Bending-torsion coupling loading experiment blade clamping mechanism and wind power blade

Abstract

The invention discloses a bending-torsion coupling loading experiment blade clamping mechanism and a wind power blade, and the mechanism comprises two shells which are movably connected with each other and can be close to or far away from each other; the pushing main bodies are arranged on the two shells, the pushing main bodies axially coincide, and the pushing ends of the pushing main bodies extend to the inner sides of the shells; the buffer gasket is fixedly arranged at the pushing end, and a pressure detection unit is connected to the buffer gasket; and the clamping block is arranged at the bottom of the pressure detection unit and abuts against the blade. Blades in various shapes can be easily clamped by adjusting the distance between the two shells, so that the universality and the utilization rate of the clamping mechanism are improved; the arrangement of the pushing main body can ensure that the clamping force of each part of the blade is kept consistent and the experiment precision is improved, and the cooperative operation of the pressure detection unit, the buffer gasket and the clamping blocks can monitor the contact state of each clamping block in real time, and the pushing force is buffered, so that the blade is protected, the accurate simulation of the experiment is realized, and the experiment efficiency is improved. And the experiment cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of wind turbine blade testing technology, specifically relating to a blade clamping mechanism for bending-torsional coupling loading test and a wind turbine blade. Background Technology

[0002] Bending-torsion coupled loading is a common complex stress form for blades in actual operation. Under many actual conditions, blades are not only subjected to bending loads, but also torsional loads. These two loads are coupled and act together on the blade, significantly affecting its structural strength, fatigue life and other properties.

[0003] Existing blade clamping mechanisms mostly suffer from uneven clamping force distribution and poor adaptability. The arc plates of the clamps cannot adapt to blades of different diameters or complex curved surfaces, resulting in local pressure concentration or poor fit during clamping, affecting experimental accuracy. In addition, existing blade clamping mechanisms are difficult to monitor the contact state of each arc plate in real time when clamping blades, and lack dynamic adjustment mechanisms, which can easily cause deviations in clamping data, leading to large experimental data errors and easy blade damage. It is difficult to achieve accurate simulation of blade bending-torsional coupling loading. At the same time, the lack of an effective buffering mechanism means that when the loading force is too large, it cannot effectively protect the blade, which can easily cause blade damage and increase experimental costs and risks. Summary of the Invention

[0004] The purpose of this invention is to provide a blade clamping mechanism and wind turbine blade for a bending-torsional coupling loading test, in order to solve the technical defects in the prior art where the blade clamping device cannot adapt to the curved surface of the blade, resulting in poor clamping, difficulty in real-time monitoring of the contact state of each arc plate, and inability to protect the blade.

[0005] To achieve the above objectives, the present invention employs the following technical solution: Firstly, a blade clamping mechanism for bending-torsional coupling loading experiments is provided, comprising: The two shells are movably connected to each other and can move closer or further apart; A pushing body is disposed on the two housings, the pushing bodies are axially overlapped, and its pushing end extends to the inside of the housing; A buffer pad is fixed to the pushing end, and a pressure detection unit is connected thereon; A clamping block is located at the bottom of the pressure detection unit and abuts against the blade.

[0006] Furthermore, the number of actuating bodies is the same on both shells; On a single shell, the included angle between two adjacent propulsion bodies is an acute angle; Each of the two housings is equipped with a data acquisition module and a controller, and the controller is electrically connected to the data acquisition module, the propulsion body, and the pressure detection unit.

[0007] Furthermore, both housings are hollow structures, and the data acquisition module is disposed within the hollow structure.

[0008] Furthermore, multiple mounting holes are provided on the two housings, and the multiple mounting holes are arranged at intervals along the outer side of the housings, with a pushing body provided in each of the mounting holes.

[0009] Furthermore, both shells are semi-circular structures, and the two ends of the two shells are connected by hinges or springs.

[0010] Furthermore, the buffer pad is made of polyurethane material and is bonded to the bottom of the push end with epoxy resin adhesive.

[0011] Furthermore, the clamping block has a U-shaped structure, with its open end facing the blade and its sealing end fixedly connected to the bottom of the pressure detection unit.

