Combined ladder stand structure, hub assembly and wind generating set

Abstract

The utility model relates to a combined crawling ladder structure, a hub assembly and a wind generating set, and the combined crawling ladder structure comprises a supporting frame; the ladder stand assembly comprises a plurality of ladder stand units arranged around the periphery of the supporting frame, one ends of the ladder stand units are gathered on the supporting frame and connected with the supporting frame, the other ends of the ladder stand units are arranged in a scattered mode towards the side away from the supporting frame, fixing pieces are arranged on the ladder stand units, and the ladder stand units are connected with the supporting frame. The fixing piece is used for being connected with the hub; and the reinforcing supporting pieces are connected between every two adjacent ladder stand assemblies. The combined crawling ladder structure provided by the embodiment of the utility model adopts a modular design, is convenient to mount and can adapt to hubs with different sizes.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and in particular to a combined ladder structure, hub assembly and wind turbine generator set. Background Technology

[0002] In existing wind turbine generator sets, a hub is typically included to assemble the blades into a rotor. As the capacity of a single wind turbine generator set increases, the blade length, hub diameter, and other dimensions also increase. To facilitate personnel access to and from the hub, a ladder is usually installed inside the hub. However, existing ladders typically have a relatively fixed structure and cannot be flexibly adjusted in length or angle, making them unsuitable for use with hubs of different sizes and structures.

[0003] Therefore, there is an urgent need for a modular design that can adapt to different sizes of wheel hubs, as well as corresponding wheel hub assemblies and wind turbine generator sets. Utility Model Content

[0004] This application provides a combined ladder structure, hub assembly, and wind turbine generator set. The ladder structure can be adapted to hubs of different sizes.

[0005] In a first aspect, according to an embodiment of this application, a combined ladder structure is proposed for a wheel hub. The combined ladder structure includes: a support frame; a ladder assembly including a plurality of ladder units arranged around the outer periphery of the support frame, one end of each ladder unit converging at and connecting to the support frame, and the other end of each ladder unit being dispersed to a side away from the support frame, and a fixing member being provided on the ladder unit for connecting to the wheel hub; and a reinforcing support member connecting two adjacent ladder units.

[0006] According to one aspect of the embodiments of this application, the support frame has a cavity that extends through a first direction, and a fastener is disposed on one side of the ladder assembly in the first direction. The fastener includes a raised portion and a connecting portion that are connected to each other. The raised portion extends along the first direction, and the connecting portion is used to connect with a wheel hub.

[0007] According to one aspect of the embodiments of this application, a plurality of climbing ladder units include a first climbing ladder unit and a second climbing ladder unit arranged alternately along the circumference of a support frame, each first climbing ladder unit being connected to the support frame, and each second climbing ladder unit being connected to the support frame through two adjacent first climbing ladder units.

[0008] According to one aspect of the embodiments of this application, the support frame has a ring structure and includes a plurality of sequentially arranged connecting frames. The support frame as a whole has a polygonal frame structure, and each first ladder unit abuts against one of the connecting frames and is detachably connected to each other.

[0009] According to one aspect of the embodiments of this application, the ladder unit includes two side supports and a plurality of cross braces connected between the two side supports. The plurality of connecting frames are arranged in a one-to-one correspondence with the plurality of ladder units, and the plurality of connecting frames extend parallel to the cross braces of the plurality of ladder units respectively.

[0010] According to one aspect of the embodiments of this application, the support frame has a cavity that extends through a first direction, and the reinforcing support member includes a first sub-member and a second sub-member, which are respectively connected to opposite side surfaces of the ladder unit in the first direction; the first sub-member and the second sub-member are symmetrically arranged in the first direction.

[0011] According to one aspect of the embodiments of this application, the ladder unit includes two side supports and a plurality of cross braces connected between the two side supports. A reinforcing support is connected to the side supports, and the end of the reinforcing support connected to the side supports is staggered from the end of each cross brace connected to the side supports.

[0012] According to one aspect of the embodiments of this application, the structural strength of the fastener is greater than the structural strength of the climbing ladder unit; the climbing ladder assembly further includes a plurality of first fasteners and a plurality of second fasteners, the diameter of the first fasteners is smaller than the diameter of the second fasteners, the reinforcing support member and the climbing ladder unit, and the support frame and the climbing ladder unit are detachably connected by the first fasteners, and the fastener and the hub, and the climbing ladder unit and the fastener are detachably connected by the second fasteners.

