A constant-tension traction device and traction method for installing offshore wind turbine blades

Abstract

This invention relates to a constant-tension traction device and method for installing offshore wind turbine blades. The traction device includes multiple steel wire ropes evenly arranged around the blade tip and a traction drive device. One end of each steel wire rope is fixed to a corresponding blade bolt, and the other end of each steel wire rope passes through a corresponding hub bolt hole from the outside in. The traction drive device is located inside the hub and fixed to the other end of the steel wire ropes. When the traction drive device pulls the steel wire ropes, the steel wire ropes pull the blade towards the hub, drawing the blade bolts onto the blade into the hub bolt holes. By using circumferentially evenly distributed, equal-length steel wire ropes spirally wound, constant-tension active traction of the wind turbine blades is achieved. This effectively reduces the impact of sea conditions on wind turbine blade installation, solves the problem of misalignment between the blade bolts and hub bolt holes, and ensures smooth alignment of the blade bolts and hub bolt holes during wind turbine blade installation.

Description

Technical Field

[0001] This invention relates to the field of offshore wind turbine hoisting technology, specifically to a constant tension traction device and traction method for installing offshore wind turbine blades. Background Technology

[0002] With the continued growth of global demand for renewable energy, offshore wind power has become one of the key ways to meet future energy needs. The installation phase of offshore wind turbines is a crucial link in their entire lifecycle, characterized by high costs and complex technology. Especially in harsh sea conditions, the installation process is fraught with challenges and risks. Therefore, how to improve installation efficiency and reduce costs while ensuring safety has become a critical issue that urgently needs to be addressed in the field of offshore wind turbine installation technology.

[0003] Currently, offshore wind turbines are primarily installed using a split-type hoisting method. The blades are typically inserted into the hub from top to bottom at an angle or horizontally using clamps. Each blade has multiple blade bolts at its end, and the corresponding hub has multiple hub bolt holes. When assembling the turbine blades with the hub, each blade bolt must be inserted into one of the corresponding hub bolt holes. The entire installation process is highly dependent on the real-time adjustments made by the crane operator.

[0004] However, this installation method suffers from poor positioning accuracy and low installation efficiency. In addition, the construction window is short, it is easily affected by sea conditions, and the installation process is relatively passive.

[0005] Therefore, people hope to develop a traction device for the installation of offshore wind turbine blades to assist in the smooth installation of offshore wind turbine blades and improve installation efficiency. Summary of the Invention

[0006] To address the problems existing in the prior art, the purpose of this invention is to provide a constant tension traction device and traction method for the installation of offshore wind turbine blades, which can achieve constant tension traction of wind turbine blades and ensure smooth connection between blade bolts and hub bolt holes during the wind turbine blade hoisting process.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A constant tension traction device for installing offshore wind turbine blades includes multiple steel wire ropes evenly arranged around the blade tip and a traction drive device.

[0009] One end of each of the multiple steel wire ropes is fixed to one of the multiple blade bolts of the blade, and the other end of each of the multiple steel wire ropes is passed through one of the multiple hub bolt holes of the hub from the outside to the inside.

[0010] The traction drive device is located inside the wheel hub and fixed to the other end of the wire rope;

[0011] When the traction drive device pulls the wire rope, the wire rope pulls the blades towards the hub, pulling the blade bolts on the blades into the hub bolt holes of the hub.

[0012] Furthermore, the traction drive device includes a motor and a rotating drum, the rotating drum being rotatably connected to the hub, and the outer circumference of the rotating drum being connected to the wire rope; the motor is fixed to the hub and connected to the rotating drum, and is used to drive the rotating drum to rotate so that the wire rope is wound around the rotating drum.

[0013] Furthermore, multiple lifting lugs are evenly distributed around the outer circumference of the rotating drum. These lugs are located on the side of the rotating drum away from the blades, and multiple steel wire ropes of the same length are connected to multiple hooks one by one.

[0014] Furthermore, the rotation axis of the drum is aligned with the center of the hub.

[0015] Furthermore, the traction drive device also includes a transmission device, with its two ends connected to the motor and the drum, respectively.

[0016] Furthermore, the traction drive device also includes a support assembly, to which the motor is fixed. The support assembly has holes at different heights, and the rotating drum is rotatably connected to any hole.

