Method for replacing gearbox on wind driven generator tower
The lifting center of gravity and angle of the gearbox are adjusted by hand-pulled hoists, and the gearbox and the wind turbine spindle are separated and replaced by cranes and hydraulic jacks, which solves the problem of the gearbox replacement that requires the tower spindle components and gearbox at the same time in the prior art. Problem, simplification and cost reduction of the replacement process.
Patent Information
- Application Number
- CN202411680540.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-02-11
AI Technical Summary
In the prior art, the replacement of gearboxes of wind power equipment requires the tower spindle components and gearboxes to be simultaneously lowered, resulting in many construction steps, long time and high cost.
The lifting center of gravity and angle of the gearbox are adjusted by hand-pulled hoists, and the crane and hydraulic jacks are used to separate and replace the gearbox and the wind turbine spindle. The gearbox is lifted separately to reduce construction steps and time.
The construction steps are simplified, construction time is shortened, construction costs are reduced, and gearbox replacement is improved in convenience and safety.
Smart Images
Figure CN119409061A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of wind power equipment hoisting, and in particular to a method for replacing a gear box on a wind power generator tower. Background Art
[0002] In the field of wind power, the main shaft components of wind turbine generator sets are connected to the main gearbox through a locking sleeve to achieve transmission. Since the clearance between the locking sleeve planetary frame sleeve and the main shaft is small, with a maximum of only 160μm, assembly in the workshop is a key process that is difficult to operate, and it is even more difficult to replace it on the wind farm tower. Therefore, in the prior art, once the gearbox needs to be replaced in the wind farm, the main shaft components and the gearbox need to be removed from the tower at the same time, resulting in defects such as many construction steps, long construction time, and high construction costs. Summary of the invention
[0003] The technical problem to be solved by the present invention is to provide a method for replacing a gear box on a wind turbine tower.
[0004] The technical solution of the present invention to solve the above technical problem is as follows: A method for replacing a gear box on a wind turbine tower comprises the following steps:
[0005] S1. Remove the nacelle cover of the wind turbine tower by lifting;
[0006] S2. Remove the pipelines connected to the gearbox;
[0007] S3. Place the crane hook just above the center of gravity of the gearbox, with the two front lifting ears of the gearbox as the first lifting point, and the two rear lifting ears of the gearbox as the second lifting point. Install a first shackle and two first lifting straps of equal length on the first lifting point, connect the top of the first lifting strap to a hand chain hoist, connect the top of the hand chain hoist to the crane hook, install a second shackle and two second lifting straps of equal length on the second lifting point, and connect the top of the second lifting strap to the crane hook;
[0008] S4, the crane hook is lifted until the first sling and the second sling are stretched straight and then stops;
[0009] S5. If the crane hook position is offset, adjust the hand chain hoist to adjust the crane hook back to the position just above the center of gravity of the gearbox;
[0010] S6, the crane hook continues to lift the hook. If there is a deviation, repeat step S5. If there is no deviation, apply a lifting force equal to the deadweight value of the gearbox so that there is no additional load between the gearbox and the main shaft of the wind turbine generator.
[0011] S7. Use a hydraulic jack to push the gearbox away from the main shaft of the wind turbine;
[0012] S8, hoisting the gear box down from the wind turbine tower;
[0013] S9, hoisting the new gearbox into the nacelle by adopting steps S3 to S6, and connecting the new gearbox to the main shaft of the wind turbine;
[0014] S10. Reinstall the pipelines connected to the gearbox and reinstall the nacelle cover of the wind turbine tower.
[0015] The beneficial effects of the present invention are as follows: the lifting center of gravity and angle of the gear box are adjusted by a hand winch, so that it is convenient to separate from the main shaft of the wind turbine generator and disassemble; and the gear box can be lifted and removed separately without the need to lift the main shaft of the wind turbine generator, thereby reducing construction steps, shortening construction time, and reducing construction costs.
[0016] Based on the above technical solution, the present invention can also be improved as follows.
[0017] Further, when executing step S7, one end of a chain hoist is connected to both sides of the gear box in the pushing direction, and the other end of the chain hoist is respectively connected to a fixed object in the cabin, and the chain hoist is retracted and extended according to the movement of the gear box.
