CN210180581U - Contact force sensor with pretightening force loss threshold alarm and overload protection functions - Google Patents
Contact force sensor with pretightening force loss threshold alarm and overload protection functions Download PDFInfo
- Publication number
- CN210180581U CN210180581U CN201921477843.5U CN201921477843U CN210180581U CN 210180581 U CN210180581 U CN 210180581U CN 201921477843 U CN201921477843 U CN 201921477843U CN 210180581 U CN210180581 U CN 210180581U
- Authority
- CN
- China
- Prior art keywords
- mounting hole
- optical
- overload protection
- flat pad
- loss threshold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model belongs to the technical field of light sensing, especially, be a contact force sensor with pretightning force loss threshold is reported to police and overload protection function, establish flat pad and photoelectric demodulation appearance on the bolt including the cover, the mounting hole has been seted up on the flat pad, and fixed mounting has two end caps in the mounting hole, and outside one side that two end caps kept away from each other all extended to the mounting hole, was equipped with the shell fragment in the mounting hole, the bottom of shell fragment and the bottom inner wall sliding connection of mounting hole, and the shell fragment is located between two end caps, and fixed mounting has fiber grating on the shell fragment. The utility model discloses simple structure, convenient to use, through install fiber grating and shell fragment and cooperation photoelectric demodulator in flat pad, and then can the effectual size of the axial pretightning force that detects the bolt to the realization is to the accurate on-line monitoring of remote equipment bolt pretightning force, labour saving and time saving avoids the bolt pretightning force to reduce or transship and arouses the bolt fracture, guarantees the safe operation of equipment.
Description
Technical Field
The utility model relates to a light sensing technical field especially relates to a contact force sensor with pretightning force loss threshold is reported to police and overload protection function.
Background
The position and displacement force measurement has wide requirements in engineering technology and daily life, and has wide market. The most familiar scale is the scale, which is the most typical position displacement force measuring technology, and the weight position and distance force information is obtained by reading the comparison with the scale marks or displayed numbers of the scale of the scale. In order to meet the measurement requirements of different specific positions, displacements, distance forces, gravity and contact forces, various advanced displacement force measurement sensors are generated, and part of the sensors can also finish automatic and non-contact force and distance measurement, such as laser ranging, ultrasonic ranging, photoelectric imaging, optical code disc electronic scales, force sensors, balance and the like. At present, large-scale equipment is basically installed through bolts, the bolts are under the action of pretightening force and dynamic load, the action of bearing cyclic alternating tensile force leads to the fact that threads are subjected to plastic deformation and lead to loosening, the pretightening force of the bolts is reduced, when the pretightening force is reduced to a certain degree, the friction torque generated at the meshing parts of the bolts cannot be overcome, the final pretightening force disappears, an effective connection effect cannot be achieved, the bolts are easy to break under the condition of bearing large load, the pretightening force of the bolts is reduced and overloaded, great danger is caused to equipment at the bolt connection parts, and therefore in order to prevent the reduction or disappearance of the pretightening force of the bolts, the pretightening force of.
However, in the prior art, a torque wrench is generally used manually to periodically check bolt pretightening force, when operation and maintenance are far away or in a special area, the periodic check operation and maintenance strategy of the bolt pretightening force is generally performed once in half a year or a year, online monitoring cannot be performed, time and labor are wasted, and in addition, the operation and maintenance can not accurately find and eliminate the problem of bolt looseness or overload every time due to multi-factor influence in subjective and objective aspects of workers, so that a contact force sensor with pretightening force loss threshold alarm and overload protection functions is provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the shortcoming that exists among the prior art, and the contact force sensor who has pretightning force loss threshold warning and overload protection function that proposes.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a contact force sensor with pretightening force loss threshold alarm and overload protection functions comprises a flat pad and a photoelectric demodulator, wherein the flat pad is sleeved on a bolt, a mounting hole is formed in the flat pad, two plugs are fixedly mounted in the mounting hole, the sides, far away from each other, of the two plugs extend out of the mounting hole, a spring plate is arranged in the mounting hole, the bottom of the spring plate is in sliding connection with the inner wall of the bottom of the mounting hole, the spring plate is positioned between the two plugs, a fiber bragg grating is fixedly mounted on the spring plate and is matched with the spring plate, a screw is mounted on the flat pad in a threaded manner, the bottom end of the screw extends into the mounting hole and is in contact with the top of the spring plate, an optical cable fixing part is fixedly mounted on one side, positioned outside the flat pad, of one plug, a transmission optical cable penetrates through the optical cable fixing part and the corresponding plug, one end of the transmission optical cable far away from the flat pad is connected with the photoelectric demodulator.
