A wind power fan blade nondestructive testing instrument

Abstract

This utility model discloses a non-destructive testing instrument for wind turbine blades, belonging to the technical field of wind turbine blade flaw detectors. Its key technical features include an assembly frame and a base. The assembly frame is threadedly connected to the bottom of the base, and a flaw detection mechanism is threadedly connected to the front side of the assembly frame. An auxiliary mechanism is threadedly connected to the inner wall of the flaw detection mechanism. The flaw detection mechanism includes a mounting ring, a mounting groove, several infrared thermal imagers, several eddy current probes, several ultrasonic probes, a mounting rod, a connecting frame, a motor, and a propeller. By setting up the flaw detection mechanism, non-destructive testing can be performed after the wind turbine blades are installed, avoiding the cumbersome process of disassembling and installing the blades in traditional flaw detection methods. Simultaneously, the flaw detector can be driven by the motor and propeller to fly near the blades and automatically complete the detection, improving flaw detection efficiency and reducing operational difficulty. Multiple detection methods cooperate and cross-verify each other, effectively improving the accuracy of the detection results.

Description

Technical Field

[0001] This utility model relates to the technical field of wind turbine blade flaw detectors, and in particular to a non-destructive flaw detector for wind turbine blades. Background Technology

[0002] A non-destructive testing (NDT) instrument for wind turbine blades is a specialized device for non-destructive testing of wind turbine blades. It mainly utilizes various physical or chemical principles to detect and evaluate internal and surface defects of the blades without damaging their structure and performance. The NDT instrument's structural design is centered on accurate defect detection, and through the coordinated work of its components, it achieves full automation from signal acquisition to defect identification.

[0003] In areas with abundant wind energy, there are small wind turbines used by households. Wind turbines with a power generation capacity of 10 kilowatts or less are called small wind turbines. Small wind turbines mainly consist of the following parts: wind blades, generator, slewing body, speed regulation mechanism, direction adjustment mechanism, braking mechanism, and tower tube.

[0004] The existing patent (publication number: CN210422892U) includes a fairing, a generator housing, bolts, and a tower tube. A generator set fixed inside the generator housing is rotatably connected to the rear center of the fairing via a drive shaft. A fixing ring is fitted onto the outer side of the front end of the generator housing, and a second screw hole is provided on the fixing ring. Three fan blades are fixed in a circular array on the outer side of the fairing, and three fixing blocks are also fixed in a circular array on the outer side of the fairing. The three fan blades and the three fixing blocks are staggered. A first screw hole is provided on each fixing block, and the first screw hole is aligned with a second screw hole, with the thread diameters of the first and second screw holes being identical. One end of the bolt passes through the first and second screw holes, and a nut is threaded onto one end of the bolt, with the nut contacting the back of the fixing ring. This utility model has the advantages of fixing the fan blades during repair, facilitating repair and reducing safety hazards during repair.

[0005] To address the aforementioned issues, existing patents have provided solutions. However, current non-destructive testing methods for wind turbine blades typically involve conducting various wind and temperature tests on the blades before installation, followed by flaw detection using various instruments. Once the blades are installed, flaw detection is not only time-consuming and labor-intensive with low efficiency, but also fails to achieve other effects, making it impractical.

[0006] To address this, a non-destructive testing instrument for wind turbine blades is proposed. Utility Model Content

[0007] The purpose of this invention is to provide a non-destructive testing instrument for wind turbine blades, which can solve the problem that existing non-destructive testing methods for wind turbine blades usually involve conducting various wind force and temperature tests on the blades before installation, and then using various instruments for flaw detection. However, after the blades are installed, flaw detection is not only time-consuming and labor-intensive, but also inefficient and unable to achieve other effects, resulting in insufficient practicality.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a non-destructive testing instrument for wind turbine blades, comprising an assembly frame and a base, wherein the assembly frame is threadedly connected to the bottom of the base, a testing mechanism is threadedly connected to the front side of the assembly frame, and an auxiliary mechanism is threadedly connected to the inner wall of the testing mechanism.

[0009] The flaw detection mechanism includes a mounting ring, a mounting groove, several infrared thermal imagers, several eddy current probes, several ultrasonic probes, a mounting rod, a connecting frame, a motor, and a propeller. The mounting ring is threaded to the front side of the assembly frame. The mounting groove is formed on the inner wall of the mounting ring. The several infrared thermal imagers are fixedly connected to the surface of the mounting ring. The several eddy current probes and several ultrasonic probes are fixedly connected to the inner wall of the mounting groove. The mounting rod is threaded to the four corners of the base. The motor is fixedly connected to the top of the connecting frame. The propeller is threaded to the surface of the motor.

