A kind of blade surface defect detection device for unmanned aerial vehicle

Abstract

The application relates to the technical field of blade detection, in particular to a blade surface defect detection device for an unmanned aerial vehicle, which comprises a detection machine, a storage plate is fixedly installed on the inner bottom surface of the detection machine, a shooting detection mechanism is arranged on the inner top surface of the detection machine, a placing concave surface is arranged in the middle of the upper surface of the storage plate, side openings are arranged on the upper surface of the storage plate and close to the two sides of the placing concave surface, a front opening is arranged on the upper surface of the storage plate and close to the front of the placing concave surface, and recessed surfaces are arranged on the sides away from the side openings. The application can realize automatic turning of the blade, does not need manual intervention in the whole process, effectively improves the detection efficiency, reduces the labor intensity, avoids the influence on the telecentric lens imaging of the detection light path without a shielding structure, guarantees the detection precision, avoids the pollution and secondary damage of the blade surface caused by manual turning, and improves the detection quality and the product yield.

Description

Technical Field

[0001] This invention relates to the field of blade inspection technology, and more particularly to a blade surface defect inspection device for unmanned aerial vehicles (UAVs). Background Technology

[0002] Surface defect detection on the blades of dual-blade drones is a crucial step in the manufacturing and maintenance process. Currently, the industry primarily employs a detection scheme combining telecentric lens imaging and image recognition for surface defect detection of dual-blade drones. Telecentric lenses are the mainstream optical equipment choice for high-precision inspection of drone blades.

[0003] The inspection process requires comprehensive imaging and inspection of both the upper and lower surfaces of the two blades in stages. However, existing inspection equipment lacks an automated flipping mechanism adapted to the double-blade structure, making it impossible to achieve smooth and precise blade flipping. Manual flipping using tweezers or other tools is cumbersome, time-consuming, and labor-intensive, significantly reducing inspection efficiency. Direct manual flipping is also susceptible to surface contamination from dust and other impurities on gloves, affecting the inspection results. Using traditional flipping fixtures for mechanical flipping is problematic due to their large size, making them difficult to adapt to the special structure of double-blade blades, and causing issues such as blade jamming and damage during the flipping process. Furthermore, the fixtures themselves can block the inspection light from the telecentric lens, leading to uneven image brightness and shadow interference. Therefore, a blade surface defect inspection device for unmanned aerial vehicles (UAVs) is proposed. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by proposing a blade surface defect detection device for unmanned aerial vehicles (UAVs).

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a blade surface defect detection device for unmanned aerial vehicles (UAVs), comprising a detection machine, a placement plate fixedly installed on the inner bottom surface of the detection machine, a shooting detection mechanism provided on the inner top surface of the detection machine, a placement concave surface opened in the middle of the upper surface of the placement plate, side openings opened on the upper surface of the placement plate near the placement concave surface on both sides, a front opening opened on the upper surface of the placement plate near the front of the placement concave surface, and recessed surfaces opened on the sides of the two side openings that are far apart from each other, a lifting plate installed below the placement concave surface via a lifting mechanism, a synchronous belt extending obliquely upward and forward connected to the upper surface of the lifting plate corresponding to the front opening via a transmission mechanism, a plurality of levers equidistantly connected to the outer surface of the synchronous belt, and I-beams fixedly connected to the upper surface of the lifting plate corresponding to the two side openings, and a set of arc-shaped blocks symmetrically connected to the upper surface of each I-beam, the distance between the two arc-shaped blocks in each set being controlled by an adjustment mechanism; When the synchronous belt moves, the pusher blocks push the blade roots forward and upward, causing the blades to be flipped over, and the blade bodies on both sides of the blades are limited to the inside of each set of arc-shaped blocks. When the blade is flipped over and its trailing edge faces down, the concave surface provides clearance for the trailing edge.

[0006] Preferably, the imaging and detection mechanism includes a lifting cylinder fixedly installed on the upper surface of the detection machine, a lifting platform fixedly installed on the telescopic end of the lifting cylinder, a telecentric lens fixedly installed on the lower surface of the lifting platform, and the lifting platform slidingly engaging with the inner wall of the detection machine.