[0018] The beneficial effect of adopting the above further solution is to prevent the gear box from colliding with other structures and components in the nacelle during the process of separating from the main shaft of the wind turbine.
[0019] Furthermore, when executing step S7, every time the gear box is pushed by 50 mm, check whether the gap between the inner hole of the planetary carrier in the gear box and the main shaft of the wind turbine generator is uniform. If it is not uniform, adjust the hand winch.
[0020] The beneficial effect of adopting the above further solution is to avoid scratching between the inner hole of the planet carrier and the main shaft of the wind turbine generator, thereby preventing damage to the equipment.
[0021] Furthermore, when executing steps S1 to S10, the average wind speed is required to be less than 5 m / s.
[0022] The beneficial effect of adopting the above further solution is to reduce the safety hazards of high-altitude lifting operations.
[0023] Furthermore, four third lifting points distributed in a rectangular shape are arranged on the cabin top cover, and the third lifting points are connected to the crane hook through a third lifting belt.
[0024] The beneficial effect of adopting the above further solution is to ensure that the cabin top cover is hoisted firmly and the force is balanced.
[0025] Furthermore, when the cabin top cover is hoisted and placed on the ground, sleepers are used to support the middle part of the inner side of the cabin top cover.
[0026] The beneficial effect of adopting the above further solution is to prevent the cabin top cover from being deformed when placed.
[0027] Furthermore, the third sling is a 5t*5m sling.
[0028] The beneficial effect of adopting the above further solution is: ensuring the lifting strength.
[0029] Furthermore, the hand chain hoist adopts a 30t hand chain hoist.
[0030] The beneficial effects of adopting the above further solution are: increasing the load-bearing redundancy and reducing safety hazards.
[0031] Furthermore, the first sling is a 30t*4m endless sling.
[0032] The beneficial effect of adopting the above further solution is: high-strength annular sling can prevent the sling from breaking.
[0033] Furthermore, the second sling is a 30t*5m endless sling.
[0034] The beneficial effect of adopting the above further solution is: high-strength annular sling can prevent the sling from breaking. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] Figure 1 It is a working schematic diagram of the present invention.
[0036] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0037] 1. Gearbox; 2. Crane hook; 3. First shackle; 4. First lifting belt; 5. Hand chain hoist; 6. Second shackle; 7. Second lifting belt; 8. Wind turbine main shaft; 9. Hydraulic jack; 10. Chain hoist. DETAILED DESCRIPTION
[0038] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0039] Example 1
[0040] like Figure 1 As shown, a method for replacing a gear box on a wind turbine tower comprises the following steps:
[0041] S1. Remove the nacelle cover of the wind turbine tower by lifting;
[0042] S2, remove the pipelines connected to the gear box 1;
[0043] S3, place the crane hook 2 just above the center of gravity of the gearbox 1, the two front lifting ears of the gearbox 1 are the first lifting point, the two rear lifting ears of the gearbox 1 are the second lifting point, install the first shackle 3 and two first lifting belts 4 of equal length on the first lifting point, the top of the first lifting belt 4 is connected to the hand chain hoist 5, the top of the hand chain hoist 5 is connected to the crane hook 2, install the second shackle 6 and two second lifting belts 7 of equal length on the second lifting point, the top of the second lifting belt 7 is connected to the crane hook 2;
[0044] S4, the crane hook 2 is lifted until the first sling 4 and the second sling 7 are straightened and then stops;
[0045] S5. If the position of the crane hook 2 is offset, adjust the hand chain hoist 5 to adjust the crane hook 2 back to just above the center of gravity of the gear box 1;
[0046] S6, the crane hook 2 continues to lift the hook. If there is a deviation, repeat step S5. If there is no deviation, apply a lifting force to the deadweight value of the gearbox 1 so that there is no additional load between the gearbox 1 and the main shaft 8 of the wind turbine generator.
[0047] S7, using the hydraulic jack 9 to push the gear box 1 away from the main shaft 8 of the wind turbine generator;
[0048] S8, hoisting the gear box 1 down from the wind turbine tower;
[0049] S9, hoisting the new gearbox 1 into the nacelle by adopting steps S3 to S6, and connecting the new gearbox 1 to the main shaft 8 of the wind turbine generator;
[0050] S10, reinstall the pipelines connected to the gear box 1, and reinstall the nacelle top cover of the wind turbine tower.
