Blade strength detection device for wind driven generator

Abstract

The invention relates to the technical field of wind driven generator testing, in particular to a wind driven generator blade strength detection device which comprises a testing cabinet and further comprises two bottom plates symmetrically and movably arranged in the testing cabinet, the two bottom plates are each provided with a movable mechanism, and the movable mechanisms are connected with clamping air cylinders; the transverse moving plate is movably arranged in the test cabinet, a swing plate is arranged on the transverse moving plate, and a chuck used for clamping a detection point between the two ends of the to-be-tested blade is arranged on the swing plate; according to the invention, the two opposite movable mechanisms are arranged, the two opposite movable mechanisms can be connected with the two ends of the blade during detection, and a plurality of different detection points in the length direction of the blade are clamped through the chucks, so that the rotation center of the blade is changed along with the clamping of different detection points each time, and the detection accuracy is improved. As long as the fulcrum of a lever changes continuously, different parts of the blade can be detected comprehensively by detecting the positions of the fulcrums.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of testing of wind power generators, in particular to a wind power generator blade strength detection device. BACKGROUND

[0002] A wind power generator is a core device of the wind energy industry, which converts wind energy into electrical energy. The blade of the wind power generator is a key component, which rotates to drive the generator to generate electricity under the action of wind. However, the wind power generator blade will be subjected to complex external disturbances in actual operation, such as wind speed variation, wind direction deviation, turbulence, etc. These disturbances will cause the blade to bear uneven aerodynamic force, centrifugal force and vibration, etc. complex stress, which may cause the blade to crack, deform or even break, thereby affecting the performance and power generation efficiency of the wind power generator, and even causing safety accidents.

[0003] Therefore, the blade equipped with the wind power generator needs to meet certain strength, and the strength detection of the wind power generator blade is a very important work. For large blades, most of them focus on performance evaluation under complex structure and high load conditions of large blades. For small and medium-sized blades, more flexible and efficient detection needs to be carried out in combination with their application scenarios. At present, when detecting small and medium-sized wind power generator blades, static load is usually applied to the blade, and then whether the blade cracks, breaks or other structural failure phenomena occur is detected to reflect the strength performance of the blade. However, this detection method is biased towards static state, it is difficult to simulate the dynamic stress of the blade, and the detection position is single, it is difficult to comprehensively reflect the complex load borne by the blade in the actual use environment, and then the reference of the detection result is not high compared with the actual use of the blade. SUMMARY

[0004] The purpose of the present application is to provide a wind power generator blade strength detection device to solve the problems raised in the background.

[0005] To achieve the above purpose, the present application provides the following technical scheme: The wind power generator blade strength detection device comprises a test cabinet, and further comprises: Two bottom plates symmetrically movably arranged in the test cabinet, a set of movable mechanisms are respectively arranged on the two bottom plates, and the movable mechanisms are connected with clamping cylinders for clamping the end portions of the blade to be tested; A horizontal moving plate movably arranged in the test cabinet, a swing plate is arranged on the horizontal moving plate, a chuck for clamping detection points between the two ends of the blade to be tested is arranged on the swing plate, the swing plate can be driven by a power mechanism arranged on the horizontal moving plate, so that the chuck drives the blade to swing, and the horizontal moving plate can be driven by a screw driving mechanism arranged in the test cabinet to move along the length direction of the blade, so that the chuck clamps a plurality of detection points between the two ends of the blade one by one; The activity detector is arranged on the transverse plate, and the transverse plate is further provided with a transposition mechanism.

[0006] As a further scheme of the present application, the power mechanism comprises a rotating shaft rotatably arranged on the transverse plate and a sleeve shaft slidably sleeved with the rotating shaft, and a transmission structure is arranged between the sleeve shaft and the rotating shaft; The sleeve shaft is fixed with the swing plate and connected with the transposition mechanism, and a driving motor is further arranged on the side of the transverse plate, and the rotating shaft is connected with the output end of the driving motor.

