Offshore wind turbine blade impeller assembly single crane hoisting method

Abstract

The application relates to the technical field of offshore wind turbine assembly, and aims at the problems of large assembly construction difficulty and long construction period of a traditional impeller, and provides an offshore wind turbine blade impeller assembly single-crane hoisting method, which comprises the following steps: S1: wind power installation ship stationing: moving a wind power installation ship to a wind turbine installation position, and setting the tail of the wind power installation ship to face the wind turbine installation position; S2: wind turbine tower installation: completing wind turbine tower hoisting through the wind power installation ship; S3: temporary fixing of an impeller hub: fixing the impeller hub to a wind power installation ship deck through a tooling piece; S4: blade stationing: parking a transport ship carrying blades to a side of the wind power installation ship; S5: blade installation: sequentially hoisting the blades to corresponding butt flanges of the hub through the wind power installation ship, and connecting and fixing the blade roots to the corresponding butt flanges of the hub. The application has the effect of reducing the impeller blade assembly difficulty.

Description

Technical Field

[0001] This application relates to the technical field of offshore wind turbine assembly, and in particular to a single crane hoisting method for assembling offshore wind turbine blades and impellers. Background Technology

[0002] Currently, the mainstream installation method for offshore wind turbine rotors is the "step-by-step high-altitude installation method". In the specific construction process, the rotor hub is first hoisted to the nacelle flange at the top of the tower to complete the positioning and fastening of the hub. Then, the wind turbine installation vessel ("Daqiao Haifeng", with a 2000t main crane and a 400t auxiliary crane) is used to hoist each blade to the hub at the top of the wind turbine tower. In the high-altitude environment, the blades are connected to the corresponding flange of the fixed hub and the bolts are tightened, and finally the assembly of the entire rotor is completed.

[0003] While the aforementioned installation methods for wind turbine rotors have been widely used in the installation of small and medium-sized offshore wind turbines, these methods have the following drawbacks in actual construction: Firstly, the blades need to be docked and fixed to the hub at high altitudes. Since the working height usually exceeds 100 meters, the blades are not only directly affected by sea waves during hoisting, but also subject to secondary disturbances caused by the swaying of the construction platform or transport vessel. This results in significant and irregular swaying of the blades, making it difficult to control their attitude manually or with simple traction devices. The docking accuracy between the blades and the hub is difficult to guarantee, and each blade docking takes a long time, making the construction difficult and the construction cycle long. Secondly, during actual operation, the blades are prone to collisions with the tower, construction platform, or other equipment due to irregular swaying, causing damage to the blades or turbine components. Summary of the Invention

[0004] To reduce the construction difficulty of offshore wind turbine rotors, this application provides a method for assembling offshore wind turbine blades and rotors using a single crane.

[0005] This application provides a single-crane hoisting method for assembling offshore wind turbine blades and impellers, which adopts the following technical solution: A method for assembling offshore wind turbine blades and impellers using a single crane includes the following steps: S1: Wind turbine installation vessel positioning: The wind turbine installation vessel is moved to the wind turbine installation location and positioned with the stern of the wind turbine installation vessel facing the wind turbine installation location. S2: Wind turbine tower installation: The wind turbine tower is hoisted using a wind turbine installation vessel; S3: Temporary fixing of impeller hub: Install and fix the impeller hub to the deck of the wind turbine installation vessel using tooling; S4: Blade placement: The transport vessel carrying the blades berths at one side of the wind turbine installation vessel. S5: Blade installation: The blades are hoisted sequentially to the corresponding mating flanges on the hub using the wind turbine installation vessel, and the blade roots are connected and fixed to the corresponding mating flanges on the hub.