[0013] According to one aspect of the embodiments of this application, the torque borne by the first fastener is 8 N·m to 12 N·m, and the torque borne by the second fastener is 57 N·m to 63 N·m.

[0014] Secondly, according to the embodiments of this application, a hub assembly is proposed, including: a hub that encloses and forms a receiving cavity, the hub being provided with a nacelle connection opening, a plurality of blade connection openings and a manhole, the nacelle connection opening, the blade connection openings and the manhole being spaced apart from each other and respectively communicating with the receiving cavity, the hub including a connection area surrounding the nacelle connection opening; a combined ladder structure in any embodiment of the first aspect is disposed in the receiving cavity, the ladder unit being connected to the connection area through a fastener, and at least one ladder unit extending in the direction pointing towards the manhole.

[0015] Thirdly, according to embodiments of this application, a wind turbine generator set is provided, including the hub assembly in any embodiment of the second aspect.

[0016] The combined ladder structure provided in this application is applied to a wheel hub. This combined ladder structure includes a support frame, ladder components, and reinforcing support members. The support frame is located in the center, and each ladder unit in the ladder component is arranged around the outer periphery of the support frame. One end of each ladder unit is connected to the support frame, and multiple ladder units can extend radially outwards around the support frame. The structures of each ladder unit can be identical or similar. Each ladder unit in this combined ladder structure adopts the same standard design and can be easily matched to wheel hubs of different sizes / structures by setting different numbers and lengths of ladder units. It is easy to install and has low cost. Attached Figure Description

[0017] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of a combined ladder structure provided in one embodiment of this application;

[0019] Figure 2 This is a schematic diagram of a combined ladder structure provided in another embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the structure of a wheel hub assembly provided in another embodiment of this application;

[0021] Figure 4 This is a schematic diagram of the structure of a wind turbine generator set provided in one embodiment of this application.

[0022] in:

[0023] 100 - Combined ladder structure; 200 - Wheel hub assembly;

[0024] 10-Support frame; 20-Ladder assembly; 30-Reinforcing support; 40-Wheel hub;

[0025] 11-Cavity; 12-Connecting frame; 21-Ladder unit; 22-Fixed component; 23-First fastener; 24-Second fastener; 31-First sub-component; 32-Second sub-component; 41-Nacelle connection opening; 42-Blade connection opening; 43-Manhole; 44-Connection area;

[0026] 211-First climbing ladder unit; 212-Second climbing ladder unit; 213-Side support; 214-Horizontal brace; 221-Elevation part; 222-Connecting part;

[0027] X - First direction. Detailed Implementation

[0028] The features and exemplary embodiments of various aspects of this application will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this application by illustrating examples. In the accompanying drawings and the following description, at least some well-known structures and techniques are not shown to avoid unnecessarily obscuring the application; and, for clarity, the dimensions of some structures may be exaggerated. Furthermore, the features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0029] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the molding die and molding method of this application. It should also be noted that, unless otherwise explicitly specified and limited, "multiple" means two or more, and the terms "installation" and "connection" 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 direct connection or an indirect connection. The terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art will understand the specific meaning of these terms in this application based on the specific circumstances.

[0031] With the development of wind power generation technology, the single-unit capacity of existing wind turbine generators is constantly increasing, and the size of their components is also increasing accordingly, including the hub used to connect the main shaft and blades. The hub is usually a hollow structure with manholes on its surface for workers to pass through. Due to the large diameter of the hub, ladders are usually installed inside to allow workers to enter the hub or to repair / maintain the top inner side of the hub.

[0032] Based on this, the applicant found that existing ladders usually have a relatively fixed structure and cannot be easily adapted to wheel hubs of different sizes and structures. They need to be designed and manufactured separately for different wheel hubs, which is costly.

[0033] To address the aforementioned issues, this application proposes a modular ladder structure that, through its modular design, can be adapted to different wheel hubs and reduce costs.

[0034] It is understood that the following embodiments of this application are only used as an example of applying the combined ladder structure to the hub of a wind turbine generator set. However, the combined ladder structure provided in the embodiments of this application is not limited to the following embodiments. It can also be used in other situations where ladders need to be installed on rotating structures with a large diameter, and to protect them.

