False blade of fan and method for hoisting single blade of fan by utilizing false blade

By designing a fake blade for the fan and using it to replace the carriage system in the single blade lifting of the fan, the problems of high lifting amplitude and long weather window period during the lifting of the offshore wind turbine are solved, and a simpler and more economical lifting method is achieved.

CN119982350APending Publication Date: 2025-05-13HUADIAN HEAVY IND CO LTD +1
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Patent Information

Application Number
CN202411952760.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-27
Publication Date
2025-05-13

AI Technical Summary

Technical Problem

During the lifting of offshore wind turbine blades, the overall lifting method requires a high lifting range and a long weather window period, and a large-scale carriage system is required for single blade lifting, which increases costs.

Method used

A fan fake blade is designed, including crossbeams, elbows and mounting parts, equipped with adjustable counterweights, and the single blade lifting of the fan is used to avoid dependence on the wheel system.

Benefits of technology

The possibility of single blade lifting of fan is realized, the requirements for lifting ships and window periods are reduced, the operation is simplified, and the overall construction cost is reduced.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a fan false blade which comprises a cross beam, one end of the cross beam is provided with an elbow bent towards one side, the end, away from the cross beam, of the elbow is provided with a mounting part, and the end of the mounting part is provided with a connecting bolt; meanwhile, the invention further discloses a method for carrying out fan single-blade hoisting through the false blade, on the premise that the fan is not provided with a turning system or the torque provided by the turning system does not meet the requirement of the single-blade hoisting process through the false blade, fan single-blade hoisting is achieved, and the requirements for a hoisting ship and the window period are lowered. The overall weight and the gravity center position of the false blade can be adjusted by adjusting the weight and the position of the counter weight, and the false blade is suitable for blades of different sizes to be used; the device is easy to operate and convenient to use, the overall manufacturing cost is reduced, and good economical efficiency and practicability are achieved.
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Description

Technical Field

[0001] The invention relates to a false blade for a wind turbine and a method for hoisting a single blade of the wind turbine by using the false blade, belonging to the technical field of wind power equipment. Background Art

[0002] There are usually two ways to hoist offshore wind turbine blades: one is the single-blade hoisting method, which is to hoist the nacelle and hub first, and then use the special tool for blade hoisting - the blade clamp to hoist the wind turbine blades one by one and install them on the hub; the other method is to hoist the impeller as a whole. After the nacelle is hoisted, the blades and the hub are assembled into a whole on the deck of the hoisting ship, and then hoisted to the nacelle and connected to the nacelle.

[0003] The overall hoisting needs to be assembled on the ship deck, lifted and turned over by the main and auxiliary cranes, and then hoisted to the engine room by the main crane. The impeller has a large diameter, which requires a high hoisting range for the main and auxiliary cranes. After the turning over, the windward area is large and the weather window period is high, so there are certain disadvantages. Single-blade hoisting does not have these requirements and hoisting is relatively simple.

[0004] Because the single-blade lifting oblique insertion fixture requires a higher lifting height when lifting the oblique upper blade, and is limited by the lifting height of the lifting ship, the fixture used for single-blade lifting is generally a flat insertion lifter. The hub needs to be turned before lifting the blade, and the hub flange surface to be lifted is facing the horizontal direction. A turning system needs to be built into the fan, but as the unit increases, when one or two blades are lifted, the turning system needs to provide a considerable torque to rotate the impeller. The required turning system is larger and the cost increases. Summary of the invention

[0005] The purpose of the present invention is to provide a false blade for a fan, and also to provide a method for hoisting a single blade of a fan using the false blade. The present invention utilizes the false blade to achieve single blade hoisting of the fan without a winching system.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: a false blade of a fan, comprising: a crossbeam, one end of the crossbeam is provided with a elbow bent to one side, the end of the elbow away from the crossbeam is provided with a mounting portion, the end of the mounting portion is provided with a connecting bolt, and the mounting portion can be installed on the hub blade flange, which is the same as the mounting structure of the blade.

[0007] In the aforementioned fan false blade, a counterweight block is detachably mounted on the other end of the crossbeam, and the mounting position of the counterweight block on the crossbeam is adjustable, and the overall weight and center of gravity position can be adjusted by adjusting the counterweight block.

[0008] In the aforementioned fan false blade, the angle a between the center line of the elbow and the center line of the beam is 150°.