[0006] By adopting the above technical solution, when installing the impeller, the impeller hub is temporarily fixed to the deck of the wind turbine installation vessel, and then the blades are assembled with the hub in sequence. Compared with the traditional impeller assembly construction, the blades and hub can be assembled on the relatively stable wind turbine installation vessel. The blades do not need to be connected to the hub under irregular swaying at high altitude, which greatly reduces the difficulty of attitude control and the deviation of docking accuracy. At the same time, it effectively reduces the risk of collision damage between the blades and the tower and equipment, shortens the time for single blade docking, and helps to reduce the difficulty of impeller assembly construction and shorten the overall construction cycle of the wind turbine.

[0007] Preferably, the wind turbine installation vessel includes a main crane and an auxiliary crane, both of which are located on the starboard side of the wind turbine installation vessel; the main crane and the auxiliary crane are located on the starboard aft side and starboard forward side, respectively. In step S1, when the wind turbine installation vessel is in position, the port side and starboard side of the crane platform vessel are respectively facing the water-facing side and the back side of the construction area. In step S3, the impeller hub is installed on the port side of the wind turbine installation vessel; In step S4, the transport vessel carrying the blades is moored to the starboard side of the wind turbine installation vessel; and the blade roots on the transport vessel carrying the blades are positioned with their roots facing the stern of the wind turbine installation vessel.

[0008] By adopting the above technical solution, and by mooring the transport vessel carrying the blades on the starboard side of the backwater side of the construction area, the relatively stable water environment on the backwater side can reduce the swaying of the transport vessel and the blades, which is conducive to the smooth lifting of the blades. At the same time, it avoids the situation where the transport vessel carrying the blades collide with the wind turbine installation vessel due to the impact of the water flow. By setting the blade root towards the stern, it is easier to match the lifting trajectory of the main crane on the starboard side, which is convenient for the main crane of the construction platform vessel to lift the blades.

[0009] Preferably, in step S3, when installing the impeller hub, two of the three mating flanges of the hub are oriented towards the port side of the wind turbine installation vessel, and the remaining mating flange is oriented towards the inside of the deck of the wind turbine installation vessel.

[0010] By adopting the above technical solution, with two flanges facing outwards on the port side and one facing inwards on the deck, the docking operation of two blades of the impeller can be completed in an open space, avoiding interference with the structure of the wind turbine installation vessel during the docking of the blades and the hub.

[0011] Preferably, in step S5, before lifting the blade, several guy ropes are installed at the blade root and blade tip. During the process of hoisting the blades to the hub by the wind turbine installation vessel, the air attitude of the blades is adjusted in conjunction with the guy ropes at both ends of the blades so that the blade roots are aligned with the corresponding docking flange of the hub.

[0012] By adopting the above technical solution, the lifting range of the auxiliary crane on the wind turbine installation vessel is limited, and it cannot cooperate with the main crane to complete the aerial attitude adjustment. By setting up guy ropes, after the main crane lifts the blade, the construction personnel on the wind turbine installation vessel can use the guy ropes at both ends of the blade to assist the main crane in completing the blade attitude adjustment. At the same time, by adjusting the tension and length of the guy ropes, it is helpful to offset the impact of small swaying at sea on the blade attitude and avoid irregular swaying of the blade. Compared with the method of lifting only by the main crane, it is helpful to ensure the docking accuracy of the blade and the hub.

[0013] Preferably, in step S5, the two blades facing the outer port side of the wind turbine installation vessel are installed sequentially, and then the blades facing the inner side of the deck of the wind turbine installation vessel are installed.

[0014] By adopting the above technical solution, it is beneficial to keep the clamping plate of the wind turbine installation vessel relatively empty during the process of connecting the first two blades, which makes it easier for construction personnel to adjust the air attitude of the blades in coordination with the main crane using guy ropes.

[0015] Preferably, in step S5, when hoisting the blade, the main crane of the wind turbine installation vessel is connected to the blade root and blade middle of the blade to be installed, and the auxiliary crane is connected to the blade tail of the blade to be installed. When lifting the blade, the main crane and the auxiliary crane work together to lift the blade upwards; after the blade is detached from the transport ship, the connection between the auxiliary crane and the blade is released.

