Wind power blade detection device

Abstract

The invention belongs to the technical field of wind power blade detection, and discloses a wind power blade detection device which is characterized in that a remote control chassis is electrically connected with a console through an anti-drawing cable, a flat plate is mounted on the remote control chassis, a fixed housing is fixedly arranged at the top of the flat plate, an auxiliary housing is rotatably mounted on the inner side of an opening of the fixed housing, and a linear driving mechanism is arranged at the top of the flat plate; one end of the linear driving mechanism extends into the fixed housing and is in transmission connection with the holder camera and the auxiliary housing; the remote control chassis is operated to move in the wind power blade through the console, the internal state of the blade is shot, when the remote control chassis accidentally turns on one side, the linear driving mechanism drives the auxiliary housing to rotate to seal the opening of the fixed housing, and the pan-tilt camera moves into the fixed housing; the pan-tilt camera is prevented from being collided in the process that the pan-tilt camera is dragged out of the blade through the anti-drawing cable, when the internal state of the blade needs to be shot, the auxiliary housing is driven by the linear driving mechanism to rotate to open the opening of the fixed housing, and the pan-tilt camera is moved out of the interior of the fixed housing.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind turbine blade detection technology, and in particular to a wind turbine blade detection device. BACKGROUND

[0002] The blade is one of the core components of the wind turbine generator set, and once an accident occurs, it will result in heavy losses. In the production process, due to the deformation of the tooling mold, the deformation of the parts, the random factors of the manufacturing process and the influence of human factors, defects such as pores, cracks, delamination and lack of glue are inevitable in the blade. In the process of transportation, hoisting and operation, the blade structure may be damaged due to accidental impact, protective layer falling off and other reasons.

[0003] Due to the narrow space inside the wind turbine blade, personnel cannot enter, so currently an endoscopic robot is usually used to enter the inside of the blade for detection, which moves inside the wind turbine blade under the control of the console and uses a camera to take pictures of the inside of the wind turbine blade, replacing manual visual inspection of the wind turbine blade. The camera collects image data inside the wind turbine blade and uploads it to the edge computer of the console for identification. However, due to the lack of protection for the camera during use, when the robot rolls over inside the wind turbine blade, it is usually necessary to pull the traction rope or cable to drag the robot out of the wind turbine blade. In this process, the exposed camera is prone to collision and damage. SUMMARY

[0004] The purpose of the present application is to provide a wind turbine blade detection device that can take pictures inside the wind turbine blade and also avoid knocking the gimbal camera during the dragging process.

[0005] To achieve this purpose, the following technical solutions are used: A wind turbine blade detection device, comprising a remote control chassis, the remote control chassis is electrically connected with the console through the anti-pulling cable, a flat plate is installed on the remote control chassis, a fixed cover shell is fixedly arranged on the top of the flat plate, a secondary cover shell is rotatably arranged on the inside of the opening of the fixed cover shell, a linear drive mechanism is arranged on the top of the flat plate, one end of the linear drive mechanism extends into the fixed cover shell, and the linear drive mechanism is drivingly connected with a gimbal camera and the secondary cover shell. The linear drive mechanism is configured to drive the gimbal camera to move into the fixed cover shell, and the secondary cover shell rotates to close the opening of the fixed cover shell; or, drive the gimbal camera to move out of the fixed cover shell, and the secondary cover shell rotates to open the opening of the fixed cover shell.

[0006] As preferred, the linear driving mechanism comprises a frame, a screw rod, a driving member and a screw sleeve, the frame is arranged on the top of the flat plate, the screw rod is rotatably arranged in the interior of the frame, the driving member is installed on the frame and the output end of the driving member is connected with the end of the screw rod, the screw sleeve is screwed on the screw rod, and the holder is connected with the screw sleeve.

[0007] As preferred, the corner of each of the two side walls of the secondary cover shell is fixedly provided with a half gear, the opposite sides in the interior of the fixed cover shell are fixedly provided with guide sleeves, the guide sleeves are provided with springs, the open ends of the guide sleeves are slidably provided with sliding rods, one end of the sliding rod abuts against the spring, the top of the sliding rod is fixedly connected with a gear rack, the top of the guide sleeve is provided with an open slot along the length direction of the guide sleeve, the gear rack is slidably arranged in the corresponding open slot, the two gear racks are engaged with the two half gears respectively, and the screw sleeve is connected with two push rods.

