Installation method of land-based double-impeller wind turbine generator set

Abstract

The embodiment provides a mounting method of a land double-impeller wind turbine generator set, which comprises the following steps: making a hoisting mechanism be located at a front side of a tower drum foundation to hoist a tower drum and a yaw mechanism; hoisting and positioning a double-impeller support assembly at the top of the yaw mechanism; making the hoisting mechanism be within a rotating radius of the double-impeller support assembly and close to the front side of a first end of the double-impeller support assembly to hoist and position a first nacelle at the first end of the double-impeller support assembly; controlling the yaw mechanism to yaw by a first set angle along a first direction to make the hoisting mechanism be close to the front side of a second end of the double-impeller support assembly to hoist and position a second nacelle at the second end of the double-impeller support assembly; hoisting and positioning a second impeller on the second nacelle; under the condition that the hoisting mechanism is not displaced, controlling the yaw mechanism to yaw by a second set angle along a second direction to make the hoisting mechanism be close to the front side of the first end of the double-impeller support assembly to hoist and position a first impeller on the first nacelle. The mounting efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and specifically to an installation method for an onshore dual-blade wind turbine generator set. Background Technology

[0002] Currently, in order to reduce the development cost of wind power generation, wind turbine generators are gradually developing towards large-megawatt models. Under the condition of a fixed project capacity, this can reduce the land acquisition area, the number of foundations and wind turbines purchased, and construction costs. Increasing the capacity of a single unit is one direction, but there are some bottlenecks in the design, research and development, manufacturing, and supply of large units, resulting in slow development speed and relatively high development costs.

[0003] Dual-rotor wind turbine generators represent another direction for capacity expansion, involving the installation of two rotors on a single foundation and tower. However, the installation of dual-rotor wind turbine generators is currently largely unexplored; therefore, there is an urgent need to develop an installation method for onshore dual-rotor wind turbine generators. Summary of the Invention

[0004] One of the objectives of this invention is to provide an installation method for onshore dual-blade wind turbine generator sets that is convenient and efficient to install.

[0005] According to a first aspect of the present invention, an installation method for an onshore dual-rotor wind turbine generator set is provided. The installation method includes: hoisting a tower and a yaw mechanism with a hoisting mechanism positioned in front of the tower foundation; hoisting and positioning a dual-rotor support assembly on top of the yaw mechanism; positioning the hoisting mechanism within the rotation radius of the dual-rotor support assembly and close to the front of a first end of the dual-rotor support assembly, and hoisting and positioning a first nacelle on the first end of the dual-rotor support assembly; controlling the yaw mechanism to yaw along a first direction by a first predetermined angle, so that the hoisting mechanism is close to the front of a second end of the dual-rotor support assembly, and hoisting and positioning a second nacelle on the second end of the dual-rotor support assembly; hoisting and positioning the second rotor on the second nacelle; and, without shifting the hoisting mechanism, controlling the yaw mechanism to yaw along a second direction opposite to the first direction by a second predetermined angle, so that the hoisting mechanism is close to the front of the first end of the dual-rotor support assembly, and hoisting and positioning the first rotor on the first nacelle.

[0006] According to the installation method of the onshore dual-blade wind turbine generator of the present invention, the hoisting mechanism is first positioned in front of the tower foundation, and then moved to the front of the first end of the dual-blade support assembly. In conjunction with the yaw mechanism, the front of the second end and the front of the first end of the dual-blade support assembly are brought close to the hoisting mechanism for hoisting. This effectively reduces the number of movements of the hoisting mechanism, and may even require only one movement, improving assembly efficiency. Furthermore, positioning the hoisting mechanism within the rotation radius of the dual-blade support assembly allows for better frontal contact with the first and second ends of the assembly, facilitating the frontal installation and positioning of the first nacelle, second nacelle, first impeller, and second impeller, thus simplifying installation.

[0007] Further aspects and / or advantages of the general concept of the invention will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice of the general concept of the invention. Attached Figure Description

[0008] The above and other objects and features of the present invention will become clearer from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0009] Figure 1 A schematic diagram of the structure of an onshore dual-blade wind turbine generator set according to an embodiment of the present invention is shown;

[0010] Figure 2 A partial structural schematic diagram of an onshore dual-blade wind turbine generator set according to an embodiment of the present invention is shown;

[0011] Figure 3A A top view schematic diagram of a crawler crane according to an embodiment of the present invention is shown when it is lifting a tower and a yaw mechanism;

[0012] Figure 3B A side view schematic diagram of a crawler crane according to an embodiment of the present invention is shown when it is lifting a tower and a yaw mechanism;

[0013] Figure 4A A schematic diagram showing the relative position of a crawler crane to a tower foundation during the lifting of a central support structure, according to an embodiment of the present invention, is provided.

[0014] Figure 4B This diagram shows a side view of a crawler crane according to an embodiment of the present invention when it is lifting a central support structure;

[0015] Figure 5 This diagram illustrates the structure of a crawler crane assembling the second crossbeam support assembly on the ground, according to an embodiment of the present invention.

[0016] Figure 6A This diagram shows a top view of a crawler crane lifting the second crossbeam support assembly according to an embodiment of the present invention.

[0017] Figure 6B A side view of a crawler crane lifting the second crossbeam support assembly according to an embodiment of the present invention is shown.

[0018] Figure 7 This diagram illustrates the structure of a crawler crane assembling the first crossbeam support assembly on the ground, according to an embodiment of the present invention.

[0019] Figure 8A This diagram shows a top view of a crawler crane lifting the first crossbeam support assembly according to an embodiment of the present invention.

[0020] Figure 8B This diagram shows a side view of a crawler crane lifting the first crossbeam support assembly according to an embodiment of the present invention.

[0021] Figure 9A This diagram shows a top view of a crawler crane lifting the first engine room according to an embodiment of the present invention.

[0022] Figure 9B This diagram shows a side view of a crawler crane lifting the first engine room according to an embodiment of the present invention.

[0023] Figure 9C A side view schematic diagram of a crawler crane lifting a first generator according to an embodiment of the present invention is shown;

[0024] Figure 10A A schematic diagram showing the relative position of the crawler crane to the second crossbeam support assembly during the hoisting of the second engine room and the second generator, according to an embodiment of the present invention;

[0025] Figure 10B A side view schematic diagram of a crawler crane lifting a second engine room according to an embodiment of the present invention is shown;

[0026] Figure 10C A side view schematic diagram of a crawler crane hoisting a second generator according to an embodiment of the present invention is shown;

[0027] Figure 11A This diagram illustrates the structure of a second impeller assembled on the ground in one embodiment of the present invention.

[0028] Figure 11B This diagram shows a top view of a crawler crane hoisting a second impeller according to an embodiment of the present invention.

