Equal-tension traction device and traction method for mounting offshore wind turbine blades

Abstract

The invention relates to an equal-tension traction device and traction method for mounting an offshore wind turbine blade. The traction device comprises a plurality of steel wire ropes and a traction driving device, wherein the steel wire ropes are uniformly and annularly arranged at the end part of the blade; one ends of the steel wire ropes are fixedly connected to the blade bolts of the blades in a one-to-one correspondence mode, and the other ends of the steel wire ropes penetrate through the hub bolt holes of the hub in a one-to-one correspondence mode from outside to inside. The traction driving device is arranged in the hub and is fixedly connected to the other end of the steel wire rope; when the traction driving device pulls the steel wire rope, the steel wire rope pulls the blades to move towards the hub, and blade bolts on the blades are pulled into hub bolt holes of the hub. Steel wire ropes which are evenly distributed in the circumferential direction and equal in length are adopted for spiral winding, equal-tension active traction of the fan blade is achieved, the influence of sea conditions on fan blade hoisting can be effectively reduced, the problem that fan blade bolts and hub bolt holes are staggered is solved, and it is guaranteed that the blade bolts and the hub bolt holes are in smooth butt joint in the fan blade hoisting process.

Description

Technical Field

[0001] The invention relates to the technical field of offshore wind turbine hoisting, and in particular to an equal-tension traction device and a traction method for installing offshore wind turbine blades. Background Art

[0002] As the global demand for renewable energy continues to grow, offshore wind power has become one of the key ways to meet future energy needs. The installation phase of offshore wind power is an extremely critical part of the entire life cycle of wind turbines. It is costly and technically complex. Especially in harsh sea conditions, the installation process is full of challenges and risks. Therefore, how to improve installation efficiency and reduce costs while ensuring safety has become an important issue that needs to be solved in the current offshore wind power hoisting technology field.

[0003] At present, the installation method of offshore wind turbines is mainly split-type hoisting. The blades are usually inserted into the hub from top to bottom or horizontally through a clamp. There are multiple blade bolts at the end of the wind turbine blade, and multiple hub bolt holes are provided at the corresponding positions of the hub. When the wind turbine blades are docked with the hub, the multiple blade bolts need to be inserted into the multiple hub bolt holes one by one. The entire installation process is highly dependent on the real-time adjustment of the crane operator.

[0004] However, this installation method has problems such as poor positioning accuracy and low installation efficiency. At the same time, 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 installing offshore wind turbine blades to assist in the smooth installation of offshore wind turbine blades and improve installation efficiency. Summary of the invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide an equal-tension traction device and a traction method for installing offshore wind turbine blades, which can achieve equal-tension traction of wind turbine blades and ensure smooth docking of blade bolts and hub bolt holes during wind turbine blade lifting.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] An equal-tension traction device for installing offshore wind turbine blades, comprising a plurality of steel wire ropes uniformly looped around the ends of the blades and a traction drive device;

[0009] One ends of the plurality of steel wires are fixed to the plurality of blade bolts of the blades one by one, and the other ends of the plurality of steel wires are passed through the plurality of hub bolt holes of the hub from outside to inside one by one;

[0010] The traction drive device is arranged in the wheel hub and fixedly connected to the other end of the wire rope;

[0011] When the traction drive device pulls the steel wire rope, the steel wire rope pulls the blade to move toward the hub, and pulls the blade bolt on the blade into the hub bolt hole of the hub.

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

[0013] Furthermore, a plurality of lifting ears are evenly arranged on the outer circumference of the rotating drum, and the plurality of lifting ears are arranged on a side of the rotating drum away from the blades. The plurality of steel wire ropes have the same length and are respectively connected to the plurality of hooks in a one-to-one correspondence.

[0014] Further, 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, and two ends of the transmission device are respectively connected to the motor and the drum.

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

[0017] An equal-tension traction method for installing offshore wind turbine blades comprises the following steps:

[0018] A plurality of steel wire ropes are evenly looped around the ends of the blades, one end of the plurality of steel wire ropes is respectively fixed to a plurality of blade bolts of the blades correspondingly, and the other ends of the plurality of steel wire ropes are respectively passed through a plurality of hub bolt holes respectively from outside to inside correspondingly;

[0019] The traction drive device is arranged in the wheel hub and fixedly connected to the other end of the wire rope;

[0020] The traction drive device is used to pull the wire rope, so that the wire rope pulls the blade to move toward the hub, and the blade bolts on the blade are pulled into the hub bolt holes of the hub.