[0007] As a further scheme of the present application, the transmission structure comprises two strip-shaped protrusions formed on the outer wall of the rotating shaft and two strip-shaped grooves arranged on the inner wall of the sleeve shaft, the strip-shaped grooves are matched with the strip-shaped protrusions, and the two are parallel with the central axes of the rotating shaft and the sleeve shaft.

[0008] As a further scheme of the present application, the transposition mechanism comprises a pneumatic assembly arranged on the transverse plate and connected with the sleeve shaft and a follow-up structure connected between the pneumatic assembly and the detector, and the pneumatic assembly can drive the swing plate and the detector to move synchronously but in different directions.

[0009] As a further scheme of the present application, the pneumatic assembly comprises a second air cylinder hingedly arranged on the transverse plate and a connecting plate hingedly connected with the moving end of the second air cylinder, the connecting plate is rotatably connected with the sleeve shaft and connected with the follow-up structure.

[0010] As a further scheme of the present application, the follow-up structure comprises a guide plate fixed on the transverse plate, the guide plate is arranged in a shape similar to a "U" and is provided with a first sliding groove and a second sliding groove perpendicular to each other, and a first sliding block and a second sliding block are respectively slidably embedded in the first sliding groove and the second sliding groove.

[0011] As a further scheme of the present application, the first sliding block is fixed with the connecting plate, and a first connecting rod is arranged between the first sliding block and the second sliding block, and the two ends of the first connecting rod are respectively hingedly connected with the first sliding block and the second sliding block. The guide plate is further slidably sleeved with a sleeve plate, the detector and the probe are arranged on the sleeve plate, a second connecting rod is arranged between the sleeve plate and the second sliding block, and the two ends of the second connecting rod are respectively hingedly connected with the sleeve plate and the second sliding block.

[0012] As a further scheme of the present application: the test cabinet is provided with a guide groove, the bottom plate is slidably embedded in the guide groove, and the movable mechanism comprises two vertical arms fixed to the bottom plate and symmetrically arranged; Slideways are arranged on the two vertical arms along the length direction of the vertical arms, movable blocks are slidably embedded in the slideways, and the clamping cylinder is arranged between the two movable blocks through an assembly structure.

[0013] As a further scheme of the present application: the assembly structure comprises an assembly plate fixedly connecting the two movable blocks, a mounting plate is rotatably arranged on the side of the assembly plate through a shaft pin, and the clamping cylinder is fixed to the mounting plate.

[0014] As a further scheme of the present application: the vertical arm is further provided with a supporting piece, the supporting piece comprises a limiting block slidably embedded in the slideway and a first cylinder fixed to the side of the vertical arm, the movable end of the first cylinder is fixed to the limiting block, and the limiting block is located below the movable block.

[0015] Compared with the prior art, the present application has the following beneficial effects: By arranging two opposite movable mechanisms, the two opposite movable mechanisms can be connected to the two ends of the blade during detection, and a plurality of different detection points in the length direction of the blade are clamped by the clamping head, so that the rotation center of the blade changes each time different detection points are clamped, like the fulcrum of a lever is constantly changing. By detecting the position of each fulcrum, the different parts of the blade can be comprehensively detected to ensure that the strength and integrity of the blade at different fulcrum positions are fully detected, and the detection blind spot caused by fixed fulcrum detection is avoided. Combined with ultrasonic flaw detection technology, the strength performance of small and medium-sized blades can be efficiently and accurately evaluated. By simulating the swinging condition of multiple fulcrums, the stress state and swinging condition of the blade in actual work can be more realistically simulated. Compared with the traditional fixed fulcrum detection, this multiple fulcrum detection method can more accurately reflect the complex load borne by the blade in the actual use environment, and provide more reliable data support for the strength evaluation of the blade. In addition, the present application is provided with the transposition mechanism to realize the synchronous regulation of the position of the clamping head and the probe. On the premise of avoiding damage to the probe when the blade and the swinging plate swing, the smoothness and accuracy of the flaw detection are ensured, the ultrasonic wave can be efficiently transmitted in the propagation medium, and the authenticity and effectiveness of the detection result are improved. The two groups of movable mechanisms can effectively support the blade without affecting the swinging of the blade. After the swinging of the blade is completed, the blade does not need to be transferred by the staff for flaw detection, so that the accuracy of the probe in detecting the detection point is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Structure diagram of one embodiment of the wind turbine blade strength detection device.

