Floating foundation of offshore floating type wind driven generator and fan platform

Abstract

The utility model discloses an offshore floating type wind driven generator floating type foundation and a fan platform, belongs to the technical field of floating type offshore wind power, is used for improving the motion performance of the fan platform, and is technically characterized by comprising an upper-layer heaving cabin; the first buoyancy tank is arranged on the upper-layer heaving cabin and is used for supporting the offshore floating type wind driven generator; the upper-layer heaving cabin and the lower-layer heaving cabin are oppositely arranged up and down; the second buoyancy tanks are arranged between the cabin bodies of the upper-layer heaving cabin and the lower-layer heaving cabin at intervals and are communicated with the cabin bodies of the upper-layer heaving cabin and the cabin bodies of the lower-layer heaving cabin; the third buoyancy tank comprises an arc-shaped part and two end parts, the two end parts are arranged on the lower-layer heaving cabin, are provided with different spaced areas and are communicated with a cabin body of the lower-layer heaving cabin, the lowest area of the arc-shaped part is arranged below the second central hollow circular space of the lower-layer heaving cabin, and the lower-layer heaving cabin is communicated with the second central hollow circular space of the lower-layer heaving cabin. And the lower-layer heaving cabin corresponds to the central area of the second central hollow circular space of the lower-layer heaving cabin.

Description

Technical Field

[0001] The utility model belongs to the technical field of floating offshore wind power, and in particular relates to a floating foundation of an offshore floating wind turbine generator and a wind turbine platform. Background Art

[0002] With the rapid development of the global economy, the global population continues to rise. Energy has become a key factor restricting national economic development. Traditional non-renewable energy sources, mainly oil and coal, can no longer meet human needs. Coupled with the increasingly serious problem of global warming, the development of renewable energy has become an important part of the development strategy of various countries. Vigorously developing offshore wind power is an important measure to implement the "dual carbon" goal and increase the proportion of clean energy.

[0003] Since the ocean occupies more than 70% of the global area, there is a huge space for the construction of offshore wind farms. The advantages of wind power and wind energy density can unleash huge potential. In recent years, the global offshore wind power generation technology has made rapid progress, the capacity of a single device has been greatly improved, and the water depth has become deeper and deeper, especially in the marine environment above 50m. The floating platform of offshore wind turbines has more development prospects than fixed foundations due to its advantages such as mobility and easy dismantling, and has become the best choice for deep-sea wind power generation. Floating offshore wind power technology is the key to the development of deep-sea wind resources. The floating foundation supports the upper wind turbines and is connected to the seabed through a mooring system. It is less affected by the water depth, frees itself from the constraints of complex seabed terrain and geological conditions, has a wider range of applications, and can obtain more wind energy resources. As one of the main forms of deep-sea wind energy development in the future, floating offshore wind power has great development potential and is also a research hotspot worldwide.

[0004] The existing floating foundation of offshore floating wind turbines mainly uses a single heave tank structure, and its motion performance needs to be improved. In addition, in addition to the necessary installation, the cabin of the heave tank also has available storage space. If this space can provide storage space for offshore oil and gas development, it can realize the linkage between floating platforms and oil and gas development, realize the rational use of resources, and solve some offshore oil and gas development and storage problems. On the other hand, although there are solutions for combining offshore wind power generation with offshore aquaculture, the aquaculture tanks are usually installed directly on the pontoons or columns, which makes the existing platforms unable to provide the aquaculture tanks with the ability to withstand huge winds and waves, and the existing platforms do not have the functions of flexibly retracting and releasing aquaculture cages and facilitating the salvage of seafood, and cannot meet today's aquaculture requirements. Utility Model Content

[0005] In order to overcome the problems existing in the prior art, the utility model has two heave tanks arranged relatively to improve the motion performance of the wind turbine platform, and further combines the floating wind turbine platform with aquaculture cages and oil and gas storage, which can effectively solve the multiple technical problems of low resource utilization of offshore floating wind turbine platforms, difficulties in offshore fishery farming, and high cost of deep-sea mineral resource mining. The utility model is of great significance to the development of deep-sea energy.

[0006] According to some embodiments of the present application, the floating foundation of an offshore floating wind turbine includes:

[0007] The upper heave tank has a first central hollow circular space formed in the middle of the tank;

[0008] A first buoyancy tank is arranged in the upper heave tank and supports the offshore floating wind turbine;

[0009] The lower heave tank has a second central hollow circular space formed in the middle of the tank body, and the upper heave tank and the lower heave tank are arranged opposite to each other up and down;

[0010] A second buoyancy tank is disposed between the upper heave tank and the lower heave tank, and is communicated with the upper heave tank and the lower heave tank;

[0011] The third buoyancy tank includes an arc-shaped portion and two end portions, wherein the two end portions are arranged in different areas with intervals on the lower swing tank and are connected to the body of the lower swing tank, and the lowest area of ​​the arc-shaped portion is arranged below the second central hollow circular space of the lower swing tank and corresponds to the central area of ​​the second central hollow circular space of the lower swing tank.

[0012] According to the floating foundation of the offshore floating wind turbine in some embodiments of the present application, the two ends of different third pontoons are spaced apart in different areas with intervals on the lower heave tank, the lowest areas of the arc-shaped parts of different third pontoons intersect and are connected, and are arranged below the second central hollow circular space of the lower heave tank, and correspond to the central area of ​​the second central hollow circular space of the lower heave tank.

[0013] According to some embodiments of the present application, the floating foundation of the offshore floating wind turbine further includes a breeding box and a lifting device, and the lifting device enables the breeding box to be lifted and moved between the upper heave tank and the third buoyancy box.

[0014] According to the floating foundation of the offshore floating wind turbine in some embodiments of the present application, a ballast tank is arranged in the inner space of at least the lowest area of ​​the arc-shaped part of the third pontoon, and a storage tank is arranged in part or all of the inner space of the upper heave tank and / or the lower heave tank and / or the first pontoon and / or the second pontoon.

[0015] According to the floating foundation of the offshore floating wind turbine in some embodiments of the present application, the storage tank includes a storage tank for oil and / or gas.

[0016] According to the floating foundation of the offshore floating wind turbine in some embodiments of the present application, the upper heave tank is a hollow annular tank arranged in a horizontal plane, and the center of the annular shape of the tank is a hollow circular space;

[0017] The first buoyancy box is a hollow box body arranged on a horizontal plane, arranged between opposite bulkheads of the upper heave tank separating the hollow circular space, and communicated with the body of the upper heave tank;

[0018] The lower heave tank is a hollow annular tank arranged in a horizontal plane, and the center of the annular tank is a hollow circular space;

[0019] The second buoyancy box is an internal hollow box body arranged at the upper and lower parts;

[0020] The third buoyancy tank is a semicircular ring-shaped box body with a hollow interior arranged up and down, and the two ends are arranged between opposite bulkheads of the hollow circular space separated by the lower heave tank.

[0021] According to some embodiments of the present application, the offshore floating wind turbine floating foundation further includes a ballast block and a mooring system, wherein the ballast block is connected to the lowest area of ​​the arc-shaped portion of the third pontoon;

[0022] One end of a plurality of the mooring systems is connected to the hull of the lower heave tank at intervals, and the other end is connected to the seabed.

[0023] According to some embodiments of the present application, the floating foundation of the offshore floating wind turbine also includes a horizontal pontoon, which includes a first horizontal pontoon and a second horizontal pontoon. The first horizontal pontoon and the second horizontal pontoon are vertically intersected and connected, and intersect at the center area of ​​the circular ring of the hull of the upper heave tank.

[0024] According to the floating foundation of an offshore floating wind turbine in some embodiments of the present application, the lifting device includes a drive motor, a winding device, a fixed pulley, a movable pulley and a rope, wherein:

[0025] The drive motor is connected to the winder to drive the rotating wheel of the winder to rotate, and the rope is wound around the rotating wheel of the winder. The drive motor, the winder and the fixed pulley are arranged in an equipment compartment arranged in the inner space of the first pontoon, and a reinforcing rib is arranged on the inner wall of the inner space of the first pontoon;

[0026] The first buoyancy box is provided with an opening through which the rope passes, and the movable pulley is provided in the breeding box;

[0027] The first end of the rope is connected to the outer side of the lower wall of the first buoyancy box, is wound around the movable pulley, is then wound around the fixed pulley, and is then wound around the rotating wheel of the winder.

[0028] According to the floating foundation of the offshore floating wind turbine in some embodiments of the present application, the lifting device includes four groups, the fixed pulleys of the four lifting devices are respectively arranged at the ends of the first horizontal pontoon and the second horizontal pontoon, and the movable pulleys of the four lifting devices are respectively arranged at the four top corners of the breeding box.

[0029] In a second aspect, an offshore wind turbine platform according to some embodiments of the present application comprises any one of the floating foundations of an offshore floating wind turbine and an offshore wind turbine, wherein the offshore wind turbine is supported by a tower, and the tower is installed on the first pontoon.

[0030] Compared with the prior art, the beneficial effects of the utility model are:

[0031] On the first aspect, the relative arrangement of the two heave tanks of the utility model can improve the movement performance of the wind turbine platform, and the lowest area of ​​the arc-shaped part of the third pontoon is arranged below the second central hollow circular space of the lower heave tank, and corresponds to the central area of ​​the second central hollow circular space of the lower heave tank, thereby utilizing the tumbler principle to further improve the movement performance of the wind turbine platform.

[0032] On the second aspect, the utility model combines offshore wind power generation with marine fish farming and oil and gas resource storage, which can not only provide a steady supply of electricity resources for deep-sea operations, but also store the oil and gas resources mined in the deep sea on the platform, greatly alleviating the pressure of transportation. By setting aquaculture cages on the floating platform, the huge hemispherical space inside can be fully utilized to bring greater benefits.

[0033] On the third side, the utility model is provided with two layers of heave plates, and concrete ballast blocks are provided inside and outside at the same time, and the heave plates are connected to the seabed through four anchor chains, so as to further improve the movement performance of the platform.

[0034] In the fourth aspect, an anchor chain hole is set at the bottom of the hemispherical pontoon. One end of the anchor chain is connected to the anchor chain hole, and the other end is connected to the concrete ballast block. The use of external ballast blocks can not only improve the overall movement performance of the platform, but also save space in the internal cabin of the platform structure, and can store more oil and gas resources. The ballast blocks are made of concrete, which has the advantages of low cost, corrosion resistance, and high quality.

[0035] In the fifth aspect, the aquaculture cage is set within the hemispherical floating foundation surrounded by the lower heave tank, the upper heave tank, the hemispherical buoyancy tank and the horizontal buoyancy tank, which can adjust the height of the aquaculture cage in the water according to the water level, and can also facilitate the salvage of seafood. It is also beneficial to the stability of the aquaculture cage and reduce the impact of huge waves on aquaculture.

[0036] In the sixth aspect, the utility model takes the improvement of platform motion performance as the basis, combines it with the overall framework of oil and gas development and storage and offshore aquaculture industry, and can improve the resource utilization rate of offshore wind power. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] After reading the detailed description of the utility model in conjunction with the accompanying drawings and implementation modes, the advantages and other practical aspects of the utility model will become more clear.

[0038] Figure 1 The figure is a schematic diagram of a floating foundation structure of an offshore floating wind turbine.

[0039] Figure 2 This is a cross-sectional view of a floating foundation of an offshore floating wind turbine.

[0040] Figure 3 Schematic diagram of the lifting device.

[0041] 1- bottom heave tank; 2- upper heave tank; 3- hemispherical pontoon; 4- steel cable; 5- concrete ballast block; 6- horizontal pontoon; 7- breeding cage; 8- mooring system; 9- tower; 10- fan blade; 11- fan cabin; 12- ballast tank; 13- oil and gas storage tank; 14- equipment cabin; 15- pulley system, 16- fixed pulley, 17- movable pulley, 18- rope, 19- winder, 20- driving motor. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The specific embodiments described here are only used to explain the present invention and to limit the present invention.

[0043] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] like Figure 1-2 As shown, an offshore wind turbine platform includes a floating foundation of an offshore floating wind turbine and an offshore wind turbine, wherein the offshore wind turbine is supported by a tower 9, wherein the floating foundation of the offshore floating wind turbine includes a lower heave tank, an upper heave tank 2, a horizontal pontoon 6 (a first pontoon), a heave tank supporting pontoon (a second pontoon) and a hemispherical pontoon 3 (a third pontoon).

[0045] The upper and lower swing tanks are in the shape of a ring, that is, a hollow ring-shaped tank body arranged in a horizontal plane. The center of the ring-shaped tank body is the central circle center space. The upper swing tank 2 is the first central circle center space, and the lower swing tank is the second central circle center space. That is, the tank body is a ring-shaped structure composed of two concentric circles, and the interior of the tank body is hollow. The center of the ring-shaped tank surrounded by the tank body is hollow and circular, which is called the central circle center space. Among them, the upper swing tank 2 and the lower swing tank are arranged opposite to each other up and down and have a certain distance. The two swing tanks are provided with ballast tanks 12 and oil and gas storage tanks inside.

[0046] Among them, the outer surface of the lower heave tank is provided with anchor chain holes in four directions, one end of the mooring system 8 is connected at the anchor chain hole, and the other end is fixed on the seabed.

[0047] The cross-shaped horizontal pontoon 6 (first pontoon) is arranged in the central circular space of the upper heave tank 2. The horizontal pontoon 6 is a hollow box arranged in a horizontal plane. It is arranged between opposite bulkheads of the hollow circular space of the upper heave tank 2, and the horizontal pontoon 6 is connected to the hull of the upper heave tank 2. The horizontal pontoon 6 includes a first horizontal pontoon 6 and a second horizontal pontoon 6. The first and second horizontal pontoons 6 intersect vertically and are connected at the intersection. The center position of the horizontal pontoon 6, i.e., the intersection position of the first horizontal pontoon 6 and the second horizontal pontoon 6, is connected to the wind turbine tower 9, and is used to support the tower 9 located at the center position of the horizontal pontoon 6.

[0048] The heave tank support pontoons are spaced apart along the circumferential direction and connect the two heave tanks up and down. The spacing distribution makes the internal space formed by the lower heave tank and the upper heave tank 2 not closed and allows seawater to pass through, which is beneficial to the stability of the aquaculture box and reduces the impact of huge wind and waves on aquaculture.

[0049] The hemispherical buoyancy tank includes more than one semi-circular buoyancy tank, which is a hollow semi-circular ring box inside a box body arranged up and down, including two ends and an arc-shaped part. The center of the semi-circular ring formed by the box body is a hollow semi-circular space, that is, the box body is a semi-circular ring structure composed of two concentric semicircles, and the box body is hollow inside. The center of the semi-circular ring surrounded by the box body is hollow and semi-circular. The semi-circular ring buoyancy tank has two ends arranged between opposite bulkheads of the hollow circular space of the lower swing tank, and is connected with the cabin body of the lower swing tank. The lowest area of ​​the arc-shaped part is arranged below the hollow circular space of the cabin body of the lower swing tank, and corresponds to the central area of ​​the central circular space of the lower swing tank. In this way, the ballast can be more concentrated at the center position of the swing tank, which is beneficial to the improvement of the platform movement performance.

[0050] In one scheme, the hemispherical pontoon is composed of two semi-circular pontoons that cross and connect at the lowest area of ​​the arc part, and the two ends of the semi-circular pontoons are vertically connected and connected to the lower swing tank. Ballast tanks 12 and oil and gas storage tanks are arranged inside the hemispherical pontoon. The ballast tank 12 is at least arranged in the internal space of the lowest area of ​​the arc of the semi-circular pontoon, so that the lower part of the swing tank has a tumbler effect, which is beneficial to the improvement of the platform's motion performance. The internal space of the hemispherical pontoon formed by the intersection of the semi-circular pontoons is not closed and allows seawater to pass through. Ballast tanks 12, oil storage tanks and gas storage tanks are arranged inside the hemispherical pontoon 3. An anchor chain hole is set at the bottom of the hemispherical pontoon 3, one end of the anchor chain is connected to the anchor chain hole, and the other end is connected to the concrete ballast block 5. The use of external ballast blocks can not only improve the overall motion performance of the platform, but also save space in the internal cabin of the platform structure, and can store more oil and gas resources. The ballast block is made of concrete, which has the advantages of low cost, corrosion resistance, and high quality.

[0051] The cross-shaped horizontal pontoon 6 is connected to the inner and outer surfaces of the circular ring of the upper swing tank 2 in four directions. An equipment cabin 14, such as a system control cabin, is provided inside the horizontal pontoon 6. The equipment cabin 14 is provided inside the horizontal pontoon 6, which can control the transportation and storage of oil and gas resources, and can also control the up and down movement of the aquaculture cage 7 through its bottom zipline system. For example, it is used to accommodate equipment such as the driving motor 20, fixed pulley 16 and winder 19 of the lifting device, as well as other equipment or control systems. The lifting device can be controlled to make the aquaculture cage 7 move up and down, so that it can move up and down in the internal space formed by the upper swing tank 2, the lower swing tank and the assembly of each pontoon. That is, the aquaculture cage 7 is set within the range of the hemispherical floating foundation surrounded by the lower swing tank, the upper swing tank 2, the hemispherical pontoon and the horizontal pontoon 6. The height of the aquaculture cage in the water can be adjusted according to the water level, and it can also facilitate the salvage of marine products. Among them, Figure 3 As shown, the lifting device includes a driving motor 20, a winding device 19, a fixed pulley 16, a movable pulley 17 and a rope 18, wherein: the driving motor 20 is connected to the winding device 19 to drive the rotating wheel of the winding device 19 to rotate, and the rope 18 is wound around the rotating wheel of the winding device 19. The driving motor 20, the winding device 19 and the fixed pulley 16 are arranged in the equipment cabin 14 arranged in the internal space of the first pontoon, and a reinforcing rib is arranged on the inner wall of the internal space of the first pontoon; the first pontoon is provided with an opening through which the rope 18 passes, and the movable pulley 17 is arranged in the breeding box; the first end of the rope 18 is connected to the outer side of the lower wall of the first pontoon, and is wound around the movable pulley 17, then around the fixed pulley 16, and then around the rotating wheel of the winding device 19. The lifting device includes four groups, and the fixed pulleys 16 of the four lifting devices are respectively arranged at the ends of the first horizontal pontoon 6 and the second horizontal pontoon 6, and the movable pulleys 17 of the four lifting devices are respectively arranged at the four top corners of the breeding box.

[0052] In one example, the bottom swing tank 1, the upper swing tank 2, the horizontal pontoon 6 and the hemispherical pontoon 3 are all made of steel, and are all sealed and welded with steel plates. Reinforcement ribs are set on the inner wall to ensure the strength of the floating platform. At the same time, the setting of the two-layer swing tank can improve the movement performance of the wind turbine platform. The bottom swing tank 1, the upper swing tank 2 and the hemispherical pontoon 3 have sufficient internal space, and ballast tanks 12 and oil and gas storage tanks can be set. The ballast tank 12 is filled with concrete. The oil and gas storage tanks can store oil and gas with a large unit mass and make full use of the space. Of course, other pontoons can also store oil and gas. It can be understood that in this embodiment, multiple ballast tanks 12 can be set in an integrated or split form, and the oil and gas storage tanks are used to be set in the above-mentioned swing tanks and pontoons. The split storage tanks can form an internal isolation space for easy access and measurement.

[0053] It should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A floating foundation for an offshore floating wind turbine, characterized in that: include The upper heave tank has a first central hollow circular space formed in the middle of the tank; A first buoyancy tank is arranged in the upper heave tank and supports the offshore floating wind turbine; The lower heave tank has a second central hollow circular space formed in the middle of the tank body, and the upper heave tank and the lower heave tank are arranged opposite to each other up and down; A second buoyancy tank is disposed between the upper heave tank and the lower heave tank, and is communicated with the upper heave tank and the lower heave tank; The third buoyancy tank includes an arc-shaped portion and two end portions, wherein the two end portions are arranged in different areas with intervals on the lower swing tank and are connected to the body of the lower swing tank, and the lowest area of ​​the arc-shaped portion is arranged below the second central hollow circular space of the lower swing tank and corresponds to the central area of ​​the second central hollow circular space of the lower swing tank.

2. The floating foundation of an offshore floating wind turbine according to claim 1, characterized in that: The two ends of different third pontoons are spaced apart in different areas with intervals on the lower swing tank, the lowest areas of the arc-shaped parts of different third pontoons intersect and are connected, and are arranged below the second central hollow circular space of the lower swing tank, and correspond to the central area of ​​the second central hollow circular space of the lower swing tank.

3. The floating foundation of an offshore floating wind turbine according to claim 1, characterized in that: It also includes a breeding box and a lifting device, and the lifting device enables the breeding box to be lifted and moved between the upper heave tank and the third buoyancy tank.

4. The floating foundation of an offshore floating wind turbine according to claim 1, characterized in that: in, A ballast tank is arranged in the inner space of at least the lowest area of ​​the arc-shaped part of the third pontoon, and a storage tank is arranged in part or all of the inner space of the upper heave tank and / or the lower heave tank and / or the first pontoon and / or the second pontoon, wherein the storage tank includes a storage tank for oil and / or gas.

5. The floating foundation of an offshore floating wind turbine according to claim 3, characterized in that: The upper heave tank is a hollow annular tank arranged in a horizontal plane, and the center of the annular tank is a hollow circular space; The first buoyancy box is a hollow box body arranged on a horizontal plane, arranged between opposite bulkheads of the upper heave tank separating the hollow circular space, and communicated with the body of the upper heave tank; The lower heave tank is a hollow annular tank arranged in a horizontal plane, and the center of the annular tank is a hollow circular space; The second buoyancy box is an internal hollow box body arranged at the upper and lower parts; The third buoyancy tank is a semicircular ring-shaped box body with a hollow interior arranged up and down, and the two ends are arranged between opposite bulkheads of the hollow circular space separated by the lower heave tank.

6. The floating foundation of an offshore floating wind turbine according to claim 1, characterized in that: Also included are ballast blocks and a mooring system, wherein the ballast blocks are connected to the lowest region of the arc-shaped portion of the third pontoon; One end of a plurality of the mooring systems is connected to the hull of the lower heave tank at intervals, and the other end is connected to the seabed.

7. The floating foundation of an offshore floating wind turbine according to claim 5, characterized in that: It also includes a horizontal pontoon, which includes a first horizontal pontoon and a second horizontal pontoon. The first horizontal pontoon and the second horizontal pontoon are vertically intersected and connected, and intersect at the center area of ​​the circular ring of the hull of the upper heave tank.

8. The floating foundation of an offshore floating wind turbine according to claim 7, characterized in that: The lifting device comprises a driving motor, a winding device, a fixed pulley, a movable pulley and a rope, wherein: The drive motor is connected to the winder to drive the rotating wheel of the winder to rotate, and the rope is wound around the rotating wheel of the winder. The drive motor, the winder and the fixed pulley are arranged in an equipment compartment arranged in the inner space of the first pontoon, and a reinforcing rib is arranged on the inner wall of the inner space of the first pontoon; The first buoyancy box is provided with an opening through which the rope passes, and the movable pulley is provided in the breeding box; The first end of the rope is connected to the outer side of the lower wall of the first buoyancy box, is wound around the movable pulley, is then wound around the fixed pulley, and is then wound around the rotating wheel of the winder.

9. The floating foundation of an offshore floating wind turbine according to claim 8, characterized in that: The lifting device comprises four groups, the fixed pulleys of the four lifting devices are respectively arranged at the ends of the first horizontal floating box and the second horizontal floating box, and the movable pulleys of the four lifting devices are respectively arranged at the four top corners of the breeding box.

10. An offshore wind turbine platform, characterized in that: It comprises the floating foundation of an offshore floating wind turbine as described in any one of claims 1 to 9 and an offshore wind turbine, wherein the offshore wind turbine is supported by a tower, and the tower is installed on the first pontoon.

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