Method for assembling three tower barrels of large fan

Abstract

The invention relates to the technical field of new energy, in particular to a large fan three-piece tower tube assembling method which comprises the following steps that firstly, a first tube piece, a second tube piece and a third tube piece are conveyed to an assembling site; secondly, hoisting equipment, two telescopic supporting rods and two roller supports are prepared on the assembling site; thirdly, the first barrel piece is installed on the two roller supports through hoisting equipment; fourthly, the second barrel piece is installed on the first barrel piece through the hoisting equipment; fifthly, the second barrel piece and the first barrel piece are connected through two telescopic supporting rods; sixthly, a gap formed by the first barrel piece and the second barrel piece faces upwards through a roller support; and step 7, connecting the third barrel piece with the first barrel piece and the second barrel piece through hoisting equipment. According to the method, manual participation in the assembling process can be effectively reduced, the installation progress can be effectively accelerated, and the installation efficiency is effectively improved.

Description

Technical Field

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

[0002] The design of the segmented tower is mainly to solve the problem of over-limit transportation of large-diameter towers, improve transportation efficiency, effectively reduce transportation costs, and improve construction efficiency and flexibility. However, the prior art still requires a lot of manual participation in the process of assembling the segmented tower, that is, during the assembly process, it is necessary to manually adjust the installation position of the first tube segment, adjust the inclination angle of the second tube segment, and adjust the installation position of the third tube segment; due to the large number of manual steps, it is not only easy to cause low installation accuracy and low installation efficiency, but also easy to cause safety accidents; therefore, there is an urgent need for a large-scale wind turbine three-piece tower assembly method that can not only effectively reduce manual participation, but also effectively improve the installation progress and improve the efficiency of installation. Summary of the invention

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

[0004] To achieve the above object, 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 cylinder piece, the second cylinder piece, and the third cylinder piece to the assembly site;

[0006] Step 2: Prepare the lifting equipment, two retractable support rods, and two roller brackets on the assembly site;

[0007] Step 3: Install the first cylinder piece on the two roller brackets by using the lifting equipment;

[0008] Step 4: installing the second cylinder piece onto the first cylinder piece by the lifting equipment;

[0009] Step 5: Connecting the second tube piece to the first tube piece through the two retractable support rods;

[0010] Step 6: Then, the roller bracket is used to make the gap formed by the first cylinder sheet and the second cylinder sheet face upward;

[0011] Step seven: Connect the third cylinder piece with the first cylinder piece and the second cylinder piece through the lifting equipment.

[0012] Preferably, transport brackets are installed at the ends of both ends of the first cylinder piece, the second cylinder piece and the third cylinder piece in step one, and the third cylinder piece is placed first, and then the second cylinder piece is placed on the third cylinder piece, and then the first cylinder piece is placed on top of the second cylinder piece; and then the first cylinder piece, the second cylinder piece and the third cylinder piece are fixed by cables.

[0013] Preferably, the lifting equipment in step 2 includes two cranes, the hooks of the cranes are detachably connected to a flip hanger with a motor via a sling, and the flip hanger with a motor is detachably connected to the transport bracket.

[0014] Preferably, the two roller brackets in step 2 are symmetrically arranged and are on the same horizontal plane, and the symmetrically arranged fixed pulleys of the roller brackets are installed at one end of the roller bracket away from the ground.

[0015] Preferably, the fixed pulley is coated with an anti-fouling plastic film.

[0016] Preferably, the retractable support rod in step 2 includes an outer rod, an inner rod is installed at one end of the outer rod, and a fixed end of the oil cylinder is installed at the other end of the outer rod, the end of the inner rod extending into the outer rod is fixedly connected to the piston end of the oil cylinder, and the end of the inner rod extending outside the outer rod and the fixed end of the oil cylinder are respectively rotatably connected to a connecting shaft.

[0017] Preferably, the first cylinder piece in the step three is rotated 180° by the flip hanger with motor, so that the opening of the first cylinder piece faces upward, and the two ends of the bottom surface of the first cylinder piece are respectively on the roller bracket, and the bottom surface of the first cylinder piece is between the two fixed pulleys.

[0018] Preferably, the second cylinder in the step four is rotated 60° by the flip hanger with a motor.

[0019] Preferably, both ends of the retractable support rod in the step five are rotatably connected to the transport bracket on the first cylinder piece and the transport bracket on the second cylinder piece, respectively.

