A non-destructive flaw detection device for wind turbine blades in drones

Abstract

The present invention discloses a non-destructive flaw detection device for the internal part of a wind turbine blade using an unmanned aerial vehicle, comprising an unmanned aerial vehicle, a fixing groove being provided on the bottom wall of the unmanned aerial vehicle, two pushers being fixedly connected to the upper inner wall of the fixing groove, the output end of each pusher being fixedly connected to a push rod, the other end of each push rod being fixedly connected to a connecting block, wherein the bottom end of one of the connecting blocks is fixedly connected to a mounting plate 1, the bottom end of the mounting plate 1 is fixedly connected to a fixing plate 1, a mounting groove being provided on the bottom wall of the mounting plate 1, and a signal receiving plate being further provided below the fixing plate 1. The present invention detects blades using an unmanned aerial vehicle, and the unmanned aerial vehicle moves along the blades to detect different positions of the blades. The device does not need to contact the blades and will not damage the blades, thereby improving the shortcomings of existing surface photography for defect recognition, reducing the cost of flaw detection, and being more efficient.

Description

Technical Field

[0001] The invention relates to the field of wind turbine blade flaw detection, and in particular to a non-destructive flaw detection device for the inside of a wind turbine blade unmanned aerial vehicle. Background Art

[0002] Wind turbine blades are generally made of glass fiber composite materials. Due to the complexity of the manufacturing process, defects are inevitable during the molding process. In addition, due to the harsh working environment and the complexity and variability of working conditions, they will also suffer varying degrees of damage during operation. Over time, the blades may even become unstable and break, causing major safety accidents and economic losses.

[0003] At present, the main non-destructive testing methods for wind turbine blades include X-ray, ultrasonic, acoustic emission, fiber optic sensor, infrared thermal imaging detection technology, etc. However, each detection method has its own advantages and limitations.

[0004] At present, the most widely used online inspection system for wind turbines is the acoustic emission detection system. The acoustic emission detection method is a non-destructive testing method that evaluates material performance or structural integrity by receiving and analyzing the acoustic emission signals of the material. The acoustic emission detection technology can dynamically monitor the initiation and expansion of cracks, and can effectively detect the integrity of the wind turbine blade structure and evaluate the actual degree of damage of the defects. However, in actual applications, since acoustic emission is very sensitive to environmental factors, it will interfere with the monitoring system and affect the accuracy of detection, so it is difficult to quantitatively analyze defects. Moreover, each wind turbine requires professional operation and inspection personnel to carry equipment into the wind turbine for data collection and analysis, so this solution is not feasible.

[0005] Currently, the existing drone intelligent wind turbine inspections on the market can be used for inspections of the outside of wind turbine blades, but many blade structural damages start from the inside. Drone automatic flight inspections solve the existing appearance inspections, but cannot thoroughly inspect the internal cracks and lightning damage of the blades. When the drone can be observed from the outside, the blades have already had serious problems. Due to the high cost, low efficiency and long downtime of manual flaw detection, there is an urgent need for a drone solution to internal blade problems that can quickly and efficiently inspect the inside of the blades to minimize losses. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings existing in the prior art, such as: the existing drone intelligent wind turbine inspection can be used for the inspection of the outside of the wind turbine blades, the manual flaw detection has high cost, low efficiency and long downtime, so there is an urgent need for a drone solution to the internal problems of the blades, which can quickly and efficiently inspect the inside of the blades and minimize the losses, and a drone internal non-destructive flaw detection device for wind turbine blades is proposed.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A non-destructive flaw detection device for the internal part of a wind turbine blade unmanned aerial vehicle comprises an unmanned aerial vehicle, wherein a fixing groove is provided on the bottom wall of the unmanned aerial vehicle, two pushers are fixedly connected to the upper inner wall of the fixing groove, the output end of each pusher is fixedly connected to a pushing rod, the other end of each pushing rod is fixedly connected to a connecting block, wherein the bottom end of one of the connecting blocks is fixedly connected to a mounting plate 1, the bottom end of the mounting plate 1 is fixedly connected to a fixing plate 1, a mounting groove is provided on the bottom wall of the mounting plate 1, and a signal connector is also provided below the fixing plate 1 The top of the signal receiving plate extends into the internal setting of the mounting groove, and a plurality of fixing bolts are arranged at the left and right ends of the fixing plate one, and each of the fixing bolts penetrates the side wall of the corresponding mounting groove and extends into the internal setting of the mounting groove, and the other end of each of the fixing bolts is rotatably connected to a pressing block, and the other ends of the plurality of pressing blocks are tightly arranged against the side wall of the corresponding signal receiving plate, and a threaded groove corresponding to the fixing bolt is arranged at the position where each of the fixing bolts is connected to the fixing plate one, and a signal generating device is slidably connected to the bottom end of another of the connecting blocks.

