A wind turbine blade cover safety fixing device

Abstract

The utility model relates to a kind of wind turbine blade cover plate safety fixing device, including fixed plate and bolt welded and fixed on fixed plate, the fixed plate is located in fan blade, the bolt is sequentially threaded through the manhole around the end of fan blade and the bolt hole corresponding one-to-one on blade cover plate after being fixed by nut, the utility model sequentially threads the bolt in fan blade through the manhole around the end of fan blade and the bolt hole corresponding one-to-one on blade cover plate after being fixed by nut on fixed plate, so that the manhole around the end of fan blade does not need to be embedded bolt also can realize the safety fixation between blade cover plate, can effectively solve the safety fixation problem of blade cover plate after embedded bolt relaxation or drop.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation technology, and in particular to a safety device for fixing the cover plate of wind turbine blades. Background Technology

[0002] In wind turbine blades, the manhole at the blade root primarily facilitates maintenance personnel entering the blade's internal cavity for upkeep. The blade cover plate, on the other hand, seals the manhole, ensuring the internal structure of the blade is protected from external environmental influences and preventing external objects or personnel from falling in and causing safety hazards.

[0003] In most common wind turbine blade covers, the blades are connected and fixed by pre-embedded bolts at the ends of the turbine blades and bolt holes on the blade cover. However, during long-term operation, these pre-embedded bolts are prone to loosening or even falling off due to vibration, fatigue, and other reasons. This can lead to the failure of fixing some or all of the connection points on the blade cover, posing a significant safety hazard. Therefore, it is necessary to re-fix any loose pre-embedded bolts on the blade cover. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a safety fixing device for the blade cover plate of a wind turbine generator set, which can effectively solve the problem of safe fixing of the blade cover plate after the pre-embedded bolts loosen or fall off.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A safety fixing device for a wind turbine blade cover plate includes a fixing plate and bolts welded and fixed to the fixing plate. The fixing plate is fixed inside the wind turbine blade. The bolts pass through the bolt holes around the manhole at the end of the wind turbine blade and correspond one-to-one with the bolt holes on the blade cover plate, and are then fixed by nuts.

[0006] The beneficial effects of this utility model are as follows: the bolts on the fixing plate pass through the manholes around the ends of the fan blades and the corresponding bolt holes on the blade cover plate, and are then fixed by nuts. This ensures that even if the pre-embedded bolts around the manholes at the ends of the fan blades loosen or fall off, they can still be securely fixed to the blade cover plate. This effectively avoids the safety hazard of the blade cover plate falling off due to insufficient connection strength caused by the loosening or falling off of the pre-embedded bolts, which could lead to accidental detachment of the blade cover plate under extreme working conditions. At the same time, by directly welding the bolts to the fixing plate, the fit between the fixing plate and the periphery of the manhole can also achieve a uniform distribution of force on the ends of the fan blades, further improving the reliability of the connection. Moreover, the entire device has a simple structure, is easy to process, and is convenient to carry and install.

[0007] Furthermore, the fixing plate is fixedly connected to the end of the fan blade on one side inside the fan blade.

[0008] The beneficial effects of adopting the above-mentioned further solution are: the fixing plate and the inner surface of the end of the wind turbine blade can be fixed by bonding with high-strength structural adhesive, so as to be tightly connected with the end of the wind turbine blade into one body, ensuring that there will be no relative displacement between the fixing plate and the bolt and the end of the wind turbine blade after connection, thereby ensuring the stability of the blade cover plate in long-term operation. Moreover, the combination of bonding and mechanical connection can further improve the reliability of the overall structure.

[0009] Furthermore, when disassembling the blade cover, only the nut needs to be removed to take it off, reducing the risk of damage to the wind turbine blade structure during maintenance. At the same time, since the fixing plate is bonded to the inner surface of the blade tip with high-strength structural adhesive, the fixing plate remains firmly attached to the inner side of the blade after the nut is removed, facilitating subsequent reinstallation or disassembly of the blade cover and effectively improving maintenance efficiency. Meanwhile, under extreme load conditions, even if the bolts bear some shear force, the bonding structure between the fixing plate and the inner wall of the wind turbine blade can still effectively share the load, preventing fatigue failure caused by local stress concentration, further improving the durability and safety of the connection system, and ensuring reliable fixation of the blade cover under long-term alternating loads and harsh environments.

