Blade mounting method and disassembly method for wind turbine

Abstract

Provided in the present disclosure are a blade mounting method and disassembly method for a wind turbine. The mounting method comprises: arranging a first fixed pulley in a hub of a wind turbine; connecting a suspension structure to a pitch bearing mounted on a blade; turning a suspension rope wound on a winch by means of the first fixed pulley and then connecting same to the suspension structure; and starting the winch, and using the suspension rope to hoist the pitch bearing and the blade together to a tower. The present disclosure can avoid large cranes, and has good safety.

Description

Installation and disassembly methods for wind turbine blades

[0001] This disclosure claims priority to the earlier application entitled "Installation and Disassembly Method for Wind Turbine Generator Blades", application number 202510185865.8, filed on February 19, 2025. Technical Field

[0002] This disclosure relates to the field of wind power generation, specifically to a method for installing and disassembling the blades of a wind turbine generator set. Background Technology

[0003] Currently, wind turbine blades are developing towards ultra-long and flexible designs. However, with the increase in blade length, the difficulty and cost of hoisting and installation increase. Furthermore, as the turbine operates, various problems arise with the blades, necessitating the replacement of damaged blades to ensure normal turbine operation. Moreover, as the blade weight increases, pitch bearing cracking becomes a frequent issue. Existing blade replacement methods require the use of large cranes to remove the entire rotor from the tower, hoist it to the ground, and then lift and install the new blade, resulting in high costs. Summary of the Invention

[0004] Therefore, the purpose of this disclosure is to provide a method for installing and removing blades of a wind turbine generator set, which can simply lift the pitch bearing and blades to the ground and to the hub for installation, without using large lifting equipment, thus reducing replacement costs.

[0005] The first aspect of this disclosure provides a method for installing blades of a wind turbine generator set. The method includes: arranging a first fixed pulley inside the hub of the wind turbine generator set; connecting a suspension structure to a pitch bearing installed on the blade; connecting a hoisting rope wound on a winch to the suspension structure after being turned by the first fixed pulley; starting the winch and using the hoisting rope to simultaneously hoist the pitch bearing and the blade onto the tower.

[0006] A second aspect of this disclosure provides a method for disassembling the blades of a wind turbine generator set. The disassembly method includes: arranging a first fixed pulley inside the hub of the wind turbine generator set; connecting a suspension structure to a pitch bearing mounted on the blade; connecting a hoisting rope wound on a winch to the suspension structure after being turned by the first fixed pulley; separating the pitch bearing from the hub of the wind turbine generator set; starting the winch; and using the hoisting rope to simultaneously lift the pitch bearing and the blade down from the tower.

[0007] The method for installing wind turbine blades disclosed herein uses a winch and pulleys to simultaneously lift the pitch bearing and the blades connected to the pitch bearing onto the tower. Compared with related technologies that use large cranes to lift the rotor as a whole, this method eliminates the need for large cranes, avoids the rental costs of large cranes, saves installation costs, and greatly reduces the lifting weight, thus improving safety.

[0008] The method for dismantling the blades of the wind turbine generator provided in this disclosure also uses a winch and pulley to simultaneously lift the pitch bearing and the blades connected to the pitch bearing down the tower. Compared with the related technology that uses a large crane to lift the rotor as a whole down the tower, this method can eliminate the need for a large crane, eliminate the rental cost of a large crane, save dismantling costs, and greatly reduce the lifting weight, thus improving safety.

[0009] Further aspects and / or advantages of the general concept of this disclosure will be set forth in part in the description which follows, and in part will be clear from the description or may be learned by practice of the general concept of this disclosure. Attached Figure Description

[0010] The above and other objects and features of this disclosure will become clearer from the following description of embodiments taken in conjunction with the accompanying drawings, in which:

[0011] Figure 1 shows a schematic diagram of the pitch bearing and blades of an embodiment of the present disclosure as they are about to be lowered.

[0012] Figure 2 shows a partial structural schematic diagram of a pitch bearing and blade of an embodiment of the present disclosure as they are about to be lowered.

[0013] Figure 3 shows an assembly schematic diagram of the first fixed pulley according to an embodiment of the present disclosure;

[0014] Figure 4 shows an assembly schematic diagram of the fifth fixed pulley according to an embodiment of the present disclosure;

[0015] Figure 5 shows a first structural schematic diagram of the connection process between the suspension structure and the pitch bearing according to an embodiment of the present disclosure;

[0016] Figure 6 shows a second structural schematic diagram of the suspension structure and pitch bearing in the connection process of an embodiment of the present disclosure;

[0017] Figure 7 shows a third structural schematic diagram of the suspension structure and pitch bearing in the connection process of an embodiment of the present disclosure;

[0018] Figure 8 shows a fourth structural schematic diagram of the connection process between the suspension structure and the pitch bearing according to an embodiment of the present disclosure;

[0019] Figure 9 shows a fifth structural schematic diagram of the connection process between the suspension structure and the pitch bearing according to an embodiment of the present disclosure;

[0020] Figure 10 shows a sixth structural schematic diagram of the connection process between the suspension structure and the pitch bearing according to an embodiment of the present disclosure;

[0021] Figure 11 shows a schematic diagram of the structure of a pitch bearing and blade according to an embodiment of the present disclosure during the initial hoisting and lowering of the tower;

[0022] Figure 12 shows a schematic diagram of the structure of a pitch bearing and blade according to an embodiment of the present disclosure during the hoisting and lowering process from the tower.

[0023] Explanation of the reference numerals in Figures 1 to 12:

[0024] 100 Tower; 200 Main shaft; 300 Hub; 310 Second bolt hole; 400 Pitch bearing; 410 First bolt hole; 420 Working space; 500 Blades; 600 Lifting rope;

[0025] 700 Pulley block; 710 Fourth fixed pulley; 720 Third fixed pulley; 730 First fixed pulley; 740 Fifth fixed pulley; 750 First movable pulley; 760 Second fixed pulley; 701 Clamp; 702 Set screw;

[0026] 800 Suspension structure; 801 Limit bolt; 802 Lifting mechanism; 8021 Tie rod; 8022 Hollow jack; 8023 Second fixing nut; 803 Limiting pad; 804 Vane brake structure; 805 Guide rod; 806 Suspension mounting bolt;

[0027] 900 blade clamp; 910 clamp lifting rope. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] The directional terms “above,” “below,” “top,” and “bottom” used in this application, unless otherwise specified, are based on the orientation of the product when it is in normal use.