[0017] Figure 2 Structure diagram of one embodiment of the wind turbine blade strength detection device from another angle.

[0018] Figure 3 Structure diagram of one embodiment of the wind turbine blade strength detection device from yet another angle.

[0019] Figure 4 Structure diagram of one embodiment of the wind turbine blade strength detection device. Figure 3 Structure diagram of one embodiment of the wind turbine blade strength detection device.

[0020] Figure 5 Structure diagram of one embodiment of the wind turbine blade strength detection device.

[0021] Figure 6 Structure diagram of one embodiment of the wind turbine blade strength detection device. Figure 5 Structure diagram of one embodiment of the wind turbine blade strength detection device.

[0022] Figure 7 Structure diagram of one embodiment of the wind turbine blade strength detection device.

[0023] Figure 8 Structure diagram of one embodiment of the wind turbine blade strength detection device. Figure 7 Structure diagram of one embodiment of the wind turbine blade strength detection device.

[0024] Figure 9 Structure diagram of one embodiment of the wind turbine blade strength detection device.

[0025] Figure 10 Structure diagram of one embodiment of the wind turbine blade strength detection device. Figure 9 Structure diagram of one embodiment of the wind turbine blade strength detection device.

[0026] Figure 11 Structure diagram of one embodiment of the wind turbine blade strength detection device.

[0027] In the figure: 1, test cabinet; 2, guide groove; 3, bottom plate; 4, vertical arm; 5, movable block; 6, assembly plate; 7, shaft pin; 8, mounting plate; 9, clamping cylinder; 10, first cylinder; 11, limit block; 12, transverse moving plate; 13, guide plate; 1301, first sliding groove; 1302, second sliding groove; 14, first sliding block; 15, second sliding block; 16, second cylinder; 17, driving motor; 18, swing plate; 19, rotating shaft; 1901, strip-shaped protrusion; 20, sleeve shaft; 2001, strip-shaped groove; 21, connecting plate; 22, chuck; 23, sleeve plate; 24, detector; 25, probe; 26, first connecting rod; 27, second connecting rod. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0029] In addition, elements in the present application are referred to as "fixed to" or "disposed on" another element, which can be directly on another element or can have a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or can have a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0030] Please refer to Figures 1-11 In the embodiments of the present application, the wind turbine blade strength detection device comprises a test cabinet 1, further comprising: Two bottom plates 3 symmetrically movably arranged in the test cabinet 1, a set of movable mechanisms are respectively arranged on the two bottom plates 3, and the movable mechanisms are connected with clamping cylinders 9 for clamping the end portions of the blades to be tested; A horizontal moving plate 12 movably arranged in the test cabinet 1, the horizontal moving plate 12 is provided with a swing plate 18, the swing plate 18 is provided with a chuck 22 for clamping the detection points between the two ends of the blade to be tested, the swing plate 18 can be driven by a power mechanism arranged on the horizontal moving plate 12, so that the chuck 22 drives the blade to swing, and the horizontal moving plate 12 can be driven by a screw driving mechanism arranged in the test cabinet 1 to move along the length direction of the blade, so that the chuck 22 clamps the detection points between the two ends of the blade one by one; A detector 24 movably arranged on the horizontal moving plate 12, the horizontal moving plate 12 is further provided with a transposition mechanism, the transposition mechanism can drive the chuck 22 to separate from the blade, and promote the probe 25 of the detector 24 to move above the blade, so as to detect the detection points of the blade.

