An on-line monitoring device for bolt loosening of wind turbine blade by ultrasonic wave

Abstract

The application discloses a kind of wind turbine blade bolt loosening ultrasonic on-line monitoring device, it is related to bolt loosening ultrasonic monitoring technical field, including fixed structure, the fixed structure is installed with support structure, the support structure is slidably provided with adjusting structure, the adjusting structure is installed with monitoring structure, the side of adjusting structure is provided with first mounting bracket, position recognition camera is installed on the first mounting bracket, the support structure includes support ring, four connecting structures are evenly distributed on the side of the support ring, and the inner side of the support ring is provided with inner sliding groove.Fixed structure is fixed to monitoring position, real-time monitoring operation is realized by monitoring structure, the timeliness of bolt loosening monitoring is improved, the monitoring position of monitoring structure is automatically adjusted by adjusting structure sliding on support ring, which is conducive to the flexibility of monitoring, improves detection efficiency, the accuracy of low-frequency ultrasonic detection probe monitoring is improved by cleaning the monitoring surface by brush disc.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic monitoring technology for loose bolts, and more particularly to an online ultrasonic monitoring device for loose bolts on wind turbine blades. Background Technology

[0002] As the core component for capturing wind energy, the reliability of the connection between wind turbine blades and the hub and blade stem directly determines the safety of the entire turbine's operation. Blade bolts, as critical load-bearing connectors, must withstand complex conditions such as gust impacts, alternating loads, temperature cycles, and salt spray corrosion over long periods. They are highly susceptible to preload decay or loosening, which can lead to increased blade vibration, connection failure, or even catastrophic accidents such as blade detachment. Ultrasonic online monitoring technology, with its advantages of being non-invasive, having strong penetration, and providing real-time response, can detect this by measuring the axial stress change in bolts when subjected to axial tension. This change in the ultrasonic wave propagation speed allows for the calculation of the axial stress change within the bolt, thus determining whether the bolt is loose. For example, a Chinese patent (authorization announcement number CN208187711U) discloses a measuring element for an ultrasonic testing instrument for wind turbine bolts. When using this patented technology, a finger is inserted into a finger sleeve, with the measuring probe located at the tip of the finger. The finger allows for flexible operation, applying pressure to the measuring probe, making the operation convenient. This utility model has a reasonable structural design, a complete system, low cost, and simple operation, which improves the operability of ultrasonic testing of wind turbine bolts. However, existing publicly available ultrasonic monitoring devices for bolt loosening still have some shortcomings in practical applications that need improvement, such as: Using a handheld method to press the monitoring position to detect bolt loosening makes it impossible to monitor bolt loosening in real time, affecting the timeliness of bolt loosening monitoring; The need for an operator at height to assist in the inspection reduces the flexibility of the inspection, and the manual adjustment of the inspection position results in low inspection efficiency. Directly pressing the probe onto the monitoring surface without cleaning it can lead to dust and contaminants affecting the accuracy of the monitoring data. Therefore, those skilled in the art have developed an ultrasonic online monitoring device for loose bolts on wind turbine blades to address the problems mentioned in the background section. Summary of the Invention

[0003] The purpose of this invention is to provide an ultrasonic online monitoring device for loose bolts on wind turbine blades, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: An ultrasonic online monitoring device for loose bolts on wind turbine blades includes a fixed structure, a support structure mounted on the fixed structure, an adjustment structure slidably mounted on the support structure, a monitoring structure mounted on the adjustment structure, a first mounting frame on one side of the adjustment structure, and a position recognition camera mounted on the first mounting frame. The support structure includes a support ring, four connecting structures are evenly distributed on one side of the support ring, an inner groove is provided on the inner side of the support ring, and an outer groove is provided on the outer side of the support ring. The adjustment structure includes an adjustment frame, a first drive motor is installed at the lower end of the adjustment frame, a drive wheel is provided at the power output end of the first drive motor, two driven wheels are rotatably arranged on one side of the adjustment frame, an adjustment groove is opened on the upper side of the adjustment frame, a second drive motor is installed at the front side of the adjustment frame, and a first threaded rod is provided at the power output end of the second drive motor. The monitoring structure includes a slide, an adjusting tube on the lower side of the slide, a second mounting bracket on the lower side of the adjusting tube, a first electric telescopic rod mounted on one end of the second mounting bracket, a first push plate on the power output end of the first electric telescopic rod, a low-frequency ultrasonic detection probe mounted on the first push plate, a second electric telescopic rod mounted on the other end of the second mounting bracket, a second push plate on the power output end of the second electric telescopic rod, a third drive motor mounted on the second push plate, and a brush plate on the power output end of the third drive motor.

