CN214095927U - Fiber grating displacement sensor of gear mechanical linkage - Google Patents
Fiber grating displacement sensor of gear mechanical linkage Download PDFInfo
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- CN214095927U CN214095927U CN202120240121.9U CN202120240121U CN214095927U CN 214095927 U CN214095927 U CN 214095927U CN 202120240121 U CN202120240121 U CN 202120240121U CN 214095927 U CN214095927 U CN 214095927U
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Abstract
The utility model discloses a fiber grating displacement sensor of gear mechanical linkage, including sensor housing, displacement measurement telescopic link, branch, bearing, round pin axle, mechanical drive gear, first fiber grating, second fiber grating, first tail optical fiber, second tail optical fiber, slip track, spring, wedge slider, equal strength elastic beam. The gear slide rails are arranged inside the displacement measurement telescopic rod and above the wedge-shaped sliding block and meshed with the mechanical transmission gear, the sliding rail is installed at the bottom of the sensor shell, the wedge-shaped sliding block is installed on the sliding rail, the equal-strength elastic beam is installed on the wedge-shaped sliding block, and the upper surface and the lower surface of the equal-strength elastic beam are symmetrically pasted with the first fiber bragg grating and the second fiber bragg grating respectively. The fiber grating sensor of the utility model has simple, compact and reasonable structure; the defects that the fiber bragg grating is easy to damage and is influenced by temperature are overcome; and a mechanical linkage mode is utilized, so that the measurement result is more accurate and real.
Description
Technical Field
The utility model belongs to the technical field of the optical fiber sensing, a fiber grating displacement sensor of gear mechanical linkage is related to, is applicable to and detects the healthy condition of structure among the civil engineering.
Background
In recent years, the research and application of the fiber grating sensor draw extensive attention, and compared with the traditional sensing measurement technology, the fiber grating sensor is a novel intelligent sensor and has a plurality of obvious advantages. For example, the sensor has the characteristics of strong moisture resistance, corrosion resistance and durability, good reliability, strong anti-interference performance, easy formation of a sensing network and the like, and can work in a severe environment. Fiber grating sensors have gained much attention in the world because of these advantages. Fiber grating sensors are applied to measurement of various physical quantities such as temperature, strain, pressure, displacement, acceleration, flow and the like in the world.
At present, a lot of work is done to fiber grating displacement sensors at home and abroad: the bending elastic beam is adopted to convert the displacement into the strain of the optical fiber grating through the deformation of the beam, the central wavelength of the optical fiber grating is changed due to the compression or the stretching of the optical fiber grating, and the variation of the wavelength and the displacement form a functional relation so as to obtain the actual displacement; the grating is pulled vertically, one end of the grating is fixed, and the other end of the grating is connected to a moving end, but the measuring range of the method is very small (0.6 mm), and the grating is easy to break.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a fiber grating displacement sensor with a mechanical linkage gear.
The utility model provides a fiber grating displacement sensor of gear mechanical linkage, include:
the device comprises a sensor shell, a displacement measurement telescopic rod, a supporting rod, a bearing, a pin shaft, a mechanical transmission gear, a first fiber bragg grating, a second fiber bragg grating, a first tail fiber, a second tail fiber, a sliding rail, a spring, a wedge-shaped sliding block, an equal-strength elastic beam, a cushion block, a protection pipe, a sliding block, a first gear sliding rail and a second gear sliding rail.
