CN110748549B - Intelligent gasket of pretightning force monitoring - Google Patents
Intelligent gasket of pretightning force monitoring Download PDFInfo
- Publication number
- CN110748549B CN110748549B CN201911037137.3A CN201911037137A CN110748549B CN 110748549 B CN110748549 B CN 110748549B CN 201911037137 A CN201911037137 A CN 201911037137A CN 110748549 B CN110748549 B CN 110748549B
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- China
- Prior art keywords
- hole
- grating sensor
- fiber grating
- rectangular
- gasket
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 13
- 239000000835 fiber Substances 0.000 claims description 42
- 239000012634 fragment Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 2
- 239000013307 optical fiber Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 12
- 239000000428 dust Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B43/00—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
- G01L5/243—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed using washers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4439—Auxiliary devices
- G02B6/4459—Ducts; Conduits; Hollow tubes for air blown fibres
Abstract
The invention belongs to the technical field of fastener detection, and particularly relates to an intelligent gasket for monitoring pretightening force. The invention can monitor the bolt pretightening force change and the bolt looseness degree, and has the advantages of high reliability, electromagnetic interference resistance, oil stain resistance, high measurement precision and the like.
Description
Technical Field
The invention relates to the technical field of fastener detection, in particular to an intelligent gasket for monitoring pretightening force.
Background
The bolt connection can generate a large clamping force between connected pieces, is convenient to assemble and disassemble, is easy to realize mass production after standardization, has low cost, low price and interchangeability, and becomes the most extensive connection method in the assembly of a plurality of industrial products. The most fundamental purpose of bolt connection is to generate reliable clamping force between connected parts, namely, the internal pretightening force of the bolt, the pretightening force control of the bolt connection directly influences the assembly quality and reliability of the whole product, the bolt is easy to lose efficacy if the pretightening force is too large, and the bolt is easy to loosen if the pretightening force is not enough.
However, the bolt connection pretightening force is difficult to be directly monitored and controlled in the tightening process, the bolt connection pretightening force is often controlled by indirect methods such as a torque method and a corner method in the engineering, so as to achieve the aim of fastening, the most common screwing method applied in the current engineering is a torque method, so that the control of the screwing quality of the bolt depends excessively on the screwing torque, however, the tightening torque of the bolt is affected by the machining accuracy of the bolt, the friction force on the surfaces of the thread pair, the final residual clamping force of each bolt is different, in practical engineering application, the bolt connection in mechanical assembly is often a group of a plurality of bolts, the control of the pretightening force in the connection of the bolt group is more difficult, and if the residual clamping force of each bolt is to be monitored, the intelligent gasket for monitoring the pretightening force is provided.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an intelligent gasket for monitoring pretightening force.
In order to achieve the purpose, the invention adopts the following technical scheme: an intelligent gasket for monitoring pretightening force, which comprises a gasket body, a rectangular through hole, a threaded hole, a set screw and a stress mechanism, the rectangular through hole is arranged on the gasket body, the threaded hole is arranged at the top of the gasket body, the threaded hole is communicated with the rectangular through hole, the positioning screw is arranged in the threaded hole in a threaded manner, the stress mechanism is arranged in the rectangular through hole and comprises an elastic sheet, a groove, a fiber bragg grating sensor and two sliding sheets, the elastic sheet is arranged in the rectangular through hole, the groove is arranged at the top of the elastic sheet, the bottom end of the positioning screw extends into the groove and is contacted with the inner wall of the bottom of the groove, the fiber grating sensor is fixedly installed on the elastic sheet, the two sliding sheets are fixedly installed at the bottom of the elastic sheet, and the two sliding sheets are connected with the inner wall of the bottom of the rectangular through hole in a sliding mode.
Preferably, the top of the positioning screw is provided with an inner hexagonal groove.
Preferably, the bottom of the elastic sheet is provided with two through holes with the bottoms being open, and the fiber grating sensor sequentially penetrates through the two through holes and is fixedly connected with the inner walls of the two through holes.
Preferably, a first plug and a second plug are fixedly mounted on the inner wall of the rectangular through hole, the first plug and the second plug are respectively located on two sides of the elastic piece, a protection tube is fixedly mounted on the second plug, an optical fiber pigtail cable is fixedly mounted in the protection tube, one end of the optical fiber pigtail cable extends into the rectangular through hole and is fixedly connected with the optical fiber grating sensor, and the other end of the optical fiber grating sensor extends to the outside of the gasket body.
Preferably, the outer wall of the fiber grating sensor is fixedly sleeved with two connecting blocks, and the two connecting blocks are fixedly connected with the inner wall of the through hole correspondingly.
