A fan blade surface crack detection device

Abstract

The utility model discloses a fan blade surface crack detection device, including support frame, sucking disc (1), camera (2), micro -processing control module, communication module and circuit board, sucking disc (1) sets up in the bottom of support frame periphery, camera (2) sets up in the bottom of support frame center, micro -processing control module and communication module all set up on the circuit board, the circuit board with support frame is fixed, camera (2) with communication module all with micro -processing control module passes through circuit board and realizes circuit connection. The utility model discloses a fan blade surface crack detection device can adjust the shooting angle and shooting distance of camera to reach the best shooting effect, thereby can carry out accurate detection to fan blade surface crack, avoid the blade fracture caused by the fan blade surface crack and unable to discover in time, avoid the high repair cost and fan shutdown loss.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine blade maintenance and management, and in particular to a device for detecting surface cracks in wind turbine blades. Background Technology

[0002] With the rapid development of renewable energy globally, the proportion of wind power generation is increasing year by year. However, one of the core challenges to the operational efficiency and safety of wind turbines is the risk of blade damage. Under the influence of extreme weather such as lightning and hail, and the long-term environmental corrosion from ultraviolet radiation and salt spray, wind turbine blades can suffer damage such as surface cracks. If these damages are not detected in time, tiny cracks may propagate rapidly, eventually leading to catastrophic blade breakage, resulting in high repair costs and wind turbine downtime losses. Current technologies for detecting surface cracks in wind turbine blades typically employ a fixed detection device. This allows for inspection of the current blade as it rotates within the detection range. However, this fixed detection device approach has limitations. Firstly, it is ineffective at detecting the edges of wind turbine blades. Secondly, it can only periodically inspect specific locations on the turbine. When an anomaly is detected, further detailed sampling of the abnormal location is not possible, or the turbine must be shut down before detailed sampling can be performed, resulting in low detection efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a device for detecting surface cracks in wind turbine blades.

[0004] The wind turbine blade surface crack detection device provided by this utility model includes a support frame, a suction cup (1), a camera (2), a microprocessor control module, a communication module, and a circuit board; the suction cup (1) is located at the bottom of the periphery of the support frame; the camera (2) is located at the bottom of the center of the support frame; the microprocessor control module and the communication module are both located on the circuit board, and the circuit board is fixed to the support frame; the camera (2) and the communication module are both connected to the microprocessor control module through the circuit board.