The method is characterized in that: the sensor shell of the installation cavity is a sensor installation space, and the displacement sensing assembly is configured in the installation space and is provided with an optical fiber outlet hole; an optical fiber disposed in the sensor through the optical fiber outlet hole; the sensor shell of the installation cavity is used for inputting displacement signals to the fiber bragg grating;
the method is characterized in that: a pin shaft is fixed on one side of the sensor shell, a bearing is sleeved on the pin shaft, and a mechanical transmission gear is sleeved on the bearing;
the method is characterized in that: the sliding track is arranged at the bottom of the sensor shell and is provided with 4 sliding blocks, the wedge-shaped sliding block is assembled with the sliding block through a screw and is arranged on the sliding track to realize sliding, the wedge-shaped sliding block is provided with a first gear sliding rail and is meshed with the mechanical transmission gear, one end of the constant-strength elastic beam is fixed on the cushion block through a screw, the other end of the constant-strength elastic beam is contacted with the fixed supporting rod, and the supporting rod is contacted with the; the pin shaft is vertical to the support rod, and the support rod is vertical to the equal-strength elastic beam;
the method is characterized in that: the upper surface and the lower surface of the equal-strength elastic beam are symmetrically stuck with a first fiber grating and a second fiber grating respectively. The first tail fiber and the second tail fiber are respectively adhered to the upper surface and the lower surface of the equal-strength elastic beam; the first tail fiber is connected with the first fiber bragg grating, and the second tail fiber is connected with the second fiber bragg grating;
the method is characterized in that: a supporting rod is fixed on one side of the mechanical transmission gear, a displacement measuring telescopic rod is fixed on the side surface of the supporting rod, a protection tube is fixed in the sensor shell, a spring is arranged in the protection tube, one end of the displacement measuring telescopic rod is fixed in the protection tube, and a second gear sliding rail is arranged on the side surface of the other end of the displacement measuring telescopic rod and meshed with the mechanical transmission gear;
the method is characterized in that: the displacement measuring telescopic rod penetrates out of the sensor shell; the first tail fiber and the second tail fiber penetrate out of the sensor shell; the support rod is coaxial with the mechanical transmission gear.
The utility model discloses beneficial effect that can produce: by the arrangement of the double fiber bragg gratings and the adoption of the method of combining the fiber bragg gratings and the equal-strength elastic beams, the force caused by displacement is loaded on the equal-strength beams without excessive conversion, and the measurement precision of the displacement sensor is greatly improved; through the arrangement of the wedge block and the spring, the fiber bragg grating displacement meter can measure displacement data more conveniently; the reversing transmission is realized by mechanical transmission of the gears, the space of the sensor is better utilized, the structure is simple, and the use is convenient.
Drawings
Fig. 1 is a schematic view of the main viewing direction of the fiber grating displacement sensor with mechanical linkage of gears.
Detailed Description
The invention is further described with reference to the following description and embodiments in conjunction with the accompanying drawings.
The embodiment discloses a fiber bragg grating displacement sensor with mechanical linkage of a gear, and as shown in fig. 1, the sensor comprises a sensor shell 1, a displacement measurement telescopic rod 2, a support rod 3, a bearing 4, a pin shaft 5, a mechanical transmission gear 6, a first fiber bragg grating 7, a second fiber bragg grating 8, a first tail fiber 9, a second tail fiber 10, a sliding rail 11, a spring 12, a wedge-shaped sliding block 13, an equal-strength elastic beam 14, a cushion block 15, a protection tube 16, a sliding block 17, a first gear sliding rail 18 and a second gear sliding rail 19; the sensor housing 1 is a sensor mounting space and has an optical fiber outlet hole; the optical fiber is configured in the sensor through the optical fiber outlet hole; the displacement sensing assembly is arranged in the installation space and used for inputting displacement signals to the first fiber bragg grating 7 and the second fiber bragg grating 8, and detection equipment connected with the sensor can judge specific numerical values of the displacement signals through wavelength drift amounts of the first fiber bragg grating 7 and the second fiber bragg grating 8, so that displacement detection is realized.