[0010] Preferably, the auxiliary mechanism includes a threaded rod and a threaded hole, the threaded hole being formed in the inner wall of the base and the connecting frame, and the threaded rod being threadedly connected to the inner wall of the connecting frame.

[0011] Preferably, the plurality of eddy current probes and the plurality of ultrasonic probes are respectively fixedly connected to both sides of the plurality of infrared thermal imagers, and a digital signal processor is fixedly connected to the rear side of the assembly frame.

[0012] Preferably, the inner wall of the mounting ring and the assembly frame is provided with a mounting hole, and a mounting rod is threadedly connected to the inner wall of the mounting hole.

[0013] Preferably, the bottom of the base and the inner wall of the assembly frame are provided with limit holes, and the inner wall of the limit holes is threaded with a limit rod.

[0014] Preferably, a high-definition camera is fixedly connected to the top of the base, and a housing is threadedly connected directly above the high-definition camera.

[0015] Preferably, adjustment holes are provided at the four corners of the housing, the four corners of the base, and the inner wall of the connecting frame, and adjustment rods are threadedly connected to the inner walls of the adjustment holes.

[0016] Preferably, the dimensions of the mounting groove are adapted to the dimensions of the eddy current probe and the ultrasonic probe, and the dimensions of the base are larger than the dimensions of the housing.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. By setting up a flaw detection mechanism, this application enables non-destructive testing of the generator fan blades after installation without disassembling the blades. This avoids the tedious process of disassembling and installing the blades in traditional flaw detection methods, saving a lot of time and labor costs. At the same time, the flaw detector can fly to the vicinity of the blades by being driven by a motor and propeller to automatically complete the detection, improving flaw detection efficiency and reducing the difficulty of operation. Multiple detection methods cooperate and cross-verify each other, effectively improving the accuracy of the detection results and reducing the possibility of missed detections and false detections.

[0019] 2. By setting up an auxiliary mechanism, after the flaw detection is completed, the adjustable rod can be rotated to release the limit of the connecting frame, rotate the connecting frame to the top of the base and fix it with the threaded rod, so as to realize the folding and storage of the auxiliary mechanism, reduce the space occupied by the device and make it convenient for users to carry. This design makes the flaw detector not only suitable for fixed occasions of inspection, but also flexible for wind power generation fan blade inspection in different locations, thus improving the practicality of the device. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the non-destructive testing instrument for wind turbine blades of this utility model.

[0021] Figure 2 This is a partial structural diagram of the front side of the mounting ring of this utility model;

[0022] Figure 3 This is a partial structural diagram of the rear side of the mounting ring of this utility model;

[0023] Figure 4 This is a partial structural schematic diagram of the auxiliary mechanism of this utility model;

[0024] Figure 5 This is a partial structural diagram of the auxiliary mechanism of this utility model when it is not in use.

[0025] In the diagram, 1. Flaw detection mechanism; 11. Mounting ring; 12. Mounting groove; 13. Infrared thermal imager; 14. Eddy current probe; 15. Ultrasonic probe; 16. Mounting rod; 17. Connecting frame; 18. Motor; 19. Propeller; 2. Auxiliary mechanism; 21. Threaded rod; 22. Housing; 23. High-definition camera; 24. Digital signal processor; 25. Limiting rod; 26. Threaded hole; 27. Adjusting rod; 3. Assembly frame; 4. Base. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-5 The present invention provides the following technical solution:

[0028] A non-destructive testing instrument for wind turbine blades includes an assembly frame 3 and a base 4. The assembly frame 3 is threadedly connected to the bottom of the base 4. A flaw detection mechanism 1 is threadedly connected to the front side of the assembly frame 3, and an auxiliary mechanism 2 is threadedly connected to the inner wall of the flaw detection mechanism 1.

[0029] The flaw detection mechanism 1 includes a mounting ring 11, a mounting groove 12, several infrared thermal imagers 13, several eddy current probes 14, several ultrasonic probes 15, a mounting rod 16, a connecting frame 17, a motor 18, and a propeller 19. The mounting ring 11 is threaded to the front side of the assembly frame 3. The mounting groove 12 is opened in the inner wall of the mounting ring 11. Several infrared thermal imagers 13 are fixedly connected to the surface of the mounting ring 11. Several eddy current probes 14 and several ultrasonic probes 15 are fixedly connected to the inner wall of the mounting groove 12. The mounting rod 16 is threaded to the four corners of the base 4. The motor 18 is fixedly connected to the top of the connecting frame 17. The propeller 19 is threaded to the surface of the motor 18.