[0029] Figure 11C A side view schematic diagram of a crawler crane hoisting a second impeller according to an embodiment of the present invention is shown;

[0030] Figure 12AThis diagram illustrates the structure of a first impeller assembled on the ground in one embodiment of the present invention.

[0031] Figure 12B This diagram shows a top view of a crawler crane hoisting the first impeller according to an embodiment of the present invention;

[0032] Figure 12C A side view schematic diagram of a crawler crane hoisting the first impeller according to an embodiment of the present invention is shown;

[0033] Figure 13 This diagram illustrates the structure of a crawler crane according to another embodiment of the present invention when the central support structure, the second main crossbeam, and the second flexible beam are assembled on the ground.

[0034] Figure 14 This diagram illustrates the structure of a crawler crane assembling the first main crossbeam and the first flexible beam on the ground, according to another embodiment of the present invention.

[0035] Figure 15 A schematic diagram of the structure of a crawler crane in another embodiment of the present invention is shown when lifting the entire double impeller support assembly.

[0036] Figures 1 to 15 Explanation of icon numbers:

[0037] 1 tower,

[0038] 2. Yaw mechanism

[0039] 3. Double impeller support assembly; 31. Central support structure; 32. First crossbeam support assembly; 321. First main crossbeam; 3211. First main crossbeam segment; 3212. Second main crossbeam segment; 322. First auxiliary crossbeam; 3221. First auxiliary crossbeam segment; 3222. Second auxiliary crossbeam segment; 323. First vertical beam; 33. Second crossbeam support assembly; 331. Second main crossbeam; 3311. Third main crossbeam segment; 3312. Fourth main crossbeam segment; 332. Second auxiliary crossbeam; 3321. Third auxiliary crossbeam segment; 3322. Fourth auxiliary crossbeam segment; 333. Second vertical beam.

[0040] 41 First engine room, 42 First generator,

[0041] 51 Second engine room, 52 Second generator,

[0042] 6. First impeller,

[0043] 7. Second impeller,

[0044] 8 tower foundations

[0045] 9. Lifting mechanism. Detailed Implementation

[0046] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but may be changed as will become clear upon understanding this disclosure, except for operations that must occur in a specific order. Furthermore, for clarity and conciseness, descriptions of features known in the art may be omitted.

[0047] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein, which will become clear upon understanding the disclosure of this application.

[0048] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more.

[0049] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts should not be limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Thus, without departing from the teaching of the examples described herein, the first component, first assembly, first region, first layer, or first part referred to as the first component, first assembly, first region, first layer, or first part may also be referred to as the second component, second assembly, second region, second layer, or second part.

[0050] In the specification, when an element such as a layer, region, or substrate is described as being "on" another element, "connected to," or "bonded to" another element, the element may be directly "on" another element, directly "connected to," or "bonded to" the other element, or one or more other elements may be present in between. Conversely, when an element is described as being "directly on" another element, "directly connected to," or "directly bonded to" another element, no other elements may be present in between.

[0051] The terminology used herein is for the purpose of describing various examples only and is not intended to limit disclosure. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the described features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. The term “a plurality” represents any quantity of two or more.

[0052] The directional terms such as "above", "below", "top" and "bottom" used in this application are all based on the orientation of the product when it is in normal use.

[0053] Unless otherwise defined, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains upon understanding the invention. Unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and in this invention, and shall not be interpreted in an idealized or overly formalistic manner.

[0054] Furthermore, in the description of the examples, detailed descriptions of well-known related structures or functions will be omitted when it is believed that such detailed descriptions would lead to a vague interpretation of the invention.

[0055] Onshore wind power has now entered the era of grid parity. To reduce wind power development costs, wind turbine generators are gradually developing towards large-megawatt models. Given a fixed project capacity, this can reduce land acquisition area, the number of foundations and turbines required, and construction costs. Increasing the capacity of a single unit is one direction, but the design, research and development, manufacturing, and supply of large units face bottlenecks, resulting in slow development speeds and relatively high development costs. Therefore, this application shifts to another direction: developing onshore dual-rotor wind turbine generators.

[0056] Onshore dual-rotor wind turbine generators (hereinafter referred to as dual-rotor units) consist of two rotors installed on a single tower foundation (8) and tower (1), each driving a generator. For example, to increase the power of a single unit to 16MW, two 8MW turbine heads can be installed on the dual-rotor unit. Dual-rotor units have at least the following advantages: 1) They can increase the single-unit capacity of a single unit, reducing the development cost of wind farms; 2) Currently, there are no 13MW, 16MW, or even 20MW turbine heads on the market, but 8MW and 10MW turbine heads are relatively mature. Compared to developing large-megawatt models, the development speed of dual-rotor units is faster and the cost is lower. Moreover, the relatively stable 8MW and 10MW turbine heads are not new and have higher reliability. Therefore, dual-rotor unit technology can be based on existing mature turbine heads, starting from the perspective of maximizing the power generation per unit, and facing the future market demand for large-capacity single-unit units. By adopting the "dual-rotor" technical form, the power generation per unit can be quickly doubled.

[0057] For wind turbines in the era of grid parity, the market has focused its R&D efforts on developing 13MW, 16MW, and 20MW models, while dual-rotor turbine technology has not yet received widespread attention, and no prototype dual-rotor turbines have yet appeared on the market. Therefore, dual-rotor turbines represent a way to reduce the cost of wind farm construction in the grid parity era, and developing a dual-rotor turbine and its corresponding installation solution is an urgent need in the current onshore wind power market.

[0058] The following will combine Figures 1 to 15 This invention introduces an onshore dual-blade wind turbine generator set and its installation method provided by embodiments of the present invention.

[0059] Figure 1 and Figure 2 This illustration shows an embodiment of an onshore dual-rotor wind turbine generator set installed using the installation method disclosed in this invention. For example... Figure 1 and Figure 2 As shown, the onshore dual-rotor wind turbine includes a tower 1, a yaw mechanism 2 mounted on top of the tower 1, a dual-rotor support assembly 3 mounted on top of the yaw mechanism 2, a first nacelle 41 and a first rotor 6 mounted at a first end of the dual-rotor support assembly 3, and a second nacelle 51 and a second rotor 7 mounted at a second end of the dual-rotor support assembly 3. The first rotor 6 and the second rotor 7 face the same side of the dual-rotor support assembly 3, which is assumed to be the front side. In a semi-direct-drive wind turbine, the engine is located inside the nacelle; in a direct-drive wind turbine, the engine is located outside the nacelle. Therefore, the nacelle referred to in this application can refer to the nacelle containing the engine in the case of a semi-direct-drive wind turbine, and can refer to the combination of the nacelle and generator in the case of a direct-drive wind turbine.

