Wind driven generator hub and internal support machining method thereof

Abstract

The invention is suitable for the technical field of wind driven generators, and provides a wind driven generator hub and an internal support machining method.The wind driven generator hub comprises a top face, side faces and a bottom face, a top face boss is formed at the top of the top face, and a top face through hole is formed in the center of the top face boss; three sets of bearing bosses are formed on the outer wall of the top face boss, reinforcing ribs perpendicular to the bearing bosses are formed on each set of bearing bosses, and reinforcing holes are formed in the bearing bosses in a penetrating mode. The reinforcing ribs are located between every two adjacent sets of bearing bosses and integrally formed with the hub, side grooves are symmetrically formed in the side faces, side face through holes are formed in the side grooves, a first mounting hole and a second mounting hole which are used for being connected with a variable pitch system are formed in the ends of the side faces, a bottom groove is formed in the center of the bottom face, and the side face through holes are formed in the bottom groove. A bottom face through hole is formed in the center of the bottom groove, and lightening holes distributed in a surrounding mode are further formed in the bottom face.

Description

Technical Field

[0001] This invention relates to the field of wind turbine hub technology, and more specifically, to a wind turbine hub and its internal support processing method. Background Technology

[0002] As an important renewable energy power generation device, wind turbines typically include key components such as towers, nacelles, blades, and hubs. The hub, which mounts multiple blades to the end of the main shaft and adjusts the blade angle via a pitch system, is one of the structural components in a wind turbine with the most concentrated load. With the continuous increase in the capacity of single wind turbine units, the size and weight of the hub structure also increase. Its structural layout, installation accuracy, and manufacturing process have a significant impact on the overall operation of the turbine.

[0003] Existing wind turbine hubs are typically manufactured using a monolithic casting process. After casting, the top, sides, and bottom surfaces of the hub require multiple machining operations to create structures such as blade mounting holes, pitch system mounting holes, and internal through holes. Because the hub has a hollow internal structure and numerous, complexly distributed lateral holes, the hub body is susceptible to cutting forces while clamped during the machining of these holes and mounting holes, thus placing high demands on the stability of the machining process.

[0004] To ensure the smooth machining of lateral holes and mounting holes, existing machining methods typically rely on external clamping or multiple flipping and positioning to complete the machining of holes in different directions. This method increases the number of clamping operations and process complexity to some extent, while also placing higher demands on the support conditions of the wheel hub's internal structure.

[0005] Therefore, based on the above problems, this application proposes a method for processing a wind turbine hub and its internal support. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a method for processing wind turbine hubs and their internal supports.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A wind turbine hub includes a top surface, a side surface, and a bottom surface. The top surface has a top surface boss, and a top surface through hole is formed at the center of the top surface boss. Three sets of bearing bosses are formed on the outer wall of the top surface boss. Each set of bearing bosses has a reinforcing rib perpendicular to the bearing boss, and a reinforcing hole is formed through the bearing boss. The reinforcing rib is located between two adjacent sets of bearing bosses and is integrally formed with the hub. The side surface has symmetrically arranged side grooves, and a side surface through hole is provided in the side groove. The end of the side surface has a first mounting hole and a second mounting hole for connecting a pitch system. The bottom surface has a bottom groove at the center, and a bottom surface through hole is formed at the center of the bottom groove. The bottom surface also has weight reduction holes distributed around it.

[0009] The present invention is further configured such that: the bearing boss is configured as a rib-shaped structure with a high middle height and low side heights, the reinforcing hole is opened in the middle position, and the reinforcing rib is arranged adjacent to the reinforcing hole.

[0010] The present invention is further configured such that: an arc groove is formed on the side of the side groove near the top surface, and the second mounting hole is provided at the top position corresponding to the arc groove.

[0011] The present invention is further configured such that: an arc surface is formed between every two sets of the side surfaces, the thickness of the center position of the arc surface is higher than that of the two ends, and the side through holes are opened at corresponding positions on both sides of the arc surface.