[0020] Preferably, both ends of the transport bracket on the third cylinder in step seven are detachably connected to the hook of the crane through the slings.

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

[0022] The present invention prepares hoisting equipment, two retractable support rods and two roller brackets at the assembly site; it can not only effectively reduce the manual participation in the assembly process of the first cylinder piece, the second cylinder piece and the third cylinder piece, but also effectively improve the installation progress and effectively improve the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of the arrangement order of the first cylinder sheet, the second cylinder sheet, and the third cylinder sheet of the present invention;

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

[0026] Figure 3 This is a schematic diagram of the structure of the overturning hanger with a motor of the present invention;

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

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

[0029] Figure 6 It is a schematic diagram of the structure of the overturning hanger with a motor installed on the transport bracket of the present invention;

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

[0031] Figure 8 It is a schematic diagram of the structure of the first cylinder sheet of the present invention being placed on the roller bracket;

[0032] Fig. 9 This is a schematic diagram of the second tube flipping structure of the present invention;

[0033] Fig.10 This is a schematic diagram of the installation position structure of the end face positioning plate and the side positioning plate of the present invention;

[0034] Fig.11 This is a schematic diagram of the installation position structure of the telescopic support rod of the present invention;

[0035] Fig.12 It is a structural schematic diagram of the first cylinder sheet and the second cylinder sheet of the present invention when they are connected at the longitudinal flange;

[0036] Fig.13 It is a schematic diagram of the C-shaped structure composed of the first tube sheet and the second tube sheet of the present invention being turned over with the opening facing upward;

[0037] Fig.14 It is a structural schematic diagram of the third cylinder piece of the present invention when it is connected with the C-shaped port formed by the first cylinder piece and the second cylinder piece;

[0038] Fig.15 It is a structural schematic diagram of the first cylinder piece and the third cylinder piece connected with the longitudinal seam and the second cylinder piece and the third cylinder piece connected with the longitudinal seam of the present invention;

[0039] Among them, 1. the first cylinder piece; 2. the second cylinder piece; 3. the third cylinder piece; 4. the roller bracket; 5. the flip hanger with a motor; 51. the first bolt; 52. the washer; 53. the first flat washer; 54. the first nut; 55. the shackle; 6. the telescopic support rod; 61. the outer rod; 62. the inner rod; 63. the connecting shaft; 64. the locking nut; 65. the oil cylinder; 7. the transport bracket; 8. the end face positioning plate; 9. the side positioning plate. DETAILED DESCRIPTION

[0040] The possible implementation schemes found in the art are:

[0041] Patent publication number CN116792262A discloses a tower segment transport tooling, an assembly tooling and a tower segment transport and assembly method. The patent includes the following construction steps:

[0042] S1: Install the mounting frame at the end of the tower segment;

[0043] S2: Use lifting equipment to stack the three tower segments with the notches facing upwards and place them on the transport equipment;

[0044] S3: After the tower segments are transported, the first tower segment is placed on the base and the rotating support is connected to the connecting frame;

[0045] S4: sequentially install and rotate the second tower segment and the third tower segment and support and fix the three tower segments with supporting rods;

[0046] S5: Assemble three tower segments.

[0047] Through the above steps, the tower segments are transported in a notch-upward manner. After the tower segments are transported, they can be directly assembled without turning them over, and the tower segments are lifted and rotated using lifting equipment. The tower segments can be assembled without using other driving equipment, thereby greatly reducing the difficulty of transporting and assembling the tower segments and improving the efficiency of transporting and assembling the tower segments.

[0048] When the tower segment begins to rotate, the center of gravity of the tower segment is located on the side of the hanging point close to the base in the vertical direction. As the tower segment continues to rotate, the hanging point and the center of gravity of the tower segment also move accordingly. When the tower segment completes the rotation, the center of gravity of the tower segment is located on the side of the hanging point away from the base in the vertical direction. When the hanging point and the center of gravity converge in the vertical direction, they reach the critical point. When passing the critical point, the tower segment will shake. At this time, the cable is pulled to stabilize the tower segment, thereby making the rotation of the tower segment more stable.

[0049] This patent uses a notch-upward method to transport tower segments. After the tower segments are transported, they can be directly assembled without flipping them. The tower segments are lifted and rotated using lifting equipment. No other driving equipment is needed to assemble the tower segments, thereby greatly reducing the difficulty of transporting and assembling the tower segments and improving the efficiency of transporting and assembling the tower segments.

