Internal defect detection device for wind power generation blade

Abstract

The invention discloses a wind power generation blade internal defect detection device, and relates to the technical field of blade flaw detection. The device comprises a displacement assembly installed on a blade and a detection assembly arranged below the blade. The displacement assembly is composed of a carbon fiber cylindrical rod, a cross beam frame, a sliding block and a driving part, and the device can move on the surfaces of the blades in multiple directions through thrust generated by the blades and a servo motor. The detection assembly comprises an X-ray machine and an ultraviolet generation unit which are respectively used for detecting internal and surface defects of the blade. The X-ray machine and the fluorescence intensifying screen realize real-time imaging through remote synchronous movement; the ultraviolet unit realizes rectangular light beam scanning through a reflecting prism and a swinging mechanism; software combines the separation influence into a joint image through an AI automatic identification algorithm, and the joint image is convenient to file in position identification.

Description

Technical Field

[0001] This invention relates to the field of blade flaw detection technology, specifically to a device for detecting internal defects in wind turbine blades. Background Technology

[0002] Large wind turbine blades typically employ lightweight core materials as reinforcement, and the bonding quality directly impacts the blade's mechanical properties and service life. Currently, ultrasonic waves are widely used in the wind turbine blade industry for bonding quality inspection, but they exhibit significant limitations in the web (trailing edge) region: Poor dielectric penetration: The web typically uses a composite structure of fiberglass reinforced plastic (GFRP) and porous core materials, where ultrasonic waves are severely attenuated and cannot effectively penetrate. Significant signal interference: The non-uniformity of the core material complicates the ultrasonic echo signal, making it difficult to distinguish between actual defects and structural noise. Blind zone limitations: Existing ultrasonic technology exhibits significantly reduced resolution for bonding layers exceeding 40mm in thickness or structures containing core materials, making web bonding quality inspection a major industry challenge.

[0003] In addition, infrared thermal imaging is suitable for detecting the bonding between the skin and the web, but its sensitivity is insufficient for deep defects (such as debonding inside the core material). Phased array ultrasound, although low-frequency phased arrays can improve penetration, has limited near-surface resolution for thin adhesive layers (5-10mm) in the small web.

[0004] Traditional methods for inspecting the internal structure of wind turbine blades primarily involve manually setting up X-ray films, with personnel manually moving the films and X-ray machine at each inspection point for exposure. This method is cumbersome and labor-intensive, requiring repeated adjustments to the equipment position and personnel moving away from the site during exposure, resulting in extremely low inspection efficiency. For surface defects, manual visual inspection combined with ultraviolet light irradiation is typically used to observe fluorescence reactions. However, this method exposes operators to prolonged ultraviolet light exposure, potentially impacting their health. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides the following technical solution: a wind turbine blade internal defect detection device, comprising a displacement assembly that can be installed on the wind turbine blade and a detection assembly disposed below the wind turbine blade; wherein the displacement assembly comprises three parallel carbon fiber cylindrical rods and two crossbeam frames, one of which is fixedly connected to one end of all the carbon fiber cylindrical rods, and the other crossbeam frame is slidably sleeved on the three crossbeam frames; the displacement assembly further comprises three parallel sliding blocks, each sliding block slidingly engaging with the three crossbeam frames, and a spring steel plate fixedly installed between the three sliding blocks; a drive unit is rotatably mounted on the crossbeam frame located in the middle position for pushing the three sliding blocks to move along the axial direction of the carbon fiber cylindrical rods; wherein the detection assembly comprises an X-ray machine capable of emitting X-rays and an ultraviolet light generating unit.

