CN206709997U - A kind of intelligent bolt for monitoring complicated loads - Google Patents
A kind of intelligent bolt for monitoring complicated loads Download PDFInfo
- Publication number
- CN206709997U CN206709997U CN201720595872.6U CN201720595872U CN206709997U CN 206709997 U CN206709997 U CN 206709997U CN 201720595872 U CN201720595872 U CN 201720595872U CN 206709997 U CN206709997 U CN 206709997U
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- China
- Prior art keywords
- bolt
- section
- strain
- hole
- optical fiber
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- Expired - Fee Related
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 17
- 239000013307 optical fiber Substances 0.000 claims abstract description 24
- 230000000694 effects Effects 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Landscapes
- Length Measuring Devices By Optical Means (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
A kind of intelligent bolt for monitoring complicated loads, belongs to technical field of optical fiber sensing.Intelligent bolt includes shank of bolt axle, through hole and optical fiber, and the position that the shaft section center and shaft section center of shank of bolt axle and shaft section are radially mutually hexagonal angle is provided with through hole, totally 4 through holes, a diameter of 1.5mm of through hole；It is mutually that the distance at 120 ° of 3 through hole to shaft section centers is equal, and is all the half of shank of bolt shaft section radius, pastes fixed optical fiber in through hole length range.Optical fiber is installed in bolt axle center and 3 through holes that radial direction angle is 120 °, bar axle maximum strain section is determined by the Strain Distribution of measurement, the maximum strain in section is obtained based on axle center strain on the section and the radially strain of 3 points, then judges the safe condition in section.Effect and benefit of the present utility model are that by the real-time monitoring under bolt complex stress situation, have the advantages of measurement accuracy is high, and long-time stability are good, structure letter.
Description
Technical Field
The utility model belongs to the technical field of the optical fiber sensing, an intelligent bolt of complicated load effect of monitoring is related to.
Background
With the popularization and application of high-strength steel in construction and bridge engineering, connection failure has become a main factor influencing the safety of steel structures. The performance stability of bolts used as the joints of key components of various engineering structures and mechanical equipment is also receiving increasing attention. In practical engineering, the damage of the bolt is generally caused by the fact that the tensile stress generated by the cross section edge of the bolt shaft exceeds the limit stress. This is due to the fact that the bending moment, shear force and axial force on the components are transmitted to the bolt, which causes the bolt to undergo large bending deformation, and finally the bolt exceeds its own load-bearing capacity and fails. Therefore, the stress state of the bolt in a complex stress state is monitored, and the method has great significance for the safety of a steel structure. However, due to the particularity of some components or positions, the safety performance of the bolt per se under a complex stress working state is difficult to monitor. At present, the research on monitoring and measuring the stress of the bolt in China mainly aims at the axial stress of the bolt, and the monitoring of the bolt in a complex stress state is rarely related. The existing patent CN104964713A about bolt stress monitoring can measure the tensile and compressive strain of the axle center of the bolt, but the measuring method is only suitable for the condition that the bolt is under the action of axial load. Under the action of bending moment, the axis of the bolt is the position with the minimum stress of the section of the bolt, and a sensor is arranged on the axis of the bolt and cannot measure the stress and the strain under the condition. Therefore, a method for monitoring the stress of the bolt under the action of complex load needs to be researched.
The optical fiber sensor has the advantages of high sensitivity, electromagnetic interference resistance, corrosion resistance, good long-term working stability, long transmission distance and the like. The method has been successfully applied to safety monitoring in the fields of buildings, bridges and the like in recent years. In order to realize the monitoring of bolt shear stress, the utility model discloses based on a distributing type strain measurement technique, its rationale is: the spectral response change of the back Rayleigh scattering is mainly influenced by strain and temperature, and the change of the Rayleigh scattering of any area in the optical fiber can cause the change of the corresponding back scattering spectrum of the area, and the changes can be calibrated and converted into temperature change and strain. Each section of the fiber can be considered as a sensor, and the entire fiber can be considered as a continuous assembly of individual sensors. The tunable wavelength interference technology adopted by the distributed optical fiber sensing system enables the measurement of distributed temperature and strain to have millimeter-level spatial resolution on a standard optical fiber with dozens of lengths, and the measurement accuracy of the strain and the temperature can reach 1 microstrain and 0.1 ℃.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an intelligent bolt of complicated load effect of monitoring.
The technical scheme of the utility model:
an intelligent bolt for monitoring complex load effect comprises a bolt rod shaft, through holes and optical fibers, wherein the through holes are arranged at the center of an axial section of the bolt rod shaft and the positions of the center of the axial section and the axial section, which form an angle of 120 degrees with each other in the radial direction, and the diameter of each through hole is 1.5 mm; the distances from the 3 through holes forming 120 degrees to the center of the shaft section are equal, the distances are half of the radius of the shaft section of the bolt shaft, and the optical fibers are stuck and fixed in the full-length range of the through holes.