[0021] Furthermore, the traction drive device is used to pull the wire rope by driving the drum to rotate through a motor, and the rotation of the drum drives the wire rope to be wound around the drum, so that the wire rope is tightened and drives the blade to move toward the hub.

[0022] Furthermore, 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 circumferential offset around the Z axis in the XY plane.

[0023] Wind pressure per unit area:

[0024] In the formula, ρ αis the air density, is the average wind speed corresponding to the height Z during the average time T;

[0025] The total force acting on the object due to wind pressure is:

[0026] In the formula, C Z is the wind-exposed structure height coefficient, C S is the component shape factor, A N is the windward area of ​​the load-bearing component;

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

[0028]

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

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

[0031] Where ρ is the air density; M XW 、M YW 、M ZW Respectively represent the moments along the X-axis, Y-axis, and Z-axis; F XWi Indicates the wind force in the X-axis and Y-axis directions; D Xi , D Yi represents the corresponding lever arm; U represents the wind speed; F XW 、F YW Represents the wind force components in the X-axis and Y-axis directions respectively; C XB , C YB is the centroid position of the wind-exposed area; C XG , C YG It is the reference point, which refers to the position of the center of gravity of the structure as a whole;

[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 correction torque is composed of the X-axis force F of the wire rope x offset:

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

[0036] The X-axis force shared by each wire rope:

[0037] Where 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] The 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 correction torque is composed of the Z-axis force F of the wire rope Z offset:

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

[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 circumferentially offset around the Z axis in the XY plane, with an offset angle of γ;

[0046] The correction torque is composed of the radial force F of the wire rope r offset:

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

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

[0049] Furthermore, when the three offsets exist simultaneously, the total tension of the wire rope needs to simultaneously offset the moments caused by the wind load in each plane;

[0050] X-direction force:

[0051] Force component in Z direction:

[0052] Radial force component:

[0053] Total tension of a single wire rope:

[0054]

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

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

[0057] The present invention uses circumferentially evenly distributed and equal-length steel wire ropes for spiral winding to achieve equal-tensile traction of wind turbine blades. The present invention has a compact and reasonable structure, can effectively reduce the influence of sea conditions on the hoisting of wind turbine blades, solve the problem of misalignment of wind turbine blade bolts and hub bolt holes, achieve active traction, and ensure that the blade bolts and hub bolt holes are smoothly docked during the hoisting of the wind turbine blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 Schematic diagram of the structure of a traction drive device according to an embodiment of the present invention.

[0059] Figure 2 for Figure 1 A partial enlarged view of point Ⅰ is shown.

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

[0061] Figure 4 for Figure 3 A local enlarged view of point Ⅱ is shown.

[0062] Figure 5 for Figure 3 A local enlarged view of point III is shown.

[0063] Figure 6 for Figure 3 A local enlarged view of point IV is shown.

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

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

[0066] Fig. 9 There are three situations in which fan blades may be offset.

[0067] In the figure:

[0068] 1-traction drive device, 2-wheel hub, 3-fan blades, 10-support assembly, 101-left bracket, 102-fixed plate, 103-right bracket, 104-motor support plate, 105-support block, 106-L-shaped angle code, 11-rotating assembly, 111-rotating part, 112-wire rope, 113-bracket sleeve, 114-fixed part, 115-bracket bearing, 1161-left positioning sleeve, 1162-right positioning sleeve, 117-hook, 118-rope clamp, 12-transmission assembly, 121-upper sprocket, 122-chain, 123-lower sprocket, 124-motor, 125-key. DETAILED DESCRIPTION

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

[0070] Example 1

[0071] This embodiment provides an equal-tension traction device for installing offshore wind turbine blades, comprising a plurality of steel wire ropes 112 uniformly arranged around the ends of the blades and a traction drive device 1;

[0072] One ends of the plurality of steel wires 112 are fixed to the plurality of blade bolts of the blades one by one, and the other ends of the plurality of steel wires 112 are passed through the plurality of hub bolt holes of the hub 2 from outside to inside one by one;

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

[0074] When the traction drive device 1 pulls the steel wire rope 112 , the steel wire rope 112 pulls the blade to move toward the hub 2 , and pulls the blade bolts on the blade into the hub bolt holes of the hub 2 .