[0006] Preferably, each crossbeam frame is rotatably mounted with two side rubber rollers and two side support rollers. The side support rollers support the crossbeam frame in the direction of gravity, while the side rubber rollers limit the displacement of the crossbeam frame in the width direction of the wind turbine blade. Three screws are also threaded onto the crossbeam frame that slides with the carbon fiber cylindrical rods. Each screw abuts against the carbon fiber cylindrical rod to adjust the sliding damping force between the crossbeam frame and the three carbon fiber cylindrical rods. A helical spring is also wrapped around each carbon fiber cylindrical rod. One end of the helical spring is fixedly connected to the crossbeam frame that slides with the carbon fiber cylindrical rod, and the other end of the helical spring is fixedly engaged with the carbon fiber cylindrical rod.

[0007] Preferably, a caster wheel is rotatably mounted at the center of the lower surface of each sliding block to support the sliding block, and the caster wheel rolls in contact with the surface of the wind turbine blade.

[0008] Preferably, the drive unit includes a swing base fixedly connected to a sliding block located in the middle position, a swing frame rotatably mounted on the swing base, a servo motor located at the axial center of the swing base on the swing frame, the housing of the servo motor fixedly connected to the swing frame, the output shaft of the servo motor fixedly connected to the swing base, and the servo motor used to drive the swing frame to rotate on the swing base; a fairing is fixedly mounted on the swing frame, a push motor bracket is fixedly mounted on the fairing, a push motor is coaxially fixedly mounted on the fairing through the push motor bracket, a blade is fixedly mounted on the output shaft of the push motor, the blade is located at the axial center inside the fairing, and a converging ring is fixedly fixed at the end of the fairing by magnetic attraction for easy disassembly.

[0009] Preferably, the X-ray machine and the ultraviolet generating unit are fixedly mounted on the vehicle panel, and four motor wheel sets are rotatably mounted on the lower surface of the vehicle panel; a fluorescence intensifying screen mounting frame is fixedly mounted on one of the sliding blocks, a light shield is fixedly mounted on the fluorescence intensifying screen mounting frame, a second camera is fixedly mounted on the top of the inner wall of the light shield, and a fluorescence intensifying screen is also fixedly mounted on the inner side of the fluorescence intensifying screen mounting frame.

[0010] Preferably, the ultraviolet generating unit includes a base fixedly connected to the vehicle panel, a dark shell fixedly fastened to the base, a light-transmitting opening on the dark shell, and a rotatable square prism, double-sided panel, and hexagonal prism arranged below the light-transmitting opening on the dark shell. The square prism, double-sided panel, and hexagonal prism are coaxially and rotatably mounted on a mirror bracket, and a drive motor for driving the square prism, double-sided panel, and double-sided panel to rotate is also fixedly mounted on the mirror bracket; a first camera is also fixedly mounted on the dark shell; each face of the square prism, double-sided panel, and hexagonal prism is a reflective mirror.

[0011] Preferably, the mirror bracket is linearly slidably mounted on the swing plate, and an electric cylinder is also fixedly mounted on the swing plate. The telescopic cylinder of the electric cylinder is fixedly engaged with the swing plate, and the end of the telescopic rod of the electric cylinder is fixedly engaged with the mirror bracket. A counterweight is also fixedly mounted on the swing plate to balance the weight of the load on both sides of the swing plate.

[0012] Preferably, the swing plate is fixedly mounted on the triangle plate, the triangle plate is swing-mounted on the triangle plate bracket, the triangle plate bracket is fixedly mounted on the swing seat, and an elastic belt is elastically connected between the swing seat and the two ends of the triangle plate; wherein the swing seat is fixedly mounted on the swing translation plate.

[0013] Preferably, the swing translation plate is slidably mounted on the base along the width direction of the base. Four spring ring brackets are also symmetrically fixed on the base, and each spring ring bracket is elastically connected to the edge of the swing translation plate through a spring ring. An electromagnet is also fixedly mounted on the base, and an iron block that cooperates with the magnetic force of the electromagnet is fixedly mounted on the swing translation plate to push the swing translation plate to slide on the base.