Compared with the prior art, the invention has the beneficial effects that: through the matching of the positioning screw, the threaded hole, the elastic sheet, the groove, the inner hexagonal groove, the fiber grating sensor, the slip sheet and the through hole, the positioning screw can be rotated clockwise through an inner hexagonal wrench, the initial stress of the fiber grating sensor can be preset, when the nut is locked with the bolt in practical use, the gasket body is subjected to axial pressure along the direction of the bolt, the gasket body can generate certain deformation and drive the fiber grating sensor to deform and stretch, so that the wavelength of the fiber grating sensor is changed, after the fiber grating sensor can be connected with an optical fiber sensing analyzer through an optical fiber pigtail cable, the wavelength value of the fiber grating sensor can be demodulated, the wavelength variation quantity is calculated according to the initial wavelength value, the pressure on the gasket body is calculated according to the corresponding relation between the physical quantity and the wavelength variation, and the pre-tightening force on the bolt is further obtained, the measurement precision is high;
the first plug, the second plug and the protection tube are matched, the first plug and the second plug seal the rectangular through hole, dust and oil dirt in the outside air can be prevented from being impregnated into a stress mechanism, the protection tube can protect the optical fiber tail cable, abrasion of the optical fiber tail cable is avoided, the optical fiber grating sensor can be effectively prevented from being dragged in the dragging process, and the protection performance is good;
the invention can monitor the bolt pretightening force change and the bolt looseness degree, and has the advantages of high reliability, electromagnetic interference resistance, oil stain resistance, high measurement precision and the like.
Drawings
FIG. 1 is a top view of the present invention;
FIG. 2 is a front cross-sectional view of the present invention;
FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2;
FIG. 4 is an enlarged view of the structure at B of FIG. 2;
FIG. 5 is a left side cross-sectional view of the spacer body shown in FIG. 1;
fig. 6 is a perspective view of the first plug of the present invention.
In the figure: 1. a spacer body; 2. a rectangular through hole; 3. a threaded hole; 4. a set screw; 5. a spring plate; 6. a groove; 7. an inner hexagonal groove; 8. a fiber grating sensor; 9. sliding blades; 10. a port; 11. a first plug; 12. a second plug; 13. protecting the tube; 14. and (4) a fiber optic pigtail cable.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to fig. 6, the present invention provides a technical solution: an intelligent gasket for monitoring pretightening force comprises a gasket body 1, a rectangular through hole 2, a threaded hole 3, a set screw 4 and a stress mechanism, wherein the rectangular through hole 2 is arranged on the gasket body 1, the threaded hole 3 is arranged at the top of the gasket body 1, the threaded hole 3 is communicated with the rectangular through hole 2, the positioning screw 4 is installed in the threaded hole 3 in a threaded manner, the stress mechanism is arranged in the rectangular through hole 2 and comprises an elastic sheet 5, a groove 6, a fiber grating sensor 8 and two sliding sheets 9, the elastic sheet 5 is arranged in the rectangular through hole 2, the groove 6 is formed in the top of the elastic sheet 5, the bottom end of the positioning screw 4 extends into the groove 6 and is in contact with the inner wall of the bottom of the groove 6, the fiber grating sensor 8 is fixedly installed on the elastic sheet 5, the two sliding sheets 9 are fixedly installed at the bottom of the elastic sheet 5, and the two sliding sheets 9 are both in sliding connection with the inner wall of the bottom of;
the top of the set screw 4 is provided with an inner hexagonal groove 7, the bottom of the elastic sheet 5 is provided with two openings 10 with the bottoms being open, the fiber grating sensor 8 sequentially penetrates through the two openings 10 and is fixedly connected with the inner walls of the two openings 10, the inner wall of the rectangular through hole 2 is fixedly provided with a first plug 11 and a second plug 12, the first plug 11 and the second plug 12 are respectively positioned at two sides of the elastic sheet 5, the second plug 12 is fixedly provided with a protection tube 13, the protection tube 13 is internally and fixedly provided with a fiber pigtail cable 14, one end of the fiber pigtail cable 14 extends into the rectangular through hole 2 and is fixedly connected with the fiber grating sensor 8, the other end of the fiber grating sensor 8 extends out of the gasket body 1, the outer wall of the fiber grating sensor 8 is fixedly provided with two connecting blocks, the two connecting blocks are both fixedly connected with the inner walls of the corresponding openings 10, The threaded hole 3, the spring plate 5, the groove 6, the inner hexagonal groove 7, the fiber grating sensor 8, the slip sheet 9 and the through hole 10 are matched, the positioning screw 4 can be rotated clockwise through an inner hexagonal wrench, the initial stress of the