[0050] This patent uses positioning pins and positioning sleeves to position the second mounting frame of the stacked tower segments, so that the second tower segment is more stably installed on the first tower segment.

[0051] This patent adopts an adjustable support link, rotates a rotating sleeve, and the rotating sleeve drives the two connecting rods to move together in a direction away from each other, so that the support link is pressed against the two mounting frames, thereby making the support effect of the support link better.

[0052] This patent connects the tower segments through independent connecting parts, and can be applied to tower segments of different diameters within a certain range by replacing the connecting parts, thereby improving the utilization rate of other tooling parts.

[0053] Embodiments that can be added to the present invention are:

[0054] A locking pulley is a special pulley that not only has the functions of a normal pulley, but also has a locking mechanism. This design allows the pulley to be fixed in place when needed to prevent it from sliding or rolling. Locking pulleys are usually used in industrial applications that require frequent starting and stopping, or that are subject to large impact loads, such as lifting machinery, conveying equipment, construction machinery, environmental protection equipment, etc.

[0055] The design of a locking pulley usually includes the following parts:

[0056] Pulley body: responsible for the basic function of sliding or rolling.

[0057] Locking Mechanism: Can be manual or automatic and is used to secure the position of the pulley.

[0058] Unlocking mechanism: used to release the locked state and restore the pulley to a sliding or rolling state.

[0059] The locking pulley is a powerful mechanical component. Its locking function makes it play an important role in a variety of application scenarios. Whether in industrial equipment, furniture, doors and windows, etc., the locking pulley can provide stable support and reliable locking function, improving the safety and convenience of equipment.

[0060] The working principle of a motorized tilting spreader generally involves the following key components and steps:

[0061] 1. Motor drive system

[0062] The overturning spreader with motor is usually equipped with a motor, which is the core component that provides power. The motor transmits power to other parts of the spreader through a transmission system (such as gears, chains or belts, etc.) to achieve the overturning action of the spreader.

[0063] 2. Transmission system

[0064] The transmission system converts the rotational motion of the motor into the tipping motion of the spreader. This may include devices such as worm gear reducers and gear boxes, which can change the direction and speed of movement to suit different work requirements.

[0065] 3. Control system

[0066] The control system is used to control the start, stop, speed and direction of the motor. This usually includes controllers, sensors and operator interfaces, which can realize automatic control and remote operation.

[0067] 4. Workflow

[0068] Lifting: First, the hoist is connected to the object through 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 rotates the hoist around a certain axis through the transmission system, thereby realizing the flipping of the object.

[0070] Positioning: After flipping to the required angle, the motor stops working and the spreader remains in this position until the subsequent operation (such as loading and unloading, processing, etc.) is completed.

[0071] 5. Safety devices

[0072] In order to ensure safe operation, the tilting spreader with motor is usually also equipped with various safety devices, such as limit switches, overload protection devices, emergency stop buttons, etc. These devices can prevent accidents from happening during the operation of the spreader.

[0073] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0074] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0075] Reference Figure 1-Figure 15 The present invention provides a method for assembling a three-piece tower of a large wind turbine, comprising the following steps:

[0076] Step 1: transport the first cylinder sheet 1, the second cylinder sheet 2, and the third cylinder sheet 3 to the assembly site;

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

[0078] Step 3: Install the first cylinder sheet 1 on two roller brackets 4 by means of a lifting device;

[0079] Step 4: Install the second cylinder piece 2 onto the first cylinder piece 1 by means of a hoisting device;

[0080] Step 5: Connect the second tube sheet 2 to the first tube sheet 1 through two retractable support rods 6;

[0081] Step 6: Then, the roller bracket 4 is used to make the gap formed by the first tube sheet 1 and the second tube sheet 2 face upwards;

[0082] Step 7: Connect the third cylinder piece 3 with the first cylinder piece 1 and the second cylinder piece 2 through the hoisting equipment.

[0083] The present invention prepares hoisting equipment, two retractable support rods 6, and two roller brackets 4 at the assembly site; it can not only effectively reduce the manual participation in the assembly process of the first cylinder piece 1, the second cylinder piece 2, and the third cylinder piece 3, but also effectively improve the installation progress and effectively improve the installation efficiency.