[0035] To better understand this application, the following will be combined with... Figures 1 to 4 This application provides a detailed description of the combined ladder structure, hub assembly, and wind turbine generator set.

[0036] Please refer to the following: Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of a combined ladder structure provided in one embodiment of this application. Figure 2 This is a schematic diagram of a combined ladder structure provided in another embodiment of this application.

[0037] In a first aspect, according to an embodiment of this application, a combined ladder structure 100 is provided for a wheel hub 40. The combined ladder structure 100 includes: a support frame 10; a ladder assembly 20, including a plurality of ladder units 21 arranged around the outer periphery of the support frame 10, one end of each ladder unit 21 converging at and connecting to the support frame 10, and the other end of each ladder unit 21 being dispersed to the side away from the support frame 10, and a fixing member 22 being provided on the ladder unit 21 for connecting to the wheel hub 40; and a reinforcing support member 30, wherein a reinforcing support member 30 is connected between two adjacent ladder units 21.

[0038] This application provides a combined ladder structure 100 that can be applied to the hub 40 of a wind turbine generator set, allowing workers to enter and exit the hub 40 when it is in a working position. Specifically, the combined ladder structure 100 includes a support frame 10, a ladder assembly 20, and a reinforcing support member 30. The support frame 10 is located at the center of the combined ladder structure 100, forming an inner support. The ladder assembly 20 includes multiple ladder units 21 and a fixing member 22 for connecting the ladder units 21 to the hub 40. One end of each ladder unit 21 is positioned close to the support frame 10 and extends in a direction away from the support frame 10. The multiple ladder units 21 can be spaced apart in the circumferential direction of the support frame 10, forming a radial structure extending in different directions, so that different ladder units 21 can be selected according to the entry position after the hub 40 rotates.

[0039] Furthermore, the multiple climbing units 21 in the climbing ladder assembly 20 are respectively connected to the hub 40 via connectors. The connectors can be located near the end of each climbing unit 21 away from the support frame 10, and each connector can be located on the same side of each climbing unit 21 to facilitate connection with the hub 40 while avoiding interference with workers' climbing. The connectors can be configured to correspond one-to-one with each climbing unit 21, so that each climbing unit 21 can be stably connected to the hub 40. By connecting one end of the climbing unit 21 to the support frame 10 and the other end to the hub 40, its structure can be made stable and reliable.

[0040] In the ladder assembly 20, each ladder unit 21 can have the same structure and be made of the same material. Therefore, when manufacturing the ladder unit 21, it can be obtained by first manufacturing a long ladder base material and then cutting the base material into a preset length. The design and processing methods of the long ladder base material are mature, and existing ordinary long ladders that meet structural strength standards can be used without the need for separate design and mold manufacturing, thereby further reducing processing costs.

[0041] The combined ladder structure 100 also includes multiple reinforcing support members 30, which extend circumferentially along the support frame 10 and connect between adjacent ladder units 21 to reinforce the stability of the relative positions between adjacent ladder units 21. Optionally, a reinforcing support member 30 can be provided between every two ladder units 21, and each reinforcing support member 30 can be configured to have the same length and the same distance between it and the center of the support frame 10, so that the ladder components 20 are subjected to uniform force.

[0042] The combined ladder structure 100 in this embodiment consists of a support frame 10, a ladder assembly 20, and a reinforcing support member 30. The ladder assembly 20 includes ladder units 21 and fixing members 22. Each ladder unit 21 is connected to the wheel hub 40 through the fixing members 22 and is connected and fixed through the support frame 10 and the reinforcing support member 30. The components are easy to connect. By adjusting the connection position of the ladder units 21 on the support frame 10, the number of ladder units 21, and the length of each ladder unit 21, the combined ladder structure 100 can be easily adapted to wheel hubs 40 of different sizes and structures.

[0043] In some alternative embodiments, the support frame 10 has a cavity 11 that extends along a first direction X, and a fastener 22 is disposed on one side of the ladder assembly 20 in the first direction X. The fastener 22 includes an elevating portion 221 and a connecting portion 222 that are connected to each other. The elevating portion 221 extends along the first direction X, and the connecting portion 222 is used to connect with the hub 40.