[0005] As a further embodiment of the invention: the transmission wheel is rotatably disposed within the outer sliding groove, and the driven wheel is rotatably disposed within the inner sliding groove. This structural design facilitates the sliding of the adjustment frame on one side of the support ring.

[0006] As a further embodiment of the present invention: the first threaded rod is located below the adjusting groove, and the first threaded rod is rotatably disposed within the adjusting frame. This structural design facilitates the adjustment of the position of the adjusting structure and the monitoring structure.

[0007] As a further embodiment of the present invention: the adjusting frame is slidably disposed on one side of the support ring, the slide is slidably disposed within the adjusting groove, and the first threaded rod is threadedly engaged within the adjusting tube. This structural design improves the stability of the adjusting tube sliding on the first threaded rod.

[0008] As a further embodiment of the invention, the connecting structure is press-fitted onto the fixed structure. This structural design facilitates the assembly of the fixed structure and the supporting structure.

[0009] As a further embodiment of the present invention: the fixing structure includes a fixing ring, a second threaded rod screwed onto the fixing ring, a pressure plate rotatably disposed at one end of the second threaded rod, a first limiting nut screwed onto the second threaded rod, and a second limiting nut screwed onto the second threaded rod. This structural design facilitates the fixing operation of the fixing structure.

[0010] As a further embodiment of the present invention: eight sets of the second threaded rod, pressure plate, first limiting nut, and second limiting nut are provided, and the eight sets of the second threaded rod, pressure plate, first limiting nut, and second limiting nut are evenly distributed on the fixing ring. This structural design improves the stability after fixing.

[0011] As a further embodiment of the present invention: the first limiting nut is rotated and pressed tightly inside the fixing ring, and the second limiting nut is rotated and pressed tightly outside the fixing ring. This structural design prevents the connection between the second threaded rod and the fixing ring from loosening, thereby improving the firmness of the fixing ring.

[0012] As a further embodiment of the present invention: the connecting structure includes a connecting frame, one end of which is threaded with a third threaded rod, one end of which is rotatably fitted with a pressure block, and the other end of the connecting frame is provided with a connecting rod, one end of which is fixed to a support ring. This structural design facilitates the fixing operation of the connecting structure.

[0013] As a further embodiment of the present invention: the connecting frame is slidably disposed on the fixed ring, and the pressure block is slidably disposed on the front side of the connecting frame, the pressure block being slidably pressed against the fixed ring. This structural design facilitates the stable pressing of the connecting frame onto the fixed ring.

[0014] This invention provides an ultrasonic online monitoring device for loose bolts on wind turbine blades, which has the following advantages compared with the prior art: 1. The present invention fixes the fixed structure to the monitoring position, and monitors the operation in real time through the monitoring structure without the need for human intervention, thereby improving the timeliness of bolt loosening monitoring and eliminating the safety hazards caused by manual intervention.

[0015] 2. This invention adjusts the monitoring position of the monitoring structure automatically by allowing the adjustment structure to slide on the support ring, which improves the flexibility of monitoring and increases detection efficiency. 3. This invention cleans the monitoring surface with a brush, avoiding the impact of dust and contaminants on monitoring operations and improving the accuracy of low-frequency ultrasonic detection probes. Attached Figure Description

[0016] Figure 1 A schematic diagram of an ultrasonic online monitoring device for loose bolts on wind turbine blades; Figure 2This is a schematic diagram of the support structure in an ultrasonic online monitoring device for loose bolts on wind turbine blades. Figure 3 An ultrasonic online monitoring device for loose bolts on wind turbine blades Figure 2 A schematic diagram of the structure of part A; Figure 4 This is a schematic diagram of the adjustment structure in an ultrasonic online monitoring device for loose bolts on wind turbine blades. Figure 5 This is a schematic diagram of the monitoring structure in an ultrasonic online monitoring device for loose bolts on wind turbine blades. Figure 6 A schematic diagram of the fixing structure in an ultrasonic online monitoring device for loose bolts on wind turbine blades; Figure 7 An ultrasonic online monitoring device for loose bolts on wind turbine blades Figure 6 A structural diagram of section B; Figure 8 This is a schematic diagram of the connection structure in an ultrasonic online monitoring device for loose bolts on wind turbine blades.