[0014] Preferably, a light-shielding shell is also fixedly installed on the swinging translation plate. An ultraviolet lamp, a collimating lens, a convex lens, and a concave lens are sequentially fixedly installed on the inner wall of the light-shielding shell. The ultraviolet lamp is located on the innermost side of the light-shielding shell, and the concave lens is located at the outermost outlet of the light-shielding shell. An outlet is provided at one end of the light-shielding shell facing the square prism, double-sided panel, or hexagonal prism, and the concave lens is installed in this outlet to emit ultraviolet light.

[0015] Compared with the prior art, the present invention has the following advantages: (1) The present invention achieves synchronous movement of the X-ray machine and the fluorescence intensifying screen by cooperating with the displacement component and the remote control trolley, without the need for personnel to approach the blade for operation, and all flaw detection processes can be remotely controlled. This not only significantly reduces the risk of radiation to the operator, but also automates and makes the whole detection process continuous through the coordinated control of the motor and servo system, improving the detection speed and efficiency, and is particularly suitable for online rapid detection of large wind turbine blades; (2) The ultraviolet generation unit of the present invention forms an adjustable rectangular scanning optical path through prisms, reflective mirrors and electromagnetic drive components. By adjusting the reflection frequency and angle of different geometric surfaces, the controllable swing and rectangular coverage of the ultraviolet beam are achieved, thereby forming a rectangular ultraviolet irradiation surface on the blade surface. Compared with traditional point source irradiation, this structure can expand the irradiation area and improve the illumination uniformity without increasing the power, and greatly improve the contrast of surface fluorescence response and the accuracy of defect identification; (3) The present invention integrates two optical detection methods, X-ray imaging and ultraviolet fluorescence detection, and can simultaneously complete the comprehensive scanning of internal structural defects and surface cracks of the blade in the same detection task. Attached Figure Description

[0016] Figure 1This is a diagram showing the installation location of the present invention.

[0017] Figure 2 This is a structural diagram of the displacement component of the present invention.

[0018] Figure 3 This is a structural diagram of the drive unit of the present invention.

[0019] Figure 4 This is a structural diagram of the ultraviolet generation unit of the present invention.

[0020] Figure 5 For the present invention Figure 4 Schematic diagram at point A in the middle.

[0021] Figure 6 This is a diagram showing the installation position of the spring coil in this invention.

[0022] Figure 7 This is a structural diagram of the mirror support of the present invention.

[0023] Figure 8 This is a structural diagram of the internal structure of the light-shielding shell of the present invention.

[0024] In the diagram: 101-Car platform; 102-X-ray machine; 103-Motor wheel assembly; 104-Dark shell; 105-Light-piercing port; 106-Base; 107-Swinging translation plate; 108-Electromagnet; 109-Iron block; 110-Spring coil bracket; 111-Spring coil; 112-Light-shielding shell; 113-Ultraviolet lamp; 114-Collimating lens; 115-Convex lens; 116-Concave lens; 117-Swinging cross plate; 118-Electric cylinder; 119-Counterweight; 120-Drive motor; 121-Mirror bracket; 122-Square prism; 123-Double-sided plate; 124-Hexagonal prism; 125-Swinging base; 126-Triangle plate; 1 27-Elastic belt; 128-Triangular plate bracket; 201-Carbon fiber cylindrical rod; 202-Crossbeam frame; 203-Side rubber roller; 204-Side support roller; 205-Screw; 206-Helical spring; 207-Sliding block; 208-Spring steel plate; 209-Swing base; 210-Swing frame; 211-Servo motor; 212-Fairing; 213-Push motor bracket; 214-Push motor; 215-Paddle blade; 216-Fluorescence focusing ring; 217-Fluorescent intensifier screen; 218-Universal wheel; 219-Fluorescent intensifier screen mounting frame; 220-Sunshade; 301-First camera; 302-Second camera. Detailed Implementation

[0025] The following is in conjunction with the appendix Figures 1-8 The technical solution of the present invention will be further illustrated through specific embodiments.

