CN218156600U - Gasket type bolt force measurement optical fiber sensor - Google Patents
Gasket type bolt force measurement optical fiber sensor Download PDFInfo
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- CN218156600U CN218156600U CN202221635308.XU CN202221635308U CN218156600U CN 218156600 U CN218156600 U CN 218156600U CN 202221635308 U CN202221635308 U CN 202221635308U CN 218156600 U CN218156600 U CN 218156600U
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- temperature compensation
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- fiber grating
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Abstract
The utility model belongs to the technical field of sensors, in particular to a gasket type bolt force measurement optical fiber sensor, which comprises a base, wherein a through hole for a bolt to pass through is arranged in the middle of the base; a plurality of strain fiber gratings are uniformly distributed on the base around the through hole; a temperature compensation terminal is fixedly connected to the base, and a temperature compensation fiber grating is fixedly connected to the temperature compensation terminal; the strain fiber grating is connected with the temperature compensation fiber grating in series. The utility model discloses simple structure, the installation is simple and easy, through its inside through-hole cover to bolt to through outside nut and gasket fixed mounting, after the bolt stress changes, on stress transmission to the base, thereby arouse the tank bottom to take place deformation, thereby change the wavelength of pasting the fiber grating that meets an emergency at the tank bottom, change the detection of realization to stress through detecting the wavelength.
Description
Technical Field
The utility model belongs to the technical field of the sensor, concretely relates to gasket formula bolt dynamometry optical fiber sensor.
Background
Fiber gratings have been widely used in the field of fiber sensing since the advent. The fiber grating sensor has the advantages of electromagnetic interference resistance, corrosion resistance, electrical insulation, high sensitivity, low cost, good compatibility with common optical fibers and the like, so the fiber grating sensor is more and more concerned. The resonant wavelength of the fiber grating is sensitive to stress strain and temperature change, so the fiber grating is mainly used for measuring the temperature and the stress strain. The sensor obtains sensing information by modulating the central wavelength of the Bragg fiber grating by an external parameter (temperature or stress strain). Therefore, the sensor has high sensitivity, strong anti-interference capability and low requirements on the energy and stability of the light source, and is suitable for precise and accurate measurement. The method can be suitable for various scenes and can be used for detecting and feeding back various environments.
The bolt stress sensor in the prior art needs to perform punching operation inside the bolt so as to install other detection parts, which damages the structure of the bolt and influences the strength of the bolt, so the bolt stress sensor is more convenient to be used in the actual use process and is not suitable for large-scale popularization and use.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned not enough, the utility model aims at providing a gasket formula bolt dynamometry optical fiber sensor.
The utility model provides a following technical scheme:
a gasket type bolt force measurement optical fiber sensor comprises a base, wherein a through hole for a bolt to pass through is formed in the middle of the base; a plurality of strain fiber gratings are uniformly distributed on the base around the through hole;
a temperature compensation terminal is fixedly connected to the base, and a temperature compensation fiber grating is fixedly connected to the temperature compensation terminal;
the strain fiber grating is connected with the temperature compensation fiber grating in series.
The base is provided with an annular groove which is concentric with the through hole, and a hollow cylinder is reserved between the annular groove and the through hole; the strain fiber bragg grating is fixedly connected to the bottom of the annular groove; the temperature compensation terminal is fixedly connected to the edge of the groove bottom.
An upper cover is arranged at the notch of the annular groove to ensure that the groove cavity of the annular groove forms a sealed space, and an upper cover hole for allowing the hollow cylinder to pass through is arranged in the middle of the upper cover.
The hole wall of the upper cover hole is provided with an O-shaped sealing ring mounting groove, and an O-shaped sealing ring is mounted between the upper cover and the hollow cylinder.
The outer wall of the upper cover is provided with a circular step surface, and the circular step surface is provided with an external thread; the groove wall of the annular groove is provided with internal threads; the upper cover is in threaded connection with the base.
The strain fiber grating is bonded at the bottom of the groove through polyimide glue; the temperature compensation terminal is bonded at the edge of the groove bottom through AB glue; the temperature compensation fiber grating is bonded on the upper end of the temperature compensation terminal through polyimide glue.
