A method for assembling a three-piece tower for a large wind turbine

Abstract

This invention relates to the field of new energy technology, and in particular to a method for assembling a three-section tower of a large wind turbine, comprising the following steps: Step 1: Transporting the first, second, and third sections of the tower to the assembly site; Step 2: Preparing hoisting equipment, two retractable support rods, and two roller supports at the assembly site; Step 3: Installing the first section onto the two roller supports using the hoisting equipment; Step 4: Installing the second section onto the first section using the hoisting equipment; Step 5: Connecting the second section to the first section using the two retractable support rods; Step 6: Ensuring the notch formed by the first and second sections faces upwards using the roller supports; Step 7: Connecting the third section to the first and second sections using the hoisting equipment. This invention not only effectively reduces manual intervention during assembly but also significantly improves installation progress and efficiency.

Description

Technical Field

[0001] This invention relates to the field of new energy technology, and in particular to a method for assembling a three-section tower of a large wind turbine. Background Technology

[0002] The segmented tower design primarily addresses the challenge of transporting large-diameter towers that exceed weight limits, improving transportation efficiency, effectively reducing transportation costs, and simultaneously enhancing construction efficiency and flexibility. However, current technologies require significant manual intervention during the assembly of segmented towers. This includes manual adjustments to the position of the first segment, the tilt angle of the second segment, and the position of the third segment. These manual steps not only lead to lower installation accuracy and efficiency but also increase the risk of safety accidents. Therefore, a novel three-segment tower assembly method for large wind turbines is urgently needed, which can effectively reduce manual intervention, accelerate installation progress, and improve efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a method for assembling a three-section tower of a large wind turbine to solve the problems existing in the prior art.

[0004] To achieve the above objectives, the present invention provides the following solution: a method for assembling a three-piece tower of a large wind turbine, comprising the following steps:

[0005] Step 1: Transport the first, second, and third wafers to the assembly site;

[0006] Step 2: Prepare the hoisting equipment, two telescopic support rods, and two roller brackets on site.

[0007] Step 3: Install the first cylindrical section onto the two roller supports using the hoisting equipment;

[0008] Step 4: Then, use the hoisting equipment to install the second cylindrical plate onto the first cylindrical plate;

[0009] Step 5: Connect the second cylindrical plate to the first cylindrical plate using the two retractable support rods;

[0010] Step Six: Then, using the roller bracket, make the notch formed by the first and second cylindrical plates face upwards;

[0011] Step 7: Then, use the hoisting equipment to connect the third cylindrical plate to the first cylindrical plate and the second cylindrical plate.

[0012] Preferably, in step one, the ends of the first cylindrical plate, the second cylindrical plate, and the third cylindrical plate are respectively equipped with transport brackets. The third cylindrical plate is placed first, then the second cylindrical plate is placed on the third cylindrical plate, and then the first cylindrical plate is placed on top of the second cylindrical plate. Then, the first cylindrical plate, the second cylindrical plate, and the third cylindrical plate are fixed by cables.

[0013] Preferably, the hoisting equipment in step two includes two cranes, and the hooks of the cranes are detachably connected to a motor-driven tilting device via slings. The motor-driven tilting device is detachably connected to the transport support.

[0014] Preferably, in step two, the two roller brackets are symmetrically arranged and on the same horizontal plane, and the fixed pulleys symmetrically arranged on the roller brackets are installed at the end of the roller brackets away from the ground.

[0015] Preferably, the fixed pulley is covered with a dirt-resistant plastic film.

[0016] Preferably, the telescopic support rod in step two includes an outer rod, an inner rod is installed at one end of the outer rod, a fixed end of a hydraulic cylinder is installed at the other end of the outer rod, one end of the inner rod extending into the outer rod is fixedly connected to the piston end of the hydraulic cylinder, and a connecting shaft is rotatably connected to the end of the inner rod extending out of the outer rod and the fixed end of the hydraulic cylinder, respectively.