Preferably, the photoelectric demodulator comprises a CPU, a photoelectric detection module, a wavelength scanning laser, an electrical signal processing module, an optical isolator and an optical coupler, wherein the wavelength scanning laser and the electrical signal processing module are connected to the CPU, the photoelectric detection module is connected to the electrical signal processing module, the optical isolator is connected to the wavelength scanning laser, the optical coupler is connected to the optical isolator, the photoelectric detection module is connected to the optical coupler, and the optical coupler is connected to the fiber bragg grating through a transmission cable.
Preferably, the shell fragment is domes, and first through-hole has all been seted up at the both ends of shell fragment, and equal fixed mounting has a fixed block in two first through-holes, and fiber grating fixed mounting is on two fixed blocks, and corresponding fixed block is run through respectively at fiber grating's both ends, and fiber grating is located the screw under.
Preferably, the top end of the elastic sheet is provided with a clamping groove, the bottom end of the screw extends into the clamping groove and is in contact with the inner wall of the bottom of the clamping groove, and the screw is matched with the clamping groove.
Preferably, the inner wall of the top of the mounting hole is provided with a threaded through hole, and the screw is mounted in the threaded through hole in a threaded manner.
Preferably, the plug and the optical cable fixing piece are made of rubber.
Compared with the prior art, the beneficial effects of the utility model are that: firstly, the CPU of the photoelectric demodulator, the photoelectric detection module, the wavelength scanning laser, the electric signal processing module, the optical isolator and the optical coupler are matched, so that optical scanning on the fiber bragg grating can be realized, reflected spectrum signals can be collected, the wavelength variation of the signals can be analyzed, the bolt pretightening force can be judged, the detection on the bolt pretightening force can be realized through the matching of the elastic sheet, the flat pad, the transmission optical cable, the screw and the fiber bragg grating, the axial force borne by the flat pad can be converted into the radial microstrain of the fiber bragg grating, and the change of the scanning optical signals can be realized and reflected to the photoelectric demodulator.
The utility model discloses simple structure, convenient to use, through install fiber grating and shell fragment and cooperation photoelectric demodulator in flat pad, and then can the effectual size of the axial pretightning force that detects the bolt to the realization is to the accurate on-line monitoring of remote equipment bolt pretightning force, labour saving and time saving avoids the bolt pretightning force to reduce or transship and arouses the bolt fracture, guarantees the safe operation of equipment.
Drawings
FIG. 1 is a schematic sectional view of the front view of the present invention;
fig. 2 is a schematic top view of the present invention;
FIG. 3 is an enlarged schematic view of portion A of FIG. 1;
fig. 4 is a schematic block diagram of the middle photoelectric demodulator of the present invention.
