Fan blade strain detection device

Abstract

The utility model discloses a fan blade strain detection device which comprises a workbench, a supporting table and a camera, and one side of the upper surface of the supporting table is fixedly connected with a mounting frame. According to the fan blade strain detection device, through the arrangement of the fan blade, the target and the speckles, when the fan blade strain detection device is used, a user performs strain detection on the fan blade, fixes the fan blade on the mounting frame, sprays the speckles on the surface of the fan blade, pastes the target on the fan blade, turns on the camera and sets the standard target as a reference point of a camera system; speckle patterns are shot at different deformation stages of speckles through a camera, the initial state and the deformation state of the fan blade under the stress effect during fatigue inspection are recorded, captured images are analyzed through a digital image correlation (DIC) technology, the speckle patterns before and after deformation are compared, and the system can calculate strain distribution of the surface of the blade. And processing an original DIC result, and calculating displacement and strain to achieve the purpose of fan blade strain inspection.

Description

TECHNICAL FIELD

[0001] The utility model relates to detection equipment technical field, especially a fan blade strain detection device. BACKGROUND

[0002] According to the description of IEC61400-23 and GB25384, for strain measurement of wind power blade static force, fatigue or other test needs, the commonly used method is to paste strain gauges on the key points of the measured blade according to the blade design model, and the strain value in a (or several) direction at the point is obtained by reading the change of grid resistance.

[0003] Since the accurate measurement of strain has high requirements on the installation process of the sensor, the surface of the blade needs to be polished and pretreated, and a series of requirements such as pressing force, curing time and environmental temperature and humidity control are required for pasting and curing, which can greatly affect the measurement results. And the fan blade is a large irregular structural part, and the size of the mainstream blade is getting larger and larger, and the mainstream product has exceeded 100m, so it is difficult to accurately position the measured point matched with the model on the blade, and under high fatigue load, the local strain of the blade is large, which quickly reduces the fatigue life of the strain gauge itself, and also brings difficulties to the continuous and stable reading of the test process data. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a fan blade strain detection device, which can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the technical scheme adopted by the utility model is:

[0006] A fan blade strain detection device, comprising a workbench, a support table and a camera, the upper surface of the support table is fixedly connected with a mounting frame on one side, and the outer surface of the mounting frame is installed with a fan blade on one side.

[0007] In order to adjust the position, as a fan blade strain detection device of the utility model, the upper surface of the workbench is fixedly connected with a support frame on one side, the inner surface of the support frame is rotatably connected with a threaded rod on one side, the support table is threadedly connected with the threaded rod, and the support table is slidably connected with the workbench.

[0008] In order to make the effect of power transmission, as a fan blade strain detection device of the utility model, the output end of the motor is through the outer surface side of the support frame and extends to the inner wall side of the support frame, the output end of the motor is fixedly connected with the threaded rod, the inner surface side of the support frame is fixedly connected with the sliding rod, the support table is slidingly connected with the sliding rod.

[0009] In order to make the purpose of supporting the camera work, as a fan blade strain detection device of the utility model, the lower surface side of the camera is provided with a support frame.

[0010] In order to make the function of setting the reference point, as a fan blade strain detection device of the utility model, the outer surface side of the fan blade is provided with a target.

[0011] In order to make the effect of facilitating calculation, as a fan blade strain detection device of the utility model, the outer surface side of the fan blade is sprayed with a speckle.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] 1. In the utility model, through the setting of the fan blade, the target and the speckle, when using, the user carries out strain inspection to the fan blade, fixes the fan blade on the mounting frame, sprays the speckle on the surface of the fan blade, pastes the target on the fan blade, opens the camera, sets the target as the reference point of the camera system, shoots the speckle pattern through the camera at different deformation stages of the speckle, records the initial state and the deformation state of the fan blade under the stress action during fatigue inspection, uses the digital image correlation DIC technology to analyze the captured image, compares the speckle pattern before and after deformation, the system can calculate the strain distribution on the surface of the blade, processes the original DIC result, calculates the displacement and the strain, and achieves the purpose of strain inspection of the fan blade. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the front view structural schematic diagram of the utility model embodiment;

[0015] Figure 2 It is the fan blade structural schematic diagram of the utility model embodiment;

[0016] Figure 3 It is the support frame structural schematic diagram of the utility model embodiment;

[0017] Figure 4 It is the camera structural schematic diagram of the utility model embodiment;

[0018] Figure 5 It is the speckle structural schematic diagram of the utility model embodiment.

[0019] In the figure: 1. Workbench; 2. Support platform; 3. Camera; 4. Mounting frame; 5. Fan blade; 6. Target; 7. Speckle; 8. Support frame; 9. Threaded rod; 10. Motor; 11. Sliding rod; 12. Support frame. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0021] like Figures 1-5 As shown, a wind turbine blade strain detection device includes a workbench 1, a support platform 2 and a camera 3. A mounting frame 4 is fixedly connected to one side of the upper surface of the support platform 2, and a wind turbine blade 5 is mounted on one side of the outer surface of the mounting frame 4.

[0022] In this embodiment, a target 6 is attached to the outer surface of the fan blade 5 , and a speckle pattern 7 is sprayed on one side of the outer surface of the fan blade 5 .