[0016] By adopting the above technical solution, using an auxiliary crane to lift the blade tail for tail-running assistance helps to keep the blade in a stable lifting posture.

[0017] Preferably, in step S5, when connecting the auxiliary crane lifting device to the blade tail end, a detachable blade tip sleeve is fitted onto the blade tail end; the auxiliary crane lifting device is connected to the detachable blade tip sleeve via a cable. After the blade is lifted off the transport ship by the main crane and the auxiliary crane, the detachable blade tip sheath is removed from the tail end of the blade to disconnect the auxiliary crane from the tail end of the blade.

[0018] By adopting the above technical solution, by inserting a detachable blade tip sleeve into the tail end of the blade, the sleeve can effectively cover and protect the weak parts of the blade tip during the blade lifting process, avoiding direct contact with the lifting equipment that could cause squeezing or scratches. At the same time, it can disperse the tension applied by the lifting equipment, preventing local stress concentration at the blade tail from causing structural damage. Furthermore, after the blade is detached from the transport ship, the blade tip can be detached through the detachable blade tip sleeve to quickly disconnect the auxiliary crane from the blade, facilitating the rapid connection to the subsequent process of adjusting the blade's attitude using the main crane and guy ropes.

[0019] Preferably, the wind turbine installation vessel has temporary construction platforms extending from both its port and starboard sides, which are used for cable-stayed wind rope traction construction.

[0020] By adopting the above technical solution, the deck width of the wind turbine installation vessel is less than the overall length of the blade. By extending temporary construction platforms on the port and starboard sides of the wind turbine installation vessel, it is beneficial to increase the overall working space of the wind turbine installation vessel, thereby providing a reliable operating base for cable traction and improving the safety of traction operations.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. By temporarily fixing the impeller hub to the deck of the wind turbine installation vessel and completing the docking and assembly of the blades and hub on the wind turbine installation vessel, instead of the traditional high-altitude step-by-step assembly of impeller blades, it is beneficial to avoid the disturbance of blade attitude caused by high-altitude wind waves and platform sway, and reduce the risk of blade docking accuracy deviation and collision damage.

[0022] 2. By installing guy ropes at the blade root and blade tip, construction personnel can use the guy ropes to assist the main crane in adjusting the blade's attitude in the air when the wind turbine installation vessel hoists the blade. At the same time, the blade can be traction-limited, effectively reducing the impact of small swaying at sea on the blade's attitude and facilitating better alignment of the blade root with the hub flange.

[0023] 3. By first constructing the two blades facing the outer port side of the wind turbine installation vessel, it is beneficial to maintain sufficient operating space on the deck of the wind turbine installation vessel. This allows construction personnel to use guy ropes to assist in adjusting the blade's attitude during the blade hoisting process. Attached Figure Description

[0024] Figure 1 This is a schematic diagram used in this application to illustrate the state of the impeller hub being installed.

[0025] Figure 2 This is a schematic diagram used in this application to illustrate the positioning of the transport vessel carrying the blades.

[0026] Figure 3 This is a schematic diagram used in this application to illustrate the state of the first set of blades during hoisting.

[0027] Figure 4 This is a schematic diagram used in this application to illustrate the state of the second set of blades during hoisting.

[0028] Figure 5 This is a schematic diagram used in this application to illustrate the state of the third set of blades during hoisting.

[0029] Figure 6 This is a schematic diagram used in this application to illustrate a removable blade tip sheath.