[0075] Specifically, Figure 1 and Figure 2 As shown, the traction drive device 1 includes: a supporting 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 angle code 106;

[0077] The rotating assembly 11 includes a rotating member 111, a bracket sleeve 113, a fixing member 114, a bracket bearing 115, a left positioning sleeve 1161, a right positioning sleeve 1162, a hook 117 and a rope clamp 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 the sprocket can be replaced by a synchronous belt and a synchronous pulley or a gear. For simplified representation, only the chain transmission mode is shown here.

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

[0080] When installing the chain 122 or synchronous 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 member 111 includes a rotating drum, and the rotating drum is welded with hanging ears evenly distributed in the circumferential direction for connecting the hook 117. The number of hanging ears is adjusted according to the number of wheel hub bolt holes and the diameter of the rotating drum.

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

[0083] like Figure 4 and Figure 5 As shown, the shaft of the rotating member 111 is supported by a bracket bearing 115, and the bracket bearing 115 positions the outer ring of the bearing through the stepped hole inside the bracket sleeve 113, and positions the inner ring of the bearing through the positioning sleeve and the fixing member 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 ends of the left bracket 101 and the right bracket 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, it is necessary to measure the distance between the fixing plate 102 and the center of the hub 2 in advance before installation, and adjust the height of the bracket accordingly according to the distance. At the same time, circumferential positioning is performed through the holes on the fixing plate 102 to ensure that the center of the drum is aligned with the center of the hub 2.

[0087] Specifically, if Figure 1As shown, a plurality of holes are provided on the left bracket 101 and the right bracket 103 , so the heights of the rotating member 111 and the motor support plate 104 can be adjusted by installing them at different holes.

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

[0089] like Figure 6 As shown, the steel wire rope 112 is marked to ensure that the length of the steel wire rope 112 from the hook 117 to the hollow positioning pin portion is equal during installation.

[0090] like Figure 7 The figure shows a three-dimensional structural schematic diagram of an equal-tension traction device for installing offshore wind turbine blades provided by an embodiment of the present invention when the blades are docked, wherein for simplified representation, only the connection status of one steel wire rope 112 is shown, and at the same time, in order to clearly show the connection status of the traction device, the hub 2 only shows a partial structure, and the dotted part in the figure is the state where the blade is offset due to the influence of sea conditions.

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

[0092] Furthermore, after the blade bolts and the hub bolt holes are aligned, the force of the wire rope 112 along the axial direction reaches a balance and will no longer drive the blades 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 an equal-tension traction method for installing offshore wind turbine blades, comprising the following steps:

[0095] A plurality of steel wires 112 are evenly arranged around the ends of the blades, one end of the plurality of steel wires 112 is respectively fixed to a plurality of blade bolts of the blades, and the other ends of the plurality of steel wires 112 are respectively passed through a plurality of hub bolt holes of the hub 2 from outside to inside.

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

[0097] The traction drive device 1 is used to pull the steel wire rope 112 , so that the steel wire rope 112 pulls the blade to move toward the hub 2 , and the blade bolts on the blade are pulled into the hub bolt holes of the hub 2 .

[0098] The specific steps are as follows:

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

[0100] S2, the crane lifts the fan blade 3, and the operator adjusts and completes the preliminary positioning of the blade bolt and the hub bolt hole, and there is no need to directly complete the docking;

[0101] S3, the operator passes the steel wire rope 112 passing 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 of the motor 124, the traction device starts to work, and the wire rope 112 drives the blade to move until the positioning is completed;

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

[0104] S6. The hub 2 is rotated to a suitable installation position, and steps S2 to S5 are repeated until the installation of the three blades is completed.

