An offshore wind turbine component replacement device and method

Abstract

The present invention provides an offshore wind turbine component replacement device and method. The offshore wind turbine component replacement device includes a boom having a first end and a second end. An articulated mechanism is provided at the first end, and the articulated mechanism is fixedly connected to the wind turbine, allowing the boom to rotate relative to the wind turbine. A lifting bracket is provided at the second end, and a lifting tool for lifting heavy objects is provided on the lifting bracket. A driving mechanism is used to drive the rotation of the boom, including a power unit, a towing rope, and a tower upper support. The power unit is fixedly arranged on the tower lower structure of the wind turbine, the tower upper support is arranged in the nacelle of the wind turbine, and the towing rope connects the power unit, the tower upper support, and the second end. The power unit tightens or releases the towing rope to drive the rotation of the boom and adjust the pitching angle of the boom. When lifting a heavy object, the lifting tool lifts the heavy object, the power unit tightens the towing rope, drives the boom to rotate towards the direction close to the wind turbine until the lifting bracket reaches above the nacelle, and then the lifting tool lowers the heavy object into the nacelle.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation, and particularly relates to an offshore wind turbine component replacement device and method. Background Art

[0002] With the increasing installation capacity of wind turbines and the growing service life of wind turbines year by year, components of wind turbine generators need to be replaced. Since the components are very heavy and the height of the tower barrel is relatively high, a leg boat is required for replacing components of offshore wind turbines. However, using a leg boat incurs high lifting costs and is vulnerable to the influence of wind and waves. Therefore, it is necessary to provide an offshore wind turbine component replacement device and method. Summary of the Invention

[0003] The present invention provides an offshore wind turbine component replacement device and method to achieve the hoisting and replacement of wind turbine components.

[0004] To achieve the above object, the present invention provides the following technical solutions.

[0005] An offshore wind turbine component replacement device includes:

[0006] A boom having a first end and a second end. An articulated mechanism is provided at the first end, and the articulated mechanism is fixedly connected to the wind turbine, allowing the boom to rotate relative to the wind turbine; a lifting support is provided at the second end, and a lifting tool for lifting heavy objects is provided on the lifting support;

[0007] A driving mechanism for driving the rotation of the boom, including a power unit, a towing rope, and a tower upper support. The power unit is fixedly provided on the lower structure of the tower of the wind turbine, the tower upper support is provided in the nacelle of the wind turbine, and the towing rope connects the power unit, the tower upper support, and the second end; the power unit tightens or releases the towing rope to drive the rotation of the boom and adjust the pitching angle of the boom.

[0008] The lifting tool includes a mounting assembly, a hook assembly, a steel wire rope, and a winch. The winch tightens or releases the steel wire rope to lift or lower heavy objects;

[0009] When lifting a heavy object, the lifting tool lifts the heavy object, the power unit tightens the towing rope, drives the boom to rotate towards the direction close to the wind turbine until the lifting support reaches above the nacelle, and the lifting tool lowers the heavy object into the nacelle.

[0010] Preferably, there are two sets of the driving mechanisms, which are respectively connected to both sides of the second end. The driving mechanism further includes a first pulley set and a second pulley set. The first pulley set is arranged on the upper tower support, and the second pulley set is arranged on one side of the second end. One end of the towing rope is connected to the power unit, and the other end bypasses the first pulley set and is connected to the second pulley set.

[0011] Preferably, the installation assembly is installed on the lifting support. The steel wire rope is connected to the hook assembly, the installation assembly and the winch, and the hook assembly is connected to the heavy object.

[0012] Preferably, the installation assembly includes an installation frame and an upper pulley set arranged in the installation frame. The installation assembly can move and rotate on the lifting support; the hook assembly includes a lower pulley set and a hook; one end of the steel wire rope is connected to the winch, and the other end bypasses the upper pulley set and is connected to the lower pulley set, and the hook is connected to the heavy object.