[0010] Furthermore, the fixing plate is arc-shaped.

[0011] The beneficial effects of adopting the above-mentioned further solution are: the fixed plate is set to be arc-shaped so that it can match the curvature of the manhole at the end of the fan blade, so that it can not only cover the bolt holes around the manhole, but also will not obstruct the manhole, ensuring normal passage and maintenance operations of the manhole. In addition, the fixed plate with arc structure has a larger contact area and more uniform force distribution, which further improves the stability of the connection and the overall structural strength.

[0012] Furthermore, the number of bolts on the fixing plate is at least two, preferably two.

[0013] The beneficial effects of adopting the above-mentioned further solution are: the two bolts are fixed from two different positions to form a relative tightening force, which further enhances the symmetry and balance of the connection, effectively avoids the phenomenon of eccentric load caused by single-point force, improves the torsional and shear resistance of the overall structure, and facilitates the application of uniform preload during assembly to ensure a tight fit between the blade cover plate and the fixed plate, further ensuring the reliability of the connection under vibration and alternating load conditions.

[0014] Furthermore, the symmetrical arrangement of the two bolts reduces the additional bending moment caused by assembly errors, minimizes the risk of stress concentration, and improves the fatigue life of the connection structure. Simultaneously, the bolt hole positions are precisely calculated and machined to ensure accurate alignment with the bolt holes on the wind turbine blade ends and blade cover plates, preventing misalignment and further improving assembly efficiency and reliability. During long-term operation, these bolts effectively resist the centrifugal force and aerodynamic loads generated by blade rotation, maintaining the cover plate's stability and preventing loosening or displacement, thus ensuring safe equipment operation.

[0015] Furthermore, the number of fixing plates is one or more, and when there are multiple fixing plates, each fixing plate 1 is circumferentially distributed at equal intervals.

[0016] The beneficial effects of adopting the above-mentioned further solutions are: multiple fixing plates can effectively avoid deformation or stress concentration caused by uneven force on one side, while enhancing the stability and vibration resistance of the blade cover plate under complex working conditions, ensuring uniform stress on the structure around the manhole, and reducing the risk of fatigue cracking.

[0017] Furthermore, there are two fixing plates, which are symmetrically installed on both sides of the concentric circle of the manhole.

[0018] The beneficial effects of adopting the above-mentioned further scheme are: the two fixed plates are symmetrically arranged on opposite sides of the manhole to form a symmetrical support structure, which can further enable the load to be evenly distributed around the manhole, resist the multi-directional torque caused by the rotation of the wind turbine blades, wind load and vibration, thereby significantly improving the static and dynamic stability of the structure.

[0019] Furthermore, the fixing plate is made of stainless steel.

[0020] The beneficial effects of adopting the above-mentioned further solutions are: stainless steel plates have excellent corrosion resistance and high strength characteristics, and can maintain good mechanical properties and connection reliability for a long time in harsh outdoor environments and high and low temperature environments. They can effectively resist moisture and ultraviolet aging corrosion, extend the service life of the structure, and reduce the frequency of maintenance.

[0021] Furthermore, the thickness of the fixing plate is 1~3mm.

[0022] The beneficial effects of adopting the above-mentioned further solutions are: a thickness of 1-3mm can effectively resist bending deformation caused by external loads, while ensuring sufficient stiffness and strength, avoiding structural instability due to excessive thinness or stress concentration caused by excessive thickness. This thickness range, verified through simulation analysis and field measurements, achieves lightweight design while meeting load-bearing requirements, helping to reduce the overall weight of the wind turbine blades, improve wind turbine operating efficiency, and ensure good connection performance and structural integrity under long-term alternating loads. Furthermore, this thickness design also considers the adaptability to minor deformations during installation, helping to maintain the sealing and stability of the connection interface under complex climatic conditions, ensuring the overall service life of the blades.

[0023] Furthermore, both the bolts and nuts have an anti-corrosion coating on their outer surfaces.