[0031] It should be noted that the detection of the detector 24 on the blade can adopt ultrasonic principle, specifically, when the probe 25 reaches above the detection point of the blade, air coupling ultrasonic technology or electromagnetic ultrasonic technology is used to adopt non-contact detection, when ultrasonic wave passes through the material, if the blade has defects, a boundary will be formed between the defects and the blade, because the acoustic impedance on both sides of the boundary is different, ultrasonic wave will be reflected, by analyzing the frequency, amplitude, standing wave, wavelength and transmission time of the ultrasonic signal, etc., the damage information of the blade can be obtained; Secondly, the threaded drive mechanism includes a lead screw fixed inside the test cabinet 1 and a guide rod fixed inside the test cabinet 1. A threaded sleeve and a guide sleeve are respectively fitted on the lead screw and the guide rod. The threaded sleeve is threadedly connected to the lead screw, and the guide sleeve is slidably connected to the guide rod. Both the threaded sleeve and the guide sleeve are fixed to the transverse plate 12. The test cabinet 1 is also equipped with a servo motor for driving the lead screw to rotate in the forward or reverse direction. Therefore, by utilizing the high precision and stability of the threaded engagement, the stability of the position switching process of the chuck 22 can be effectively improved, enabling the chuck 22 to switch accurately between multiple detection points.

[0032] Specifically, during strength testing, two opposing clamping cylinders 9 in the test cabinet 1 clamp the two ends of the blade to be tested, keeping the blade in a horizontal state, which allows multiple test points to be set along the length of the blade. Subsequently, the chuck 22 clamps the detection point, and the power mechanism operates, driving the swing plate 18 to reciprocate the blade through the chuck 22. Therefore, during the swing, the edge of the blade clamped by the chuck 22 (i.e., the detection point) is subjected to force. After a certain number of swings, the blade returns to its initial horizontal state, and the chuck 22 releases its clamping state on the blade. The shifting mechanism operates, driving the chuck 22 to move away from the blade. At the same time, the probe 25 of the detector 24 moves above the detection point to perform flaw detection on the detection point, thereby reflecting the strength of the blade. Subsequently, the threaded drive mechanism drives the transverse plate 12 to move along the length direction of the blade, and the chuck 22 clamps multiple detection points on the blade one by one, realizing comprehensive detection of the blade.

[0033] It should be noted that, for ease of comparison, multiple detection points on the blade can be tested before the blade begins to swing, so as to provide comparative data.

[0034] By setting two opposing movable mechanisms, during testing, the two opposing movable mechanisms can be connected to both ends of the blade respectively. The clamp 22 clamps multiple different detection points along the blade's length direction. Therefore, each time a different detection point is clamped, the blade's rotation center changes accordingly, just like the fulcrum of a lever is constantly changing. By detecting each fulcrum position, the strength and integrity of the blade at different fulcrum positions are fully tested, avoiding detection blind spots caused by fixed fulcrum detection. By observing the swing of the blade at the pivot point and the subsequent ultrasonic testing results, we can more accurately analyze the impact of the complex stresses borne by different parts of the blade on its strength during actual operation. This helps to detect local minor defects such as cracks and delamination at an early stage, so that timely measures can be taken to repair or replace them, ensuring the safe operation of the wind turbine. The wind turbine blade is subjected to the changing wind force in actual operation, and the stress state thereof is complex and changeable. The effective stress and stress condition of different parts are quite different. By simulating the swinging condition of the multi-pivot, the multi-directional swinging coordination of the blade is realized, so that the stress state and swinging condition of the blade in actual operation can be simulated more truly. Compared with the traditional fixed-pivot detection, the multi-pivot detection mode can more accurately reflect the complex load borne by the blade in the actual use environment, provide more reliable data support for the strength evaluation of the blade, and help to optimize the design and manufacturing process of the blade.