[0035] 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 disclosure pertains upon understanding this disclosure. 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 disclosure, and shall not be interpreted in an idealized or overly formalistic manner.

[0036] The following describes the installation and disassembly methods of the blades 500 of the wind turbine generator provided in the embodiments of this disclosure, with reference to Figures 1 to 12.

[0037] As shown in Figures 1 and 2, a first aspect of this disclosure provides a method for installing a blade 500 of a wind turbine generator set. The installation method includes: arranging a first fixed pulley 730 inside the hub 300 of the wind turbine generator set; connecting a suspension structure 800 to a pitch bearing 400 installed on the blade 500; connecting a hoisting rope 600 wound on a winch to the suspension structure 800 after being turned by the first fixed pulley 730; starting the winch and using the hoisting rope 600 to simultaneously hoist the pitch bearing 400 and the blade 500 onto the tower.

[0038] The method for installing the blade 500 of the wind turbine provided in this disclosure connects the suspension structure 800 to the pitch bearing 400, and connects the hoisting rope 600 on the winch to the suspension structure 800 after being turned by the first fixed pulley 730. The winch is used to hoist the pitch bearing 400 and the blade 500 connected to the pitch bearing 400 onto the tower simultaneously. Compared with the use of a large crane to lift the rotor as a whole in related technologies, this method can eliminate the need for a large crane, eliminate the rental cost of a large crane, save installation costs, and greatly reduce the lifting weight, thus improving safety.

[0039] Especially for mountainous projects, the entry of large cranes is difficult, potentially requiring road construction or land acquisition, which can lead to prolonged downtime of wind turbines and significant power generation losses. Furthermore, the cost of bringing in large cranes is high, and other costs such as land acquisition may also be involved, resulting in excessively high overall installation costs. In this embodiment, the existing structure of the wind turbine is utilized with installation pulleys, and a winch is used in conjunction with the pulleys. This eliminates the need for a large crane to install the blades 500 and pitch bearing 400, significantly reducing installation costs. It also allows for rapid on-site access, minimizing economic losses due to prolonged turbine downtime, and solves the problems of long installation cycles and high costs associated with the installation of the pitch bearing 400 and blades 500 in related technologies.

[0040] The first fixed pulley 730 is arranged inside the hub 300 to facilitate guiding the hoisting rope 600 to the port where the hub 300 connects to the pitch bearing 400, thereby facilitating the connection between the hoisting rope 600 and the suspension structure 800.

[0041] During the installation process, the hub 300 can be rotated first so that the port connecting the hub 300 and the pitch bearing 400 faces downward. This makes it easier to connect the pitch bearing 400 and the blade 500 after hoisting them upward.

[0042] As an example, as shown in Figure 2, the step of arranging the first fixed pulley 730 inside the hub 300 of the wind turbine generator set includes: arranging the first fixed pulley 730 on the end face of the main shaft 200 of the wind turbine generator set that extends into the hub 300.

[0043] In this example, placing the first fixed pulley 730 on the main shaft 200, compared to placing it on the hub 300, does not affect the structure of the hub 300, and prevents damage to the hub 300 due to excessive weight during hoisting. Furthermore, placing the first fixed pulley 730 on the end face of the main shaft 200 that extends into the hub 300 (assuming the wind turbine's main shaft 200 extends into the hub 300) allows for direct installation of the first fixed pulley 730 without altering the main shaft's structure. This simplifies the manufacturing process and reduces costs. Moreover, the weight of the main shaft 200 will fall onto the tower 100. The first fixed pulley 730 is arranged on the main shaft 200. During the hoisting process, the weight borne by the first fixed pulley 730 can be transferred to the tower 100 through the main shaft 200, resulting in good hoisting stability and high reliability.

[0044] Of course, in other examples, the first fixed pulley 730 may also be arranged on other parts in the hub 300, not limited to the examples described above.

[0045] According to an embodiment of this disclosure, further as shown in Figures 1 and 2, the installation method further includes: arranging a first movable pulley 750 on the suspension structure 800; the step of connecting the hoisting rope 600 wound on the winch to the suspension structure 800 after turning it through the first fixed pulley 730 includes: turning the hoisting rope 600 through the first fixed pulley 730, passing it from below through the first movable pulley 750 and turning it again, and connecting the end of the hoisting rope 600 to the fixed structure of the wind turbine generator set.

[0046] Here, the hoisting rope 600 passes sequentially through the first fixed pulley 730 and the first movable pulley 750. The design of the first movable pulley 750 reduces the pulling force required by the winch for hoisting, facilitating hoisting and saving energy. Moreover, placing the first movable pulley 750 on the suspension structure 800 will not affect the surrounding structure and is easy to install.

[0047] As an example, as shown in Figure 2, the step of connecting the end of the lifting rope 600 to the fixed structure of the wind turbine generator includes: fixing the end of the lifting rope 600 to the main shaft 200 of the wind turbine generator. Since the weight of the main shaft 200 will fall onto the tower 100, connecting the end of the lifting rope 600 to the main shaft 200 allows part of the weight of the pitch bearing 400 and blades 500 to be transferred to the tower 100 via the lifting rope 600 and the main shaft 200 during hoisting, resulting in good hoisting stability and high reliability.

[0048] As shown in Figure 2, the end of the suspension rope 600 is fixed to the lower surface of the main shaft 200.

[0049] Of course, in other examples, the end of the sling 600 may also be fixed to a base at the bottom of the cabin cover, etc., and is not limited to the examples described above.

[0050] According to an embodiment of this disclosure, further as shown in Figures 1 and 2, the installation method further includes: arranging a second fixed pulley 760 inside the hub 300; and connecting the hoisting rope 600 wound on the winch to the suspension structure 800 after turning it through the first fixed pulley 730. The method further includes: turning the hoisting rope 600 from below through the first movable pulley 750, then from above through the second fixed pulley 760, and then from below again through the first movable pulley 750; after the hoisting rope 600 is wound around the second fixed pulley 760 and the first movable pulley 750 at least once, connecting the end of the hoisting rope 600 to the fixed structure.

[0051] Here, after the lifting rope 600 is wound around the second fixed pulley 760 and the first movable pulley 750 at least once, the end of the lifting rope 600 is fixed to the fixed structure, which can further reduce the pulling force required for hoisting by the winch, facilitate hoisting, and save energy.