One side of the base is provided with a threaded hole communicated with the annular groove; the elbow is provided with an external thread connecting head I which is arranged in the threaded hole; a wire pressing terminal is connected in the internal thread connector arranged on the elbow through threads, and the wire pressing terminal is provided with an external thread connector II connected with the internal thread connector;
the elbow and the line pressing terminal are both provided with through cavities which are communicated with the threaded holes and allow the lead to penetrate out;
the lead is an armored optical cable.
The base and the temperature compensation terminal are both made of 316L stainless steel.
An arc-shaped groove is formed in the outer side of the lower portion of the base.
The utility model has the advantages that:
the utility model discloses simple structure, the installation is simple and easy, through its inside through-hole cover to bolt to through outside nut and gasket fixed mounting, after the bolt stress changes, on stress transmission arrives the base, thereby arouse the tank bottom to take place deformation, thereby change the wavelength of pasting the fiber grating that meets an emergency at the tank bottom, change the detection of realization counter stress through detecting the wavelength. The invention solves the problem that the existing bolt force-measuring optical fiber sensor causes damage to the bolt, and can be installed and used on the premise of not damaging the existing bolt structure. The invention also overcomes the problems of the condensation and the electromagnetic interference inside the sensor in the humid air by installing the strain fiber grating in the sealed space, thereby greatly prolonging the service life of the sensor and the reliability of the sensor under the electromagnetic interference. The utility model discloses on can installing the bolt fast, not destroy the bolt structure, do not influence bolt strength to applicable in the bolt that is using, carry out real-time supervision to its stress variation.
Drawings
Fig. 1 is a top view of the present invention;
FIG. 2 isbase:Sub>A sectional view taken along line A-A of FIG. 1;
FIG. 3 is a top view of the present invention with the upper cover removed;
FIG. 4 is a side view of the upper cover;
FIG. 5 is a cross-sectional view of the upper cover;
FIG. 6 is a side view of the base;
FIG. 7 is a cross-sectional view of the base;
fig. 8 is a side view of the wire crimping terminal;
FIG. 9 is a cross-sectional view of the wire crimping terminal;
figure 10 is a cross-sectional view of an elbow.
Labeled as: the optical fiber grating strain gauge comprises an upper cover 11, a circular step surface 12, an O-shaped sealing ring mounting groove 13, a threaded hole 31, a base 32, an internal thread 33, a hollow cylinder 34, a groove bottom 35, a through hole 36, an annular groove 37, an arc-shaped groove 38, a strain optical fiber grating 4, a temperature compensation terminal 5, a temperature compensation optical fiber grating 6, an internal thread connector 71, a first external thread connector 72, an elbow 73, a second external thread connector 81 and a line pressing terminal 82.
Detailed Description
Example one
As shown in fig. 1 to 10, a shim type bolt force measurement optical fiber sensor includes a base 32, a through hole 36 for a bolt to pass through is centrally disposed on the base 32, and a plurality of strain optical fiber gratings 4 are uniformly distributed on the base 32 around the through hole 36. During installation, the base 32 is sleeved on the bolt, and then nuts and gaskets are installed on the upper side and the lower side of the base 32, so that the base 32 is fixed.
The influence of temperature on the fiber grating is a very serious problem, and therefore, temperature compensation must be adopted. Still fixedly connected with temperature compensation terminal 5 on the base 32, fixedly connected with temperature compensation fiber grating 6 on the temperature compensation terminal 5. The strain fiber grating 4 is connected with the temperature compensation fiber grating 6 in series.
Specifically, the base 32 is provided with an annular groove 37, the annular groove 37 is concentric with the through hole 36, and the hollow cylinder 34 is left between the annular groove 37 and the through hole 36. The strain fiber grating 4 is fixedly connected to the groove bottom 35 of the annular groove 37. The temperature compensation terminal 5 is fixedly connected to the edge of the groove bottom 35. Specifically, the strain fiber grating 4 is bonded to the groove bottom 35 through a polyimide adhesive, the temperature compensation terminal 5 is bonded to the edge of the groove bottom 35 through an AB adhesive, and the temperature compensation fiber grating 6 is bonded to the upper end of the temperature compensation terminal 5 through the polyimide adhesive.