[0013] Preferably, the second end is provided with a through hole corresponding to the lifting support, which allows the heavy object to pass through when the lifting tool lifts or lowers the heavy object.

[0014] Preferably, the rotation angle of the boom relative to the horizontal plane satisfies the following formula:

[0015]

[0016] Wherein, is the rotation angle of the boom relative to the horizontal plane; is the weight of the heavy object; is the weight of the boom; is the distance from the suspension point of the heavy object to the hinge point between the boom and the wind turbine; is the distance from the center of gravity of the boom to the hinge point between the boom and the wind turbine; is the angle between the line connecting the center of gravity of the boom and the hinge point between the boom and the wind turbine and the line connecting the suspension point of the heavy object and the hinge point between the boom and the wind turbine.

[0017] Preferably, the hinge mechanism is fixed on the lower tower structure of the wind turbine through a fixing block.

[0018] Preferably, the power unit is a winch or a windlass.

[0019] Based on the same concept, the present invention also provides an operation method of the above-mentioned offshore wind turbine component replacement device, which is characterized by including the following steps:

[0020] Drive the power unit to tighten or release the towing rope to drive the boom to rotate, adjust the angle of the boom, so that the through hole of the boom is located above the ship loading the heavy object;

[0021] Adjust the position of the vessel loaded with heavy objects so that the heavy objects are directly below the through-hole;

[0022] Drive the winch to release the wire rope, lower the hook to the heavy object and connect the heavy object;

[0023] Drive the winch to tighten the wire rope, drive the heavy object to be lifted through the through-hole and rise above the boom;

[0024] Drive the power unit to tighten the towing rope to drive the boom to rotate, so that the lifting bracket is above the engine room, and release the wire rope to lower the heavy object to the engine room.

[0025] Preferably, the mounting assembly can move on the lifting bracket; before releasing the wire rope to lower the heavy object to the engine room, the following steps are further included:

[0026] Drive the power unit to tighten or release the towing rope to adjust the angle of the boom and adjust the lateral position of the heavy object falling into the engine room;

[0027] Move the mounting assembly and adjust the position of the mounting assembly on the lifting bracket, thereby adjusting the longitudinal position of the heavy object falling into the engine room.

[0028] Compared with the prior art, the technical solution of the embodiment of the present invention has beneficial effects.

[0029] For example, the offshore wind turbine component replacement device of the present invention includes: a boom having a first end and a second end, the first end is provided with a hinge mechanism, the hinge mechanism is fixedly connected to the wind turbine, allowing the boom to rotate relative to the wind turbine; the second end is provided with a lifting bracket, and the lifting bracket is provided with a lifting tool for lifting heavy objects; a driving mechanism for driving the boom to rotate, including a power unit, a towing rope and a tower upper support, the power unit is fixedly arranged on the tower lower structure of the wind turbine, the tower upper support is arranged on the engine room of the wind turbine, and the towing rope connects the power unit, the tower upper support and the second end; the power unit tightens or releases the towing rope to drive the boom to rotate and adjust the pitching angle of the boom; when lifting a heavy object, the lifting tool lifts the heavy object, the power unit tightens the towing rope, drives the boom to rotate towards the direction close to the wind turbine until the lifting bracket reaches above the engine room, and the lifting tool lowers the heavy object to the engine room; it does not rely on a leg boat to realize the hoisting of heavy objects to the engine room; the boom only depends on the wind turbine and is not affected by ships or waves, etc., and the lifting tool is more stable, safe and efficient when lifting components;

[0030] For another example, when the mounting assembly of the present invention is installed on the lifting bracket, it is set to be movable and rotatable, which is convenient for adjusting the lateral position of the heavy object falling into the engine room and is beneficial to the accurate placement of the heavy object;

[0031] For another example, the present invention calculates the maximum angle that the boom can rotate according to the structure of the boom, the weight of the boom and the weight of the heavy object, so as to avoid the boom leaning against or hitting the wind turbine when the boom rotates beyond the maximum angle, causing damage;