[0030] Explanation of reference numerals in the attached figures: 1. Wind turbine installation vessel; 10. Construction platform; 11. Main crane; 12. Auxiliary crane; 2. Wind turbine tower; 3. Hub; 4. Transport vessel; 5. Blade; 6. Removable blade tip sheath; 61. Main belt; 62. Secondary belt; 611. Connecting belt; 612. Connecting pin; 63. Traction main rope. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0032] This application discloses a single-crane hoisting method for assembling offshore wind turbine blades and impellers, referring to... Figure 1 This includes the following steps: S1: Wind turbine installation vessel, 1st station: (Refer to...) Figure 1 In this embodiment, the wind turbine installation vessel 1 is the "Daqiao Haifeng". This vessel is equipped with one 2000t main crane 11 and one 400t auxiliary crane 12. Both the main crane 11 and the auxiliary crane 12 are integrated and arranged on the starboard side of the vessel, with the main crane 11 fixed to the starboard aft side and the auxiliary crane 12 located on the starboard forward side. Temporary construction platforms 10 are supported on both the port and starboard sides of the wind turbine installation vessel 1. These platforms utilize a Bailey bridge structure and are surrounded by protective railings.

[0033] Reference Figure 1 The specific steps of step S1 are as follows: S1.1: Positioning and Adjustment of Wind Turbine Installation Vessel 1: Wind turbine installation vessel 1 sails to the designated wind turbine installation area by itself, calibrates its position through the ship's onboard positioning system, and adjusts its hull attitude so that the stern of wind turbine installation vessel 1 is precisely facing the wind turbine installation position, and the port side of wind turbine installation vessel 1 faces the water-facing side of the construction area and the starboard side faces the water-repellent side of the construction area. S1.2: Positioning and Fixing: The wind turbine installation vessel 1 will sequentially perform the following procedures: lowering the pile legs, inserting piles, preloading, raising the platform, providing work support, lowering the platform, test-extracting piles, extracting piles, and raising the pile legs, in order to complete the installation and positioning of the wind turbine installation vessel 1.

[0034] S2: Wind turbine tower 2 installation: Refer to Figure 1After the tower section is transported and positioned, the first tower section is lifted by the main crane 11 of the wind turbine installation vessel 1 to directly above the wind turbine tower 2. The verticality of the tower section is adjusted to ensure precise alignment between the bottom flange of the tower section and the foundation flange. The first tower section is then fixed by inserting and tightening bolts. Subsequently, the remaining tower sections are lifted in sequence, and each section is spliced ​​and tightened until the tower is installed to the designed height. This step is existing technology and will not be described in detail here.

[0035] S3: Temporary fixing of impeller hub 3: Refer to Figure 1 The impeller hub 3 is installed and fixed to the deck of the wind turbine installation vessel 1 using tooling; the specific steps are as follows: S3.1: Fixture installation and fixing: Fixtures for connecting and fixing hub 3 are installed on the deck of wind turbine installation vessel 1 near the port side edge. The bottom end of the fixture is fixed to wind turbine installation vessel 1 by circumferential welding. The fixture is equipped with an adapter flange for connecting hub 3. S3.2: Hub 3 transport and positioning: Transport ship 4 transports hub 3 and moors it to the starboard side of wind turbine installation ship 1; S3.3: Hub 3 transfer: The hub 3 is lifted to the top of the tooling by the main crane 11 of the wind turbine installation vessel 1 in conjunction with the auxiliary crane; S3.4: Hub 3 Angle Adjustment: The hub 3 is rotated by the cooperation of the main crane 11 and the auxiliary crane 12 so that two of the three mating flanges of the hub 3 face the outer side of the port side of the installation vessel, and the remaining one faces the inner side of the deck. S3.5: Hub 3 fixing: Use studs, washers and nuts to fix hub 3. Connect the connecting flange at the bottom of hub 3 to the clamping flange on the workpiece.

[0036] S4: Blade 5 in place: Refer to Figure 1 and Figure 2 The transport ship 4 carrying the blade 5 berths to one side of the wind turbine installation ship 1, and the root of the blade 5 is facing the stern of the wind turbine installation ship 1 so that the root of the blade 5 is close to the main crane 11 of the wind turbine installation ship 1. After the transport ship 4 is in place, it is anchored and fixed. By mooring the transport vessel 4 to the wind turbine, it is beneficial to reduce the impact of water flow and avoid collisions between the transport vessel 4 carrying the blades 5 and the pile legs of the wind turbine installation vessel 1 caused by water flow impact during construction.