[0017] Preferably, in step three, the first cylindrical plate is rotated 180° by the motor-driven tilting device, so that the opening of the first cylindrical plate faces upward, and the two ends of the bottom surface of the first cylindrical plate are respectively placed on the roller bracket, and the bottom surface of the first cylindrical plate is placed between the two fixed pulleys.

[0018] Preferably, in step four, the second cylindrical plate is rotated 60° by the motor-driven tilting device.

[0019] Preferably, in step five, the two ends of the telescopic support rod are rotatably connected to the transport bracket on the first cylindrical plate and the transport bracket on the second cylindrical plate, respectively.

[0020] Preferably, in step seven, the two ends of the transport bracket on the third cylindrical section are detachably connected to the hook of the crane via the slings.

[0021] The present invention discloses the following technical effects:

[0022] This invention, by preparing hoisting equipment, two telescopic support rods, and two roller brackets at the assembly site, can not only effectively reduce manual intervention during the assembly of the first, second, and third cylindrical sections, but also effectively improve the installation progress and efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a structural diagram showing the placement order of the first, second, and third cylindrical plates of the present invention;

[0025] Figure 2 This is a schematic diagram of the roller support structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the rotating lifting device with a motor according to the present invention;

[0027] Figure 4 This is a schematic diagram of the retractable support rod structure of the present invention;

[0028] Figure 5 This is a schematic diagram showing the placement of the two roller brackets of the present invention;

[0029] Figure 6 This is a schematic diagram of the motor-driven tilting lifting device of the present invention mounted on a transport support;

[0030] Figure 7 This is a schematic diagram of the first cylindrical plate flipping structure of the present invention;

[0031] Figure 8 This is a schematic diagram of the structure of the first cylindrical plate of the present invention placed on the roller support;

[0032] Figure 9 This is a schematic diagram of the second cylindrical plate flipping structure of the present invention;

[0033] Figure 10 This is a schematic diagram of the installation positions of the end face positioning plate and the side face positioning plate of the present invention;

[0034] Figure 11 This is a schematic diagram of the installation position structure of the retractable support rod of the present invention;

[0035] Figure 12 This is a schematic diagram of the structure when the first and second cylindrical plates are connected at the longitudinal flange.

[0036] Figure 13 This is a schematic diagram of the C-shaped structure formed by the first and second cylindrical plates of the present invention being flipped so that the opening faces upward;

[0037] Figure 14 This is a schematic diagram of the structure when the third cylindrical plate of the present invention is connected with the first and second cylindrical plates to form a C-shaped opening;

[0038] Figure 15 This is a schematic diagram of the structure when the first and third cylindrical plates are connected by the longitudinal seam and the second and third cylindrical plates of the present invention are connected by the longitudinal seam.

[0039] The components include: 1. First cylindrical plate; 2. Second cylindrical plate; 3. Third cylindrical plate; 4. Roller bracket; 5. Tilting lifting device with motor; 51. First bolt; 52. Washer; 53. First flat washer; 54. First nut; 55. Shackle; 6. Telescopic support rod; 61. Outer rod; 62. Inner rod; 63. Connecting shaft; 64. Locking nut; 65. Hydraulic cylinder; 7. Transport bracket; 8. End face positioning plate; 9. Side positioning plate. Detailed Implementation

[0040] The feasible implementations discovered in this field are as follows:

[0041] Patent publication number CN116792262A discloses a tower section transportation fixture, assembly fixture, and tower section transportation and assembly method. This patent includes the following construction steps:

[0042] S1: Install the mounting bracket at the end of the tower section;

[0043] S2: Use hoisting equipment to stack the three tower sections with their slots facing upwards onto the transport equipment;

[0044] S3: After the tower section is transported, place the first tower section on the base and connect the rotating support to the connecting frame;

[0045] S4: Install and rotate the second and third tower sections in sequence, and support and fix the three tower sections with support rods;

[0046] S5: Assemble the three tower sections.