[0035] Please refer to Figure 8 , Figure 9 and Figure 10 again, the power mechanism comprises a rotating shaft 19 rotatably installed on the transverse plate 12 and a sleeve shaft 20 slidably sleeved with the rotating shaft 19, and a transmission structure is arranged between the sleeve shaft 20 and the rotating shaft 19; The sleeve shaft 20 is fixed with the swinging plate 18 and connected with the transposition mechanism, and the side of the transverse plate 12 is further provided with a driving motor 17, and the rotating shaft 19 is connected with the output end of the driving motor 17. The transmission structure comprises two strip-shaped protrusions 1901 formed on the outer wall of the rotating shaft 19 and two strip-shaped grooves 2001 arranged on the inner wall of the sleeve shaft 20, the strip-shaped grooves 2001 are matched with the strip-shaped protrusions 1901, and the two are parallel to the central axes of the rotating shaft 19 and the sleeve shaft 20.

[0036] In detail, in operation, the driving motor 17 drives the rotating shaft 19 to reciprocatingly rotate, and then the rotating shaft 19 can drive the sleeve shaft 20 to reciprocatingly rotate synchronously through the strip-shaped protrusions 1901 and the strip-shaped grooves 2001, so that the swinging plate 18 can drive the blade to reciprocatingly swing through the chuck 22. In specific implementation, the rotating speed of the driving motor 17 can be adjusted to change the swinging speed of the blade, and in addition, the test can be diversified by changing the rotating period, which can be planned and selected according to actual needs. After a certain frequency of swinging, the blade returns to the horizontal state, and the two sets of movable mechanisms can support the blade, the chuck 22 releases the clamping state of the blade, the transposition mechanism drives the chuck 22 to move away from the blade, and at the same time, the probe 25 can move above the blade to detect the detection point. In order to keep the comprehensiveness of the detection data, the probe 25 can be moved along the length direction of the blade to detect the blade comprehensively after completing the clamping and swinging detection of one detection point.

[0037] Further, in order to ensure the smoothness and accuracy of the probe 25 to the blade, avoid the attenuation of the ultrasonic wave in the propagation medium (such as air) due to the too large distance, therefore, the distance between the probe 25 and the blade detection point cannot be too large during detection, if the probe 25 is directly arranged above the blade, and a large distance is not reserved, then the blade and the swing plate 18 may be damaged when swinging, and the probe 25 is damaged due to the large swing amplitude, for this, the present application sets the transposition mechanism, realizes the position synchronous regulation of the clamp head 22 and the probe 25, under the premise of avoiding the damage of the probe 25 when the blade and the swing plate 18 swing, ensures the smoothness and accuracy of the detection, ensures the efficient transmission of the ultrasonic wave in the propagation medium, and improves the real effectiveness of the detection result.

[0038] Please refer again to Figure 4 、 Figure 7 、 Figure 9 and Figure 10 , the transposition mechanism includes a pneumatic assembly mounted on the transverse plate 12 and connected with the sleeve shaft 20, and a follow-up structure connecting the pneumatic assembly and the detector 24, the pneumatic assembly can drive the swing plate 18 and the detector 24 to move synchronously but in different directions. The pneumatic assembly includes a second air cylinder 16 hinged on the transverse plate 12 and a connecting plate 21 hinged with the moving end of the second air cylinder 16, the connecting plate 21 is rotationally connected with the sleeve shaft 20 and also connected with the follow-up structure.

