A method of hoisting a wind turbine rotor within a tower

Abstract

The application relates to the technical field of marine equipment, and discloses a wind power rotor inner tower hoisting method, which comprises the following steps: 1) pretreatment of the wind power rotor inner tower: flange assembly of the wind power rotor inner tower is completed and finish machining is carried out; 2) installation of hoisting on each flange: hoisting is installed on the flange; 3) completion of connection between the hoisting and the suspension device: the hoisting rope of the suspension device is connected with the hoisting; 4) inspection before hoisting: whether the hoisting is airtight and whether the connection between the hoisting and the suspension device is stable is checked; and 5) starting of the suspension device: the wind power rotor inner tower is vertically hoisted through front and rear suspensions. The wind power rotor inner tower hoisting method is characterized in that, through cooperation of the stress receiving piece, the load sharing piece and the connecting piece, in the process that the flange surface changes from the vertical state to the parallel state, the hoisting can evenly distribute the pulling force on the surface of the load sharing piece, the problem of flange surface deformation caused by uneven stress is reduced, and the flange surface which has been finish machined is protected without welding of the lifting lugs.

Description

Technical Field

[0001] This invention relates to the field of marine equipment technology, specifically to a method for hoisting the inner tower of a wind turbine rotor. Background Technology

[0002] The marine wind turbine rotor consists of an inner base, an inner tower, and an outer tower. The lower part of the inner tower is connected to the base via a flange, and the upper part is connected to the upper tower body via a flange. Because the wind turbine rotor is a moving mechanism, the flange faces require high flatness during connection. After welding the upper and lower flanges of the inner tower structure, the upper and lower flange faces need to be machined as a whole. After the flange faces are machined as a whole, the inner tower needs to be adjusted from a flat manufacturing state to a vertical working state.

[0003] Most existing methods for hoisting the inner tower of wind turbine rotors rely on welding lifting lugs to the flange faces. Since both the upper and lower flange faces have already undergone precision machining, welding lifting lugs to these faces can cause welding deformation and easily leave scratches on the flange faces during disassembly. Furthermore, during suspension, the flange faces will gradually change from a vertical to a parallel state. During this change, the connection method of the lifting lugs results in uneven stress on the flange faces. Uneven force distribution at the lifting points can easily damage the flange faces. Therefore, it is important to reduce the impact of force transmission at the lifting points on the upper and lower flange faces of the inner tower and to ensure that the force at the lifting points is evenly distributed. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a method for hoisting the inner tower of a wind turbine rotor, which has advantages such as protecting the flange surface and solving the problem of uneven stress on the flange surface.

[0006] (II) Technical Solution

[0007] To achieve the aforementioned purpose of protecting the flange surface, the present invention provides the following technical solution: a method for hoisting the inner tower of a wind turbine rotor, comprising the following steps:

[0008] 1) Pre-treatment of the inner tower of the wind turbine rotor: complete the flange assembly and precision machining of the inner tower of the wind turbine rotor;

[0009] 2) Installation and hoisting on each flange: Install the hoisting device on the flange;

[0010] 3) Complete the connection between the hoisting and suspension devices: Connect the hoisting ropes of the suspension device to the hoisting equipment;

[0011] 4) Pre-hoisting inspection: Check whether the hoisting is sealed and whether the connection between the hoisting device and the suspension device is stable;

[0012] 5) Start the suspension device: suspend the inner tower of the wind turbine rotor vertically from the front and rear.

[0013] Preferably, the pretreatment of the inner tower of the wind turbine rotor is as follows: the upper and lower parts of the inner tower of the wind turbine rotor are connected to flanges with bolts, and the connection is welded after connection. After completion, the upper and lower flange surfaces are machined as a whole to achieve a flatness of 1mm on the upper and lower flange surfaces.

[0014] Preferably, the installation and hoisting on each flange specifically involves bolting and hoisting at the upper and lower flanges of the inner tower of the wind turbine rotor, wherein the hoisting distribution parts are pre-installed inside the load-bearing parts, and the connecting parts pass through the load-bearing parts through through holes.

[0015] Preferably, the connection of the hoisting and suspension device is specifically achieved by connecting the hoisting ropes of the two cranes to the upper and lower hoisting connectors respectively.

[0016] Preferably, the pre-hoisting inspection specifically includes: checking whether the flange bolts on the upper and lower parts of the inner tower of the wind turbine rotor are stably connected; checking whether the flange welds on the upper and lower parts of the inner tower of the wind turbine rotor have welds; checking whether the flange surfaces on the upper and lower parts of the inner tower of the wind turbine rotor meet the flatness standard; checking whether the load-bearing components inside the hoisting are sealed; and checking whether the connection between the upper and lower hoisting and the hoisting ropes is stable.

[0017] Preferably, the suspension device is activated as follows: according to the suspension requirements, the upper part of the inner tower is used as the main hook and the lower part of the inner tower is used as the auxiliary hook. The crane is activated simultaneously, and the main hook and auxiliary hook are used to lift the inner tower of the wind turbine rotor horizontally to prevent excessive pressure on the other side caused by lifting on one side. After the inner tower of the wind turbine rotor is lifted horizontally to a certain height, the crane at the main hook continues to lift while the crane at the auxiliary hook stops lifting, so that the inner tower of the wind turbine rotor begins to tilt and rise on one side. During the process, the crane at the auxiliary hook gradually lowers until the main hook is completely vertical, thus completing the suspension or vertical placement of the inner tower of the wind turbine rotor.

[0018] Preferably, the number of hoisting devices is two, and the two hoisting devices are respectively connected to the upper and lower flange surfaces of the inner tower of the wind turbine rotor. Each hoisting device includes a load-bearing component, a load-sharing component, and a connecting component. The load-bearing component is connected to the flange surface and is used to bear the tension of the hoisting rope. The load-sharing component is disposed between the load-bearing component and the flange surface to distribute the tension evenly. The connecting component is disposed between the load-sharing component and the load-bearing component, and a part of the connecting component passes through the load-bearing component to the outside for connecting the hoisting rope.

[0019] Preferably, the force-bearing component includes a mounting part, a threaded hole, a through hole, a limiting groove, and a buffer pipe. The mounting part has threaded holes around one side along the axial direction, a through hole is formed at the center of one side along the axial direction, a limiting groove is formed at the center of the other side along the axial direction, and a buffer pipe is formed around the bottom of the inner wall of the limiting groove.

[0020] Preferably, the distribution component includes a push ring, a sealing piston, and a fixing rod. The push ring is disposed in the limiting groove, the side of the push ring near the buffer pipe is provided with a sealing piston, and the inner side of the push ring is provided with a fixing rod.

[0021] Preferably, the connector includes a tensile post and a sliding part. The tensile post is disposed on the fixing rod, and the fixing rod is disposed around the tensile post. One side of the fixing rod passes through the through hole, and the end of the fixing rod away from the fixing rod is provided with a sliding part through an opening groove.

[0022] (III) Beneficial Effects

[0023] Compared with the prior art, the present invention provides a method for hoisting the inner tower of a wind turbine rotor, which has the following advantages:

[0024] 1. This method for hoisting the inner tower of a wind turbine rotor, through the coordinated arrangement of load-bearing components, distribution components, and connecting components, can evenly distribute the tensile force across the distribution components as the flange face gradually changes from vertical to parallel. The internal surface of the hoisting components prevents the stress from concentrating on one side or at a localized point, reducing flange deformation caused by uneven stress. Furthermore, the distribution components and connecting components are concealed within the load-bearing components, not affecting the use of the flange face. This eliminates the need for welding lifting lugs, saving the process of removing them and protecting the already precision-machined flange face. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the hoisting structure of the inner tower hoisting method for a wind turbine rotor proposed in this invention;

[0026] Figure 2 This is a split view of the hoisting method for the inner tower of a wind turbine rotor proposed in this invention;

[0027] Figure 3 This is a schematic diagram of the installation section of the wind turbine rotor inner tower hoisting method proposed in this invention;

[0028] Figure 4 This is an inverted view of the stress-bearing components in the wind turbine rotor inner tower hoisting method proposed in this invention;

[0029] Figure 5 This is a cross-sectional view of the load-bearing component in the wind turbine rotor inner tower hoisting method proposed in this invention;

[0030] Figure 6 This is a schematic diagram of the structure of the component in the wind turbine rotor inner tower hoisting method proposed in this invention;

[0031] Figure 7This is an inverted view of the components of the wind turbine rotor inner tower hoisting method proposed in this invention;

[0032] Figure 8 This is a block diagram of a method for hoisting the inner tower of a wind turbine rotor according to the present invention.

[0033] Figures 1 to 8 In the middle, 1. load-bearing component; 101. mounting part; 102. threaded hole; 103. through hole; 104. limiting groove; 105. buffer pipe; 2. distribution component; 201. push ring; 202. sealing piston; 203. fixing rod; 3. connecting part; 301. tensile column; 302. sliding part. Detailed Implementation

[0034] 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.

[0035] In this invention, "outer diameter" and "inner diameter" refer to the diameter of a circular structure, while for a non-circular structure, the inner diameter refers to the diameter of its inscribed circle and the outer diameter refers to the diameter of its circumscribed circle. "Axial direction" refers to the direction of the central axis of a cylindrical rod structure, while for a non-cylindrical channel, the axial direction refers to the length direction of the rod structure.

[0036] In this invention, the terms "upper," "lower," "top," "bottom," "vertical," "horizontal," "lateral," and "longitudinal," etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0037] Please refer to Figures 1 to 8 As shown in this embodiment, a method for hoisting the inner tower of a wind turbine rotor includes the following steps:

[0038] 1) Pre-treatment of the inner tower of the wind turbine rotor: complete the flange assembly and precision machining of the inner tower of the wind turbine rotor;

[0039] 2) Installation and hoisting on each flange: Install the hoisting device on the flange;

[0040] 3) Complete the connection between the hoisting and suspension devices: Connect the hoisting ropes of the suspension device to the hoisting equipment;

[0041] 4) Pre-hoisting inspection: Check whether the hoisting is sealed and whether the connection between the hoisting device and the suspension device is stable;

[0042] 5) Start the suspension device: vertically suspend the inner tower of the wind turbine rotor from the front and rear;

[0043] In this embodiment, the pretreatment of the wind turbine rotor inner tower specifically involves: both the upper and lower parts of the wind turbine rotor inner tower are bolted to flanges. These flanges are connecting components between structures, used to connect the lower part of the wind turbine rotor inner tower to the base via flanges, and the upper part of the wind turbine rotor inner tower to the upper tower body via flanges. Flange connection refers to a detachable connection consisting of a flange, gasket, and bolts forming a combined sealing structure. The flanges have holes, and the bolts tightly connect the two flanges. Flange connection is a known technology and serves a connecting function, so it will not be elaborated further here. After connection, the flange joints are welded. After completion, the upper and lower flange surfaces are machined as a whole to achieve a flatness of 1mm, meeting the required flatness for operation. It is worth noting that this flatness can be less than 1mm, within any applicable range.

[0044] The installation and hoisting on each flange is as follows: bolted hoisting is performed on the upper and lower flanges of the inner tower of the wind turbine rotor. The hoisting installation part 101 is a flange-like component. The connection between the hoisting part and the flange surface is completely fitted to achieve the effect of transmitting and distributing the force. The hoisting distribution component 2 is pre-set inside the force-bearing component 1, and the connecting component 3 passes through the through hole 103 through the force-bearing component 1, so that when not connected, the distribution component 2 inside the force-bearing component 1 does not affect the installation of the flange.

[0045] The connection of the hoisting and suspension devices is completed as follows: the hoisting ropes of the two cranes are connected to the connecting parts of the upper and lower hoisting points respectively. The maximum suspension height of the upper hoisting crane is at least twice the height of the inner tower of the wind turbine rotor to ensure the complete verticality of the inner tower of the wind turbine rotor. The maximum suspension height of the lower hoisting crane is at least half the height of the inner tower of the wind turbine rotor. A smaller suspension crane can be used for the lower hoisting crane to cooperate with the upper hoisting crane.

[0046] The specific checks before hoisting are as follows: Check whether the flange bolts on the upper and lower parts of the inner tower of the wind turbine rotor are stably connected. The upper and lower parts of the inner tower should be completely flush with the flange surface, without any single side tilting that would affect the suspension. M20 bolts of grade 8.8 can be used. Check whether the flange welds on the upper and lower parts of the inner tower have weld seams. Fillet welds can be used on the welded surfaces of the flange welds on the upper and lower parts of the inner tower, and continuous fillet welds can be used on all four sides. Check whether the flange surfaces on the upper and lower parts of the inner tower meet the flatness standard, which is at most 1mm. Check whether the buffer pipe 105 and the sealing piston 202 in the load-bearing component 1 inside the hoisting system are sealed and do not affect the force-sharing effect. Check whether the connection between the upper and lower hoisting components and the hoisting ropes is stable to prevent rope breakage.

[0047] The specific steps for activating the suspension device are as follows: Based on the suspension requirements, the upper part of the inner tower is used as the main hook, and the lower part as the auxiliary hook. The hoisting rope is passed through the sliding part 302, and the crane is simultaneously activated. The main hook and auxiliary hook are used to horizontally raise the inner tower of the wind turbine rotor to prevent excessive pressure on the other side caused by unilateral lifting. After the inner tower of the wind turbine rotor is horizontally raised to a certain height, the crane at the main hook continues to raise while the crane at the auxiliary hook stops, causing the inner tower of the wind turbine rotor to begin tilting upwards on one side. During this process, the crane at the auxiliary hook gradually lowers to prevent affecting the movement of the main hook. Simultaneously, the sliding part 302 rotates as the main hook rises, making the connection between the hoisting rope and the tension column 301 smoother and reducing friction generated during rotation. Furthermore, the tension is transmitted through the tension column 301 to the fixed rod 203, which is then driven by the push ring 201. As the piston 202 rises, it is pressurized by the buffer pipe 105. Since the buffer pipe 105 is annular, the pressure is distributed by the annular structure. It is worth noting that the force-bearing surface includes the bottom surface of the mounting part 101, the contact surface between the mounting part 101 and the flange surface, and the four sides of the limiting groove 104. The bottom surface of the mounting part 101 is an unconventional force-bearing surface, which has the effect of distributing the force. However, in conventional hoisting, it is difficult to distribute the force to the interior of the hoisting, so the force is easily uneven, so that the force-bearing surface will not be concentrated on one side, so as to achieve the even distribution of the force on the force-bearing component 1. Since the force-bearing component 1 and the flange surface are completely parallel, the force is also evenly distributed on the flange surface and will not be concentrated on one side of the flange surface, thus protecting the flange surface until the main hook is completely vertical, completing the suspension or vertical placement of the inner tower of the wind turbine rotor.

[0048] Please refer to Figures 1 to 8As shown, in this embodiment, there are two hoisting devices. The two hoisting devices are respectively connected to the upper and lower flange surfaces of the inner tower of the wind turbine rotor. The hoisting device includes a load-bearing component 1, a distribution component 2, and a connecting component 3. The load-bearing component 1 is connected to the flange surface and is used to bear the tension of the hoisting rope. The distribution component 2 is set between the load-bearing component 1 and the flange surface to distribute the tension evenly. The connecting component 3 is set between the distribution component 2 and the load-bearing component 1, and a part of the connecting component 3 passes through the load-bearing component 1 to the outside to connect the hoisting rope.

[0049] The load-bearing component 1 includes a mounting part 101, threaded holes 102, through holes 103, a limiting groove 104, and a buffer pipe 105. The mounting part 101 has the same shape as the flange, allowing it to fit snugly against the flange face of the wind turbine rotor inner tower, thus evenly distributing the load. Threaded holes 102 are provided around one side of the mounting part 101 along the axial direction. These holes are used for connection between the mounting part 101 and the flange face of the wind turbine rotor inner tower, which is achieved using bolts. A through hole 103 is provided at the center of one side of the mounting part 101 along the axial direction. This through hole 103 allows the connector 3 to pass through. A limiting groove 104 is provided at the center of the opposite side along the axis of component 1. The limiting groove 104 is used to accommodate the distribution component 2, so that the distribution component 2 does not affect the connection between the load-bearing component 1 and the flange face of the inner tower of the wind turbine rotor. A buffer pipe 105 is provided around the bottom of the inner wall of the limiting groove 104. The buffer pipe 105 is annular and surrounds the limiting groove 104. The inside of the buffer pipe 105 is hollow. Therefore, when subjected to tension, the sealing piston 202 will be subjected to air pressure inside the buffer pipe 105. The inner wall of the buffer pipe 105 is smooth, which facilitates the sealing piston 202 to apply pressure inside the buffer pipe 105.

[0050] The distribution component 2 includes a push ring 201, a sealing piston 202, and a fixing rod 203. The push ring 201 is disposed in the limiting groove 104 and is annular. The push ring 201 is adapted to the buffer pipe 105. The side of the push ring 201 near the buffer pipe 105 is provided with the sealing piston 202. The sealing piston 202 is annular and is adapted to the buffer pipe 105. The inner side of the push ring 201 is provided with a fixing rod 203, which is used to install the connector 3.

[0051] The connector 3 includes a tension post 301 and a sliding part 302. The tension post 301 is a columnar structure and is compatible with the through hole 103. Optionally, the tension post 301 can be made of AH36 high-strength steel, which has tensile strength. The tension post 301 is set on the fixing rod 203, and the fixing rod 203 is arranged around the tension post 301. One side of the fixing rod 203 passes through the through hole 103. The end of the fixing rod 203 away from the fixing rod 203 is provided with the sliding part 302 through the groove. The sliding part 302 can be a rotating shaft, which is used to rotate with the rise of the main hook, so that the connection between the hoisting rope and the tension post 301 is smoother and the friction generated during rotation is reduced. It can be a shaft that bears both bending moment and torque during rotation.

[0052] Judgment criteria: When the hoisting is subjected to tension, the tension is distributed to various parts of the distribution component 2, which has an internal surface for hoisting, so that the stress surface is not concentrated on one side of the hoisting or on a local point of the hoisting, reducing the problem of flange surface deformation caused by uneven stress, and preventing flange surface deformation during suspension.

[0053] In summary, the beneficial effects of this invention are as follows: The wind turbine rotor inner tower hoisting method, through the coordinated arrangement of the load-bearing component 1, the distribution component 2, and the connecting component 3, ensures that the tensile force is evenly distributed across the distribution component 2 as the flange surface gradually changes from vertical to parallel. The distribution component 2 has an internal hoisting surface, preventing the load from concentrating on one side or at a localized point, thus reducing flange surface deformation caused by uneven stress. Furthermore, the distribution component 2 and the connecting component 3 are concealed within the load-bearing component 1, not affecting the use of the flange surface. This eliminates the need for welding lifting lugs, saving the process of removing them and protecting the already precision-machined flange surface.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for hoisting the inner tower of a wind turbine rotor, characterized in that, Includes the following steps: 1) Pre-treatment of the inner tower of the wind turbine rotor: complete the flange assembly and precision machining of the inner tower of the wind turbine rotor; 2) Installation and hoisting on each flange: Install the hoisting device on the flange; 3) Complete the connection between the hoisting and suspension devices: Connect the hoisting ropes of the suspension device to the hoisting equipment; 4) Pre-hoisting inspection: Check whether the hoisting is sealed and whether the connection between the hoisting device and the suspension device is stable; 5) Start the suspension device: vertically suspend the inner tower of the wind turbine rotor from the front and rear; The number of hoisting devices is two, and the two hoisting devices are respectively connected to the upper and lower flange surfaces of the inner tower of the wind turbine rotor. The hoisting device includes a load-bearing component (1), a distribution component (2), and a connecting component (3). The load-bearing component (1) is connected to the flange surface and is used to bear the tension of the hoisting rope. The distribution component (2) is set between the load-bearing component (1) and the flange surface and is used to distribute the tension evenly. The connecting component (3) is set between the distribution component (2) and the load-bearing component (1), and a part of the connecting component (3) passes through the load-bearing component (1) to the outside and is used to connect the hoisting rope. The force-bearing component (1) includes a mounting part (101), a threaded hole (102), a through hole (103), a limiting groove (104), and a buffer pipe (105). The mounting part (101) has a threaded hole (102) around one side along the axial direction. The mounting part (101) has a through hole (103) at the center of one side along the axial direction. The mounting part (101) has a limiting groove (104) at the center of the other side along the axial direction. The limiting groove (104) has a buffer pipe (105) around the bottom of the inner wall of the limiting groove (104). The sharing component (2) includes a push ring (201), a sealing piston (202) and a fixing rod (203). The push ring (201) is disposed in the limiting groove (104). The side of the push ring (201) near the buffer pipe (105) is provided with a sealing piston (202). The inner side of the push ring (201) is provided with a fixing rod (203). The connector (3) includes a tensile post (301) and a sliding part (302). The tensile post (301) is disposed on the fixing rod (203), and the fixing rod (203) is disposed around the tensile post (301). One side of the fixing rod (203) passes through the through hole (103), and the end of the fixing rod (203) away from the fixing rod (203) is provided with a sliding part (302) through an opening groove.

2. The method for hoisting the inner tower of a wind turbine rotor according to claim 1, characterized in that, The pretreatment of the inner tower of the wind turbine rotor is as follows: the upper and lower parts of the inner tower of the wind turbine rotor are connected to flanges with bolts, and the connection is welded after connection. After completion, the upper and lower flange surfaces are machined as a whole to achieve a flatness of 1mm on the upper and lower flange surfaces.

3. The method for hoisting the inner tower of a wind turbine rotor according to claim 1, characterized in that, The installation and hoisting on each flange specifically involves bolting the upper and lower flanges of the inner tower of the wind turbine rotor for hoisting. The hoisting components are pre-installed inside the load-bearing components, and the connecting components pass through the load-bearing components via through holes.

4. The method for hoisting the inner tower of a wind turbine rotor according to claim 1, characterized in that, The connection of the hoisting and suspension device is specifically completed by connecting the hoisting ropes of the two cranes to the upper and lower hoisting connectors respectively.

5. The method for hoisting the inner tower of a wind turbine rotor according to claim 1, characterized in that, The specific inspections before hoisting are as follows: check whether the flange bolts on the upper and lower parts of the inner tower of the wind turbine rotor are stably connected; check whether the flange welds on the upper and lower parts of the inner tower of the wind turbine rotor have welds; check whether the flange surfaces on the upper and lower parts of the inner tower of the wind turbine rotor meet the flatness standard; check whether the load-bearing components inside the hoisting are sealed; and check whether the connection between the hoisting equipment and the hoisting ropes at the upper and lower parts is stable.

6. The method for hoisting the inner tower of a wind turbine rotor according to claim 1, characterized in that, The specific method for starting the suspension device is as follows: according to the suspension requirements, the upper part of the inner tower is used as the main hook and the lower part of the inner tower is used as the auxiliary hook. The crane is started at the same time, and the main hook and auxiliary hook are used to lift the inner tower of the wind turbine rotor horizontally to prevent excessive pressure on the other side caused by lifting on one side. After the inner tower of the wind turbine rotor is lifted horizontally to a certain height, the crane at the main hook continues to lift while the crane at the auxiliary hook stops lifting, so that the inner tower of the wind turbine rotor begins to tilt and rise on one side. During the process, the crane at the auxiliary hook gradually lowers in coordination until the main hook is completely vertical, thus completing the suspension or vertical placement of the inner tower of the wind turbine rotor.

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