In the figure: 1. flattening the cushion; 2. a plug; 3. a spring plate; 4. a fiber grating; 5. a screw; 6. an optical cable mount; 7. a transmission optical cable.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: a contact force sensor with pretightening force loss threshold alarm and overload protection functions comprises a flat pad 1 and a photoelectric demodulator, wherein the flat pad 1 is sleeved on a bolt, a mounting hole is formed in the flat pad 1, two plugs 2 are fixedly mounted in the mounting hole, the sides, far away from each other, of the two plugs 2 extend out of the mounting hole, an elastic sheet 3 is arranged in the mounting hole, the bottom of the elastic sheet 3 is in sliding connection with the inner wall of the bottom of the mounting hole, the elastic sheet 3 is positioned between the two plugs 2, an optical fiber grating 4 is fixedly mounted on the elastic sheet 3, the optical fiber grating 4 is matched with the elastic sheet 3, a screw 5 is arranged on the flat pad 1 in a threaded manner, the bottom end of the screw 5 extends into the mounting hole and is in contact with the top of the elastic sheet 3, an optical cable fixing piece 6 is fixedly mounted on one side, positioned outside the flat pad 1, of one plug 2, the optical fiber of the transmission optical cable 7 extends into the mounting hole and is welded with one end of the fiber bragg grating 4, and one end of the transmission optical cable 7, which is far away from the flat pad 1, is connected with the photoelectric demodulator;
the photoelectric demodulator comprises a CPU, a photoelectric detection module, a wavelength scanning laser, an electric signal processing module, an optical isolator and an optical coupler, wherein the wavelength scanning laser and the electric signal processing module are connected with the CPU, the photoelectric detection module is connected with the electric signal processing module, the optical isolator is connected with the wavelength scanning laser, the optical coupler is connected with the optical isolator, the photoelectric detection module is connected with the optical coupler, the optical coupler is connected with an optical fiber grating 4 through a transmission optical cable 7, the photoelectric demodulator realizes the sending of a multi-wavelength optical signal, the receiving of a multi-wavelength reflection signal and the decoding of position coding signal wavelength information, the wavelength scanning optical signal is generated by the wavelength scanning laser, the wavelength division multiplexing WDM coding optical signal of the photoelectric demodulator is provided by a broadband light source, an optical fiber wavelength division demultiplexer is adopted to decompose the WDM optical signal into different channels, and each channel is provided with the photoelectric detection module, the multi-channel simultaneous demodulation can be connected with a plurality of fiber gratings 4 through optical fibers, switching is carried out by adopting an optical fiber switch, a photoelectric demodulator is shared, a sensing system for detecting the absolute position pretightening force of the optical fibers of the multi-position sensing head is jointly formed, each elastic sheet 3 is of an arch structure, first through holes are formed in two ends of each elastic sheet 3, fixed blocks are fixedly arranged in the two first through holes, the fiber gratings 4 are fixedly arranged on the two fixed blocks, the two ends of each fiber grating 4 respectively penetrate through the corresponding fixed blocks, the fiber gratings 4 are positioned under screws 5, the flat pad 1 is arranged in each elastic sheet 3 and each fiber grating 4, the elastic sheets 3 sense axial strain and radially pull the fiber gratings 4, the axial strain is in direct proportion to the axial force, the fiber gratings 4 are pulled to cause spectral wavelength change and react to the photoelectric demodulator, so that the detection of the magnitude of the axial force is realized, clamping grooves are formed, the bottom of screw 5 extends to in the draw-in groove and with the bottom inner wall contact of draw-in groove, screw and draw-in groove looks adaptation have seted up the screw thread through-hole on the top inner wall of mounting hole, and 5 screw threads of screw are installed in the screw thread through-hole, and the material of end cap 2 and optical cable mounting 6 is rubber.
The working principle is as follows: when the device is used, the pretightening force of the bolt is reduced or overloaded, the pressure at the top end of the screw 5 is reduced or increased, the screw 5 moves upwards or downwards under the action of the elastic sheet 3, the elastic sheet 3 contracts or extends, the pulling force on the fiber bragg grating 4 is reduced or increased, the wavelength of the narrow band output by the wavelength scanning laser of the photoelectric demodulator is monotonously changed along with time under the drive of the scanning drive voltage, the wavelength scanning is realized, the wavelength scanning optical signal emitted by the wavelength scanning laser enters the fiber bragg grating 4 through the optical isolator, the optical coupler and the transmission optical cable 7, the fiber bragg grating 4 generates microstrain, so that the spectral wavelength is changed and reflects the optical signal, the reflected optical signal is transmitted to the optical coupler through the transmission optical cable 7 and is detected by the photoelectric detection module to be the reflected optical signal (wavelength variation), and the photoelectric detector can obtain the reflected spectrum with high light intensity after each, The difference of the intensity of the light intensity and the weak combination corresponding to different wavelengths in the group of reflection type spectrum signals contains information of the single-channel contact force sensor, and each parameter of the contact force sensor is set and stored in the photoelectric demodulator, so that the contact force is read out, whether the pretightening force of the bolt is reduced to a threshold value or is overloaded is judged, and the pretightening force loss threshold alarm or the overload alarm is carried out.