[0012] A method for machining an internal support for a wind turbine hub, based on the aforementioned wind turbine hub, includes the following steps:

[0013] S1. Place the wheel hub casting blank on the processing equipment and clamp and position it with the bottom surface facing the processing spindle.

[0014] S2. Machining the bottom surface to form a bottom groove and a bottom through hole located at its center;

[0015] S3. Introduce a radially expandable internal support mechanism into the hub through the bottom through hole, so that the internal support mechanism is tightened inside the hub to form radial support inside the hub.

[0016] S4. With the internal support mechanism in a tightened state, perform lateral hole machining on the side to form a side through hole, a first mounting hole, and a second mounting hole.

[0017] S5. Remove the internal support mechanism and complete the subsequent processing of the wheel hub.

[0018] The present invention is further configured such that: the internal support structure is a multi-point radial support structure, the support points are distributed along the circumference of the hub and are set corresponding to the area where the arc surface is located.

[0019] The present invention is further configured such that: when the multi-point radial support structure is in a tightened state, its supporting force is transmitted along the arc surface to the circumferential and axial directions of the hub, so that the hub maintains the force state defined by the arc surface during the side hole machining process.

[0020] The present invention is further configured such that the side through hole, the first mounting hole, and the second mounting hole are all processed under the condition that the internal support structure is continuously tightened.

[0021] The present invention is further configured such that the processing direction of the side through hole is consistent with the extension direction of the side groove, and is located on both sides of the arc surface.

[0022] The present invention is further configured such that: during the machining of the lateral hole, the internal support structure is always in a radially tightened state, and is released after the machining of the lateral through hole, the first mounting hole, and the second mounting hole is completed.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The wind turbine hub provided by the present invention, by setting a combination structure of bearing boss, reinforcing rib and reinforcing hole on the top surface, and forming an arc surface structure with local thickening characteristics on the side, enables the hub to meet the installation requirements of blade and pitch system, while achieving reasonable load distribution under the overall casting structure. This is beneficial to improving the structural integrity and installation adaptability of the hub under multi-directional stress conditions, and taking into account both load-bearing requirements and structural compactness.

[0025] 2. The wind turbine hub provided in this embodiment, through the combined design of the top boss, reinforcing ribs, and curved reinforcing area, greatly optimizes the overall stress path of the hub, effectively solving the stress concentration problem that easily occurs in high-power unit hubs under extreme wind loads. Simultaneously, through the structural integration of multiple weight-reduction holes, reinforcing holes, and irregularly shaped through holes, the lightweight goal is significantly achieved while ensuring structural rigidity, reducing the load on the top of the unit. Furthermore, the reasonable mounting hole positions and axis layout improve the compatibility accuracy with the pitch system, providing a reliable foundation for the efficient and stable operation of the wind turbine generator set.

[0026] 3. The wind turbine hub internal support processing method provided by the present invention introduces a radially expandable internal support mechanism after completing the bottom through hole processing, and completes the processing of lateral holes and mounting holes in the supported state, so that the hub obtains stable internal support conditions during the lateral processing, which helps to ensure the processing consistency of lateral hole positions and the stability of assembly datum, and is suitable for the multi-station processing needs of large-size cast hubs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a wind turbine hub according to the present invention.

[0028] Figure 2 This is a top view of a wind turbine hub according to the present invention.

[0029] Figure 3 This is a front view of a wind turbine hub according to the present invention.

[0030] Figure 4 This is a bottom view of a wind turbine hub according to the present invention.

[0031] Figure 5 for Figure 1 A magnified view of a portion of region A in the middle.

[0032] Figure 6 This is a schematic diagram of the internal support mechanism in this invention.

[0033] Figure 7 This is a flowchart of a method for processing the internal support of a wind turbine hub according to the present invention.