[0005] The wind turbine blade surface crack detection device provided by this utility model also includes a suction cylinder (3), which is disposed at the bottom of the periphery of the support frame; the suction cup (1) is fixed to the actuator of the suction cylinder (3). The support frame includes a first frame (4) and a second frame (5); the first frame (4) and the second frame (5) are slidably connected; the bottom of the first frame (4) and the second frame (5) are provided with a suction cup (1) and a suction cylinder (3). The first frame (4) is a plate-shaped triangular star including a first end (401), a second end (402) and a third end (403); the second frame (5) is a plate-shaped triangular star including a fourth end (501), a fifth end (502) and a sixth end (503); a suction cylinder (3) mounting bracket is fixed at the bottom of each of the first end (401), the second end (402), the third end (403), the fourth end (501), the fifth end (502) and the sixth end (503); the number of suction cylinders (3) is 6, and the 6 suction cylinders (3) are respectively fixed at the bottom of the first end (401), the second end (402), the third end (403), the fourth end (501), the fifth end (502) and the sixth end (503) by the suction cylinder (3) mounting bracket. The wind turbine blade surface crack detection device provided by this utility model further includes a sliding connection device; the sliding connection device includes a sliding connection plate (6), a sliding cylinder (7), a first slide rod (8), a second slide rod (9), a first slider (10), a second slider (11); a first slide rod support block (12), a second slide rod support block (13), a third slide rod support block (14), and a fourth slide rod support block (15); the sliding connection plate (6) is fixed to the top of the second frame (5); the first slide rod support block (12) and the second slide rod support block (13) are fixed to the bottom of the first frame (4); the first slide rod support block (12), the second slide rod support block (13), the third slide rod support block (14), the second slide rod support block (15), the first slide rod support block (12), the second slide rod support block (13), the third ... The slide bar support block (14) and the fourth slide bar support block (15) are fixed to the top of the sliding connecting plate (6); the first slide bar (8) passes through the first slider (10) and its two ends are respectively fixed to the first slide bar support block (12) and the second slide bar support block (13); the second slide bar (9) passes through the second slider (11) and its two ends are respectively fixed to the third slide bar support block (14) and the fourth slide bar support block (15); the sliding cylinder (7) is fixed to the top of the sliding connecting plate (6); the actuating end of the sliding cylinder (7) is fixed to the bottom of the first frame (4); the sliding cylinder (7), the first slide bar (8) and the second slide bar (9) are all arranged in parallel.The wind turbine blade surface crack detection device provided by this utility model also includes a camera connection device, which includes a camera mounting rod (16). The top end of the camera mounting rod (16) is fixed to the bottom of the second frame (5). The camera mounting rod (16) is a tubular structure with an internal cavity. The camera (2) is installed at the bottom of the camera mounting rod (16). The circuit board is installed in the cavity. The camera connection device further includes a first connecting cylinder (17), a second connecting cylinder (18), and a connecting plate (19); the camera mounting rod (16) includes a first tube part (1601), a second tube part (1602), and a third tube part (1603); the first tube part (1601), the second tube part (1602), and the third tube part (1603) are sequentially sleeved from the outside to the inside to form a telescopic structure; the camera (2) is installed at the bottom of the third tube part (1603); a first mounting hole is provided at the center of the connecting plate (19); the third tube part (1603) passes through the first mounting hole and is fixed to the connecting plate (19); the first connecting cylinder (17) and the second connecting cylinder (18) are fixed to the bottom of the second frame (5); the actuating end of the first connecting cylinder (17) and the actuating end of the second connecting cylinder (18) are both fixed to the connecting plate (19). The camera connection device also includes a pneumatic motor (20), a worm gear (21), a worm wheel (22), and a motor mounting plate (23). The pneumatic motor (20) and the motor mounting plate (23) are both fixed to the bottom of the second frame (5). The motor mounting plate (23) is provided with a second mounting hole (24). The actuating end of the pneumatic motor (20) passes through the second mounting hole (24) and is fixed to the worm gear (21). The worm wheel (22) is fixedly sleeved on the outer wall of the first tube part (1601). The worm wheel (22) and the worm gear (21) mesh with each other to form a connection. The camera mounting rod (16) also includes a shaft (25). The first tube part (1601) is sleeved on the shaft (25). The shaft (25) is fixed to the bottom of the second frame (5). The inner walls of the first tube section (1601) and the second tube section (1602) are provided with limiting grooves (26); the outer walls of the second tube and the third tube are provided with limiting blocks (27) that match the limiting grooves (26). The wind turbine blade surface crack detection device provided by this utility model also includes 6 suction cup mounting plates (28), the suction cup mounting plates (28) are triangular star-shaped, and the 6 suction cup mounting plates (28) are respectively fixed to the execution ends of 6 suction cup cylinders (3); 3 suction cups (1) are installed at the bottom of each suction cup mounting plate (28).

[0006] The wind turbine blade surface crack detection device provided by this utility model can move and stably adhere to the surface of the wind turbine blade to capture images of the blade surface, thereby obtaining images of the wind turbine blade surface. These images can then be sent to a remote server for data analysis and storage. The wind turbine blade surface crack detection device provided in this embodiment allows adjustment of the camera's shooting angle and shooting distance to achieve the best shooting effect, thereby enabling accurate detection of cracks on the wind turbine blade surface. This avoids blade breakage due to undetected cracks, thus preventing high maintenance costs and wind turbine downtime losses. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of the wind turbine blade surface crack detection device of this utility model;

[0008] Figure 2 This is a schematic diagram of the camera connection device in the wind turbine blade surface crack detection device of this utility model;

[0009] Figure 3 This is a schematic diagram of the suction cup cylinder, the first connecting cylinder, or the second connecting cylinder in the wind turbine blade surface crack detection device of this utility model.

[0010] Figure 4 This is a schematic diagram of the sliding cylinder in the wind turbine blade surface crack detection device of this utility model;

[0011] Figure 5 This is a schematic diagram of the structure of the first slide bar support block, the second slide bar support block, the third slide bar support block, or the fourth slide bar support block in the wind turbine blade surface crack detection device of this utility model.