[0044] In this embodiment, the support frame 10 may be annular and detachably connected to at least some of the climbing units 21. The annular structure encloses a cavity 11, and each climbing unit 21 extends radially along the cavity 11. Optionally, the support frame 10 may be a polygonal annular structure to facilitate connection with each climbing unit 21.

[0045] Based on this, the axial direction of the cavity 11, i.e., the through direction, is denoted as the first direction X. Each fixing member 22 is located on the same side of the climbing unit 21 in the first direction X, and is used to connect each climbing unit 21 to the hub 40. Specifically, the fixing member 22 may include a raised portion 221 and a connecting portion 222, which are connected to each other. The connection method can be selected as fastener connection, welding connection, or integral installation.

[0046] The raised portion 221 extends at least partially along the first direction X, providing a certain distance between the climbing unit 21 and the hub 40 in the first direction X, reducing interference between the climbing assembly 20 and other components connected to the hub 40. Simultaneously, the space created facilitates the gripping of the climbing unit 21 by workers climbing. Each fixing member 22 may have a raised portion 221, and the structure and dimensions of each raised portion 221 may be identical to facilitate manufacturing.

[0047] The connecting portion 222 is used to connect the raised portion 221 to the wheel hub 40. The connecting portion 222 may have a connecting hole for fasteners to pass through, so as to facilitate a detachable connection with the wheel hub 40 by fasteners. The connecting portion 222 may extend along a plane intersecting the second direction so that it can be adapted to fit the wheel hub 40.

[0048] For example, the raised portion 221 can be annular or U-shaped, and connected to the ladder unit 21 via one side or the two ends of the U-shape, such that the opposite side is spaced apart from the ladder unit 21. The connecting portion 222 can be configured to be located on the side spaced apart from the ladder unit. Simultaneously, the raised portion 221 can have a certain extension dimension along the radial direction of the cavity 11 to achieve higher structural strength.

[0049] In some alternative embodiments, the plurality of climbing units 21 include first climbing units 211 and second climbing units 212 arranged alternately along the circumference of the support frame 10, each first climbing unit 211 being connected to the support frame 10, and each second climbing unit 212 being connected to the support frame 10 through two adjacent first climbing units 211.

[0050] Among the multiple climbing ladder units 21, there may be two types of climbing ladder units 21 with different lengths: a first climbing ladder unit 211 and a second climbing ladder unit 212. The first climbing ladder unit 211 may have a larger length and be directly connected to the central support frame 10, while the second climbing ladder unit 212 may have a relatively smaller length and be connected to the adjacent first climbing ladder unit 211, indirectly connected to the support frame 10 through the first climbing ladder unit 211.

[0051] The extension dimensions of the two types of ladder units 21 can be set according to the size of the hub 40, and the longer first ladder unit 211 can extend to the manhole 43 of the hub 40 to facilitate personnel entering and exiting the hub 40. Taking the hub 40 as an example that can be equipped with three blades, the ladder assembly 20 can include three first ladder units 211 and three second ladder units 212. The first ladder units 211 and the second ladder units 212 are arranged alternately, and the included angle between the extension directions of every two adjacent ladder assemblies 20 can be the same or similar.

[0052] By setting multiple climbing ladder units 21 as first climbing ladder unit 211 and second climbing ladder unit 212 of different lengths and alternating between them, the size of the required support frame 10 can be reduced, the cost of setting the horizontal support for stepping in the support frame 10 can be eliminated, making it easier for people to climb, while avoiding the interference between each climbing ladder unit 21 that gathers at one end of the support frame 10.

[0053] In some alternative embodiments, the support frame 10 has a ring-shaped structure and includes a plurality of sequentially arranged connecting frames 12. The support frame 10 has an overall polygonal frame structure, and each first ladder unit 211 abuts against one of the connecting frames 12 and is detachably connected to each other.

[0054] The support frame 10 in this embodiment may include multiple connecting borders 12, which can be connected end to end to form a ring structure, making the support frame 10 as a whole a polygonal ring structure. Based on this, multiple longer first ladder units 211 can be connected to the multiple connecting borders 12, optionally in a detachable connection via fasteners.

[0055] The number of connecting frame 12 in the support frame 10 can correspond to the number of climbing units 21, so that it forms a polygonal ring structure with the same number of sides as the number of climbing units 21, and some of the connecting frame 12 are used to connect with the longer first climbing unit 211, which can be detachably connected by fasteners.