[0026] This invention provides a device for detecting internal defects in wind turbine blades, comprising a displacement assembly that can be installed on the wind turbine blade and a detection assembly disposed below the wind turbine blade; wherein the displacement assembly includes three parallel carbon fiber cylindrical rods 201 and two crossbeam frames 202, one of the crossbeam frames 202 being fixedly connected to one end of all the carbon fiber cylindrical rods 201, and the other crossbeam frame 202 being slidably sleeved on the three crossbeam frames 202; the displacement assembly also includes three parallel sliding blocks 207, each sliding block 207 being slidably engaged with the three crossbeam frames 202, and a spring steel plate 208 being fixedly installed between the three sliding blocks 207; a drive unit is rotatably mounted on the crossbeam frame 202 located in the middle position for pushing the three sliding blocks 207 to move along the axial direction of the carbon fiber cylindrical rods 201; wherein the detection assembly includes an X-ray machine 102 capable of emitting X-rays and an ultraviolet light generating unit. Each crossbeam frame 202 is rotatably mounted with two side rubber rollers 203 and two side support rollers 204. The side support rollers 204 are used to support the crossbeam frame 202 in the direction of gravity, while the side rubber rollers 203 are used to limit the displacement of the crossbeam frame 202 in the width direction of the wind turbine blade. The crossbeam frame 202, which slides with the carbon fiber cylindrical rod 201, is also threaded with three screws 205. Each screw 205 can abut against the carbon fiber cylindrical rod 201 to adjust the sliding damping force between the crossbeam frame 202 and the three carbon fiber cylindrical rods 201. Each carbon fiber cylindrical rod 201 is also wrapped with a helical spring 206. One end of the helical spring 206 is fixedly connected to the crossbeam frame 202 that slides with the carbon fiber cylindrical rod 201, and the other end of the helical spring 206 is fixedly engaged with the carbon fiber cylindrical rod 201. Each sliding block 207 has a rotatable caster 218 rotatably mounted at the center of its lower surface to support the sliding block 207. The caster 218 rolls in contact with the surface of the wind turbine blade.

[0027] The drive unit includes a swing base 209 fixedly connected to a sliding block 207 located in the middle position. A swing frame 210 is rotatably mounted on the swing base 209. A servo motor 211 is located at the axial center of the swing frame 210. The housing of the servo motor 211 is fixedly connected to the swing frame 210. The output shaft of the servo motor 211 is fixedly connected to the swing base 209. The servo motor 211 is used to drive the swing frame 210 to rotate on the swing base 209. A fairing 212 is fixedly mounted on the swing frame 210. A push motor bracket 213 is fixedly mounted on the fairing 212. A push motor 214 is coaxially fixedly mounted on the fairing 212 through the push motor bracket 213. A blade 215 is fixedly mounted on the output shaft of the push motor 214. The blade 215 is located at the axial center inside the fairing 212. A converging ring 216 is magnetically attached to the end of the fairing 212 for easy disassembly.

[0028] The X-ray machine 102 and the ultraviolet generating unit are fixedly mounted on the vehicle platform 101. Four motor wheel sets 103 are rotatably mounted on the lower surface of the vehicle platform 101. A fluorescence intensifying screen mounting frame 219 is fixedly mounted on one of the sliding blocks 207. A light shield 220 is fixedly mounted on the fluorescence intensifying screen mounting frame 219. A second camera 302 is fixedly mounted on the top of the inner wall of the light shield 220. A fluorescence intensifying screen 217 is also fixedly mounted on the inner side of the fluorescence intensifying screen mounting frame 219.