[0007] Preferably, the lifting mechanism includes a stabilizing cylinder and a telescopic cylinder fixedly disposed on the lower surface of the shelf. A guide rod is slidably inserted into the lower end of the stabilizing cylinder. The lower end of the guide rod and the telescopic end of the telescopic cylinder are respectively fixedly connected to both sides of the upper surface of the lifting plate.

[0008] Preferably, the transmission mechanism includes an inclined frame fixedly connected to the middle of the upper surface of the lifting plate. Synchronous wheels are respectively provided at the upper and lower ends of the inner side of the inclined frame. A wheel axle is fixedly passed through the central shaft of the synchronous wheel. The two ends of the wheel axle are respectively rotatably engaged with the inclined frame. A mounting plate is fixedly provided at the lower end of one side surface of the inclined frame. A servo motor is fixedly mounted on one side of the mounting plate. The output shaft of the servo motor is fixedly connected to one end of the wheel axle.

[0009] Preferably, the timing belt and the shift block are integrally formed, and the timing belt and the shift block are made of wear-resistant flexible polymer material.

[0010] Preferably, the upper surface of the I-beam frame is provided with a sliding opening, and the lower end of the arc-shaped stop is fixedly connected to a slider, which slides in cooperation with the inner side of the sliding opening.

[0011] Preferably, the adjusting mechanism includes a mounting base fixedly connected to the side of an I-beam frame. A bidirectional cylinder is fixedly passed through the inner side of the mounting base. A synchronizing frame is fixedly connected to the outer surfaces of the two sliders at the front and rear. A bending part is fixedly provided at one end of the synchronizing frame near the bidirectional cylinder. The telescopic end of the bidirectional cylinder is fixedly connected to the outer surface of the bending part.

[0012] Preferably, a baffle is fixedly connected to the upper surface of the lifting plate and near the rear of the synchronous belt. The upper end of the baffle slides through the surface of the storage plate, and the front surface of the baffle has a V-shaped surface.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention enables automated blade flipping, eliminating the need for manual operation, significantly improving detection efficiency and reducing manual labor intensity; 2. This invention has no light-blocking structure during the detection process, thus avoiding blocking the detection light of the telecentric lens and ensuring detection accuracy; 3. This invention avoids the problems of leaf surface contamination and secondary damage caused by manual turning. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a blade surface defect detection device for an unmanned aerial vehicle (UAV) according to the present invention. Figure 2 This is a cross-sectional view of the mounting plate of a blade surface defect detection device for an unmanned aerial vehicle according to the present invention; Figure 3 This is a cross-sectional view of the concave surface of a blade surface defect detection device for an unmanned aerial vehicle (UAV) according to the present invention. Figure 4 This is a schematic diagram of the lifting plate of a blade surface defect detection device for unmanned aerial vehicles according to the present invention; Figure 5 This is a schematic diagram of the arc-shaped stop of a blade surface defect detection device for unmanned aerial vehicles according to the present invention; Figure 6 This is a schematic diagram of the placement concave surface of a blade surface defect detection device for a drone according to the present invention; Figure 7 This is a schematic diagram of the blade arrangement of a blade surface defect detection device for a drone according to the present invention; Figure 8 This is a diagram showing the state of a blade flipping during the operation of a blade surface defect detection device for an unmanned aerial vehicle (UAV) according to the present invention. Figure 9 This is a side view of a blade of a blade surface defect detection device for an unmanned aerial vehicle (UAV) according to the present invention. Figure 10 This is a front view of the blade arrangement of a blade surface defect detection device for a drone according to the present invention; Figure 11 This is a front view of a blade flipping device for detecting surface defects in the blades of an unmanned aerial vehicle (UAV) according to the present invention.