[0008] As preferred, the half gears are coaxially fixedly provided with rotating shafts, and the two rotating shafts are rotatably connected with the two sides of the fixed cover shell respectively.

[0009] As preferred, the linear driving mechanism further comprises a sliding seat, the sliding seat is sleeved on the screw sleeve, and the top of the frame is provided with two long holes which are spaced apart along the width direction of the frame, the two push rods are respectively inserted into the two long holes and connected with the sliding seat.

[0010] As preferred, the interior of the frame is provided with two guide rods, the guide rods are arranged along the length direction of the frame, the sliding seat is provided with two guide holes, and the two guide rods are respectively arranged in the two guide holes.

[0011] As preferred, the two guide rods are symmetrically arranged on the two sides of the screw rod.

[0012] As preferred, the interior of the fixed cover shell is fixedly provided with a blocking strip which is away from the push rods, and the blocking strip is located on the moving path of the secondary cover shell.

[0013] As preferred, one end of the sliding rod which is away from the spring is fixedly provided with a rubber buffer pad.

[0014] As preferred, one end of the frame which is close to the fixed cover shell is installed with a position sensor, and the position sensor is electrically connected with the control console.

[0015] The beneficial effects of the present application are as follows: This invention provides a wind turbine blade inspection device, including a remote control chassis. The remote control chassis is electrically connected to a control console via a tensile-resistant cable. A flat plate is mounted on the remote control chassis, and a fixed cover is fixedly installed on the top of the flat plate. A secondary cover is rotatably installed inside the opening of the fixed cover. A linear drive mechanism is provided on the top of the flat plate, with one end of the linear drive mechanism extending into the fixed cover and drivingly connecting a gimbal camera to the secondary cover. By operating the remote control chassis through the control console, the remote control chassis can be moved inside the wind turbine blade to photograph its internal condition. If the remote control chassis accidentally tips over, the linear drive mechanism drives the secondary cover to rotate and close the opening of the fixed cover, moving the gimbal camera inside the fixed cover. This protects the gimbal camera from impacts during the process of pulling it out of the blade using the tensile-resistant cable, effectively protecting the gimbal camera. When it is necessary to photograph the internal condition of the blade, the linear drive mechanism drives the secondary cover to rotate and open the opening of the fixed cover, moving the gimbal camera out of the fixed cover so that it can be easily removed. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a wind turbine blade testing device provided in an embodiment of the present invention; Figure 2 yes Figure 1 A partial sectional view; Figure 3 This is a schematic diagram of the linear drive mechanism provided in an embodiment of the present invention; Figure 4 yes Figure 2 A magnified view of a portion of the image.

[0017] In the picture: 1. Remote control chassis; 2. Anti-pull-out cable; 3. Flat plate; 4. Fixed cover; 41. Guide sleeve; 42. Spring; 43. Slider; 44. Rack; 441. Opening slot; 45. Stop bar; 5. Secondary cover; 51. Half gear; 52. Rotating shaft; 6. Gimbal camera; 71. Frame; 711. Guide rod; 72. Screw; 73. Drive component; 74. Screw sleeve; 75. Push rod; 76. Slide; 761. Guide hole; 762. Through hole; 8. Spring shock absorber; 9. Infrared obstacle avoidance sensor. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0019] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0022] This embodiment provides a wind turbine blade inspection device that can photograph the inside of wind turbine blades, replacing manual visual inspection of wind turbine blades. It can also protect the gimbal camera in time, avoiding damage to the gimbal camera during dragging.

[0023] Please see Figures 1 to 4 The wind turbine blade detection device provided in this embodiment includes a remote control chassis 1. The remote control chassis 1 is electrically connected to the control console via a tensile-resistant cable 2. By operating the remote control chassis 1 through the control console, the remote control chassis 1 can be moved inside the wind turbine blade to take pictures of the internal state of the blade. If the remote control chassis 1 accidentally overturns, it can be pulled out of the blade using the tensile-resistant cable 2.