[0034] Explanation of reference numerals in the attached drawings: 100, hub; 1, top surface; 11, top surface boss; 12, top surface through hole; 13, load-bearing boss; 131, reinforcing rib; 132, reinforcing hole; 2, side surface; 21, side groove; 211, arc groove; 22, side through hole; 23, first mounting hole; 24, second mounting hole; 25, arc surface; 3, bottom surface; 31, bottom groove; 32, flange; 33, bottom through hole; 34, weight reduction hole;

[0035] 400. Internal support mechanism; 41. Support rod; 42. Collar; 43. Rotating rod; 44. Longitudinal plate; 45. Cylinder; 46. Arc plate. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0038] Please see Figure 1-5 The present invention provides the following technical solutions:

[0039] Example 1, please refer to Figure 1-5Specifically, this refers to a wind turbine hub 100, which includes a top surface 1, a side surface 2, and a bottom surface 3. The top surface 1 is located at the upper end of the hub 100, and its top protrudes outward to form a top surface boss 11. A top surface through hole 12 is provided at the center of the top surface boss 11 to provide through-hole conditions for the internal structure of the hub or as a channel structure for subsequent assembly and processing. In this embodiment, the top surface through hole 12 is set as a triangular structure with rounded corners, that is, the apex corners of the triangular outline are rounded to reduce the risk of stress concentration while meeting the structural through-hole requirements.

[0040] Three sets of load-bearing bosses 13 are evenly distributed circumferentially on the outer wall of the top boss 11. Each load-bearing boss 13 is mainly used by the hub 100 to bear the load from the blades and related components during operation. Each set of load-bearing bosses 13 has a reinforcing rib 131, which is set approximately perpendicular to the corresponding load-bearing boss 13. This rib is used to locally strengthen the load-bearing boss 13, thereby improving the structural strength and rigidity of that area. At the same time, a reinforcing hole 132 is provided through each set of load-bearing bosses 13. The reinforcing hole 132 is used to reduce the structural weight while ensuring the load-bearing capacity, and to provide space for internal stress release.

[0041] Furthermore, the reinforcing rib 131 is disposed between two adjacent sets of bearing bosses 13 and is integrally formed with the hub 100, so that the adjacent bearing areas form a continuous mechanical connection structure through the reinforcing rib 131, which is conducive to the distribution and transmission of loads in the hub under complex stress conditions.

[0042] The side surface 2 of the hub 100 is symmetrically provided with side grooves 21 along the circumference. The side grooves 21 are used to form a partial clearance structure on the outer side of the hub to accommodate the installation requirements of related components. A side through hole 22 is provided in the side groove 21, which is used to realize the connection or installation positioning between the hub 100 and the external structure. The end positions of the side surface 2 are respectively provided with a first mounting hole 23 and a second mounting hole 24. The first mounting hole 23 and the second mounting hole 24 are mainly used for assembly connection with corresponding connecting parts in the pitch system.

[0043] In this embodiment, an arc groove 211 is further formed on the side of the side groove 21 near the top surface 1. The arc groove 211 extends in an arc shape along the circumference of the hub. The second mounting hole 24 is correspondingly opened in the top area of ​​the arc groove 211, so that the second mounting hole 24 is structurally closer to the upper area of ​​the hub 100, which facilitates spatial matching with related components in the pitch system.

[0044] In this embodiment, to facilitate the explanation of the assembly relationship between the hub 100 and the pitch system and blades, the relevant axial relationships are explained below.

[0045] Specifically, the hub 100 is used to mount the pitch system and blades of the wind turbine. Each blade in the pitch system is rotatably mounted around a corresponding blade mounting axis. The blade mounting axis is arranged along the radial direction of the hub 100 and corresponds to the area where the corresponding first mounting hole 23 and second mounting hole 24 are located, thereby defining the rotation center of the blade relative to the hub 100.

[0046] The pitch system includes a pitch drive shaft for driving the blades to rotate around the blade mounting axis. The pitch drive shaft is coaxial or parallel to the corresponding blade mounting axis and is driven by a transmission structure within the pitch system. The first mounting hole 23 and the second mounting hole 24 are used to mate with mounting components in the pitch system to position and fix the pitch drive shaft on the hub 100.

[0047] Furthermore, the top through hole 12 and the bottom through hole 33 inside the hub 100 are arranged along the axial direction of the hub, and their center lines together define the internal through hole axis of the hub 100. The internal through hole axis is consistent with the axial direction of the hub 100 and is set at a predetermined angle with the blade mounting axis, thereby structurally distinguishing the axial channel and the radial mounting structure of the hub 100.