[0012] Furthermore, the pressure detection unit is a pressure sensor.

[0013] Furthermore, the actuating body is an electric actuator or a direct motor.

[0014] Secondly, a wind turbine blade is provided, wherein the blade body is clamped by the bending-torsional coupling loading test blade clamping mechanism described above.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By adjusting the distance between the two housings, blades of various shapes can be easily clamped, improving the versatility and utilization of the clamping mechanism; the setting of the main body can ensure that the clamping force of each part of the blade is consistent, improving the experimental accuracy; while the coordinated operation of the pressure detection unit, buffer pad and clamping block can monitor the contact status of each clamping block in real time and buffer the driving force, thereby protecting the blade, realizing accurate simulation of the experiment and reducing the experimental cost.

[0016] 2. The number of driving bodies on both shells is the same, which ensures that the force on each part of the blade being clamped is more uniform, avoiding local stress concentration caused by uneven force. The controller precisely controls the driving body based on the information fed back by the data acquisition module, coordinating the movement of the driving bodies on the two shells, so that the blade is subjected to precise bending and torsional coupling load, improving the accuracy and repeatability of the experiment.

[0017] 3. The hollow structure can isolate the data acquisition module from external environmental interference to a certain extent, reduce the impact of electromagnetic interference on data transmission and acquisition, and improve data quality.

[0018] 4. The point-to-point installation method enables a tight and stable connection between the main body and the housing.

[0019] 5. The symmetry of the semi-circular structure allows the force to be transmitted more evenly to all parts of the blade when the load is applied to the blade by pushing the main body.

[0020] 6. When the driving end applies force to the blade, the buffer pad can absorb some of the impact energy through its own elastic deformation, reducing the direct impact force on the blade and thus reducing the risk of the blade being damaged by instantaneous impact.

[0021] 7. When the open end of the U-shaped clamping block faces the blade, it can form a surrounding clamping effect on the blade, so that the clamping force can be more evenly distributed on the surface of the blade. This avoids stress concentration caused by single-point or unidirectional clamping, reduces the risk of local deformation or damage to the blade during clamping, and thus improves the stability and reliability of clamping. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A three-dimensional schematic diagram of the blade clamping mechanism for bending-torsional coupling loading experiment provided by the present invention; Figure 2 A schematic diagram of the clamping block installation in the blade clamping mechanism for bending-torsional coupling loading test provided by the present invention; Figure 3 A schematic diagram of the pushing body in the blade clamping mechanism for bending-torsional coupling loading experiment provided by the present invention; Figure 4 Side view of the pushing body in the blade clamping mechanism for bending-torsional coupling loading experiment provided by the present invention; Figure 5 A three-dimensional view of the clamping block in the blade clamping mechanism for bending-torsional coupling loading experiment provided by the present invention; The components include: 1. First housing; 2. Second housing; 3. Pushing body; 4. Clamping block; 5. Buffer pad; 6. Pressure detection unit. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0030] To address the technical deficiencies mentioned in the background section, this embodiment provides a blade clamping mechanism for bending-torsional coupling loading experiments and a wind turbine blade. The invention will be further described in detail below with reference to the accompanying drawings: In a first aspect, embodiments of the present invention provide a blade clamping mechanism for a bending-torsional coupling loading test, such as... Figures 1-5 As shown, the clamping mechanism includes two housings, namely a first housing 1 and a second housing 2, which are arranged opposite to each other and are movably connected to each other, allowing them to move closer or further apart; a pushing body 3 is disposed on the first housing 1 and the second housing 2; wherein the pushing bodies 3 located on the first housing 1 and the second housing 2 are axially overlapped, and the pushing end of the pushing body 3 extends to the inner side of the first housing 1 and the second housing 2; a buffer pad 5 is fixed to the bottom of the pushing end, and a pressure detection unit 6 is connected to the buffer pad 5, which is used to detect the pressure of the pushing body 3 acting on the blade surface; a clamping block 4 is disposed at the bottom of the pressure detection unit 6, and when clamping the blade, the clamping block 4 abuts against the blade.