[0032] For another example, in the present invention, a through hole is provided at the second end of the boom corresponding to the lifting bracket, allowing the heavy object to pass through when the hoist lifts or lowers the heavy object, facilitating the lifting or lowering of the heavy object. Description of the Drawings

[0033] Figure 1 is a schematic view of the boom of the offshore wind turbine component replacement device in the horizontal position according to an embodiment of the present invention;

[0034] Figure 2 is a side view of the boom of the offshore wind turbine component replacement device in the horizontal position according to an embodiment of the present invention;

[0035] Figure 3 is a side view of the boom of the offshore wind turbine component replacement device rotated to the middle position according to an embodiment of the present invention;

[0036] Figure 4 is a side view of the boom of the offshore wind turbine component replacement device rotated to the high position according to an embodiment of the present invention;

[0037] Figure 5 is a schematic view of the hoist lifting a heavy object when the boom is in the horizontal position according to an embodiment of the present invention;

[0038] Figure 6 is a schematic view of the hoist lifting a heavy object when the boom is rotated to the high position according to an embodiment of the present invention;

[0039] Figure 7 is a schematic view of the connection between the first end of the boom and the wind turbine according to an embodiment of the present invention;

[0040] Figure 8 is a schematic view of the hoist lifting a heavy object through the through hole according to an embodiment of the present invention;

[0041] Figure 9 is a schematic view of the force on the boom when the boom is rotated to the high position according to an embodiment of the present invention;

[0042] Figure 10 is a schematic view of the moment balance when the boom is rotated to the high position according to an embodiment of the present invention.

[0043] Description of the Reference Numerals:

[0044] 1. Wind turbine; 11. Structure under the tower; 12. Nacelle;

[0045] 2. Boom; 21. First end; 22. Second end; 221. Through hole; 23. Hinge mechanism; 24. Lifting bracket; 25. Fixed block;

[0046] 3. Driving mechanism; 31. Power unit; 32. Towing rope; 33. Upper tower support; 34. First pulley block; 35. Second pulley block;

[0047] 4. Hoisting device; 41. Installation component; 411. Installation frame; 412. Upper pulley block; 42. Hook component; 421. Lower pulley block; 422. Hook; 43. Steel wire rope; 44. Winch;

[0048] 5. Heavy object. Specific embodiments

[0049] To make the objectives, features and beneficial effects of the present invention more obvious and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It can be understood that the specific embodiments described below are only used to explain the present invention, rather than limiting the present invention. And in the drawings, the same or similar reference numerals may be used to refer to the same or similar elements in different embodiments, and the descriptions of the same or similar elements in different embodiments and the descriptions of the prior art elements, features, effects, etc. may also be omitted.

[0050] Refer to Figures 1 to 10 , an embodiment of the present invention provides an offshore wind turbine component replacement device.

[0051] Specifically, the offshore wind turbine component replacement device includes:

[0052] The boom 2 has a first end 21 and a second end 22. The first end 21 is provided with a hinge mechanism 23, and the hinge mechanism 23 is fixedly connected to the wind turbine 1, allowing the boom 2 to rotate relative to the wind turbine 1; the second end 22 is provided with a lifting support 24, and a hoisting device 4 for hoisting the heavy object 5 is arranged on the lifting support 24;

[0053] The driving mechanism 3 is used to drive the boom 2 to rotate, and includes a power unit 31, a traction rope 32 and a tower upper support 33. The power unit 31 is fixedly arranged on the tower lower structure 11 of the wind turbine 1, the tower upper support 33 is arranged on the nacelle 12 of the wind turbine 1, and the traction rope 32 connects the power unit 31, the tower upper support 33 and the second end 22; the power unit 31 tightens or releases the traction rope 32 to drive the boom 2 to rotate and adjust the pitching angle of the boom 2;