A method for monitoring the complex load effect of an intelligent bolt comprises the following steps:
(1) based on a distributed optical fiber strain measurement system, measuring strain distribution of the center of the cross section of the bolt rod shaft and the positions of 3 through holes forming an angle of 120 degrees with the radial direction of the cross section along the whole length of the bolt rod shaft;
(2) determining the section with the maximum axial strain of the bolt rod shaft through the axial strain distribution of the bolt rod shaft;
(3) for the cross-section where the axial strain is the greatest,
the maximum compressive strain and the maximum tensile strain of the section are respectively obtained;
wherein,0、1、2、3strain values measured by optical fibers in through holes at the center of the cross section of the bolt rod shaft and at 3 through hole positions forming an angle of 120 degrees with the radial direction of the cross section respectively;
(4) and judging whether the stress and the strain of the most dangerous section exceed the ultimate strength of the material or not through the maximum tensile strain and the maximum compressive strain.
The utility model has the advantages that: the intelligent bolt can realize real-time monitoring of the bolt under a complex stress condition, and has the advantages of high measurement precision, good long-term stability and simple structure.
Drawings
FIG. 1 is a view of the position of the optical fibers on a cross section of the bolt shaft.
In the figure: 1 bolt shank shaft; 2, through holes; 3 optical fibers.
Detailed Description
The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings and the technical solutions:
an intelligent bolt for monitoring complex load effect is disclosed, as shown in figure 1, 1 through hole is drilled on the central axis of a bolt rod shaft 1; and 3 through holes are drilled at the 1/2 position of the section radius, and the included angle between each two adjacent through holes and the connecting line of the circle centers is 120 degrees. In order to avoid the bearing capacity of the bolt from being influenced by the overlarge aperture, the aperture of the through hole is 1.5 mm.
And inserting the optical fiber into the through hole, adhering the optical fiber to the center position of the through hole by using an adhesive in a pre-stretched state, and ensuring that the optical fiber is adhered along the whole length of the bolt rod shaft. The adhesive is epoxy resin or acrylate adhesive.
The axial section center of the bolt rod shaft and three position optical fibers which radially form an angle of 120 degrees with the axial section center are respectively numbered as 0#, 1#, 2#, and 3 #. And measuring the strain distribution of the 0#, 1#, 2#, and 3# optical fibers along the axial direction of the bolt rod shaft by using a distributed optical fiber strain measurement system, and determining the section of the bolt rod shaft with the maximum strain based on the axial strain distribution of the bolt rod.
Analyzing the section with the maximum strain to obtain the maximum compressive strain and the maximum tensile strain of the section respectively equal toWherein0、1、2、3The strain measured by the optical fiber in the through hole is 0#, 1#, 2#, and 3# respectively, and the stress state and the safety condition of the bolt can be evaluated by utilizing the maximum strain.
Claims (1)
1. The intelligent bolt for monitoring the complex load effect is characterized by comprising a bolt rod shaft, through holes and optical fibers, wherein the through holes are formed in the center of the axial section of the bolt rod shaft and the positions where the center of the axial section and the axial section form an angle of 120 degrees with each other in the radial direction, the number of the through holes is 4, and the diameter of each through hole is 1.5 mm; the distances from the 3 through holes forming 120 degrees to the center of the shaft section are equal, the distances are half of the radius of the shaft section of the bolt shaft, and the optical fibers are stuck and fixed in the full-length range of the through holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720595872.6U CN206709997U (en) | 2017-05-26 | 2017-05-26 | A kind of intelligent bolt for monitoring complicated loads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720595872.6U CN206709997U (en) | 2017-05-26 | 2017-05-26 | A kind of intelligent bolt for monitoring complicated loads |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206709997U true CN206709997U (en) | 2017-12-05 |
Family
ID=60462753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720595872.6U Expired - Fee Related CN206709997U (en) | 2017-05-26 | 2017-05-26 | A kind of intelligent bolt for monitoring complicated loads |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206709997U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107024306A (en) * | 2017-05-26 | 2017-08-08 | 大连理工大学 | A kind of intelligent bolt and method for monitoring complicated loads |
| CN109990939A (en) * | 2019-05-10 | 2019-07-09 | 南京工程学院 | A kind of device of roller bolt stress in triangulation feed screw nut |
-
2017
- 2017-05-26 CN CN201720595872.6U patent/CN206709997U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107024306A (en) * | 2017-05-26 | 2017-08-08 | 大连理工大学 | A kind of intelligent bolt and method for monitoring complicated loads |
| CN107024306B (en) * | 2017-05-26 | 2023-02-17 | 大连理工大学 | Intelligent bolt and method for monitoring complex load effect |
| CN109990939A (en) * | 2019-05-10 | 2019-07-09 | 南京工程学院 | A kind of device of roller bolt stress in triangulation feed screw nut |
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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: 20171205 Termination date: 20210526 |