[0056] By setting the support frame 10 as a whole in a ring shape and connecting it to multiple first climbing ladder units 211 at the same time, the structural strength of the support frame 10 can be improved, further stabilizing its support for the climbing ladder units 21. At the same time, by connecting each first climbing ladder unit 211 to a connecting frame 12 and connecting the second climbing ladder unit 212 to the adjacent first climbing ladder unit 211 through the reinforcing support member 30, the climbing ladder unit 21, the support frame 10 and the reinforcing support member 30 can be connected into a whole to form a stable and reliable load-bearing structure, thereby improving the reliability of the combined climbing ladder structure 100.

[0057] In some optional embodiments, the ladder unit 21 includes two side supports 213 and a plurality of cross braces 214 connected between the two side supports 213. A plurality of connecting frames 12 are provided in a one-to-one correspondence with a plurality of ladder units 21, and the plurality of connecting frames 12 extend parallel to the cross braces 214 of the plurality of ladder units 21.

[0058] The ladder unit 21 may include two parallel side supports 213 and multiple cross braces 214 connected between the side supports 213. The side supports 213 provide support and fixation, while the cross braces 214 are used for gripping and stepping. The side supports 213 may extend radially along the support frame 10, and the extension direction of the cross braces 214 may be perpendicular to the extension direction of the side supports 213. The cross-sectional area of ​​the cross braces 214 may be smaller than that of the side supports 213 to give the side supports 213 greater structural strength. The multiple cross braces 214 may be parallel to each other and equally spaced along the extension direction of the side supports 213, with a spacing of approximately 30cm between adjacent cross braces 214 to facilitate climbing. The side supports 213 and the cross braces 214 may be connected by detachable fasteners, welding, or as a single unit.

[0059] For example, in an embodiment where the ladder assembly 20 includes three first ladder units 211 and three second ladder units 212, the support frame 10 can be in the form of a hexagonal ring structure, that is, it includes six connecting frames 12, which may include three first connecting frames 12 and three second connecting frames 12. The three first connecting frames 12 are connected to the first ladder units 211 one by one, and the three second connecting frames 12 are connected to the second ladder units 212 one by one and spaced apart. At this time, the first connecting frames 12 and the second connecting frames 12 can also be alternately arranged one by one.

[0060] Furthermore, the length of the first connecting frame 12 in the support frame 10 can be less than the length of the second connecting frame 12, and each connecting frame 12 can be parallel to the cross brace 214 in its corresponding climbing unit 21. This allows the second connecting frame 12 corresponding to the second climbing unit 212 to be used as a cross brace 214 of the second climbing unit 212, thereby solving the problem that the spacing between the cross braces 214 is too large and inconvenient for climbing due to the spacing between the second climbing unit 212 and the support frame 10. At the same time, the first connecting frame 12 and the cross brace 214 of the first climbing unit 211 are arranged parallel to each other so that they can abut against each other and connect.

[0061] Similarly, in an embodiment where the ladder assembly 20 includes three first ladder units 211 and three second ladder units 212, each first ladder unit 211 can extend in the same direction as one second ladder unit 212, and their side supports 213 can be located on the same straight line. In this case, a first connecting frame 12 in the support frame 10 is connected to the cross brace 214 of the first ladder unit 211, while an opposite second connecting frame 12 is located between the first ladder unit 211 and the second ladder unit 212 and is spaced apart from both, serving as a supplementary cross brace 214, allowing personnel to move conveniently on the two ladder units 21 extending in the same direction.

[0062] In some optional embodiments, the support frame 10 has a cavity 11 that extends through the first direction X, and the reinforcing support member 30 includes a first sub-member 31 and a second sub-member 32, which are respectively connected to the two opposite side surfaces of the ladder unit 21 in the first direction X; the first sub-member 31 and the second sub-member 32 are symmetrically arranged along the first direction X.

[0063] The combined ladder structure 100 in this embodiment is provided with a reinforcing support 30 for reinforcing the relative position between ladder units 21. The reinforcing support 30 is connected between two adjacent ladder units 21. In this regard, at least part of the reinforcing support 30 may include a first sub-component 31 and a second sub-component 32. The two sub-components may be detachably connected or set independently of each other.