[0024] The beneficial effects of adopting the above-mentioned further solutions are as follows: the anti-corrosion coating can reduce the corrosion rate of fasteners and extend their service life, especially in outdoor environments where they are subjected to long-term wind, sand, rain, snow, and ultraviolet radiation. It effectively prevents oxidation and interlayer corrosion on the surface of metal components, maintains the stability of the fixing plate and bolt connection area, and reduces maintenance frequency and replacement costs. Simultaneously, the anti-corrosion coating, combined with the weather-resistant properties of the acrylic fixing plate, forms a dual protection system, further enhancing the adaptability of the entire device under harsh operating conditions, ensuring the continuous and stable operation of the power generator set, and improving overall power generation reliability and life-cycle economic efficiency. Attached Figure Description

[0025] Figure 1 This is a top view of the installation of a wind turbine blade cover safety fixing device according to this utility model.

[0026] Figure 2 This is a cross-sectional structural diagram of the safety fixing device for the blade cover of a wind turbine generator set during installation.

[0027] The attached diagram lists the components represented by each number as follows: 1. Fixing plate; 2. Bolt; 3. Manhole; 4. Blade cover plate; 5. Nut; 6. Fan blade tip. Detailed Implementation

[0028] The principles and features of this utility model are described below. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0029] Example 1 like Figure 1 and Figure 2As shown, this embodiment provides a safety fixing device for a wind turbine blade cover plate, including a fixing plate 1 and bolts 2 welded and fixed on the fixing plate 1. The fixing plate 1 is fixed inside the wind turbine blade, and the bolts 2 pass through the bolt holes around the manhole 3 at the end of the wind turbine blade 6 and correspond one-to-one with the bolt holes on the blade cover plate 4, and are then fixed by nuts 5.

[0030] In this embodiment, the bolts 2 on the fixing plate 1 pass through the manhole 3 around the fan blade end 6 and the corresponding bolt holes on the blade cover plate 4, and are then fixed by nuts 5. This ensures that even if the pre-embedded bolts around the manhole 3 around the fan blade end 6 loosen or fall off, they can still be securely fixed to the blade cover plate 4. This effectively avoids the safety hazard of the blade cover plate 4 falling off due to insufficient connection strength caused by the loosening or falling off of the pre-embedded bolts, which could lead to accidental detachment of the blade cover plate 4 under extreme working conditions. At the same time, by directly welding the bolts 2 to the fixing plate 1, the fit between the fixing plate 1 and the periphery of the manhole 3 can also achieve a uniform distribution of force on the fan blade end 6, further improving the connection reliability. Moreover, the entire device has a simple structure, is easy to process, and is convenient to carry and install.

[0031] Example 2 like Figure 2 As shown, based on Embodiment 1, in this embodiment, the fixing plate 1 is fixedly connected to the end 6 of the fan blade on one side inside the fan blade.

[0032] In this embodiment, the fixing plate 1 and the inner surface of the end of the fan blade 6 can be fixed by bonding with high-strength structural adhesive, so that they are tightly connected to the end of the fan blade 6 and form a whole. This ensures that there will be no relative displacement between the fixing plate 1 and the bolt 2 and the end of the fan blade 6 after connection, thereby ensuring the stability of the blade cover plate 4 during long-term operation. Moreover, the combination of bonding and mechanical connection can further improve the reliability of the overall structure.

[0033] Furthermore, when disassembling the blade cover plate 4, only the nut 5 needs to be removed to take off the blade cover plate 4, which reduces the risk of damage to the wind turbine blade structure during maintenance. At the same time, since the fixing plate 1 is bonded to the inner surface of the blade end with high-strength structural adhesive, the fixing plate 1 remains firmly attached to the inner side of the blade after the nut 5 is removed, which facilitates the subsequent reinstallation or disassembly of the blade cover plate 4 and effectively improves maintenance efficiency. Meanwhile, under extreme load conditions, even if the bolt 2 bears some shear force, the bonding structure between the fixing plate 1 and the inner wall of the wind turbine blade can still effectively share the load, prevent fatigue failure caused by local stress concentration, further improve the durability and safety of the connection system, and ensure the reliable fixation of the blade cover plate 4 under long-term alternating loads and harsh environments.

[0034] Example 3 like Figure 1As shown, based on Embodiment 1, the fixing plate 1 in this embodiment is arc-shaped.

[0035] In this embodiment, the fixing plate 1 is set to be arc-shaped so that it can match the curvature of the manhole 3 at the end of the fan blade 6. This not only covers the bolt holes around the manhole 3, but also does not obstruct the manhole 3, ensuring normal passage and maintenance operations of the manhole 3. In addition, the arc-shaped fixing plate 1 has a larger contact area and more uniform force distribution, further improving the stability of the connection and the overall structural strength.