[0017] In the diagram: 1. Fixed structure; 2. Support structure; 3. Adjustment structure; 4. Monitoring structure; 5. First mounting bracket; 6. Position recognition camera; 7. Support ring; 8. Connecting structure; 9. Inner slide groove; 10. Outer slide groove; 11. Adjustment bracket; 12. First drive motor; 13. Drive wheel; 14. Driven wheel; 15. Adjustment groove; 16. First threaded rod; 17. Second drive motor; 18. Slide carriage; 19. Adjustment tube; 20. Second mounting bracket; 21. First electric telescopic rod; 22. First push plate; 23. Low-frequency ultrasonic detection probe; 24. Second electric telescopic rod; 25. Second push plate; 26. Third drive motor; 27. Brush plate; 28. Fixed ring; 29. ​​Second threaded rod; 30. Pressure plate; 31. First limit nut; 32. Second limit nut; 33. Connecting bracket; 34. Third threaded rod; 35. Pressure block; 36. Connecting rod. Detailed Implementation

[0018] Please see Figures 1-5In this embodiment of the invention, an ultrasonic online monitoring device for loose bolts on wind turbine blades includes a fixed structure 1, a support structure 2 mounted on the fixed structure 1, an adjusting structure 3 slidably mounted on the support structure 2, a monitoring structure 4 mounted on the adjusting structure 3, a first mounting frame 5 on one side of the adjusting structure 3, a position recognition camera 6 mounted on the first mounting frame 5, the support structure 2 including a support ring 7, four connecting structures 8 evenly distributed on one side of the support ring 7, an inner sliding groove 9 on the inner side of the support ring 7, and an outer sliding groove 10 on the outer side of the support ring 7, the adjusting structure 3 including an adjusting frame 11, a first drive motor 12 mounted on the lower end of the adjusting frame 11, a drive wheel 13 mounted on the power output end of the first drive motor 12, and the adjusting frame 11... Two driven wheels 14 are rotatably arranged on one side of the adjustment frame 11. An adjustment groove 15 is opened on the upper side of the adjustment frame 11. A second drive motor 17 is installed on the front side of the adjustment frame 11. A first threaded rod 16 is provided at the power output end of the second drive motor 17. The monitoring structure 4 includes a slide 18. An adjustment tube 19 is provided on the lower side of the slide 18. A second mounting frame 20 is provided on the lower side of the adjustment tube 19. A first electric telescopic rod 21 is installed at one end of the second mounting frame 20. A first push plate 22 is provided at the power output end of the first electric telescopic rod 21. A low-frequency ultrasonic detection probe 23 is installed on the first push plate 22. A second electric telescopic rod 24 is installed at the other end of the second mounting frame 20. A second push plate 25 is provided at the power output end of the second electric telescopic rod 24. A third drive motor 26 is mounted on plate 25. A brush plate 27 is provided at the power output end of the third drive motor 26. The drive wheel 13 is rotatably mounted in the outer slide groove 10, and the driven wheel 14 is rotatably mounted in the inner slide groove 9. The first threaded rod 16 is located below the adjusting groove 15 and is rotatably mounted in the adjusting frame 11. The adjusting frame 11 is slidably mounted on one side of the support ring 7. The slide frame 18 is slidably mounted in the adjusting groove 15. The first threaded rod 16 is threaded into the adjusting tube 19. The connecting structure 8 is pressed and installed on the fixed structure 1. First, the fixed structure 1 is fitted next to the fixing position of the wind turbine blade bolts and fixed. The connecting structure 8 is slid to the inside of the fixed structure 1 and fixed. Then, it is put into use. The second drive motor 17 drives the first threaded rod 16. The threaded rod 16 rotates clockwise, causing the first threaded rod 16 to rotate clockwise within the adjusting tube 19. The adjusting tube 19 moves forward, and the slide 18 slides within the adjusting groove 15, guiding the adjusting tube 19. The brush disc 27 moves to the center of the corresponding adjusting frame 11. The second electric telescopic rod 24 moves, pushing the second push plate 25 downward. The second push plate 25 drives the brush disc 27 downward, pressing it onto the wind turbine blades. The third drive motor 26 rotates, causing the brush disc 27 to rotate and clean the detection area of ​​the wind turbine blades. After cleaning, the second electric telescopic rod 24 moves, causing the second push plate 25 to move upward. The second push plate 25 drives the brush disc 27 upward, removing it from the wind turbine blades. The second drive motor 17 then rotates the first threaded rod 16 counterclockwise.The first threaded rod 16 rotates counterclockwise within the adjusting tube 19, causing the adjusting tube 19 to move backward. The slide 18 slides within the adjusting groove 15, guiding the adjusting tube 19. The low-frequency ultrasonic detection probe 23 moves to the center of the corresponding adjusting frame 11. The first electric telescopic rod 21 moves, pushing the first push plate 22 downward. The first push plate 22 drives the low-frequency ultrasonic detection probe 23 downward, pressing it against the detection position of the wind turbine blade. The low-frequency ultrasonic detection probe 23 operates to detect bolt loosening, and the position recognition camera 6 operates. The operation of monitoring structure 4 is monitored. After monitoring, the first electric telescopic rod 21 moves, causing the first push plate 22 to move upward. The first push plate 22 moves the low-frequency ultrasonic detection probe 23 upward, moving it away from the detection position on the wind turbine blade. The first drive motor 12 then moves, causing the drive wheel 13 to slide in the outer slide groove 10, and the driven wheel 14 to slide in the inner slide groove 9. This adjusts the position of the adjusting structure 3, thereby adjusting the position of monitoring structure 4 on the wind turbine blade. The cleaning and monitoring of the detection position on the wind turbine blade are then repeated in the same manner.