[0060] Tower 1 is installed on tower foundation 8 on the ground to support yaw mechanism 2, double impeller support assembly 3, first nacelle 41, first impeller 6, second nacelle 51 and second impeller 7.

[0061] The yaw mechanism 2 is mounted on the top of the tower 1 via a flange, and is used to drive the entire double impeller support assembly 3, the first nacelle 41, the first impeller 6, the second nacelle 51 and the second impeller 7 located thereon to rotate, so that the first impeller 6 and the second impeller 7 can face the main wind direction to generate electricity.

[0062] In one or more embodiments, the dual-impeller support assembly 3 is mounted on the yaw mechanism 2 via flanges. The dual-impeller support assembly 3 includes a central support structure 31 connected to the yaw mechanism 2, a first crossbeam support assembly 32 located on a first side of the central support structure 31, and a second crossbeam support assembly 33 located on a second side of the central support structure 31. The first crossbeam support assembly 32 has a first mounting platform at its end, a first nacelle 41 mounted on the first mounting platform, and its root connected to the central support structure 31 via flanges. The second crossbeam support assembly 33 has a second mounting platform at its end, a second nacelle 51 mounted on the second mounting platform, and its root connected to the central support structure 31 via flanges. The connection is stable and reliable.

[0063] Regarding the structure of the first crossbeam support assembly 32 and the second crossbeam support assembly 33, in the first specific embodiment, the first crossbeam support assembly 32 includes a first main crossbeam 321 and a first flexible beam (or a rigid beam). The first main crossbeam 321 is a rigid beam, and its first end is connected to the central support structure 31 via a flange. The second end of the first main crossbeam 321 is connected to the second end of the first flexible beam, and the first end of the first flexible beam is connected to the central support structure 31. The second crossbeam support assembly 33 includes a second main crossbeam 331 and a second flexible beam (or a rigid beam). The second main crossbeam 331 is a rigid beam, and its first end is connected to the central support structure 31 via a flange. The second end of the second main crossbeam 331 is connected to the second end of the second flexible beam, and the first end of the second flexible beam is connected to the central support structure 31. Therefore, the first flexible beam, the first main crossbeam 321, and the central support structure 31, when connected, roughly form a triangle, which can stably support the first nacelle 41 and the first impeller 6. Similarly, the second flexible beam, the second main crossbeam 331, and the central support structure 31, when connected, roughly form a triangle, which can stably support the second nacelle 51 and the second impeller 7. Moreover, using flexible beams as the first auxiliary crossbeam 322 and the second auxiliary crossbeam 332 results in lightweight construction, facilitating transportation and hoisting. Furthermore, since the flexible beams can be bent or straightened and unfolded, they are easy to connect with the central support structure 31, the first main crossbeam 321, and the second main crossbeam 331.

[0064] To facilitate hoisting and reduce the weight of a single hoisting, the first main crossbeam 321 and the second main crossbeam 331 can be made into multiple segments, which can be hoisted in sections and then spliced ​​together.

[0065] Furthermore, the second end of the first main crossbeam 321 is higher than its first end, while the second end of the first flexible beam is lower than its first end. This arrangement, with the second end of the first flexible beam higher than its first end, reduces the tensile force on the first flexible beam, ensuring connection stability. Additionally, the higher position of the first end of the first flexible beam facilitates its connection to the central support structure 31. Similarly, the second end of the second main crossbeam 331 is higher than its first end, while the second end of the second flexible beam is lower than its first end. This reduces the tensile force on the second flexible beam, ensuring connection stability and facilitating its connection to the central support structure 31.

[0066] In the second specific embodiment, unlike the first specific embodiment described above, both the first auxiliary crossbeam 322 and the second auxiliary crossbeam 332 are rigid beams. The second ends of the first main crossbeam 321 and the first auxiliary crossbeam 322 are connected by flanges, and the first end of the first auxiliary crossbeam 322 is connected to the central support structure 31 by a flange. The second ends of the second main crossbeam 331 and the second auxiliary crossbeam 332 are connected by flanges, and the first end of the second auxiliary crossbeam 332 is connected to the central support structure 31 by a flange.

[0067] To facilitate hoisting and reduce the weight of a single hoisting operation, the first main crossbeam 321 and the second main crossbeam 331 can be made into multiple segments, which are then hoisted separately and spliced ​​together. Similarly, the first auxiliary crossbeam 322 and the second auxiliary crossbeam 332 can also be made into multiple segments, which are then hoisted separately and spliced ​​together. Figure 1 and Figure 2 As shown, the first main crossbeam 321 includes a first main crossbeam 3211 and a second main crossbeam 3212 connected by flanges; the first auxiliary crossbeam 322 includes a first auxiliary crossbeam 3221 and a second auxiliary crossbeam 3222 connected by flanges; the second main crossbeam 331 includes a third main crossbeam 3311 and a fourth main crossbeam 3312 connected by flanges; and the second auxiliary crossbeam 332 includes a third auxiliary crossbeam 3321 and a fourth auxiliary crossbeam 3322 connected by flanges.

[0068] In addition, to reduce weight and facilitate hoisting, the cross-sectional area of ​​the first main crossbeam 321 can be larger than that of the first auxiliary crossbeam 322, and the cross-sectional area of ​​the second main crossbeam 331 can be larger than that of the second auxiliary crossbeam 332. This top-thin, bottom-thick structure ensures support stability while reducing overall weight.

[0069] Furthermore, to ensure support strength, a first vertical beam 323 can be provided between the first main crossbeam 321 and the first auxiliary crossbeam 322, for example, connecting the first main crossbeam 3211 and the first auxiliary crossbeam 3221. A second vertical beam 333 can be provided between the second main crossbeam 331 and the second auxiliary crossbeam 332, for example, connecting the third main crossbeam 3311 and the third auxiliary crossbeam 3321. The first vertical beam 323 and the second vertical beam 333 can support the main crossbeam and the auxiliary crossbeam, thereby improving the support stability of the first crossbeam support assembly 32 and the second crossbeam support assembly 33. The first vertical beam 323 and the second vertical beam 333 extend vertically, or they can extend slightly at an angle.

[0070] The onshore dual-rotor wind turbine generator set installed using the installation method disclosed in this embodiment features dual rotors. This design maximizes the power generation per unit, addressing the future market demand for large-capacity single-unit turbines and quickly doubling the power generation per unit. Furthermore, it does not increase land acquisition area or the number of foundations, thus reducing costs. Moreover, it leverages existing mature rotor technology, resulting in faster development speeds, lower costs, and higher reliability compared to future large-capacity turbines.

