CN206756107U - A kind of nut strain and device for detecting temperature based on FBG Sensing Technology - Google Patents
A kind of nut strain and device for detecting temperature based on FBG Sensing Technology Download PDFInfo
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- CN206756107U CN206756107U CN201720250953.2U CN201720250953U CN206756107U CN 206756107 U CN206756107 U CN 206756107U CN 201720250953 U CN201720250953 U CN 201720250953U CN 206756107 U CN206756107 U CN 206756107U
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Abstract
It the utility model is related to a kind of nut strain based on FBG Sensing Technology and device for detecting temperature, the nut strains and device for detecting temperature includes strain monitoring grating and temperature monitoring grating, connected by armored fiber optic, strain monitoring grating and temperature monitoring grating are embedded in nut at an angle, realize strain and the temperature monitoring of nut.When the operating mode of nut changes, straining the wavelength shift of grating and temperature grating will change, and the stress and temperature level of nut is calculated.The strain that is combined using optical fiber sensing technology with nut, device for detecting temperature, are realized the real-time monitoring of nut state, effectively prevent the generation of the events such as nut loosening, bolt fracture, and record is tracked to complete event.The utility model can effectively improve the sensitivity of monitoring, have stronger anti-electromagnetic interference capability, and strain and temperature can be monitored simultaneously.
Description
Technical field
A kind of nut strain and device for detecting temperature are the utility model is related to, is specifically that one kind is based on optical fiber Bragg raster
The blower fan tower barrel nut strain of sensing technology and device for detecting temperature.
Background technology
Offshore wind farm belongs to new industry in China, and the blower fan tower barrel nut monitoring scheme applied to market has at present：Difference
The monitoring of resistive nut pressure monitoring, implanted stud tension monitoring and bolt tightening torque.This several scheme has following respectively
Defect：
1. poor resistive nut pressure monitoring：
Poor resistive nut pressure monitoring is to carry out pressure measxurement using the steel wire of tensioning, poor resistive sensor output
It is resistance value and resistance ratio, you can draw the size of measured nut pressure.Shortcoming：This method strong electromagnetic in wind power plant is done
The continuity of data long-term acquisition and reliability are affected in the case of disturbing, and can not form the continuous monitoring to temperature.
2. implanted stud tension monitoring：
Forming direct monitoring to stud by way of stud internal openings implanted sensor.Shortcoming：To stud in itself
Intensity effect it is larger, long-term use certain potential safety hazard be present.
3. the monitoring of bolt tightening torque：
The phenomenon of deficiency is twisted and twisted in order to avoid super stubborn, leakage occurs after fastener cycle and fastening for bolt, uses torque spanner
Steady firmly gradual increase torque, when nut or bolt just have started to produce minor rotation, its instantaneous torque value is maximum, continues
Rotate, torque value will fall back to of short duration stable state, and torque value at this moment is the moment of torsion for checking gained.Shortcoming：Every time
Inspection needs manual operation, it is impossible to long-term on-line monitoring.
Utility model content
The utility model proposes it is a kind of based on FBG Sensing Technology nut strain and device for detecting temperature,
The present apparatus forms long-term on-line monitoring using optical fiber Bragg grating sensor to wind power plant nut.
Used technical scheme is as follows：
A kind of nut strain and device for detecting temperature based on FBG Sensing Technology, it is characterised in that：Including
Nut including the optical fiber Bragg grating sensor and armored fiber optic of strain grating and temperature-compensating grating, wherein the armouring light
The fibre electrical connection strain grating and temperature-compensating grating.
Further, the nut is hexagonal (hexagon)nut, including the first to the 6th face.
Further, first face and fourth face are the skewed slot that depth and width are 1mm, the 3rd and the 5th face
Be 3mm straight trough for depth and width, described second and the 6th face be level trough.
Further, the strain grating is arranged on first face, and the temperature-compensating grating is arranged at fourth face
On, the armored fiber optic is arranged on the second to the 5th face.
Further, the strain grating and the angle of temperature-compensating grating and horizontal plane are 45 °.
Further, the device uses nut corresponding to standard M36 bolts, and its internal diameter is 36mm, is highly 55mm, wherein
Each face in the first to the 6th face is highly 30mm, width 27.5mm.
Further, the bending radius of the armored fiber optic is more than 30mm.
The utility model has advantages below compared with prior art：
1st, the utility model is simple in construction, reasonable in design and use is easy to operate.
2nd, the size of the utility model strain optical grating axial strain is 1.414 times of bolt axial strain, plays amplification,
So that improve 41.4% compared to vertically arranged traditional sensors sensitivity.