[0017] A method for constant tension traction for installing offshore wind turbine blades includes the following steps:

[0018] Multiple steel wire ropes are evenly looped around the end of the blade. One end of each steel wire rope is fixed to one of the multiple blade bolts on the blade, and the other end of each steel wire rope is passed through one of the multiple hub bolt holes on the hub from the outside to the inside.

[0019] The traction drive device is located inside the wheel hub and fixed to the other end of the wire rope;

[0020] The traction drive device pulls the steel wire rope, causing the steel wire rope to pull the blade towards the hub, thus pulling the blade bolts on the blade into the hub bolt holes of the hub.

[0021] Furthermore, the method of using a traction drive device to pull the wire rope is as follows: the motor drives the drum to rotate, the rotation of the drum causes the wire rope to wind around the drum, so that the wire rope is tightened and the blades move towards the hub.

[0022] Furthermore, the tension value of the wire rope is obtained as follows: the blade offset includes horizontal offset around the Y-axis in the XZ plane, vertical offset around the X-axis in the YZ plane, and circular offset around the Z-axis in the XY plane.

[0023] Wind pressure per unit area:

[0024] In the formula, ρ αair density, Let Z be the average wind speed at height Z within the average time interval T.

[0025] The total force exerted on an object by wind pressure:

[0026] In the formula, C Z C is the height coefficient of the wind-receiving structure. S A is the component shape factor. N The frontal area of ​​the stressed component;

[0027] When the wind-receiving area is asymmetrical and there is a certain distance between the centroid and the center of gravity of the overall wind-receiving area, the wind force has a torque effect in three directions:

[0028]

[0029] M XW =F YW (C YB -C YG )

[0030] M YW =F XW (C XB -C XG )

[0031] In the formula, ρ is the air density; M XW M YW M ZW F represents the torque along the X-axis, Y-axis, and Z-axis, respectively. XWi Indicates wind force in the X and Y axes; D Xi D Yi Indicates the corresponding lever arm; U represents wind speed; F represents wind speed. XW F YW These represent the wind force components along the X and Y axes, respectively; C XB C YB C is the location of the centroid of the wind-receiving area. XG C YG As a reference point, it refers to the position of the overall center of gravity of the structure;

[0032] Horizontal offset around the Y-axis in the XZ plane:

[0033] The blade is horizontally offset around the Y-axis in the XZ plane, with an offset angle of α.

[0034] The corrective torque is the component F of the wire rope along the X-axis. x offset:

[0035] In the formula, R is the blade radius, which is the distance from the center of the hub to the point of action of the wire rope;

[0036] The component of force borne by each wire rope in the X-axis direction:

[0037] In the formula, n is the number of wire ropes; δ is the angle between the wire rope and the vertical direction;

[0038] The total tension of a single wire rope is:

[0039] Vertical offset around the X-axis in the YZ plane:

[0040] The blade is vertically offset around the X-axis in the YZ plane, with an offset angle of β;

[0041] The corrective torque is the component F of the wire rope along the Z-axis. Z offset:

[0042] The component of force borne by each wire rope in the Z-axis direction:

[0043] The total tension of a single wire rope is:

[0044] Circular offset around the Z-axis in the XY plane:

[0045] The blade is circularly offset around the Z-axis in the XY plane, with an offset angle of γ;

[0046] The corrective torque is the radial component F of the wire rope. r offset:

[0047] The component of force borne by each wire rope in the Z-axis direction:

[0048] The total tension of a single wire rope is:

[0049] Furthermore, when all three types of offsets exist simultaneously, the total tension of the wire rope needs to simultaneously counteract the torques caused by wind loads in each plane.

[0050] X-direction component:

[0051] Z-direction component:

[0052] Radial component:

[0053] Total tension of a single wire rope:

[0054]

[0055] Tension of all wire ropes: T 总=n·T 单根 .

[0056] In summary, the present invention has the following advantages:

[0057] This invention uses circumferentially distributed, equal-length steel wire ropes for spiral winding to achieve equal tensile traction of the wind turbine blades. The structure is compact and reasonable, which can effectively reduce the impact of sea conditions on the hoisting of wind turbine blades, solve the problem of misalignment between wind turbine blade bolts and hub bolt holes, achieve active traction, and ensure smooth connection between blade bolts and hub bolt holes during the hoisting process of wind turbine blades. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the traction drive device according to an embodiment of the present invention.

[0059] Figure 2 for Figure 1 A magnified view of section I shown.

[0060] Figure 3 This is a front structural diagram of the traction drive device according to an embodiment of the present invention.