[0029] The ultraviolet generating unit includes a base 106 fixedly connected to the vehicle panel 101. A dark shell 104 is fixedly fastened to the base 106. A light-transmitting port 105 is opened on the dark shell 104. A rotatable square prism 122, a double-sided panel 123, and a hexagonal prism 124 are arranged below the light-transmitting port 105 on the dark shell 104. The square prism 122, the double-sided panel 123, and the hexagonal prism 124 are coaxially rotatably mounted on a mirror bracket 121. A drive motor 120 for driving the square prism 122, the double-sided panel 123, and the hexagonal prism 124 to rotate is also fixedly mounted on the mirror bracket 121. A first camera 301 is also fixedly mounted on the dark shell 104. Each face of the square prism 122, the double-sided panel 123, and the hexagonal prism 124 is a reflective mirror. A mirror support 121 is linearly slidably mounted on a swing plate 117. An electric cylinder 118 is also fixedly mounted on the swing plate 117. The telescopic cylinder of the electric cylinder 118 is fixedly engaged with the swing plate 117, and the end of the telescopic rod of the electric cylinder 118 is fixedly engaged with the mirror support 121. A counterweight 119 is also fixedly mounted on the swing plate 117 to balance the weight of the load on both sides of the swing plate 117. The swing plate 117 is fixedly mounted on a triangular plate 126. The triangular plate 126 is sway-mounted on a triangular plate support 128. The triangular plate support 128 is fixedly mounted on a swing base 125. An elastic belt 127 is elastically connected between the two ends of the swing base 125 and the triangular plate 126. The swing base 125 is fixedly mounted on a swing translation plate 107. The swinging translation plate 107 is linearly slidably mounted on the base 106 along its width. Four spring coil supports 110 are symmetrically fixedly mounted on the base 106, each spring coil support 110 being elastically connected to the edge of the swinging translation plate 107 via a spring coil 111. An electromagnet 108 is also fixedly mounted on the base 106, and an iron block 109, magnetically engaged with the electromagnet 108, is fixedly mounted on the swinging translation plate 107 to push the swinging translation plate 107 to slide on the base 106. A light-shielding shell 112 is also fixedly mounted on the swinging translation plate 107. An ultraviolet lamp 113, a collimating lens 114, a convex lens 115, and a concave lens 116 are sequentially fixedly mounted on the inner wall of the light-shielding shell 112. The ultraviolet lamp 113 is located on the innermost side of the light-shielding shell 112, and the concave lens 116 is located at the outermost outlet of the light-shielding shell 112. The light-shielding shell 112 has an outlet at one end facing the square prism 122, the double-sided panel 123, and the hexagonal prism 124. A concave lens 116 is installed in the outlet to emit ultraviolet rays.

[0030] Currently, traditional X-ray flaw detection involves manually placing film at each location on the blade. Each inspection requires adjusting the positions of the film and the X-ray machine 102, and personnel must be away from the site each time the X-ray machine 102 is started, making it very inefficient. Therefore, a displacement component is used to achieve remote control of the entire operation process.

[0031] The vehicle platform 101 and four motor wheel sets 103 form a remote-controlled vehicle used to move the X-ray machine 102 and the ultraviolet generating unit on the ground. During the inspection, the wind turbine blades are mounted on the support, and the remote-controlled vehicle moves under the blades carrying the X-ray machine 102 and the ultraviolet generating unit. During testing, the displacement assembly needs to be installed on the upper surface of the blade. Specifically, three carbon fiber cylindrical rods 201 are placed on the blade, and then the side rubber roller 203 and side support roller 204 on one side are brought into contact with one side of the blade. Then, the crossbeam frame 202 is pushed so that the side rubber roller 203 and side support roller 204 on the other side are brought into contact with the edge of the blade by the elastic force of the coil spring 206. This achieves clamping of the blade by the side rubber rollers 203 on both sides (it should be noted that this is not clamping, but is only set up to prevent the displacement assembly from falling off the blade). The side support roller 204 and the caster wheel 218 provide vertical support. The crossbeam frame 202, which slides with the carbon fiber cylindrical rod 201, has a through hole diameter that is larger than the diameter of the carbon fiber cylindrical rod 201. This is designed to allow the crossbeam frame 202 to swing slightly on the carbon fiber cylindrical rod 201.