[0048] The bottom surface 3 of the wheel hub 100 is located in its lower end region. A bottom groove 31 is formed in the center of the bottom surface 3, which is used to form a partially concave structure at the bottom of the wheel hub. A bottom through hole 33 is opened at the center of the bottom groove 31. The bottom through hole 33 serves as a through channel between the inside and outside of the wheel hub and provides conditions for subsequent processing or assembly. Several weight-reducing holes 34 are also distributed circumferentially on the bottom surface 3. The weight-reducing holes 34 help to reduce the overall weight of the wheel hub 100 without affecting the overall structural strength.

[0049] In the side structure of the wheel hub 100, an arc surface 25 is formed between every two adjacent sets of side surfaces 2. The arc surface 25 is arranged along the circumference of the wheel hub, and its wall thickness at the center position is higher than that at both ends, thus forming an internal reinforcement area in the middle of the arc surface 25. Side through holes 22 are respectively opened at corresponding positions on both sides of the arc surface 25, so that the side through holes 22 avoid the thickest area of ​​the arc surface 25, which helps to maintain a balanced strength distribution of the overall wheel hub structure.

[0050] Based on the aforementioned wind turbine hub structure, this embodiment further provides a method for processing internal supports for the hub 100. This method is mainly used to provide internal support for the hub 100 during lateral hole machining to ensure the stability of the machining process.

[0051] Specifically, the method for processing the internal support of the wind turbine hub includes the following steps.

[0052] First, step 1 is performed, where the cast blank of the hub 100 is placed on the machining equipment for clamping and positioning. In this embodiment, the bottom surface 3 of the hub 100 is clamped with the machining spindle facing it, so that the hub 100 is stably positioned on the machining equipment along its axial direction. Using the bottom surface 3 as the clamping reference facilitates subsequent machining operations around the hub's axial direction.

[0053] Subsequently, step 2 is performed, machining the bottom surface 3 of the hub 100 to form a bottom groove 31 located at the center of the bottom surface 3 and a bottom through hole 33 located at the center of the bottom groove 31. The bottom groove 31 is used to form a partial clearance structure at the bottom of the hub, while the bottom through hole 33 serves as a channel through the interior of the hub, providing conditions for the subsequent introduction of the internal support mechanism. The axis of the bottom through hole 33 is substantially consistent with the axis of the aforementioned top through hole 12, jointly defining the internal through hole axis of the hub 100.

[0054] After completing the bottom surface structure processing, step 3 is performed, where a radially expandable internal support mechanism is introduced into the hub 100 through the bottom through-hole 33. This internal support mechanism gradually expands radially after entering the hub and forms a supporting engagement with the internal structure of the hub 100, thereby establishing a radial support state inside the hub. In this way, the internal space of the hub 100 is effectively supported during subsequent processing.

[0055] In this embodiment, the internal support structure is configured as a multi-point radial support structure, with multiple support points distributed along the circumference of the hub 100 and correspondingly located in the area where the inner arc surface 25 of the hub 100 is situated. Since the wall thickness at the center of the arc surface 25 is relatively large, this area, as an internal support point, facilitates the distribution and transmission of support forces.

[0056] When the multi-point radial support structure is in a tensile state, its supporting force is transmitted along the arc surface 25 to the circumferential and axial directions of the hub 100, so that the hub 100 always maintains the stress state defined by the arc surface 25 during the side hole machining process, thereby maintaining a stable structural shape of the hub 100 during the machining process.

[0057] Next, step 4 is performed, whereby lateral holes are machined on the side surface 2 of the hub 100 while the internal support structure remains taut. Specifically, this includes machining a side through hole 22 within the side groove 21, and a first mounting hole 23 and a second mounting hole 24 located at the end of the side surface 2. The side through hole 22, the first mounting hole 23, and the second mounting hole 24 are all machined while the internal support structure is taut.