[0047] Through the above steps, the tower sections are transported with the slots facing upwards. After the tower sections are transported, they can be directly assembled without flipping them over. The tower sections are then lifted and rotated using hoisting equipment, eliminating the need for other drive equipment. This greatly reduces the difficulty of transporting and assembling the tower sections and improves their efficiency.

[0048] When the tower section begins to rotate, its center of gravity is located vertically on the side of the lifting point closer to the base. As the tower section continues to rotate, the lifting point and the center of gravity also move. When the tower section completes its rotation, its center of gravity is located vertically on the side of the lifting point farther from the base. When the lifting point and the center of gravity converge vertically, a critical point is reached. When the tower section passes through the critical point, it will sway. At this time, the cable is pulled to stabilize the tower section, thereby making the rotation of the tower section more stable.

[0049] This patented technology transports tower sections by using an upward slot design. After transportation, the tower sections can be directly assembled without flipping them. Furthermore, the tower sections are lifted and rotated using hoisting equipment, eliminating the need for additional drive equipment. This significantly reduces the difficulty of transporting and assembling the tower sections and improves their efficiency.

[0050] This patent uses a positioning pin and a positioning sleeve to position the mounting frame for the second stacked tower section, making the second tower section more stable when mounted on the first tower section.

[0051] This patent employs an adjustable support link. By rotating the rotating sleeve, the two connecting rods move together in a direction away from each other, thereby making the support link press against the two mounting brackets, thus improving the support effect of the support link.

[0052] This patented technology connects to the tower plates via independent connectors, allowing for the use of tower plates of different diameters within a certain range by changing the connectors, thereby improving the utilization rate of other tooling components.

[0053] The embodiments that can be added to this invention are:

[0054] A locking pulley is a special type of pulley that not only possesses the functions of a regular pulley but also adds a locking mechanism. This design allows the pulley to be fixed in a specific position when needed, preventing it from sliding or rolling. Locking pulleys are typically used in industrial applications requiring frequent starts and stops or subjected to large impact loads, such as lifting machinery, conveying equipment, construction machinery, and environmental protection equipment.

[0055] A design with locking pulleys typically includes the following components:

[0056] Pulley body: Responsible for the basic functions of sliding or rolling.

[0057] Locking mechanism: Can be manual or automatic, used to fix the position of the pulley.

[0058] Unlocking mechanism: Used to unlock the pulley and restore it to a sliding or rolling state.

[0059] Locking pulleys are powerful mechanical components whose locking function makes them essential in a variety of applications. Whether in industrial equipment, furniture, or doors and windows, locking pulleys provide stable support and reliable locking, improving equipment safety and ease of use.

[0060] The working principle of a motor-driven tilting lifting device typically involves the following key components and steps:

[0061] 1. Motor drive system

[0062] Motorized tilting spreaders are typically equipped with a motor, which is the core component providing power. The motor transmits power to other parts of the spreader through a transmission system (such as gears, chains, or belts) to achieve the tilting action of the spreader.

[0063] 2. Transmission System

[0064] The transmission system converts the rotational motion of the motor into the tilting motion of the lifting device. This may include devices such as worm gear reducers and gearboxes, which can change the direction and speed of the motion to adapt to different work requirements.

[0065] 3. Control System

[0066] A control system is used to control the starting, stopping, speed, and direction of a motor. This typically includes controllers, sensors, and user interfaces, enabling automated control and remote operation.

[0067] 4. Work Process

[0068] Lifting: First, the lifting equipment is connected to the object to be lifted via a hook or other connecting device. The motor starts, and the object is lifted through the transmission system.

[0069] Flipping: After the object is lifted, the motor continues to work, and through the transmission system, the lifting device rotates around a certain axis, thereby flipping the object.

