Wind power tower displacement monitoring device based on fiber bragg grating

Abstract

The utility model relates to a wind power tower displacement monitoring device based on a fiber bragg grating, which comprises a shell, a constant-strength cantilever beam, a fiber bragg grating, a transmission rod, a rack I and a rack II, the constant-strength cantilever beam is arranged in the shell, and the fiber bragg grating is arranged on the constant-strength cantilever beam; the transmission rod is arranged on the second rack, one end of the transmission rod extends out of the shell, the first rack and the second rack are arranged at the top and the bottom of the shell respectively in a sliding fit mode, and the bearing gear is arranged on the shell in a rotating fit mode and meshed with the first rack and the second rack respectively. The transmission rod is stressed to drive the second rack to move, and the first rack is driven to move through the bearing gear, so that the first rack collides with the equal-strength cantilever beam, the equal-strength cantilever beam deforms, the grating length of the fiber grating is subjected to central wavelength change, and the displacement change of the wind power tower is measured. A gear and rack transmission principle is adopted, displacement monitoring of the whole structure is achieved through displacement transfer, and temperature compensation can be achieved while displacement monitoring is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power tower displacement monitoring, in particular to a wind power tower displacement monitoring device based on optical fiber grating. Background Art

[0002] The wind turbine tower is the tower pole of wind power generation. It mainly plays a supporting role in the wind turbine generator set and absorbs the vibration of the unit. The external displacement of the wind turbine tower is an important parameter reflecting the health of the wind turbine tower structure.

[0003] At present, most wind turbine tower displacement monitoring technologies only detect displacement, but do not perform temperature compensation inside the sensor. The structure of displacement monitoring is too simple, and has disadvantages such as poor resistance to electromagnetic interference, poor accuracy, and inability to monitor over long distances.

[0004] Therefore, there is an urgent need for a wind turbine tower displacement monitoring device that can realize the displacement monitoring of the entire structure and achieve temperature compensation while ensuring displacement monitoring. Utility Model Content

[0005] In view of this, the utility model provides a wind power tower displacement monitoring device based on fiber grating, which adopts the gear rack transmission principle and the inherent physical characteristics of the spring, realizes the displacement monitoring of the whole structure through the transfer of displacement, and can also realize temperature compensation while ensuring displacement monitoring. The overall structure is simple and practical, and is suitable for long-distance monitoring in engineering practice.

[0006] The utility model provides a wind power tower displacement monitoring device based on fiber grating, which adopts the following technical solutions:

[0007] A wind power tower displacement monitoring device based on fiber grating comprises a shell, an equal-strength cantilever beam, a fiber grating, a transmission rod, a rack 1 and a rack 2, wherein the shell serves as an installation base, the equal-strength cantilever beam is arranged in the shell, and the fiber grating is arranged on the equal-strength cantilever beam; the transmission rod is arranged on the rack 2 and one end of the transmission rod extends out of the shell, the rack 1 and the rack 2 are respectively slidably matched and arranged on the top and bottom of the shell, and the bearing gear is rotationally matched and arranged in the shell and meshes with the rack 1 and the rack 2 respectively; the transmission rod is driven by force to drive the rack 2 to move, and drives the rack 1 to move through the bearing gear, so that the rack 1 collides with the equal-strength cantilever beam, the equal-strength cantilever beam is deformed, and the grating length of the fiber grating changes the central wavelength, thereby measuring the displacement change of the wind power tower.

[0008] Optionally, the rack 1 and the rack 2 are provided with a sliding groove along their own displacement direction, and a rack support seat is provided on the shell, and the rack support seat is slidably fitted in the sliding groove.

[0009] Optionally, a spring 1 is arranged between one end of the rack 1 away from the equal-strength cantilever beam and the shell, and a spring 2 is arranged between one end of the equal-strength cantilever beam away from the rack 1 and the shell.

[0010] Optionally, the longitudinal section of the equal-strength cantilever beam is an isosceles triangle, two bottom corners of the equal-strength cantilever beam are provided with opening one, and the top corner of the equal-strength cantilever beam is provided with opening two.

[0011] Optionally, a groove is provided on the equal-strength cantilever beam, and the fiber grating is fixedly arranged in the groove of the equal-strength cantilever beam.

[0012] Optionally, the fiber grating includes a temperature compensating fiber grating and an external fiber grating, the external fiber grating is arranged on an equal-strength cantilever beam, an outer shell is arranged in the shell, the temperature compensating fiber grating is encapsulated in the outer shell, the temperature compensating fiber grating is connected to the external fiber grating, and a through hole is provided on the outer shell for the external fiber grating to penetrate and connect with the temperature compensating fiber grating.

[0013] Optionally, clamping steel pipes are provided on both sides of the shell, and the connection part between the clamping steel pipe and the optical fiber grating outside the shell is sealed by a rubber sleeve.

[0014] Optionally, a heat-insulating sleeve is wound around the temperature-compensating optical fiber Bragg grating.

[0015] Optionally, the equal-strength cantilever beam is fixedly arranged inside the shell through a cantilever beam support.