[0052] For example, when the hoisting rope 600 is wound around the second fixed pulley 760 and the first movable pulley 750 once, as shown in Figure 2, the weight of the pitch bearing 400 and the blade 500 connected to the pitch bearing 400 will be shared by the four sections of the hoisting rope 600 in Figure 2. In this way, the winch can lift the pitch bearing 400 and the blade 500 by applying only one-quarter of their weight, without the winch bearing a large weight. This can improve the service life of the winch and enhance the safety of hoisting.

[0053] For example, when the hoisting rope 600 is wound around the second fixed pulley 760 and the first movable pulley 750 twice, the weight of the pitch bearing 400 and the blade 500 connected to the pitch bearing 400 will be shared by the six sections of the hoisting rope 600. In this way, the winch can lift the pitch bearing 400 and the blade 500 with only one-sixth of their weight, making the lifting more labor-saving.

[0054] As an example, as shown in Figure 2, the step of arranging the second fixed pulley 760 inside the hub 300 includes: setting the second fixed pulley 760 below the portion of the main shaft 200 of the wind turbine generator set that extends into the hub 300, and the second fixed pulley 760 being located above the first movable pulley 750.

[0055] In this example, the second fixed pulley 760 is fixed to the main shaft 200. Since the weight of the main shaft 200 falls onto the tower 100, during the hoisting process, part of the weight of the pitch bearing 400 and blade 500 can be transferred to the tower 100 via the hoisting rope 600 and the main shaft 200, resulting in good hoisting stability and high reliability. Moreover, positioning the second fixed pulley 760 above the first movable pulley 750 facilitates the upward hoisting of the pitch bearing 400 and blade 500 along a designated route. The pitch bearing 400 and blade 500 are less prone to displacement during hoisting, ensuring good hoisting stability.

[0056] Of course, in other examples, the second fixed pulley 760 can also be set in other positions, not limited to the examples above.

[0057] According to embodiments of this disclosure, further as shown in Figures 1 and 3, the installation method further includes: arranging a third fixed pulley 720 inside the nacelle of the wind turbine generator set; the step of connecting the hoisting rope 600 wound on the winch to the suspension structure 800 after being turned by the first fixed pulley 730 further includes: after being turned by the third fixed pulley 720, the hoisting rope 600 passes through the central cavity of the main shaft 200 of the wind turbine generator set into the interior of the hub 300 and is guided to the first fixed pulley 730.

[0058] The design of the third fixed pulley 720 here eliminates the need for the winch to be located inside the hub 300, thus avoiding occupying internal space. Instead, it can be placed outside the wind turbine or inside a spacious nacelle, facilitating stable winch installation and enabling the smooth application of tension to lift the pitch bearing 400 and blades 500. Furthermore, having the lifting rope 600 pass through the hollow of the main shaft 200 from one side and connect to the suspension structure 800 helps to bring the center of gravity closer to the tower 100, even allowing the tower 100 to bear part of the weight. This reduces the likelihood of the tower 100 tilting or other components shifting and being damaged during lifting.

[0059] As an example, the step of arranging the third fixed pulley 720 inside the nacelle of the wind turbine generator set includes: arranging the third fixed pulley 720 on the base inside the nacelle, the third fixed pulley 720 being located on the side of the generator of the wind turbine generator set away from the hub 300 and being distributed opposite to the central cavity of the main shaft 200.

[0060] In this example, the base of the nacelle cover is typically fixed to the top of the tower 100. Installing the third fixed pulley 720 on the base of the nacelle cover provides good stability and allows it to bear a significant weight, transferring it to the tower 100 and improving lifting stability. Furthermore, by positioning the third fixed pulley 720 on the side of the generator away from the hub 300, and having the hoisting rope 600 deflect through the third fixed pulley 720 and pass through the central space of the main shaft 200 to connect with the suspension structure 800, the third fixed pulley 720 and the first fixed pulley 730 will be located on opposite sides of the tower 100. During hoisting, the overall center of gravity will be closer to the central axis of the tower 100, further enhancing hoisting stability.

[0061] As shown in Figure 3, the third fixed pulley 720 can be fixed to the base by the set screw 702.

[0062] Of course, in other examples, the third fixed pulley 720 can also be set in other positions, such as the end of the main shaft 200 away from the hub 300, etc., and is not limited to the above examples.

[0063] According to embodiments of this disclosure, further as shown in Figures 1 and 4, the installation method further includes: arranging a winch at the bottom of the wind turbine tower 100, and arranging a fourth fixed pulley 710 above the winch at the bottom of the tower 100; the step of connecting the hoisting rope 600 wound on the winch to the suspension structure 800 after being turned by the first fixed pulley 730 further includes: extending the hoisting rope 600 from below the fourth fixed pulley 710, after being turned by the fourth fixed pulley 710, to the rear of the upper nacelle cover, entering the nacelle cover from the rear opening of the nacelle cover, and guiding it to the third fixed pulley 720.

[0064] The winch is positioned at the bottom of the tower 100, for example, directly on the ground around the tower 100. This design facilitates easy and stable installation, allowing for the smooth application of tension to pull the pitch bearing 400 and blades 500 without loosening or shifting during operation. Furthermore, a fourth fixed pulley 710 is positioned above the winch at the bottom of the tower 100. The hoisting rope 600 extends from below the fourth fixed pulley 710, passes under it, turns, and extends towards the rear of the upper engine nacelle, approaching the third fixed pulley 720. The design of the fourth fixed pulley 710 helps to restrict the position of the hoisting rope 600, keeping it close to the tower 100 and minimizing space occupation. In addition, the hoisting rope 600 extends upward from one side of the tower 100 into the nacelle cover, passes through the central cavity of the main shaft 200 and enters the hub 300 to connect with the suspension structure 800. During the hoisting process, the winch and blades 500 can be roughly distributed on both sides of the tower 100, which helps to keep the hoisting center of gravity close to the center of the tower 100 and reduces the probability of the tower 100 tilting or other components shifting and being damaged during the hoisting process.

[0065] As an example, as shown in Figure 4, the step of arranging the fourth fixed pulley 710 above the bottom winch of the tower 100 further includes: fixing the fourth fixed pulley 710 to the tower 100 using a clamp 701. The fourth fixed pulley 710 is easy and quick to install, has good installation stability, and can reduce the probability of the fourth fixed pulley 710 detaching from the tower 100. Moreover, there is no need to drill mounting holes or other structures on the tower 100 to connect the fourth fixed pulley 710, which helps ensure the structural strength of the tower 100, simplifies the installation steps, and saves costs.