[0012] Figure 6 This is a schematic diagram of the worm gear structure in the wind turbine blade surface crack detection device of this utility model;

[0013] Figure 7 This is a schematic diagram of the structure of the first slide bar or the second slide bar in the wind turbine blade surface crack detection device of this utility model;

[0014] Figure 8 This is a schematic diagram of the structure of the first or second slider in the wind turbine blade surface crack detection device of this utility model;

[0015] Figure 9 This is a schematic diagram of the motor mounting plate in the wind turbine blade surface crack detection device of this utility model;

[0016] Figure 10 This is a schematic diagram of the structure of the first frame in the wind turbine blade surface crack detection device of this utility model;

[0017] Figure 11 This is a schematic diagram of the structure of the second frame in the wind turbine blade surface crack detection device of this utility model;

[0018] Figure 12 This is a schematic diagram of the connecting plate in the wind turbine blade surface crack detection device of this utility model;

[0019] Figure 13 This is a schematic diagram of the worm gear in the wind turbine blade surface crack detection device of this utility model;

[0020] Figure 14 This is a schematic diagram of the suction cup mounting plate in the wind turbine blade surface crack detection device of this utility model;

[0021] Figure 15 This is a schematic diagram of the suction cup structure in the wind turbine blade surface crack detection device of this utility model;

[0022] Figure 16 This is a schematic diagram of the sliding connecting plate in the wind turbine blade surface crack detection device of this utility model;

[0023] Figure 17 This is a schematic diagram of the camera mounting rod in the wind turbine blade surface crack detection device of this utility model;

[0024] Figure 18 This is a cross-sectional view of the camera mounting rod in the wind turbine blade surface crack detection device of this utility model. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] This embodiment provides a wind turbine blade surface crack detection device, including a support frame, a suction cup 1, a camera 2, a microprocessor control module, a communication module, and a circuit board. The suction cup 1 is disposed at the bottom periphery of the support frame; the camera 2 is disposed at the bottom center of the support frame; both the microprocessor control module and the communication module are disposed on the circuit board, which is fixed to the support frame; the camera 2 and the communication module are both electrically connected to the microprocessor control module through the circuit board. Those skilled in the art will understand that the suction cup 1 at the bottom periphery of the support frame allows the wind turbine blade surface crack detection device provided in this embodiment to be more firmly attached to the surface of the wind turbine blade, facilitating the acquisition of wind turbine blade surface images by the camera 2 for data processing and analysis; the microprocessor control module is used to control and process data signals of the wind turbine blade surface crack detection device provided in this embodiment; the communication module, under the control of the microprocessor controller, sends the detected data signals to a remote server for data analysis and storage.

[0027] Furthermore, the wind turbine blade surface crack detection device provided in this embodiment also includes a suction cup cylinder 3, which is disposed at the bottom of the periphery of the support frame; the suction cup 1 is fixed to the actuator of the suction cup cylinder 3. Those skilled in the art will understand that this allows the distance between the suction cup 1 and the support frame to be adjusted by the cylinder, thereby adapting to the shape of the current detection position of the wind turbine blade, making the wind turbine blade surface crack detection device provided in this embodiment more firmly adhered to the surface of the wind turbine blade.

[0028] Furthermore, the support frame includes a first frame 4 and a second frame 5; the first frame 4 and the second frame 5 are slidably connected; each of the first frame 4 and the second frame 5 is provided with a suction cup 1 and a suction cup cylinder 3 at its bottom. Those skilled in the art will understand that the first frame 4 and the second frame 5 are respectively adsorbed onto the surface of the wind turbine blade by the suction cups 1 provided at their respective bottoms; when the first frame 4 remains adsorbed, the second frame 5 can release the adsorption and, by sliding, change its relative position with the first frame 4 before re-adsorbing onto the surface of the wind turbine blade; at this time, the first frame 4 can again release the adsorption and, by sliding, change its position with the second frame 5 before re-adsorbing onto the surface of the wind turbine blade; thus, the first frame 4 and the second frame 5 alternately change their relative positions by sliding, thereby enabling the wind turbine blade surface crack detection device provided in this embodiment to move on the wind turbine blade wrapping surface.