[0061] Figure 4 for Figure 3 A magnified view of section II shown.

[0062] Figure 5 for Figure 3 A magnified view of section III shown.

[0063] Figure 6 for Figure 3 A magnified view of a portion of point IV shown.

[0064] Figure 7 This is a schematic diagram of the overall assembly of an embodiment of the present invention.

[0065] Figure 8 This is a schematic diagram showing the state of the wire rope wound on the drum.

[0066] Figure 9 These are three scenarios where the wind turbine blades may shift.

[0067] In the picture:

[0068] 1-Traction drive device, 2-Hub, 3-Wind turbine blade, 10-Support assembly, 101-Left bracket, 102-Fixing plate, 103-Right bracket, 104-Motor support plate, 105-Support block, 106-L-shaped angle bracket, 11-Rotating assembly, 111-Rotating component, 112-Wire rope, 113-Bracket sleeve, 114-Fixing component, 115-Bracket bearing, 1161-Left positioning sleeve, 1162-Right positioning sleeve, 117-Hook, 118-Rope clip, 12-Transmission assembly, 121-Upper sprocket, 122-Chain, 123-Lower sprocket, 124-Motor, 125-Key. Detailed Implementation

[0069] The present invention will now be described in further detail.

[0070] Example 1

[0071] This embodiment provides a constant tension traction device for installing offshore wind turbine blades, including multiple steel wire ropes 112 evenly arranged around the blade ends and a traction drive device 1;

[0072] One end of each of the multiple steel wire ropes 112 is fixed to one of the multiple blade bolts of the blade, and the other end of each of the multiple steel wire ropes 112 is passed through one of the multiple hub bolt holes of the hub 2 from the outside to the inside.

[0073] The traction drive device 1 is located inside the wheel hub 2 and is fixed to the other end of the wire rope 112;

[0074] When the traction drive device 1 pulls the wire rope 112, the wire rope 112 pulls the blade towards the hub 2, and pulls the blade bolt on the blade into the hub bolt hole of the hub 2.

[0075] Specifically, such as Figure 1 and Figure 2 As shown, the traction drive device 1 includes: a support assembly 10, a rotating assembly 11, and a transmission assembly 12.

[0076] like Figure 1-Figure 5 As shown, the support assembly 10 includes a left bracket 101, a fixing plate 102, a right bracket 103, a motor support plate 104, a support block 105, and an L-shaped corner bracket 106.

[0077] The rotating assembly 11 includes a rotating component 111, a bracket sleeve 113, a fixing component 114, a bracket bearing 115, a left positioning sleeve 1161, a right positioning sleeve 1162, a hook 117, and a rope clip 118.

[0078] The transmission assembly 12 includes an upper sprocket 121, a chain 122, a lower sprocket 123, and a motor 124. The chain 122 and sprocket can be replaced with a timing belt and timing pulley or gears. For simplicity, only chain drive is shown here.

[0079] like Figure 4 As shown, the upper sprocket 121 and the rotating component 111 are connected by a key 125 to achieve circumferential positioning; as Figure 5 As shown, the lower sprocket 123 is connected to the motor 124 by a key 125.

[0080] When installing the chain 122 or timing belt of the transmission device, attention should be paid to the tightness to prevent the traction device from falling off during the rotation of the wheel hub 2.

[0081] The rotating component 111 includes a rotating cylinder with circumferentially evenly distributed lifting lugs welded on it for connecting to the hook 117. The number of lifting lugs is adjusted according to the number of hub bolt holes and the diameter of the rotating cylinder.

[0082] The motor support plate 104 is fixed to the appropriate position of the bracket by the L-shaped corner bracket 106. The motor 124 is fixed to the motor support plate 104 by bolts. The wire rope 112 is fixed by the rope clip 118 and then hung at the hook 117. The wire rope 112 needs to pass through the hollow positioning pin and hub bolt hole on the fan blade 3 first.

[0083] like Figure 4 and Figure 5 As shown, the shaft of the rotating component 111 is supported by a bracket bearing 115. The bracket bearing 115 positions the outer ring of the bearing through a stepped hole inside the bracket sleeve 113, and positions the inner ring of the bearing through a positioning sleeve and a fixing component 114. The bracket sleeve 113 and the bracket are connected together by welding.

[0084] The left bracket 101, the right bracket 103 and the fixing plate 102 are connected by bolts.

