CN209623930U - A kind of optical fiber axle power bolt - Google Patents
A kind of optical fiber axle power bolt Download PDFInfo
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- CN209623930U CN209623930U CN201822066561.8U CN201822066561U CN209623930U CN 209623930 U CN209623930 U CN 209623930U CN 201822066561 U CN201822066561 U CN 201822066561U CN 209623930 U CN209623930 U CN 209623930U
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- bolt
- blind hole
- optical fiber
- axle power
- fiber
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Abstract
The utility model provides a kind of optical fiber axle power bolt, including bolt and built-in fiber-optic grating sensor, it is blind hole among bolt, built-in fiber grating sensor in blind hole, blind hole is stepped ramp type, and top is major diameter, and lower part is minor diameter, the middle part of minor diameter blind hole is fixed in fiber-optic grating sensor one end, and the other end is outside blind hole deepening to bolt；Axial force suffered by the direct monitoring bolt of optical fiber axle power bolt, the influence of suffered non-linear factor is smaller, and precision is high, and structure is simple, is suitable for a variety of materials bolt, and have many advantages, such as it is corrosion-resistant, it is affected by environment small, efficiently solve Axial stress in bolt test problem.
Description
Technical field
The invention belongs to MACHINERY JOINT fields, and in particular to dynamometry bolt arrangement and preparation method thereof.
Background technique
Bolt is as common fastener, using very wide in the fields such as aerospace, rail traffic, national defence, electric power
It is general.Bolt is as union piece, and bolt is by pretightning force when by extraneous pressure and installation, if control is improper or even
So overload will lead to Joint failure.The life and property loss caused by some key areas such as space flight, this accident is huge.
Therefore directly and accurately monitor the axial stress with control bolt has great to guarantee the safety and reliability of its work
Meaning.Although Axial stress in bolt is rough Axial stress in bolt can be calculated, due to spiral shell there are general calculation method
Suffered influence factor is relatively more during the installation process for bolt, so needing to test the axial force of bolt.
The measuring technique moment spanner for the Axial stress in bolt that is generallyd use both at home and abroad in practical engineering applications controls
Method, electric resistance strain film method, specific feature and there are the problem of it is as follows.
1 torque spanner control methods
Torque spanner control methods are that a kind of most common measurement and control bolt pretightening method are applied in current engineering.Its
Principle be indirectly control bolt pretightening according to torque but in a practical situation, due to nut and bolt flank and
The discreteness of friction factor between nut and the contact surface of connected piece causes in the other threaded connection of the discrete of torque coefficient
There are serious stress concentration phenomenon always to generate biggish elastic-plastic deformation in the material of the regional areas such as thread root
This also influences the control of pretightning force to a certain extent.
2 strain gage testing methods
Although strain gage testing method is also a kind of its this method of the measurement method for the bolt stress being often used in engineering
The higher of measurement accuracy but the stress for being only capable of reflection tested bolt surface are similarly subjected to the influence and bolt of stress raisers
When applying stubborn, surface, which can generate certain shearing deformation, causes measurement result and practical axial stress to have deviation furthermore
Fastening and on non-detachable bolt application have significant limitation.
In conclusion the measurement of Axial stress in bolt is influenced by non-linear factor and environment in the prior art, cause to survey
The inaccuracy of amount.
Summary of the invention
(1) the technical issues of solving
When in order to eliminate Axial stress in bolt test, non-linear factor and such environmental effects, the present invention use fiber grating
Sensor tests axial force suffered by bolt.
(2) technical solution
A kind of optical fiber axle power bolt of the present invention is blind hole among bolt including bolt and built-in fiber-optic grating sensor,
Built-in fiber grating sensor in blind hole, blind hole are stepped ramp type, and top is major diameter, and lower part is minor diameter, optical fiber grating sensing
The middle part of minor diameter blind hole is fixed in device one end, and the other end is outside blind hole deepening to bolt.
Further, the use encapsulating mode of the fiber-optic grating sensor is fixed in blind hole together with fixed glue.
Further, the fixing seal damp-proof layer outside blind hole.
Further, the fixed glue is loctiteE-30CL solid gum.
Further, the damp-proof layer uses GD414 solid gum.
Further, ferrule is inserted in the outer end of fiber-optic grating sensor.
Further, increase silicon rubber outside blind hole and carry out reinforcement protection
Working principle: optical fiber axle power bolt is fixed in practical structures, when bolt bears load, optical fiber grating sensing
Device receives strain variation, is conducted sensor received signal to fiber grating demodulation by optical fiber, while according to practical light
Gate signal is accordingly arranged on (FBG) demodulator software, realizes data acquisition.