[0071] In the following example, taking the first auxiliary crossbeam 322 and the second auxiliary crossbeam 332 in the first specific embodiment above as both being flexible beams, a crawler crane is selected as the lifting mechanism 9, with reference to... Figures 3A to 12C This paper introduces the installation method of an onshore dual-blade wind turbine generator set according to the first embodiment of the present invention. It should be noted that, for ease of description, the direction in which the installed dual blades face is taken as the front direction, and it is also the front direction of the entire onshore dual-blade wind turbine generator set. The front sides of each component of the onshore dual-blade wind turbine generator set are on the same side as the front side of the whole.

[0072] Step 1: Position the crawler crane in front of the tower foundation 8 to lift the tower 1 and yaw mechanism 2. (Reference) Figure 3A and Figure 3B As shown, Figure 3A The diagram shows a top view of the crawler crane lifting tower 1 and yaw mechanism 2. At this time, the crawler crane is located directly in front of the center of the tower foundation 8. Since tower 1 and yaw mechanism 2 need to be positioned relative to the center of the tower foundation 8, moving the crawler crane to the front of this area for lifting facilitates meeting the lifting radius and load requirements of the crawler crane and ensures lifting stability. Figure 3BThe diagram shows a side view of the crawler crane lifting tower 1 and yaw mechanism 2. Yaw mechanism 2 is pre-installed on top of tower 1, and the crawler crane lifts both yaw mechanism 2 and tower 1 simultaneously, simplifying the lifting process. Alternatively, if the crawler crane's load-bearing capacity is insufficient, tower 1 and yaw mechanism 2 can be lifted sequentially. Tower 1 can be positioned on tower foundation 8, and yaw mechanism 2 can be positioned on top of tower 1. Positioning yaw mechanism 2 at the top of tower 1 to support the double impellers and their supporting structure facilitates the overall yaw movement of the double impellers and their supporting structure, allowing the double impellers to face the prevailing wind direction for power generation.

[0073] As an example, the yaw mechanism 2 is connected to the top of the tower 1 via a flange, and the yaw mechanism 2 is provided with a hook structure for cooperating with the hook of the crawler crane.

[0074] Step 2: Hoist and position the double impeller support assembly 3 on top of the yaw mechanism 2. Details are as follows:

[0075] Step 2.1: Hoist and position the central support structure 31 onto the top of the yaw mechanism 2. (Reference) Figure 4A and Figure 4B As shown, Figure 4A The diagram shows a top view of the crawler crane lifting the central support structure 31. At this time, the crawler crane remains stationary, directly in front of the center of the tower foundation 8, facilitating the lifting and positioning of the central support structure 31 onto the yaw mechanism 2 located above the center of the tower foundation 8. Furthermore, lifting the central support structure 31 independently allows for sufficient load-bearing capacity of the crawler crane, eliminating the need for a heavy-load crawler crane. Figure 4B A side view of the crawler crane during the lifting of the central support structure 31 is shown. The central support structure 31 is connected to the yaw mechanism 2 via a flange, ensuring a stable connection and facilitating stable support of the twin impellers.

[0076] Step 2.2: Move the tracked crane a first set distance toward the direction to be installed of the second crossbeam support assembly 33, and successively hoist the second main crossbeam 331 and the second flexible beam, and connect the first end of the second main crossbeam 331 to the central support structure 31, connect the second end of the second main crossbeam 331 to the second end of the second flexible beam, and connect the first end of the second flexible beam to the central support structure 31.

[0077] Furthermore, the first predetermined distance ranges from one-third to two-thirds of the horizontal length of the second crossbeam support assembly 33. (Reference) Figure 6A As shown, Figure 6AA top view diagram is shown of the crawler crane lifting the second crossbeam support assembly 33. At this time, the first set distance is about half the length of the second crossbeam support assembly 33. When lifting the second main crossbeam 331 and the second flexible beam in sequence, the crawler crane can also move to this area, which facilitates meeting the lifting radius of the crawler crane. It also makes it easy for the two ends of the crawler crane's lifting rope to be connected to the two ends of the second main crossbeam 331 and the two ends of the second flexible beam in sequence, ensuring the stability of the lifting.

[0078] Furthermore, the second end of the second main crossbeam 331 is positioned higher than the first end of the second flexible beam, while the second end of the second flexible beam is positioned lower than the first end of the second flexible beam. This reduces the tensile force on the second flexible beam, ensures connection stability, and facilitates the connection between the second flexible beam and the central support structure 31.

[0079] Furthermore, if the load capacity of the crawler crane is insufficient to lift the second main crossbeam 331 as a single unit, the second main crossbeam 331 can be divided into multiple segments, lifted in sections, and then spliced ​​together. For example, the third main crossbeam 3311 and the fourth main crossbeam 3312 can be lifted sequentially and connected together via flanges.

[0080] Step 2.3: Without shifting, control the yaw mechanism 2 to yaw along the second direction at a third set angle, successively hoisting the first main crossbeam 321 and the first flexible beam. Connect the first end of the first main crossbeam 321 to the central support structure 31, connect the second end of the first main crossbeam 321 to the second end of the first flexible beam, and connect the first end of the first flexible beam to the central support structure 31. By rotating the yaw mechanism 2, the part connecting the central support structure 31 and the first crossbeam support assembly 32 is brought closer to the crawler crane, while the crawler crane remains stationary. This reduces the number of times the crawler crane needs to move, saving time.

[0081] Furthermore, the third set angle ranges from 90° to 120°. (Reference) Figure 8A As shown, Figure 8A A top-view schematic diagram is shown of the crawler crane lifting the first crossbeam support assembly 32, where the direction of the curved arrow represents the rotation direction of the yaw mechanism 2. (Comparison) Figure 6A It can be seen that the yaw mechanism 2 yaws approximately 90° clockwise. When the crawler crane successively lifts the first main crossbeam 321 and the first flexible beam, the yaw mechanism 2 can also rotate 90° clockwise, ensuring that both the first main crossbeam 321 and the first flexible beam are within the lifting radius of the crawler crane, facilitating lifting. Moreover, since the first crossbeam support assembly 32 and the second crossbeam support assembly 33 have the same length, the crawler crane will also roughly correspond to half the length of the first crossbeam support assembly 32. This facilitates the connection of the two ends of the crawler crane's lifting ropes to the two ends of the first main crossbeam 321 and the two ends of the first flexible beam, ensuring lifting stability.

[0082] Furthermore, the second end of the first main crossbeam 321 is positioned higher than the first end of the first flexible beam, while the second end of the first flexible beam is lower than the first end of the first flexible beam. This reduces the tensile force on the first flexible beam, ensures connection stability, and facilitates the connection between the first flexible beam and the central support structure 31.

[0083] Furthermore, if the load capacity of the crawler crane is insufficient to lift the first main crossbeam 321 as a whole in a single operation, the first main crossbeam 321 can be divided into multiple segments, lifted in sections, and then spliced ​​together. For example, the first segment of the main crossbeam 3211 and the second segment of the main crossbeam 3212 can be lifted sequentially and connected together by flanges.