[0029] Furthermore, the first frame 4 is a plate-shaped triangular star including a first end 401, a second end 402, and a third end 403; the second frame 5 is a plate-shaped triangular star including a fourth end 501, a fifth end 502, and a sixth end 503; a suction cylinder 3 mounting bracket is fixed to the bottom of each of the first end 401, the second end 402, the third end 403, the fourth end 501, the fifth end 502, and the sixth end 503; the number of suction cylinders 3 is 6, and the 6 suction cylinders 3 are respectively fixed to the bottom of the first end 401, the second end 402, the third end 403, the fourth end 501, the fifth end 502, and the sixth end 503 by the suction cylinder 3 mounting bracket. Those skilled in the art will understand that setting both the first frame 4 and the second frame 5 as triangular stars makes the structure more stable, which on the one hand facilitates the smooth movement of the wind turbine blade surface crack detection device provided in this embodiment on the wind turbine blade surface; on the other hand, ensures that the image captured by the camera 2 has less shaking and better image signal quality.

[0030] Furthermore, the wind turbine blade surface crack detection device provided in this embodiment also includes a sliding connection device; the sliding connection device includes a sliding connection plate 6, a sliding cylinder 7, a first slide rod 8, a second slide rod 9, a first slider 10, a second slider 11; a first slide rod support block 12, a second slide rod support block 13, a third slide rod support block 14, and a fourth slide rod support block 15; the sliding connection plate 6 is fixed to the top of the second frame 5; the first slide rod support block 12 and the second slide rod support block 13 are fixed to the bottom of the first frame 4; the first slide rod support block 12 and the second slide rod support block 13... The third slide rod support block 14 and the fourth slide rod support block 15 are fixed to the top of the sliding connecting plate 6; the first slide rod 8 passes through the first slider 10 and its two ends are respectively fixed to the first slide rod support block 12 and the second slide rod support block 13; the second slide rod 9 passes through the second slider 11 and its two ends are respectively fixed to the third slide rod support block 14 and the fourth slide rod support block 15; the sliding cylinder 7 is fixed to the top of the sliding connecting plate 6; the actuating end of the sliding cylinder 7 is fixed to the bottom of the first frame 4; the sliding cylinder 7, the first slide rod 8 and the second slide rod 9 are all arranged in parallel. Those skilled in the art will understand that the first frame 4 and the second frame 5 are connected to each other through the sliding connecting device, thereby realizing the sliding connection between the first frame 4 and the second frame 5, and thus enabling the wind turbine blade surface crack detection device provided in this embodiment to move on the surface of the wind turbine blade.

[0031] Furthermore, the wind turbine blade surface crack detection device provided in this embodiment also includes a camera connection device. The camera connection device includes a camera mounting rod 16, the top end of which is fixed to the bottom of the second frame 5. The camera mounting rod 16 is a tubular structure with an internal cavity. The camera 2 is installed at the bottom of the camera mounting rod 16. The circuit board is installed inside the cavity. Those skilled in the art will understand that the wind turbine blade surface crack detection device provided in this embodiment also includes a rechargeable battery, which is also installed inside the cavity.

[0032] Furthermore, the camera connection device also includes a first connecting cylinder 17, a second connecting cylinder 18, and a connecting plate 19; the camera mounting rod 16 includes a first tube portion 1601, a second tube portion 1602, and a third tube portion 1603; the first tube portion 1601, the second tube portion 1602, and the third tube portion 1603 are sequentially sleeved from the outside to the inside to form a telescopic structure; the camera 2 is installed at the bottom of the third tube portion 1603; a first mounting hole is provided at the center of the connecting plate 19; the third tube portion 1603 passes through the first mounting hole and is fixed to the connecting plate 19; the first connecting cylinder 17 and the second connecting cylinder 18 are fixed to the bottom of the second frame 5; the actuating end of the first connecting cylinder 17 and the actuating end of the second connecting cylinder 18 are both fixed to the connecting plate 19. Those skilled in the art will understand that the distance between the connecting plate 19 and the second frame 5 can be adjusted by the first connecting cylinder 17 and the second connecting cylinder 18, thereby causing the second tube and the third tube to pull against each other, thereby changing the length of the camera mounting rod 16, and thus changing the distance between the camera 2 and the surface of the fan blade, so as to adapt to the optimal image shooting distance.