[0019] exist Figure 6 , 7 In the middle section: the fixing structure 1 includes a fixing ring 28, on which a second threaded rod 29 is threadedly screwed. A pressure plate 30 is rotatably mounted on one end of the second threaded rod 29. A first limiting nut 31 and a second limiting nut 32 are threadedly screwed onto the second threaded rod 29. Eight sets of these components are evenly distributed on the fixing ring 28. The first limiting nut 31 rotates and presses tightly inside the fixing ring 28, while the second limiting nut 32 rotates and presses tightly outside the fixing ring 28. The fixing structure 1 is then fitted next to the fixing position of the wind turbine blade bolts. The second limiting nut 32 rotates counterclockwise on the second threaded rod 29, and the second limiting nut 32 moves away from the fixing ring 28. The first limiting nut 31 rotates clockwise on the second threaded rod 29, and the first limiting nut 31 moves away from the fixing ring 28. The second threaded rod 29 rotates clockwise on the fixing ring 28 and rotates outside the pressure plate 30. The pressure plate 30 presses against the fixing position of the wind turbine blade bolt, completing the fixing of the fixing ring 28. The second limiting nut 32 rotates clockwise on the second threaded rod 29 and presses against the fixing ring 28. The first limiting nut 31 rotates counterclockwise on the second threaded rod 29 and presses against the fixing ring 28, fixing the position of the second threaded rod 29.

[0020] exist Figure 8In the middle: the connecting structure 8 includes a connecting frame 33, one end of which is threaded with a third threaded rod 34, one end of which is rotatably provided with a pressure block 35, and the other end of the connecting frame 33 is provided with a connecting rod 36. One end of the connecting rod 36 is fixed on the support ring 7. The connecting frame 33 is slidably disposed on the fixed ring 28, and the pressure block 35 is slidably disposed on the front side of the connecting frame 33. The pressure block 35 slides and presses against the fixed ring 28. The connecting frame 33 slides to the inner side of the fixed ring 28, the third threaded rod 34 rotates clockwise on the connecting frame 33, the third threaded rod 34 rotates on the pressure block 35, the pressure block 35 slides on the front side of the connecting frame 33, and the pressure block 35 presses against the fixed ring 28. The connecting frame 33 is fixed to the fixed ring 28.