[0023] During specific use, the user performs a strain inspection on the wind blade 5, fixes the wind blade 5 on the mounting frame 4, sprays the speckle pattern 7 on the surface of the wind blade 5, and simultaneously sticks the target 6 on the surface of the wind blade 5, starts the camera 3, and aligns the camera 3 with the target 6 to set it as the reference point of the camera 3 system. The camera 3 captures high-resolution images of the speckle pattern 7 at different deformation stages of the speckle 7, records the initial state and deformation state of the wind blade 5 under stress during fatigue inspection, and uses digital image correlation (DIC) technology to analyze the captured images. By comparing the speckle pattern 7 before and after deformation, the system can calculate the strain distribution on the blade surface. At the same time, SIFT feature point matching technology is used to overcome the uncertainty caused by large deformation, and the original DIC results are processed to calculate the displacement and strain, thereby completing the strain inspection of the wind blade 5.

[0024] In this embodiment, a support frame 8 is fixedly connected to one side of the upper surface of the workbench 1, a threaded rod 9 is rotatably connected to one side of the inner surface of the support frame 8, the support platform 2 is threadedly connected to the threaded rod 9, the support platform 2 is slidingly connected to the workbench 1, and a motor 10 is fixedly installed on one side of the outer surface of the support frame 8.

[0025] During specific use, the motor 10 is started, and the motor 10 drives the threaded rod 9 to rotate, so that the support platform 2 can automatically slide on the workbench 1, thereby achieving the effect of adjusting the position of the support platform 2.

[0026] In the embodiment, the output end of the motor 10 penetrates through the outer surface side of the support frame 8 and extends to the inner wall side of the support frame 8, the output end of the motor 10 is fixedly connected with the threaded rod 9, the inner surface side of the support frame 8 is fixedly connected with the sliding rod 11, and the support table 2 is slidingly connected with the sliding rod 11.

[0027] In specific use, the motor 10 is started to rotate the threaded rod 9, so as to achieve the purpose of power transmission, and the sliding rod 11 arranged on the support frame 8 can support the sliding effect.

[0028] In the embodiment, the lower surface side of the camera 3 is provided with the support frame 12.

[0029] In specific use, the support frame 12 is fixed on the lower surface of the camera 3, so as to ensure that the camera 3 remains stable during the measurement process, and the installation position of the support frame 12 can provide a proper visual angle, so that the camera 3 can clearly capture the pattern.

[0030] In the embodiment, the outer surface side of the fan blade 5 is provided with the target 6.

[0031] In specific use, the target 6 is set as a reference point to help calibration, and ensure that the image is captured from a consistent visual angle.

[0032] In the embodiment, the outer surface side of the fan blade 5 is sprayed with the speckle 7.

[0033] In specific use, the color and size of the speckle 7 are selected according to the subsequent digital image correlation DIC analysis requirements, so as to ensure that the speckle 7 is clearly visible in the image.

[0034] Working principle: in use, the user carries out the strain check to the fan blade 5, fixes the fan blade 5 on the mounting frame 4, starts the motor 10, the motor 10 is rotated through the drive threaded rod 9, makes the support table 2 can automatically slide on the workbench 1, reaches the effect of adjusting the position of support table 2, fixes the support frame 12 at the lower of camera 3, to ensure that camera 3 keeps stable during the measurement process, ensures that the installation position of support frame 12 can provide appropriate visual angle, so that camera 3 can clearly capture the pattern, the user sprays speckle 7 on the surface of fan blade 5, and pastes target 6 on the surface of fan blade 5, starts camera 3, sets camera 3 as the reference point of camera 3 system by aligning target 6, captures the high-resolution image of speckle 7 pattern by camera 3 to different deformation stages of speckle 7, records the initial state and deformation state of fan blade 5 under the action of stress during fatigue inspection, uses digital image correlation DIC technology to analyze the captured image, compares the speckle 7 pattern before and after deformation, the system can calculate the strain distribution on the surface of blade, and the SIFT feature point matching technology is used to overcome the uncertainty caused by large deformation, the original DIC result is processed, displacement and strain are calculated, the purpose of completing the strain inspection of fan blade 5 is achieved.

[0035] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and the description in the specification are only to illustrate the principle of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A wind turbine blade strain detection device, comprising a workbench (1), a support platform (2) and a camera (3), characterized in that: A mounting frame (4) is fixedly connected to one side of the upper surface of the support platform (2), and a fan blade (5) is mounted on one side of the outer surface of the mounting frame (4); a target (6) is adhered to the outer surface of the fan blade (5), and a speckle (7) is sprayed on one side of the outer surface of the fan blade (5).

2. A fan blade strain detection device according to claim 1, characterized in that: One side of the upper surface of the workbench (1) is fixedly connected to a support frame (8), one side of the inner surface of the support frame (8) is rotatably connected to a threaded rod (9), the support platform (2) and the threaded rod (9) are threadedly connected, the support platform (2) and the workbench (1) are slidably connected, and one side of the outer surface of the support frame (8) is fixedly mounted with a motor (10).

3. The wind turbine blade strain detection device according to claim 2, characterized in that: The output end of the motor (10) passes through one side of the outer surface of the support frame (8) and extends to one side of the inner wall of the support frame (8). The output end of the motor (10) is fixedly connected to the threaded rod (9). A sliding rod (11) is fixedly connected to one side of the inner surface of the support frame (8). The support platform (2) is slidably connected to the sliding rod (11).

4. The wind turbine blade strain detection device according to claim 1, characterized in that: A support frame (12) is provided on one side of the lower surface of the camera (3).

5. The wind turbine blade strain detection device according to claim 1, characterized in that: A target (6) is provided on one side of the outer surface of the fan blade (5).

6. The wind turbine blade strain detection device according to claim 1, characterized in that: One side of the outer surface of the fan blade (5) is sprayed with speckles (7).

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