[0009] A method for hoisting a single blade of a fan using a false blade, characterized by comprising the following steps:

[0010] S1. Install the first blade in a horizontal direction on the first hub blade flange;

[0011] S2. After the first blade is installed and bolts are tightened, the blade clamp is released to hold the blade and the hub brake system is released. The hub rotates freely until the first blade is vertically downward. After locking the hub, the blade clamp is used to hoist the fake blade to the second hub blade flange for installation;

[0012] S3. After the false blades are installed and bolts are tightened, loosen the hub and lift the false blades until the third hub blade flange faces the horizontal direction, lock the hub brake system and yaw the nacelle hub, rotate 180° counterclockwise around the tower, so that the horizontal direction of the third hub blade flange changes from left to right;

[0013] S4. Use the blade clamp to hoist the second blade to the third hub blade flange for installation;

[0014] S5. After installation, loosen the blade clamp, yaw the nacelle hub, and rotate 180° clockwise around the tower;

[0015] S6. Release the wheel hub brake system, and rotate the wheel hub 30° clockwise driven by the motor until the fake blade is horizontal. Lock the wheel hub brake system and then hoist the blade fixture onto the fake blade.

[0016] S7, release the hub brake system, adjust the false blade until the second hub blade flange faces the horizontal direction, and then lock the hub brake system;

[0017] S8. Remove the fake blade, then use the blade clamp to lift the third blade to the second hub blade flange for installation to complete the entire installation.

[0018] In the aforementioned method of hoisting a single blade of a wind turbine using a false blade, in step S1, after the hub nacelle is hoisted, the hub is rotated by a motor so that the first hub blade flange is horizontally oriented, the brake system is locked so that the hub can no longer rotate freely, and a blade-specific clamp is used to hoist the first blade to a horizontal position, the blade root bolt is aligned with the hub blade flange bolt hole, and after it is fully in place, the bolts are tightened to complete.

[0019] In the aforementioned method of using a dummy blade to hoist a single blade of a wind turbine, the installation method of the dummy blade in step S2 is as follows: after locking the hub brake system, use the blade hoisting fixture to hoist the dummy blade to a horizontal position on the right side of the hub, align the root bolt of the dummy blade with the bolt hole of the second hub blade flange, and tighten the bolt after inserting it into the bolt hole.

[0020] In the aforementioned method of hoisting a single blade of a wind turbine using a false blade, in step S5, after loosening the blade clamp, the hoisting crane boom is rotated and the arm is bent to avoid the rotation path of the installed blade around the tower, and the nacelle hub is yawed and rotated 180° clockwise around the tower.

[0021] The above-mentioned method of using a fake blade to lift a single blade of a wind turbine comprises adjusting the weight and position of the counterweight block before using the fake blade so that the overall weight of the fake blade is the same as the weight of a blade, and the distance between the center of gravity and the root hub flange surface is the same as that of the blade.

[0022] Compared with the prior art, the present invention utilizes false blades to realize the single-blade hoisting of the wind turbine under the premise that the wind turbine has no turning system or the torque provided by the turning system does not meet the requirements of the single-blade hoisting process, thereby reducing the requirements for the hoisting ship and the window period; at the same time, the overall weight and center of gravity position of the false blade of the present invention can be adjusted by adjusting the weight and position of the counterweight, so as to be suitable for blades of different sizes; the present invention is not only simple to operate and easy to use, but also reduces the overall cost, and has good economy and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the false blade structure of the present invention;

[0024] Figure 2 is a schematic diagram of step S1 of the present invention;

[0025] Figure 3 is a schematic diagram of step S2 of the present invention;

[0026] Figure 4 is a schematic diagram of step S3 of the present invention;

[0027] Figure 5 is a schematic diagram of step S4 of the present invention;

[0028] Figure 6 is a schematic diagram of step S5 of the present invention;

[0029] Figure 7 is a schematic diagram of step S6 of the present invention;

[0030] Figure 8 is a schematic diagram of step S7 of the present invention;

[0031] Fig. 9It is a schematic diagram of step S8 of the present invention.

[0032] Figure numerals: 1-crossbeam, 2-elbow, 3-installation portion, 4-connecting bolt, 5-counterweight.