[0032] When the control displacement assembly moves along the length of the blade, the axis of the blade 215 is made parallel to the length of the blade. Then, the drive motor 214 is activated, and the output shaft of the drive motor 214 drives the blade 215 to rotate. The blade 215 generates thrust, thereby moving the entire displacement assembly along the blade. When the control displacement assembly moves in the opposite direction along the width of the blade, the axis of the blade 215 is made perpendicular to the length of the blade. Then, the drive motor 214 is activated, and the output shaft of the drive motor 214 drives the blade 215 to rotate. The blade 215 generates thrust, thereby moving the entire displacement assembly along the width of the blade (specifically, the components mounted on the sliding block 207 are displaced along the axial direction of the carbon fiber cylindrical rod 201). The rotation of the blade 215 is controlled by the servo motor 211. Controlling the rotation angle of the servo motor 211's output shaft controls the swing direction of the swing frame 210, thereby controlling the swing angle and direction of the blade 215. Since the housing of the servo motor 211 is fixed to the swing frame 210, and the output shaft of the servo motor 211 is fixed to the swing base 209, when the output shaft of the servo motor 211 rotates, it is actually the housing of the servo motor 211 that rotates, thus controlling the swing frame 210 to rotate on the swing base 209. The purpose of the displacement component is to align with the X-ray machine 102. When the X-ray machine 102 is working, it emits X-rays. After passing through the blade, the X-rays are projected onto the fluorescent intensifying screen 217 to capture images, thereby detecting defects inside the blade. Observation is performed by the second camera 302 located inside the light shield 220. Therefore, by using a remote-controlled trolley to move the X-ray machine 102 to different positions, a comprehensive inspection of the blade can be achieved. Simultaneously, the displacement component moves the fluorescent intensifying screen 217 synchronously with the remote-controlled trolley to capture the effects of X-rays.

[0033] If further detection of defects on the blade surface is required, an ultraviolet fluorescent agent needs to be sprayed onto the blade surface. Then, the ultraviolet lamp 113 is activated, emitting ultraviolet light. This ultraviolet light first passes through the collimating lens 114, which collimates the ultraviolet light before it shines onto the convex lens 115. The convex lens 115 then focuses the ultraviolet light onto the concave lens 116 (not directly into the concave lens 116, but outside it). The concave lens 116 collimates the ultraviolet light refracted by the convex lens 115, forming a dense beam of ultraviolet light. (This is because if an ultraviolet scattering light source were used, its intensity would be low, making detection difficult. Using a large-area, bright light source would generate a lot of heat during operation, and its size and cost would be prohibitively high. Therefore, this micromechanical sensor method is used to expand the ultraviolet light range while ensuring sufficient light intensity.) The ultraviolet light beam irradiates the square prism 122, double-sided panel 123, and hexagonal prism 124, reflecting the light. Specifically, the telescopic rod of the electric cylinder 118 drives the mirror support 121 to slide on the swing plate 117, aligning the square prism 122, double-sided panel 123, and hexagonal prism 124 with the beam. Then, the drive motor 120 is activated, and its output shaft rotates the square prism 122, double-sided panel 123, and hexagonal prism 124. Because the number of sides of the square prism 122, double-sided panel 123, and hexagonal prism 124 is different, each face will have a different swing angle at the same rotation angle (the more faces, the smaller the swing angle and the higher the frequency). This allows for adjustment of the swing range of the reflected ultraviolet beam. By intermittently activating the electromagnet 108, the electromagnet 108 generates magnetic force, attracting the iron block 109, which then moves closer to the electromagnet 108. Simultaneously, this causes the swinging translation plate 107 to move synchronously. When the electromagnet 108 is de-energized, the swinging translation plate 107 returns to its original position under the action of the spring coil 111, thus driving the swinging translation plate 107 to reciprocate linearly on the base 106. Simultaneously, the swing seat 125 on the base 106 also moves synchronously. At this time, the swinging horizontal plate 117 mounted on the triangular plate bracket 128 swings on the triangular plate bracket 128 due to the movement of the swinging translation plate 107. During this time, the two elastic belts 127 continuously stretch and contract.The swinging of the swinging horizontal plate 117 causes the square prism 122, double-sided plate 123, and hexagonal prism 124 on the swinging horizontal plate 117 to swing. At this time, the square prism 122, double-sided plate 123, and hexagonal prism 124 reflect ultraviolet light and swing in another direction, and the two swinging directions are perpendicular (the axis of the drive motor 120 intersects and is perpendicular to the swinging axis of the triangle plate 126 on the triangle plate bracket 128). This achieves rectangular scanning, which projects a rectangular light spot on the lower surface of the blade to illuminate the phosphor. If there are defects on the blade surface, due to capillary action, more phosphor will accumulate at the defect, thus making the brightness greater. The observation and recording are carried out by the first camera 301 set on the dark shell 104.