(3) beneficial effects of the present invention:
Axial force suffered by the direct monitoring bolt of optical fiber axle power bolt, the influence of suffered non-linear factor is smaller, and precision is high, knot
Structure is simple, be suitable for a variety of materials bolt, and have many advantages, such as it is corrosion-resistant, it is affected by environment small, efficiently solve bolt axle
To power test problem.
Detailed description of the invention
Fig. 1: optical fiber axle power bolt arrangement schematic diagram；
Wherein, 1- bolt；2- blind hole；3- fiber-optic grating sensor；4- solid gum；5- sealed damp-proof layer.
Specific embodiment
In addition to embodiment described below, the present invention can also have other embodiments or be implemented in different ways.Therefore,
It should be known that the invention is not limited to it is described in the following description or in the accompanying drawings shown in component structure it is detailed
Situation.
As shown in Figure 1, a kind of optical fiber axle power bolt, including bolt 1 and built-in fiber-optic grating sensor 3, among bolt
For blind hole 2, built-in fiber grating sensor 3 in blind hole 2, blind hole 2 is stepped ramp type, and top is major diameter, and lower part is minor diameter, light
3 one end of fiber grating sensor is fixed on the middle part of minor diameter blind hole using encapsulating mode together with solid gum 4, and the other end is along blind hole
Outside deepening to bolt, the fixing seal damp-proof layer 5 outside blind hole.
The fixed glue is loctiteE-30CL solid gum, and the damp-proof layer uses GD414 solid gum；Fibre optical sensor
0.9mm ferrule is inserted in one end outside, increases silicon rubber outside blind hole and carries out reinforcement protection
Working principle: optical fiber axle power bolt is fixed in practical structures, when bolt bears load, optical fiber grating sensing
Device receives strain variation, is conducted sensor received signal to fiber grating demodulation by optical fiber, while according to practical light
Gate signal is accordingly arranged on (FBG) demodulator software, realizes data acquisition.
The present invention is explained in detail above in conjunction with drawings and examples, but the present invention is not limited to above-mentioned implementations
Example, within the knowledge of a person skilled in the art, can also do without departing from the purpose of the present invention
Various change out, the content that is not described in detail can use the prior art in the present invention.
Claims (7)
- Be blind hole among bolt including bolt and built-in fiber-optic grating sensor 1. a kind of optical fiber axle power bolt, in blind hole in Set fiber-optic grating sensor, which is characterized in that blind hole is stepped ramp type, and top is major diameter, and lower part is minor diameter, and fiber grating passes The middle part of minor diameter blind hole is fixed in sensor one end, and the other end is outside blind hole deepening to bolt.
- 2. optical fiber axle power bolt as described in claim 1, which is characterized in that the fiber-optic grating sensor is used using filling Glue mode is fixed in blind hole together with fixed glue.
- 3. optical fiber axle power bolt as described in claim 1, which is characterized in that the fixing seal damp-proof layer outside blind hole.
- 4. optical fiber axle power bolt as claimed in claim 2, which is characterized in that the fixed glue is loctiteE-30CL solid Glue.
- 5. optical fiber axle power bolt as claimed in claim 3, which is characterized in that the damp-proof layer uses GD414 solid gum.
- 6. optical fiber axle power bolt as described in claim 1, which is characterized in that an end cap of the fiber-optic grating sensor outside bolt Enter ferrule.
- 7. optical fiber axle power bolt as described in claim 1, which is characterized in that increase silicon rubber reinforce anti-outside blind hole Shield.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822066561.8U CN209623930U (en) | 2018-12-10 | 2018-12-10 | A kind of optical fiber axle power bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822066561.8U CN209623930U (en) | 2018-12-10 | 2018-12-10 | A kind of optical fiber axle power bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209623930U true CN209623930U (en) | 2019-11-12 |
Family
ID=68445453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822066561.8U Active CN209623930U (en) | 2018-12-10 | 2018-12-10 | A kind of optical fiber axle power bolt |
Country Status (1)
| Country | Link |
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| CN (1) | CN209623930U (en) |
Cited By (3)
| 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 |
| CN112177624A (en) * | 2020-09-28 | 2021-01-05 | 中铁隧道局集团有限公司 | Load monitoring device for shield TBM cutter hob seat bolt and using method thereof |
| CN112229552A (en) * | 2020-10-15 | 2021-01-15 | 武汉科技大学 | Bolt distributed stress state monitoring fiber bragg grating sensor not affected by torque |
-
2018
- 2018-12-10 CN CN201822066561.8U patent/CN209623930U/en active Active
Cited By (4)
| 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 |
| 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 |
| CN112177624A (en) * | 2020-09-28 | 2021-01-05 | 中铁隧道局集团有限公司 | Load monitoring device for shield TBM cutter hob seat bolt and using method thereof |
| CN112229552A (en) * | 2020-10-15 | 2021-01-15 | 武汉科技大学 | Bolt distributed stress state monitoring fiber bragg grating sensor not affected by torque |
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