[0024] Furthermore, a flat plate 3 is mounted on the remote control chassis 1, a fixed cover 4 is fixed on the top of the flat plate 3, and a secondary cover 5 is rotatably mounted inside the opening of the fixed cover 4. A linear drive mechanism is set on the top of the flat plate 3, one end of the linear drive mechanism extends into the fixed cover 4, and the linear drive mechanism drives the gimbal camera 6 and the secondary cover 5.

[0025] With the above settings, when the remote control chassis 1 accidentally tips over, the gimbal camera 6 is moved into the interior of the fixed housing 4 by the linear drive mechanism. During this process, the linear drive mechanism drives the secondary housing 5 to rotate, closing the opening of the fixed housing 4, so that the gimbal camera 6 is covered inside the fixed housing 4 and the secondary housing 5. This can prevent the gimbal camera 6 from being bumped during the process of pulling it out of the blade using the anti-pull cable 2, and effectively protect the gimbal camera 6. When it is necessary to shoot the internal state of the blade, the gimbal camera 6 is moved out of the fixed housing 4 by the linear drive mechanism. During this process, the linear drive mechanism drives the secondary housing 5 to rotate into the fixed housing 4, opening the opening of the fixed housing 4, so that the gimbal camera 6 can be moved out smoothly.

[0026] In a feasible embodiment, the remote control chassis 1 is a rubber track chassis, and the surface of its rubber track is provided with anti-slip texture. By replacing the traditional wheel chassis with a rubber track chassis (track width 100mm, pitch 15mm), the coefficient of friction can be effectively improved, and it can easily cross protruding obstacles with a height ≤30mm (such as internal reinforcing ribs of blades), increasing the pass rate from the original 70% to 98%. Furthermore, a three-axis gyroscope (measurement range ±180°, accuracy ±0.1°) is installed on the remote control chassis 1. The three-axis gyroscope is used to monitor the attitude of the remote control chassis 1 in real time. When the tilt angle of the remote control chassis 1 is detected to be ≥45° (determined to be overturned), a "overturning signal" is immediately sent to the control console. The control console automatically starts the protection program without manual operation, and the response time is shortened from the original 10-15 seconds to 1-2 seconds.

[0027] In a feasible embodiment, please refer to Figures 1 to 2 The flat plate 3 is connected to the remote control chassis 1 via multiple spring shock absorbers 8. Multiple spring shock absorbers 8 (damping coefficient 50N) are added. The spring damper 8 (s / m) can reduce the impact of vibration on the gimbal camera 6 and other components during the movement of the remote control chassis 1. When the remote control chassis 1 passes through uneven areas, the spring damper 8 can absorb more than 60% of the vibration, ensuring the stability of the image captured by the gimbal camera 6 (image shake ≤ 0.5mm). In addition, adjustable support wheels (not shown in the figure) can be added to both sides of the remote control chassis 1. The extension and retraction stroke of the support wheels is 20-50mm. The extension and retraction of the support wheels can be remotely controlled by the control console to adjust the level of the remote control chassis 1, thereby reducing the probability of the remote control chassis 1 tipping over due to the tilt of the blades.

[0028] Furthermore, the gimbal camera 6 features 360° rotation and utilizes existing mature technologies such as high-definition lenses, autofocus modules, and wide-angle distortion correction to ensure image clarity. It can also adapt to narrow spaces (0.3-1.2m wide) and curved sections within the blades, expanding the field of view by 30% and preventing missed shots due to insufficient lens angle. The lens surface of the gimbal camera 6 is coated with a nano dustproof and waterproof coating (IP65 protection rating) to deal with sand and condensation inside the blades, solving the problem of the gimbal camera 6 lens being easily dirty and producing blurry images, extending the lens cleaning cycle from once every 2 hours to once every 8 hours.

[0029] In feasible embodiments, the gimbal camera 6 is also equipped with an infrared thermal imager and an ultrasonic sensor. The infrared thermal imager (resolution 320×240) is used to detect "temperature abnormal areas" inside the blade. Because the heat conduction efficiency at cracks and delamination is significantly different from that of normal areas, it can identify "hidden internal defects" that cannot be detected by vision (such as delamination with a depth ≤5mm). The ultrasonic sensor (detection distance 50-300mm) is used to determine the thickness change of the inner wall of the blade through ultrasonic reflected waves, and assists in locating the "glue-deficient area" inside the blade (the thickness of the glue-deficient area is 10%-20% thinner than that of the normal area), thereby improving the defect identification accuracy from the original 85% to more than 95%.