[0030] In this embodiment: several infrared thermal imagers 13, several eddy current probes 14, and several ultrasonic probes 15 are all set in three groups, which can detect and record different fan blades of wind power generation in real time. The mounting frame 3 can be installed by setting the base 4, and the structure on the flaw detection mechanism 1 can be installed by setting the mounting frame 3. The mounting groove 12 can be opened by setting the mounting ring 11, and several eddy current probes 14 and several ultrasonic probes 15 can be installed by opening the mounting groove 12. The mounting ring 11 can be installed by setting the mounting rod 16. The motor 18 can be installed by setting the connecting frame 17, and the propeller 19 can be installed by setting the motor 18. The propeller 19 can make the flaw detector take off and fly to the vicinity of the power generation fan blade.

[0031] Specifically, such as Figure 4 , Figure 5 As shown, the auxiliary mechanism 2 includes a threaded rod 21 and a threaded hole 26. The threaded hole 26 is opened on the inner wall of the base 4 and the connecting frame 17, and the threaded rod 21 is threadedly connected to the inner wall of the connecting frame 17.

[0032] Specifically, such as Figure 1 , Figure 2, Figure 3 As shown, several eddy current probes 14 and several ultrasonic probes 15 are respectively fixedly connected to both sides of several infrared thermal imagers 13, and a digital signal processor 24 is fixedly connected to the rear side of the assembly frame 3.

[0033] Specifically, such as Figure 2 , Figure 3 As shown, mounting holes are provided on the inner walls of mounting ring 11 and assembly frame 3, and mounting rods 16 are threadedly connected to the inner walls of the mounting holes.

[0034] In this embodiment: the threaded rod 21 can be installed by opening the threaded hole 26, and the connecting frame 17 can be installed according to the usage by setting the threaded rod 21. The digital signal processor 24 can process and analyze the signals transmitted from the infrared thermal imager 13, the eddy current probe 14 and the ultrasonic probe 15. The mounting rod 16 can be installed by opening the mounting hole, and the mounting ring 11 and the assembly frame 3 can be assembled by setting the mounting rod 16.

[0035] Specifically, such as Figure 2 , Figure 3 As shown, limit holes are provided on the bottom of the base 4 and the inner wall of the assembly frame 3, and limit rods 25 are threadedly connected to the inner wall of the limit holes.

[0036] Specifically, such as Figure 2 , Figure 4 , Figure 5 As shown, a high-definition camera 23 is fixedly connected to the top of the base 4, and a housing 22 is threadedly connected directly above the high-definition camera 23.

[0037] In this embodiment: the limiting rod 25 can be installed by opening the limiting hole, the assembly frame 3 can be installed on the bottom of the base 4 by setting the limiting rod 25, the detection effect of the generator fan blade can be further improved by setting the high-definition camera 23, and the high-definition camera 23 can be protected by setting the housing 22.

[0038] Specifically, such as Figure 2 , Figure 4 , Figure 5 As shown, adjustment holes are provided at the four corners of the housing 22, the four corners of the base 4, and the inner wall of the connecting frame 17, and adjustment rods 27 are threadedly connected to the inner walls of the adjustment holes.

[0039] Specifically, such as Figure 2 , Figure 4 , Figure 5 As shown, the dimensions of the mounting groove 12 are adapted to the dimensions of the eddy current probe 14 and the ultrasonic probe 15, and the dimensions of the base 4 are larger than the dimensions of the housing 22.

[0040] In this embodiment: by matching the size of the mounting groove 12 with the size of the eddy current probe 14 and the ultrasonic probe 15, the stability of the eddy current probe 14 and the ultrasonic probe 15 can be improved. By making the size of the base 4 larger than the size of the housing 22, the device can be stored on the top of the base 4 after the flaw detection of the generator fan blade is completed, reducing the space occupied by the device. The adjustment rod 27 can be installed by opening the adjustment hole, and the limit of the connecting frame 17 can be controlled by setting the adjustment rod 27.