[0066] According to an embodiment of this disclosure, further as shown in FIG1, the installation method further includes: arranging a fifth fixed pulley 740 inside the hub 300, the fifth fixed pulley 740 being located below the first fixed pulley 730 and above the first movable pulley 750, and the fifth fixed pulley 740 being horizontally positioned between the first fixed pulley 730 and the first movable pulley 750; the lifting rope 600, after being turned by the first fixed pulley 730, is then turned by the fifth fixed pulley 740 and led to the area below the first movable pulley 750. The design of the fifth fixed pulley 740, on the one hand, increases the movement path of the lifting rope 600 during the lifting process, increases the friction with the lifting rope 600, thereby improving lifting stability; on the other hand, it facilitates guiding the lifting rope 600 to the first movable pulley 750.

[0067] According to an embodiment of the present disclosure, further as shown in Figures 9 and 10, the step of connecting the suspension structure 800 to the pitch bearing 400 mounted on the blade 500 includes: passing a suspension mounting bolt 806 through a portion of the first bolt hole 410 on the suspension structure 800 and the pitch bearing 400 for connection with the hub 300, so as to connect the suspension structure 800 to the pitch bearing 400.

[0068] Here, the suspension structure 800 is connected to the first bolt hole 410 on the pitch bearing 400, which is used for connection with the hub 300. This eliminates the need for an additional connection structure on the pitch bearing 400 to connect to the suspension structure 800. This approach helps ensure the structural strength of the pitch bearing 400 and simplifies its manufacturing process, reducing costs. Furthermore, different models of pitch bearings 400 can be connected to the suspension structure 800 through the first bolt hole 410 on the part of the pitch bearing 400 that connects to the hub 300, making the installation method in this embodiment highly versatile.

[0069] Furthermore, a suspension mounting bolt 806 is used to connect the suspension structure 800 and the pitch bearing 400 by passing through the suspension structure 800 and part of the first bolt hole 410. Specifically, a nut is placed at the end of the suspension mounting bolt 806 that passes through the first bolt hole 410. The suspension structure 800 and the pitch bearing 400 are connected by bolts, which ensures a secure installation and prevents the pitch bearing 400 from detaching from the suspension structure 800 and falling during hoisting.

[0070] In addition, to further prevent the pitch bearing 400 and blade 500 from falling during hoisting, the suspension structure 800 can be positioned on the side of the pitch bearing 400 closer to the blade 500, and a portion of the suspension structure 800 can extend to one side of the inner and outer rings of the pitch bearing 400. In this way, during hoisting, both the inner and outer rings of the pitch bearing 400 are supported by the suspension structure 800, making it difficult for the inner and outer rings of the pitch bearing 400 to separate, thereby preventing the pitch bearing 400 and blade 500 from falling during hoisting.

[0071] According to embodiments of this disclosure, further as shown in Figures 9 and 10, before starting the winch, the method further includes: mounting a blade brake structure 804 on the pitch bearing 400 or the suspension structure 800, and pressing the inner wall of the blade 500 with the blade brake structure 804 to restrict the rotation of the blade 500. This can prevent the blade 500 from rotating during hoisting, causing a change in center, or from colliding with surrounding components.

[0072] As an example, the steps for mounting the blade brake structure 804 on the pitch bearing 400 include: mounting the blade brake structure 804 on the pitch bearing 400 at the first bolt hole 410 for connection with the hub 300. This eliminates the need for an additional connection structure on the pitch bearing 400 to connect with the blade brake structure 804, ensuring the structural strength of the pitch bearing 400, simplifying the installation process, and saving costs.

[0073] Furthermore, in some embodiments, the suspension rope 600 can be a steel wire rope. It has high structural strength, is not easily broken, and has good wear and corrosion resistance.

[0074] It should be noted that the installation method for the pitch bearing 400 and blade 500 of the wind turbine generator set proposed in this disclosure can vary in the order of each step and is not limited to the above embodiment. For example, the suspension structure 800 can be connected to the pitch bearing 400 first, and then the first fixed pulley 730 can be arranged in the hub 300. In addition, the arrangement order and position of each pulley can also be changed, and the number of pulleys is not specifically limited, as long as the winch and pulleys are used to lift the pitch bearing 400 and blade 500, it is in line with the technical concept of this disclosure.

[0075] In addition to the installation methods for the pitch bearing 400 and blade 500 of the wind turbine generator set described above, if it is necessary to replace the pitch bearing 400 and blade 500, a winch and pulleys can also be used to lift the pitch bearing 400 and the blade 500 connected to the pitch bearing 400 down from the tower. The disassembly methods for the pitch bearing 400 and blade 500 are described in detail below.

[0076] A second aspect of this disclosure provides a method for disassembling a blade 500 of a wind turbine generator set. The disassembly method includes: arranging a first fixed pulley 730 inside the hub 300 of the wind turbine generator set; connecting a suspension structure 800 to a pitch bearing 400 mounted on the blade 500; turning a hoisting rope 600 wound on a winch through the first fixed pulley 730 and connecting it to the suspension structure 800; separating the pitch bearing 400 from the hub 300 of the wind turbine generator set; starting the winch; and using the hoisting rope 600 to simultaneously lift the pitch bearing 400 and the blade 500 connected to the pitch bearing 400 down the tower.

[0077] The method for disassembling the blade 500 of the wind turbine generator provided in this disclosure involves connecting the suspension structure 800 to the pitch bearing 400, and connecting the hoisting rope 600 on the winch to the suspension structure 800 after being turned by the first fixed pulley 730. After the pitch bearing 400 is separated from the hub 300 of the wind turbine generator, the winch is used to simultaneously lift the pitch bearing 400 and the blade 500 connected to the pitch bearing 400 down the tower. Compared with the related technology that uses a large crane to lift the rotor as a whole down the tower, this method eliminates the need for a large crane, avoids the rental cost of a large crane, saves installation costs, and greatly reduces the lifting weight, thus improving safety.

[0078] Especially for mountainous projects, the entry of large cranes is difficult, potentially requiring road construction or land acquisition, which can lead to prolonged downtime of wind turbines and significant power generation losses. Furthermore, the cost of bringing in large cranes is high, and other costs such as land acquisition may also be involved, resulting in excessively high overall installation costs. In this embodiment, the existing structure of the wind turbine is utilized with installation pulleys, and a winch is used in conjunction with the pulleys. This eliminates the need for a large crane to disassemble the blades 500 and pitch bearing 400, significantly reducing installation costs and allowing for rapid on-site access. This minimizes economic losses caused by prolonged downtime and solves the problems of long disassembly cycles and high installation costs associated with the pitch bearing 400 and blades 500 in related technologies.