Claims

1. A device for detecting internal defects in wind turbine blades, characterized in that: This includes displacement components that can be installed on wind turbine blades and detection components that are positioned below the wind turbine blades; The displacement component includes three parallel carbon fiber cylindrical rods (201) and two crossbeam frames (202), one of which is fixedly connected to one end of all the carbon fiber cylindrical rods (201), and the other is slidably sleeved on the three crossbeam frames (202). The displacement assembly also includes three parallel sliding blocks (207), each sliding block (207) slidingly engaging with three crossbeam frames (202), and a spring steel plate (208) fixedly installed between the three sliding blocks (207); a drive unit is rotatably mounted on the crossbeam frame (202) located in the middle position for pushing the three sliding blocks (207) to move along the axial direction of the carbon fiber cylindrical rod (201); The detection components include an X-ray machine (102) capable of emitting X-rays and an ultraviolet generation unit.

2. The wind turbine blade internal defect detection device according to claim 1, characterized in that: Each crossbeam frame (202) is rotatably mounted with two side rubber rollers (203) and two side support rollers (204), wherein the side support rollers (204) are used to support the crossbeam frame (202) in the direction of gravity, and the side rubber rollers (203) are used to limit the displacement of the crossbeam frame (202) in the direction of the width of the wind turbine blade; Three screws (205) are threaded on the crossbeam frame (202) that slides with the carbon fiber cylindrical rod (201). Each screw (205) can abut against the carbon fiber cylindrical rod (201) to adjust the sliding damping force between the crossbeam frame (202) and the three carbon fiber cylindrical rods (201). Each carbon fiber cylindrical rod (201) is also surrounded by a helical spring (206), one end of which is fixedly connected to the crossbeam frame (202) that slides with the carbon fiber cylindrical rod (201), and the other end of which is fixedly connected to the carbon fiber cylindrical rod (201).

3. The wind turbine blade internal defect detection device according to claim 2, characterized in that: Each sliding block (207) has a rotatable caster (218) mounted at the center of its lower surface to support the sliding block (207). The caster (218) rolls in contact with the surface of the wind turbine blade.

4. The wind turbine blade internal defect detection device according to claim 3, characterized in that: The drive unit includes a swing base (209) fixedly connected to a sliding block (207) located in the middle position. A swing frame (210) is rotatably mounted on the swing base (209). A servo motor (211) is provided on the swing frame (210) at the axial position of the swing base (209). The housing of the servo motor (211) is fixedly connected to the swing frame (210). The output shaft of the servo motor (211) is fixedly connected to the swing base (209). The servo motor (211) is used to drive the swing frame (210) to rotate on the swing base (209). A fairing (212) is fixedly installed on the swing frame (210). A push motor bracket (213) is fixedly installed on the fairing (212). A push motor (214) is coaxially fixedly installed on the fairing (212) through the push motor bracket (213). A blade (215) is fixedly installed on the output shaft of the push motor (214). The blade (215) is located at the axial position inside the fairing (212). A flow-collecting ring (216) is fixedly fixed at the end of the fairing (212) in a magnetic way for easy disassembly.