[0084] To further optimize the solution, transport brackets 7 are respectively installed at the ends of the first cylinder sheet 1, the second cylinder sheet 2 and the third cylinder sheet 3 in step one, the third cylinder sheet 3 is placed first, and then the second cylinder sheet 2 is placed on the third cylinder sheet 3, and then the first cylinder sheet 1 is placed on the second cylinder sheet 2; and then the first cylinder sheet 1, the second cylinder sheet 2 and the third cylinder sheet 3 are fixed by cables.

[0085] To further optimize the solution, the lifting equipment in step 2 includes two cranes, the hooks of the cranes are detachably connected to a tilting sling 5 with a motor via a sling, and the tilting sling 5 with a motor is detachably connected to a transport bracket 7.

[0086] According to a further optimization scheme, the two roller brackets 4 in step 2 are symmetrically arranged and are on the same horizontal plane, and the symmetrically arranged fixed pulleys of the roller brackets 4 are installed at one end of the roller brackets 4 away from the ground.

[0087] To further optimize the solution, the fixed pulley is coated with an anti-fouling plastic film.

[0088] Further optimizing the scheme, the telescopic support rod 6 in step 2 includes an outer rod 61, one end of the outer rod 61 is mounted with an inner rod 62, the other end of the outer rod 61 is mounted with a fixed end of a cylinder 65, one end of the inner rod 62 extending into the outer rod 61 is fixedly connected to the piston end of the cylinder 65, and one end of the inner rod 62 extending out of the outer rod 61 and the fixed end of the 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 cylinder 65.

[0089] To further optimize the solution, the first cylinder piece 1 in step three is rotated 180° by a flip hanger 5 with a motor, so that the opening of the first cylinder piece 1 faces upward, and the two ends of the bottom surface of the first cylinder piece 1 are respectively placed on the roller bracket 4, and the bottom surface of the first cylinder piece 1 is placed between the two fixed pulleys.

[0090] According to a further optimized solution, the second cylinder sheet 2 in step 4 is rotated 60° by a turning hanger 5 with a motor.

[0091] To further optimize the solution, both ends of the retractable support rod 6 in step five are rotatably connected to the transport bracket 7 on the first cylinder sheet 1 and the transport bracket 7 on the second cylinder sheet 2 respectively.

[0092] To further optimize the solution, both ends of the transport bracket 7 on the third cylinder sheet 3 in step seven are detachably connected to the hook of the crane through slings.

[0093] Reference Figure 1 , preparation work before assembly: transport the first cylinder piece 1, the second cylinder piece 2, and the third cylinder piece 3 to the fan installation site (refer to Figure 1 ), transport brackets 7 are respectively installed at both ends of each tower cylinder segment of the first cylinder segment 1, the second cylinder segment 2, and the third cylinder segment 3.

[0094] Preparation for fan installation site: hoisting equipment, two retractable support rods 6 (the structure of each retractable support rod 6, refer to Figure 4 ), two roller brackets 4 (the structure of each roller bracket 4, refer to Figure 3 ); two motor-operated flip slings 5 ​​(each motor-operated flip sling 5 has a structure, refer to Figure 3 ); Mark the positions of the two roller brackets 4 on the ground at the fan installation site in advance (refer to Figure 5 ), the ground strength of the installation site is >150Kpa.

[0095] Place two roller brackets 4 and place them at the pre-marked positions. 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 lengths of the first cylinder piece 1, the second cylinder piece 2, and the third cylinder piece 3, so that the two ends of the first cylinder piece 1 are respectively between the two fixed pulleys, and the ground height is <100mm; wrap each fixed pulley with an anti-fouling plastic film with a thickness of 10mm to prevent the first cylinder piece 1 and the second cylinder piece 2 from being contaminated. Before each lifting, check whether the plastic film is damaged.

[0096] Each motor-equipped tilting sling 5 is subjected to a tilting test in turn. After the test is successful, the two motor-equipped tilting slings 5 ​​are subjected to a synchronous tilting test. Before hoisting the first barrel 1 and the second barrel 2, the motor-equipped tilting sling 5 is mounted on the transport bracket 7 by means of the first bolt 51, the washer 52, the first flat washer 53, and the first nut 54, and connected to the sling by means of the shackle 55.

[0097] When hoisting the first cylinder sheet 1 or the second cylinder sheet 2, the turning hoist 5 with the motor is connected to the transport bracket 7 by means of the first bolt 51, the washer 52, the first flat washer 53 and the first nut 54 (refer to Figure 6 ), and ensure that the first bolt 51 connecting the tipping sling with motor 5 and the transport bracket 7 has been tightened as required.