[0064] Both the first sub-component 31 and the second sub-component 32 are connected between two adjacent ladder units 21, and they can have the same shape and structure, respectively clamping the ladder unit 21 between them from both sides. In the first direction X, the first sub-component 31 and the second sub-component 32 can be arranged facing each other and symmetrically, that is, the first sub-component 31 and the second sub-component 32 are symmetrical about a reference plane, which can be selected to be perpendicular to the first direction X.

[0065] Optionally, the first sub-component 31 and the second sub-component 32 are respectively connected to opposite sides of the climbing unit 21 in the first direction X. They can be connected to the climbing unit 21 by fasteners respectively, or a longer fastener can be used so that the same fastener passes through the first sub-component 31, the second sub-component 32 and the climbing unit 21 at the same time, so as to reduce costs and facilitate the provision of connection holes on the climbing assembly 20.

[0066] By having the first sub-component 31 and the second sub-component 32 clamp the climbing unit 21 from both sides, the connection between the reinforcing support member 30 and the climbing unit 21 can be further stabilized, making it easier to fix the position of the climbing unit 21. By symmetrically arranging the first sub-component 31 and the second sub-component 32, the climbing unit 21 can be subjected to uniform force.

[0067] In some optional embodiments, the ladder unit 21 includes two side supports 213 and a plurality of cross braces 214 connected between the two side supports 213. The reinforcing support 30 is connected to the side supports 213, and the end of the reinforcing support 30 connected to the side supports 213 is staggered from the end of each cross brace 214 connected to the side supports 213.

[0068] As mentioned above, the ladder unit 21 may include two oppositely arranged side supports 213 and a plurality of cross braces 214 connected between the side supports 213. On this basis, the reinforcing support 30 may be connected to the side supports 213. In the embodiment where the reinforcing support 30 includes a first sub-component 31 and a second sub-component 32, the cross section of the side support 213 may be rectangular or I-shaped, wherein the two opposite sides arranged in the first direction X may be perpendicular to the first direction X, and the two sub-components may abut against the two opposite surfaces respectively to make the connection stable.

[0069] Furthermore, the position where the reinforcing support 30 is connected to the side bracket 213 is designated as the first connection point, and the position where each cross brace 214 is connected to the side bracket 213 is designated as the second connection point. The first connection point and the second connection point are staggered from each other, or can be set to be spaced apart from each other, so as to facilitate the installation of fasteners. At the same time, it can reduce the possibility of stress concentration at the overlapping position of the two connection points, which may cause damage or deformation to the climbing unit 21, and further improve the reliability of the combined climbing structure 100.

[0070] In some optional embodiments, the structural strength of the fastener 22 is greater than that of the climbing unit 21; the climbing assembly 20 also includes a plurality of first fasteners 23 and a plurality of second fasteners 24, the diameter of the first fasteners 23 is smaller than the diameter of the second fasteners 24, the reinforcing support 30 and the climbing unit 21 are detachably connected by the first fasteners 23, the support frame 10 and the climbing unit 21 are detachably connected by the second fasteners 24, and the fastener 22 and the hub 40 are detachably connected by the second fasteners 24.

[0071] The ladder assembly 20 in this embodiment includes a ladder unit 21 and a fixing member 22. To ensure a stable and reliable connection between the ladder unit 21 and the hub 40, the structural strength of the fixing member 22 can be greater than that of the ladder unit 21, so as to provide sufficient and stable support force to the ladder unit 21. The fixing member 22 may be made of steel to improve structural strength, and the ladder unit 21 may be made of aluminum alloy to reduce weight.

[0072] In the combined ladder structure 100, the support frame 10 and the ladder unit 21, the ladder unit 21 and the fixing member 22, and the various structures within the ladder unit 21 itself can all be connected by fasteners, making the combined ladder structure 100 easy to assemble and allowing for flexible adjustment of its structure. Specifically, the ladder assembly 20 includes two different sizes of fasteners, namely a first fastener 23 and a second fastener 24, wherein the second fastener 24 has a larger diameter. Both fasteners can be selected as bolt and nut combinations. For example, the first fastener 23 can be selected as an M10 bolt and a corresponding nut, and the second fastener 24 can be selected as an M16 bolt and a corresponding nut. Setting both fasteners as standard parts can further reduce costs and facilitate installation.