[0051] The beneficial effects of this embodiment are: the gear box can be separated from the main shaft of the wind turbine by adjusting the lifting center of gravity and angle through the hand winch, and the disassembly is convenient; and the gear box can be lifted and removed separately, and there is no need to lift the main shaft of the wind turbine together, thereby reducing construction steps, shortening construction time, and reducing construction costs.
[0052] In this embodiment, the nacelle top cover is first removed by the crane hook 2, and then the crane hook 2 is moved to the top of the hoisting gear box 1. In the initial state, the gear box 1 and the wind turbine main shaft 8 are connected together, and the gear box 1 is hooked by the first sling 4 and the second sling 7. The wind turbine main shaft 8 does not move, and the hand chain hoist 5 is retracted and extended to adjust the front and rear center of gravity of the gear box 1 until it is balanced and the lifting force is increased to the value of the gear box 1's own weight, so that the gear box 1 is slightly lifted to reduce the load on the wind turbine main shaft 8;
[0053] Then, a hydraulic jack 9 is placed between the main shaft 8 of the wind turbine generator and the gear box 1 , and the hydraulic jack 9 pushes the gear box 1 out along the axial direction of the main shaft 8 of the wind turbine generator.
[0054] Example 2
[0055] like Figure 1 As shown, preferably, on the basis of Example 1, when executing step S7, one end of the chain hoist 10 is connected to both sides of the pushing direction of the gear box 1, and the other ends of the chain hoist 10 are respectively connected to fixed objects in the cabin, and the chain hoist 10 is retracted and extended according to the movement of the gear box 1.
[0056] In this embodiment, the two sides of the gear box 1 are connected to one end of the chain hoist 10, and the other end of the chain hoist 10 is connected to the wind wheel locking plate opposite to the pushing direction to prevent the gear box 1 from colliding with other structures and components in the cabin during the process of separating from the wind turbine main shaft 8.
[0057] In addition, the chain hoist 10 can also be connected to other fixed objects in the cabin, as long as it can play a role in pulling the gearbox 1 in the direction.
[0058] Example 3
[0059] like Figure 1 As shown, preferably, on the basis of Embodiment 1-2, when executing step S7, every time the gear box 1 is pushed 50 mm, check whether the gap between the inner hole of the planetary carrier in the gear box 1 and the main shaft 8 of the wind turbine generator is uniform. If it is not uniform, adjust the hand winch 5.
[0060] In this embodiment, a planetary gear train is arranged inside the gearbox 1, and the planetary gear train includes a sun gear, planetary gears and a planetary carrier, etc. The inner hole of the planetary carrier is dynamically connected to the main shaft 8 of the wind turbine generator. When the gearbox 1 is disengaged, it is necessary to prevent the inner hole of the planetary carrier from scratching the main shaft 8 of the wind turbine generator.
[0061] Example 4
[0062] like Figure 1 As shown, preferably, on the basis of Embodiments 1-3, when executing steps S1 to S10, the average wind speed is required to be less than 5 m / s.
[0063] The beneficial effect of adopting the preferred solution in the above embodiment is: reducing the safety hazards of high-altitude lifting operations.
[0064] Example 5
[0065] like Figure 1 As shown, preferably, on the basis of embodiments 1-4, four third lifting points distributed in a rectangular shape are arranged on the cabin top cover, and the third lifting points are connected to the crane hook 2 through a third lifting belt.
[0066] Preferably, when the cabin top cover is hoisted and placed on the ground, sleepers are used to support the middle part of the inner side of the cabin top cover.
[0067] Preferably, the third sling is a 5t*5m sling.
[0068] In this embodiment, the third sling is a 5-meter-long sling that can bear 5 tons;
[0069] Before lifting, move the crane hook 2 to the top of the cabin roof, and the staff climb out from the skylight of the cabin roof, connect the four third lifting straps to the third lifting points, and then remove all the bolts connecting the cabin roof and the cabin wall;
[0070] The crane slowly lifts the cabin roof cover and places it in the designated position. In order to prevent the cabin roof cover from deforming, sleepers are used to support it in the middle of the inner side.
[0071] Example 6
[0072] like Figure 1 As shown, preferably, on the basis of Embodiments 1-5, the hand chain hoist 5 adopts a 30t hand chain hoist.
[0073] Preferably, the first sling 4 is a 30t*4m annular sling.
[0074] Preferably, the second sling 7 is a 30t*5m endless sling.
[0075] In this embodiment, the first sling 4 is a 4-meter-long sling that can bear a weight of 30 tons, and the second sling 7 is a 5-meter-long sling that can bear a weight of 30 tons. In order to ensure the lifting strength and increase the strength redundancy as much as possible, the annular slings are double-folded for use.
[0076] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.
[0077] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0078] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0079] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0080] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0081] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.
Claims
1. A method for replacing a gear box on a wind turbine tower, characterized in that: The following steps are involved: S1. Remove the nacelle cover of the wind turbine tower by lifting; S2, removing the pipelines connected to the gear box (1); S3, placing the crane hook (2) just above the center of gravity of the gear box (1), with the two front lifting ears of the gear box (1) as the first lifting point, and the two rear lifting ears of the gear box (1) as the second lifting point, installing a first shackle (3) and two first lifting belts (4) of equal length on the first lifting point, the top of the first lifting belt (4) is connected to a hand chain hoist (5), the top of the hand chain hoist (5) is connected to the crane hook (2), installing a second shackle (6) and two second lifting belts (7) of equal length on the second lifting point, and the top of the second lifting belt (7) is connected to the crane hook (2); S4, the crane hook (2) is lifted until the first sling (4) and the second sling (7) are stretched straight and then stops; S5. If the position of the crane hook (2) is offset, adjust the hand chain hoist (5) to adjust the crane hook (2) back to the position just above the center of gravity of the gear box (1); S6, the crane hook (2) continues to lift the hook. If there is a deviation, step S5 is repeated. If there is no deviation, a lifting force is applied to the gear box (1) deadweight value so that there is no additional load between the gear box (1) and the main shaft (8) of the wind turbine generator; S7, using a hydraulic jack (9) to push the gear box (1) away from the main shaft (8) of the wind turbine generator; S8, hoisting the gear box (1) down from the wind turbine tower; S9, using steps S3 to S6 to hoist the new gearbox (1) into the nacelle, and connect the new gearbox (1) to the main shaft (8) of the wind turbine generator; S10, reinstall the pipelines connected to the gear box (1), and reinstall the nacelle top cover of the wind turbine tower.
2. A method for replacing a gear box on a wind turbine tower according to claim 1, characterized in that: When executing step S7, one end of a chain hoist (10) is connected to both sides of the gear box (1) in the pushing direction, and the other end of the chain hoist (10) is respectively connected to a fixed object in the cabin, and the chain hoist (10) is retracted and extended according to the movement of the gear box (1).
3. A method for replacing a gear box on a wind turbine tower according to claim 1, characterized in that: When executing step S7, every time the gear box (1) is pushed 50 mm, check whether the gap between the inner hole of the planetary carrier in the gear box (1) and the main shaft (8) of the wind turbine generator is uniform. If it is not uniform, adjust the hand chain hoist (5).
4. A method for replacing a gear box on a wind turbine tower according to claim 1, characterized in that: When executing steps S1 to S10, the average wind speed is required to be less than 5 m / s.
5. The method for replacing a gear box on a wind turbine tower according to claim 1, characterized in that: The cabin top cover is provided with four third lifting points distributed in a rectangular shape, and the third lifting points are connected to the crane hook (2) via a third lifting belt.
6. A method for replacing a gear box on a wind turbine tower according to claim 5, characterized in that: When the cabin top cover is hoisted and placed on the ground, sleepers are used to support the middle part of the inner side of the cabin top cover.
7. A method for replacing a gear box on a wind turbine tower according to claim 5, characterized in that: The third sling is a 5t*5m sling.
8. The method for replacing a gear box on a wind turbine tower according to claim 1, characterized in that: The hand chain hoist (5) is a 30t hand chain hoist.
9. A method for replacing a gear box on a wind turbine tower according to claim 1, characterized in that: The first sling (4) is a 30t*4m endless sling.
10. A method for replacing a gear box on a wind turbine tower according to claim 1, characterized in that: The second sling (7) is a 30t*5m endless sling.