[0016] Optionally, the rack one and rack two are aluminum alloy racks.

[0017] In summary, the utility model includes at least one of the following beneficial technical effects: the gear rack transmission principle and the inherent physical characteristics of the spring are adopted to realize the displacement monitoring of the overall structure through the transfer of the displacement amount, and temperature compensation can be realized while ensuring the displacement monitoring. The overall structure is simple and practical, and is suitable for long-distance monitoring in engineering practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a side view of an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of the overall structure of the cantilever beam support of an embodiment of the utility model.

[0021] Explanation of the reference numerals in the accompanying drawings: 1. cantilever beam support; 2. equal-strength cantilever beam; 3. external fiber Bragg grating; 4. rack support seat one; 5. rack support seat two; 6. rack one; 7. spring support one; 8. overall structural housing; 9. spring one; 10. spring support two; 11. temperature compensation housing; 12. temperature compensation fiber Bragg grating; 13. rack support seat three; 14. transmission shaft sleeve; 15. transmission shaft; 16. bearing gear; 17. rack support seat four; 18. rack two; 19. transmission rod; 20. spring support three; 21. spring support four; 22. spring two. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-3 The utility model is described in further detail.

[0023] The utility model embodiment discloses a wind power tower displacement monitoring device based on optical fiber grating.

[0024] Reference Figure 1-Figure 3 A wind power tower displacement monitoring device based on fiber grating includes a shell, an equal strength cantilever beam 2, a fiber grating, a transmission rod 19, a rack 16 and a rack 2 18. The shell is used as an installation base, the equal strength cantilever beam 2 is arranged in the shell, and the fiber grating is arranged on the equal strength cantilever beam 2; the transmission rod 19 is arranged on the rack 2 18 and one end extends out of the shell, the rack 16 and the rack 2 18 are respectively arranged at the top and bottom of the shell in a sliding manner, and the bearing gear 16 is rotatably arranged in the shell and meshes with the rack 16 and the rack 2 18 respectively; the transmission rod 19 is driven by force to drive the rack 2 18 to move, and drives the rack 16 to move through the bearing gear 16, so that the rack 16 collides with the equal strength cantilever beam 2, the equal strength cantilever beam 2 is deformed, and the grating length of the fiber grating changes the central wavelength, so as to measure the displacement change of the wind power tower. The gear rack transmission principle and the inherent physical characteristics of the spring are adopted to realize the displacement monitoring of the overall structure through the transfer of the displacement, and temperature compensation can be realized while ensuring the displacement monitoring. The overall structure is simple and practical, suitable for long-distance monitoring in actual engineering projects.

[0025] In this embodiment, the equal strength cantilever beam 2 is fixedly arranged inside the shell through the cantilever beam support 1. Specifically, the longitudinal section of the equal strength cantilever beam 2 is an isosceles triangle, and the two bottom corners of the equal strength cantilever beam 2 are provided with opening 1, and the top corner of the equal strength cantilever beam 2 is provided with opening 2. A groove is provided on the equal strength cantilever beam 2, and the fiber grating is fixedly arranged at the groove of the equal strength cantilever beam 2. The stress on the equal strength cantilever beam 2 is equal everywhere, the sensitivity of the sensor is improved, and the sensor displacement calculation method is simple, which is suitable for engineering detection.

[0026] A spring 9 is arranged between the end of the rack 6 away from the equal strength cantilever beam 2 and the housing, and a spring 22 is arranged between the end of the equal strength cantilever beam 2 away from the rack 6 and the housing. A spring support 7 is arranged on the rack 6, a spring support 2 10 is arranged on the housing, and the spring 9 is connected to the spring support 7 and the spring support 2 10. A spring support 3 20 is arranged on the equal strength cantilever beam 2, a spring support 4 21 is arranged on the housing, and the spring 2 22 is connected to the spring support 3 20 and the spring support 4 21.

[0027] In this embodiment, rack 1 6 and rack 2 18 are aluminum alloy racks. Rack 1 6 and rack 2 18 are provided with a slide groove along their own displacement direction, and a rack support seat is provided on the housing, and the rack support seat is slidably arranged in the slide groove. Specifically, rack support seat 1 4 and rack support seat 2 5 are arranged at intervals on the top of the housing, which are used to slide with the slide groove of rack 1 6, and rack support seat 3 13 and rack support seat 4 17 are arranged at intervals on the bottom of the housing, which are used to slide with the slide groove of rack 2 18. The rack support seat is used to limit the sliding of rack 1 6 and rack 2 18, thereby ensuring the accuracy of the movement of rack 1 6 and rack 2 18.

[0028] The transmission rod 19 is connected to the wind turbine tower. The transmission rod 19 is driven by force to cause the rack 2 18 to change in displacement. The meshing of the rack 2 18 and the bearing gear 16 outputs the displacement to the rack 1 6 meshing with the upper side of the bearing gear 16. The rack 1 6 changes in displacement and collides with the equal-strength cantilever beam 2. The spring 1 9 is in a stretched state, and the spring 2 22 is in a compressed state. The equal-strength cantilever beam 2 is deformed, and the grating length of the fiber grating changes in the central wavelength, thereby measuring the displacement change of the wind turbine tower.