[0031] In the above structure, since the first housing 1 and the second housing 2 are arranged opposite to each other and can move closer or further apart, when clamping blades of different sizes or slightly different shapes, by adjusting the distance between the first housing 1 and the second housing 2, the clamping block 4 can better fit the blade surface, ensuring stable and reliable clamping under various conditions, and improving the versatility and adaptability of the clamping mechanism.

[0032] During the clamping process, the pushing body 3 on the first shell 1 and the second shell 2 can apply force to the blade from different directions, forming a multi-directional synergistic clamping effect, which increases the clamping force, effectively prevents the blade from sliding or deviating during the experiment, and ensures the stability of the clamping.

[0033] Meanwhile, the axial alignment of the pusher bodies 3 located on the first housing 1 and the second housing 2 ensures that the force applied to the blade by the two pusher bodies 3 during the loading process can be transmitted along the same axial direction, avoiding the problem of inaccurate loading caused by the deviation of the force direction. This allows the bending-torsional coupling loading to more accurately simulate the stress state of the blade under actual working conditions and improve the reliability of the experimental results.

[0034] In addition, the buffer pad 5 is fixed at the bottom of the push end. When the push body 3 applies force to the blade, the buffer pad 5 can play a role in buffering and shock absorption, reducing the interference of instantaneous pressure fluctuations caused by impact or vibration on the pressure detection unit 6, so that the pressure detection unit 6 can more accurately detect the stable pressure value of the push body 3 acting on the blade surface, and improve the accuracy of pressure detection.

[0035] like Figure 1As shown, the first housing 1 and the second housing 2 have the same number of pushing bodies 3, which can form a symmetrical mechanical structure when clamping the blade. This makes the force on each part of the blade more uniform when subjected to external forces, avoiding local stress concentration caused by uneven force. For example, in simulating bending-torsional coupling loading, the symmetrical pushing bodies 3 can apply forces from different directions simultaneously, ensuring that the deformation of each part of the blade is coordinated during bending and torsion. This more accurately simulates the stress state of the blade under actual working conditions, improving the reliability and accuracy of the experimental results.

[0036] In practice, the angle formed between two adjacent propulsion bodies 3 on a single first housing 1 or second housing 2 is an acute angle. This allows the propulsion bodies 3 on a single housing to apply force to the blade from multiple different directions, enabling more flexible simulation of complex load conditions experienced by the blade in actual operation. For example, in addition to common bending and torsional loads, oblique impact loads or combined loads can also be simulated, thus providing a more comprehensive test of the blade's performance under different stress conditions and offering richer experimental data for blade design optimization.

[0037] Furthermore, the acute-angled distribution of the propulsion bodies 3 allows for more precise loading control in localized areas. By adjusting the force and direction of action of adjacent propulsion bodies 3, precise loading of specific parts of the blade can be achieved, meeting the experimental requirements for high loading accuracy. For example, when studying the local fatigue performance of a blade, a specific magnitude and direction of load can be applied precisely to a weak point of the blade, allowing for a more accurate assessment of its fatigue life.

[0038] A data acquisition module and a controller are installed on either the first housing 1 or the second housing 2. The controller is electrically connected to the data acquisition module, the propulsion body 3, and the pressure detection unit 6. The data acquisition module can collect the displacement of the propulsion body 3, the magnitude of the applied force, and the pressure data fed back by the pressure detection unit 6 in real time during the experiment. By transmitting this data to the controller in real time, the progress of the experiment and the stress state of the blades can be understood in a timely manner, and the experimental process can be monitored in real time. Once an abnormality is detected, measures can be taken immediately to make adjustments to ensure the safety and smooth progress of the experiment.

[0039] For example, based on the information fed back by the data acquisition module, the controller automatically adjusts the force and direction of the pushing body 3 to achieve automated and precise control of the blade loading process. For instance, when simulating bending-torsional coupling loading, the controller can coordinate the movement of the pushing body 3 on the two shells according to the experimental requirements, so that the blade is subjected to precise bending-torsional coupling load, thereby improving the accuracy and repeatability of the experiment.

[0040] Because the controller automates data acquisition, processing, and control, it reduces manual intervention, improves experimental efficiency, and allows operators to automatically complete the experimental process by simply setting the experimental parameters on the controller and clamping the device, thus shortening the experimental cycle.

