Assembly with handling unit for moving a wind turbine component, such as a wind turbine hub, from a transportation position to a wind turbine assembly position in or on the nacelle, the main shaft or the hub

Abstract

The invention relates to a method for moving a wind turbine component, such as a wind turbine hub, from a transportation position to a wind turbine assembly position. The method comprises the steps of: attaching a handling unit to a structural part of the wind turbine component, operatively connecting the handling unit to a wire of a crane system, lifting the wind turbine component with the crane system to an assembly position of the wind turbine, the handling unit and the wind turbine component being suspended from a wire of the crane system, and rotating the wind turbine component with the handling unit during the lifting of the wind turbine component in order to orientate the wind turbine component for assembly. The invention also relates to a handling unit and a wind turbine hub and use hereof.

Claims

1. An assembly for a wind turbine, comprising: a wind turbine hub having a blade bearing; and a handling unit attached to said wind turbine hub at said blade bearing, said handling unit for moving said wind turbine hub from a transportation position to a wind turbine assembly position, said handling unit comprising: at least one connection point located outside said wind turbine hub and configured for connection to a wire of a crane system; at least two attachment points configured for attachment to said wind turbine hub; and an actuator configured for actuating said wind turbine hub around a unit rotational centre in order to perform a rotation of said wind turbine hub from the transportation position to the wind turbine assembly position, said actuator operating to rotate said wind turbine hub while said actuator and said wind turbine hub are suspended with the wire of the crane system, wherein said at least two attachment points are directly attached to said blade bearing without any additional special mounting arrangement being coupled to said blade bearing.

2. The assembly of claim 1, wherein said at least two attachment points are spaced apart from one another so as to be configured for attachment to said wind turbine hub at two spaced apart locations.

3. The assembly of claim 2, wherein said actuator is spaced from said at least two attachment points and is configured to move relative to said at least two attachment points during rotation of said wind turbine hub.

4. The assembly of claim 3, wherein said actuator is configured to remain in a stationary position relative to said at least one connection point during movement relative to said at least two attachment points, thereby actuating rotational movement of said wind turbine hub relative to said at least one connection point.

5. The assembly of claim 1, wherein said at least two attachment points are directly attached to said blade bearing by bolting said handling unit to the blade bearing with bolt fasteners.

6. The assembly of claim 1, wherein the rotation of the wind turbine hub is restricted to a rotation angle of between 80 and 90 degrees.

7. The assembly of claim 1, wherein said actuator is spaced from said at least one connection point such that the wire of the crane system is spaced from said actuator during rotation of the wind turbine component.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will be described in the following with reference to the figures, in which

(2) FIG. 1 illustrates a front view of a large modern wind turbine,

(3) FIG. 2 illustrates schematically the wind turbine as seen from the side and with different wind turbine components,

(4) FIG. 3 illustrates a preferred embodiment of a handling unit according to the invention,

(5) FIGS. 4a and 4b illustrate method steps of attaching the handling unit to a wind turbine component according to the invention,

(6) FIGS. 5a and 5b illustrate schematically the preferred embodiment of the handling unit according to the invention after attachment to a wind turbine component, and

(7) FIGS. 6a to 6d illustrate the different method steps of attaching the handling unit to the wind turbine component and, especially, lifting and rotating the component to an assembly position.

DETAILED DESCRIPTION OF THE DRAWINGS

(8) FIG. 1 illustrates a front view of a modern wind turbine 1 with a tower 2 positioned on a foundation 8. A wind turbine nacelle 3 and hub 4 is positioned on top of the tower.

(9) The wind turbine rotor 6, comprising at least one wind turbine blade, such as three wind turbine blades 5 as illustrated, is connected to the wind turbine hub 4 through pitch mechanisms 7. Each pitch mechanism includes a blade bearing and pitch actuating means, which allows the blade to pitch.

(10) FIG. 2 illustrates schematically the wind turbine seen from the side with different wind turbine components. Wind turbine components connected directly to the nacelle 3 include the wind turbine hub 4, the gearbox 9 and the generator 10 illustrated with an electric connection to a utility grid.

(11) FIG. 3 illustrates a preferred embodiment of a handling unit 11 according to the invention.

(12) The handling unit 11 includes first and second attachment points 12a, 12b for attachment to a structural part 22 of a wind turbine component. The attachment points 12a, 12b may be flanges with a number of holes allowing the unit to be bolted to the component in a fixed and rigid connection.

(13) The first and second attachment points 12a, 12b are established on a fixed arm 13 of the handling unit 11. The fixed arm 13 also comprises a connection to a lever arm 14 connected to the fixed arm 13 in a rotational centre 19 of the handling unit 11.

(14) An actuator 15 is connected to the fixed arm 13 and the lever arm 14 in connection points 17 and 18, i.e. connection point 17 for the actuator 15 to the lever arm 14 and connection point 18 for the actuator 15 to the fixed arm 13. The actuator 15 is preferably a hydraulic cylinder.

(15) The actuator 15 and the arms 13, 14 allow the lever arm 14 to perform a controlled rotational movement around the rotational centre 19 of the unit. The lever arm 14 ends in a connection point 16, such as an eyelet, for a crane system. The crane system allows the handling unit 11 and the wind turbine component to be moved in linear directions, e.g., in a vertical and horizontal direction.