[0037] S5: Blade 5 installation: The blades 5 are hoisted sequentially to the corresponding connecting flanges of the hub 3 by the wind turbine installation vessel 1, and the root of the blade 5 is connected and fixed to the connecting flange of the hub 3.

[0038] Reference Figure 3 and Figure 5 The specific steps of step S5 are as follows: S5.1: First blade 5 hoisting: S5.1.1: Guy rope connection: Tie and fix several guy ropes at both ends of blade 5.

[0039] S5.1.2: Lifting tool installation: Install double-eye flat lifting straps, lifting tools, and detachable blade tip sleeves 6 at the blade root, blade middle, and blade tip of blade 5, respectively.

[0040] Reference Figure 6 The detachable blade tip sheath 6 includes a main belt 61, with several connecting parts connected to both ends of the main belt 61. The connecting parts at both ends of the main belt 61 are staggered, and each connecting belt 611 has a connecting ring at the end furthest from the main belt 61. A connecting pin 612 is provided between the two ends of the main belt 61, and the connecting pin 612 passes through the connecting ring on the connecting belt 611 at both ends of the main belt 61 to achieve the connection and fixation of the two ends of the main belt 61. A traction main rope 63 is connected to the end of the connecting pin 612. Two auxiliary belts 62 are connected to the outer periphery of the main belt 61, and each auxiliary belt 62 is connected to a traction auxiliary rope.

[0041] S5.1.3: Crane connection: Connect the hooks at both ends of the lifting beam of the main crane 11 of the wind turbine installation vessel 1 to the double-eye sling at the root of blade 5 and the lifting fixture in blade 5 respectively; connect the hook of the auxiliary crane 12 to the detachable blade tip sleeve 6 at the tail of blade 5.

[0042] S5.1.4: Lifting of blade 5: The blade 5 is lifted upward by the main crane 11 in conjunction with the auxiliary crane 12 until the blade 5 is detached from the transport ship 4; the tail of the blade 5 is lifted by the auxiliary crane 12 to smooth the tail of the blade 5; this helps to ensure that the blade 5 is lifted smoothly.

[0043] During the hoisting process of the auxiliary crane 12, the construction workers used the traction auxiliary ropes on the auxiliary belts 62 at both ends of the main belt 61 of the detachable blade tip sheath 6 to assist in pulling the detachable blade tip sheath 6.

[0044] S5.1.5: Disconnecting the auxiliary crane 12: Pull the connecting pin 612 at the end of the main belt 61 of the detachable blade tip sheath 6 away from the connecting ring by pulling the main rope 63, so that the two ends of the main belt 61 are far apart, thereby disconnecting the auxiliary crane 12 from the blade tail of the blade 5. In actual construction, if the main rope 63 cannot pull the connecting pin 612 away from the connecting ring, the construction personnel can move to the detachable blade tip sheath 6 by crane and manually unlock it.

[0045] S5.1.6: Aerial attitude adjustment of blade 5: The aerial attitude adjustment of blade 5 is completed by the main crane 11 in conjunction with the guy ropes at both ends of blade 5. When adjusting the first blade 5, specifically, the root of blade 5 is first swung away from the starboard side of the wind turbine installation vessel 1 so that the tail of blade 5 faces the starboard side of the wind turbine installation vessel 1; S5.1.7: Blade 5 in place: The main crane 11 lifts the blade 5, which has completed attitude adjustment, and moves it to the docking flange on the outside of the port side of the hub 3 facing the wind turbine installation vessel 1. S5.1.8: Blade 5 connection and fixing: The root flange of blade 5 is connected to the mating flange of hub 3 by bolts and nuts.