[0015] The components are: 1. Inspection machine; 2. Telecentric lens; 3. Placement plate; 4. Concave surface; 5. Placement concave surface; 6. Side opening; 7. Front opening; 8. Lifting plate; 9. Telescopic cylinder; 10. Stabilizing cylinder; 11. Guide rod; 12. I-beam frame; 13. Sliding mouth; 14. Arc-shaped stop block; 15. Slider; 16. Synchronous frame; 17. Bending part; 18. Two-way cylinder; 19. Mounting base; 20. Inclined frame; 21. Synchronous pulley; 22. Wheel axle; 23. Synchronous belt; 24. Pulley; 25. Servo motor; 26. Mounting plate; 27. Baffle; 28. V-shaped surface; 29. ​​Lifting platform; 30. Lifting cylinder; 31. Blade; 311. Blade root; 312. Blade body; 3121. Leading edge; 3122. Trailing edge. Detailed Implementation

[0016] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0017] like Figures 1-11 The device shown is for detecting surface defects on blades of a drone. It includes a detection machine 1. A placement plate 3 is fixedly installed on the inner bottom surface of the detection machine 1. A shooting detection mechanism is provided on the inner top surface of the detection machine 1. A placement concave surface 5 is opened in the middle of the upper surface of the placement plate 3. Side openings 6 are opened on the upper surface of the placement plate 3 and on both sides near the placement concave surface 5. A front opening 7 is opened on the upper surface of the placement plate 3 and in front of the placement concave surface 5. A recessed surface 4 is opened on the side of the two side openings 6 that are far apart. A lifting plate 8 is installed below the placement concave surface 5 through a lifting mechanism. A synchronous belt 23 extending upward and forward is connected to the upper surface of the lifting plate 8 and corresponding to the front opening 7 through a transmission mechanism. Several levers 24 are equidistantly connected to the outer surface of the synchronous belt 23. I-frames 12 are fixedly connected to the upper surface of the lifting plate 8 and corresponding to the two side openings 6. A set of arc-shaped blocks 14 symmetrically connected to the upper surface of each I-frame 12 are slidably connected. The distance between the two arc-shaped blocks 14 in each set is controlled by an adjustment mechanism. Leaf 31 Figure 7 , Figure 8 As shown, the blade includes a blade root 311, and blade bodies 312 are fixedly connected to both sides of the blade root 311. The upper and lower edges of the blade body 312 are the trailing edge 3122 and the leading edge 3121, respectively. The leading edge 3121 is the side that cuts into the airflow first when the blade 31 is working. It has a rounded and thick profile and has good impact resistance and aerodynamic stability. It can effectively reduce airflow disturbance and wear. The trailing edge 3122 is the air outlet side at the end of the blade 31. It is relatively thin and sharp and is mainly used to straighten the airflow, reduce wake vortices and resistance, and ensure the operating efficiency of the blade 31. The two work together to achieve stable aerodynamic performance.