(16) The handling unit 11 is preferably made in steel or a similar metal material with a high strength.

(17) FIGS. 4a and 4b illustrate method steps of attaching the handling unit 11 to a wind turbine component according to the invention. The wind turbine component is illustrated as a wind turbine hub 4. The hub 4 is positioned on a section of a vehicle carrier surface 20, such as the platform of a truck. The transportation configuration includes the hub 4 standing in an upright, vertical, position with the assembly surface facing the carrier surface 20.

(18) FIG. 4a illustrates the handling unit 11 attached to an internal structural part 22 of the hub 4 in a first attachment point 12a. The handling unit attachment to the internal structural part 22 is established through an opening 21b in the hub 4. The structural part 22 may be the hub part of a blade bearing, and the opening may be one of the blade openings in the hub 4.

(19) The handling unit 11 may be suspended in a crane wire 24 during the attachment procedure (not illustrated in FIGS. 4a and 4b).

(20) FIG. 4b illustrates the connection of the handling unit 11 in a second attachment point 12b to the structural part 22 by releasing the actuator 15.

(21) FIGS. 5a and 5b illustrate schematically the preferred embodiment of the handling unit 11 according to the invention after attachment to a wind turbine component. The figures further illustrate a control system 23 controlling the rotational movement of the wind turbine component.

(22) FIG. 5a illustrates an initial position of the lifting and rotation of the wind turbine component. The control system may start the rotational movement after the component is lifted vertically and the necessary distance from a carrier surface 20 is established.

(23) In a preferred embodiment of the invention, the actuator 15 is a hydraulic cylinder connected to a one-way valve and an expansion reservoir of the control system. The opening of the valve allows the hydraulic oil of the actuator 15 to be forced into the expansion reservoir in a controlled manner by the weight of the wind turbine component. This results in a slow piston rod movement into the cylinder 15 and a rotational movement of the wind turbine component until an end stop is reached. The end stop allows the rotational movement to be controlled within a range that ensures that the cylinder 15 is not emptied completely of hydraulic oil. The end stop also ensures that the wind turbine component is rotated a defined angle of, e.g., 70 to 100 degrees and preferably between 80 and 90 degrees before reaching an assembly position.

(24) FIG. 5b illustrates the wind turbine component in a final, horizontal, position before assembly and with the hydraulic cylinder 15 with an almost retracted piston rod.

(25) In another embodiment, the control system may comprise a two-way valve allowing the hydraulic oil to also be forced into the cylinder 15, e.g., with external power such as a hand operated pump.

(26) FIGS. 6a to 6d illustrate the different method steps of attaching the handling unit 11 to the wind turbine component, the latter being illustrated as a wind turbine hub 4. Further, the steps of lifting and rotating the hub to an assembly position at the nacelle are illustrated in the figures.

(27) FIGS. 6a and 6b illustrate the mounting of the handling unit 11 on the hub 4 as explained in detail in the description of FIGS. 4a and 4b. FIG. 6b further illustrates the initial lifting force applied to the wind turbine component (symbolized with the straight line arrow).

(28) FIG. 6c illustrates the rotation of the wind turbine component performing the rotational movement by operating the control system (symbolized with the bend arrow).

(29) FIG. 6d illustrates the final position where the hub is ready for assembly to the front of the nacelle.

(30) The invention described has been exemplified above with reference to specific examples of the handling unit. However, it should be understood that the invention is not limited to the particular examples but may be designed and altered in a multitude of varieties within the scope of the invention as specified in the claims, e.g., by use of electric driven actuators instead of hydraulic actuators. Even further, the invention may also be used to other wind turbine components, which may need rotation from a transportation position to a wind turbine assembly position at the nacelle, such as the wind turbine generator, e.g., a ring generator or gearbox, e.g., in connection with component replacement.

REFERENCE LIST

(31) In the drawings the following reference numbers refer to:

(32) 1. Wind turbine

(33) 2. Wind turbine tower

(34) 3. Wind turbine nacelle

(35) 4. Wind turbine hub

(36) 5. Wind turbine blade

(37) 6. Wind turbine rotor with at least one blade

(38) 7. Blade pitch mechanism

(39) 8. Wind turbine foundation

(40) 9. Wind turbine gearbox

(41) 10. Wind turbine generator

(42) 11. Handling unit

(43) 12a, 12b. First and second attachment points for the handling unit

(44) 13. Fixed arm connected to the attachment points

(45) 14. Lever arm connected to the fixed arm

(46) 15. Actuator, such as a hydraulic actuator

(47) 16. Connection point for a crane system

(48) 17. Connection point for the actuator to the lever arm

(49) 18. Connection point for the actuator to the fixed arm

(50) 19. Rotational centre of the handling unit

(51) 20. Carrier surface of a transport vehicle

(52) 21a, 21b. Hub openings for wind turbine blades

(53) 22. Structural part, e.g., an internal hub structure, such as a part of the blade bearing

(54) 23. Control system for the actuating means, e.g., including a one- or two-way valve and an expansion reservoir

(55) 24. Wire of a crane system