After the base 32 is installed on the bolt, the stress change of the bolt can be transmitted to the base 32 and then transmitted to the groove bottom 35, the groove bottom 35 deforms, so that the wavelength of the strain fiber grating 4 is changed, after the bolt is subjected to the stress change, the wavelength of the strain fiber grating 4 can change along with the change of the stress, and the value of the stress of the bolt at the moment can be obtained according to the average value of the wavelengths of a plurality of strain fiber gratings 4.
The optical fiber sensor is seriously influenced by the temperature, so that an independent temperature compensation optical fiber grating 6 is needed to monitor the temperature in real time, the influence of the temperature on the optical fiber is removed, and the actual temperature can be calculated by the following formula:
T＝K T (λ T -λ T0 )
where T is the real-time temperature of the sensor, K T Lambda is used for temperature compensation of the temperature coefficient of the fiber grating (the temperature coefficient needs to be calibrated in advance) T For temperature compensation of the wavelength, λ, of the fibre grating T0 Is the initial wavelength of the temperature compensated fiber grating.
After the change of the temperature on the other wavelengths of the strain fiber gratings 4 is obtained, the change is removed, and the actual stress value of the bolt is calculated through the following formula:
σ＝K 1 [(λ 1 -λ 10 )-K T (λ T -λ T0 )]
where σ is the actual stress of the bolt, K 1 The average stress coefficient (the stress coefficient needs to be calibrated in advance) of several strain fiber gratings is lambda 1 Is the average wavelength, λ, of several strained fiber gratings 10 Is the average initial wavelength of several strained fiber gratings. To be noted K 1 、K T Is a constant value calibrated at the time of sensor fabrication.
One side of the base 32 is provided with a threaded hole 31 which is connected with the annular groove 37 in a penetrating way. The elbow 73 is provided with a first male connector 72 which is mounted in the threaded bore 31. A line pressing terminal 82 is connected in the internal thread connector 71 of the elbow 73 through threads, and the line pressing terminal 82 is provided with a second external thread connector 81 connected with the internal thread connector 71. The elbow 73 and the line pressing terminal 82 are both provided with through cavities which are connected with the threaded holes 31 in a penetrating way and allow the lead to penetrate out. The lead wires are armored cables so that the internal optical fibers can be protected.
The upper cover 11 is arranged on the notch of the annular groove 37, so that the cavity of the annular groove 37 forms a sealed space, and an upper cover hole for the hollow cylinder 34 to pass through is arranged in the center of the upper cover 11. The hole wall of the upper cover hole is provided with an O-shaped sealing ring mounting groove 13, and an O-shaped sealing ring is mounted between the upper cover 11 and the hollow cylinder 34. The outer wall of the upper cover 11 is provided with a round step surface 12, and the round step surface 12 is provided with an external thread. The groove wall of the annular groove 37 is provided with internal threads 33, and the upper cover 11 is in threaded connection with the base 32. By forming the annular groove 37 as a waterproof sealed space, the fiber grating attached inside can be protected, and water drops formed by humid air are prevented from entering the inside and damaging the internal structure.
The base 32 is integrally made of 316L stainless steel, so that the stress on the groove bottom 35 and the bolt pressure can be guaranteed to change in a linear relation.
The material of the temperature compensation terminal 5 is 316L stainless steel. The influence of the temperature on the fiber grating is a very serious problem, and therefore, temperature compensation must be adopted. Since the base 32 is made of 316L stainless steel, the thermal compensation terminal 5 is made of a material having the same thermal expansion coefficient as 316L stainless steel, and therefore 316L stainless steel is used. This compensates for the amount of change in the slot bottom 35 as it is affected by temperature changes.