[0046] S5.2: Hoisting the second blade 5: Repeat step S5.1.

[0047] S5.3: Third blade 5 hoisting: S5.3.1: Guy rope connection: Tie and fix several guy ropes at both ends of blade 5.

[0048] S5.3.2: Lifting tool installation: Install double-eye flat lifting straps, lifting tools, and detachable blade tip sleeves 6 at the blade root, blade middle, and blade tip of blade 5, respectively.

[0049] S5.3.3: Crane connection: Connect the hooks at both ends of the lifting beam of the main crane 11 of the wind turbine installation vessel 1 to the double-eye sling at the root of blade 5 and the lifting fixture in blade 5 respectively; connect the hook of the auxiliary crane 12 to the detachable tip sleeve 6 at the tail of blade 5.

[0050] S5.3.4: Lifting of blade 5: The blade 5 is lifted upward by the main crane 11 in conjunction with the auxiliary crane 12 until the blade 5 is detached from the transport ship 4; the tail of the blade 5 is lifted by the auxiliary crane 12 to smooth the tail of the blade 5; this helps to ensure that the blade 5 is lifted smoothly.

[0051] S5.3.5: Disconnecting the auxiliary crane 12: Pull the connecting pin 612 at the end of the detachable blade tip sheath 6 main belt 61 from the connecting ring by pulling the main rope, so that the two ends of the main belt 61 are far apart, thereby disconnecting the auxiliary crane 12 from the blade 5 tail.

[0052] S5.3.6: Aerial attitude adjustment of blade 5: The aerial attitude adjustment of blade 5 is completed by the main crane 11 in conjunction with the guy ropes at both ends of blade 5. When adjusting the third blade 5, specifically, the blade root of blade 5 is first swung towards the starboard side of the wind turbine installation vessel 1 so that the blade root of blade 5 faces the starboard side of the wind turbine installation vessel 1; S5.3.7: Blade 5 in place: The main crane 11 lifts the blade 5, which has completed its attitude adjustment, and moves it to the hub 3, which is facing the docking flange located on the deck side of the wind turbine installation vessel 1. S5.3.8: Blade 5 connection and fixing: The root flange of blade 5 is connected to the mating flange of hub 3 by bolts and nuts.

[0053] By first constructing the docking hub 3, which faces the two blades 5 on the left side of the wind turbine installation vessel 1, it is beneficial to keep the deck of the wind turbine installation vessel 1 relatively empty. This makes it easier for construction personnel to adjust the attitude of the blades 5 with the help of guy ropes during the hoisting process.

[0054] In this application, during the impeller assembly stage, the impeller hub 3 is temporarily fixed to the deck of the wind turbine installation vessel 1 using tooling, and then each blade 5 is individually connected to the hub 3 to complete the assembly. Compared with traditional construction methods, this transfers the assembly operation of the blades 5 and hub 3 to the relatively stable shipboard deck environment, eliminating the need to complete the connection of the blades 5 and hub 3 at high altitudes. This effectively avoids the irregular swaying of the blades 5 caused by sea waves and platform swaying, significantly reduces the difficulty of blade attitude control and connection accuracy deviation, effectively avoids the risk of collision damage between the blades 5 and the tower and surrounding equipment, shortens the time required for a single blade 5 connection operation, and thus reduces the overall impeller assembly construction difficulty and shortens the total wind turbine installation cycle.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An offshore wind turbine blade rotor assembly crane lifting method, characterized by: Includes the following steps: S1: Wind turbine installation vessel (1) positioning: The wind turbine installation vessel (1) is moved to the wind turbine installation location and the stern of the wind turbine installation vessel (1) is positioned facing the wind turbine installation location; S2: Wind turbine tower (2) installation: The wind turbine tower (2) is hoisted by the wind turbine installation vessel (1); S3: Temporary fixing of impeller hub (3): The impeller hub (3) is fixed to the deck of the wind turbine installation vessel (1) using tooling. S4: Blade (5) in place: The transport ship (4) carrying the blade (5) berths to one side of the wind turbine installation ship (1); S5: Blade (5) installation: The blade (5) is hoisted sequentially to the docking flange corresponding to the hub (3) by the wind turbine installation vessel (1), and the root of the blade (5) is connected and fixed to the docking flange corresponding to the hub (3).