[0070] Positioning: After flipping to the desired angle, the motor stops working, and the lifting device remains in that position until subsequent operations (such as loading, unloading, processing, etc.) are completed.

[0071] 5. Safety devices

[0072] To ensure operational safety, motorized tilting spreaders are typically equipped with various safety devices, such as limit switches, overload protection devices, and emergency stop buttons. These devices prevent accidents from occurring during operation.

[0073] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0074] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0075] Reference Figures 1-15 This invention provides a method for assembling a three-section tower of a large wind turbine, comprising the following steps:

[0076] Step 1: Transport the first cylindrical plate 1, the second cylindrical plate 2, and the third cylindrical plate 3 to the assembly site;

[0077] Step 2: Assemble the hoisting equipment, two telescopic support rods 6, and two roller brackets 4 on site;

[0078] Step 3: Install the first cylindrical section 1 onto the two roller supports 4 using hoisting equipment;

[0079] Step 4: Then, use hoisting equipment to install the second cylindrical section 2 onto the first cylindrical section 1;

[0080] Step 5: Connect the second cylindrical plate 2 to the first cylindrical plate 1 using two telescopic support rods 6;

[0081] Step Six: Then, use the roller bracket 4 to make the notch formed by the first cylindrical plate 1 and the second cylindrical plate 2 face upwards;

[0082] Step 7: Then, use hoisting equipment to connect the third cylindrical section 3 with the first cylindrical section 1 and the second cylindrical section 2.

[0083] This invention, by preparing hoisting equipment, two telescopic support rods 6, and two roller brackets 4 at the assembly site, can not only effectively reduce manual intervention during the assembly of the first cylindrical plate 1, the second cylindrical plate 2, and the third cylindrical plate 3, but also effectively improve the installation progress and efficiency.

[0084] To further optimize the scheme, transport brackets 7 are installed at both ends of the first cylindrical plate 1, the second cylindrical plate 2, and the third cylindrical plate 3 in step one. The third cylindrical plate 3 is placed first, then the second cylindrical plate 2 is placed on the third cylindrical plate 3, and then the first cylindrical plate 1 is placed on top of the second cylindrical plate 2. Then, the first cylindrical plate 1, the second cylindrical plate 2, and the third cylindrical plate 3 are fixed by cables.

[0085] Further optimizing the plan, the hoisting equipment in step two includes two cranes. The crane hooks are detachably connected to a motor-driven tilting device 5 via slings. The motor-driven tilting device 5 is detachably connected to the transport support 7.

[0086] In a further optimized version, the two roller brackets 4 in step two are symmetrically arranged and on the same horizontal plane, and the fixed pulleys symmetrically arranged on the roller brackets 4 are installed at the end of the roller brackets 4 away from the ground.

[0087] The design has been further optimized, with the fixed pulleys covered with a dirt-resistant plastic film.

[0088] Further optimizing the design, the retractable support rod 6 in step two includes an outer rod 61, with an inner rod 62 installed at one end of the outer rod 61 and a fixed end of a hydraulic cylinder 65 installed at the other end. The end of the inner rod 62 extending into the outer rod 61 is fixedly connected to the piston end of the hydraulic cylinder 65. The end of the inner rod 62 extending out of the outer rod 61 and the fixed end of the hydraulic cylinder are rotatably connected to a connecting shaft 63. The length of the inner rod 62 extending out of the outer rod 61 is controlled by the hydraulic cylinder 65.

[0089] To further optimize the scheme, in step three, the first cylindrical plate 1 is rotated 180° by the motor-driven tilting hanger 5, so that the opening of the first cylindrical plate 1 faces upward, and the two ends of the bottom surface of the first cylindrical plate 1 are respectively placed on the roller bracket 4, and the bottom surface of the first cylindrical plate 1 is placed between two fixed pulleys.

[0090] To further optimize the scheme, in step four, the second cylindrical plate 2 is rotated 60° by a motor-driven tilting hoist 5.