[0036] Example 4 Based on Embodiment 3, in this embodiment, the number of bolts 2 on the fixing plate 1 is at least two, such as... Figure 1 As shown, two are preferred.

[0037] In this embodiment, the two bolts 2 are fixed from two different positions to form a relative tightening force, which further enhances the symmetry and balance of the connection, effectively avoids the off-center load phenomenon caused by single-point force, improves the torsional and shear resistance of the overall structure, and facilitates the application of uniform preload during assembly to ensure a tight fit between the blade cover plate 4 and the fixing plate 1, further ensuring the reliability of the connection under vibration and alternating load conditions.

[0038] Furthermore, the symmetrical arrangement of the two bolts 2 can reduce the additional bending moment caused by assembly errors, reduce the risk of stress concentration, and improve the fatigue life of the connection structure. At the same time, the bolt hole positions are precisely calculated and machined to ensure accurate matching with the bolt holes on the wind turbine blade tip 6 and the blade cover plate 4, avoiding misalignment installation, further improving assembly efficiency and reliability. In long-term operation, it can also effectively resist the centrifugal force and aerodynamic load generated by blade rotation, keep the cover plate stable and fixed, prevent loosening or displacement, and ensure the safe operation of the equipment.

[0039] Example 5 like Figure 1 As shown, based on embodiment 4, the number of fixing plates 1 in this embodiment can be one or more. When there are multiple fixing plates 1, they are circumferentially distributed at equal intervals.

[0040] In this embodiment, multiple fixing plates 1 can effectively avoid deformation or stress concentration caused by uneven force on one side, while enhancing the stability and vibration resistance of the blade cover plate 4 under complex working conditions, ensuring uniform force on the surrounding structure of the manhole 3, and reducing the risk of fatigue cracking.

[0041] Example 6 like Figure 1 As shown, based on embodiment 5, there are two fixing plates 1 in this embodiment, and the two fixing plates 1 are symmetrically installed on both sides of the concentric circle of the manhole 3.

[0042] In this embodiment, two fixed plates 1 are symmetrically arranged on opposite sides of the manhole 3 to form a symmetrical support structure, which can further enable the load to be evenly distributed around the manhole 3, resist the multi-directional torque caused by the rotation of the wind turbine blades, wind load and vibration, thereby significantly improving the static and dynamic stability of the structure.

[0043] Example 7 like Figure 1 As shown, based on Embodiment 1, the fixing plate 1 in this embodiment is made of stainless steel.

[0044] In this embodiment, the fixing plate 1 is made of stainless steel. Stainless steel has excellent corrosion resistance and high strength, and can maintain good mechanical properties and connection reliability in harsh outdoor environments and high and low temperature environments for a long time. It can effectively resist moisture and ultraviolet aging corrosion, extend the service life of the structure, and reduce the frequency of maintenance.

[0045] Example 8 like Figure 1 As shown, based on Example 1, the thickness of the fixing plate in this example is 1~3mm.

[0046] In this embodiment, the fixing plate 1 is set to a thickness of 1~3mm, which can effectively resist bending deformation caused by external loads, while ensuring sufficient rigidity and strength, avoiding structural instability due to excessive thinness or stress concentration caused by excessive thickness. This thickness range has been verified by simulation analysis and actual measurement. It achieves lightweight design while meeting load requirements, which helps to reduce the overall weight of the wind turbine blades, improve the operating efficiency of the wind turbine, and ensure good connection performance and structural integrity under long-term alternating loads. In addition, this thickness design also takes into account the adaptability to small deformations during installation, which helps to maintain the sealing and stability of the connection interface under complex climatic conditions and ensure the overall service life of the blades.

[0047] Example 9 like Figure 1 As shown, based on Embodiment 1, the outer surfaces of both the bolt 2 and the nut 5 in this embodiment are provided with an anti-corrosion coating.