[0041] Furthermore, both the first housing 1 and the second housing 2 are hollow structures. The data acquisition module is housed within the hollow structure, while the controller is located outside the first housing 1 and the second housing 2. During the experiment, the hollow structure can isolate the data acquisition module from external environmental interference to a certain extent, preventing dust, moisture, and other impurities from entering the module and avoiding damage or disruption to its normal operation, thereby ensuring the accuracy and stability of data acquisition. At the same time, the hollow structure also provides some shielding, reducing the impact of electromagnetic interference on data transmission and acquisition, and improving data quality.

[0042] Furthermore, during the blade loading experiment, the main body 3 may experience some vibration when it is driven to work. The hollow shell can buffer and absorb some of the vibration energy, so that the data acquisition module is in a relatively stable working environment, ensuring that the acquired data is true and reliable.

[0043] like Figure 1 and Figure 2 As shown, the first housing 1 and the second housing 2 are provided with multiple mounting holes, which are arranged at intervals along the outer side of the housing. A pushing body 3 is set in each mounting hole. Through this point-to-point installation method, a tight and stable connection can be formed between the pushing body 3 and the housing. During the experiment, the pushing body 3 needs to withstand a large reaction force. The independent mounting holes can ensure that the pushing body 3 will not loosen or shift due to the force, thus ensuring the stability and accuracy of the loading process.

[0044] Meanwhile, multiple mounting holes are arranged at intervals along the outer side of the shell, allowing the propulsion body 3 to apply force to the blade from different directions, simulating the complex multi-directional loads experienced by the blade under actual working conditions. This enables a more comprehensive test of the blade's mechanical properties and provides more accurate experimental data for blade design optimization.

[0045] In this embodiment, both the first housing 1 and the second housing 2 are semi-circular structures made of aluminum alloy, and their edges are milled with hinge mounting grooves or spring mounting grooves so that the first housing 1 and the second housing 2 are connected by hinges or springs.

[0046] During the experiment, the semi-circular first shell 1 and second shell 2 can better fit the circular or near-circular outline of the blade, increasing the contact area between the first shell 1 and second shell 2 and the blade and making the distribution more uniform. This allows for a more stable and reliable clamping of the blade, reducing the slippage or displacement of the blade due to uneven force during the experiment, and improving the accuracy and reliability of the experiment.

[0047] When the first housing 1 and the second housing 2 are connected by a hinge or spring, the first housing 1 and the second housing 2 can be adjusted to a certain extent according to the actual size of the blade. Whether the blade is of a smaller diameter or a larger diameter, it can be tightly clamped by adjusting the opening degree of the first housing 1 and the second housing 2, which enhances the versatility and adaptability of the clamping mechanism and reduces the cost of replacing the clamping equipment due to blade size mismatch.

[0048] When installing the blade, simply unfold the first housing 1 and the second housing 2, place the blade in the appropriate position, and then close the first housing 1 and the second housing 2 to complete the clamping. When removing the blade, similarly, simply open the first housing 1 and the second housing 2 to easily remove the blade. Compared with the traditional fixed clamping structure, this significantly improves operational efficiency and reduces the time and labor costs required for loading and unloading blades.

[0049] Furthermore, when the first housing 1 and the second housing 2 are connected by a spring, the spring has a certain elastic deformation capacity, which can play a role in buffering and shock absorption during loading. When the blade is subjected to impact load or the loading force changes abruptly, the spring can absorb some energy, reduce the impact on the blade and clamping mechanism, protect the blade from damage, and at the same time reduce the risk of the clamping mechanism malfunctioning due to excessive force, thus extending the service life of the equipment.

[0050] When the first housing 1 and the second housing 2 are connected by a hinge, the connection stiffness and motion characteristics between the first housing 1 and the second housing 2 can be changed by adjusting the tightness of the hinge, thereby meeting the performance requirements of the clamping mechanism in different experiments.