3rd, the utility model each face highly on 30mm nut by making strain grating horizontal by 45 ° of side
Method solves optical fiber Bragg grating sensor routing problem, tilts 45 ° and installs the radius of curvature that can either increase grating, and can
Enough testing requirements met to pressure, temperature-compensating grating and the horizontal plane angle of fourth face are 45 °, are formed symmetrically with the first face
Structure, make uniform force.
4th, the utility model is rejected because environment temperature changes the influence to straining test value, together using temperature-compensating grating
When real-time monitoring is formed to the temperature in tower.
5th, optical fiber sensing technology is applied to nut status monitoring by the utility model, and anti-electromagnetic interference capability is strong, is adapted to remote
The long-term on-line monitoring of distance.
6th, the utility model can be monitored on the premise of bolt strength is not destroyed to pulling force suffered by bolt.
According to below with reference to the accompanying drawings to detailed description of illustrative embodiments, further feature of the present utility model and aspect will
It is made apparent from.
Brief description of the drawings
Comprising in the description and the accompanying drawing of a part for constitution instruction and specification together illustrate this practicality newly
Exemplary embodiment, feature and the aspect of type, and for explaining principle of the present utility model.
Fig. 1 is nut schematic top plan view.
Fig. 2 (a) is the first face of nut optical fiber Bragg grating sensor artwork.
Fig. 2 (b) is nut fourth face optical fiber Bragg grating sensor artwork.
Fig. 3 (a) is the face of nut first fluting schematic diagram.
Fig. 3 (b) is nut fourth face fluting schematic diagram.
Embodiment
In order that content of the present utility model is easier to be clearly understood, below according to specific embodiment and combine attached
Figure, is described in further detail to the utility model.
Reference is as follows：Nut 1, the first face skewed slot 2, the second face level trough 3, the 6th face level trough 4, fourth face skewed slot
5, the 3rd face straight trough 6, the 5th face straight trough 7, grating 8 is strained, containing cladded-fiber 9, armored fiber optic 10, temperature-compensating grating 11.
Fiber grating is made using the light sensitive characteristic in optical fiber, and optical fiber Bragg grating sensor is fibre optical sensor
One kind, for a kind of reflection or short-period grating, the sensing process based on fiber grating be by extraneous physical parameter (temperature and
Stress) modulation to optical fiber Bragg (Bragg) wavelength obtains heat transfer agent, and it is a kind of wavelength modulation fiber sensor
Have that electromagnetism interference, size are small, in light weight, temperature tolerance is good, highly sensitive using the sensor of the optical fiber Bragg raster technology
The advantages that degree, passive, easy deformation, it is widely used in field of civil engineering, such as building, bridge, the utility model use it
To measure the temperature of the nut of fixed blower fan tower barrel and pressure.
As illustrated in the accompanying drawings from 1 to 3, the utility model includes nut 1 including strains the optical fiber of grating 8 and temperature-compensating grating 11
Bragg grating sensors and armored fiber optic 10, wherein the armored fiber optic 10 electrically connects the strain grating 8 and temperature-compensating light
Grid 11, specially temperature-compensating grating 11 are connected by armored fiber optic 10 with strain grating 8.
The nut is hexagonal (hexagon)nut, including the first to the 6th face, and first face and fourth face are that depth and width are equal
For 1mm skewed slot 2 and 5, the 3rd and the 5th face is the straight trough 6 and 7 that depth and width are 3mm, described second and the 6th
Face is level trough 3 and 4.
In nut 1：First face skewed slot 2, the second face level trough 3, the 6th face level trough 4, fourth face skewed slot 5, the 3rd face are straight
Groove 6, the 5th face straight trough 7, the monitoring device also include strain grating 8, containing cladded-fiber 9, armored fiber optic 10 and temperature-compensating light
Grid 11.Described to be installed along with containing cladded-fiber 9 and strain grating 8 on the first face skewed slot 2, the temperature-compensating grating 11 is installed
On fourth face skewed slot 5, the armored fiber optic 10 is arranged in the straight of on the level trough 3 and 4 in second, six faces and the 3rd and the 5th face
On groove 6 and 7.
The device uses nut 1 corresponding to standard M36 bolts, and its internal diameter is 36mm, is highly 55mm, wherein first to
Each face in six faces is highly 30mm, width 27.5mm.
The bending radius of the armored fiber optic 10 is more than 30mm.
As shown in figure 1, nut is hexagonal (hexagon)nut, optical fiber Bragg grating sensor is integrated in nut, forms effectively prison
Survey.
As shown in Fig. 2 (a), strain grating 8 and horizontal plane angle installed in the face of nut first are 45 °, and bolt is by axial direction
Pressure causes to strain the axially generation pressure of grating 8, and the size of the strain axial strain of grating 8 is 1.414 times of bolt axial strain,
Play amplification.