[0018] When the timing belt 23 moves, the pusher block 24 pushes the blade root 311 of the blade 31 forward and upward, causing the blade 31 to be flipped over, and the blade body 312 on both sides of the blade 31 is limited to the inside of each set of arc-shaped blocks 14. Turn over and place the front leaf 31 as follows Figure 10 As shown, when blade 31 is flipped over and its trailing edge 3122 faces downwards, as... Figure 11 As shown, the concave surface 4 provides clearance space for the trailing edge 3122. The imaging and inspection mechanism includes a lifting cylinder 30 fixedly mounted on the upper surface of the inspection machine 1. A lifting platform 29 is fixedly mounted on the telescopic end of the lifting cylinder 30, and a telecentric lens 2 is fixedly mounted on the lower surface of the lifting platform 29 for accurately acquiring images of the blade 31 to be inspected. The lifting platform 29 slides vertically against the inner wall of the inspection machine 1 and can move smoothly up and down under the drive of the lifting cylinder 30, achieving precise adjustment of the height of the telecentric lens 2. The telecentric lens 2 is the core optical component of the industrial machine vision inspection system, specifically designed for defect detection. The telecentric lens 2 integrates a coaxial or ring-shaped ambient light source, which can directly and uniformly illuminate the blade 31 of the UAV below, effectively eliminating surface reflections and shadow interference, and ensuring clear imaging. The lifting mechanism includes a stabilizing cylinder 10 and a telescopic cylinder 9 fixedly installed on the lower surface of the shelf 3. A guide rod 11 is slidably inserted into the lower end of the stabilizing cylinder 10. The guide rod 11 can slide smoothly up and down along the inner wall of the stabilizing cylinder 10, providing reliable guidance for the overall movement. The lower end of the guide rod 11 and the telescopic end of the telescopic cylinder 9 are respectively fixedly connected to both sides of the upper surface of the lifting plate 8. Driven by the telescopic cylinder 9, the lifting plate 8 is driven to rise and fall smoothly, effectively avoiding shaking and deviation during operation. The transmission mechanism includes an inclined frame 20 fixedly connected to the middle of the upper surface of the lifting plate 8. Synchronous wheels 21 are respectively provided at the upper and lower ends of the inner side of the inclined frame 20. The central shaft of the synchronous wheel 21 is fixedly connected to a wheel axle 22. The two ends of the wheel axle 22 are respectively rotatably engaged with the inclined frame 20 to ensure the smooth operation of the synchronous wheel 21. A mounting plate 26 is fixedly provided at the lower end of one side surface of the inclined frame 20. A servo motor 25 is fixedly installed on one side of the mounting plate 26. The output shaft of the servo motor 25 is fixedly connected to one end of the wheel axle 22 to provide stable power output to the synchronous wheel 21. The synchronous belt 23 and the shift block 24 are integrally formed structures with no splicing gaps between them. The structure has high strength and good operational consistency. The synchronous belt 23 and the shift block 24 are made of wear-resistant and flexible polymer materials, which not only have good transmission fit, but also meet the usage requirements of the driving blade root 311. The upper surface of the I-beam frame 12 is provided with a sliding opening 13, which is a long strip-shaped guide groove. The lower end of the arc-shaped stop block 14 is fixedly connected to a slider 15, which slides and engages with the inner side of the sliding opening 13 to facilitate the flexible adjustment of the arc-shaped stop block 14. The adjustment mechanism includes a mounting base 19 fixedly connected to the side of an I-frame 12. A bidirectional cylinder 18 is fixedly inserted through the inner side of the mounting base 19 to provide power for the overall adjustment action. The outer surfaces of the two sliders 15 at the front and rear are fixedly connected to a synchronous frame 16, so that the sliders 15 on both sides can move synchronously. A bending part 17 is fixedly provided at the end of the synchronous frame 16 near the bidirectional cylinder 18. The telescopic end of the bidirectional cylinder 18 is fixedly connected to the outer surface of the bending part 17 to realize the rapid and precise adjustment of the distance between the arc-shaped stops 14. A baffle 27 is fixedly connected to the upper surface of the lifting plate 8 and near the rear of the synchronous belt 23. The baffle 27 moves up and down synchronously with the lifting plate 8. The upper end of the baffle 27 slides through the surface of the shelf 3. A V-shaped surface 28 is provided on the front surface of the baffle 27, which can position and guide the blade 31, effectively constrain the position of the blade 31, and prevent the blade 31 from shifting laterally when flipping. During the inspection, the staff placed the blade 31 on the placement plate 3. Specifically, the central axis of the blade root 311 was vertical, and its lower end face was placed in the placement concave surface 5. The blade bodies 312 on both sides passed between each set of arc-shaped blocks 14. Then, the telescopic cylinder 9 was extended, causing the lifting plate 8 to descend, which in turn caused the arc-shaped blocks 14, baffles 27, synchronous belts 23, and other structures to move down synchronously. After the movement, the arc-shaped blocks 14 entered the inner side of the side opening 6, and the upper end of the baffle 27 was not higher than the upper surface of the placement concave surface 5. Synchronous belt 23 and lever 24 enter the inner side of front opening 7. At this time, there are no obstructions around the blade root 311 and blade body 312, which can avoid obstructing the detection light. Control the extension of lifting cylinder 30 to make lifting platform 29 and telecentric lens 2 move down to take pictures of the upper surface of blade 31. During the shooting process, the light ring around the camera end of telecentric lens 2 illuminates synchronously. With the unobstructed blade root 311 and blade body 312, the shooting picture is clear, ensuring the accuracy of subsequent surface defect detection.