[0054] The hoisting device 4 includes an installation component 41, a hook component 42, a steel wire rope 43 and a winch 44, and the winch 44 tightens or releases the steel wire rope 43 to hoist or lower the heavy object 5;

[0055] When hoisting the heavy object 5, the hoisting device 4 hoists the heavy object 5, the power unit 31 tightens the traction rope 32, drives the boom 2 to rotate towards the direction close to the wind turbine 1 until the lifting support 24 reaches above the nacelle 12, and the hoisting device 4 lowers the heavy object 5 to the nacelle 12; the hoisting of the heavy object 5 to the nacelle 12 is realized without relying on a leg boat; the boom 2 only depends on the wind turbine 1 and is not affected by ships or sea waves, etc., and the hoisting device 4 is more stable, safe and efficient when hoisting components.

[0056] In some embodiments, there are two sets of driving mechanisms 3, which are respectively connected to both sides of the second end 22. The driving mechanism 3 further includes a first pulley set 34 and a second pulley set 35. The first pulley set 34 is arranged on the upper tower support 33, and the second pulley set 35 is arranged on one side of the second end 22. One end of the towing rope 32 is connected to the power unit 31, and the other end bypasses the first pulley set 34 and is connected to the second pulley set 35; the towing rope 32 bypasses the first pulley set 34 and the second pulley set 35 multiple times, reducing the load of the towing rope 32, improving safety, and increasing the service life of the towing rope 32.

[0057] In some embodiments, the installation assembly 41 is installed on the lifting support 24. The steel wire rope 43 is connected to the hook assembly 42, the installation assembly 41, and the winch 44, and the hook assembly 42 is connected to the heavy object 5.

[0058] In some embodiments, the installation assembly 41 includes an installation frame 411 and an upper pulley set 412 arranged in the installation frame 411. The installation assembly 41 can move and rotate on the lifting support 24; the hook assembly 42 includes a lower pulley set 421 and a hook 422; one end of the steel wire rope 43 is connected to the winch 44, and the other end bypasses the upper pulley set 412 and is connected to the lower pulley set 421, and the hook 422 is connected to the heavy object 5.

[0059] Specifically, the winch 44 is arranged at the second end 22, or the winch 44 is arranged on the lower tower structure 11. A guiding pulley is arranged at the second end 22, and the steel wire rope 43 is connected to the winch 44 via the guiding pulley.

[0060] Specifically, the installation assembly 41 can rotate on the lifting support 24. When the boom 2 rotates, under the action of the gravity of the heavy object 5, the installation assembly 41 can be pulled to rotate around the lifting support, so that the hook assembly 42 is always in a vertically downward posture.

[0061] Specifically, the installation assembly 41 can be driven to move on the lifting support 24 by a moving driving structure (not shown). The moving driving structure can adopt a turbine screw drive or a hydraulic cylinder drive, or a similar mechanism that can achieve this function, which is not limited here.

[0062] See Figure 8 , in some embodiments, the second end 22 is provided with a through hole 221 corresponding to the lifting support 24, which allows the heavy object 5 to pass through when the lifting tool 4 lifts or lowers the heavy object 5; when lowering the heavy object, there is no need to first transfer the heavy object 5 to the second end 22, and the heavy object 5 can be directly transferred to the ship below the through hole 221; when lifting the heavy object 5, it can also be directly lifted from the ship below the through hole 221.

[0063] In some embodiments, the rotation angle of the boom 2 relative to the horizontal plane satisfies the following formula:

[0064]

[0065] Among them, is the rotation angle of the boom 2 relative to the horizontal plane; is the weight of the heavy object 5; is the weight of the boom 2; is the distance from the suspension point of the heavy object 5 to the hinge point of the boom 2 and the wind turbine 1; is the distance from the center of gravity of the boom 2 to the hinge point of the boom 2 and the wind turbine 1; is the included angle between the line connecting the center of gravity of the boom 2 and the hinge point of the boom 2 and the wind turbine 1 and the line connecting the suspension point of the heavy object 5 and the hinge point of the boom 2 and the wind turbine 1.