[0048] In this embodiment, the anti-corrosion coating can reduce the corrosion rate of fasteners and extend their service life. Especially in outdoor environments where they are subjected to long-term wind, sand, rain, snow, and ultraviolet radiation, it effectively prevents oxidation and interlayer corrosion on the surface of metal parts, maintains the stability of the connection area between the fixing plate 1 and the bolt 2, and reduces maintenance frequency and replacement costs. At the same time, the anti-corrosion coating, combined with the weather-resistant properties of the acrylic fixing plate 1, forms a dual protection system, further enhancing the adaptability of the entire device under harsh working conditions, ensuring the continuous and stable operation of the power generator set, and improving the overall power generation reliability and life-cycle economy.

[0049] The working principle of this utility model is as follows: When some or all of the pre-embedded bolts connecting the end of the fan blade 6 to the blade cover plate 4 are damaged, the bolts 2 on the fixing plate 1 pass through the manhole around the end of the fan blade 6 and the corresponding bolt holes on the blade cover plate 4 one by one through the manhole around the end of the fan blade 6. Then, the bolts are fixed by the nuts 5. This allows the end of the fan blade 6 to be securely fixed to the blade cover plate 4 without the need for pre-embedded bolts. This effectively avoids the safety hazards caused by insufficient connection strength due to loosening or falling off of the pre-embedded bolts, which could lead to the blade cover plate 4 falling off. At the same time, by directly welding the bolts 2 to the fixing plate 1, the fit between the fixing plate 1 and the periphery of the manhole can also achieve a uniform distribution of force on the end of the fan blade 6, further improving the reliability of the connection. Moreover, the entire device has a simple structure and is easy to process.

[0050] The fixing plate 1 can be bonded to the inner surface of the end of the fan blade 6 with high-strength structural adhesive, thus forming a tight connection between the fixing plate 1 and the end of the fan blade 6. This ensures that there will be no relative displacement between the fixing plate 1 and the bolt 2 and the end of the fan blade 6 after the connection, thereby ensuring the stability of the blade cover plate 4 during long-term operation. Moreover, the combination of adhesive bonding and mechanical connection can further improve the reliability of the overall structure.

[0051] Furthermore, when disassembling the blade cover plate 4, only the nut 5 needs to be removed to take off the blade cover plate 4, which reduces the risk of damage to the wind turbine blade structure during maintenance. At the same time, since the fixing plate 1 is bonded to the inner surface of the blade end with high-strength structural adhesive, the fixing plate 1 remains firmly attached to the inner side of the blade after the nut 5 is removed, which facilitates the subsequent reinstallation or disassembly of the blade cover plate 4 and effectively improves maintenance efficiency. Meanwhile, under extreme load conditions, even if the bolt 2 bears some shear force, the bonding structure between the fixing plate 1 and the inner wall of the wind turbine blade can still effectively share the load, prevent fatigue failure caused by local stress concentration, further improve the durability and safety of the connection system, and ensure the reliable fixation of the blade cover plate 4 under long-term alternating loads and harsh environments.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A safety fixing device for the blade cover plate of a wind turbine generator set, characterized in that, It includes a fixing plate (1) and bolts (2) welded and fixed on the fixing plate (1). The fixing plate (1) is fixed inside the fan blade. The bolts (2) pass through the manhole (3) at the end of the fan blade (6) and the bolt holes on the blade cover plate (4) corresponding to each other, and are then fixed by nuts (5).

2. The wind turbine blade cover plate safety fixing device according to claim 1, characterized in that, The fixing plate (1) is fixedly connected to the end of the fan blade (6) on one side inside the fan blade.

3. The wind turbine blade cover plate safety fixing device according to claim 1, characterized in that, The fixing plate (1) is arc-shaped.

4. The wind turbine blade cover plate safety fixing device according to claim 3, characterized in that, The number of bolts (2) on the fixing plate (1) is at least two.

5. The wind turbine blade cover plate safety fixing device according to claim 4, characterized in that, The number of the fixing plates (1) is one or more.

6. The wind turbine blade cover plate safety fixing device according to claim 5, characterized in that, There are two fixing plates (1), which are symmetrically installed on both sides of the concentric circle of the manhole (3).

7. The wind turbine blade cover plate safety fixing device according to claim 1, characterized in that, The fixing plate (1) is a stainless steel plate.

8. The wind turbine blade cover plate safety fixing device according to claim 7, characterized in that, The thickness of the fixing plate (1) is 1~3mm.

9. The wind turbine blade cover plate safety fixing device according to claim 1, characterized in that, The outer surfaces of the bolts (2) and nuts (5) are both coated with anti-corrosion coatings.

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