[0085] Further, such as Figure 1 As shown, support blocks 105 are installed in the steel pipes at the bottom of the left support 101 and the right support 103 to reinforce the support frame.

[0086] Furthermore, the installation of the fixing plate 102 needs to take into account the internal structure of the fan. At the same time, the distance between the fixing plate 102 and the center of the hub 2 needs to be measured in advance before installation, and the height of the bracket needs to be adjusted accordingly based on the distance. Meanwhile, circumferential positioning is performed through the holes on the fixing plate 102 to ensure that the center of the rotating drum is aligned with the center of the hub 2.

[0087] Specifically, such as Figure 1As shown, the left bracket 101 and the right bracket 103 are provided with multiple holes, so different holes can be selected to adjust the height of the rotating part 111 and the motor support plate 104.

[0088] Furthermore, the support assembly 10 can be detached and fixed according to the internal space of the hub 2, including drilling holes in existing components in the hub 2 to install the rotating assembly 11 and the transmission assembly 12.

[0089] like Figure 6 As shown, the wire rope 112 has markings to ensure that the lengths of the wire rope 112 from the hook 117 to the hollow positioning pin are equal during installation.

[0090] like Figure 7 The figure shows a three-dimensional structural diagram of an equal tension traction device for offshore wind turbine blade installation provided by an embodiment of the present invention during blade docking. For simplification, only the connection of one steel wire rope 112 is shown. At the same time, to clearly show the connection of the traction device, only part of the hub 2 is shown. The dotted line in the figure represents the state in which the blade is offset due to the influence of sea conditions.

[0091] like Figure 7 and Figure 8 As shown, under the rotation of motor 124, the drive shaft and rotating component 111 rotate synchronously. The wire rope 112 connected to the rotating component 111 via hook 117 rotates accordingly. The evenly distributed wire rope 112 spirally winds around the rotating drum. When the blade is misaligned due to sea conditions, the combined action of multiple wire ropes 112 can drive the blade to rotate until the blade bolt and hub bolt hole are aligned. At the same time, the length of the wire rope 112 continuously decreases during the winding process, which will drive the blade to move axially, thus achieving smooth docking of the blade bolt and hub bolt hole.

[0092] Furthermore, after the blade bolts and hub bolt holes are aligned, the force of the wire rope 112 along the axial direction is balanced, and it will no longer drive the blade to rotate. After positioning is completed, the wire rope 112 can be removed from the hook 117 for disassembly.

[0093] Example 2

[0094] This embodiment provides a constant tension traction method for installing offshore wind turbine blades, including the following steps:

[0095] Multiple steel wire ropes 112 are evenly looped around the end of the blade. One end of each steel wire rope 112 is fixed to one of the multiple blade bolts of the blade, and the other end of each steel wire rope 112 is passed through one of the multiple hub bolt holes of the hub 2 from the outside to the inside.

[0096] The traction drive device 1 is located inside the wheel hub 2 and is fixed to the other end of the wire rope 112;

[0097] Using the traction drive device 1 to pull the wire rope 112, the wire rope 112 pulls the blade towards the hub 2, and pulls the blade bolt on the blade into the hub bolt hole of the hub 2.

[0098] The specific steps are as follows:

[0099] S1. Before hoisting the wind turbine blades 3, install equal tension traction devices according to the designed hole positions and number of blades;

[0100] S2. The crane lifts the fan blades 3. Under the adjustment of the operator, the blade bolts and hub bolt holes are initially positioned. Direct docking is not required.

[0101] S3. The operator passes the steel wire rope 112 through the hollow positioning pin through the corresponding hole of the hub 2, then fixes the steel wire rope 112, and finally hangs the fixed steel wire rope 112 on the hook 117.

[0102] S4. Connect the power supply to motor 124. The traction device starts working. The wire rope 112 drives the blade to move until positioning is completed.

[0103] S5. After positioning is completed, the traction device is turned off, the operator controls the crane to move the blades, and the staff assembles them;

[0104] S6. Rotate hub 2 to the appropriate installation position, and repeat S2 to S5 until the installation of the three blades is completed.

[0105] Example 3

[0106] This embodiment provides a method for aligning offshore wind turbine blades and hubs. This method can be used in the initial alignment process during the hoisting of wind turbine blades 3, achieving preliminary positioning of blade bolts and hub bolt holes, as detailed below:

[0107] S1. A laser emitter is installed at one end of the rotating part 111 of the traction drive device 1 near the blade, and a laser receiver is installed at the center of the blade.