[0030] Further, please refer to Figures 1 to 2 Infrared obstacle avoidance sensors 9 (detection distance 50-200mm) are installed on the front of the tablet 3 and on both sides of the remote control chassis 1 to scan obstacles in front of and on both sides of the remote control chassis 1 in real time. If an obstacle ≤50mm is detected, the control console automatically decelerates (from 0.1m / s to 0.02m / s) and adjusts the direction of movement to avoid direct collision that could cause the remote control chassis 1 to tip over or damage to components.

[0031] For example, the tensile-resistant cable 2 adopts a composite structure of copper core conductivity + optical fiber transmission. Its copper core part (cross-sectional area 2.5mm²) is responsible for power supply, ensuring stable power supply over long distances (≤100m). The optical fiber part (core diameter 50μm) supports real-time transmission of 4K high-definition images and sensor data, with a transmission rate ≥1Gbps and a latency ≤100ms, to avoid problems such as image stuttering and data loss. Furthermore, the outer layer of the tensile-resistant cable 2 adopts a composite structure of "nylon braided tensile layer + PVC wear-resistant layer", with a tensile strength ≥5000N and wear resistance ≥1000 times (drag), resulting in a longer service life.

[0032] Optionally, the control console uses a 12-inch touchscreen (1920×1080 resolution) + dual joystick controller. The touchscreen can display the real-time image (left side) and defect annotations (right side) in split screen, allowing operators to view them simultaneously without switching interfaces. Furthermore, a path preset function has been added to the software – after importing the 3D model of the wind turbine blade, the control console automatically generates the optimal inspection path (covering 99% of the blade's inner wall area), and the remote control chassis 1 moves automatically according to the preset path, reducing the intensity of manual operation. Further, in terms of data processing, through the built-in edge computing module (2 TOPS computing power), the data from the gimbal camera 6, infrared thermal imager, and ultrasonic sensor can be fused and analyzed in real time, automatically annotating defect types (such as cracks, pores, delamination), dimensions (error ≤1mm), and generating inspection reports (supporting Excel / PDF export), improving inspection efficiency by 40%.

[0033] In some feasible embodiments, please refer to Figures 1 to 4 The linear drive mechanism includes a frame 71, a screw 72, a drive component 73, and a screw sleeve 74. The frame 71 is located on the top of the plate 3. The screw 72 is rotatably inserted into the frame 71; preferably, the screw 72 is arranged along the length of the frame 71. The drive component 73 is mounted on the frame 71, and its output end is connected to the end of the screw 72. The screw sleeve 74 is screwed onto the screw 72, and the gimbal camera 6 is connected to the screw sleeve 74.

[0034] With the above settings, the drive unit 73 is activated, which drives the screw 72 to rotate. Through the screw sleeve 74, the gimbal camera 6 can be moved along the screw 72 to move the gimbal camera 6 into or out of the fixed cover 4.

[0035] In this embodiment, a position sensor is also installed at one end of the frame 71 near the fixed cover 4. Preferably, a photoelectric position sensor (detection accuracy ±0.05mm) is selected and electrically connected to the control console. When the gimbal camera 6 moves into position, the position sensor triggers a signal, and the drive component 73 stops immediately to avoid the gimbal camera 6 from hitting the inside of the fixed cover 4 due to excessive rotation of the screw 72.

[0036] Optionally, the linear drive mechanism also includes a slide 76, which is slidably connected within the frame 71. Specifically, the slide 76 is fitted and fixed to the outer wall of the threaded sleeve 74, and the bottom of the gimbal camera 6 is fixedly connected to the slide 76. Furthermore, a through hole 762 can be coaxially formed in the slide 76, and the threaded sleeve 74 can be fixedly installed within the through hole 762.

[0037] Optionally, please refer to Figure 3The frame 71 has two guide rods 711 inside, which are arranged along the length of the frame 71. A slide 76 has two guide holes 761 through which it passes. The two guide rods 711 are respectively inserted into the two guide holes 761. The sliding engagement between the guide rods 711 and the guide holes 761 improves the stability of the slide 76 within the frame 71. Preferably, the two guide rods 711 are symmetrically arranged on both sides of the screw 72.