[0079] During the disassembly process, the hub 300 can be rotated first so that the port connecting the hub 300 and the pitch bearing 400 faces downward, which makes it easier to lower the pitch bearing 400 and the blade 500.

[0080] Furthermore, the step of arranging the first fixed pulley 730 inside the hub 300 of the wind turbine generator set can be the same as the step of arranging the first fixed pulley 730 in the above-described method for installing the pitch bearing 400 and the blade 500, and will not be repeated here.

[0081] In addition to arranging the first fixed pulley 730 inside the hub 300, the first movable pulley 750, the second fixed pulley 760, the third fixed pulley 720, the fourth fixed pulley 710 and the fifth fixed pulley 740 can be arranged in the same way as the above-mentioned installation method of the pitch bearing 400 and the blade 500, so that the winch and the pulley block 700 cooperate to lift the pitch bearing 400 and the blade 500 down the tower. This will not be described in detail here.

[0082] Unlike the installation method of blade 500 described above, it is necessary to consider how the suspension structure 800 is connected to the pitch bearing 400. This connection must be achieved without the pitch bearing 400 and blade 500 falling off. Furthermore, the pitch bearing 400 needs to be separated from the hub 300 before starting the winch to facilitate the lowering of the pitch bearing 400 and blade 500. Therefore, the following description mainly focuses on these two aspects.

[0083] According to an embodiment of this disclosure, further as shown in Figures 5 to 10, the step of connecting the suspension structure 800 to the pitch bearing 400 mounted on the blade 500 includes: disassembling some of the mounting bolts connecting the pitch bearing 400 and the hub 300; passing a limiting bolt 801 through a portion of the first bolt hole 410 on the pitch bearing 400 for mounting bolts to pass through and a portion of the second bolt hole 310 on the hub 300 for mounting bolts to pass through, wherein the length of the limiting bolt 801 is greater than the length of the mounting bolt; disassembling all remaining mounting bolts connecting the pitch bearing 400 and the hub 300; and passing a suspension mounting bolt 806 through the suspension structure 800 and a portion of the first bolt hole 410 to connect the suspension structure 800 to the pitch bearing 400.

[0084] In this embodiment, the suspension structure 800 is connected to the first bolt hole 410 on the pitch bearing 400, eliminating the need for an additional connecting structure on the pitch bearing 400 to connect it to the suspension structure 800, thus ensuring the structural strength of the pitch bearing 400. Furthermore, the suspension structure 800 and the pitch bearing 400 are connected by suspension mounting bolts 806, ensuring a secure installation and preventing the pitch bearing 400 and blade 500 from detaching from the suspension structure 800, thereby guaranteeing lifting safety. Additionally, before installing the suspension structure 800, some mounting bolts connecting the pitch bearing 400 and the hub 300 are first removed, allowing the longer limiting bolt 801 to connect the pitch bearing 400 and the hub 300. The remaining mounting bolts are then removed, preventing the pitch bearing 400 and blade 500 from accidentally falling off. Furthermore, the limiting bolt 801 provides protection. After all mounting bolts are removed, the pitch bearing 400 and the hub 300 can be connected by the limiting bolt 801, preventing the pitch bearing 400 and blades 500 from accidentally falling off. In addition, using a longer limiting bolt 801 to connect the pitch bearing 400 and the hub 300 allows them to be kept apart, providing installation space for the suspension mounting bolt 806 to be fixed.

[0085] Figures 5 and 6 show partial structural schematic diagrams of the pitch bearing 400 and the hub 300. In Figures 5 and 6, the pitch bearing 400 and the hub 300 are connected together by a relatively long limiting bolt 801. The lower end of the limiting bolt 801 protrudes from the pitch bearing 400 in the figures, with a protrusion length of ≥100mm. This allows for a working space 420 of more than 100mm between the two, facilitating the connection of the suspension structure 800.

[0086] Furthermore, as shown in Figures 5, 6, 7, and 8, after the step of removing all remaining mounting bolts connecting the pitch bearing 400 and the hub 300, and before the step of passing the suspension mounting bolt 806 through the suspension structure 800 and part of the first bolt hole 410, the method further includes: using the lifting mechanism 802 to move the pitch bearing 400 and blade 500 away from the hub 300, thereby forming a working space 420 between the pitch bearing 400 and the hub 300. This facilitates the tightening of the nut onto the suspension mounting bolt 806 within the working space 420, thus achieving the connection between the pitch bearing 400 and the hub 300. Moreover, using the lifting mechanism 802 to separate the pitch bearing 400 and the hub 300 is convenient.

[0087] In addition, since the length of the limiting bolt 801 is greater than the length of the mounting bolt, the pitch bearing 400 and the hub 300 can remain connected by the limiting bolt 801 during the process of the lifting mechanism 802 separating the pitch bearing 400 and the hub 300, and can move within the length range of the limiting bolt 801, thus preventing the pitch bearing 400 and the blade 500 from falling off the hub 300.

[0088] As an example, as shown in Figures 5, 6, 7, and 8, the lifting mechanism 802 includes a tie rod 8021 and a hollow jack 8022 connected to the tie rod 8021. The steps of removing all remaining mounting bolts connecting the pitch bearing 400 and the hub 300, and using the lifting mechanism 802 to move the pitch bearing 400 and blade 500 away from the hub 300 to form a working space 420 between the pitch bearing 400 and the hub 300 include: passing the first end of the tie rod 8021 successively through a portion of the first bolt hole 410 and a portion of the second bolt hole 310 to connect it to the first fixing nut; The second end of the control rod 8021 of the hollow jack 8022 extends away from the hub 300 to clamp the hub 300 and the pitch bearing 400 between the first fixing nut and the hollow jack 8022; remove all remaining mounting bolts connecting the pitch bearing 400 and the hub 300; retract the second end of the control rod 8021 of the hollow jack 8022 towards the hub 300, and the pitch bearing 400 and the blade 500 move down along the control rod 8021 under the action of gravity to form a working space 420 between the pitch bearing 400 and the hub 300.