[0108] S2. When the operator operates the crane to lift the blade, the laser emitter is turned on when the blade bolt is close to the hub bolt hole.

[0109] S3. The operator makes real-time adjustments until the laser receiver receives the signal and transmits the information to the crane, completing the initial positioning of the blade bolts and hub bolt holes.

[0110] Example 4

[0111] This embodiment provides a method for calculating the tension of the wire rope 112 in a constant tension traction device for offshore wind turbine blade installation. The method is applied in Embodiment 1, as follows:

[0112] like Figure 9 The diagram shows three cases of wind turbine blade 3 being offset: Case 1, horizontal offset around the Y-axis in the XZ plane; Case 2, vertical offset around the X-axis in the YZ plane; and Case 3, circular offset around the Z-axis in the XY plane.

[0113] Wind pressure per unit area:

[0114]

[0115] In the formula, ρ α air density, Let Z be the average wind speed at height Z within the average time interval T.

[0116] The total force exerted on an object by wind pressure:

[0117]

[0118] In the formula, C Z C is the height coefficient of the wind-receiving structure. S A is the component shape factor. N This refers to the windward area of ​​the stressed component.

[0119] When the wind-receiving area is asymmetrical and there is a certain distance between the centroid and the center of gravity of the overall wind-receiving area, the wind force has a torque effect in three directions:

[0120]

[0121] M XW =F YW (C YB -C YG ) (4)

[0122] M YW =F XW (C XB -C XG (5)

[0123] In the formula, ρ is the air density; M XW M YW M ZW F represents the torque along the X-axis, Y-axis, and Z-axis, respectively. XWi Indicates wind force in the X and Y axes; D Xi D Yi Indicates the corresponding lever arm; U represents wind speed; F represents wind speed. XW F YWThese represent the wind force components along the X and Y axes, respectively; C XB C YB C is the location of the centroid of the wind-receiving area. XG C YG The reference point refers to the location of the overall center of gravity of the structure.

[0124] Case 1

[0125] The blade is horizontally offset around the Y-axis in the XZ plane, with an offset angle of α.

[0126] The corrective torque is the component F of the steel wire rope 112 along the X-axis. x offset:

[0127]

[0128] In the formula, R is the blade radius, which is the distance from the center of hub 2 to the point of action of wire rope 112.

[0129] The force component along the X-axis borne by each wire rope is 112 parts:

[0130]

[0131] In the formula, n is the number of wire ropes 112; δ is the angle between the wire ropes 112 and the vertical direction.

[0132] The total tension of a single steel wire rope 112 is:

[0133]

[0134] Case 2

[0135] The blade is vertically offset around the X-axis in the YZ plane, with an offset angle of β.

[0136] The corrective torque is the Z-axis component F of the wire rope 112. Z offset:

[0137]

[0138] The Z-axis force component of each wire rope is 112 parts:

[0139]

[0140] The total tension of a single steel wire rope 112 is:

[0141]

[0142] Case 3

[0143] The blade is circumferentially offset around the Z-axis in the XY plane, with an offset angle of γ.

[0144] like Figure 9 As shown, the bolt hole that was originally at point A has been moved to point B due to offset.

[0145] The correcting torque is the radial component F of the wire rope 112. r offset:

[0146]

[0147] The Z-axis force component of each wire rope is 112 parts:

[0148]

[0149] The total tension of a single steel wire rope 112 is:

[0150]

[0151] When all three types of offsets exist simultaneously, the total tension of the wire rope 112 needs to simultaneously counteract the torque caused by the wind load in each plane.

[0152] X-direction component (Case 1):

[0153]

[0154] Z-direction component (Case 2):

[0155]

[0156] Radial component (Case 3):

[0157]

[0158] Total tensile force of a single steel wire rope: 112

[0159]

[0160] The tension of all 112 steel wire ropes:

[0161] T 总 =n·T 单根 (19)

[0162] By calculating the tension of the wire rope 112, a suitable wire rope 112 can be selected when traction and installation of the wind turbine blades 3, thus avoiding accidents during the installation process.