[0019] After one side of blade 31 is inspected, the telescopic cylinder 9 retracts, causing the arc-shaped stop 14, baffle 27, synchronous belt 23, and other structures to move upwards and reset synchronously. Then, the servo motor 25 is controlled to operate, and under the transmission of the synchronous pulley 21, the synchronous belt 23 moves, driving the upper surface paddle 24 to move forward and upward. When it contacts the lower end of the blade root 311, it causes the blade root 311 to roll. Figure 8As shown, the blades 312 on both sides are limited and rolled between each set of arc-shaped blocks 14. When the central axis of the blade root 311 is in the front-back direction, the leading edge 3121 of one blade 312 and the trailing edge 3122 of the other blade 312 are at the bottom. However, the recessed surface 4 provides space for movement to ensure that the rotation of the blade root 311 is not hindered. The synchronous belt 23 continues to run at this time, and the pusher block 24 contacts the blade root 311 to make it continue to roll until the flipping action of the blade root 311 is completed, thereby making the entire blade 31 flip. The servo motor 25 stops running, and then the telescopic cylinder 9 is extended to make the lifting plate 8 descend, which drives the arc-shaped blocks 14, the baffle 27, the synchronous belt 23 and other structures to move down synchronously. At this time, the side of the blade 31 that was originally at the bottom is facing up, and the upward inspection can be performed. The comprehensive inspection of the upper and lower surface defects of a single blade 31 is completed.

[0020] By controlling the extension and retraction of the bidirectional cylinder 18, the operator drives the two bent sections 17 to move closer or further apart, thereby moving the synchronizing frame 16. This achieves the synchronous approach or separation of the arc-shaped stops 14. Through adjustment, the problem of affecting the flipping action due to excessively tight limiting of the blade body 312, or causing excessive swing amplitude of the blade body 312 due to excessively loose limiting, can be avoided. During the adjustment process, the arc-shaped stops 14 do not need to be tightly attached to the edge of the blade body 312; they only need to limit and suppress excessive swing.

[0021] During the blade 31 flipping inspection process, no manual operation is required. The blade 31 flipping and double-sided inspection can be completed automatically, which effectively improves inspection efficiency, reduces manual labor intensity, and avoids secondary damage or contamination to the surface of blade 31 during manual flipping.

[0022] During the flipping process of the blade root 311, the V-shaped surface 28 acts as a block and limiter, which can guide the blade root 311 to land stably in the middle position of the placement concave surface 5 after flipping. This effectively avoids the problem of the blade root 311 shifting to one side or even falling off the placement concave surface 5 when the push block 24 is pushed, and further ensures the stability and reliability of the rolling flipping of the blade 31.

[0023] It should be added that, because the leaf blade 312 narrows and transitions near the leaf root 311, from the front view, both the upper and lower ends of the leaf root 311 extend beyond the edge of the leaf blade 312 where it connects with it. Therefore, as... Figure 10 , Figure 11 As shown, even if the two sides of the concave surface 5 are raised structures, it will not interfere with the contact between the lower end of the blade root 311 and the surface of the concave surface 5 when the blade 31 is placed.

[0024] When in use, when the staff initially places the blade 31, it will not affect the normal inspection operation regardless of whether the leading edge 3121 or the trailing edge 3122 of the blade body 312 faces downwards; during the flipping process of the blade 31 and after the flipping is completed, the concave surface 4 can provide clearance space for the trailing edge 3122 to avoid motion interference.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A blade surface defect detection device for unmanned aerial vehicles (UAVs), comprising a detection machine (1), characterized in that: A placement plate (3) is fixedly installed on the inner bottom surface of the inspection machine (1). A shooting inspection mechanism is provided on the inner top surface of the inspection machine (1). A placement concave surface (5) is provided in the middle of the upper surface of the placement plate (3). Side openings (6) are provided on both sides of the upper surface of the placement plate (3) near the placement concave surface (5). A front opening (7) is provided on the upper surface of the placement plate (3) near the front of the placement concave surface (5). A recessed surface (4) is provided on the side of the two side openings (6) that are far apart from each other. A lift is provided below the placement concave surface (5). The structure is equipped with a lifting plate (8). The upper surface of the lifting plate (8) and the corresponding front opening (7) are connected to a synchronous belt (23) that extends obliquely upwards and forwards via a transmission mechanism. The outer surface of the synchronous belt (23) is equidistantly connected with several paddle blocks (24). The upper surface of the lifting plate (8) is fixedly connected to two side openings (6) respectively with I-frames (12). The upper surface of each I-frame (12) is slidably connected with a set of arc-shaped blocks (14) that are symmetrical in front and behind. The distance between the two arc-shaped blocks (14) in each set is controlled by an adjustment mechanism. When the synchronous belt (23) moves, the pusher (24) pushes the blade root (311) of the blade (31) forward and upward, so that the blade (31) is turned over and the blade body (312) on both sides of the blade (31) is limited to the inside of each set of arc-shaped blocks (14). When the blade (31) is flipped over and its trailing edge (3122) faces downward, the concave surface (4) provides clearance space for the trailing edge (3122).