[0058] The side through hole 22 is machined in the same direction as the side groove 21, and the side through hole 22 is correspondingly set on both sides of the arc surface 25, so that the side machining avoids the central thick wall area of ​​the arc surface 25, thereby coordinating with the force distribution inside the wheel hub.

[0059] After completing the machining of the lateral holes, proceed to step 5 to release the internal support mechanism, allowing it to retract and exit from the hub 100. Then, complete the remaining machining steps for the hub 100. This completes the machining process of the internal support for the wind turbine hub 100.

[0060] Through the above processing method, the wheel hub 100 is always in an internal support state during the side hole processing stage, and this support state cooperates with the internal arc surface 25 and other structures of the wheel hub, thereby ensuring the smooth progress of the processing and forming a good correspondence with the aforementioned wheel hub structure embodiment.

[0061] Please see Figure 6 The internal support mechanism used in the wind turbine hub internal support processing method is an internal support mechanism 400. The internal support mechanism 400 is used to provide radial support for the interior of the hub 100 in steps 3 and 4.

[0062] Specifically, the internal support mechanism 400 includes a support rod 41, a plurality of collars 42 sleeved on the outside of the support rod 41, a rotating rod 43 rotatably connected to the collars 42, a longitudinal plate 44 disposed on one side of the internal support mechanism 400, a cylinder 45 rotatably connected to the support rod 41, and an arc plate 46 snap-fitted to the longitudinal plate 44. Specifically, in this embodiment, the longitudinal plate 44 and the arc plate 46 are snap-fitted together for easy disassembly and can be applied to wheel hubs of different sizes.

[0063] The support rod 41 is arranged along the axial direction of the internal support mechanism 400 and is introduced into the hub 100 through the bottom through hole 33 in step 3. The support rod 41 serves as the central shaft component of the internal support mechanism 400 and is used to support the collar 42 and its connected support components.

[0064] Several collars 42 are spaced apart along the axial direction of the support rod 41 and are fixedly connected to the support rod 41. At least one rotating rod 43 is rotatably connected to the outer side of each collar 42. One end of the rotating rod 43 is rotatably connected to the collar 42, and the other end is connected to the longitudinal plate 44, so that the longitudinal plate 44 can swing radially relative to the support rod 41. Furthermore, a cylinder 45 is rotatably connected to the center position of the topmost rotating rod 43.

[0065] The cylinder 45 pushes its piston rod to extend, and the force is directly transmitted to the center of the rotating rod 43 that is hinged to it. The longitudinal plate 44, through its connection with the rotating rod 43, causes the rotating rod 43 to swing around the point of rotational connection with the collar 42.

[0066] During the swinging process of the rotating rod 43, the longitudinal plate 44 connected to it drives the arc plate 46 to gradually open outward, so that the arc plate 46 moves closer to the inner wall of the hub 100 in the radial direction, and finally forms a close support with the arc surface 25 area inside the hub 100. Thus, the internal support mechanism 400 forms a multi-point radial support state inside the hub 100.

[0067] In step 4, when the internal support mechanism 400 is in the aforementioned radially tightened state, lateral holes are machined on the side surface 2 of the hub 100 to form a side through hole 22, a first mounting hole 23, and a second mounting hole 24. During this process, the support rod 41 remains axially positioned, the collar 42 and the rotating rod 43 remain in the extended position, and the arc plate 46 continuously provides radial support to the interior of the hub 100.

[0068] After the side through hole 22, the first mounting hole 23 and the second mounting hole 24 are processed, the cylinder 45 moves in the opposite direction, causing the rotating rod 43 to rotate, which drives the longitudinal plate 44 and the arc plate 46 to retract inward, releasing the radial support inside the hub 100. Then the internal support mechanism 400 exits the hub 100 through the bottom through hole 33 and proceeds to step 5.

[0069] Therefore, when machining the side holes in the hub 100, there is no need to repeatedly flip or reclamp the hub 100; the machining operation in the side direction 2 can be completed with the bottom surface 3 as the reference. The internal support mechanism 400 is introduced into the hub 100 through the bottom through hole 33 and forms a stable radial support inside the hub, so that the hub 100 always maintains the predetermined clamping posture during the side machining process.