It should be noted that the device structure and the accompanying drawings of the present invention mainly describe the principle of the present invention, and in the technology of this design principle, the settings of the power mechanism, the power supply system, the control system, etc. of the device are not completely described, and the details of the power mechanism, the power supply system, and the control system can be clearly known on the premise that those skilled in the art understand the principle of the present invention.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. The utility model provides a contact force sensor with pretightning force loss threshold is reported to police and overload protection function, establishes flat pad (1) and photoelectric demodulator on the bolt including the cover, its characterized in that: the flat pad (1) is provided with a mounting hole, two plugs (2) are fixedly mounted in the mounting hole, one sides, far away from each other, of the two plugs (2) extend out of the mounting hole, an elastic sheet (3) is arranged in the mounting hole, the bottom of the elastic sheet (3) is in sliding connection with the inner wall of the bottom of the mounting hole, the elastic sheet (3) is located between the two plugs (2), an optical fiber grating (4) is fixedly mounted on the elastic sheet (3), the optical fiber grating (4) is matched with the elastic sheet (3), a screw (5) is mounted on the flat pad (1) in a threaded manner, the bottom end of the screw (5) extends into the mounting hole and is in contact with the top of the elastic sheet (3), an optical cable fixing piece (6) is fixedly mounted on one side, located outside the flat pad (1), of one of the plugs (2), a transmission optical cable (7) penetrates through the optical cable fixing piece (6), the optical fiber of the transmission optical cable (7) extends into the mounting hole and is connected with one end of the fiber bragg grating (4), and one end, far away from the flat pad (1), of the transmission optical cable (7) is connected with the photoelectric demodulator.
2. The contact force sensor with pretension loss threshold alarm and overload protection functions according to claim 1, wherein: the photoelectric demodulator comprises a CPU, a photoelectric detection module, a wavelength scanning laser, an electric signal processing module, an optical isolator and an optical coupler, wherein the wavelength scanning laser and the electric signal processing module are connected with the CPU, the photoelectric detection module is connected with the electric signal processing module, the optical isolator is connected with the wavelength scanning laser, the optical coupler is connected with the optical isolator, the photoelectric detection module is connected with the optical coupler, the optical coupler is connected with a fiber grating (4) through a transmission optical cable (7), and the photoelectric detection module is a photoelectric detection module.
3. The contact force sensor with pretension loss threshold alarm and overload protection functions according to claim 1, wherein: the elastic piece (3) is of an arch structure, first through holes are formed in the two ends of the elastic piece (3), fixed blocks are fixedly mounted in the two first through holes, the fiber bragg gratings (4) are fixedly mounted on the two fixed blocks, the two ends of the fiber bragg gratings (4) penetrate through the corresponding fixed blocks respectively, and the fiber bragg gratings (4) are located under the screws (5).
4. The contact force sensor with pretension loss threshold alarm and overload protection functions according to claim 1, wherein: the top end of the elastic sheet (3) is provided with a clamping groove, the bottom end of the screw (5) extends into the clamping groove and is in contact with the inner wall of the bottom of the clamping groove, and the screw is matched with the clamping groove.
5. The contact force sensor with pretension loss threshold alarm and overload protection functions according to claim 1, wherein: the inner wall of the top of the mounting hole is provided with a threaded through hole, and a screw (5) is installed in the threaded through hole in a threaded mode.