[0089] Figures 5 and 6 show schematic diagrams of the connection between the jacking mechanism 802 and the first bolt hole 410 on the pitch bearing 400. The first end (upper end in the figures) of the pull rod 8021 passes through part of the first bolt hole 410 and part of the second bolt hole 310 and is connected to a first fixing nut (not shown). A hollow jack 8022 is provided on the pull rod 8021, and the second end of the pull rod 8021 has a second fixing nut 8023, which supports the hollow jack 8022. In the initial state, the second end (lower end in the figures) of the pull rod 8021 extends out, while the first end of the pull rod 8021 retracts relative to the hollow jack 8022. The pitch bearing 400 and the hub 300 are sandwiched between the first fixing nut and the hollow jack 8022. Then, as shown in Figures 5 and 6, the second end of the pull rod 8021 retracts, while the first end of the pull rod 8021 extends upward. Since the hub 300 remains stationary, the pitch bearing 400 and blades 500 can move downward along the pull rod 8021 under their own weight, as shown in Figures 7 and 8. At this time, the pitch bearing 400 falls onto the hollow jack 8022, and there is a working space 420 between the pitch bearing 400 and the hub 300. Operation is convenient.

[0090] Furthermore, as shown in Figures 9 and 10, after the step of using the lifting mechanism 802 to move the pitch bearing 400 and blade 500 away from the hub 300 to form a working space 420 between the pitch bearing 400 and the hub 300, and before the step of passing the suspension mounting bolt 806 through the suspension structure 800 and part of the first bolt hole 410, the method further includes: placing a limiting pad 803 within the working space 420 to restrict the rotation of the blade 500. The design of the limiting pad 803 can prevent the pitch bearing 400 from rotating, thereby preventing the blade 500 from rotating.

[0091] According to embodiments of this disclosure, further as shown in Figures 5 to 10, after the step of disassembling some of the mounting bolts connecting the pitch bearing 400 and the hub 300, and before the step of disassembling all remaining mounting bolts connecting the pitch bearing 400 and the hub 300, the method further includes: installing a blade brake structure 804 at a portion of the first bolt holes 410, and pressing the inner wall of the blade 500 with the blade brake structure 804 to restrict the rotation of the blade 500. The design of the blade brake structure 804 can, on the one hand, prevent the rotation center of the blade 500 from shifting and affecting the lifting stability, and on the other hand, prevent the blade 500 from colliding with surrounding components and being damaged. In addition, connecting the blade brake structure 804 to the first bolt holes 410 of the pitch bearing 400 eliminates the need for an additional connecting structure on the pitch bearing 400 to connect with the blade brake structure 804, ensuring the structural strength of the pitch bearing 400 and simplifying the disassembly steps.

[0092] According to an embodiment of this disclosure, further as shown in Figures 5 to 10, after the step of removing some of the mounting bolts connecting the pitch bearing 400 and the hub 300, and before the step of removing all the remaining mounting bolts connecting the pitch bearing 400 and the hub 300, the method further includes: passing a guide rod 805 through a portion of the first bolt hole 410 and a portion of the second bolt hole 310, so that the pitch bearing 400 and the blade 500 can move away from the hub 300 along the guide rod 805.

[0093] Here, the guide rod 805 is used to limit the downward movement path of the pitch bearing 400 and the blade 500, which can prevent the pitch bearing 400 and the blade 500 from shifting during the downward movement and causing the limit bolt 801 to jam.

[0094] According to an embodiment of this disclosure, the step of separating the pitch bearing 400 from the hub 300 of the wind turbine generator set further includes: removing the limiting bolt 801 from the pitch bearing 400 and the hub 300. This facilitates the subsequent lowering of the pitch bearing 400 and the blades 500.

[0095] According to an embodiment of this disclosure, the further step of starting the winch and simultaneously hoisting the pitch bearing 400 and blade 500 down the tower using the hoisting rope 600 includes: starting the winch to lower the pitch bearing 400 and blade 500, and during the lowering process, using a crane and a blade clamp 900 connected to the crane to guide the blade 500 from a vertical position to a horizontal position, so that the blade 500 is horizontally lowered onto the blade 500 support on the ground. This can prevent the blade 500 from being damaged by collision.

[0096] As an example, as shown in Figures 11 and 12, before starting the winch, the tail of the blade 500 is clamped by the blade clamp 900, and the crane is connected to the blade clamp 900 through the clamp lifting rope 910 to guide the tail of the blade 500 during the lowering process.

[0097] The installation and disassembly methods for the pitch bearing 400 and blade 500 proposed in the above embodiments of this disclosure can be used not only for individual installation and disassembly, but also sequentially when replacing the pitch bearing 400 and blade 500. For example, a winch and pulley can be arranged first to hoist the pitch bearing 400 and blade 500 to be replaced down the tower. Then, without having to arrange the winch and pulley again, the replaced pitch bearing 400 and blade 500 can be directly hoisted back up the tower simultaneously according to the above steps and the original path, which is convenient to operate.

[0098] Compared to related technologies where replacing the pitch bearing 400 and blade 500 using a large crane costs over 500,000 yuan per wind turbine rotor, the replacement cost for the pitch bearing 400 and blade 500 per wind turbine in this embodiment is less than 200,000 yuan, significantly reducing replacement costs. Furthermore, when large cranes are needed for road construction or land acquisition, the rotor replacement time for a single wind turbine is approximately 20 days, while the replacement time for the pitch bearing 400 and blade 500 per wind turbine in this embodiment is approximately 7 days, reducing downtime by about two weeks per turbine and greatly shortening the replacement cycle.

[0099] While embodiments of the present disclosure have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present disclosure without departing from the spirit and scope thereof. 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 disclosure as defined in the claims.

Claims

1. A method for installing the blades of a wind turbine generator set, wherein, The installation method includes: A first fixed pulley (730) is arranged inside the hub (300) of the wind turbine generator set; The suspension structure (800) is connected to the pitch bearing (400) mounted on the blade (500); The hoisting rope (600) wound on the winch is turned by the first fixed pulley (730) and then connected to the suspension structure (800); Start the winch and use the hoisting rope (600) to simultaneously hoist the pitch bearing (400) and the blade (500) onto the tower.

2. The method for installing the blades of a wind turbine generator set according to claim 1, wherein, The installation method further includes: arranging a first movable pulley (750) on the suspension structure (800); The step of connecting the hoisting rope (600) wound on the winch to the suspension structure (800) after turning it through the first fixed pulley (730) includes: turning the hoisting rope (600) through the first fixed pulley (730), turning it again after passing it from below through the first movable pulley (750), and connecting the end of the hoisting rope (600) to the fixed structure of the wind turbine generator set.