[0033] Furthermore, the camera connection device also includes a pneumatic motor 20, a worm gear 21, a worm wheel 22, and a motor mounting plate 23. The pneumatic motor 20 and the motor mounting plate 23 are both fixed to the bottom of the second frame 5. The motor mounting plate 23 has a second mounting hole 24, through which the actuating end of the pneumatic motor 20 passes and is fixed to the worm gear 21. The worm wheel 22 is fixedly sleeved on the outer wall of the first tube portion 1601. The worm wheel 22 and the worm gear 21 mesh with each other. The camera mounting rod 16 also includes a shaft 25, with the first tube portion 1601 sleeved on the shaft 25. The shaft 25 is fixed to the bottom of the second frame 5. Those skilled in the art will understand that when the actuating end of the pneumatic motor 20 moves, it drives the worm gear 21 to move, thereby driving the worm wheel 22 to rotate. Since the worm wheel 22 is fixedly sleeved on the outer wall of the first tube portion 1601, the worm wheel 22 drives the first tube portion to rotate.

[0034] Furthermore, both the inner walls of the first tube portion 1601 and the second tube portion 1602 are provided with limiting grooves 26; the outer walls of the second and third tube portions are provided with limiting blocks 27 that match the limiting grooves 26. Those skilled in the art will understand that, through the cooperation of the limiting blocks 27 and the limiting grooves 26, when the first tube portion 1601 rotates under the drive of the worm gear 22, the first tube portion 1601 drives the second tube portion 1602 and the third tube portion 1603 to rotate, thereby achieving the rotation of the camera 2 to achieve the optimal image capture angle.

[0035] Furthermore, the wind turbine blade surface crack detection device provided in this embodiment also includes six suction cup mounting plates 28, each suction cup mounting plate 28 being triangular star-shaped. The six suction cup mounting plates 28 are respectively fixed to the actuating ends of six suction cup cylinders 3; three suction cups 1 are mounted on the bottom of each suction cup mounting plate 28. Those skilled in the art will understand that mounting three suction cups 1 on the bottom of each suction cup mounting plate 28 allows the wind turbine blade surface crack detection device provided in this embodiment to adhere to the wind turbine blade surface using more suction cups 1, resulting in a more stable adsorption effect. Furthermore, by setting the suction cup mounting plates 28 to a triangular star shape, the three suction cups 1 form a stable structure, further enhancing the stability of the adsorption.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A wind turbine blade surface crack detection apparatus, characterized by, It includes support frame, suction cup (1), camera (2), micro processing control module, communication module and circuit board; the suction cup (1) is arranged at the bottom of the periphery of the support frame; the camera (2) is arranged at the bottom of the center of the support frame; the micro processing control module and the communication module are arranged on the circuit board, and the circuit board is fixed with the support frame; the camera (2) and the communication module are electrically connected with the micro processing control module through the circuit board.

2. The fan blade surface crack detection apparatus of claim 1, wherein It also includes suction cup cylinder (3), the suction cup cylinder (3) is arranged at the bottom of the periphery of the support frame; the suction cup (1) is fixed with the execution part of the suction cup cylinder (3).

3. The fan blade surface crack detection apparatus of claim 2, wherein The support frame includes first frame body (4) and second frame body (5); the first frame body (4) and the second frame body (5) are slidingly connected; the bottom of the first frame body (4) and the second frame body (5) is provided with suction cup (1) and suction cup cylinder (3).

4. The fan blade surface crack detection apparatus of claim 3, wherein The first frame body (4) is a plate-shaped triangular star shape including first end (401), second end (402) and third end (403); the second frame body (5) is a plate-shaped triangular star shape including fourth end (501), fifth end (502) and sixth end (503); the bottom of the first end (401), the second end (402), the third end (403), the fourth end (501), the fifth end (502) and the sixth end (503) is fixed with a suction cup cylinder (3) mounting frame; the number of the suction cup cylinder (3) is six, and the six suction cup cylinders (3) are respectively fixed on the bottom of the first end (401), the second end (402), the third end (403), the fourth end (501), the fifth end (502) and the sixth end (503) through the suction cup cylinder (3) mounting frame.