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0034] Embodiment 1 of the present invention: A false blade for a wind turbine comprises: a cross beam 1, one end of the cross beam 1 is provided with an elbow 2 bent to one side, the end of the elbow 2 away from the cross beam 1 is provided with a mounting portion 3, the end of the mounting portion 3 is provided with a connecting bolt 4, the mounting portion 3 can be installed on the hub blade flange, which is the same as the mounting structure of the blade.

[0035] In the aforementioned fan false blade, a counterweight block 5 is detachably mounted on the other end of the crossbeam 1 , and the mounting position of the counterweight block 5 on the crossbeam 1 is adjustable, and the overall weight and center of gravity position can be adjusted by adjusting the counterweight block 5 .

[0036] In the aforementioned fan false blade, the angle a between the center line of the elbow 2 and the center line of the beam 1 is 150°.

[0037] Embodiment 2 of the present invention: A method for hoisting a single blade of a fan using a false blade, characterized in that it comprises the following steps:

[0038] S1. Install the first blade in a horizontal direction on the first hub blade flange;

[0039] S2. After the first blade is installed and bolts are tightened, the blade clamp is released to hold the blade and the hub brake system is released. The hub rotates freely until the first blade is vertically downward. After locking the hub, the blade clamp is used to hoist the fake blade to the second hub blade flange for installation;

[0040] S3. After the false blades are installed and bolts are tightened, loosen the hub and lift the false blades until the third hub blade flange faces the horizontal direction, lock the hub brake system and yaw the nacelle hub, rotate 180° counterclockwise around the tower, so that the horizontal direction of the third hub blade flange changes from left to right;

[0041] S4. Use the blade clamp to hoist the second blade to the third hub blade flange for installation;

[0042] S5. After installation, loosen the blade clamp, yaw the nacelle hub, and rotate 180° clockwise around the tower;

[0043] S6. Release the wheel hub brake system, and rotate the wheel hub 30° clockwise driven by the motor until the fake blade is horizontal. Lock the wheel hub brake system and then hoist the blade fixture onto the fake blade.

[0044] S7, release the hub brake system, adjust the false blade until the second hub blade flange faces the horizontal direction, and then lock the hub brake system;

[0045] S8. Remove the fake blade, then use the blade clamp to lift the third blade to the second hub blade flange for installation to complete the entire installation.

[0046] Embodiment 3 of the present invention: A method for hoisting a single blade of a fan using a false blade, characterized in that it comprises the following steps:

[0047] S1. After the hub nacelle is hoisted, the hub is rotated by the motor so that the first hub blade flange is in a horizontal direction, the brake system is locked so that the hub can no longer rotate freely, and the first blade is hoisted to a horizontal position using a blade-specific clamp. The blade root bolts are aligned with the hub blade flange bolt holes. After they are fully in place, the bolts are tightened to complete the installation. The first blade is installed in a horizontal direction on the first hub blade flange, so that the first blade is installed in a horizontal direction on the first hub blade flange;

[0048] S2. After the first blade is installed and bolted, the blade clamp is released to hold the blade and the hub brake system is released. The hub rotates freely until the first blade is vertically downward. After locking the hub, the blade clamp is used to hoist the dummy blade to the second hub blade flange for installation. The installation method of the dummy blade is as follows:

[0049] After locking the hub brake system, use the blade lifting fixture to lift the fake blade to the horizontal position on the right side of the hub, align the root bolts of the fake blade with the bolt holes of the second hub blade flange, and tighten the bolts after inserting them into the bolt holes.

[0050] S3. After the false blades are installed and bolts are tightened, loosen the hub and lift the false blades until the third hub blade flange faces the horizontal direction, lock the hub brake system and yaw the nacelle hub, rotate 180° counterclockwise around the tower, so that the horizontal direction of the third hub blade flange changes from left to right;

[0051] S4. Use the blade clamp to hoist the second blade to the third hub blade flange for installation;

[0052] S5. After installation, loosen the blade clamp, yaw the nacelle hub, and rotate 180° clockwise around the tower. The specific method is as follows:

[0053] After loosening the blade clamp, the hoisting crane boom rotates and lies down to avoid the installed blades’ rotation path around the tower, yaws the nacelle hub, and rotates 180° clockwise around the tower;

[0054] S6. Release the wheel hub brake system, and rotate the wheel hub 30° clockwise driven by the motor until the fake blade is horizontal. Lock the wheel hub brake system and then hoist the blade fixture onto the fake blade.