[0073] Based on this, the smaller diameter first fastener 23 can be used for the connection between the climbing ladder units 21, that is, the connection between the reinforcing support 30 and the climbing ladder unit 21 and the connection between the support frame 10 and the climbing ladder unit 21 is made using the first fastener 23. The larger diameter second fastener 24 can be used for the connection between the climbing ladder unit 21 and the wheel hub 40, that is, the connection between the fixing member 22 and the wheel hub 40 and the connection between the fixing member 22 and the climbing ladder unit 21 is made using the second fastener 24.

[0074] By using fasteners of different diameters at different locations, greater connection strength can be provided at the locations that support each ladder unit 21, thereby reducing the cost of the combined ladder structure 100 while ensuring its good reliability.

[0075] In some optional embodiments, the first fastener 23 bears a torque of 8 N·m to 12 N·m, and the second fastener 24 bears a torque of 57 N·m to 63 N·m.

[0076] In the embodiment employing two types of fasteners, the first fastener 23 and the second fastener 24 can be installed with different torques. Specifically, the first fastener 23 can be installed with a torque of 8 N·m to 12 N·m, more preferably around 10 N·m, while the second fastener 24 can be installed with a torque of 57 N·m to 63 N·m, more preferably around 60 N·m.

[0077] As mentioned above, to reduce weight and cost, each ladder unit 21 in the ladder assembly 20 may be made of aluminum alloy and may be cut from a long ladder substrate to the required length. Since aluminum alloy is relatively soft, it cannot typically be subjected to the same construction torque as steel structures. By setting the first fastener 23 and the second fastener 24 to be installed with different torques, the possibility of damage to the ladder unit 21 under pressure can be reduced, while also meeting the construction requirements for fastener torque and ensuring the connected components are tightly fitted, thereby improving the overall reliability of the combined ladder structure 100.

[0078] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of a wheel hub assembly 200 provided in another embodiment of this application.

[0079] Secondly, according to the embodiments of this application, a hub assembly 200 is provided, including: a hub 40, which encloses and forms a receiving cavity, the hub 40 being provided with a nacelle connection opening 41, a plurality of blade connection openings 42 and a manhole 43, the nacelle connection opening 41, the blade connection openings 42 and the manhole 43 being spaced apart from each other and respectively communicating with the receiving cavity, the hub 40 including a connection area 44 surrounding the nacelle connection opening 41; a combined ladder structure 100 in any embodiment of the first aspect is provided in the receiving cavity, the ladder unit 21 being connected to the connection area 44 by a fixing member 22, and at least one ladder unit 21 extending in the direction pointing to the manhole 43.

[0080] This application also proposes a hub assembly 200, including a hub 40 and a combined ladder structure 100 connected to the hub 40. Specifically, the hub 40 is a hollow structure that encloses a receiving cavity. The hub 40 has a nacelle connection opening 41 facing the nacelle side for connection to the main shaft, a blade connection opening 42 for connection to the blades, and a manhole 43 for personnel to enter and exit the hub 40. Optionally, the hub 40 may have one nacelle connection opening 41, three blade connection openings 42, and three manholes 43. The blade connection openings 42 and manholes 43 may be equally spaced around the circumference of the nacelle connection opening 41. The manholes 43 may be circular holes with a diameter greater than or equal to 60 cm to facilitate personnel passage.

[0081] Furthermore, the hub 40 is provided with a connection area 44 surrounding the engine compartment connection opening 41. This connection area 44 may be annular and has multiple connection holes. At least a portion of the connection holes are arranged at intervals along the circumference of the engine compartment connection opening 41. These connection holes may be used for connection with the main shaft. In addition, the connection area 44 may also be provided with connection holes for connection with the fixing member 22. These connection holes may be located between the aforementioned main shaft connection holes or on the side of the main shaft connection hole near the center of the engine compartment connection opening 41, so as to avoid interference with the connection of the main shaft caused by the installation of the combined ladder structure 100.

[0082] When connecting the combined ladder structure 100 to the wheel hub 40, the extension direction of each ladder unit 21 can be adjusted to correspond to the location of the manhole 43. That is, at least some of the ladder units 21 can extend in a direction from the center of the support frame 10 toward each manhole 43 to facilitate entry and exit from the wheel hub 40 through the manhole 43. Alternatively, in embodiments where the ladder unit 21 includes a first ladder unit 211 and a second ladder unit 212, each first ladder unit 211 can extend in a direction toward the manhole 43.