[0021] The working principle of this invention is as follows: First, the fixing structure 1 is fitted onto the fixing position of the wind turbine blade bolt. The second limiting nut 32 rotates counterclockwise on the second threaded rod 29, disengaging from the fixing ring 28. The first limiting nut 31 rotates clockwise on the second threaded rod 29, disengaging from the fixing ring 28. The second threaded rod 29 rotates clockwise on the fixing ring 28, rotating outside the pressure plate 30. The pressure plate 30 presses against the fixing position of the wind turbine blade bolt, completing the fixing of the fixing ring 28. The second limiting nut 32 rotates clockwise on the second threaded rod 29, pressing against the fixing ring 28. The first limiting nut 31 rotates counterclockwise on the second threaded rod 29. The first limiting nut 31 is pressed into the fixing ring 28, fixing the position of the second threaded rod 29. The connecting frame 33 slides to the inner side of the fixing ring 28. The third threaded rod 34 rotates clockwise on the connecting frame 33 and rotates on the pressure block 35. The pressure block 35 slides on the front side of the connecting frame 33 and presses against the fixing ring 28. The connecting frame 33 is fixed to the fixing ring 28. Then, the second drive motor 17 drives the first threaded rod 16 to rotate clockwise. The first threaded rod 16 rotates clockwise in the adjusting tube 19. The adjusting tube 19 moves forward, and the slide 18 slides in the adjusting groove 15, guiding the adjusting tube 19. The brush plate 27 moves to the center of the corresponding adjusting frame 11. The second electric telescopic rod 24 runs to push the first threaded rod 29 to rotate clockwise. The second push plate 25 moves downward, causing the brush plate 27 to move downward as well. The brush plate 27 presses onto the wind turbine blades. The third drive motor 26 rotates, causing the brush plate 27 to rotate and clean the detection area of ​​the wind turbine blades. After cleaning, the second electric telescopic rod 24 moves, causing the second push plate 25 to move upward. The second push plate 25 moves the brush plate 27 upward, causing it to leave the wind turbine blades. The second drive motor 17 then rotates the first threaded rod 16 counterclockwise. The first threaded rod 16 rotates counterclockwise within the adjusting tube 19, causing the adjusting tube 19 to move backward. The slide 18 slides within the adjusting groove 15, guiding the adjusting tube 19. The low-frequency ultrasonic detection probe 23 moves to the center of the corresponding adjusting frame 11. The first electric telescopic rod 21 then pushes the first push plate 25 upward. Plate 22 moves downward, and the first push plate 22 drives the low-frequency ultrasonic detection probe 23 to move downward. The low-frequency ultrasonic detection probe 23 presses against the detection position of the wind turbine blade. The low-frequency ultrasonic detection probe 23 operates to detect bolt loosening. The position recognition camera 6 operates to detect the operation of the monitoring structure 4. After detection, the first electric telescopic rod 21 operates to drive the first push plate 22 to move upward. The first push plate 22 drives the low-frequency ultrasonic detection probe 23 to move upward. The low-frequency ultrasonic detection probe 23 leaves the detection position of the wind turbine blade. The first drive motor 12 operates to drive the drive wheel 13 to slide in the outer slide groove 10, and the driven wheel 14 to slide in the inner slide groove 9, adjusting the position of the adjusting structure 3, thereby adjusting the position of the monitoring structure 4 on the wind turbine blade.Repeat the cleaning and monitoring of the inspection points on the wind turbine blades as described above.

[0022] Among them: the location recognition camera 6 is model DS-2CD3T25-I3(H); The first drive motor 12, the second drive motor 13, and the third drive motor 26 are model ISMH2-10C30CD; The first electric telescopic pole 21 and the second electric telescopic pole 24 are model SLEL505; For the specific model of the low-frequency ultrasonic testing probe 23, please refer to the following website: https: / / b2b.baidu.com / land?url=https%3A%2F%2Fb2bwork.baidu.com%2Fland%3Flid%3D1767235216884595107&query=%E4%BD%8E%E9%A2%91%E8%B6%85%E5%A3%B0&lattr=ot&xzhid=30733519&pi=b2b.s.main.2..0536629269438277&ca tagory=%E7%94%B5%E5%AD%90%E5%85%83%E5%99%A8%E4%BB%B6%3B%E4%BC%A0%E6%84%9F%E5%99%A8%3B%E6%B0%94%E4%BD%93%E4%BC%A0 %E6%84%9F%E5%99%A8&fid=84017152%2C1760404981609&iid=9974df58f2b493682937392747fdb232&jid=2839599995&prod_type=0; The connecting rod 36 is made of 304 stainless steel with an elastic modulus between 190-200 GPa, and is used to ensure that the connecting frame 33 does not slide into the fixing ring 28.