[0051] like Figure 4 As shown, the buffer pad 5 is made of polyurethane material and is bonded to the bottom of the pushing end of the pushing body 3 with epoxy resin adhesive. The polyurethane material has a unique molecular structure with a large number of micropores inside. These micropores can effectively absorb and disperse energy. When the pushing end applies force to the blade, the buffer pad 5 can absorb part of the impact energy through its own elastic deformation, reducing the direct impact force on the blade, thereby reducing the risk of the blade being damaged by instantaneous impact.

[0052] like Figure 5As shown, the clamping block 4 has a U-shaped structure with its open end facing the blade and its sealing end fixed to the bottom of the pressure detection unit 6. When the open end of the U-shaped clamping block 4 faces the blade, it can form a surrounding clamping on the blade from both sides and the bottom, so that the clamping force can be more evenly distributed on the surface of the blade, avoiding the stress concentration problem caused by single-point or unidirectional clamping, reducing the risk of local deformation or damage to the blade during clamping, thereby improving the stability and reliability of clamping.

[0053] Since the sealing end of the clamping block 4 is fixedly connected to the bottom of the pressure detection unit 6, the clamping force on the blade can be directly transmitted to the pressure detection unit 6 through the clamping block 4. This reduces intermediate links and avoids pressure detection errors caused by energy loss or interference during force transmission. As a result, the pressure detection unit 6 can more accurately measure the actual clamping force on the blade, providing reliable data support for force control and monitoring in experiments or production processes.

[0054] Furthermore, the pressure detection unit 6 is a pressure sensor or a strain gauge pressure sensor, and the driving body 3 is an electric push rod or a direct motor.

[0055] Secondly, a wind turbine blade is provided, wherein the blade body is clamped by the bending-torsional coupling loading test blade clamping mechanism described above.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present invention, they can still make various changes, modifications or equivalent substitutions to the specific implementation of the invention, but these changes, modifications or equivalent substitutions are all within the scope of protection of the pending claims of the invention.

Claims

1. A blade clamping mechanism for a bending-torsional coupling loading experiment, characterized in that, include: The two shells are movably connected to each other and can move closer or further apart; A pushing body is disposed on the two housings, the pushing bodies are axially overlapped, and its pushing end extends to the inside of the housing; A buffer pad is fixed to the pushing end, and a pressure detection unit is connected thereon; A clamping block is located at the bottom of the pressure detection unit and abuts against the blade.

2. The blade clamping mechanism for bending-torsional coupling loading experiment according to claim 1, characterized in that, The number of actuating bodies is the same on both shells; On a single shell, the included angle between two adjacent propulsion bodies is an acute angle; Each of the two housings is equipped with a data acquisition module and a controller, and the controller is electrically connected to the data acquisition module, the propulsion body, and the pressure detection unit.

3. The blade clamping mechanism for bending-torsional coupling loading experiment according to claim 2, characterized in that, Both housings are hollow structures, and the data acquisition module is housed within the hollow structure.

4. The blade clamping mechanism for bending-torsional coupling loading experiment according to claim 2, characterized in that, Multiple mounting holes are provided on the two housings, and the mounting holes are arranged at intervals along the outer side of the housings. A pushing body is provided in each of the mounting holes.

5. The blade clamping mechanism for bending-torsional coupling loading experiment according to claim 4, characterized in that, Both shells are semi-circular in structure, and the two ends of the shells are connected by hinges or springs.

6. The blade clamping mechanism for bending-torsional coupling loading experiment according to claim 1, characterized in that, The buffer pad is made of polyurethane material and is bonded to the bottom of the push end with epoxy resin adhesive.

7. The blade clamping mechanism for bending-torsional coupling loading experiment according to claim 1, characterized in that, The clamping block has a U-shaped structure, with its open end facing the blade and its sealing end fixedly connected to the bottom of the pressure detection unit.

8. The blade clamping mechanism for bending-torsional coupling loading experiment according to claim 1, characterized in that, The pressure detection unit is a pressure sensor.

9. The blade clamping mechanism for bending-torsional coupling loading experiment according to claim 1, characterized in that, The actuating body is an electric actuator or a direct motor.

10. A wind turbine blade, characterized in that, The wind turbine blade body is clamped by the bending-torsional coupling loading test blade clamping mechanism as described in any one of claims 1-9.

Images