[0163] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A method for equal-tension traction for installing offshore wind turbine blades, characterized in that: A constant tension traction device for installing offshore wind turbine blades is adopted. The equal tension traction device includes multiple steel wire ropes evenly arranged around the ends of the blades and a traction drive device; One end of each of the multiple steel wire ropes is fixed to one of the multiple blade bolts of the blade, and the other end of each of the multiple steel wire ropes is passed through one of the multiple hub bolt holes of the hub from the outside to the inside. The traction drive device is located inside the wheel hub and fixed to the other end of the wire rope; When the traction drive device pulls the wire rope, the wire rope pulls the blades toward the hub, pulling the blade bolts on the blades into the hub bolt holes of the hub. The traction drive device includes a motor and a rotating drum. The rotating drum is rotatably connected to the hub, and a wire rope is connected to the outer circumference of the rotating drum. The motor is fixed to the hub and connected to the rotating drum, and is used to drive the rotating drum to rotate so that the wire rope is wound around the rotating drum. The outer circumference of the rotating drum is evenly provided with multiple lifting lugs, which are located on the side of the rotating drum away from the blades. The lifting lugs are connected to hooks, and multiple steel wire ropes are connected to the hooks one by one. The rotation axis of the drum is aligned with the center of the hub; The traction drive device also includes a transmission device, the two ends of which are connected to a motor and a drum, respectively; The traction drive device also includes a support assembly, to which the motor is fixedly connected. The support assembly has holes at different heights, and the rotating drum is rotatably connected to any hole. Includes the following steps, Multiple steel wire ropes are evenly looped around the end of the blade. One end of each steel wire rope is fixed to one of the multiple blade bolts on the blade, and the other end of each steel wire rope is passed through one of the multiple hub bolt holes on the hub from the outside to the inside. The traction drive device is located inside the wheel hub and fixed to the other end of the wire rope; The traction drive device pulls the steel wire rope, causing the steel wire rope to pull the blade towards the hub, thereby pulling the blade bolts on the blade into the hub bolt holes of the hub. The method of using a traction drive device to pull the wire rope is as follows: the motor drives the drum to rotate, the rotation of the drum causes the wire rope to wind around the drum, so that the wire rope is tightened and the blades are moved towards the hub.

2. The equal tension traction method according to claim 1, characterized in that: The tension value of the wire rope is obtained as follows: the blade offset includes the horizontal offset around the Y-axis in the XZ plane, the vertical offset around the X-axis in the YZ plane, and the circular offset around the Z-axis in the XY plane. Wind pressure per unit area: ; In the formula, air density, Let Z be the average wind speed at height Z within the average time interval T. The total force exerted on an object by wind pressure: In the formula, This is the height coefficient of the wind-receiving structure. The component shape factor, The frontal area of ​​the stressed component; When the wind-receiving area is asymmetrical and there is a certain distance between the centroid and the center of gravity of the overall wind-receiving area, the wind force has a torque effect in three directions: In the formula, air density; , , These represent the torques along the X-axis, Y-axis, and Z-axis, respectively. This indicates wind force in the X and Y axes; , Indicate the corresponding lever arm; Indicates wind speed; , These represent the wind force components along the X and Y axes, respectively. , This is the location of the centroid of the wind-receiving area; , As a reference point, it refers to the position of the overall center of gravity of the structure; Horizontal offset around the Y-axis in the XZ plane: The blade is horizontally offset around the Y-axis in the XZ plane, with an offset angle of θ. ; The corrective torque is the component of the wire rope along the X-axis. offset: ; In the formula, R is the blade radius, which is the distance from the center of the hub to the point of action of the wire rope; The component of force borne by each wire rope in the X-axis direction: ; In the formula, n is the number of wire ropes; The angle between the wire rope and the vertical direction; The total tension of a single wire rope is: ; Vertical offset around the X-axis in the YZ plane: The blade is perpendicularly offset around the X-axis in the YZ plane, with an offset angle of θ. ; The corrective torque is canceled out by the Z-axis component of the wire rope: ; The component of force borne by each wire rope in the Z-axis direction: ; The total tension of a single wire rope is: ; Circular offset around the Z-axis in the XY plane: The blade is circularly offset about the Z-axis in the XY plane, with an offset angle of θ. ; The corrective torque is offset by the radial component of the wire rope: ; The component of force borne by each wire rope in the Z-axis direction: ; The total tension of a single wire rope is: .

3. The equal tension traction method according to claim 2, characterized in that: When all three types of offsets exist simultaneously, the total tension of the wire rope needs to simultaneously counteract the torque caused by the wind load in each plane. X-direction component: ; Z-direction component: ; Radial component: ; Total tension of a single wire rope: The tension of all wire ropes: .

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