[0083] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of a wind turbine generator set provided in one embodiment of this application. In a third aspect, an embodiment of this application provides a wind turbine generator set including the hub assembly 200 as described in any embodiment of the second aspect.

[0084] The hub assembly 200 and wind turbine generator set provided in this application have all the beneficial effects of the combined ladder structure 100 provided in this application. For details, please refer to the specific description of the combined ladder structure 100 in the above embodiments. This embodiment will not repeat the description here.

[0085] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A combination ladder structure for a wheel hub, characterized by, The combined ladder structure comprises: a support frame; a ladder assembly comprising a plurality of ladder units arranged around the outer periphery of the support frame, one end of each of the ladder units converging on the support frame and connected to the support frame, the other end of each of the ladder units being arranged to diverge away from the side of the support frame, the ladder units being provided with a fixing member for connecting with the hub; a reinforcing support connected between two adjacent ladder units.

2. The combination ladder structure of claim 1, wherein, The support frame has a cavity arranged through in a first direction, the fixing member being arranged on one side of the ladder assembly in the first direction, the fixing member comprising a heightening portion and a connecting portion connected to each other, the heightening portion extending in the first direction, and the connecting portion being used for connecting with the hub.

3. The combination ladder structure of claim 1, wherein, The plurality of ladder units comprises first ladder units and second ladder units arranged alternately in the circumferential direction of the support frame, each of the first ladder units being connected to the support frame, and each of the second ladder units being connected to the support frame through two adjacent first ladder units.

4. The combination ladder structure of claim 3, wherein, The support frame has a ring structure and comprises a plurality of connecting edge frames arranged in sequence, the support frame as a whole has a polygonal frame structure, each of the first ladder units abutting against one of the connecting edge frames and being detachably connected to each other.

5. The combination ladder structure of claim 4, wherein, The ladder unit comprises two side supports and a plurality of cross struts connected between the two side supports, the plurality of connecting edge frames are arranged in one-to-one correspondence with the plurality of ladder units, and the plurality of connecting edge frames extend in parallel with the cross struts of the plurality of ladder units, respectively.

6. The combination ladder structure of claim 1, wherein, The support frame has a cavity arranged through in a first direction, the reinforcing support comprises a first sub-member and a second sub-member, the first sub-member and the second sub-member being connected to the two opposite side surfaces of the ladder unit in the first direction, respectively. In the first direction, the first sub-member and the second sub-member are arranged symmetrically with respect to each other.

7. The combination ladder structure of claim 1, wherein, The ladder unit comprises two side supports and a plurality of cross struts connected between the two side supports, the reinforcing support is arranged in connection with the side supports, and the end of the reinforcing support connected to the side supports is arranged staggered with respect to the end of each of the cross struts connected to the side supports.

8. The combination ladder structure of claim 7, wherein, The structural strength of the fixing member is greater than the structural strength of the ladder unit. The ladder assembly further comprises a plurality of first fasteners and a plurality of second fasteners, the diameter of the first fasteners being smaller than the diameter of the second fasteners, the first fasteners being used for detachably connecting between the reinforcing support and the ladder unit, between the support frame and the ladder unit, the second fasteners being used for detachably connecting between the fixing member and the hub, and between the ladder unit and the fixing member.

9. The combination ladder structure of claim 8, wherein, The torque borne by the first fasteners is 8 N·m to 12 N·m, and the torque borne by the second fasteners is 57 N·m to 63 N·m.

10. A wheel hub assembly characterized by, The combined ladder structure comprises: A hub, which is enclosed to form a containing cavity, is provided with a machine cabin connecting opening, a plurality of blade connecting openings and a manhole, the machine cabin connecting opening, the blade connecting openings and the manhole are arranged at intervals and respectively communicated with the containing cavity, the hub comprises a connecting area arranged around the machine cabin connecting opening; The combination ladder structure as claimed in any one of claims 1-9 is arranged in the containing cavity, the ladder unit is arranged by connecting the connecting area through the fixing member, and at least one of the ladder units extends in the direction pointing to the manhole.

11. A wind power unit, characterized in that The hub assembly as claimed in claim 10 is included.

Images