The following detailed description of the vibration sensing assembly in this embodiment is provided with reference to fig. 1:
as shown in fig. 1, the displacement sensing assembly includes: the equal-strength elastic beam 14 is fixed on the cushion block 15, the upper surface and the lower surface of the equal-strength elastic beam are respectively adhered with the first fiber bragg grating 7 and the second fiber bragg grating 8 and are all adhered and packaged on the equal-strength elastic beam 14 for sensing the fiber bragg grating wavelength variable generated by the displacement of the equal-strength elastic beam 14, the fixed cushion block 15 is installed in the sensor shell 1, one end of the equal-strength elastic beam 14 is fixed on the cushion block 15 through a screw, the cushion block 15 is of a boss structure, and the supporting rod 3 is fixed at the other end of the equal-strength elastic beam. The supporting rod 3 is in contact with the side surface of the wedge-shaped sliding block 13, and the supporting rod 3 is perpendicular to the equal-strength elastic beam 14. In addition, the first fiber grating 7 and the second fiber grating 8 can be adhered to the central axis of the equal-strength elastic beam 14 by using a sticky substance which is not limited to epoxy adhesive.
As shown in fig. 1, a through hole is formed in the sensor housing 1 as an optical fiber outlet, wherein the first fiber grating 7 is connected to the first pigtail 9, the second fiber grating 8 is connected to the second pigtail 10, the sensor housing 1 is led out through the optical fiber outlet, and is protected by an armor protection tube, and the armor protection tube can be connected to the sensor housing by means of a screw thread, a bolt, an interference fit, welding, and the like.
As shown in fig. 1, a pin 5 is fixed on one side of a sensor housing 1, a bearing 4 is sleeved on the pin 5, a mechanical transmission gear 6 is sleeved on the bearing 4, so that the pin, the bearing and the mechanical transmission gear are coaxial, and the pin 5 is perpendicular to a support rod 3.
As shown in fig. 1, the sliding track 11 is installed at the bottom of the sensor housing 1 and is provided with 4 sliding blocks 17, the wedge-shaped sliding block 13 is assembled with the sliding blocks 17 through screws and is installed on the sliding track 11 to realize sliding, the wedge-shaped sliding block 13 is provided with a first gear sliding rail 18 which is meshed with the mechanical transmission gear 6,
as shown in fig. 1, a strut 3 is fixed on one side of a mechanical transmission gear 6, a displacement measuring telescopic rod 2 is fixed on the side surface of the strut 3, a protective tube 16 is fixed in a sensor housing 1, a spring 12 is installed in the protective tube 16, one end of the displacement measuring telescopic rod 2 is fixed in the protective tube 16, and a second gear sliding rail 19 is arranged on the side surface of the other end and meshed with the mechanical transmission gear 6.
The utility model discloses a theory of operation: during installation, the first tail fiber and the second tail fiber are connected with a collecting instrument, and the displacement telescopic rod 2 is connected with an external structure. When the displacement telescopic rod 2 extending out of the sensor shell 1 is displaced, the spring is stretched to drive the mechanical transmission gear 6 to rotate on the first gear slide rail 18, meanwhile, the mechanical transmission gear 6 rotates on the second gear sliding rail 19 to drive the wedge-shaped sliding block 13 to slide on the sliding rail 11, the movement of the wedge-shaped sliding block 13 pushes the support rod 3 to bend and deform the equal-strength elastic beam 14, so that the first fiber grating 7 and the second fiber grating 8 symmetrically adhered to the upper and lower surfaces of the constant strength elastic beam 14 are deformed in cooperation with the surface of the constant strength elastic beam 14, so that the center wavelengths of the first and second fiber gratings 7 and 8 are shifted by a certain amount due to strain, the relationship between the central wavelength of the first fiber bragg grating 7 and the central wavelength of the second fiber bragg grating 8 and the displacement of the displacement telescopic rod 2 can be obtained through analysis, and therefore displacement detection is achieved.