5. The wind turbine blade internal defect detection device according to claim 4, characterized in that: The X-ray machine (102) and the ultraviolet generation unit are fixedly mounted on the vehicle plate (101), and four motor wheel sets (103) are rotatably mounted on the lower surface of the vehicle plate (101). A fluorescent intensifying screen mounting frame (219) is fixedly installed on one of the sliding blocks (207), a light shield (220) is fixedly installed on the fluorescent intensifying screen mounting frame (219), a second camera (302) is fixedly installed on the top of the inner wall of the light shield (220), and a fluorescent intensifying screen (217) is also fixedly installed on the inner side of the fluorescent intensifying screen mounting frame (219).

6. The wind turbine blade internal defect detection device according to claim 5, characterized in that: The ultraviolet generating unit includes a base (106) fixedly connected to the vehicle panel (101). A dark shell (104) is fixedly fastened on the base (106). A light-transmitting port (105) is opened on the dark shell (104). A rotatable square prism (122), double-sided panel (123), and hexagonal prism (124) are arranged below the light-transmitting port (105) on the dark shell (104). The square prism (122), double-sided panel (123), and hexagonal prism (124) are coaxially rotatably mounted on a mirror bracket (121). A drive motor (120) for driving the square prism (122), double-sided panel (123), and double-sided panel (124) to rotate is also fixedly mounted on the mirror bracket (121). A first camera (301) is also fixedly mounted on the dark shell (104). Each face of the square prism (122), double-sided panel (123), and hexagonal prism (124) is a reflective mirror.

7. The wind turbine blade internal defect detection device according to claim 6, characterized in that: The mirror bracket (121) is linearly slidably mounted on the swing plate (117). An electric cylinder (118) is also fixedly mounted on the swing plate (117). The telescopic cylinder of the electric cylinder (118) is fixedly engaged with the swing plate (117), and the end of the telescopic rod of the electric cylinder (118) is fixedly engaged with the mirror bracket (121). A counterweight (119) is also fixedly mounted on the swing plate (117). The counterweight (119) is used to balance the weight of the load on both sides of the swing plate (117).

8. The wind turbine blade internal defect detection device according to claim 7, characterized in that: The swing plate (117) is fixedly installed on the triangle plate (126), the triangle plate (126) is swing-mounted on the triangle plate bracket (128), the triangle plate bracket (128) is fixedly installed on the swing seat (125), and an elastic belt (127) is elastically connected between the two ends of the swing seat (125) and the triangle plate (126); wherein the swing seat (125) is fixedly installed on the swing translation plate (107).

9. The wind turbine blade internal defect detection device according to claim 8, characterized in that: The swing translation plate (107) is slidably mounted on the base (106) along the width direction of the base (106). Four spring ring brackets (110) are also symmetrically fixed on the base (106). Each spring ring bracket (110) is elastically connected to the edge of the swing translation plate (107) through a spring ring (111). An electromagnet (108) is also fixedly mounted on the base (106). An iron block (109) that cooperates with the magnetic force of the electromagnet (108) is fixedly mounted on the swing translation plate (107) to push the swing translation plate (107) to slide on the base (106).

10. The wind turbine blade internal defect detection device according to claim 9, characterized in that: A light-shielding shell (112) is also fixedly installed on the swing translation plate (107). An ultraviolet lamp (113), a collimating lens (114), a convex lens (115), and a concave lens (116) are fixedly installed on the inner wall of the light-shielding shell (112) in sequence. The ultraviolet lamp (113) is located on the innermost side of the light-shielding shell (112), and the concave lens (116) is located on the outermost outlet of the light-shielding shell (112).

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