[0039] The follow-up structure includes a guide plate 13 fixed on the transverse plate 12, the guide plate 13 is arranged in a "U" shape, and a first sliding groove 1301 and a second sliding groove 1302 perpendicular to each other are arranged on the guide plate 13, and a first sliding block 14 and a second sliding block 15 are respectively slidably embedded in the first sliding groove 1301 and the second sliding groove 1302. The first sliding block 14 is fixed with the connecting plate 21, and a first connecting rod 26 is arranged between the first sliding block 14 and the second sliding block 15, and the two ends of the first connecting rod 26 are hinged with the first sliding block 14 and the second sliding block 15 respectively; a sleeve plate 23 is also slidably embedded on the guide plate 13, the detector 24 and the probe 25 are installed on the sleeve plate 23, and a second connecting rod 27 is arranged between the sleeve plate 23 and the second sliding block 15, and the two ends of the second connecting rod 27 are hinged with the sleeve plate 23 and the second sliding block 15 respectively.

[0040] When the blade swings for a certain frequency, the two groups of the movable mechanism support the two ends of the blade respectively, so that the blade remains in a horizontal state. Subsequently, the chuck 22 releases the clamping state of the blade, the movable end of the second cylinder 16 retracts, the sleeve shaft 20 is driven by the connecting plate 21 to slide on the rotating shaft 19 towards the transverse plate 12, correspondingly, the chuck 22 is dislocated from the blade, avoiding the existence of the chuck 22 from blocking the work of the probe 25. At the same time, the connecting plate 21 drives the first sliding block 14 to slide in the first sliding groove 1301 towards the transverse plate 12, and the first sliding block 14 pushes the second sliding block 15 to slide upwards in the second sliding groove 1302 through the first connecting rod 26, and then the second sliding block 15 pushes the sleeve plate 23 to slide away from the transverse plate 12 on the guide plate 13 through the second connecting rod 27, until the probe 25 reaches above the blade, and the detection point of the blade is detected.

[0041] Please refer again to Figure 3 、 Figure 6 and Figure 11 , the test cabinet 1 is provided with a guide groove 2, the bottom plate 3 is slidingly embedded in the guide groove 2, and the movable mechanism includes two vertical arms 4 fixed on the bottom plate 3 and symmetrically arranged. Two sliding grooves are arranged on the vertical arms 4 along the length direction of the vertical arms 4, and movable blocks 5 are slidingly embedded in the sliding grooves. The clamping cylinder 9 is arranged between the two movable blocks 5 through an assembly structure. The assembly structure includes an assembly plate 6 fixedly connected with the two movable blocks 5, an installation plate 8 rotatably arranged on the side of the assembly plate 6 through a shaft pin 7, and the clamping cylinder 9 is fixed on the installation plate 8. The vertical arm 4 is also provided with a supporting piece, the supporting piece includes a limiting block 11 slidingly embedded in the sliding groove and a first cylinder 10 fixed on the side of the vertical arm 4, the movable end of the first cylinder 10 is fixed with the limiting block 11, and the limiting block 11 is located below the movable block 5.

[0042] After the clamping of the blade is completed, before the test starts, the first cylinder 10 drives the limiting block 11 to slide down to the lowest point in the sliding groove, and then the blade swings, the assembly plate 6 drives the movable block 5 to slide up and down in the sliding groove through the clamping cylinder 9 and the installation plate 8, correspondingly, the bottom plate 3 slides back and forth along the guide groove 2; After the swing process ends, the blade returns to its initial horizontal state. Before the chuck 22 is removed, the first cylinder 10 drives the limiting block 11 to rise in the slide until the limiting block 11 abuts against the movable block 5. Thus, the limiting block 11 can play a supporting role, allowing the chuck 22 to be removed. When performing flaw detection, the blade can remain in a horizontal state, which facilitates the probe 25 to accurately detect flaws at the detection points of the blade. In this way, when each detection point is used as a fulcrum, after the swing ends, there is no need for the operator to move the chuck 22. The two sets of movable mechanisms can effectively support the blade, which can effectively ensure the accuracy of the probe 25 in detecting flaws at the detection points.