[0066] See Figure 9 and Figure 10 , specifically, when the boom 2 is erected, since the towing rope 32 can only provide tensile force and not thrust force, to ensure that the boom 2 does not fall towards the wind turbine 1 side, the following formula needs to be satisfied when the tensile force of the towing rope 32 is greater than 0:

[0067]

[0068] It is deduced that:

[0069]

[0070] Among them, is the weight of the heavy object 5; is the horizontal distance from the center of gravity of the heavy object 5 to the hinge point of the boom 2 and the wind turbine 1; is the weight of the boom 2; is the horizontal distance from the center of gravity of the boom 2 to the hinge point of the boom 2 and the wind turbine 1; is the tensile force of the towing rope 32, is the vertical distance from the force application point of the towing rope 32 to the hinge point of the boom 2 and the wind turbine 1;

[0071] For the given boom 2 and heavy object 5, the following relationship is satisfied:

[0072]

[0073] It is deduced that:

[0074]

[0075] It is required that , that is, it is necessary to satisfy

[0076] It is deduced that:

[0077]

[0078] Wherein, is the rotation angle of the boom 2 relative to the horizontal plane; is the weight of the heavy object 5; is the weight of the boom 2; is the distance from the suspension point of the heavy object 5 to the hinge point between the boom 2 and the wind turbine 1; is the distance from the center of gravity of the boom 2 to the hinge point between the boom 2 and the wind turbine 1; is the angle between the line connecting the center of gravity of the boom 2 and the hinge point between the boom 2 and the wind turbine 1 and the line connecting the suspension point of the heavy object 5 and the hinge point between the boom 2 and the wind turbine 1.

[0079] In some embodiments, the hinge mechanism 23 is fixed to the lower tower structure 11 of the wind turbine 1 through the fixing block 25.

[0080] In some embodiments, the power unit 31 is a winch or a hoist.

[0081] The present invention also provides an operation method for a marine wind turbine component replacement device, which hoists the heavy object 5 on the ship to the nacelle 12 of the wind turbine 1, and includes the following steps:

[0082] Drive the power unit 31 to tighten or release the towing rope 32 to drive the boom 2 to rotate, adjust the angle of the boom 2, so that the through hole 221 of the boom 2 is located above the ship loading the heavy object;

[0083] Adjust the position of the ship loading the heavy object so that the heavy object 5 is located directly below the through hole 221;

[0084] Drive the winch 44 to release the steel wire rope 43, lower the hook 422 to the heavy object 5 and connect the heavy object 5;

[0085] Drive the winch 44 to tighten the steel wire rope 43, drive the heavy object 5 to be hoisted through the through hole 221 and rise above the boom 2;

[0086] Drive the power unit 31 to tighten the towing rope 32 to drive the boom 2 to rotate, so that the lifting bracket 24 is located above the nacelle 12, and release the steel wire rope 43 to lower the heavy object 5 to the nacelle 12.

[0087] In some embodiments, the installation component 41 can move on the lifting bracket 24; before releasing the steel wire rope 43 to lower the heavy object 5 to the nacelle 12, the following steps are further included:

[0088] Drive the power unit 31 to tighten or release the towing rope 32 to adjust the angle of the boom 2, and adjust the lateral (width direction of the nacelle 12) position where the heavy object 5 falls in the nacelle 12;

[0089] Move the installation component 41, adjust the position of the installation component 41 on the lifting bracket 24, and further adjust the longitudinal (length direction of the nacelle 12) position where the heavy object 5 falls in the nacelle 12.