5. The fan blade surface crack detection apparatus of claim 4, wherein It also includes a sliding connection device; the sliding connection device includes a sliding connecting plate (6), a sliding cylinder (7), a first sliding rod (8), a second sliding rod (9), a first slider (10), a second slider (11); a first sliding rod support block (12), a second sliding rod support block (13), a third sliding rod support block (14), and a fourth sliding rod support block (15); the sliding connecting plate (6) is fixed to the top of the second frame (5); the first sliding rod support block (12) and the second sliding rod support block (13) are fixed to the bottom of the first frame (4); the first sliding rod support block (12), the second sliding rod support block (13), the third sliding rod support block (14), and the fourth sliding rod support block (15) are fixed to the bottom of the first frame (4); the first sliding rod support block (12), the second sliding rod support block (13), the third sliding rod support block (14), and the fourth sliding rod support block (15) are fixed to the bottom of the first frame (4). The four slide bar support block (15) is fixed to the top of the sliding connecting plate (6); the first slide bar (8) passes through the first slider (10) and its two ends are respectively fixed to the first slide bar support block (12) and the second slide bar support block (13); the second slide bar (9) passes through the second slider (11) and its two ends are respectively fixed to the third slide bar support block (14) and the fourth slide bar support block (15); the sliding cylinder (7) is fixed to the top of the sliding connecting plate (6); the actuating end of the sliding cylinder (7) is fixed to the bottom of the first frame (4); the sliding cylinder (7), the first slide bar (8) and the second slide bar (9) are all arranged in parallel.

6. The fan blade surface crack detection apparatus of claim 5, wherein It also includes a camera connection device, which includes a camera mounting rod (16), the top of which is fixed to the bottom of the second frame (5); the camera mounting rod (16) is a tubular structure with an internal cavity; the camera (2) is installed at the bottom of the camera mounting rod (16); and the circuit board is installed in the cavity.

7. The fan blade surface crack detection apparatus of claim 6, wherein The camera connection device further includes a first connecting cylinder (17), a second connecting cylinder (18), and a connecting plate (19); the camera mounting rod (16) includes a first tube part (1601), a second tube part (1602), and a third tube part (1603); the first tube part (1601), the second tube part (1602), and the third tube part (1603) are sequentially sleeved from the outside to the inside to form a telescopic structure; the camera (2) is installed at the bottom of the third tube part (1603); a first mounting hole is provided at the center of the connecting plate (19); the third tube part (1603) passes through the first mounting hole and is fixed to the connecting plate (19); the first connecting cylinder (17) and the second connecting cylinder (18) are fixed to the bottom of the second frame (5); the actuating end of the first connecting cylinder (17) and the actuating end of the second connecting cylinder (18) are both fixed to the connecting plate (19).

8. The fan blade surface crack detection apparatus of claim 7, wherein, The camera connection device also includes a pneumatic motor (20), a worm gear (21), a worm wheel (22), and a motor mounting plate (23). The pneumatic motor (20) and the motor mounting plate (23) are both fixed to the bottom of the second frame (5). The motor mounting plate (23) is provided with a second mounting hole (24). The actuating end of the pneumatic motor (20) passes through the second mounting hole (24) and is fixed to the worm gear (21). The worm wheel (22) is fixedly sleeved on the outer wall of the first tube part (1601). The worm wheel (22) and the worm gear (21) mesh with each other to form a connection. The camera mounting rod (16) also includes a shaft (25). The first tube part (1601) is sleeved on the shaft (25). The shaft (25) is fixed to the bottom of the second frame (5).

9. The fan blade surface crack detection apparatus of claim 8, wherein, The inner walls of the first tube section (1601) and the second tube section (1602) are provided with limiting grooves (26); the outer walls of the second tube and the third tube are provided with limiting blocks (27) that match the limiting grooves (26).

10. The fan blade surface crack detection apparatus of claim 9, wherein, It also includes 6 suction cup mounting plates (28), which are triangular star-shaped. The 6 suction cup mounting plates (28) are respectively fixed to the execution ends of 6 suction cup cylinders (3); 3 suction cups (1) are installed at the bottom of each suction cup mounting plate (28).

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