged in micro groove (1-4)；First fiber grating (2) is pasted and fixed on the bottom surface of micro groove (1-4), uses
In stress monitoring；Second fiber grating (3) is freely hanging, is used for temperature-compensating；The tail optical fiber of second fiber grating (3) is along micro-
The optical fiber hole (1-5) that groove (1-4) is led on the outer surface six square nuts (1-1) is drawn afterwards.
2. a kind of FBG monitoring device of bolt stress according to claim 1, it is characterised in that: the cylindrical body
Partially the surface of (1-2) is equipped with multiple micro grooves (1-4), be arranged in each micro groove (1-4) the first fiber grating (2) and
Second fiber grating (3) is respectively used to the stress distribution situation of measurement different direction.
3. a kind of FBG monitoring device of bolt stress according to claim 2, it is characterised in that: the micro groove
(1-4) along the axial direction setting of cylindrical portion (1-2), quantity is multiple, and along the circumferential uniform intervals of cylindrical portion (1-2)
Distribution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821340697.7U CN208420238U (en) | 2018-08-20 | 2018-08-20 | A kind of FBG monitoring device of bolt stress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821340697.7U CN208420238U (en) | 2018-08-20 | 2018-08-20 | A kind of FBG monitoring device of bolt stress |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208420238U true CN208420238U (en) | 2019-01-22 |
Family
ID=65121914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821340697.7U Expired - Fee Related CN208420238U (en) | 2018-08-20 | 2018-08-20 | A kind of FBG monitoring device of bolt stress |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208420238U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110987254A (en) * | 2019-11-25 | 2020-04-10 | 北京宇航系统工程研究所 | Bolt load wireless monitoring system and monitoring method |
| WO2021098880A1 (en) * | 2019-11-22 | 2021-05-27 | 奥动新能源汽车科技有限公司 | Optical fiber force sensing device, and system and method for monitoring loosening of bolt or nut |
-
2018
- 2018-08-20 CN CN201821340697.7U patent/CN208420238U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021098880A1 (en) * | 2019-11-22 | 2021-05-27 | 奥动新能源汽车科技有限公司 | Optical fiber force sensing device, and system and method for monitoring loosening of bolt or nut |
| CN110987254A (en) * | 2019-11-25 | 2020-04-10 | 北京宇航系统工程研究所 | Bolt load wireless monitoring system and monitoring method |
| CN110987254B (en) * | 2019-11-25 | 2022-05-24 | 北京宇航系统工程研究所 | Bolt load wireless monitoring system and monitoring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190122 Termination date: 20190820 |