[0091] To further optimize the scheme, the two ends of the telescopic support rod 6 in step five are rotatably connected to the transport bracket 7 on the first cylindrical plate 1 and the transport bracket 7 on the second cylindrical plate 2, respectively.

[0092] To further optimize the scheme, in step seven, the two ends of the transport support 7 on the third cylindrical section 3 are detachably connected to the hook of the crane via slings.

[0093] Reference Figure 1 Preparations before assembly: Transport the first cylindrical plate 1, the second cylindrical plate 2, and the third cylindrical plate 3 to the wind turbine installation site (refer to...). Figure 1 Transport supports 7 are installed at both ends of each of the first cylindrical section 1, the second cylindrical section 2, and the third cylindrical section 3.

[0094] Wind turbine installation site preparation: hoisting equipment, two telescopic support rods 6 (the structure of each telescopic support rod 6 is as follows...) Figure 4 ), two roller brackets 4 (the structure of each roller bracket 4 is shown in the reference). Figure 3 Two motorized tilting lifting devices 5 (the structure of each motorized tilting lifting device 5 is shown in the reference). Figure 3 Mark the placement positions of the two roller brackets 4 on the ground at the wind turbine installation site in advance (refer to...). Figure 5 The ground strength at the installation site is >150 kPa.

[0095] Place two roller brackets 4, and position them in the pre-marked locations as shown. Figure 5 Check the horizontality of the two roller brackets 4 (the distance between the two fixed pulleys on the same roller bracket 4 is <50mm). The distance between the two roller brackets 4 is determined according to the length of the first cylindrical plate 1, the second cylindrical plate 2, and the third cylindrical plate 3, so that the two ends of the first cylindrical plate 1 are respectively between the two fixed pulleys, and the ground height difference is <100mm. Wrap each fixed pulley with a 10mm thick anti-fouling plastic film to avoid contamination of the first cylindrical plate 1 and the second cylindrical plate 2. Before each hoisting, the plastic film must be checked for damage.

[0096] Each motor-driven tilting lifting device 5 is tested for tilting in sequence. After the test is successful, the two motor-driven tilting lifting devices 5 are tested for synchronous tilting. Before hoisting the first cylindrical segment 1 and the second cylindrical segment 2, the motor-driven tilting lifting device 5 is installed on the transport support 7 using the first bolt 51, washer 52, first flat washer 53, and first nut 54, and connected to the sling through the shackle 55.

[0097] When hoisting the first cylindrical section 1 or the second cylindrical section 2, the motor-driven tilting hoist 5 is connected to the transport support 7 via the first bolt 51, washer 52, first flat washer 53, and first nut 54 (see reference). Figure 6 ), and ensure that the first bolt 51 connecting the motor-driven tilting hoist 5 to the transport bracket 7 has been tightened as required.

[0098] When placing the first cylindrical section 1, the transport bracket 7 of the first cylindrical section 1 is connected to the motor-driven tilting lifting device 5 via the first bolt 51, washer 52, first flat washer 53, and first nut 54, and the sling is installed on the shackle 55. After the two cranes simultaneously lift the first cylindrical section 1 2 meters off the ground, the two motor-driven tilting lifting devices 5 work synchronously to tilt the first cylindrical section 1 180° and make it horizontal, with the arc surface of the first cylindrical section 1 facing down (see reference). Figure 7 Gently place the first cylindrical plate 1 on top of the roller support 4 (refer to...). Figure 8 Then, the motorized tilting hangers 5 at both ends of the first cylindrical plate 1 are removed, and the removed first bolt 51, washer 52, first flat washer 53, and first nut 54 are placed in place for use by the second cylindrical plate 2 and the third cylindrical plate 3.