[0029] The utility model adopts a rack and pinion transmission structure, which reduces material costs, has a simple internal transmission structure, a simple sensor structure, and the rack and pinion transmission can meet the needs of long-distance detection.

[0030] In this embodiment, in order to achieve better transmission, a transmission shaft 15 is rotatably provided on the shell, a transmission sleeve 14 is sleeved on the transmission shaft 15, and the bearing gear 16 is fixed to the transmission sleeve 14 through the transmission shaft 15. The base of the transmission sleeve 14 is provided with four bolt holes spaced along its circumference, and the transmission shaft 15 and the bearing gear 16 are clearance-fitted.

[0031] In this embodiment, the fiber Bragg grating includes a temperature compensating fiber Bragg grating 12 and an external fiber Bragg grating 3. The external fiber Bragg grating 3 is arranged on the equal-strength cantilever beam 2. An outer shell is arranged in the shell. The temperature compensating fiber Bragg grating 12 is encapsulated in the outer shell. The temperature compensating fiber Bragg grating 12 is connected to the external fiber Bragg grating 3. A through hole is provided on the outer shell for the external fiber Bragg grating 3 to penetrate and connect with the temperature compensating fiber Bragg grating 12.

[0032] For the temperature compensation of the fiber Bragg grating, clamping steel pipes are arranged on both sides of the shell, and the connection between the clamping steel pipes and the fiber Bragg grating outside the shell is sealed by a rubber sleeve. A heat-insulating sleeve is wound around the temperature compensation fiber Bragg grating 12.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A wind power tower displacement monitoring device based on fiber grating, characterized in that: The invention comprises a shell, an equal-strength cantilever beam, an optical fiber grating, a transmission rod, a rack 1 and a rack 2, wherein the shell serves as an installation base, the equal-strength cantilever beam is arranged in the shell, and the optical fiber grating is arranged on the equal-strength cantilever beam; the transmission rod is arranged on the rack 2 and one end of the transmission rod extends out of the shell, the rack 1 and the rack 2 are respectively slidingly matched and arranged on the top and the bottom of the shell, and the shell is rotationally matched and provided with bearing gears, and the bearing gears are respectively meshed with the rack 1 and the rack 2; the transmission rod is subjected to force to drive the rack 2 to move, and drives the rack 1 to move through the bearing gear, so that the rack 1 collides with the equal-strength cantilever beam, the equal-strength cantilever beam is deformed, and the grating length of the optical fiber grating changes the central wavelength, thereby measuring the displacement change of the wind power tower.

2. The wind turbine tower displacement monitoring device based on fiber grating according to claim 1 is characterized in that: The racks 1 and 2 are provided with sliding grooves along their own displacement directions, and a rack support seat is provided on the shell body, and the rack support seat is slidably matched in the sliding grooves.

3. The wind turbine tower displacement monitoring device based on fiber grating according to claim 2 is characterized in that: A spring 1 is arranged between one end of the rack 1 away from the equal-strength cantilever beam and the housing, and a spring 2 is arranged between one end of the equal-strength cantilever beam away from the rack 1 and the housing.

4. The wind turbine tower displacement monitoring device based on fiber Bragg grating according to claim 1, characterized in that: The longitudinal section of the equal-strength cantilever beam is an isosceles triangle, two bottom corners of the equal-strength cantilever beam are provided with a first opening, and a top corner of the equal-strength cantilever beam is provided with a second opening.

5. The wind turbine tower displacement monitoring device based on fiber Bragg grating according to claim 4 is characterized in that: A groove is provided on the equal-strength cantilever beam, and the optical fiber grating is fixedly arranged in the groove of the equal-strength cantilever beam.

6. The wind turbine tower displacement monitoring device based on fiber grating according to claim 1 is characterized in that: The fiber grating includes a temperature-compensating fiber grating and an external fiber grating. The external fiber grating is arranged on an equal-strength cantilever beam. An outer shell is arranged in the shell. The temperature-compensating fiber grating is encapsulated in the outer shell. The temperature-compensating fiber grating is connected to the external fiber grating. A through hole is provided on the outer shell for the external fiber grating to penetrate and connect with the temperature-compensating fiber grating.

7. The wind turbine tower displacement monitoring device based on fiber grating according to claim 6 is characterized in that: Clamping steel pipes are arranged on both sides of the shell, and the connection part between the clamping steel pipe and the optical fiber grating outside the shell is sealed by a rubber sleeve.

8. The wind turbine tower displacement monitoring device based on fiber grating according to claim 6 is characterized in that: A heat-insulating sleeve is wound around the temperature-compensating optical fiber grating.

9. The wind turbine tower displacement monitoring device based on fiber grating according to claim 1, characterized in that: The equal-strength cantilever beam is fixedly arranged inside the shell through the cantilever beam support.

10. The wind turbine tower displacement monitoring device based on fiber Bragg grating according to claim 1, characterized in that: The rack one and the rack two are aluminum alloy racks.

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