Example two
The difference between the present embodiment and the present embodiment is that the arc groove 38 is disposed on the outer side of the lower portion of the base 32, so that the base 32 is more easily deformed when being stressed, and the force applied to the bolt can be completely transmitted to the groove bottom 35, so that the groove bottom 35 is deformed, and the detection accuracy is improved.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A shim type bolt force measurement optical fiber sensor is characterized in that: comprises a base (32), wherein a through hole (36) for a bolt to pass through is arranged in the center of the base (32); a plurality of strain fiber gratings (4) are uniformly distributed on the base (32) positioned at the periphery of the through hole (36);
a temperature compensation terminal (5) is fixedly connected to the base (32), and a temperature compensation fiber grating (6) is fixedly connected to the temperature compensation terminal (5);
the strain fiber grating (4) is connected with the temperature compensation fiber grating (6) in series.
2. The shim bolt load cell fiber optic sensor according to claim 1, wherein: the base (32) is provided with an annular groove (37), the annular groove (37) is concentric with the through hole (36), and a hollow cylinder (34) is reserved between the annular groove (37) and the through hole (36); the strain fiber grating (4) is fixedly connected with the groove bottom (35) of the annular groove (37); the temperature compensation terminal (5) is fixedly connected with the edge of the groove bottom (35).
3. The shim bolt load cell fiber optic sensor according to claim 2, wherein: an upper cover (11) is installed on the notch of the annular groove (37), a groove cavity of the annular groove (37) forms a sealed space, and an upper cover hole for the hollow cylinder (34) to penetrate through is arranged in the middle of the upper cover (11).
4. The shim bolt load cell fiber optic sensor of claim 3, wherein: an O-shaped sealing ring mounting groove (13) is arranged on the wall of the upper cover hole, and an O-shaped sealing ring is mounted between the upper cover (11) and the hollow cylinder (34).
5. The shim bolt load cell fiber optic sensor of claim 4, wherein: the outer wall of the upper cover (11) is provided with a round step surface (12), and the round step surface (12) is provided with an external thread; the groove wall of the annular groove (37) is provided with an internal thread (33); the upper cover (11) is connected with the base (32) through screw threads.
6. The shim bolt load cell fiber optic sensor according to claim 2, wherein: the strain fiber grating (4) is bonded at the groove bottom (35) through polyimide glue; the temperature compensation terminal (5) is bonded at the edge of the groove bottom (35) through AB glue; the temperature compensation fiber grating (6) is bonded on the upper end of the temperature compensation terminal (5) through polyimide glue.
7. The shim bolt load cell fiber optic sensor according to claim 2, wherein: one side of the base (32) is provided with a threaded hole (31) which is communicated with the annular groove (37); a first external thread connecting head (72) arranged on the elbow (73) is arranged in the threaded hole (31); a wire pressing terminal (82) is connected in the internal thread connector (71) arranged on the elbow (73) through threads, and the wire pressing terminal (82) is provided with a second external thread connector (81) connected with the internal thread connector (71);
the elbow (73) and the line pressing terminal (82) are both provided with through cavities which are communicated with the threaded hole (31) and allow the lead to penetrate out.
8. The shim bolt load cell fiber optic sensor of claim 7, wherein: the lead is an armored optical cable.
9. The shim bolt load cell fiber optic sensor according to any one of claims 1 to 8, wherein: the base (32) and the temperature compensation terminal (5) are both made of 316L stainless steel.
10. The shim bolt load cell fiber optic sensor according to claim 9, wherein: an arc-shaped groove (38) is formed in the outer side of the lower portion of the base (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221635308.XU CN218156600U (en) | 2022-06-27 | 2022-06-27 | Gasket type bolt force measurement optical fiber sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221635308.XU CN218156600U (en) | 2022-06-27 | 2022-06-27 | Gasket type bolt force measurement optical fiber sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218156600U true CN218156600U (en) | 2022-12-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221635308.XU Active CN218156600U (en) | 2022-06-27 | 2022-06-27 | Gasket type bolt force measurement optical fiber sensor |
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| Country | Link |
|---|---|
| CN (1) | CN218156600U (en) |
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2022
- 2022-06-27 CN CN202221635308.XU patent/CN218156600U/en active Active
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