[0055] S7, release the hub brake system, adjust the false blade until the second hub blade flange faces the horizontal direction, and then lock the hub brake system;

[0056] S8. Remove the fake blade, then use the blade clamp to lift the third blade to the second hub blade flange for installation to complete the entire installation.

[0057] Specifically, before the fake blade is used, the weight and position of the counterweight of the fake blade are adjusted so that the overall weight of the fake blade is the same as that of a blade, and the distance between the center of gravity and the root hub flange surface is the same as that of the blade, that is, the generated torque is the same.

[0058] The working principle of an embodiment of the present invention: In the present invention, the overall weight of the fake blade is the same as the weight of a blade, and the distance between the center of gravity and the root hub flange surface is the same as that of the blade, that is, the generated torque is the same, and the overall weight and the center of gravity position can be adjusted by adjusting the weight and position of the counterweight. By utilizing fake blades, the wind turbine can still achieve single-blade lifting without a turning system. Under the premise that the wind turbine has no turning system or the torque provided by the turning system does not meet the single-blade lifting process, the "fake blades" are used to achieve single-blade lifting of the wind turbine, thereby reducing the requirements for the lifting ship and the window period.

Claims

1. A fan false blade, characterized in that: include: A crossbeam, wherein one end of the crossbeam is provided with an elbow bent to one side, an end of the elbow away from the crossbeam is provided with a mounting portion, and the end of the mounting portion is provided with a connecting bolt.

2. A fan false blade according to claim 1, characterized in that: A counterweight block is detachably mounted on the other end of the crossbeam, and the mounting position of the counterweight block on the crossbeam can be adjusted.

3. A fan false blade according to claim 1, characterized in that: The angle a between the center line of the elbow and the center line of the beam is 150°.

4. A method for hoisting a single blade of a fan using a false blade, characterized in that: The following steps are involved: S1. Install the first blade in a horizontal direction on the first hub blade flange; S2. After the first blade is installed and bolts are tightened, the blade clamp is released to hold the blade and the hub brake system is released. The hub rotates freely until the first blade is vertically downward. After locking the hub, the blade clamp is used to hoist the fake blade to the second hub blade flange for installation; S3. After the false blades are installed and bolts are tightened, loosen the hub and lift the false blades until the third hub blade flange faces the horizontal direction, lock the hub brake system and yaw the nacelle hub, rotate 180° counterclockwise around the tower, so that the horizontal direction of the third hub blade flange changes from left to right; S4. Use the blade clamp to hoist the second blade to the third hub blade flange for installation; S5. After installation, loosen the blade clamp, yaw the nacelle hub, and rotate 180° clockwise around the tower; S6. Release the wheel hub brake system, and rotate the wheel hub 30° clockwise driven by the motor until the fake blade is horizontal. Lock the wheel hub brake system and then hoist the blade fixture onto the fake blade. S7, release the hub brake system, adjust the false blade until the second hub blade flange faces the horizontal direction, and then lock the hub brake system; S8. Remove the fake blade, then use the blade clamp to lift the third blade to the second hub blade flange for installation to complete the entire installation.

5. A method for hoisting a single blade of a fan using a false blade according to claim 4, characterized in that: In step S1, after the hub nacelle is hoisted, the hub is rotated by the motor so that the first hub blade flange is horizontally oriented, the brake system is locked so that the hub can no longer rotate freely, and the first blade is hoisted to a horizontal position using a blade-specific clamp, the blade root bolt is aligned with the hub blade flange bolt hole, and after it is fully in place, the bolts are tightened to complete.

6. A method for hoisting a single blade of a fan using a false blade according to claim 4, characterized in that: The installation method of the false blade in step S2 is as follows: after locking the hub brake system, use the blade lifting fixture to lift the false blade to the horizontal position on the right side of the hub, align the root bolt of the false blade with the bolt hole of the second hub blade flange, and tighten the bolt after inserting it into the bolt hole.

7. A method for hoisting a single blade of a fan using a false blade according to claim 4, characterized in that: In step S5, after the blade clamp is released, the hoisting crane boom is rotated and bent to avoid the rotation path of the installed blades around the tower, and the nacelle hub is yawed and rotated 180° clockwise around the tower.

8. The method for hoisting a single blade of a fan using a false blade according to claim 4, characterized in that: Before using the fake blade, the weight and position of the counterweight block are adjusted so that the overall weight of the fake blade is the same as that of a blade, and the distance between the center of gravity and the root hub flange surface is the same as that of the blade.