[0038] In some feasible embodiments, please refer to Figure 4 Half gears 51 are fixed at the corners of the two side walls of the secondary cover 5. Guide sleeves 41 are fixed on opposite sides inside the fixed cover 4. Springs 42 are installed inside the guide sleeves 41. Sliding strips 43 slide through the open end of the guide sleeves 41, and one end of the sliding strips 43 abuts against the springs 42. Further, racks 44 are fixedly connected to the top of the sliding strips 43. Appropriately, an opening slot 441 is opened along the length direction of the top of the guide sleeves 41 so that the racks 44 can slide through the opening slots 441 of the corresponding guide sleeves 41. Two racks 44 are set to mesh with two half gears 51 one by one. Further, two push rods 75 are connected to the top of the screw sleeve 74. The two push rods 75 can move along the screw 72 under the drive of the screw sleeve 74, thereby pushing the two sliding strips 43 to compress the corresponding springs 42 respectively.

[0039] For example, in this embodiment, two elongated holes are provided at intervals along the width direction on the top of the frame 71, and two push rods 75 extend into the two elongated holes and are connected to the top of the slide 76.

[0040] Preferably, both half gears 51 are coaxially fixed with rotating shafts 52, and the two rotating shafts 52 are rotatably connected to both sides of the fixed cover 4, thereby realizing that the secondary cover 5 is rotatably connected to the fixed cover 4.

[0041] With the above configuration, when the slide block 76 moves out of the fixed cover 4 under the drive of the screw 72, it will simultaneously drive the two push rods 75 away from the slide bar 43. At this time, the slide bar 43, under the push of the spring 42, drives the rack 44 to slide out of the guide sleeve 41. Thus, by utilizing the cooperation of the rack 44 and the half gear 51, the auxiliary cover 5 is driven to rotate and open the opening of the fixed cover 4, so that the gimbal camera 6 can be smoothly moved out of the fixed cover 4. When the slide block 76 drives the gimbal camera 6 into the fixed cover 4, the two push rods 75 will contact the end of the corresponding slide bar 43 and push the slide bar 43 and the rack 44 to move into the corresponding guide sleeve 41 to compress the spring 42. By utilizing the cooperation of the rack 44 and the half gear 51, the auxiliary cover 5 is driven to rotate and close the opening of the fixed cover 4. It should be noted that when the gimbal camera 6 reaches the preset position inside the fixed cover 4, the auxiliary cover 5 rotates into place, which can completely cover the gimbal camera 6 inside the auxiliary cover 5 and the fixed cover 4.

[0042] Optionally, a stop bar 45 is fixed inside the fixed housing 4 on the side opposite to the push rod 75, and the stop bar 45 is located on the moving path of the secondary housing 5. When the gimbal camera 6 reaches the preset position inside the fixed housing 4, the secondary housing 5 rotates until one end abuts against the stop bar 45, preventing it from rotating further. This, combined with the meshing of the half gear 51 and the rack 44, prevents the rack 44 and the slide bar 43 from being pushed out of the guide sleeve 41 by the spring 42. For example, at least two stop bars 45 are fixed inside the fixed housing 4 on the side opposite to the push rod 75, and all the stop bars 45 are located on the moving path of the secondary housing 5.

[0043] Optionally, the preload of spring 42 is set to 8-12N, which can both counteract the meshing resistance (approximately 3-5N) between rack 44 and half gear 51, ensuring that when slide 76 moves gimbal camera 6 outwards from fixed cover 4, spring 42 can push slide bar 43 and rack 44 to link half gear 51, causing secondary cover 5 to rotate and open the opening of fixed cover 4, and also avoid excessive preload leading to increased load on drive component 73, affecting the movement accuracy of slide 76.

[0044] Furthermore, a rubber buffer pad can be fixed to the end of the slider 43 away from the spring 42 with glue (such as epoxy resin). The rubber buffer pad is made of nitrile rubber with a thickness of 3-5mm and a Shore hardness of 40-50. When the push rod 75 contacts the slider 43, the rubber buffer pad can absorb more than 60% of the impact force, reduce the direct collision between the push rod 75 and the slider 43, avoid deformation of the ends of both, and ensure the stability of the transmission trigger.