[0098] When placing the first cylinder segment 1, the transport bracket 7 of the first cylinder segment 1 is connected to the turning hoist 5 with a motor through the first bolt 51, the washer 52, the first flat washer 53, and the first nut 54, and the sling is installed on the shackle 55. After the two cranes simultaneously lift the first cylinder segment 1 2 meters off the ground, the two turning hoists 5 with motors work synchronously to turn the first cylinder segment 1 180° and make the first cylinder segment 1 in a horizontal state, with the arc surface of the first cylinder segment 1 facing downward (refer to Figure 7 ), gently place the first tube sheet 1 on top of the roller bracket 4 (refer to Figure 8 ), and put the fixed pulley in a locked state; then, remove the flip hanger 5 with a motor at both ends of the first cylinder piece 1, and put the removed first bolt 51, washer 52, first flat washer 53, and first nut 54 in place for use in the second cylinder piece 2 and the third cylinder piece 3.

[0099] When installing the second cylinder segment 2, the transport bracket 7 of the second cylinder segment 2 is connected to the turning hoist 5 with a motor through the first bolt 51, the washer 52, the first flat washer 53, and the first nut 54, and the sling is installed on the shackle 55. After the crane lifts the second cylinder segment 2 2 meters off the ground at the same time, the two turning hoists 5 with motors work synchronously to turn the second cylinder segment 2 by 60 degrees, and make the second cylinder segment 2 and the first cylinder segment 1 in a docking state (refer to Fig. 9 ) ; Butt the second cylinder 2 with the longitudinal flange of the first cylinder 1 (butt the longitudinal seams of b and b first), and install the end face positioning plate 8 and the side positioning plate 9 on both ends of the flange side at the same time (refer to Fig.10 ).

[0100] The end face positioning plate 8 includes: a third bolt, a second flat washer, a customized bushing, and a second nut; the side positioning plate 9 includes: a full-thread 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 cylinder sheet 1 through the connecting shaft 63 and the locking nut 64, and one end of the telescopic support rod 6 is connected to the transport bracket 7 of the second cylinder sheet 2 through the connecting shaft 63 and the locking nut 64 (refer to Fig.11 ).

[0102] Install the second bolts of the longitudinal seam connecting the first cylinder piece 1 and the second cylinder piece 2. Without removing the hooks from the cranes on both sides, install all the second bolts from both ends of the longitudinal flanges connecting the first cylinder piece 1 and the second cylinder piece 2 to the middle, with a spacing of about 20 cm per bolt (refer to Fig.12 ); Use an impact wrench (400Nm) to tighten all second bolts until there is no gap between the longitudinal flanges.

[0103] The first cylinder piece 1 and the second cylinder piece 2 are rotated by the overturning hanger 5 with a motor to adjust the assembled position of the first cylinder piece 1 and the second cylinder piece 2. When rotating the tower, the fixed pulley is released to be in a rotating state. Through the rotation of the fixed pulley, the C-shaped tower cylinder composed of the first cylinder piece 1 and the second cylinder piece 2 is overturned to the opening upward (refer to Fig.13 ), when the longitudinal flange is perpendicular to the ground, the fixed pulley is in a locked state and the crane can be unhooked; remove the flip hanger 5 with motors at both ends, and put the removed first bolt 51, washer 52, first flat washer 53, and first nut 54 in place for use with the third cylinder piece 3; adjust the retractable support rod 6 so that the opening size of the first cylinder piece 1 and the second cylinder piece 2 is about 3 mm larger than the opening size of the third cylinder piece 3, and the reference is the outermost edge of the outer wall of the third cylinder piece 3.

[0104] Install the third cylinder 3, directly use the sling to connect the transport bracket 7, lift the third cylinder 3 to the top of the C-shaped opening between the first cylinder 1 and the second cylinder 2, and dock the longitudinal flanges (a and a dock, c and c dock) (refer to Fig.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 cylinder sheet 1 and the third cylinder sheet 3, and the connection between the second cylinder sheet 2 and the third cylinder sheet 3 (refer to Fig.10 The second cylinder piece 2 in the middle is butted against the longitudinal flange of the first cylinder piece 1 (first butt the longitudinal seams of b and b), and the end face positioning plates 8 and the side positioning plates 9 are installed on the flange sides at both ends at the same time).