fiber grating sensor 8 can be preset, when the nut is locked with the bolt in actual use, the gasket body 1 is subjected to axial pressure along the bolt direction, the gasket body 1 can generate certain deformation to drive the fiber grating sensor 8 to deform and stretch, so that the wavelength of the fiber grating sensor 8 is changed, after the fiber grating sensor 8 can be connected with an optical fiber sensing analyzer through the fiber pigtail cable 14, the wavelength value of the fiber grating sensor 8 can be demodulated, the wavelength variation can be calculated according to the initial wavelength value, the pressure on the gasket body 1 can be calculated according to the corresponding relation between the physical quantity and the wavelength variation, and the pre-tightening force on the bolt can be further obtained, the measurement precision is high; the first plug 11 and the second plug 12 are matched with the protection pipe 13, the first plug 11 and the second plug 12 seal the rectangular through hole 2, so that dust and oil dirt in the external air can be prevented from being impregnated into a stress mechanism, the protection pipe 13 can protect the optical fiber pigtail cable 14, abrasion of the optical fiber pigtail cable can be avoided, the optical fiber grating sensor 8 can be effectively prevented from being dragged in the dragging process, and the protection performance is good; the invention can monitor the bolt pretightening force change and the bolt looseness degree, and has the advantages of high reliability, electromagnetic interference resistance, oil stain resistance, high measurement precision and the like.
In this embodiment: the top end of the set screw 4 is not higher than the top plane of the gasket body 1;
the positioning screw 4 can be rotated clockwise by inserting an inner hexagonal wrench into the inner hexagonal groove 7, the positioning screw 4 can move downwards in the clockwise rotation process, so that the elastic sheet 5 can be pushed to deform, two sliding sheets 9 at the bottom of the elastic sheet 5 can move backwards, the part of the fiber grating sensor 8, which is positioned between two through holes 10, can be tightened and deformed to a certain extent, and thus the presetting of the initial stress of the fiber grating sensor 8 can be completed;
when the device is actually used, the gasket can replace a traditional gasket used when a bolt and a nut are fastened, when the nut and the bolt are locked, the gasket body 1 is axially pressed along the direction of the bolt, the gasket body 1 can deform to a certain degree after being pressed, the elastic sheet 5 can deform to drive the fiber grating sensor 8 to deform and stretch after being pressed, so that the wavelength of the fiber grating sensor 8 changes, the fiber grating sensor can be connected with an optical fiber sensing analyzer through the fiber pigtail cable 14, the wavelength value of the fiber grating sensor 8 can be demodulated, the wavelength variation can be calculated according to the initial wavelength value, the pressure applied to the gasket body 1 can be calculated according to the corresponding relation between the physical quantity and the wavelength variation, and the pre-tightening force applied to the bolt can be further obtained;
the rectangular through hole 2 is sealed by the first plug 11 and the second plug 12, so that the stress mechanism can be prevented from being contaminated by dust and oil dirt in the outside air, the optical fiber pigtail cable 14 can be protected by the protection tube 13, the optical fiber pigtail cable is prevented from being damaged due to friction with the edge of the rectangular through hole 2 in the using process, and the optical fiber grating sensor 8 can be effectively prevented from being pulled in the pulling process.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The utility model provides an intelligent gasket of pretightning force monitoring, includes gasket body (1), rectangle through-hole (2), screw hole (3), set screw (4) and atress mechanism, its characterized in that: the rectangular through hole (2) is formed in the gasket body (1), the threaded hole (3) is formed in the top of the gasket body (1), the threaded hole (3) is communicated with the rectangular through hole (2), the positioning screw (4) is installed in the threaded hole (3) in a threaded mode, the stress mechanism is arranged in the rectangular through hole (2) and comprises an elastic sheet (5), a groove (6), a fiber grating sensor (8) and two sliding sheets (9), the elastic sheet (5) is arranged in the rectangular through hole (2), the groove (6) is formed in the top of the elastic sheet (5), the bottom end of the positioning screw (4) extends into the groove (6) and is in contact with the inner wall of the bottom of the groove (6), and the fiber grating sensor (8) is fixedly installed on the elastic sheet (5), the two sliding pieces (9) are fixedly installed at the bottom of the elastic piece (5), and the two sliding pieces (9) are connected with the inner wall of the bottom of the rectangular through hole (2) in a sliding mode.
2. The intelligent gasket for monitoring pretightening force according to claim 1, wherein: the top of the positioning screw (4) is provided with an inner hexagonal groove (7).