[0009] Preferably, the signal generating device includes an X-ray emitting device, a mounting plate 2 is slidably connected to the bottom end of the other connecting block, a slider 1 is also fixedly connected to the bottom wall of the connecting block, a slide groove 1 corresponding to the mounting plate 2 is opened at the top of the mounting plate 2, two connecting plates are fixedly connected to the bottom wall of the mounting plate 2, a carrying plate is fixedly connected to the other end of the two connecting plates, the X-ray emitting device is arranged at the top of the carrying plate, and the carrying plate is arranged toward the signal receiving plate, a through groove corresponding to it is opened on the connecting plate between the carrying plate and the signal receiving plate, a pressing plate is slidably connected between the two connecting plates, a slider 2 is fixedly connected to the left and right ends of the pressing plate, and a slide groove 2 matching the two sliders 2 is also opened on the side walls of the two connecting plates close to each other, a vertically arranged buffer spring is fixedly connected to the top of the pressing plate, the other end of the buffer spring is fixedly connected to the bottom wall of the fixing plate 2, and the bottom wall of the pressing plate is arranged in contact with the top of the X-ray emitting device.

[0010] Preferably, a permanent magnet is fixedly connected to the side wall of the mounting plate one close to the mounting plate two, and an electromagnet corresponding to the permanent magnet is also fixedly connected to the side wall of the mounting plate two close to the mounting plate one. Two cameras are arranged on the drone, and both cameras are associated with the control end of the drone, and the control end is associated with the electromagnet. The two cameras are symmetrically arranged about the center line of the drone, and the two cameras are arranged obliquely downward.

[0011] Preferably, a layer of buffer pad is fixedly provided on the bottom wall of the pressing plate, and the buffer pad is made of sponge.

[0012] Preferably, the length of the signal receiving plate corresponds to that of the signal generating device, and the length of the signal generating device is shorter than the length of the supporting frame of the drone.

[0013] Preferably, the signal receiving board is provided with an image analysis device matched therewith.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the blades are inspected by a drone, and the drone moves along the blades to inspect different positions of the blades. The device does not need to contact the blades and will not damage the blades. It improves the shortcomings of existing surface photography defect identification, reduces the cost of flaw detection, and is more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a non-destructive flaw detection device for wind turbine blades inside a drone proposed by the present invention;

[0016] Figure 2 A schematic diagram of the appearance of a UAV of a wind turbine blade internal non-destructive flaw detection device proposed by the present invention;

[0017] Figure 3 for Figure 1 The enlarged view of point A in the middle;

[0018] Figure 4 This is a schematic diagram of the three-dimensional structure of a signal receiving board of a non-destructive flaw detection device inside a wind turbine blade UAV proposed by the present invention.