2. The blade surface defect detection device for unmanned aerial vehicles according to claim 1, characterized in that: The imaging and detection mechanism includes a lifting cylinder (30) fixedly installed on the upper surface of the detection machine (1). A lifting platform (29) is fixedly installed on the telescopic end of the lifting cylinder (30). A telecentric lens (2) is fixedly installed on the lower surface of the lifting platform (29). The lifting platform (29) slides vertically with the inner wall of the detection machine (1).

3. The blade surface defect detection device for unmanned aerial vehicles according to claim 1, characterized in that: The lifting mechanism includes a stabilizing cylinder (10) and a telescopic cylinder (9) fixedly installed on the lower surface of the shelf (3). A guide rod (11) is slidably inserted into the lower end of the stabilizing cylinder (10). The lower end of the guide rod (11) and the telescopic end of the telescopic cylinder (9) are respectively fixedly connected to both sides of the upper surface of the lifting plate (8).

4. The blade surface defect detection device for unmanned aerial vehicles according to claim 1, characterized in that: The transmission mechanism includes an inclined frame (20) fixedly connected to the middle of the upper surface of the lifting plate (8). The upper and lower ends of the inner side of the inclined frame (20) are respectively provided with synchronous wheels (21). The central shaft of the synchronous wheel (21) is fixedly connected to a wheel axle (22). The two ends of the wheel axle (22) are respectively rotatably engaged with the inclined frame (20). A mounting plate (26) is fixedly provided at the lower end of one side surface of the inclined frame (20). A servo motor (25) is fixedly installed on one side of the mounting plate (26). The output shaft of the servo motor (25) is fixedly connected to one end of the wheel axle (22).

5. The blade surface defect detection device for unmanned aerial vehicles according to claim 1, characterized in that: The synchronous belt (23) and the shift block (24) are integrally formed structures, and the synchronous belt (23) and the shift block (24) are made of wear-resistant flexible polymer material.

6. The blade surface defect detection device for unmanned aerial vehicles according to claim 1, characterized in that: The upper surface of the I-beam frame (12) is provided with a sliding opening (13), and the lower end of the arc-shaped stop block (14) is fixedly connected with a slider (15), and the slider (15) slides in cooperation with the inner side of the sliding opening (13).

7. The blade surface defect detection device for unmanned aerial vehicles according to claim 6, characterized in that: The adjusting mechanism includes a mounting base (19) fixedly connected to the side of an I-frame (12). A bidirectional cylinder (18) is fixedly passed through the inner side of the mounting base (19). The outer surfaces of the two sliders (15) at the front and rear are fixedly connected to a timing frame (16). A bending part (17) is fixedly provided at one end of the timing frame (16) near the bidirectional cylinder (18). The telescopic end of the bidirectional cylinder (18) is fixedly connected to the outer surface of the bending part (17).

8. The blade surface defect detection device for unmanned aerial vehicles according to claim 1, characterized in that: A baffle (27) is fixedly connected to the upper surface of the lifting plate (8) and near the rear of the synchronous belt (23). The upper end of the baffle (27) slides through the surface of the storage plate (3), and a V-shaped surface (28) is opened on the front surface of the baffle (27).

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