3. The method for installing the blades of a wind turbine generator set according to claim 2, wherein, The installation method further includes: arranging a second fixed pulley (760) inside the hub (300). The step of connecting the hoisting rope (600) wound on the winch to the suspension structure (800) after turning it through the first fixed pulley (730) further includes: turning the hoisting rope (600) from below through the first movable pulley (750), then passing it from above through the second fixed pulley (760), and then passing it from below again through the first movable pulley (750). After the hoisting rope (600) is wound around the second fixed pulley (760) and the first movable pulley (750) at least one turn, the end of the hoisting rope (600) is connected to the fixed structure.

4. The method for installing the blades of a wind turbine generator set according to claim 3, wherein, The installation method further includes: arranging a third fixed pulley (720) inside the nacelle of the wind turbine generator set; The step of connecting the hoisting rope (600) wound on the winch to the suspension structure (800) after being turned by the first fixed pulley (730) further includes: after being turned by the third fixed pulley (720), the hoisting rope passes through the central cavity of the main shaft (200) of the wind turbine generator set and enters the interior of the hub (300), and is guided to the first fixed pulley (730).

5. The method for installing the blades of a wind turbine generator set according to claim 4, wherein, The installation method further includes: arranging the winch at the bottom of the tower (100) of the wind turbine generator set, and arranging a fourth fixed pulley (710) above the winch at the bottom of the tower (100); The step of connecting the hoisting rope (600) wound on the winch to the suspension structure (800) after being turned by the first fixed pulley (730) further includes: extending the hoisting rope (600) from below the fourth fixed pulley (710) to the rear of the upper engine compartment cover after being turned by the fourth fixed pulley (710), entering the engine compartment cover from the rear opening of the engine compartment cover and guiding it to the third fixed pulley (720).

6. The method for installing the blades of a wind turbine generator set according to claim 5, wherein, The step of arranging the first fixed pulley (730) inside the hub (300) of the wind turbine generator set includes: arranging the first fixed pulley (730) on the end face of the main shaft (200) of the wind turbine generator set that extends into the hub (300); and / or The step of arranging the second fixed pulley (760) inside the hub (300) includes: arranging the second fixed pulley (760) below the portion of the main shaft (200) of the wind turbine generator set that extends into the hub (300), the second fixed pulley (760) being located above the first movable pulley (750); and / or The step of arranging the third fixed pulley (720) inside the nacelle of the wind turbine generator set includes: arranging the third fixed pulley (720) on a base inside the nacelle, the third fixed pulley (720) being located on the side of the generator of the wind turbine generator set away from the hub (300) and distributed opposite to the central cavity of the main shaft (200); and / or The step of connecting the end of the suspension rope (600) to the fixed structure of the wind turbine generator set includes: fixing the end of the suspension rope (600) to the main shaft (200) of the wind turbine generator set; and / or The step of arranging the fourth fixed pulley (710) above the winch at the bottom of the tower (100) further includes fixing the fourth fixed pulley (710) to the tower (100) by means of a clamp (701).

7. The method for installing the blades of a wind turbine generator set according to claim 2, wherein, The installation method further includes: arranging a fifth fixed pulley (740) inside the hub (300), the fifth fixed pulley (740) being located below the first fixed pulley (730) and above the first movable pulley (750), and the fifth fixed pulley (740) being located horizontally between the first fixed pulley (730) and the first movable pulley (750); After the suspension rope (600) is turned by the first fixed pulley (730), it is turned by the fifth fixed pulley (740) and led to the bottom of the first movable pulley (750).

8. The method for installing the blades of a wind turbine generator set according to claim 1, wherein, The step of connecting the suspension structure (800) to the pitch bearing (400) mounted on the blade (500) includes: The suspension mounting bolt (806) is passed through the first bolt hole (410) on the suspension structure (800) and the pitch bearing (400) for connection with the hub (300) to connect the suspension structure (800) to the pitch bearing (400).

9. The method for installing the blades of a wind turbine generator set according to claim 1, wherein, Prior to the step of starting the winch, the following is also included: The blade brake structure (804) is installed on the pitch bearing (400) or the suspension structure (800), and the blade brake structure (804) presses against the inner wall of the blade (500) to restrict the rotation of the blade (500).

10. A method for disassembling the blades of a wind turbine generator set, wherein, The disassembly method includes: A first fixed pulley (730) is arranged inside the hub (300) of the wind turbine generator set. The suspension structure (800) is connected to the pitch bearing (400) mounted on the blade (500); The hoisting rope (600) wound on the winch is turned by the first fixed pulley (730) and then connected to the suspension structure (800); Separate the pitch bearing (400) from the hub (300) of the wind turbine generator set; Start the winch and use the hoisting rope (600) to simultaneously lift the pitch bearing (400) and the blade (500) down the tower.

11. The method for disassembling the blades of a wind turbine generator set according to claim 10, wherein, The disassembly method further includes: arranging a first movable pulley (750) on the suspension structure (800); The step of connecting the hoisting rope (600) wound on the winch to the suspension structure (800) after turning it through the first fixed pulley (730) includes: turning the hoisting rope (600) through the first fixed pulley (730), turning it again after passing it from below through the first movable pulley (750), and connecting the end of the hoisting rope (600) to the fixed structure of the wind turbine generator set.

12. The method for disassembling the blades of a wind turbine generator set according to claim 11, wherein, The disassembly method further includes: arranging a second fixed pulley (760) inside the hub (300). The step of connecting the hoisting rope (600) wound on the winch to the suspension structure (800) after turning it through the first fixed pulley (730) further includes: turning the hoisting rope (600) from below through the first movable pulley (750), then passing it from above through the second fixed pulley (760), and then passing it from below again through the first movable pulley (750). After the hoisting rope (600) is wound around the second fixed pulley (760) and the first movable pulley (750) at least one turn, the end of the hoisting rope (600) is connected to the fixed structure.

13. The method for disassembling the blades of a wind turbine generator set according to claim 12, wherein, The disassembly method further includes: arranging a third fixed pulley (720) inside the nacelle of the wind turbine generator set; The step of connecting the hoisting rope (600) wound on the winch to the suspension structure (800) after being turned by the first fixed pulley (730) further includes: after being turned by the third fixed pulley (720), the hoisting rope passes through the central cavity of the main shaft (200) of the wind turbine generator set and enters the interior of the hub (300), and is guided to the first fixed pulley (730).