[0019] In the figure: 1 drone, 2 fixing slot, 3 pusher, 4 push rod, 5 connecting block, 6 mounting plate 1, 7 fixing plate 1, 8 mounting slot, 9 signal receiving plate, 10 pressing block, 11 fixing bolt, 12 permanent magnet, 13 camera, 14 mounting plate 2, 15 slide slot 1, 16 slider 1, 17 fixing plate 2, 18 connecting plate, 19 pressing plate, 20 slider 2, 21 slide slot 2, 22 bearing plate, 23 X-ray emitting device, 24 buffer spring, 25 electromagnet. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] Reference Figure 1-4A non-destructive flaw detection device for the internal part of a wind turbine blade UAV includes a UAV 1, a fixing groove 2 is provided on the bottom wall of the UAV 1, and two pushers 3 are fixedly connected to the upper inner wall of the fixing groove 2. The two pushers 3 are exactly the same. Under the control of the control end, the two pushers 3 are synchronously driven, and the output end of each pusher 3 is fixedly connected to a push rod 4, and the other end of each push rod 4 is fixedly connected to a connecting block 5, wherein the bottom end of one connecting block 5 is fixedly connected to a mounting plate 6, and the bottom end of the mounting plate 6 is fixedly connected to a fixing plate 7, and a mounting groove 8 is provided on the bottom wall of the mounting plate 6, and a signal receiving board 9 is also provided below the fixing plate 7, and the top end of the signal receiving board 9 extends into the inner part of the mounting groove 8. A plurality of fixing bolts 11 are arranged at both ends of the left and right sides of the fixing plate 7, and each fixing bolt 11 penetrates through the side wall of the corresponding mounting groove 8 and extends into the interior of the mounting groove 8. The other end of each fixing bolt 11 is rotatably connected with a pressing block 10, and the other ends of the plurality of pressing blocks 10 are tightly arranged with the side wall of the corresponding signal receiving plate 9. The signal receiving plate 9 is provided with an image analysis device matched therewith, and a threaded groove corresponding to the fixing bolt 11 is arranged at the position where each fixing bolt 11 is connected to the fixing plate 7, and a signal generating device is slidably connected to the bottom end of another connecting block 5, and the signal generating device includes an X-ray emitting device 23, and the X-ray emitting device 23 emits X-rays, which are received by the signal receiving plate 9 after penetrating the blades, and the signal receiving plate 9 The received signal is transmitted to the image analysis device matched with it, and the image analysis device analyzes and images the signal. The bottom end of the other connecting block 5 is slidably connected to a mounting plate 2 14, and a slider 16 is fixedly connected to the bottom wall of the connecting block 5. The top of the mounting plate 2 14 is provided with a slide groove 15 corresponding to the mounting plate 2 14. Two connecting plates 18 are fixedly connected to the bottom wall of the mounting plate 2 14, and the other ends of the two connecting plates 18 are fixedly connected to a carrier plate 22. The X-ray emitting device 23 is arranged at the top of the carrier plate 22, and the carrier plate 22 is arranged toward the signal receiving plate 9. The connecting plate 18 located between the carrier plate 22 and the signal receiving plate 9 is provided with a through groove corresponding to it, and the two connecting plates 18 are slidably connected. A pressing plate 19 is connected, and a slider 20 is fixedly connected to both ends of the pressing plate 19. A slide groove 21 matching the two sliders 20 is also provided on the side walls of the two connecting plates 18 close to each other. A vertically arranged buffer spring 24 is fixedly connected to the top of the pressing plate 19, and the other end of the buffer spring 24 is fixedly connected to the bottom wall of the fixing plate 17. When the UAV 1 is flying, the rotation of the spiral blade will generate vibration, and the buffer spring 24 can buffer the vibration, thereby reducing the impact of the device on the X-ray emitting device 23. At the same time, the connecting plate 18 is pressed on the X-ray emitting device 23 under the action of the buffer spring 24 to prevent the X-ray emitting device 23 from being deflected due to the vibration, resulting in the emitted X-rays being unable to be received by the signal receiving plate 9.The bottom wall of the pressing plate 19 is set close to the top of the X-ray emitting device 23. A permanent magnet 12 is fixedly connected to the side wall of the mounting plate 16 near the mounting plate 2 14. An electromagnet 25 corresponding to the permanent magnet 12 is also fixedly connected to the side wall of the mounting plate 2 14 near the mounting plate 16. Two cameras 13 are arranged on the drone 1. Both cameras 13 are associated with the control end of the drone 1. The control end is associated with the electromagnet 25. The two cameras 13 are symmetrically arranged about the center line of the drone 1, and the two cameras 13 are arranged obliquely downward. A layer of buffer pad is fixedly arranged on the bottom wall of the pressing plate 19. The buffer pad is made of sponge. The length of the signal receiving plate 9 corresponds to the signal generating device. The length of the signal generating device is shorter than the length of the supporting frame of the drone 1 to avoid the collision of the signal generating device and the signal receiving plate 9 with the ground when the drone 1 lands, causing damage to both.

[0023] In the present invention, when the device is in use, the two pushers 3 are started. Under the control of the control end, the two pushers 3 are driven synchronously, and the pushers 3 push the push rod 4 to move, so that the connecting block 5 moves to allow the signal receiving board 9 and the signal generating device to move downward synchronously, so as to facilitate the detection of the blade. The drone 1 flies over the blade, and the blade is located between the signal receiving board 9 and the signal generating device. The X-ray emitting device 23 emits X-rays, which are received by the signal receiving board 9 after penetrating the blade. The signal receiving board 9 transmits the received signal to the image analyzing device matched therewith. The image analyzing device analyzes the signal and forms an image. At the same time, the camera 13 takes a picture of the blade, and the control end is more capable of taking pictures. The electromagnet 25 on the side wall of the mounting plate 14 is adjusted according to the influence, so that the distance between the electromagnet 25 and the permanent magnet 12 is changed to avoid collision between the device and the blades, and to prevent the distance between the signal receiving board 9 and the signal generating device from being too long, resulting in the received signal not being clear enough. In addition, when the drone 1 is flying, the rotation of the spiral blades will generate vibration, and the buffer spring 24 can buffer the vibration, thereby reducing the influence of the device on the X-ray emitting device 23. At the same time, the connecting plate 18 is pressed on the X-ray emitting device 23 under the action of the buffer spring 24 to prevent the X-ray emitting device 23 from being deflected due to vibration, resulting in the emitted X-ray cannot be received by the signal receiving board 9.