[0099] When installing the second cylindrical section 2, the transport bracket 7 of the second cylindrical section 2 is connected to the motor-driven tilting lifting device 5 via the first bolt 51, washer 52, first flat washer 53, and first nut 54, and the sling is installed on the shackle 55. After the crane simultaneously lifts the second cylindrical section 2 meters off the ground, the two motor-driven tilting lifting devices 5 work synchronously to tilt the second cylindrical section 2 by 60°, so that the second cylindrical section 2 is in a docking state with the first cylindrical section 1 (see reference). Figure 9 The second cylindrical plate 2 is joined to the longitudinal flange of the first cylindrical plate 1 (first join the longitudinal seams of b and b), and the end face positioning plate 8 and the side positioning plate 9 are installed on both flange sides simultaneously (refer to...). Figure 10 ).

[0100] The end face positioning plate 8 includes: a third bolt, a second flat washer, a custom bushing, and a second nut; the side positioning plate 9 includes: a fully threaded bolt and a third flat washer.

[0101] Install the telescopic support rod 6, so that one end of the telescopic support rod 6 is connected to the transport bracket 7 of the first cylindrical section 1 via the connecting shaft 63 and the locking nut 64, and the other end of the telescopic support rod 6 is connected to the transport bracket 7 of the second cylindrical section 2 via the connecting shaft 63 and the locking nut 64 (see reference). Figure 11 ).

[0102] Install the second bolts at the longitudinal joint connecting the first cylindrical segment 1 and the second cylindrical segment 2. Without unhooking the cranes on both sides, install all the second bolts from both ends of the longitudinal flange connecting the first cylindrical segment 1 and the second cylindrical segment 2 towards the center, with a spacing of approximately 20cm per bolt (refer to...). Figure 12 Use an impact wrench (400 Nm) to tighten all the second bolts until there is no gap between the longitudinal flanges.

[0103] The first cylindrical section 1 and the second cylindrical section 2 are rotated using a motor-driven tilting hoist 5 to adjust their assembled positions. While rotating the tower, the fixed pulley is released and rotated. Through the rotation of the fixed pulley, the C-shaped tower section formed by the first cylindrical section 1 and the second cylindrical section 2 is tilted so that the opening faces upwards (see reference). Figure 13 When the longitudinal flange is perpendicular to the ground, the fixed pulley is locked and the crane can be unhooked; remove the motorized tilting lifting device 5 at both ends, and place the disassembled first bolt 51, washer 52, first flat washer 53, and first nut 54 in place for use by the third cylindrical plate 3; adjust the telescopic support rod 6 so that the opening size of the first cylindrical plate 1 and the second cylindrical plate 2 is about 3mm larger than the opening size of the third cylindrical plate 3, with the reference being the outermost edge of the outer wall of the third cylindrical plate 3.

[0104] Install the third cylindrical section 3, directly connect the transport support 7 using slings, and hoist the third cylindrical section 3 above the C-shaped opening of the first cylindrical section 1 and the second cylindrical section 2. Connect the longitudinal flanges (a to a, c to c) (refer to...). Figure 15 ).

[0105] Install the end face positioning plates 8 and side positioning plates 9 on both sides of the two longitudinal flanges at the connection between the first cylindrical plate 1 and the third cylindrical plate 3, and at the connection between the second cylindrical plate 2 and the third cylindrical plate 3 (refer to...). Figure 10 The second cylindrical plate 2 is connected to the longitudinal flange of the first cylindrical plate 1 (first connect the longitudinal seams of b and b), and the end face positioning plate 8 and the side positioning plate 9 are installed on both flange sides at the same time.

[0106] Install the second bolt at the connection between the first cylindrical section 1 and the third cylindrical section 3, and at the longitudinal seam connecting the second cylindrical section 2 and the third cylindrical section 3 (refer to...). Figure 15 Without unhooking the cranes on both sides, install all the second bolts (approximately 20cm spacing) from both ends of the longitudinal flanges connecting the first cylindrical plate 1, the third cylindrical plate 3, the second cylindrical plate 2, and the third cylindrical plate 3 in sequence; use an impact wrench (400Nm) to tighten all the second bolts until there are no gaps between the longitudinal flanges.