[0041] Working Principle: When flaw detection is required on the installed generator fan blades, the motor 18 is first powered on and started. The motor 18 drives the propeller 19 to rotate, causing the flaw detector to rise and fly to the vicinity of the generator fan blades. Then, the infrared thermal imager 13, eddy current probe 14, and ultrasonic probe 15 in the flaw detection mechanism 1 begin to work, respectively detecting the surface temperature distribution of the fan blades, defects in the conductive material, and internal defects. The infrared thermal imager 13 uses the difference in heat conduction between the defective area and the normal area to capture abnormal temperature distribution on the surface of the fan blades, thereby identifying hidden defects such as internal cracks and delamination. The eddy current probe 14 uses an alternating magnetic field to generate eddy currents in the conductive material. When there are defects in the metal parts of the fan blades, the distribution of eddy currents and the intensity of the magnetic field will change. The eddy current probe 14 detects abnormal signals and transmits them to the digital signal processor 24. The ultrasonic probe 15 emits ultrasonic waves that penetrate the fan blade material. When encountering defects, the sound waves will be reflected, refracted, or attenuated. The system receives echo signals and transmits them to the digital signal processor 24. The digital signal processor 24 processes and analyzes the signals transmitted from the infrared thermal imager 13, eddy current probe 14, and ultrasonic probe 15. Combined with the image of the fan blade surface captured by the high-definition camera 23, it obtains accurate detection results, including the location, size, and nature of defects. During the flaw detection process, the limiting rod 25 and mounting rod 16 can be used to assemble the device, ensuring the normal operation and detection accuracy of the flaw detector. After the user completes the flaw detection of the generator fan blade, they can rotate the adjusting rod 27 to release the limiting of the connecting frame 17. After adjustment, the user can rotate the connecting frame 17. When rotated to the top of the base 4, the threaded rod 21 can be installed into the inner wall of the threaded hole 26, thereby allowing the auxiliary mechanism 2 to be folded and stored for easy carrying. After the flaw detection is completed, the user turns off the motor 18, causing the flaw detector to descend, completing the non-destructive flaw detection operation on the generator fan blade.

[0042] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A non-destructive testing instrument for wind turbine blades, comprising an assembly frame (3) and a base (4), wherein the assembly frame (3) is threadedly connected to the bottom of the base (4), characterized in that: The front side of the assembly frame (3) is threaded with a flaw detection mechanism (1), and the inner wall of the flaw detection mechanism (1) is threaded with an auxiliary mechanism (2). The flaw detection mechanism (1) includes a mounting ring (11), a mounting groove (12), several infrared thermal imagers (13), several eddy current probes (14), several ultrasonic probes (15), a mounting rod (16), a connecting frame (17), a motor (18), and a propeller (19). The mounting ring (11) is threaded to the front side of the assembly frame (3). The mounting groove (12) is opened on the inner wall of the mounting ring (11). The several infrared thermal imagers (13) are fixedly connected to the surface of the mounting ring (11). The several eddy current probes (14) and several ultrasonic probes (15) are fixedly connected to the inner wall of the mounting groove (12). The mounting rod (16) is threaded to the four corners of the base (4). The motor (18) is fixedly connected to the top of the connecting frame (17). The propeller (19) is threaded to the surface of the motor (18).

2. The wind power fan blade nondestructive testing instrument according to claim 1, characterized in that: The auxiliary mechanism (2) includes a threaded rod (21) and a threaded hole (26). The threaded hole (26) is opened on the inner wall of the base (4) and the connecting frame (17). The threaded rod (21) is threadedly connected to the inner wall of the connecting frame (17).

3. The wind power fan blade nondestructive testing instrument according to claim 1, characterized in that: The plurality of eddy current probes (14) and the plurality of ultrasonic probes (15) are respectively fixedly connected to both sides of the plurality of infrared thermal imagers (13), and a digital signal processor (24) is fixedly connected to the rear side of the assembly frame (3).

4. The wind power fan blade nondestructive testing instrument according to claim 1, characterized in that: The inner walls of the mounting ring (11) and the assembly frame (3) are provided with mounting holes, and the inner walls of the mounting holes are threaded with mounting rods (16).

5. The wind power fan blade non-destructive testing instrument according to claim 1, characterized in that: Limiting holes are provided at the bottom of the base (4) and on the inner wall of the assembly frame (3), and a limiting rod (25) is threadedly connected to the inner wall of the limiting hole.

6. The wind power fan blade nondestructive testing instrument according to claim 1, characterized in that: A high-definition camera (23) is fixedly connected to the top of the base (4), and a housing (22) is threadedly connected to the top of the high-definition camera (23).

7. The wind power fan blade non-destructive testing instrument according to claim 6, characterized in that: Adjustment holes are provided at the four corners of the housing (22), the four corners of the base (4), and the inner wall of the connecting frame (17), and adjustment rods (27) are threadedly connected to the inner wall of the adjustment holes.

8. The wind power fan blade non-destructive testing instrument according to claim 1, characterized in that: The dimensions of the mounting slot (12) are adapted to the dimensions of the eddy current probe (14) and the ultrasonic probe (15), and the dimensions of the base (4) are larger than the dimensions of the housing (22).

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