[0043] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. Wind turbine blade strength testing device, including a testing cabinet; Its features are, Also includes: Two base plates are symmetrically arranged inside the test cabinet. Each base plate is equipped with a set of movable mechanisms, and the movable mechanisms are connected to clamping cylinders for clamping the end of the blade to be tested. The transverse plate is located inside the test cabinet. The transverse plate is equipped with a swing plate. The swing plate is equipped with a chuck for clamping the detection points between the two ends of the blade to be tested. The swing plate can be driven by a power mechanism located on the transverse plate, so that the chuck drives the blade to swing. The transverse plate can also be driven by a threaded drive mechanism located inside the test cabinet to move along the length of the blade, so that the chuck clamps multiple detection points between the two ends of the blade one by one. The detector is mounted on a transverse plate, which is also equipped with a shifting mechanism. The shifting mechanism can drive the chuck to separate from the blade and cause the detector's probe to move above the blade to perform flaw detection on the blade's inspection points.

2. The wind turbine blade strength testing device according to claim 1, characterized in that, The power mechanism includes a rotating shaft rotatably mounted on the transverse plate and a sleeve shaft slidably fitted with the rotating shaft, and a transmission structure is provided between the sleeve shaft and the rotating shaft; The sleeve shaft is fixed to the swing plate and connected to the shifting mechanism. A drive motor is also installed on the side of the transverse plate, and the rotating shaft is connected to the output end of the drive motor.

3. The wind turbine blade strength testing device according to claim 2, characterized in that, The conductive structure includes two strip-shaped protrusions formed on the outer wall of the rotating shaft and two strip-shaped grooves provided on the inner wall of the sleeve shaft. The strip-shaped grooves are adapted to the strip-shaped protrusions, and both are parallel to the central axis of the rotating shaft and the sleeve shaft.

4. The wind turbine blade strength testing device according to claim 2, characterized in that, The switching mechanism includes a pneumatic component mounted on the transverse plate and connected to the sleeve shaft, and a follower structure connecting the pneumatic component and the detector. The pneumatic component can drive the swing plate and the detector to move synchronously but in opposite directions.

5. The wind turbine blade strength testing device according to claim 4, characterized in that, The pneumatic assembly includes a second cylinder hinged to the transverse plate and a connecting plate hinged to the movable end of the second cylinder. The connecting plate is rotatably connected to the sleeve shaft and is also connected to the follower structure.

6. The wind turbine blade strength testing device according to claim 5, characterized in that, The follower structure includes a guide plate fixed to the transverse plate. The guide plate is U-shaped and has a first groove and a second groove perpendicular to each other. A first slider and a second slider are slidably fitted into the first groove and the second groove, respectively.

7. The wind turbine blade strength testing device according to claim 6, characterized in that, The first slider is fixed to the connecting plate, and a first connecting rod is provided between the first slider and the second slider, with the two ends of the first connecting rod respectively hinged to the first slider and the second slider; The guide plate is also slidably fitted with a sleeve plate, the detector and the probe are mounted on the sleeve plate, and a second connecting rod is provided between the sleeve plate and the second slider. The two ends of the second connecting rod are respectively hinged to the sleeve plate and the second slider.

8. The wind turbine blade strength testing device according to claim 1, characterized in that, The test cabinet is provided with a guide groove, the base plate is slidably fitted with the guide groove, and the movable mechanism includes two upright arms fixed to the base plate and symmetrically arranged. Both of the vertical arms are provided with slides along their own length, and movable blocks are slidably fitted in the slides. The clamping cylinder is arranged between the two movable blocks through an assembly structure.

9. The wind turbine blade strength testing device according to claim 8, characterized in that, The assembly structure includes an assembly plate that is fixedly connected to the two movable blocks. A mounting plate is rotatably mounted on the side of the assembly plate via a pivot pin. The clamping cylinder is fixed to the mounting plate.

10. The wind turbine blade strength testing device according to claim 8, characterized in that, The support arm is also provided with a support member, which includes a limiting block that is slidably fitted in the slide rail and a first cylinder fixed to the side of the support arm. The movable end of the first cylinder is fixed to the limiting block, and the limiting block is located below the movable block.

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