As shown in Fig. 2 (b), temperature-compensating grating 11 and horizontal plane angle installed in nut fourth face are also 45 °, with
First face forms symmetrical structure, makes uniform force.
As shown in Figure 2,3, armored fiber optic 10 is arranged horizontally, and forms one-in-and-one-out, is passed for other optical fiber Bragg rasters
Sensor nut is provided in series basis.
Operation principle of the present utility model is：In use, optical fiber Bragg grating sensor is arranged on to the spiral shell for needing to monitor
On bolt, it will specially strain grating 8 and be arranged on the first face skewed slot 2 of nut, for being monitored to nut pressure；Bag will be contained
Layer optical fiber 9 is also mounted on the first face skewed slot 2, is transmitted for signal；Temperature-compensating grating 11 is arranged on fourth face skewed slot 5
On, for temperature monitoring and compensation；Armored fiber optic 10 is arranged on the straight trough 6 and 7 in the 3rd and the 5th face, plays protection optical fiber
And signal transmitting effect.Grating 8 and temperature-compensating grating 11 will be strained so that with the horizontal 45 ° of installations, its object is to increase
Reduce its size while the measurement sensitivity of optical fiber Bragg grating sensor, can be used in optical fiber Bragg grating sensor
Nut strain monitoring.Can be by different size of pretightning force, with the change of operating mode, the pressure suffered by nut in nut installation process
Power, which changes, can cause the wavelength shift of strain monitoring grating to change, while by rejecting the ripple of temperature-compensating grating
Long drift value, by the way that the size of bolt pressure is calculated, the temperature-compensating grating of installation can record nut temperature in real time
Degree situation, real-time monitoring is formed to nut strain, temperature.
It is described above, only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to
In this, any one skilled in the art can readily occur in change in the technical scope that the utility model discloses
Or replace, it should all cover within the scope of protection of the utility model.
Claims (7)
1. a kind of nut strain and device for detecting temperature based on FBG Sensing Technology, it is characterised in that：Including spiral shell
Cap (1) including the optical fiber Bragg grating sensor and armored fiber optic (10) of strain grating (8) and temperature-compensating grating (11), its
In, armored fiber optic (10) electrical connection is described to strain grating (8) and temperature-compensating grating (11).
2. device according to claim 1, it is characterised in that：The nut (1) is hexagonal (hexagon)nut, including first to the 6th
Face.
3. device according to claim 2, it is characterised in that：First face and fourth face are for depth and width
1mm skewed slot (2,5), the 3rd and the 5th face be depth and width be 3mm straight trough (6,7), described second and the 6th
Face is level trough (3,4).
4. the device according to Claims 2 or 3, it is characterised in that：The strain grating (8) is arranged on first face
On, the temperature-compensating grating (11) is arranged on the fourth face, and the armored fiber optic (10) is arranged at described second to
On five faces.
5. device according to claim 4, it is characterised in that：It is described strain grating (8) and temperature-compensating grating (11) and
The angle of horizontal plane is 45 °.
6. device according to claim 5, it is characterised in that：The device uses nut corresponding to standard M36 bolts, in it
Footpath is 36mm, is highly 55mm, wherein each face in the described first to the 6th face is highly 30mm, width 27.5mm.
7. according to the device described in any one of claims 1 to 3, it is characterised in that：The bending radius of the armored fiber optic (10)
More than 30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720250953.2U CN206756107U (en) | 2017-03-15 | 2017-03-15 | A kind of nut strain and device for detecting temperature based on FBG Sensing Technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720250953.2U CN206756107U (en) | 2017-03-15 | 2017-03-15 | A kind of nut strain and device for detecting temperature based on FBG Sensing Technology |
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| Publication Number | Publication Date |
|---|---|
| CN206756107U true CN206756107U (en) | 2017-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720250953.2U Active CN206756107U (en) | 2017-03-15 | 2017-03-15 | A kind of nut strain and device for detecting temperature based on FBG Sensing Technology |
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| CN (1) | CN206756107U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109269433A (en) * | 2018-08-03 | 2019-01-25 | 武汉理工大学 | A kind of clip based on optical fiber grating sensing with temperature self-compensation is loosened from monitoring device and method |
-
2017
- 2017-03-15 CN CN201720250953.2U patent/CN206756107U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109269433A (en) * | 2018-08-03 | 2019-01-25 | 武汉理工大学 | A kind of clip based on optical fiber grating sensing with temperature self-compensation is loosened from monitoring device and method |
| CN109269433B (en) * | 2018-08-03 | 2020-08-04 | 武汉理工大学 | Clamp based on fiber bragg grating sensing belt temperature compensation and monitoring method |
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