[0045] Furthermore, polyurethane gaskets with a thickness of 2-3mm and a Shore hardness of 35-40 are installed at both ends of the spring 42. The outer diameter of the polyurethane gasket is adapted to the inner diameter of the guide sleeve 41, and the gap between the polyurethane gasket and the guide sleeve 41 is ≤0.5mm. The polyurethane gaskets isolate the spring 42 from direct contact with the inner wall of the guide sleeve 41 and the end of the slide bar 43, preventing metal wear and deformation at the end of the spring 42 during long-term compression and tension, ensuring the reset accuracy of the spring 42, and avoiding jamming of the secondary cover 5 due to the failure of the spring 42.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A wind turbine blade inspection device, characterized in that, The utility model provides a remote control chassis (1) is electrically connected with the control platform through the anti -pull cable (2), and the remote control chassis (1) is installed with the tablet (3) on, the top of tablet (3) is fixed with fixed cover (4), the inside of the opening of fixed cover (4) is rotatably installed vice cover (5), the top of tablet (3) is provided linear drive mechanism, one end of linear drive mechanism stretches into fixed cover (4), and linear drive mechanism transmission connection cloud platform camera (6) with vice cover (5); Linear drive mechanism is configured to drive cloud platform camera (6) moves into fixed cover (4), vice cover (5) rotates and closes the opening of fixed cover (4);Or, drive cloud platform camera (6) moves out of fixed cover (4), vice cover (5) rotates and opens the opening of fixed cover (4).

2. A wind turbine blade inspection device according to claim 1, wherein, Linear drive mechanism includes frame (71), screw rod (72), drive part (73) and screw sleeve (74), frame (71) is arranged on the top of tablet (3), screw rod (72) is rotatably inserted in the inside of frame (71), drive part (73) is installed on frame (71), and its output end is connected with the end of screw rod (72), screw sleeve (74) is screwed on screw rod (72), and cloud platform camera (6) is connected with screw sleeve (74).

3. A wind turbine blade inspection device according to claim 2, wherein, The corner of the two side walls of the vice cover (5) is fixed with a half gear (51), and the opposite sides in the fixed cover (4) are fixed with a guide sleeve (41). The guide sleeve (41) is provided with a spring (42) inside. The opening end of the guide sleeve (41) is slidably provided with a sliding bar (43). One end of the sliding bar (43) abuts against the spring (42). The top of the sliding bar (43) is fixedly connected with a rack (44). The top of the guide sleeve (41) is provided with an opening slot (441) along the length direction. The rack (44) is slidably provided in the corresponding opening slot (441). Two racks (44) and two half gears (51) are engaged one by one. The screw sleeve (74) is connected with two push rods (75). The two push rods (75) are configured to push the two sliding bars (43) respectively to compress the corresponding springs (42).

4. A wind turbine blade inspection device according to claim 3, wherein, The half gear (51) is coaxially fixed with a rotating shaft (52). The two rotating shafts (52) are rotatably connected to the two sides of the fixed cover (4) respectively.

5. A wind turbine blade inspection device according to claim 3, wherein, The linear drive mechanism further includes a sliding seat (76). The sliding seat (76) is sleeved on the screw sleeve (74). The top of the frame (71) is provided with two long holes spaced apart along the width direction. The two push rods (75) respectively extend into the two long holes and are connected with the sliding seat (76).

6. A wind turbine blade inspection device according to claim 5, wherein, The inside of the frame (71) is provided with two guide rods (711). The guide rods (711) are arranged along the length direction of the frame (71). The sliding seat (76) is provided with two guide holes (761). The two guide rods (711) are respectively inserted into the two guide holes (761).

7. A wind turbine blade inspection device according to claim 6, wherein, Two said guide rods (711) are symmetrically arranged on both sides of the screw rod (72).

8. The wind turbine blade inspection device of claim 3, wherein, The inner side of the fixed cover shell (4) away from the push rod (75) is fixed with a baffle (45), and the baffle (45) is located on the movement path of the auxiliary cover shell (5).

9. The wind turbine blade inspection device of claim 3, wherein, The end of the sliding bar (43) away from the spring (42) is fixed with a rubber buffer pad.

10. The wind turbine blade inspection apparatus of claim 2, wherein, The frame (71) is provided with a position sensor at one end close to the fixed cover shell (4), and the position sensor is electrically connected to the control console.

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