6. The contact force sensor with pretension loss threshold alarm and overload protection functions according to claim 1, wherein: the plug (2) and the optical cable fixing piece (6) are made of rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921477843.5U CN210180581U (en) | 2019-09-06 | 2019-09-06 | Contact force sensor with pretightening force loss threshold alarm and overload protection functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921477843.5U CN210180581U (en) | 2019-09-06 | 2019-09-06 | Contact force sensor with pretightening force loss threshold alarm and overload protection functions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210180581U true CN210180581U (en) | 2020-03-24 |
Family
ID=69842918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921477843.5U Active CN210180581U (en) | 2019-09-06 | 2019-09-06 | Contact force sensor with pretightening force loss threshold alarm and overload protection functions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210180581U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110748549A (en) * | 2019-10-29 | 2020-02-04 | 四川拜安科技有限公司 | Intelligent gasket of pretightning force monitoring |
| CN114739560A (en) * | 2022-03-10 | 2022-07-12 | 深圳市风行太保科技有限公司 | Fastening device, threaded fastener monitoring method, device, system and storage medium |
-
2019
- 2019-09-06 CN CN201921477843.5U patent/CN210180581U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110748549A (en) * | 2019-10-29 | 2020-02-04 | 四川拜安科技有限公司 | Intelligent gasket of pretightning force monitoring |
| CN110748549B (en) * | 2019-10-29 | 2021-03-16 | 四川拜安科技有限公司 | Intelligent gasket of pretightning force monitoring |
| CN114739560A (en) * | 2022-03-10 | 2022-07-12 | 深圳市风行太保科技有限公司 | Fastening device, threaded fastener monitoring method, device, system and storage medium |
| CN114739560B (en) * | 2022-03-10 | 2024-02-27 | 深圳市风行太保科技有限公司 | Fastening device, threaded fastener monitoring method, device, system and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210180581U (en) | Contact force sensor with pretightening force loss threshold alarm and overload protection functions | |
| CN103323157B (en) | Dynamic monitoring method and device of stress sensitization fiber bragg grating of locking rods of railway turnout switch machine | |
| KR101280922B1 (en) | Fiber optic sensor apparatus | |
| CN108267250A (en) | A kind of shield hobboing cutter stress on-Line Monitor Device based on fiber-optic grating sensor | |
| EP3462216B1 (en) | Optoelectronic sensor having plug-in unit for providing extended functionality | |
| CN201903411U (en) | Power equipment temperature online monitoring system based on fiber bragg grating temperature sensor | |
| CN114341606A (en) | Method and system for determining braking torque by detection performed by a photonic sensor at a fixed joint between a braking caliper body and a respective support | |
| CN113008149A (en) | Looseness monitoring device and system for bolt or nut | |
| CN112459972A (en) | Wind driven generator main bearing state monitoring device and monitoring method thereof | |
| CN101694372A (en) | Intelligent cable fiber grating strain sensor | |
| CN111847174B (en) | Traction sheave wear degree monitoring device and method thereof | |
| CN215328547U (en) | Yarn detection system and device of chenille equipment | |
| CN101936792A (en) | Fibre bragg grating negative pressure sensor for mine | |
| CN206594075U (en) | A kind of tunnel double-lining carbon coated optical fiber distress in concrete monitoring system | |
| CN204897066U (en) | Automatic escalator safety control system based on two dimension laser sensor | |
| CN214845766U (en) | Carbon brush wear detection device and intelligent carbon brush | |
| CN212181593U (en) | Optical fiber alarm device | |
| CN213171019U (en) | Fiber grating array detection device for strain of outdoor independent elevator steel frame structure | |
| CN212807355U (en) | C-shaped temperature measuring wire clamp | |
| CN210293248U (en) | Cable hot spot multi-professional sharing monitoring device based on single-mode optical cable | |
| CN111855046A (en) | Optical fiber force measurement monitoring system | |
| CN215114625U (en) | Bridge cable health diagnosis on-line monitoring system based on fiber grating sensor | |
| CN214748562U (en) | Anchor rod axial force sensor | |
| CN201569416U (en) | Intelligent type cable fiber grating strain transducer | |
| CN201852668U (en) | Mining fiber Bragg grating vacuum sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |