A self-hoisting device and self-hoisting method for a horizontal axis wind turbine generator

Abstract

The present invention discloses a self-hoisting device for a horizontal-axis wind turbine generator set and a self-hoisting method thereof. The self-hoisting device is composed of main legs, fixed arms, top covers, jacking legs, boom arms, translation trolleys, winches, lifting hooks, ropes and pulleys. The self-hoisting device is assembled at the bottom of the wind turbine tower and installed on the first section of the cylinder body by a crane. The top and bottom of the middle section of the cylinder body are respectively connected with a support flange and a coupling flange, and the outer diameter of the support flange is larger than the outer diameter of the cylinder section. Among them, the main legs fix the self-hoisting device on the support flange of the cylinder body through the fixed arms. After hoisting a new cylinder body, the self-hoisting device uses the jacking legs to lift its own height so as to complete the hoisting of the entire wind turbine generator set. After the hoisting is completed, the self-hoisting device can be disassembled at the top of the tower and lowered to the bottom of the tower in batches through tooling. The self-hoisting device is easy to assemble and disassemble, and the hoisting of the unit does not require the use of a conventional large crane, greatly reducing the project construction cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation, and particularly relates to a self-hoisting device for a horizontal-axis wind turbine generator set and a self-hoisting method thereof. Background Art

[0002] Wind power is the most valuable power generation method for large-scale development and commercial development prospects in the field of renewable energy. The available wind energy is widely distributed and has huge reserves globally.

[0003] The wind turbine generator set drives the impeller to rotate by means of blades, and finally converts mechanical energy into electrical energy through a generator. Along with the enlargement of the unit, the blade length is continuously increasing, the capacity of the unit and the load to be borne are continuously increasing. Therefore, the weight of the nacelle has increased from dozens of tons at the beginning of the development of wind power to hundreds of tons at present. It is very likely that the weight of the nacelle of onshore wind turbine generators will exceed two hundred tons in the near future, and it is easy for offshore units to reach more than five hundred tons. At the same time, due to the vertical wind shear effect, higher wind speeds exist at high altitudes. Therefore, the height of the hub center of the unit is gradually increasing. Currently, it has become a conventional configuration that the hub center height exceeds 100 meters, and it will soon be increased to more than 140 meters in the near future. The traditional hoisting method for wind turbine generators is to use a crane to hoist the tower barrel, nacelle and impeller. In the future, this hoisting method will surely face huge challenges in terms of both hoisting height and weight. The direct solution is to build a crane with a longer boom and a stronger hoisting tonnage, but the corresponding cost will increase significantly. A single onshore wind power project may cost millions only for hoisting, which has a great impact on the cost control of wind power projects. Further, in the future, the hub center of the unit will reach more than 200 meters, and building a crane with a boom exceeding 200 meters is not the best choice in terms of engineering feasibility and economy.

[0004] CN 202545121 U, CN 211310597 U, CN 201395498 Y and CN 103303807 B have all proposed technical solutions with built-in cranes, but these solutions are only applicable to the later maintenance of the hoisted units.

[0005] CN 101492143 B has proposed a hoisting device and a hoisting method, but it is only applicable to the hoisting of the nacelle.

[0006] CN201660378 U has proposed a tower crane device for a vertical-axis wind turbine generator set, but it is not suitable for a horizontal-axis wind turbine generator set.

[0007] CN 112780496 A proposes a self-lifting tower barrel and a scheme for lifting the tower barrel. This scheme increases the outer diameter of the entire lower barrel section and creates a boss as the support point of the lifting device through the outer diameter difference between the two end barrel sections. This scheme cannot achieve the self-lifting of the nacelle and the impeller, and at the same time, increasing the outer diameter of the entire barrel section will increase the cost.

[0008] CN 108533461 A proposes a self-lifting hoisting device for a wind turbine generator set and its hoisting method. This method uses a clamping brake to clamp the hoisting platform on the outer wall of the tower barrel as the support of the lifting device. The device proposed by this invention is too complex and time-consuming to disassemble. At the same time, relying on friction to provide support is a very unreliable scheme. In addition, due to the thin wall of the tower barrel, applying too much pressure to the outer wall of the tower barrel to create a huge friction force may cause local crushing or buckling of the barrel section. Summary of the Invention

[0009] In view of this, the purpose of the embodiments of the present invention is to provide a self-lifting device for a horizontal axis wind turbine generator set and its self-lifting method to solve at least one technical problem in the background technology.

[0010] To achieve the above object, in the first aspect, a self-lifting device for a horizontal axis wind turbine generator set is provided, which includes: main legs, fixed arms, top covers, jacking legs, boom arms, translation trolleys, winches, lifting hooks, ropes, and pulleys;

[0011] The fixed arm is connected to the main leg, the top of the main leg is connected to the top cover, the jacking leg and the boom arm are connected to the top cover. The number of the main legs is not less than 2, and the lengths of the fixed arm and the jacking leg can be adjusted;

[0012] The boom arm is provided with a track, and the translation trolley can move horizontally on the boom arm along the track;

[0013] Pulleys are installed on the top cover, the translation trolley, and the boom arm. The rope passes around these pulleys and connects the lifting hook to the winch located at the bottom of the tower of the wind turbine generator set.

[0014] In the second aspect, a self-lifting method for a self-lifting device of a horizontal axis wind turbine generator set is provided, which includes the following steps:

[0015] S1. Install the first section of the barrel on the foundation or tower of the wind turbine generator set by a crane;

[0016] S2. Retract the jacking legs of the self-lifting device to the minimum length, adjust the length of the fixed arm, and fix the self-lifting device after docking the fixed arm with the barrel support flange surface;

[0017] S3. Move the translation trolley above the next section of the cylinder body, start the winch, and lower the lifting hook.

[0018] S4. Hook the next section of the cylinder body with the lifting hook, start the winch, and lift the next section of the cylinder body to a height close to that of the translation trolley.

[0019] S5. Move the translation trolley to approximately directly below the top cover and also approximately directly above the previous section of the cylinder body. Start the winch and lower the lifting hook.

[0020] S6. Connect the two sections of the cylinder body with bolts. Adjust the length of the jacking leg until it is butt - jointed with the top flange of the newly hoisted cylinder body, and connect the jacking leg and the top flange of the cylinder body with bolts.

[0021] S7. Adjust the length of the fixed arm to the minimum length and release the butt - joint between the fixed arm and the support flange of the cylinder body.

[0022] S8. Adjust the length of the jacking leg to lift the top cover, the lifting arm, the main leg, and the fixed arm. Stop when the fixed arm is approximately at the butt - joint height with the support flange at the top of the newly hoisted cylinder body, and adjust the length of the fixed arm until it is butt - jointed with the support flange of the newly hoisted cylinder body.

[0023] S9. Remove the bolt connection between the jacking leg and the top flange of the cylinder body, and adjust the length of the jacking leg to the minimum length.

[0024] S10. Complete the hoisting of the remaining cylinder body and the nacelle according to the steps described in steps S3 to S9.

[0025] The beneficial effects of the above - mentioned technical solution include:

[0026] In the embodiment of the present invention, the support flange of the cylinder body protrusion provides support for the main leg of the self - hoisting device. The hoisting of the tower, nacelle, and impeller of the unit is completed by using the lifting arm, translation trolley, lifting hook, pulley block, and the winch located at the bottom of the tower. At the same time, the self - hoisting device can automatically lift the height during the hoisting of the unit. The self - hoisting device is easy to assemble and disassemble. The hoisting of the unit does not require the use of conventional large - scale cranes, which greatly reduces the project construction cost and is especially suitable for large - capacity and high - tower wind turbines. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of a self - hoisting device for a horizontal - axis wind turbine in an embodiment of the present invention;

[0028] Figure 2 It is a lifting schematic diagram of a self - hoisting device for a horizontal - axis wind turbine in an embodiment of the present invention;

[0029] Figure 3Partial schematic diagram of a self-hoisting device for a horizontal-axis wind turbine generator according to an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of a tower barrel of a horizontal-axis wind turbine generator according to an embodiment of the present invention;

[0031] Figure 5 Cross-sectional view of a tower barrel of a horizontal-axis wind turbine generator according to an embodiment of the present invention;

[0032] Figure 6 Schematic diagrams of two tower structures of a horizontal-axis wind turbine generator according to an embodiment of the present invention;

[0033] Figure 7 Schematic diagram after disassembling the self-hoisting device of a horizontal-axis wind turbine generator according to an embodiment of the present invention;

[0034] Figure 8 The first part of the flowchart of the self-hoisting method of the self-hoisting device of a horizontal-axis wind turbine generator according to an embodiment of the present invention;

[0035] Figure 9 The second part of the flowchart of the self-hoisting method of the self-hoisting device of a horizontal-axis wind turbine generator according to an embodiment of the present invention.

[0036] Explanation of the reference numerals in the drawings:

[0037] 1. Barrel; 2. Barrel section; 3. Support flange; 4. Connecting flange; 5. Bolt hole; 6. Main leg; 7. Fixed arm; 8. Tie rod; 9. Top cover; 10. Jacking leg; 11. Boom; 12. Translation trolley; 13. Winch; 14. Lifting hook; 15. Rope; 16. Pulley; 17. Nacelle; 18. Base; 19. Lowering hook; 20. Hoist; 21. Bracket; 22. Foundation of the wind turbine generator; 23. Truss.

[0038] It should be noted that the above-mentioned drawings are used to illustrate the features of the present invention, and are not intended to show any actual structure or reflect details such as the dimensions and relative proportions of various components. In order to more clearly show the principle of the present invention and to avoid obscuring the principle of the present invention with unnecessary details, the examples in each figure have been simplified. These drawings will not cause inconvenience to those skilled in the relevant art in understanding the present invention, and the actual tower of the horizontal-axis wind turbine generator and the self-hoisting device may include more components. Detailed implementation manners

[0039] For the purpose of making the objectives and technical solutions of the embodiments of the present invention clearer, the following will provide a complete description of the embodiments of the present invention in conjunction with the relevant drawings of the embodiments of the present invention. This patent only describes a part of the embodiments, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0040] As Figure 1 Figure 3 shown, a self-hoisting device for a horizontal axis wind turbine generator set includes: main legs 6, fixed arms 7, top covers 9, jacking legs 10, boom arms 11, translation trolleys 12, hoists 13, lifting hooks 14, ropes 15, and pulleys 16.

[0041] The fixed arm 7 is connected to the main leg 6, the top of the main leg 6 is connected to the top cover 9, and both the jacking leg 10 and the boom arm 11 are connected to the top cover 9. Among them, the number of main legs 6 is not less than 2; the connections between the main legs 6 and the top cover 9, and between the jacking legs 10 and the boom arms 11 and the top cover 9 are detachable, and the assembly and disassembly work can be completed through corresponding tooling. The extending direction of the jacking leg 10 is along the vertical direction, and the number thereof can be multiple; the extending direction of the boom arm 11 is along the horizontal direction; the extending direction (length direction) of the main leg 6 is along the vertical direction.

[0042] The top cover 9 is connected to multiple components at the same time and is the main component that bears the gravity loads from the cylinder body and the nacelle. The shape of the top cover 9 is related to the number of main legs 6. In some embodiments, for the purpose of achieving stable support, the number of main legs 6 can be 4, and the top cover 9 can adopt a cubic structure with a certain thickness. The main legs 6 are respectively connected to the four corners of the top cover 9. The top cover 9 adopts a detachable design, which is convenient for disassembly and lowering after hoisting.

[0043] The lengths of the fixed arm 7 and the jacking leg 10 can be adjusted. In some embodiments, the length adjustment can be achieved through a hydraulic system. The hydraulic systems of the fixed arm 7 and the jacking leg 10 can be designed independently, such as hydraulic stations and other equipment are respectively arranged on the main leg 6 and the top cover 9.

[0044] The boom 11 is provided with a track, and the translation trolley 12 can move horizontally on the boom 11 along the track. Pulleys 16 are installed on the top cover 9, the translation trolley 12 and the boom 11. The rope 15 passes around these pulleys 16 to connect the lifting hook 14 with the winch 13 located at the bottom of the wind turbine tower. The lifting hook 14 and the translation trolley 12 are not directly connected, and the lifting hook 14 is located below the translation trolley 12. In one possible solution, one end of the rope 15 is fixed to the translation trolley 12, and the other end passes around the lifting hook 14 and multiple pulleys 16 to be connected with the winch 13; another possible solution is: one end of the rope 15 is connected to the winch 13, the other end of the rope 15 is connected to the lifting hook 14, and in the middle it passes around multiple pulleys 16 located on the boom 11, the top cover 9 and the translation trolley 12. The translation trolley 12 is equivalent to a movable pulley for the lifting hook 14. Therefore, the above two solutions can be summarized as: one end of the rope 15 is connected to the winch 13, the other end of the rope 15 is connected to the lifting hook 14, and in the middle it passes around the pulleys 16 located on the boom 11, the top cover 9 and the translation trolley 12.

[0045] As Figure 4 and Figure 5 shown, the tower included in a horizontal axis wind turbine tower includes at least 1 section of cylinder 1. If it includes multiple sections of cylinders, two adjacent sections of cylinders 1 are connected by bolts. Each section of cylinder 1 includes a cylinder section 2 and two flanges; the top of the cylinder section 2 is connected to the support flange 3, and the bottom of the cylinder section 2 is connected to the connection flange 4. The outer diameter of the support flange 3 is larger than the outer diameter of the connection part between the cylinder section 2 and this support flange 3. A platform is made on the outer side of the cylinder 1, which can provide support points for the main leg 6 and the fixed arm 7. The outer diameter of the connection flange 4 is approximately equal to the outer diameter of the connection part between the cylinder section 2 and this flange, which is similar to a conventional cylinder section. The bolt hole positions of the connection flange 4 and the support flange 3 are located inside the cylinder 1.

[0046] Since the part of the support flange located outside the cylinder 1 is used to provide support for the main leg 6 and the fixed arm 7, the bolt hole 5 position of the support flange 3 can only be located inside the cylinder 1.

[0047] In some embodiments, the self-lifting device further includes a length adjustment component for adjusting the length of the fixed arm 7 to make the fixed arm 7 dock with the support flange 3. By adjusting the length of the fixed arm 7, the docking of the fixed arm 7 with the support flange 3 is realized. There are multiple fixed arms 7 connected to each main leg 6. The main leg 6 is fixed by the docking of these multiple fixed arms 7 with multiple faces (such as the top face, side face, bottom face) of the support flange 3 respectively. The number of main legs 6 is not less than 2. This configuration provides reliable support for the entire self-lifting device.

[0048] In some embodiments, the boom 11 can be divided into multiple sections for assembly or disassembly, and several tie rods 8 or cables are provided between the boom 11 and the top cover 9 for connection. One end of the tie rod 8 or cable is connected to the top cover 9, and the other end is connected to the boom 11. There can be multiple connection points of the tie rod 8 or cable on the boom 11, that is, one end of the tie rod 8 or cable can be fixed to a certain section of the boom 11, rather than a specific section.

[0049] In some embodiments, the fixed arm 7 is used to fix the main leg 6 on the support flange 3 of the cylinder 1; the main leg 6 is used to support the top cover 9; the length of the lifting leg 10 can be adjusted by a length adjusting component, and is used to lift the top cover 9, the main leg 6 and the boom 11 connected to the top cover 9, so that the self-lifting device can achieve height increase. The maximum length of the lifting leg 10 is approximately equal to the length of the main leg 6; the translation trolley 12 is used to move above the component to be lifted and the installation position; the lifting hook 14 is used to hook the component to be lifted and can move together with the translation trolley 12; the winch 13 is used to lift the component to be lifted from the bottom of the wind turbine tower through the lifting hook 14 and the rope 15, or lower the component to be lifted to the bottom of the tower. Among them, the components to be lifted include: the cylinder 1 of the wind turbine tower, the nacelle 17 of the wind turbine, the hub of the wind turbine or the blade of the wind turbine; among them, the installation positions include: the cylinder 1, the nacelle 17 of the wind turbine or the hub of the wind turbine.

[0050] The hydraulic rod of the lifting leg 10 can include a fixed end and a movable end. One end abuts against the support flange 3 of the cylinder 1, and the other end is fixedly connected to the top cover 9. One of the two connected ends is the fixed end and the other is the movable end. The fixed end and the movable end can be interchanged according to the specific scheme as long as relative movement can occur. The self-lifting device is lifted by relative movement (the reaction force generated by the hydraulic pressure).

[0051] In some embodiments, the length of the main outrigger 6 should be approximately equal to that of the lifting outrigger 10, i.e., the maximum length when the hydraulic rod extends, so as to ensure that after the self-hoisting device lifts to a certain height, the main outrigger 6 can be re-fixed on the support flange 3. The distance from the top cover 9 to the already installed support flange 3 should be greater than the height of the first section of the cylinder (because the height and width of the first section of the wind turbine cylinder are greater than those of other cylinders and the nacelle). Usually, the height of the first section of the cylinder is between 20 and 30 meters, and the outer diameter is close to 5 meters. The smaller the length of the main outrigger 6, the better. If the first section of the cylinder is 26 meters high, the height of the main outrigger is about 28 meters, which is sufficient. That is to say, after hoisting the new cylinder (assuming the new cylinder is also 26 meters), the distance from the lower end of the top cover 9 to the support flange of the new cylinder is only 2 meters. After the hydraulic rod of the lifting outrigger 10 retracts to the minimum length, the distance from its bottom end to the support flange of the new cylinder should be less than 2 meters, otherwise there will be interference during hoisting. If it is also necessary to meet the requirement that the hydraulic rod of the lifting outrigger 10 can extend to about 28 meters, the hydraulic cylinder can only be located above the top cover 9, but not necessarily all above, at least a large part of it is above.

[0052] In some embodiments, the nacelle 17 of the wind turbine generator is provided with a detachable nacelle cover; or the nacelle 17 is provided with a nacelle cover that can move along the top.

[0053] As Figure 7 shown, in some embodiments, a self-hoisting device for a horizontal axis wind turbine generator further includes:

[0054] The support 21 is used to be installed under the top cover 9 after the entire cylinder body 1 and the nacelle 17 of the wind turbine generator are hoisted. The top of the support is connected to the top cover 9, and the bottom is connected to the base 18 in the nacelle 17 of the wind turbine generator; the installation tooling is used to assemble the main leg 6, the fixed arm 7, the top cover 9, the jacking leg 10, the boom 11, the translation trolley 12, the winch 13, the lifting hook 14, the rope 15 and the pulley 16 according to the connection relationship to form a self-hoisting device for the horizontal axis wind turbine generator; it is also used to assemble the support 21, the top cover 9 and the wind turbine generator base 18 according to the connection relationship after the entire cylinder body 1 and the nacelle 17 of the wind turbine generator are hoisted; the disassembly tooling is used to disassemble the main leg 6 from the top cover 9, or disassemble the boom 11 from the top cover 9, or disassemble the boom 11 from the translation trolley 12 and the lifting hook 14 after the cylinder body 1 and the nacelle 17 of the wind turbine generator are hoisted; the lowering hook 19 is connected to the winch 13 through the rope 15 and is used to hook the main leg 6, a part of the boom 11 (i.e., the first segmented component of the boom 11), the translation trolley 12 and the lifting hook 14; and, the hoist 20 is used to lower the support 21, the top cover 9, the remaining boom 11 (the second segmented component of the boom), the rope 15 and the pulley 16 to the bottom of the wind turbine tower after the main leg 6, a part of the boom 11 (the first segmented component of the boom), the translation trolley 12 and the lifting hook 14 are lowered to the bottom of the wind turbine tower. For example, after the tower and the nacelle are hoisted, half of the boom 11 can be disassembled first, and the remaining half is used as the support for the components such as the lower main leg and the translation trolley.

[0055] Refer to Figures 8 - 9 , the working principle and process of the self-hoisting device of the horizontal axis wind turbine generator to achieve hoisting include the following steps:

[0056] S1. Install the first section of the cylinder body 1 on the foundation 22 or the tower of the wind turbine generator by a crane (an ordinary truck crane can be used). As Figure 6 shown in the right side drawing of Figure 6 , if the wind turbine generator only uses the tower barrel as the support, the first section of the cylinder body 1 is directly fixed on the foundation 22; as shown in the left side drawing of Figure 6 , if the wind turbine generator uses a hybrid tower, the first section of the cylinder body 1 can be installed on the truss 23 of the tower that has been installed in advance below. In wind power, the "tower barrel" generally refers to a steel cylindrical tower, while the tower is a more general name, not only referring to a steel cylindrical tower, but also a truss tower, a concrete tower, or a hybrid tower, etc. In this embodiment, devices such as the winch 13 are placed on the ground, but the first section of the cylinder body 1 is not necessarily on the ground and may be placed on a truss 23. At this time, the height of the truss 23 may have reached dozens of meters.

[0057] S2. Use a crane and installation tooling to assemble the main outrigger 6, fixed boom 7, top cover 9, jacking outrigger 10, lifting boom 11, translation trolley 12, winch 13, lifting hook 14, rope 15, and pulley 16 according to the connection relationship to obtain the self-lifting device of the wind turbine generator. Retract the jacking outrigger 10 to the minimum length, and adjust the length of the fixed boom 7 so that after the fixed boom 7 is butted against the support flange 3 of the cylinder 1, fix the self-lifting device.

[0058] S3. Move the translation trolley 12 above the next section of the cylinder 1, start the winch 13, and lower the lifting hook 14.

[0059] S4. Hook the next section of the cylinder 1 with the lifting hook 14, start the winch 13, and lift the next section of the cylinder 1 to a height close to that of the translation trolley 12.

[0060] S5. Move the translation trolley 12 to approximately directly below the top cover 9 and also approximately directly above the previous section of the cylinder 1, start the winch 13, and lower the lifting hook 14.

[0061] S6. Connect the two sections of the cylinder 1 by bolts, adjust the length of the jacking outrigger 10 until it butts against the top support flange 3 of the newly hoisted cylinder 1. If necessary, add fixing tooling between the jacking outrigger 10 and the support flange 3, and connect the jacking outrigger 10 and the top support flange 3 of the cylinder by bolts.

[0062] S7. Adjust the length of the fixed boom 7 to the minimum length and release the butt joint between the fixed boom 7 and the support flange 3 of the cylinder 1.

[0063] S8. Adjust the length of the jacking outrigger 10 to lift the top cover 9, lifting boom 11, main outrigger 6, and fixed boom 7. Stop when the fixed boom 7 is approximately at the butt joint height with the support flange 3 at the top of the newly hoisted cylinder 1, and adjust the length of the fixed boom 7 until the fixed boom 7 butts against the support flange 3 of the newly hoisted cylinder 1.

[0064] S9. Remove the bolt connection between the jacking outrigger 10 and the top support flange 3 of the cylinder 1, and adjust the length of the jacking outrigger 10 to the minimum length.

[0065] S10. Complete the hoisting of the remaining cylinder 1 and / or nacelle according to the steps of S3 - S9.

[0066] In a further embodiment, refer to Figure 9 As shown, when other components of the wind turbine generator need to be hoisted, the following steps are further included:

[0067] S11. Move the translation trolley 12 to above the nacelle 17 at the bottom of the wind turbine tower. Start the winch 13, lower the lifting hook 14, and place the bracket 21, the lower hook 19, the installation tooling, the rotation tooling, the disassembly tooling, and the hoist 20 in the nacelle 17 in advance.

[0068] S12. Since the weight of the nacelle 17 is greater than that of the aforementioned hoisted cylinder 1, some counterweights (such as iron blocks, etc.) can be added to the winch 13 at this time to ensure the lifting weight of the self-hoisting device. Then, hook the nacelle 17 with the lifting hook 14, start the winch 13, and hoist the nacelle 17 to a height close to that of the translation trolley 12.

[0069] S13. Move the translation trolley 12 to below the top cover 9 and also above the support flange 3 of the topmost section of the cylinder 1. Align the flange at the bottom of the base 18 in the nacelle 17 with the support flange 3 of the cylinder 1, and start the winch 13 to lower the lifting hook 14.

[0070] S14. Complete the connection between the base 18 of the wind turbine generator and the support flange 3 of the cylinder.

[0071] S15. Complete the hoisting of the hub and blades in a method similar to steps S11 - S13.

[0072] S16. As shown, open the nacelle cover on the top of the nacelle 17, connect the bottom of the bracket 21 to the base 18 in the nacelle 17, connect the top of the bracket 21 to the top cover 9, disconnect the rope 15 from the lifting hook 14, bypass the rope 15 around the pulley 16 above the top cover 9 and connect it to the lower hook 19, and place the lower hook 19 on the side of the top cover 9. Since the winch 13 is on the ground behind the top cover 9 and the lower hook 19 is on the side of the top cover 9. Therefore, in some embodiments, in order to complete the approximate 90-degree deflection of the rope 15 during movement, at least one pulley block consisting of 3 pulleys is required at the top of the top cover 9. As shown, among the 3 pulleys: the axis of the first pulley is approximately parallel to the top cover 9 and approximately perpendicular to the movement direction of the translation trolley 12 (i.e., the front-back direction of the nacelle 17); the axis of the second pulley is approximately perpendicular to the top cover; the axis of the third pulley is approximately parallel to the top cover 9 and approximately parallel to the movement direction of the translation trolley 12 (i.e., the front-back direction of the nacelle 17). According to this arrangement, the rope 15 bypasses the 3 pulleys in sequence, and an approximate 90-degree deflection can be achieved. Figure 6 shown, open the nacelle cover on the top of the nacelle 17, connect the bottom of the bracket 21 to the base 18 in the nacelle 17, connect the top of the bracket 21 to the top cover 9, disconnect the rope 15 from the lifting hook 14, bypass the rope 15 around the pulley 16 above the top cover 9 and connect it to the lower hook 19, and place the lower hook 19 on the side of the top cover 9. Since the winch 13 is on the ground behind the top cover 9 and the lower hook 19 is on the side of the top cover 9. Therefore, in some embodiments, in order to complete the approximate 90-degree deflection of the rope 15 during movement, at least one pulley block consisting of 3 pulleys is required at the top of the top cover 9. As shown, among the 3 pulleys: the axis of the first pulley is approximately parallel to the top cover 9 and approximately perpendicular to the movement direction of the translation trolley 12 (i.e., the front-back direction of the nacelle 17); the axis of the second pulley is approximately perpendicular to the top cover; the axis of the third pulley is approximately parallel to the top cover 9 and approximately parallel to the movement direction of the translation trolley 12 (i.e., the front-back direction of the nacelle 17). According to this arrangement, the rope 15 bypasses the 3 pulleys in sequence, and an approximate 90-degree deflection can be achieved. Figure 7 shown, among the 3 pulleys: the axis of the first pulley is approximately parallel to the top cover 9 and approximately perpendicular to the movement direction of the translation trolley 12 (i.e., the front-back direction of the nacelle 17); the axis of the second pulley is approximately perpendicular to the top cover; the axis of the third pulley is approximately parallel to the top cover 9 and approximately parallel to the movement direction of the translation trolley 12 (i.e., the front-back direction of the nacelle 17). According to this arrangement, the rope 15 bypasses the 3 pulleys in sequence, and an approximate 90-degree deflection can be achieved.

[0073] S17. Use the disassembly tooling to remove the jacking leg 10 connected to the top cover 9, remove the translation trolley 12 and the lifting hook 14 from the boom 11, disassemble part of the boom 11, and lower part of the boom 11, the translation trolley 12, and the lifting hook 14 to the bottom of the wind turbine tower through the lower hook 19 and the winch 13.

[0074] S18. Hook the main outrigger 6 with the lowering hook 19, disassemble the main outrigger 6 and the top cover 9 using the disassembly tooling, and start the winch 13 to lower the main outrigger 6 to the bottom of the wind turbine tower. In order to complete the disassembly and lowering of the main outriggers 6 on both sides of the top cover 9, after lowering the main outrigger 6 on one side of the top cover 9, the lowering hook 19 needs to be installed on the other side of the top cover 9 according to the description in S16.

[0075] S19. After the lowering hook 19 can be lowered to the bottom of the wind turbine tower, disconnect the connection between the rope 15 and the lowering hook 19, and disassemble the top cover 9, the remaining boom 11, and the support 21 using the disassembly tooling.

[0076] S20. Use the hoist 20 to lower the top cover 9, the remaining boom 11, the rope 15, the pulley 16, and the support 21 to the bottom of the wind turbine tower through the nacelle lifting hole or the top of the nacelle 17.

[0077] The technical effects corresponding to the technical features involved in the present invention are as follows:

[0078] 1. The top of the cylinder body is provided with a support flange whose outer diameter is larger than that of the cylinder section, which can provide support for the self-hoisting device during the hoisting of the cylinder body.

[0079] 2. The length of the jacking outrigger can be adjusted, and the self-hoisting device can achieve the effect of self-lifting by adjusting its own length during the hoisting process.

[0080] 3. The main outrigger is provided with a fixed arm with length adjustment, which can provide connection between the main outrigger and the support flange, and can also adjust the length to avoid interference with the support flange during the self-lifting process of the self-hoisting device (through the jacking outrigger).

[0081] 4. The hoisting of the object to be hoisted on the ground (such as the cylinder body and the nacelle) to the air is achieved through the winch, the rope, the pulley, the support arm, the translation trolley, and the lifting hook. At the same time, some components in the self-hoisting device at the top of the tower can also be lowered to the bottom of the tower.

[0082] 5. After the hoisting is completed, the self-hoisting device is disassembled at the top of the tower and lowered to the bottom of the tower using the disassembly tooling, the support, the lower hook, and the hoist.

[0083] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper, lower, inner, and outer" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 construed as a limitation to the present invention. In addition, the terms "first, second, or third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0084] Unless otherwise clearly defined and limited in the present invention, the terms "installation, connection, and coupling" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may also be a mechanical connection, an electrical connection, or a direct connection, or may be indirectly connected through an intermediate medium, or may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention may be understood according to specific circumstances.

[0085] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A self-hoisting device for a horizontal axis wind turbine generator, characterized in that, The self-hoisting device includes: Main outriggers, a fixed arm, a top cover, lifting outriggers, a boom, a translation trolley, a winch, a lifting hook, ropes, and pulleys; The fixed arm is connected to the main outriggers, the top of the main outriggers is connected to the top cover, and the lifting outriggers and the boom are respectively connected to the top cover; the number of the main outriggers is not less than 2; The lengths of the fixed arm and the lifting outriggers can be adjusted; The boom is provided with a track, and the translation trolley can move on the boom along the track; Pulleys are installed on the top cover, the translation trolley, and the boom, and the ropes bypass these pulleys to connect the lifting hook with the winch located at the bottom of the tower of the wind turbine generator; The tower of the wind turbine generator includes at least one section of cylinder, and each section of cylinder includes a cylinder section and two flanges; The top of the cylinder section is connected to the support flange, and the bottom of the cylinder section is connected to the connection flange; The outer diameter of the support flange is larger than the outer diameter of the cylinder section at the connection with the support flange, the outer diameter of the connection flange is equal to the outer diameter of the cylinder section at the connection with the connection flange, and the bolt hole positions of the connection flange and the support flange are located inside the cylinder; The self-hoisting device further includes a length adjustment component for adjusting the length of the fixed arm to dock the fixed arm with the support flange; The fixed arm is used to fix the main outriggers on the support flange of the cylinder; The main outriggers are used to support the top cover; The length of the lifting outriggers can be adjusted by the length adjustment component, and is used to lift the top cover, the main outriggers and the boom connected to the top cover, so that the self-hoisting device realizes height increase. The maximum length of the lifting outriggers is equal to the length of the main outriggers; The lifting outriggers can be bolt-connected to the support flange at the top of the cylinder; A bracket is used to be installed under the top cover after all the cylinders and the nacelle of the wind turbine generator are hoisted. The top of the bracket is connected to the top cover, and the bottom of the bracket is connected to the base in the nacelle of the wind turbine generator.

2. The self-hoisting device for a horizontal axis wind turbine generator according to claim 1, characterized in that, The self-hoisting device further includes a length adjustment component for adjusting the length of the fixed arm to dock the fixed arm with the support flange.

3. The self-hoisting device for a horizontal axis wind turbine generator according to claim 2, characterized in that: The boom is assembled by a plurality of segmented components, and the boom can be disassembled into a plurality of segmented components. A number of tie rods or cables are connected between the boom and the top cover.

4. The self-hoisting device for a horizontal axis wind turbine generator according to claim 2, characterized in that: The translation trolley is used to move above the component to be hoisted and / or the installation position; The lifting hook is used to hook the component to be hoisted and can move together with the translation trolley; The winch is used to lift the component to be hoisted from the bottom of the tower of the wind turbine generator through the lifting hook and the ropes, or to lower the component to be hoisted to the bottom of the tower.

5. The self-hoisting device for a horizontal axis wind turbine generator according to claim 4, characterized in that: The components to be hoisted include: the cylinder of the tower of the wind turbine generator, the nacelle of the wind turbine generator, the hub of the wind turbine generator, or the blade of the wind turbine generator; The installation positions include: the position where the cylinder of the tower of the wind turbine generator set is located, the position where the nacelle of the wind turbine generator set is located, or the position where the hub of the wind turbine generator set is located.

6. The self-hoisting device for a horizontal axis wind turbine generator according to claim 2, characterized in that: A detachable nacelle cover is provided on the top of the nacelle of the wind turbine generator set; alternatively, the nacelle is provided with a nacelle cover capable of moving along the top of the nacelle.

7. The self-hoisting device for a horizontal axis wind turbine generator according to claim 1, characterized in that, further Including: An installation tooling for assembling the main leg, fixed arm, top cover, jacking leg, boom, translation trolley, winch, lifting hook, rope and pulley according to the connection relationship to form a self-hoisting device for a horizontal-axis wind turbine generator set; Alternatively, after the hoisting of all the cylinders and the nacelle of the wind turbine generator set is completed, assembling the bracket, top cover and the base of the wind turbine generator set according to the connection relationship.

8. The self-hoisting device for a horizontal axis wind turbine generator according to claim 7, characterized in that, further Including: A disassembly tooling for disassembling the main leg and the top cover, or disassembling the boom and the top cover, or disassembling the boom, the translation trolley and the lifting hook after the hoisting of all the cylinders and the nacelle of the wind turbine generator set is completed; A lowering hook connected to the winch through the rope, for hooking the main leg, the first segmented component of the boom, the translation trolley and the lifting hook; A hoist provided in the nacelle, for lowering the bracket, the top cover, the second segmented component of the boom, the rope and the pulley to the bottom of the tower of the wind turbine generator set after the main leg, the first segmented component of the boom, the translation trolley and the lifting hook are lowered to the bottom of the tower of the wind turbine generator set.

9. A self-hoisting method for a self-hoisting device of a horizontal axis wind turbine generator, characterized in that, Based on the self-hoisting device for a horizontal-axis wind turbine generator set according to any one of claims 2-8, the self-hoisting method includes the following steps: S1. Install the first section of the cylinder on the foundation or tower of the wind turbine generator set by a crane; S2. Retract the jacking leg of the self-hoisting device to the minimum length, adjust the length of the fixed arm, and fix the self-hoisting device after the fixed arm is docked with the support flange of the cylinder; S3. Move the translation trolley above the next section of the cylinder, start the winch, and lower the lifting hook; S4. Hook the next section of the cylinder with the lifting hook, start the winch, and lift the next section of the cylinder to a height close to the height of the translation trolley; S5. Move the translation trolley directly below the top cover, start the winch, and lower the lifting hook; S6. Connect the two sections of the cylinder through a connecting piece, adjust the length of the jacking leg to be docked with the support flange at the top end of the cylinder hoisted last time, and connect the jacking leg and the flange at the top end of the cylinder through a connecting piece; S7. Adjust the length of the fixed arm to the minimum length, and release the docking of the fixed arm and the support flange of the cylinder; S8. Adjust the length of the jacking leg to jack up the top cover, boom, main leg and fixed arm, stop when the fixed arm is at the docking height with the support flange at the top of the cylinder hoisted last time, and adjust the length of the fixed arm to be docked with the flange of the support flange of the cylinder hoisted last time; S9. Remove the bolt connection between the jacking leg and the flange surface at the top of the cylinder, and adjust the length of the jacking leg to the minimum length; S10. Complete the hoisting of the remaining cylinder and the nacelle according to the steps described in steps S3 to S9.

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