[0090] Specifically, the method of lifting the components (heavy object 5) to be replaced in the nacelle 12 of the wind turbine 1 onto the ship and the method of lifting the heavy object 5 on the ship to the nacelle 12 of the wind turbine 1 adopt opposite steps, which will not be elaborated here.

[0091] Specifically, in some embodiments, when the boom 2 is in the horizontal position, the hook 422 may not lift the heavy object 5. When the boom 2 rotates towards the wind turbine 1 to a certain angle, the winch 44 is driven to release the wire rope 43, and the hook 422 is lowered to the heavy object 5 to connect the heavy object 5, and then the heavy object 5 is lifted.

[0092] In summary, the offshore wind turbine component replacement device and method provided by the present invention include: a boom 2 having a first end 21 and a second end 22. The first end 21 is provided with a hinge mechanism 23, and the hinge mechanism 23 is fixedly connected to the wind turbine 1, allowing the boom 2 to rotate relative to the wind turbine 1; the second end 22 is provided with a lifting bracket 24, and the lifting bracket 24 is provided with a lifting tool 4 for lifting the heavy object; a driving mechanism 3 for driving the rotation of the boom 2, including a power unit 31, a towing rope 32, and a tower upper support 33. The power unit 31 is fixedly arranged on the tower lower structure 11 of the wind turbine 1, the tower upper support 33 is arranged in the nacelle 12 of the wind turbine 1, and the towing rope 32 connects the power unit 31, the tower upper support 33, and the second end 22; the power unit 31 tightens or releases the towing rope 32 to drive the rotation of the boom 2 and adjust the pitching angle of the boom 2; when lifting the heavy object 5, the lifting tool 4 lifts the heavy object 5, the power unit 31 tightens the towing rope 32, and drives the boom 2 to rotate towards the wind turbine 1 until the lifting bracket 24 reaches above the nacelle 12, and the lifting tool 4 lowers the heavy object 5 to the nacelle 12; it does not rely on a leg ship to realize the lifting of the heavy object 5 to the nacelle 12; the boom 2 only depends on the wind turbine 1 and is not affected by ships or waves, etc., and the lifting tool 4 is more stable, safe, and efficient when lifting components.

[0093] Furthermore, when the installation component 41 of the present invention is installed on the lifting bracket 24, it is set to be movable and rotatable, which is convenient for adjusting the lateral position of the heavy object 5 falling into the nacelle 12 and is beneficial to the accurate placement of the heavy object 5.

[0094] Furthermore, the present invention calculates the maximum angle that the boom 2 can rotate according to the structure of the boom 2, the weight of the boom 2, and the weight of the heavy object 5, so as to avoid the boom 2 leaning against or hitting the wind turbine 1 when the boom 2 rotates beyond the maximum angle, causing damage.

[0095] Furthermore, the present invention sets a through hole 221 corresponding to the lifting bracket 24 at the second end 22 of the boom 2, allowing the heavy object 5 to pass through when the lifting tool 4 lifts or lowers the heavy object 5, which is convenient for the lifting or lowering of the heavy object 5.

[0096] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even in the case where a single embodiment is described only with respect to specific features. The examples of features provided in the present disclosure are intended to be illustrative rather than limiting, unless otherwise stated. In specific implementations, according to actual needs and where technically feasible, the technical features of one or more dependent claims may be combined with the technical features of an independent claim, and may be derived from the technical features of the corresponding independent claim in any appropriate manner rather than only through the specific combinations listed in the claims.

