Equal-tension traction device for mounting offshore wind turbine blades

Abstract

The utility model relates to an equal-tension traction device for mounting blades of an offshore wind turbine. The equal-tension traction device comprises a plurality of steel wire ropes uniformly and annularly arranged at the end parts of the blades and a traction driving device, 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 utility model relates to the technical field of offshore wind turbine hoisting, in particular to an equal-tension traction device for installing offshore wind turbine blades. Background Art

[0002] As global demand for renewable energy continues to grow, offshore wind power has become a key means of meeting future energy needs. The installation phase of offshore wind power, a crucial part of the turbine lifecycle, is costly and technically complex, especially in harsh sea conditions. The installation process is fraught with challenges and risks. Therefore, improving installation efficiency and reducing costs while ensuring safety have become critical challenges in offshore wind power installation technology.

[0003] Currently, offshore wind turbines are primarily installed using a split-type hoisting system. Blades are typically inserted into the hub using a fixture, either diagonally or horizontally, from top to bottom. The ends of the blades are fitted with multiple blade bolts, and the hub has corresponding hub bolt holes. When the blades are docked with the hub, the bolts must be inserted into the corresponding hub bolt holes. The entire installation process relies heavily on the crane operator's real-time adjustments.

[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 and it is easily affected by sea conditions, making the installation process 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. Utility Model Content

[0006] In response to the problems existing in the prior art, the purpose of the utility model is to provide an equal-tension traction device for the installation of offshore wind turbine blades, which can achieve equal-tension traction of the wind turbine blades and ensure that the blade bolts and hub bolt holes are smoothly connected during the hoisting process of the wind turbine blades.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[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 wire ropes are fixed to the plurality of blade bolts of the blades in a one-to-one correspondence, and the other ends of the plurality of steel wire ropes are passed through the plurality of hub bolt holes arranged in the hub in a one-to-one correspondence from the outside to the inside;

[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 wire rope, the wire rope pulls the blade toward the hub, pulling 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 the 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] 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, 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 fixed 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] A method for isotropic pulling of offshore wind turbine blades, comprising the following steps:

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

[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 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 the 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.

[0022] Furthermore, 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.

[0023] Wind pressure per unit area:

[0024] Where, ρ α is 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] Where C Z is the height coefficient of the wind-exposed structure, C S is the component shape coefficient, A N is the windward area of ​​the loaded component;

[0027] When the wind-exposed area is asymmetric and there is a certain distance between the centroid of the entire wind-exposed 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 Represents the moments along the X-axis, Y-axis, and Z-axis respectively; F XWi Indicates the wind force in the X-axis and Y-axis directions; D Xi 、D Yi Indicates the corresponding lever arm; U indicates 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 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] Where R is the blade radius, that is, the distance from the hub center to the point of action of the wire rope;

[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] 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 Z-axis force 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 determined by the radial force F of the wire rope. r offset:

[0047] The Z-axis force 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 component:

[0051] Z-direction force component:

[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 utility model has the following advantages:

[0057] The utility model adopts circumferentially evenly distributed and equal-length steel wire ropes for spiral winding to achieve equal-tension traction of the wind turbine blades. It 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, realize active traction, and ensure that the blade bolts and hub bolt holes are smoothly connected during the hoisting of wind turbine blades. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0061] Figure 4 for Figure 3 A partial 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 partial enlarged view of point IV is shown.

[0064] Figure 7 This is a schematic structural diagram of the overall assembly of an embodiment of the utility model.

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

[0066] Figure 9 There are three situations in which fan blades may deviate.

[0067] In the picture:

[0068] 1-traction drive device, 2-wheel hub, 3-fan blade, 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 utility model 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 looped around the ends of the blades and a traction drive device 1;

[0072] One end of the plurality of steel wire ropes 112 is fixed to the plurality of blade bolts of the blades in a one-to-one correspondence, and the other ends of the plurality of steel wire ropes 112 are passed through the plurality of hub bolt holes of the hub 2 in a one-to-one correspondence from the outside to the inside;

[0073] The traction drive device 1 is arranged in 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 steel wire rope 112 , the steel wire rope 112 pulls the blade to move toward the hub 2 , and pulls the blade bolt on the blade into the hub bolt hole of the hub 2 .

[0075] Specifically, if 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 angle bracket 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 synchronous pulleys or gears. For simplicity, only the chain drive 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, which is welded with circumferentially evenly distributed lifting ears for connecting with the hook 117. The number of the lifting ears is adjusted according to the number of 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 the rope clip 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, which 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 hub 2, including drilling holes on 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 is marked to ensure that the length of the 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 schematic diagram of the three-dimensional structure 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. For the sake of simplicity, only the connection of one steel wire rope 112 is shown. At the same time, in order to clearly show the connection of the traction device, the hub 2 only shows part of the structure. The dotted part in the figure represents the state where the blades are 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 ropes 112 are spirally wound on the rotating drum. When the blades are dislocated due to the sea conditions, the joint 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 continues to decrease 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 pulling method for installing offshore wind turbine blades, comprising the following steps:

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

[0096] The traction drive device 1 is arranged in the wheel hub 2 and is 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 toward 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 fan blades 3, install the equal tension traction device according to the designed hole position and number of blades;

[0100] S2. The crane lifts the fan blade 3. Under the operator's adjustment, the blade bolts and the hub bolt holes are preliminarily 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 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 move the blades, and the staff assembles them;

[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 offshore wind turbine blades and hubs. This method can be used for the initial centering process during the hoisting of wind turbine blades 3 to achieve the initial positioning of blade bolts and hub bolt holes. The details are as follows:

[0107] S1. Install a laser transmitter on 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, completing 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 Example 1 and is specifically as follows:

[0112] like Figure 9 The diagram shows three cases where the fan blade 3 is offset, 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] Where, 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] Where C Z is the height coefficient of the wind-exposed structure, C S is the component shape coefficient, A N is the windward area of ​​the loaded component.

[0119] When the wind-exposed area is asymmetric and there is a certain distance between the centroid of the entire wind-exposed 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 Represents the moments along the X-axis, Y-axis, and Z-axis respectively; F XWi Indicates the wind force in the X-axis and Y-axis directions; D Xi 、D Yi Indicates the corresponding lever arm; U indicates 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 component 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 component of force 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 component of force 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, with an offset angle of γ.

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

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

[0146]

[0147] The component of force 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 wire rope 112 needs to offset the moments caused by the wind load in each plane simultaneously.

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

[0153]

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

[0155]

[0156] Radial force component (Case 3):

[0157]

[0158] Total tension of a 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 when the wind turbine blades 3 are towed and installed, thereby avoiding accidents during the installation process.

[0163] The above embodiments are preferred implementation methods of the present invention, but the implementation methods 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. An equal-tension traction device for installing offshore wind turbine blades, characterized by: 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 wire ropes are fixed to the plurality of blade bolts of the blades in a one-to-one correspondence, and the other ends of the plurality of steel wire ropes are passed through the plurality of hub bolt holes arranged in the hub in a one-to-one correspondence from the outside to the inside; 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 wire rope, the wire rope pulls the blade toward the hub, pulling 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. The plurality of steel wire ropes are respectively connected to the 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 fixed to the support assembly, the support assembly is provided with holes at different heights, and the rotating drum is rotatably connected to any hole.

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