[0084] Step 3: Position the crawler crane within the rotation radius of the double impeller support assembly 3 and close to the front side of the first end of the double impeller support assembly 3. Then, hoist and position the first engine compartment 41 at the first end of the double impeller support assembly 3. Positioning the crawler crane in front of the first end of the double impeller support assembly 3 to hoist the first engine compartment 41 facilitates installation and positioning of the first engine compartment 41 facing forward, making installation more convenient and faster compared to installing the first engine compartment 41 from the reverse direction.

[0085] Furthermore, if the third set angle in step 2.3 above is greater than or equal to 90° and less than or equal to 110°, the crawler crane can remain stationary. The yaw mechanism 2 is controlled to continue yawing 20° to 30° in the second direction, so that the crawler crane approaches the first end of the double impeller support assembly 3. The sum of the fourth and third set angles ranges from 110° to 120°. This eliminates the need for the crawler crane to move, saving installation time. Figure 9A This diagram shows a top view of the crawler crane lifting the first engine compartment 41, for comparison. Figure 9A and Figure 8A It can be seen that after the yaw mechanism 2 continues to yaw 20° to 30° in the second direction, the crawler crane can approach the front side of the first end of the double impeller support assembly 3. Figure 9B This diagram shows a side view of the crawler crane during the lifting of the first engine compartment 41. Figure 9C A side view of the crawler crane is shown when it is lifting the first generator 42. Specifically, the crawler crane lifts and positions the first nacelle 41 on the first mounting platform at the first end of the double impeller support assembly 3, and then lifts and positions the first generator 42 on the first nacelle 41.

[0086] Alternatively, if the third set angle in step 2.3 above is greater than or equal to 110° and less than or equal to 120°, then in step 2.3 above, the crawler crane will also approach the front side of the first end of the double impeller support assembly 3, and the crawler crane will successively lift the first main crossbeam 321 and the first flexible beam at this position. In step 3, there is no need to control the rotation of the yaw mechanism 2, the yaw mechanism 2 remains stationary, and there is no need to move the crawler crane, so the first engine room 41 and the first generator 42 can be lifted directly.

[0087] Alternatively, to allow the crawler crane to get closer to the front of the first end of the double impeller support assembly 3, the crawler crane can be moved directly to the front of the first end of the double impeller support assembly 3.

[0088] Step 4: Control the yaw mechanism 2 to yaw along the first direction at a first set angle, so that the crawler crane approaches the front side of the second end of the double impeller support assembly 3, and hoist and position the second engine compartment 51 at the second end of the double impeller support assembly 3.

[0089] Further, control the yaw mechanism 2 to return to its initial position, that is, the position of the yaw mechanism 2 before step 2.3. For example, control the yaw mechanism 2 to rotate 110° to 120° in the first direction. At this time, the crawler crane is close to the front side of the second end of the double impeller support assembly 3. Of course, to make it easier for the crawler crane to lift the second engine compartment 51, the crawler crane can be moved to directly in front of the second end of the double impeller support assembly 3. (Reference) Figure 10A As shown, Figure 10A The diagram shows that after the yaw mechanism 2 is reset, the crawler crane is located directly in front of the second end of the double impeller support assembly 3, which facilitates forward hoisting of the second engine room 51 and the second generator 52, making assembly convenient. Figure 10B This diagram shows a side view of the crawler crane lifting the second engine compartment 51. Figure 10C A side view of the crawler crane hoisting the second generator 52 is shown. Specifically, the crawler crane hoists and positions the second nacelle 51 on the second mounting platform at the second end of the double impeller support assembly 3, and then hoists and positions the second generator 52 on the second nacelle 51.

[0090] Step 5: Hoist and position the second impeller 7 onto the second nacelle 51, ensuring the second impeller 7 faces the front of the tower foundation 8. Specifically, refer to... Figure 11A As shown, the second impeller 7 can be assembled on the ground first, and then refer to... Figure 11B As shown, the second impeller 7 is hoisted forward on the front side of the second end of the double impeller support assembly 3, the second impeller 7 is positioned on the second nacelle 51, and connected to the second generator 52. Figure 11C A side view of the crawler crane hoisting the second impeller 7 is shown.

[0091] Step 6: Without shifting the crawler crane, control the yaw mechanism 2 to yaw along a second direction opposite to the first direction by a second set angle, so that the crawler crane approaches the front side of the first end of the double impeller support assembly 3, and hoists and positions the first impeller 6 on the first nacelle 41, with the first impeller 6 facing the front side of the tower foundation 8. This reduces the number of times the crawler crane needs to move and facilitates the forward assembly of the first impeller 6, making installation convenient. Specifically, refer to... Figure 12A As shown, the first impeller 6 can be assembled on the ground first, and then refer to... Figure 12BAs shown, the yaw mechanism 2 is controlled to yaw 130° to 140° in the second direction, so that the crawler crane is close to the front side of the first end of the double impeller support assembly 3, and the first impeller 6 is positioned on the first nacelle 41 and connected to the first generator 42. Figure 12C A side view of the crawler crane hoisting the first impeller 6 is shown.

[0092] The above steps complete the installation of an onshore dual-rotor wind turbine generator set. First, the crawler crane is positioned in front of the tower foundation 8. Then, the crawler crane is moved to the front of the first end of the dual-rotor support assembly 3. With the coordination of the yaw mechanism 2, the front of the second end and the front of the first end of the dual-rotor support assembly 3 are brought closer to the crawler crane for lifting. This effectively reduces the number of times the crawler crane needs to move, and may even require only one movement, improving assembly efficiency. Furthermore, positioning the crawler crane within the rotation radius of the dual-rotor support assembly 3 allows for better frontal contact with the first and second ends of the assembly, facilitating the frontal installation and positioning of the first nacelle 41, the second nacelle 51, the first impeller 6, and the second impeller 7, thus simplifying installation.

[0093] Of course, in the second embodiment, regarding step 2: hoisting and positioning the double impeller support assembly 3 on top of the yaw mechanism 2, the double impeller support assembly 3 can be pre-assembled on the ground. The first crossbeam support assembly 32 is connected to the first side of the central support structure 31 on the ground, and the second crossbeam support assembly 33 is connected to the second side of the central support structure 31. Specifically, the central support structure 31, the first main crossbeam 321, the first flexible beam, the second main crossbeam 331, and the second flexible beam are assembled together. Then, without shifting, the crawler crane directly hoists the double impeller support assembly 3 on the front side of the tower foundation 8. Specifically, refer to... Figures 13 to 15 As shown, Figure 13 The diagram shows the structure of the crawler crane assembling the central support structure 31, the second main crossbeam 331, and the second flexible beam on the ground. Assembly tools need to be set up in advance at the bottom of the central support structure 31. The central support structure 31 is first fixed on the ground, and then the second main crossbeam 331 and the second flexible beam are hoisted in sequence. Figure 14 The diagram shows a schematic of the structure of the crawler crane continuing to assemble the first main crossbeam 321 and the first flexible beam on the ground. Figure 15 A schematic diagram of the structure of the crawler crane hoisting the double impeller support assembly 3 is shown. At this time, a hoisting structure needs to be set on the top of the central support structure 31 so that the crawler crane can hook the hoisting structure to hoist the central support structure 31, the first crossbeam support assembly 32 and the second crossbeam support assembly 33 as a whole, and position the central support structure 31 on the top of the yaw mechanism 2.