Claims

1. An offshore wind turbine component replacement device, characterized in that, Comprising: A boom having a first end and a second end, the first end being provided with a hinge mechanism fixedly connected to the wind turbine, allowing the boom to rotate relative to the wind turbine; the second end being provided with a lifting bracket on which a hoisting device for lifting heavy objects is arranged; A driving mechanism for driving the boom to rotate, including a power unit, a traction rope and a tower upper support, the power unit being fixedly arranged on the lower tower structure of the wind turbine, the tower upper support being arranged in the nacelle of the wind turbine, the traction rope connecting the power unit, the tower upper support and the second end; the power unit tightens or releases the traction rope to drive the boom to rotate and adjust the pitching angle of the boom; The hoisting device includes a mounting assembly, a hook assembly, a steel wire rope and a winch, the winch tightening or releasing the steel wire rope to hoist or lower heavy objects; When hoisting a heavy object, the hoisting device hoists the heavy object, the power unit tightens the traction rope, driving the boom to rotate towards the direction close to the wind turbine until the lifting bracket reaches above the nacelle, and the hoisting device lowers the heavy object into the nacelle; When operating the offshore wind turbine component replacement device, the following steps are included: Driving the power unit to tighten or release the traction rope to drive the boom to rotate, adjusting the boom angle so that the through hole of the boom is located above the ship loading heavy objects; Adjusting the position of the ship loading heavy objects so that the heavy object is directly below the through hole; Driving the winch to release the steel wire rope, lowering the hook to the position of the heavy object to connect the heavy object; Driving the winch to tighten the steel wire rope, driving the heavy object to be hoisted through the through hole and rise above the boom; Driving the power unit to tighten the traction rope to drive the boom to rotate so that the lifting bracket is located above the nacelle, and releasing the steel wire rope to lower the heavy object into the nacelle.

2. The offshore wind turbine component replacement device according to claim 1, wherein, There are two sets of the driving mechanisms respectively connected to both sides of the second end, the driving mechanism further includes a first pulley group and a second pulley group, the first pulley group is arranged on the tower upper support, the second pulley group is arranged on one side of the second end, one end of the traction rope is connected to the power unit, and the other end bypasses the first pulley group and is connected to the second pulley group.

3. The offshore wind turbine component replacement device according to claim 1, characterized in that, The mounting assembly is installed on the lifting bracket, the steel wire rope connects the hook assembly, the mounting assembly and the winch, and the hook assembly connects the heavy object.

4. The offshore wind turbine component replacement device according to claim 3, characterized in that, The mounting assembly includes a mounting frame and an upper pulley group arranged in the mounting frame, and the mounting assembly can move and rotate on the lifting bracket; the hook assembly includes a lower pulley group and a hook; one end of the steel wire rope is connected to the winch, and the other end bypasses the upper pulley group and is connected to the lower pulley group, and the hook connects the heavy object.

5. The offshore wind turbine component replacement device according to claim 1, wherein The second end is provided with a through hole corresponding to the lifting bracket, allowing the heavy object to pass through when the hoisting device hoists or lowers the heavy object.

6. The offshore wind turbine component replacement device according to claim 1, characterized in that The rotation angle of the boom relative to the horizontal plane satisfies the following formula: Among them, is the rotation angle of the boom relative to the horizontal plane; W is the weight of the heavy object; is the weight of the boom; is the distance from the lifting point of the heavy object to the hinge point between the boom and the fan; is the distance from the center of gravity of the boom to the hinge point between the boom and the fan; is the included angle between the line connecting the center of gravity of the boom and the hinge point of the boom and the wind turbine and the line connecting the hoisting point of the heavy object and the hinge point of the boom and the wind turbine.

7. The offshore wind turbine component replacement device according to claim 1, characterized in that, The hinge mechanism is fixed on the lower tower structure of the wind turbine through a fixing block.

8. The offshore wind turbine component replacement device according to claim 1, wherein, The power unit is a winch or a winch.

9. The offshore wind turbine component replacement device according to claim 1, characterized in that, The mounting assembly can move on the lifting bracket; before releasing the steel wire rope to lower the heavy object into the nacelle, the following steps are further included: The driving power unit tightens or releases the traction rope to adjust the angle of the boom and adjust the lateral position of the heavy object in the nacelle; Move the mounting assembly to adjust the position of the mounting assembly on the lifting bracket, thereby adjusting the longitudinal position of the heavy object in the nacelle.

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