2. The method for assembling offshore wind turbine blades and impellers using a single crane according to claim 1, characterized in that: The wind turbine installation vessel (1) includes a main crane (11) and an auxiliary crane (12), both of which are located on the starboard side of the wind turbine installation vessel (1); the main crane (11) and the auxiliary crane (12) are located on the starboard aft side and the starboard fore side, respectively. In step S1, when the wind turbine installation vessel (1) is in position, the port side and the starboard side of the crane platform vessel are respectively facing the water-facing side and the water-repellent side of the construction area. In step S3, the impeller hub (3) is installed on the port side of the wind turbine installation vessel (1); In step S4, the transport vessel (4) carrying the blade (5) is moored to the starboard side of the wind turbine installation vessel (1); and the root of the blade (5) on the transport vessel (4) carrying the blade (5) is positioned facing the stern of the wind turbine installation vessel (1).

3. The method for assembling offshore wind turbine blades and impellers using a single crane according to claim 2, characterized in that: In step S3, when installing the impeller hub (3), two of the three mating flanges of the hub (3) are oriented toward the port side of the wind turbine installation vessel (1), and the remaining mating flange is oriented toward the inside of the deck of the wind turbine installation vessel (1).

4. The method for assembling offshore wind turbine blades and impellers using a single crane according to claim 1, characterized in that: In step S5, before lifting the blade (5), several guy ropes are installed at the root and tail of the blade (5). During the process of hoisting the blade (5) to the hub (3) by the wind turbine installation vessel (1), the air attitude adjustment of the blade (5) is completed in conjunction with the wind ropes at both ends of the blade (5) so that the blade root (5) faces the docking flange corresponding to the hub (3).

5. The method for assembling offshore wind turbine blades and impellers using a single crane according to claim 1, characterized in that: In step S5, the two blades (5) of the hub (3) facing the outside of the port side of the wind turbine installation vessel (1) are installed in sequence, and then the blades (5) of the hub (3) facing the inside of the deck of the wind turbine installation vessel (1) are installed.

6. The method for assembling offshore wind turbine blades and impellers using a single crane according to claim 4, characterized in that: In step S5, when hoisting the blade (5), the main crane (11) of the wind turbine installation vessel (1) is connected to the root and middle of the blade (5) to be installed, and the auxiliary crane (12) is connected to the tail of the blade (5) to be installed. When lifting the blade (5), the main crane (11) and the auxiliary crane (12) work together to lift the blade (5) upwards; after the blade (5) is separated from the transport ship (4), the connection between the auxiliary crane (12) and the blade (5) is released.

7. The method for assembling offshore wind turbine blades and impellers using a single crane according to claim 6, characterized in that: In step S5, when connecting the lifting device of the auxiliary crane (12) to the tail end of the blade (5), a detachable blade tip sleeve (6) is fitted onto the tail end of the blade (5); the lifting device of the auxiliary crane (12) is connected to the detachable blade tip sleeve (6) via a cable; After the blade (5) is lifted off the transport ship (4) by the main crane (11) in conjunction with the auxiliary crane (12), the detachable blade tip sleeve (6) is removed from the tail end of the blade (5) to disconnect the auxiliary crane (12) from the tail end of the blade (5).

8. The method for assembling offshore wind turbine blades and impellers using a single crane according to claim 4, characterized in that: The wind turbine installation vessel (1) has temporary construction platforms (10) extending from both the port and starboard sides. The temporary construction platforms (10) are used for cable-stayed wind rope traction construction.

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