[0070] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0071] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0072] The above description, based on the preferred embodiments of the present invention, provides guidance. Those skilled in the art can make various changes and modifications without departing from the scope of the invention. The technical scope of this invention is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A wind turbine hub, characterized in that: Includes a top surface (1), a side surface (2), and a bottom surface (3). The top surface (1) has a top surface boss (11) at its top. A top surface through hole (12) is provided at the center of the top surface boss (11). Three sets of bearing bosses (13) are formed on the outer wall of the top surface boss (11). Each set of bearing bosses (13) has a reinforcing rib (131) perpendicular to the bearing boss (13), and a reinforcing hole (132) is provided through the bearing boss (13). The reinforcing rib (131) is located between two adjacent sets of bearing bosses. The mounting boss (13) is integrally formed with the hub (100). The side surface (2) is symmetrically provided with side grooves (21). The side grooves (21) are provided with side through holes (22). The end of the side surface (2) is provided with a first mounting hole (23) and a second mounting hole (24) for connecting the pitch system. The bottom surface (3) is formed with a bottom groove (31) at the center. The bottom groove (31) is provided with a bottom through hole (33) at the center. The bottom surface (3) is also provided with weight reduction holes (34) distributed around it.

2. A wind turbine hub according to claim 1, characterized in that: The bearing boss (13) is configured as a rib-shaped structure with a high middle height and low side heights. The reinforcing hole (132) is opened in the middle position, and the reinforcing rib (131) is arranged adjacent to the reinforcing hole (132).

3. The method for processing a wind turbine hub and its internal support according to claim 1, characterized in that: The side groove (21) has an arc groove (211) formed on the side near the top surface (1), and the arc groove (211) has a second mounting hole (24) at the top position.

4. The method for processing a wind turbine hub and its internal support according to claim 1, characterized in that: An arc surface (25) is formed between each pair of the sides (2), the center of the arc surface (25) is thicker than the two ends, and the side through holes (22) are opened at the corresponding positions on both sides of the arc surface (25).

5. A method for processing an internal support for a wind turbine hub, used for a wind turbine hub as described in any one of claims 1-4, characterized in that: Includes the following steps: S1. Place the wheel hub (100) casting blank on the processing equipment and clamp and position it with the bottom surface (3) facing the processing spindle. S2. Machining is performed on the bottom surface (3) to form a bottom groove (31) and a bottom through hole (33) located at its center. S3. An internal support mechanism that can be radially expanded is introduced into the hub (100) through the bottom through hole (33) so that the internal support mechanism is tightened inside the hub (100) to form radial support inside the hub. S4. With the internal support mechanism in a tightened state, the side (2) is machined with a lateral hole to form a side through hole (22) and a first mounting hole (23) and a second mounting hole (24). S5. Remove the internal support mechanism and complete the subsequent processing of the wheel hub (100).

6. The method for processing the internal support of a wind turbine hub according to claim 5, characterized in that: The internal support structure is a multi-point radial support structure, with its support points distributed along the circumference of the hub (100) and corresponding to the area where the arc surface (25) is located.

7. The method for processing the internal support of a wind turbine hub according to claim 6, characterized in that: When the multi-point radial support structure is in a tightened state, its supporting force is transmitted along the arc surface (25) to the circumference and axial direction of the hub (100), so that the hub (100) maintains the force state defined by the arc surface (25) during the side hole machining process.

8. The method for processing the internal support of a wind turbine hub according to claim 7, characterized in that: The side through hole (22), the first mounting hole (23), and the second mounting hole (24) are all processed under the condition of continuous tension of the internal support structure.

9. A method for processing an internal support for a wind turbine hub according to claim 8, characterized in that: The processing direction of the side through hole (22) is consistent with the extension direction of the side groove (21), and is located on both sides of the arc surface (25).

10. A method for processing an internal support for a wind turbine hub according to claim 8, characterized in that: During the machining of the side holes, the internal support structure is always in a radially tightened state, and is released after the machining of the side through holes (22), the first mounting hole (23), and the second mounting hole (24) is completed.

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