14. The method for disassembling the blades of a wind turbine generator set according to claim 13, wherein, The dismantling method further includes: arranging the winch at the bottom of the tower (100) of the wind turbine generator set, and arranging a fourth fixed pulley (710) above the winch at the bottom of the tower (100); The step of connecting the hoisting rope (600) wound on the winch to the suspension structure (800) after being turned by the first fixed pulley (730) further includes: extending the hoisting rope (600) from below the fourth fixed pulley (710) to the rear of the upper engine compartment cover after being turned by the fourth fixed pulley (710), entering the engine compartment cover from the rear opening of the engine compartment cover and guiding it to the third fixed pulley (720).

15. The method for disassembling the blades of a wind turbine generator set according to claim 14, wherein, The step of arranging the first fixed pulley (730) inside the hub (300) of the wind turbine generator set includes: arranging the first fixed pulley (730) on the end face of the main shaft (200) of the wind turbine generator set that extends into the hub (300); and / or The step of arranging the second fixed pulley (760) inside the hub (300) includes: arranging the second fixed pulley (760) below the portion of the main shaft (200) of the wind turbine generator set that extends into the hub (300), the second fixed pulley (760) being located above the first movable pulley (750); and / or The step of arranging the third fixed pulley (720) inside the nacelle of the wind turbine generator set includes: arranging the third fixed pulley (720) on a base inside the nacelle, the third fixed pulley (720) being located on the side of the generator of the wind turbine generator set away from the hub (300) and distributed opposite to the central cavity of the main shaft (200); and / or The step of connecting the end of the suspension rope (600) to the fixed structure of the wind turbine generator set includes: fixing the end of the suspension rope (600) to the main shaft (200) of the wind turbine generator set; and / or The step of arranging the fourth fixed pulley (710) above the winch at the bottom of the tower (100) further includes fixing the fourth fixed pulley (710) to the tower (100) by means of a clamp (701).

16. The method for disassembling the blades of a wind turbine generator set according to claim 11, wherein, The disassembly method further includes: arranging a fifth fixed pulley (740) inside the hub (300), the fifth fixed pulley (740) being located below the first fixed pulley (730) and above the first movable pulley (750), and the fifth fixed pulley (740) being located horizontally between the first fixed pulley (730) and the first movable pulley (750); After the suspension rope (600) is turned by the first fixed pulley (730), it is turned by the fifth fixed pulley (740) and led to the bottom of the first movable pulley (750).

17. The method for disassembling the blades of a wind turbine generator set according to claim 10, wherein, The step of connecting the suspension structure (800) to the pitch bearing (400) mounted on the blade (500) includes: Remove some of the mounting bolts connecting the pitch bearing (400) and the hub (300), and pass the limiting bolt (801) through the first bolt hole (410) on the pitch bearing (400) for the mounting bolt to pass through and the second bolt hole (310) on the hub (300) for the mounting bolt to pass through. The length of the limiting bolt (801) is greater than the length of the mounting bolt. Remove all remaining mounting bolts connecting the pitch bearing (400) and the hub (300); Suspension mounting bolts (806) are passed through the suspension structure (800) and part of the first bolt hole (410) to connect the suspension structure (800) to the pitch bearing (400).

18. The method for disassembling the blades of a wind turbine generator set according to claim 17, wherein, After the step of removing all remaining mounting bolts connecting the pitch bearing (400) and the hub (300), and before the step of passing the suspension mounting bolts (806) through the suspension structure (800) and part of the first bolt holes (410), the method further includes: The pitch bearing (400) and the blade (500) are moved away from the hub (300) by the lifting mechanism (802) to form a working space (420) between the pitch bearing (400) and the hub (300).

19. The method for disassembling the blades of a wind turbine generator set according to claim 18, wherein, The lifting mechanism (802) includes a tie rod (8021) and a hollow jack (8022) connected to the tie rod (8021). The step of removing all remaining mounting bolts connecting the pitch bearing (400) and the hub (300), and using the lifting mechanism (802) to move the pitch bearing (400) and the blade (500) away from the hub (300) to form a working space (420) between the pitch bearing (400) and the hub (300) includes: The first end of the pull rod (8021) is passed through part of the first bolt hole (410) and part of the second bolt hole (310) and connected to the first fixing nut; The hollow jack (8022) controls the second end of the pull rod (8021) to extend away from the hub (300) so that the hub (300) and the pitch bearing (400) are clamped between the first fixing nut and the hollow jack (8022). Remove all remaining mounting bolts connecting the pitch bearing (400) and the hub (300); The hollow jack (8022) controls the second end of the pull rod (8021) to retract towards the hub (300), and the pitch bearing (400) and the blade (500) move down along the pull rod (8021) under the action of gravity to form a working space (420) between the pitch bearing (400) and the hub (300).

20. The method for disassembling the blades of a wind turbine generator set according to claim 18, wherein, After the step of using the lifting mechanism (802) to move the pitch bearing (400) and the blade (500) away from the hub (300) to form a working space (420) between the pitch bearing (400) and the hub (300), and before the step of passing the suspension mounting bolt (806) through the suspension structure (800) and part of the first bolt hole (410), the method further includes: A limiting pad (803) is placed in the working space (420) to restrict the rotation of the blade (500).

21. The method for disassembling the blades of a wind turbine generator set according to claim 17, wherein, After the step of removing some of the mounting bolts connecting the pitch bearing (400) and the hub (300), and before the step of removing all remaining mounting bolts connecting the pitch bearing (400) and the hub (300), the method further includes: A blade brake structure (804) is installed at part of the first bolt hole (410), and the blade brake structure (804) presses against the inner wall of the blade (500) to restrict the rotation of the blade (500); and / or The guide rod (805) is passed through a portion of the first bolt hole (410) and a portion of the second bolt hole (310) so that the pitch bearing (400) and the blade (500) can move away from the hub (300) along the guide rod (805).

22. The method for disassembling the blades of a wind turbine generator set according to claim 10, wherein, The step of starting the winch and simultaneously hoisting the pitch bearing (400) and the blade (500) down the tower using the hoisting rope (600) includes: The winch is started to lower the pitch bearing (400) and the blade (500). During the lowering process, the blade (500) is tailed by a crane and a blade clamp (900) connected to the crane to adjust the blade (500) from a vertical position to a horizontal position so that the blade (500) can be lowered horizontally onto the blade (500) support on the ground.

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