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A non-destructive flaw detection device for wind turbine blades using an unmanned aerial vehicle, comprising an unmanned aerial vehicle (1), characterized in that: The bottom wall of the drone (1) is provided with a fixing groove (2), and two pushers (3) are fixedly connected to the upper inner wall of the fixing groove (2), and the output end of each pusher (3) is fixedly connected to a pushing rod (4), and the other end of each pushing rod (4) is fixedly connected to a connecting block (5), wherein the bottom end of one connecting block (5) is fixedly connected to a mounting plate (6), and the bottom end of the mounting plate (6) is fixedly connected to a fixing plate (7), and the bottom wall of the mounting plate (6) is provided with a fixing groove (8), and a signal receiving plate (9) is also provided below the fixing plate (7), and the signal receiving plate (9) is fixedly connected to the bottom end of the mounting plate (6). The top end extends into the interior of the mounting groove (8), and a plurality of fixing bolts (11) are arranged at the left and right ends of the fixing plate (7), and each of the fixing bolts (11) penetrates the side wall of the corresponding mounting groove (8) and extends into the interior of the mounting groove (8), and the other end of each fixing bolt (11) is rotatably connected to a pressing block (10), and the other ends of the plurality of pressing blocks (10) are tightly arranged with the side wall of the corresponding signal receiving plate (9), and a threaded groove corresponding to the fixing bolt (11) is arranged at the position where each fixing bolt (11) is connected to the fixing plate (7), and the bottom end of another connecting block (5) is slidably connected to a signal generating device; The signal generating device comprises an X-ray emitting device (23); the bottom end of another connecting block (5) is slidably connected to a second mounting plate (14); a sliding block (16) is fixedly connected to the bottom wall of the connecting block (5); a sliding groove (15) corresponding to the second mounting plate (14) is provided at the top end of the second mounting plate (14); two connecting plates (18) are fixedly connected to the bottom wall of the second mounting plate (14); the other ends of the two connecting plates (18) are fixedly connected to a bearing plate (22); the X-ray emitting device (23) is arranged at the top end of the bearing plate (22); and the bearing plate (22) is arranged toward the signal receiving plate (9) and is located on the bearing plate (22). ) and the signal receiving plate (9) are provided with a through groove corresponding thereto, a pressing plate (19) is slidably connected between the two connecting plates (18), a sliding block (20) is fixedly connected to both left and right ends of the pressing plate (19), and a sliding groove (21) matching the two sliding blocks (20) is also provided on the side walls of the two connecting plates (18) close to each other, and a vertically arranged buffer spring (24) is fixedly connected to the top of the pressing plate (19), and the other end of the buffer spring (24) is fixedly connected to the bottom wall of the fixing plate (17), and the bottom wall of the pressing plate (19) is arranged to be in contact with the top of the X-ray emitting device (23); A permanent magnet (12) is fixedly connected to a side wall of the mounting plate 1 (6) close to the mounting plate 2 (14); an electromagnet (25) corresponding to the permanent magnet (12) is also fixedly connected to a side wall of the mounting plate 2 (14) close to the mounting plate 1 (6); two cameras (13) are arranged on the drone (1); both cameras (13) are associated with a control end of the drone (1); the control end is associated with the electromagnet (25); the two cameras (13) are symmetrically arranged about a center line of the drone (1), and the two cameras (13) are arranged obliquely downward.

2. The non-destructive flaw detection equipment for wind turbine blades in UAV according to claim 1 is characterized in that: A layer of buffer pad is fixedly arranged on the bottom wall of the pressing plate (19), and the buffer pad is made of sponge.

3. The non-destructive flaw detection equipment for wind turbine blades in UAV according to claim 1 is characterized in that: The length of the signal receiving plate (9) corresponds to that of the signal generating device, and the length of the signal generating device is shorter than the length of the supporting frame of the drone (1).

4. The non-destructive flaw detection device for wind turbine blades in UAV according to claim 1 is characterized in that: The signal receiving board (9) is provided with an image analysis device matched therewith.

Images