[0094] In this embodiment, step 3, positioning the crawler crane within the rotation radius of the double impeller support assembly 3 and close to the front side of the first end of the double impeller support assembly 3, includes: positioning the crawler crane within the rotation radius of the double impeller support assembly 3 and moving the crawler crane to directly in front of the first end of the double impeller support assembly 3. The crawler crane can be moved directly from directly in front of the tower foundation 8 to directly in front of the first end of the double impeller support assembly 3, requiring only one movement, thus improving assembly efficiency.

[0095] In this embodiment, in step 4, the first set angle ranges from 130° to 140°. Ensure the crawler crane is close to the front side of the second end of the twin impeller support assembly 3.

[0096] In this embodiment, in step 6, the value range of the second set angle is 130° to 140°. Ensure the crawler crane is close to the front side of the first end of the twin impeller support assembly 3.

[0097] The remaining steps can be the same as the hoisting method for the onshore dual-rotor wind turbine generator set in the first embodiment described above.

[0098] Regarding the hoisting method of the onshore dual-blade wind turbine generator set in the second specific embodiment above, since the first auxiliary crossbeam 322 and the second auxiliary crossbeam 332 are rigid beams, in step 2, the hoisting steps can be referred to when using the first flexible beam and the second flexible beam. The first auxiliary crossbeam 322 replaces the first flexible beam, and the second auxiliary crossbeam 332 replaces the second flexible beam. The remaining steps can be the same as the hoisting method of the onshore dual-blade wind turbine generator set in the first or second embodiment above.

[0099] Of course, in another embodiment, step 2.2 is: assembling the second crossbeam support assembly 33 on the ground. (Refer to...) Figure 5 As shown, the crawler crane does not need to be moved; it can be used to lift the various parts of the second crossbeam support assembly 33 together. For example, the second main crossbeam 331 and the second auxiliary crossbeam 332 can be assembled together, or the second main crossbeam 331, the second auxiliary crossbeam 332, and the second vertical beam 333 can be assembled together. This facilitates the subsequent overall lifting of the second crossbeam support assembly 33, thereby reducing the number of lifting operations.

[0100] Step 2.2 further includes: after moving the crawler crane a first predetermined distance toward the installation direction of the second crossbeam support assembly 33, hoisting and positioning the second crossbeam support assembly 33 on the second side of the central support structure 31. (Refer to...) Figure 6A and Figure 6B As shown, Figure 6A This diagram shows a top view of the crawler crane lifting the second crossbeam support assembly 33. Figure 6BA side view of the crawler crane lifting the second crossbeam support assembly 33 is shown. At this time, the first set distance is approximately half the length of the second crossbeam support assembly 33, which facilitates meeting the lifting radius of the crawler crane and allows the two ends of the crawler crane's lifting ropes to be connected to the two ends of the second crossbeam support assembly 33, ensuring lifting stability.

[0101] In this embodiment, step 2.3: Assemble the first crossbeam support assembly 32 on the ground. (Refer to...) Figure 7 As shown, the crawler crane does not shift position and can be used to lift the various parts of the first crossbeam support assembly 32 together. For example, the first main crossbeam 321 and the first auxiliary crossbeam 322 can be assembled together, or the first main crossbeam 321, the first auxiliary crossbeam 322, and the first vertical beam 323 can be assembled together. This facilitates the subsequent overall lifting of the first crossbeam support assembly 32, thereby reducing the number of lifting operations.

[0102] Step 2.3 further includes: without shifting the crawler crane, controlling the yaw mechanism 2 to yaw along the second direction by a third set angle, thereby hoisting and positioning the first crossbeam support assembly 32 to the first side of the central support structure 31. By rotating the yaw mechanism 2 to bring the part connecting the central support structure 31 and the first crossbeam support assembly 32 closer to the crawler crane, while the crawler crane remains stationary, the number of times the crawler crane needs to move is reduced, saving time.

[0103] Furthermore, the third set angle ranges from 90° to 120°. (Reference) Figure 8A As shown, Figure 8A A top-view schematic diagram is shown of the crawler crane lifting the first crossbeam support assembly 32, where the direction of the curved arrow represents the rotation direction of the yaw mechanism 2. (Comparison) Figure 6A It can be seen that the yaw mechanism 2 yaws clockwise by approximately 90°. At this point, the first crossbeam support assembly 32 is within the lifting radius of the crawler crane, facilitating lifting. Moreover, the crawler crane is approximately positioned at half the length of the first crossbeam support assembly 32, thus facilitating the connection of the two ends of the crawler crane's lifting ropes to the two ends of the first crossbeam support assembly 32, ensuring lifting stability. Figure 8B A side view of the crawler crane is shown when it is lifting the first crossbeam support assembly 32.

[0104] The remaining steps can be the same as the hoisting method for the onshore dual-rotor wind turbine generator set in the first embodiment described above.

[0105] In another embodiment, if the load capacity of the crawler crane is insufficient to lift the first main crossbeam 321, the first auxiliary crossbeam 322, the second main crossbeam 331, and the second auxiliary crossbeam 332 as a single unit, the first main crossbeam 321, the first auxiliary crossbeam 322, the second main crossbeam 331, and the second auxiliary crossbeam 332 can be divided into multiple segments, lifted in sections, and then spliced ​​together. Referring to the lifting method of the onshore dual-blade wind turbine generator set in the first embodiment above, in step 2, the third main crossbeam 3311, the fourth main crossbeam 3312, the fourth auxiliary crossbeam 3322, the third auxiliary crossbeam 3321, the second vertical beam 333, the first main crossbeam 3211, the second main crossbeam 3212, the second auxiliary crossbeam 3222, the first auxiliary crossbeam 3221, and the first vertical beam 323 are lifted sequentially.

[0106] Specifically, during the hoisting of the first main crossbeam 321, the first section of the main crossbeam 3211 is hoisted first and connected to one side of the central support structure 31 via a flange. Then, the second section of the main crossbeam 3212 is hoisted and connected to the first section of the main crossbeam 3211 via a flange.