[0105] Example 3

[0106] This embodiment provides a method for centering an offshore wind turbine blade and a hub. The method can be used for the initial centering process of the wind turbine blade 3 during the hoisting process to achieve the initial positioning of the blade bolts and the hub bolt holes, as follows:

[0107] S1. Install a laser transmitter at one end of the rotating member 111 of the traction drive device 1 close to the blade, and install a laser receiver at the center of the blade;

[0108] S2. The operator uses the crane to lift the blade, and turns on the laser transmitter 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 to complete the preliminary positioning of the blade bolts and hub bolt holes.

[0110] Example 4

[0111] This embodiment provides a method for calculating the tension of a steel wire rope 112 of an equal tension traction device for installing offshore wind turbine blades. The method is applied in Embodiment 1, and is specifically as follows:

[0112] like Fig. 9 Three situations in which the fan blade 3 is offset are shown, including Case 1, a horizontal offset around the Y axis in the XZ plane, Case 2, a vertical offset around the X axis in the YZ plane, and Case 3, a circumferential offset around the Z axis in the XY plane.

[0113] Wind pressure per unit area:

[0114]

[0115] In the formula, ρ α is the air density, is the average wind speed at height Z during the averaging time T.

[0116] The total force acting on the object due to wind pressure is:

[0117]

[0118] In the formula, C Z is the wind-exposed structure height coefficient, C S is the component shape factor, A N is the windward area of ​​the load-bearing component.

[0119] When the wind-receiving area is asymmetric and there is a certain distance between the centroid of the overall wind-receiving area and the center of gravity, the wind force has torque effects 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] Where ρ is the air density; M XW 、M YW 、M ZW Respectively represent the moments along the X-axis, Y-axis, and Z-axis; F XWi Indicates the wind force in the X-axis and Y-axis directions; D Xi , D Yi represents the corresponding lever arm; U represents the wind speed; F XW 、F YWRepresents the wind force components in the X-axis and Y-axis directions respectively; C XB , C YB is the centroid position of the wind-exposed area; C XG , C YG It is the reference point and refers to 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 correction torque is composed of the X-axis force F of the wire rope 112 x offset:

[0127]

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

[0129] The force component in the X-axis direction shared by each steel wire rope 112 is:

[0130]

[0131] Wherein, n is the number of steel wire ropes 112; δ is the angle between the steel wire rope 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 correction torque is composed of the Z-axis component F of the wire rope 112 Z offset:

[0137]

[0138] The force component in the Z-axis direction shared by each steel wire rope 112 is:

[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, and the offset angle is γ.

[0144] like Fig. 9 As shown, the bolt hole originally located at position A moves to position B due to offset.

[0145] The correction torque is composed of the radial force F of the wire rope 112 r offset:

[0146]

[0147] The force component in the Z-axis direction shared by each steel wire rope 112 is:

[0148]

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

[0150]

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

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

[0153]

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

[0155]

[0156] Radial force (Case 3):

[0157]

[0158] Total tension of single wire rope 112:

[0159]

[0160] Tension of all wire ropes 112:

[0161] T 总 =n·T 单根 (19)

[0162] By calculating the tension of the steel wire rope 112, a steel wire rope 112 that meets the requirements can be selected during the traction installation of the fan blade 3, thereby 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 equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. An equal-tension traction device for installing offshore wind turbine blades, characterized in that: It includes a plurality of steel wire ropes uniformly arranged around the ends of the blades and a traction drive device; One ends of the plurality of steel wires are fixed to the plurality of blade bolts of the blades one by one, and the other ends of the plurality of steel wires are passed through the plurality of hub bolt holes of the hub from outside to inside one by one; The traction drive device is arranged in the wheel hub and fixedly connected to the other end of the wire rope; When the traction drive device pulls the steel wire rope, the steel wire rope pulls the blade to move toward the hub, and pulls the blade bolt on the blade into the hub bolt hole of the hub.

2. The equal-tension traction device for installing offshore wind turbine blades according to claim 1, characterized in that: The traction drive device includes a motor and a drum, the drum is rotatably connected to the wheel hub, and the outer periphery of the drum is connected to the wire rope; The motor is fixed to the wheel hub and connected to the drum, and is used for driving the drum to rotate so that the wire rope is wound around the drum.