Finally, it should be noted that: 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 (5)
1. A fiber grating displacement sensor of gear mechanical linkage, its characterized in that, this sensor includes: the device comprises a sensor shell (1), a displacement measurement telescopic rod (2), a support rod (3), a bearing (4), a pin shaft (5), a mechanical transmission gear (6), a first fiber bragg grating (7), a second fiber bragg grating (8), a first tail fiber (9), a second tail fiber (10), a sliding track (11), a spring (12), a wedge-shaped sliding block (13), an equal-strength elastic beam (14), a cushion block (15), a protection pipe (16), a sliding block (17), a first gear sliding rail (18) and a second gear sliding rail (19);
a pin shaft (5) is fixed on one side of a sensor shell (1) provided with an inner cavity, a bearing (4) is sleeved on the pin shaft (5), and a mechanical transmission gear (6) is sleeved on the bearing (4);
the sliding rail (11) is installed at the bottom of the sensor shell (1) and is provided with 4 sliding blocks (17), the wedge-shaped sliding block (13) is assembled with the sliding blocks (17) through screws and installed on the sliding rail (11) to realize sliding, the wedge-shaped sliding block (13) is provided with a first gear sliding rail (18) and is meshed with the mechanical transmission gear (6), one end of the equal-strength elastic beam (14) is fixed on the cushion block (15) through a screw, the other end of the equal-strength elastic beam is connected with the fixed supporting rod (3), and the supporting rod (3) is in contact with the wedge-shaped sliding block (13);
the pin shaft (5) is vertical to the support rod (3), and the support rod (3) is vertical to the equal-strength elastic beam (14);
the upper surface and the lower surface of the equal-strength elastic beam (14) are symmetrically stuck with a first fiber grating (7) and a second fiber grating (8) respectively; the first tail fiber (9) and the second tail fiber (10) are respectively stuck on the upper surface and the lower surface of the equal-strength elastic beam (14); the first tail fiber (9) is connected with the first fiber bragg grating (7), and the second tail fiber (10) is connected with the second fiber bragg grating (8);
mechanical drive gear (6) one side fixed branch (3), branch (3) side fixed displacement measurement telescopic link (2), sensor housing (1) internal fixation protection tube (16), installation spring (12) in protection tube (16), displacement measurement telescopic link (2) one end is fixed in protection tube (16), and the other end side is furnished with second gear slide rail (19), meshes with mechanical drive gear (6).
2. The fiber grating displacement sensor of claim 1, wherein: the displacement measurement telescopic rod (2) penetrates out of the sensor shell (1).
3. The fiber grating displacement sensor of claim 1, wherein: the first tail fiber (9) and the second tail fiber (10) penetrate out of the sensor shell (1).
4. The fiber grating displacement sensor of claim 1, wherein: the supporting rod (3) is coaxial with the mechanical transmission gear (6).
5. The fiber grating displacement sensor of claim 1, wherein: wedge slider (13) bottom is the cuboid boss, surface mounting hypotenuse and second gear slide rail (19), and the hypotenuse is from the right side to the left and gradually highly sets up, and hypotenuse and second gear slide rail (19) are parallel simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120240121.9U CN214095927U (en) | 2021-01-28 | 2021-01-28 | Fiber grating displacement sensor of gear mechanical linkage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120240121.9U CN214095927U (en) | 2021-01-28 | 2021-01-28 | Fiber grating displacement sensor of gear mechanical linkage |
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| CN214095927U true CN214095927U (en) | 2021-08-31 |
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| CN202120240121.9U Active CN214095927U (en) | 2021-01-28 | 2021-01-28 | Fiber grating displacement sensor of gear mechanical linkage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11796310B1 (en) * | 2022-06-10 | 2023-10-24 | University Of Macau | Fiber Bragg grating displacement sensor with positive and negative bidirectional measurement and free from vibration |
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2021
- 2021-01-28 CN CN202120240121.9U patent/CN214095927U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11796310B1 (en) * | 2022-06-10 | 2023-10-24 | University Of Macau | Fiber Bragg grating displacement sensor with positive and negative bidirectional measurement and free from vibration |
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