[0107] After the second bolt torque of all longitudinal flanges is reached, remove all end face positioning plates 8, telescopic support rods 6, and transport brackets 7; thus completing the assembly of the three tower sections.

[0108] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0109] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for assembling a three-section tower of a large wind turbine, characterized in that: Includes the following steps: Step 1: Transport the first cylindrical plate (1), the second cylindrical plate (2), and the third cylindrical plate (3) to the assembly site; Step 2: Assemble the hoisting equipment, two telescopic support rods (6), and two roller brackets (4) on site. Step 3: Install the first cylindrical plate (1) onto the two roller supports (4) using the hoisting equipment; Step 4: Then, use the hoisting equipment to install the second cylindrical plate (2) onto the first cylindrical plate (1); Step 5: Then connect the second cylindrical plate (2) to the first cylindrical plate (1) using the two telescopic support rods (6); Step 6: Then, using the roller bracket (4), the notch formed by the first cylindrical plate (1) and the second cylindrical plate (2) is made to face upwards; Step 7: Then connect the third cylindrical plate (3) to the first cylindrical plate (1) and the second cylindrical plate (2) using the hoisting equipment; In step one, transport brackets (7) are installed at both ends of the first cylindrical plate (1), the second cylindrical plate (2), and the third cylindrical plate (3). The third cylindrical plate (3) is placed first, then the second cylindrical plate (2) is placed on the third cylindrical plate (3), and then the first cylindrical plate (1) is placed on top of the second cylindrical plate (2). Then, the first cylindrical plate (1), the second cylindrical plate (2), and the third cylindrical plate (3) are fixed by cables. The hoisting equipment in step two includes two cranes. The hooks of the cranes are detachably connected to a motor-driven tilting device (5) via slings. The motor-driven tilting device (5) is detachably connected to the transport support (7). In step two, the two roller brackets (4) are symmetrically arranged and on the same horizontal plane, and the fixed pulleys symmetrically arranged on the roller brackets (4) are installed at the end of the roller brackets (4) away from the ground. The telescopic support rod (6) in step two includes an outer rod (61), an inner rod (62) is installed at one end of the outer rod (61), and a fixed end of a hydraulic cylinder (65) is installed at the other end of the outer rod (61). The end of the inner rod (62) that extends into the outer rod (61) is fixedly connected to the piston end of the hydraulic cylinder (65). The end of the inner rod (62) that extends out of the outer rod (61) and the fixed end of the hydraulic cylinder are respectively rotatably connected to a connecting shaft (63). In step three, the first cylindrical plate (1) is rotated 180° by the motor-driven tilting hanger (5), so that the opening of the first cylindrical plate (1) faces upward, and the two ends of the bottom surface of the first cylindrical plate (1) are respectively placed on the roller bracket (4), and the bottom surface of the first cylindrical plate (1) is placed between the two fixed pulleys.

2. The method for assembling a three-section tower of a large wind turbine according to claim 1, characterized in that: The fixed pulley is covered with a dirt-resistant plastic film.

3. The method for assembling a three-section tower of a large wind turbine according to claim 1, characterized in that: In step four, the second cylindrical plate (2) is rotated 60° by the motor-driven tilting device (5).

4. The method for assembling a three-section tower of a large wind turbine according to claim 1, characterized in that: In step five, the two ends of the telescopic support rod (6) are rotatably connected to the transport bracket (7) on the first cylindrical plate (1) and the transport bracket (7) on the second cylindrical plate (2), respectively.

5. The method for assembling a three-section tower of a large wind turbine according to claim 1, characterized in that: In step seven, the two ends of the transport support (7) on the third cylindrical plate (3) are detachably connected to the hook of the crane via the slings.

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