3. The equal-tension traction device for installing offshore wind turbine blades according to claim 2, characterized in that: A plurality of lifting ears are evenly arranged on the outer circumference of the rotating drum, the plurality of lifting ears are arranged on a side of the rotating drum away from the blades, and a plurality of steel wire ropes are respectively connected to a plurality of hooks in a one-to-one correspondence.

4. The equal-tension traction device for installing offshore wind turbine blades according to claim 2, characterized in that: The rotation axis of the drum is aligned with the center of the hub.

5. The equal-tension traction device for installing offshore wind turbine blades according to claim 2, characterized in that: The traction drive device also includes a transmission device, and two ends of the transmission device are respectively connected to the motor and the drum.

6. The equal-tension traction device for installing offshore wind turbine blades according to claim 2, characterized in that: The traction drive device also includes a support assembly, the motor is fixedly connected to the support assembly, the support assembly is provided with holes at different heights, and the rotating drum is rotatably connected to any hole.

7. An equal-tension traction method for installing offshore wind turbine blades, characterized in that: The equal-tension traction device according to any one of claims 1 to 6 comprises the following steps: A plurality of steel wire ropes are evenly looped around the ends of the blades, one end of the plurality of steel wire ropes is respectively fixed to a plurality of blade bolts of the blades correspondingly, and the other ends of the plurality of steel wire ropes are respectively passed through a plurality of hub bolt holes respectively from outside to inside correspondingly; The traction drive device is arranged in the wheel hub and fixedly connected to the other end of the wire rope; The traction drive device is used to pull the wire rope, so that the wire rope pulls the blade to move toward the hub, and the blade bolts on the blade are pulled into the hub bolt holes of the hub.

8. The equal-tension traction method according to claim 7, characterized in that: The traction drive device is used to pull the wire rope by driving the drum to rotate through a motor. The rotation of the drum drives the wire rope to be wound around the drum, so that the wire rope is tightened and drives the blade to move toward the hub.

9. The equal-tension traction method according to claim 7, characterized in that: The wire rope tension value 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 circumferential offset around the Z axis in the XY plane. Wind pressure per unit area: In the formula, ρ α is the air density, is the average wind speed corresponding to the height Z during the average time T; The total force acting on the object due to wind pressure is: In the formula, C Z is the wind-exposed structure height coefficient, C S is the component shape factor, A N is the windward area of ​​the load-bearing component; When the wind-receiving area is asymmetric and there is a certain distance between the centroid of the overall wind-receiving area and the center of gravity, the wind force has torque effects in three directions: M XW =F YW (C YB -C YG ) M YW =F XW (C XB -C XG ) Where ρ is the air density; M XW 、M YW 、M ZW Respectively represent the moments along the X-axis, Y-axis, and Z-axis; F XWi Indicates the wind force in the X-axis and Y-axis directions; D Xi , D Yi represents the corresponding lever arm; U represents the wind speed; F XW 、F YW Represents the wind force components in the X-axis and Y-axis directions respectively; C XB , C YB is the centroid position of the wind-exposed area; C XG , C YG It is the reference point, which refers to the position of the center of gravity of the structure as a whole; 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 α. The correction torque is composed of the X-axis force F of the wire rope x offset: In the formula, R is the blade radius, that is, the distance from the hub center to the wire rope action point; The X-axis force shared by each wire rope: Where n is the number of wire ropes; δ is the angle between the wire rope and the vertical direction; The total tension of a single wire rope is: The vertical offset around the X axis in the YZ plane: The blade is vertically offset around the X axis in the YZ plane, with an offset angle of β; The correction torque is composed of the Z-axis force F of the wire rope Z offset: The force component in the Z-axis direction shared by each wire rope: The total tension of a single wire rope is: Circular offset around the Z axis in the XY plane: The blade is circumferentially offset around the Z axis in the XY plane, with an offset angle of γ; The correction torque is composed of the radial force F of the wire rope r offset: The force component in the Z-axis direction shared by each wire rope: The total tension of a single wire rope is:

10. The equal-tension traction method according to claim 9, characterized in that: When the three offsets exist simultaneously, the total tension of the wire rope needs to counteract the moment caused by the wind load in each plane at the same time; X-direction force: Force component in Z direction: Radial force component: Total tension of a single wire rope: Tension of all wire ropes: T 总 =n·T 单根 .

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