[0107] During the hoisting of the first auxiliary crossbeam 322, the second auxiliary crossbeam 3222 is hoisted first and connected to the second main crossbeam 3212 via a flange. Then, the first auxiliary crossbeam 3221 is hoisted and one end of the first auxiliary crossbeam 3221 is connected to the second auxiliary crossbeam 3222 via a flange, and the other end of the first auxiliary crossbeam 3221 is connected to the central support structure 31 via a flange.

[0108] During the hoisting of the second main crossbeam 331, the third main crossbeam 3311 is hoisted first and connected to one side of the central support structure 31 via a flange. Then the fourth main crossbeam 3312 is hoisted and connected to the third main crossbeam 3311 via a flange.

[0109] During the hoisting of the second auxiliary crossbeam 332, the fourth auxiliary crossbeam 3322 is hoisted first and connected to the fourth main crossbeam 3312 via a flange. Then, the third auxiliary crossbeam 3321 is hoisted and one end of the third auxiliary crossbeam 3321 is connected to the fourth auxiliary crossbeam 3322 via a flange. The other end of the third auxiliary crossbeam 3321 is connected to the central support structure 31 via a flange.

[0110] After the steps of hoisting the first main crossbeam 321 and the first auxiliary crossbeam 322, the process also includes hoisting the first vertical beam 323 and connecting the two ends of the first vertical beam 323 to the first main crossbeam 3211 and the first auxiliary crossbeam 3221, respectively.

[0111] After the steps of hoisting the second main crossbeam 331 and the second auxiliary crossbeam 332, the process also includes hoisting the second vertical beam 333 and connecting the two ends of the second vertical beam 333 to the third main crossbeam 3311 and the third auxiliary crossbeam 3321, respectively.

[0112] The remaining steps can be the same as the hoisting method for the onshore dual-rotor wind turbine generator set in the first embodiment described above.

[0113] While embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the invention. It should be understood that, to those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention as defined in the claims.

Claims

1. A method for installing an onshore dual-blade wind turbine generator set, characterized in that, The installation method includes: The hoisting mechanism (9) is positioned in front of the tower foundation (8) to hoist the tower (1) and the yaw mechanism (2); The double impeller support assembly (3) is hoisted and positioned on top of the yaw mechanism (2); Position the hoisting mechanism (9) within the rotation radius of the double impeller support assembly (3) and close to the front side of the first end of the double impeller support assembly (3) to hoist and position the first nacelle (41) at the first end of the double impeller support assembly (3); Control the yaw mechanism (2) to yaw at a first set angle in the first direction, so that the hoisting mechanism (9) is close to the front side of the second end of the double impeller support assembly (3), and the second nacelle (51) is hoisted and positioned at the second end of the double impeller support assembly (3); The second impeller (7) is hoisted and positioned on the second nacelle (51); Under the condition that the hoisting mechanism (9) does not shift, the yaw mechanism (2) is controlled to yaw at a second set angle in a second direction opposite to the first direction, so that the hoisting mechanism (9) is close to the front side of the first end of the double impeller support assembly (3), and the first impeller (6) is hoisted and positioned on the first nacelle (41). The step of hoisting and positioning the double impeller support assembly (3) on top of the yaw mechanism (2) includes: hoisting and positioning the central support structure (31) on top of the yaw mechanism (2); assembling the second crossbeam support assembly (33) on the ground; moving the hoisting mechanism (9) a first set distance toward the installation direction of the second crossbeam support assembly (33), and then hoisting and positioning the second crossbeam support assembly (33) on the second side of the central support structure (31); assembling the first crossbeam support assembly (32) on the ground; and, without shifting the hoisting mechanism (9), controlling the yaw mechanism (2) to yaw along the second direction by a third set angle, and hoisting and positioning the first crossbeam support assembly (32) on the first side of the central support structure (31); or The step of hoisting and positioning the double impeller support assembly (3) on the top of the yaw mechanism (2) includes: connecting the first crossbeam support assembly (32) to the first side of the central support structure (31) on the ground, and connecting the second crossbeam support assembly (33) to the second side of the central support structure (31); setting a hoisting structure on the top of the central support structure (31), so that the hoisting mechanism (9) hooks the hoisting structure to hoist the central support structure (31), the first crossbeam support assembly (32) and the second crossbeam support assembly (33) as a whole, and positioning the central support structure (31) on the top of the yaw mechanism (2); or The double impeller support assembly (3) includes a central support structure (31), a first crossbeam support assembly (32) distributed on the first side of the central support structure (31), and a second crossbeam support assembly (33) distributed on the second side of the central support structure (31). The first crossbeam support assembly (32) includes a first main crossbeam (321) and a first auxiliary crossbeam (322). The second crossbeam support assembly (33) includes a second main crossbeam (331) and a second auxiliary crossbeam (332). The step of hoisting and positioning the double impeller support assembly (3) on the top of the yaw mechanism (2) includes: hoisting and positioning the central support structure (31) on the top of the yaw mechanism (2); moving the hoisting mechanism (9) a first set distance toward the installation direction of the second crossbeam support assembly (33), and hoisting the second main crossbeam (331) and the second auxiliary crossbeam (332) in sequence. The second auxiliary crossbeam (332) is connected to the first end of the second main crossbeam (331) and the center support structure (31). The second end of the second main crossbeam (331) is connected to the second end of the second auxiliary crossbeam (332), and the first end of the second auxiliary crossbeam (332) is connected to the center support structure (31). Under the condition that the hoisting mechanism (9) does not shift, the yaw mechanism (2) is controlled to yaw at a third set angle in the second direction, and the first main crossbeam (321) and the first auxiliary crossbeam (322) are hoisted in sequence. The first end of the first main crossbeam (321) is connected to the center support structure (31), the second end of the first main crossbeam (321) is connected to the second end of the first auxiliary crossbeam (322), and the first end of the first auxiliary crossbeam (322) is connected to the center support structure (31).

2. The installation method of the onshore dual-blade wind turbine generator set according to claim 1, characterized in that, The first set distance is between one-third and two-thirds of the length of the second beam support assembly (33) in the horizontal direction, and the third set angle is between 90° and 120°.

3. The installation method of the onshore dual-blade wind turbine generator set according to claim 2, characterized in that, The first set distance is half the length of the second crossbeam support assembly (33) in the horizontal direction, and the third set angle is 90°.