[0106] Install the second bolts at the connection between the first cylinder sheet 1 and the third cylinder sheet 3 and the longitudinal seam between the second cylinder sheet 2 and the third cylinder sheet 3 (refer to Fig.15 ), without removing the hooks from the cranes on both sides, install all the second bolts (about 20cm spacing / bolt) from both ends of the longitudinal flanges connected to each other in turn, and use an impact wrench (400Nm) to tighten all the second bolts until there is no gap between the longitudinal flanges.

[0107] After the second bolt torque of all longitudinal flanges is applied, all end face positioning plates 8, telescopic support rods 6, and transport brackets 7 are removed; that is, the assembly of the three-piece tower is completed.

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

[0109] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for assembling a three-piece tower of a large wind turbine, characterized in that: The following steps are involved: Step 1: transporting the first cylinder sheet (1), the second cylinder sheet (2), and the third cylinder sheet (3) to the assembly site; Step 2: Prepare the hoisting equipment, two retractable support rods (6), and two roller brackets (4) on the assembly site; Step 3: installing the first cylinder sheet (1) on the two roller brackets (4) by means of the lifting equipment; Step 4: installing the second cylinder piece (2) onto the first cylinder piece (1) by means of the lifting equipment; Step 5: Connecting the second tube sheet (2) to the first tube sheet (1) via the two retractable support rods (6); Step 6: Then, the roller bracket (4) is used to make the gap formed by the first tube sheet (1) and the second tube sheet (2) face upwards; Step seven: Connect the third cylinder piece (3) with the first cylinder piece (1) and the second cylinder piece (2) by using the lifting equipment.

2. The method for assembling a three-piece tower of a large wind turbine according to claim 1, characterized in that: The ends of both ends of the first cylinder sheet (1), the second cylinder sheet (2) and the third cylinder sheet (3) in the step 1 are respectively installed with transport brackets (7), the third cylinder sheet (3) is placed first, and then the second cylinder sheet (2) is placed on the third cylinder sheet (3), and then the first cylinder sheet (1) is placed on top of the second cylinder sheet (2); then the first cylinder sheet (1), the second cylinder sheet (2) and the third cylinder sheet (3) are fixed by cables.

3. The method for assembling a three-piece tower of a large wind turbine according to claim 2, characterized in that: The hoisting equipment in step 2 comprises two cranes, the hooks of the cranes are detachably connected to a flip hoist (5) with a motor via a sling, and the flip hoist (5) with a motor is detachably connected to the transport bracket (7).

4. The method for assembling a three-piece tower of a large wind turbine according to claim 3, characterized in that: The two roller brackets (4) in step 2 are symmetrically arranged and are located on the same horizontal plane, and the symmetrically arranged fixed pulleys of the roller brackets (4) are installed at one end of the roller bracket (4) away from the ground.

5. The method for assembling a three-piece tower of a large wind turbine according to claim 4, characterized in that: The fixed pulley is coated with an anti-fouling plastic film.

6. The method for assembling a three-piece tower of a large wind turbine according to claim 1, characterized in that: The telescopic support rod (6) in step 2 comprises an outer rod (61), one end of the outer rod (61) is mounted with an inner rod (62), the other end of the outer rod (61) is mounted with a fixed end of an oil cylinder (65), one end of the inner rod (62) extending into the outer rod (61) is fixedly connected to the piston end of the oil cylinder (65), and one end of the inner rod (62) extending outside the outer rod (61) and the fixed end of the oil cylinder are rotatably connected to a connecting shaft (63) respectively.

7. The method for assembling a three-piece tower of a large wind turbine according to claim 4, characterized in that: The first cylinder (1) in the step three is rotated 180° by the flip hanger (5) with a motor, so that the opening of the first cylinder (1) faces upward, and the two ends of the bottom surface of the first cylinder (1) are respectively on the roller bracket (4), and the bottom surface of the first cylinder (1) is between the two fixed pulleys.

8. The method for assembling a three-piece tower of a large wind turbine according to claim 3, characterized in that: The second barrel (2) in the step 4 is rotated 60° by the overturning hanger (5) with a motor.

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

10. The method for assembling a three-piece tower of a large wind turbine according to claim 3, characterized in that: The two ends of the transport bracket (7) on the third cylinder sheet (3) in the step seven are detachably connected to the hook of the crane via the slings.

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