3. The intelligent gasket for monitoring pretightening force according to claim 2, wherein: two openings (10) with openings at the bottoms are formed in the bottom of the elastic sheet (5), and the fiber grating sensor (8) sequentially penetrates through the two openings (10) and is fixedly connected with the inner walls of the two openings (10).
4. The intelligent gasket for monitoring pretightening force according to claim 2, wherein: fixed mounting has first end cap (11) and second end cap (12) on the inner wall of rectangle through-hole (2), first end cap (11) and second end cap (12) are located respectively the both sides of shell fragment (5), fixed mounting has protection tube (13) on second end cap (12), fixed mounting has optic fibre pigtail cable (14) in protection tube (13), the one end of optic fibre pigtail cable (14) extends to in rectangle through-hole (2) and with fiber grating sensor (8) fixed connection, the other end of fiber grating sensor (8) extends to outside the gasket body (1).
5. The intelligent gasket for monitoring pretightening force according to claim 3, wherein: the outer wall of the fiber grating sensor (8) is fixedly sleeved with two connecting blocks, and the two connecting blocks are fixedly connected with the inner wall of the through hole (10) correspondingly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911037137.3A CN110748549B (en) | 2019-10-29 | 2019-10-29 | Intelligent gasket of pretightning force monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911037137.3A CN110748549B (en) | 2019-10-29 | 2019-10-29 | Intelligent gasket of pretightning force monitoring |
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| Publication Number | Publication Date |
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| CN110748549A CN110748549A (en) | 2020-02-04 |
| CN110748549B true CN110748549B (en) | 2021-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911037137.3A Active CN110748549B (en) | 2019-10-29 | 2019-10-29 | Intelligent gasket of pretightning force monitoring |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114893492B (en) * | 2022-03-28 | 2023-08-11 | 南京理工大学 | A intelligent gasket for real-time supervision bolt pretightning force changes |
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|---|---|---|---|---|
| DE10236051A1 (en) * | 2002-08-06 | 2004-02-19 | Eads Deutschland Gmbh | Strain or deformation sensor for continuous monitoring of strain or deformation, particularly of a tightened bolt, has a pressure dependent passive resonant circuit the deformation of which, causes a change in resonant frequency |
| CN204346467U (en) * | 2015-01-19 | 2015-05-20 | 西安科技大学 | A kind of fiber-optic grating sensor prestress loading adjusting device |
| CN104964713A (en) * | 2015-07-09 | 2015-10-07 | 河南蓝信科技股份有限公司 | Fiber bragg grating stress, strain and temperature measuring bolt |
| CN105403337A (en) * | 2015-11-02 | 2016-03-16 | 武汉理工大学 | Fiber grating bolt stress sensor with pre-stretching device |
| CN206943194U (en) * | 2017-06-30 | 2018-01-30 | 大连理工大学 | A kind of intelligent gasket device for being used for monitoring bolt loosening based on fiber grating |
| 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 |
| CN210180581U (en) * | 2019-09-06 | 2020-03-24 | 四川拜安科技有限公司 | Contact force sensor with pretightening force loss threshold alarm and overload protection functions |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101812326B1 (en) * | 2011-08-30 | 2017-12-26 | 주식회사 필룩스 | Washer and power supplied illumination device through washer |
-
2019
- 2019-10-29 CN CN201911037137.3A patent/CN110748549B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10236051A1 (en) * | 2002-08-06 | 2004-02-19 | Eads Deutschland Gmbh | Strain or deformation sensor for continuous monitoring of strain or deformation, particularly of a tightened bolt, has a pressure dependent passive resonant circuit the deformation of which, causes a change in resonant frequency |
| CN204346467U (en) * | 2015-01-19 | 2015-05-20 | 西安科技大学 | A kind of fiber-optic grating sensor prestress loading adjusting device |
| CN104964713A (en) * | 2015-07-09 | 2015-10-07 | 河南蓝信科技股份有限公司 | Fiber bragg grating stress, strain and temperature measuring bolt |
| CN105403337A (en) * | 2015-11-02 | 2016-03-16 | 武汉理工大学 | Fiber grating bolt stress sensor with pre-stretching device |
| CN206943194U (en) * | 2017-06-30 | 2018-01-30 | 大连理工大学 | A kind of intelligent gasket device for being used for monitoring bolt loosening based on fiber grating |
| 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 |
| CN210180581U (en) * | 2019-09-06 | 2020-03-24 | 四川拜安科技有限公司 | Contact force sensor with pretightening force loss threshold alarm and overload protection functions |
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| CN110748549A (en) | 2020-02-04 |
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