4. The installation method of the onshore dual-blade wind turbine generator set according to claim 2, characterized in that, The step of positioning the hoisting mechanism (9) within the rotation radius of the double impeller support assembly (3) and close to the front side of the first end of the double impeller support assembly (3) includes: Based on the condition that the third set angle is greater than or equal to 90° and less than 110°, under the condition that the hoisting mechanism (9) does not shift, the yaw mechanism (2) is controlled to continue to yaw along the second direction by a fourth set angle so that the hoisting mechanism (9) is close to the first end of the double impeller support assembly (3), wherein the sum of the fourth set angle and the third set angle is in the range of 110° to 120°; Based on the condition that the third set angle is greater than or equal to 110° and less than or equal to 120°, the yaw mechanism (2) remains stationary and the hoisting mechanism (9) does not shift to directly hoist the first cabin (41).

5. The installation method of the onshore dual-blade wind turbine generator set according to claim 4, characterized in that, The step of controlling the yaw mechanism (2) to yaw along the first direction by a first set angle, so that the hoisting mechanism (9) approaches the front side of the second end of the double impeller support assembly (3) includes: Control the yaw mechanism (2) to reset; Move the hoisting mechanism (9) to the front of the second end of the double impeller support assembly (3).

6. The installation method of the onshore dual-blade wind turbine generator set according to claim 5, characterized in that, The second set angle ranges from 130° to 140°.

7. The installation method of the onshore dual-blade wind turbine generator set according to claim 1, characterized in that, The step of placing the hoisting mechanism (9) within the rotation radius of the double impeller support assembly (3) and close to the front side of the first end of the double impeller support assembly (3) includes: placing the hoisting mechanism (9) within the rotation radius of the double impeller support assembly (3) and moving the hoisting mechanism (9) to the front of the first end of the double impeller support assembly (3); The first set angle ranges from 130° to 140°; The second set angle ranges from 130° to 140°.

8. The installation method of the onshore dual-blade wind turbine generator set according to claim 1, characterized in that, The first crossbeam support assembly (32) includes a first main crossbeam (321) and a first auxiliary crossbeam (322). The first end of the first main crossbeam (321) is connected to the central support structure (31) through a flange. The second end of the first main crossbeam (321) and the second end of the first auxiliary crossbeam (322) are connected through a flange. The first end of the first auxiliary crossbeam (322) is connected to the central support structure (31) through a flange. The second crossbeam support assembly (33) includes a second main crossbeam (331) and a second auxiliary crossbeam (332). The first end of the second main crossbeam (331) is connected to the central support structure (31) via a flange. The second end of the second main crossbeam (331) and the second end of the second auxiliary crossbeam (332) are connected via a flange. The first end of the second auxiliary crossbeam (332) is connected to the central support structure (31) via a flange. Wherein, the second end of the first main beam (321) is higher than the first end of the first main beam (321), the second end of the first auxiliary beam (322) is lower than the first end of the first auxiliary beam (322), the cross-sectional area of ​​the first main beam (321) is greater than the cross-sectional area of ​​the first auxiliary beam (322), the second end of the second main beam (331) is higher than the second end of the second main beam (331), the second end of the second auxiliary beam (332) is lower than the first end of the second auxiliary beam (332), and the cross-sectional area of ​​the second main beam (331) is greater than the cross-sectional area of ​​the second auxiliary beam (332).

9. The installation method of the onshore dual-blade wind turbine generator set according to claim 8, characterized in that, Both the first auxiliary crossbeam (322) and the second auxiliary crossbeam (332) are rigid beams or both are flexible beams; Since both the first auxiliary crossbeam (322) and the second auxiliary crossbeam (332) are rigid beams, the first crossbeam support assembly (32) also includes a first vertical beam (323), which connects the first main crossbeam (321) and the first auxiliary crossbeam (322) via a flange. The second crossbeam support assembly (33) also includes a second vertical beam (333), which connects the second main crossbeam (331) and the second auxiliary crossbeam (332) via a flange.

10. The installation method of the onshore dual-blade wind turbine generator set according to claim 1, characterized in that, Both the first auxiliary crossbeam (322) and the second auxiliary crossbeam (332) are rigid beams. The first crossbeam support assembly (32) also includes a first vertical beam (323), which connects the first main crossbeam (321) and the first auxiliary crossbeam (322) through a flange. The second crossbeam support assembly (33) also includes a second vertical beam (333), which connects the second main crossbeam (331) and the second auxiliary crossbeam (332) through a flange.

11. The installation method of the onshore dual-blade wind turbine generator set according to claim 10, characterized in that, The first main crossbeam (321) includes a first main crossbeam (3211) and a second main crossbeam (3212), the first auxiliary crossbeam (322) includes a first auxiliary crossbeam (3221) and a second auxiliary crossbeam (3222), the second main crossbeam (331) includes a third main crossbeam (3311) and a fourth main crossbeam (3312), and the second auxiliary crossbeam (332) includes a third auxiliary crossbeam (3321) and a fourth auxiliary crossbeam (3322). During the hoisting of the first main crossbeam (321), the first section of the main crossbeam (3211) is hoisted first and the first section of the main crossbeam (3211) is connected to one side of the central support structure (31) through a flange. Then the second section of the main crossbeam (3212) is hoisted and the first section of the main crossbeam (3211) is connected through a flange. During the hoisting of the first auxiliary crossbeam (322), the second auxiliary crossbeam (3222) is hoisted first and connected to the second main crossbeam (3212) through a flange. Then, the first auxiliary crossbeam (3221) is hoisted and one end of the first auxiliary crossbeam (3221) is connected to the second auxiliary crossbeam (3222) through a flange. The other end of the first auxiliary crossbeam (3221) is connected to the central support structure (31) through a flange. During the hoisting of the second main crossbeam (331), the third main crossbeam (3311) is hoisted first and the third main crossbeam (3311) is connected to one side of the central support structure (31) through a flange. Then the fourth main crossbeam (3312) is hoisted and the third main crossbeam (3311) is connected through a flange. During the hoisting of the second auxiliary crossbeam (332), the fourth auxiliary crossbeam (3322) is hoisted first and connected to the fourth main crossbeam (3312) through a flange. Then, the third auxiliary crossbeam (3321) is hoisted and one end of the third auxiliary crossbeam (3321) is connected to the fourth auxiliary crossbeam (3322) through a flange. The other end of the third auxiliary crossbeam (3321) is connected to the central support structure (31) through a flange. After the steps of hoisting the first main crossbeam (321) and the first auxiliary crossbeam (322) in sequence, the method further includes hoisting the first vertical beam (323) and connecting the two ends of the first vertical beam (323) to the first section of the main crossbeam (3211) and the first section of the auxiliary crossbeam (3221) respectively. After the steps of hoisting the second main crossbeam (331) and the second auxiliary crossbeam (332) in sequence, the second vertical beam (333) is also hoisted, and the two ends of the second vertical beam (333) are respectively connected to the third main crossbeam (3311) and the third auxiliary crossbeam (3321).

12. The installation method of the onshore dual-blade wind turbine generator set according to claim 1, characterized in that, A crawler crane was selected as the lifting mechanism (9).

Images