[0023] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An ultrasonic online monitoring device for loose bolts on wind turbine blades, comprising a fixing structure (1), characterized in that, A support structure (2) is installed on the fixed structure (1), an adjustment structure (3) is slidably arranged on the support structure (2), a monitoring structure (4) is installed on the adjustment structure (3), a first mounting bracket (5) is provided on one side of the adjustment structure (3), and a position recognition camera (6) is installed on the first mounting bracket (5). The support structure (2) includes a support ring (7), and four connecting structures (8) are evenly distributed on one side of the support ring (7). An inner groove (9) is provided on the inner side of the support ring (7), and an outer groove (10) is provided on the outer side of the support ring (7). The adjustment structure (3) includes an adjustment frame (11), a first drive motor (12) is installed at the lower end of the adjustment frame (11), a drive wheel (13) is provided at the power output end of the first drive motor (12), two driven wheels (14) are rotatably provided on one side of the adjustment frame (11), an adjustment groove (15) is provided on the upper side of the adjustment frame (11), a second drive motor (17) is installed on the front side of the adjustment frame (11), and a first threaded rod (16) is provided at the power output end of the second drive motor (17). The monitoring structure (4) includes a slide (18), an adjustment tube (19) is provided on the lower side of the slide (18), a second mounting bracket (20) is provided on the lower side of the adjustment tube (19), a first electric telescopic rod (21) is installed at one end of the second mounting bracket (20), a first push plate (22) is provided at the power output end of the first electric telescopic rod (21), a low-frequency ultrasonic detection probe (23) is installed on the first push plate (22), a second electric telescopic rod (24) is installed at the other end of the second mounting bracket (20), a second push plate (25) is provided at the power output end of the second electric telescopic rod (24), a third drive motor (26) is installed on the second push plate (25), and a brush plate (27) is provided at the power output end of the third drive motor (26).

2. The ultrasonic online monitoring device for loose bolts on wind turbine blades according to claim 1, characterized in that, The drive wheel (13) is rotatably disposed in the outer slide groove (10), and the driven wheel (14) is rotatably disposed in the inner slide groove (9).

3. The ultrasonic online monitoring device for loose bolts on wind turbine blades according to claim 1, characterized in that, The first threaded rod (16) is located on the lower side of the adjusting groove (15), and the first threaded rod (16) is rotatably disposed in the adjusting frame (11).

4. The ultrasonic online monitoring device for loose bolts on wind turbine blades according to claim 1, characterized in that, The adjusting frame (11) is slidably disposed on one side of the support ring (7), the slide (18) is slidably disposed in the adjusting groove (15), and the first threaded rod (16) is threadedly engaged in the adjusting tube (19).

5. The ultrasonic online monitoring device for loose bolts on wind turbine blades according to claim 1, characterized in that, The connecting structure (8) is pressed and installed on the fixed structure (1).

6. The ultrasonic online monitoring device for loose bolts on wind turbine blades according to claim 1, characterized in that, The fixing structure (1) includes a fixing ring (28), a second threaded rod (29) is threaded on the fixing ring (28), a pressure plate (30) is rotatably provided at one end of the second threaded rod (29), a first limiting nut (31) is threaded on the second threaded rod (29), and a second limiting nut (32) is threaded on the second threaded rod (29).

7. The ultrasonic online monitoring device for loose bolts on wind turbine blades according to claim 6, characterized in that, The second threaded rod (29), pressure plate (30), first limiting nut (31), and second limiting nut (32) are provided in eight sets, and the eight sets of the second threaded rod (29), pressure plate (30), first limiting nut (31), and second limiting nut (32) are evenly distributed on the fixing ring (28).

8. The ultrasonic online monitoring device for loose bolts on wind turbine blades according to claim 6, characterized in that, The first limiting nut (31) rotates and presses itself into the fixing ring (28), and the second limiting nut (32) rotates and presses itself into the fixing ring (28).

9. The ultrasonic online monitoring device for loose bolts on wind turbine blades according to claim 6, characterized in that, The connecting structure (8) includes a connecting frame (33), one end of which is threaded with a third threaded rod (34), one end of which is rotatably provided with a pressure block (35), and the other end of the connecting frame (33) is provided with a connecting rod (36), one end of which is fixed on a support ring (7).

10. The ultrasonic online monitoring device for loose bolts on wind turbine blades according to claim 9, characterized in that, The connecting frame (33) is slidably disposed on the fixing ring (28), and the pressure block (35) is slidably disposed on the front side of the connecting frame (33), and the pressure block (35) is slidably pressed against the fixing ring (28).

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