Device and arrangement for the horizontal preassembly of a wind turbine rotor

1. An arrangement comprising an adapter device that comprises a connection piece on an underside of the adapter device for fastening the adapter device to a tower system of a tower crane, a rotor flange on a top side of the adapter device for fastening a rotor hub of a wind turbine rotor to be assembled, a work platform that surrounds the rotor flange, wherein the work platform is located between the connection piece and the rotor flange and is Health, Safety, and Environment (HSE) compliant, and wherein the rotor flange is elevated with respect to the work platform such that a passage from the work platform to an access opening in the region of the connection piece is provided in the adapter device between the rotor flange and the work platform, and a tower system of a tower crane, wherein the adapter device is fastened to the tower system by way of the connection piece,

wherein the adapter device has an extension arm to which a ballast weight for applying a bending moment to the adapter device parallel to the plane of the rotor flange is able to be fastened, and

wherein the extension arm has a displacement device for displacing the ballast weight along the longitudinal axis of the extension arm.

2. The arrangement of claim 1 , wherein stability of the tower system is achieved via ballasting at a foot of the tower system.

3. The arrangement of claim 1 , wherein the tower system is fastened to a foundation of the wind turbine to be erected or is fastened to a separately constructed foundation.

4. The arrangement of claim 1 , wherein the adapter device or the tower system is configured to be supported on an at least partially erected tower of the wind turbine.

5. The arrangement of claim 1 , wherein the tower system is configured such that a minimum clearance height under a wind turbine rotor assembled on the adapter device is at least 4.5 m, or the maximum height of a wind turbine rotor assembled on the adapter device above the ground is 40 m.

6. The arrangement of claim 1 , wherein the extension arm is pivotable parallel to the plane of the rotor flange or is able to be mounted in any one of several defined positions.

7. The arrangement of claim 1 , wherein the adapter device is foldable or telescopic such that, in a collapsed state, the adapter device has external dimensions of at most 2.5 m×2.75 m×10 m.

8. The arrangement of claim 1 , wherein the adapter device is foldable or telescopic such that, in a collapsed state, the adapter device has external dimensions that are selected such that the adapter device is loadable in a 40 foot container.

9. The arrangement of claim 1 , wherein the adapter device is foldable or telescopic such that, in a collapsed state, the adapter device has external dimensions that are selected such that the adapter device is loadable in a 20 foot container.

10. The arrangement of claim 1 , wherein the tower system is configured such that a minimum clearance height under a wind turbine rotor assembled on the adapter device is at least 8 m, or the maximum height of a wind turbine rotor assembled on the adapter device above the ground is 35 m.

11. The arrangement of claim 1 , wherein the tower system is configured such that a minimum clearance height under a wind turbine rotor assembled on the adapter device is at least 9.5 m, or the maximum height of a wind turbine rotor assembled on the adapter device above the ground is 25 m.

12. The arrangement of claim 1 , wherein the connection piece and the rotor flange are arranged substantially coaxially.

13. The arrangement of claim 1 , comprising a staircase from the work platform to the rotor flange.

14. The arrangement of claim 1 , wherein the extension arm is pivotable parallel to the plane of the rotor flange and is able to be mounted in any one of several defined positions.

15. The arrangement of claim 1 , comprising a rotating device fastened to the rotor flange, wherein the rotating device is configured such that the rotor hub of the wind turbine rotor to be assembled is fastenable to the rotating device, and wherein the rotating device allows the rotor hub to rotate in the plane of the rotor flange.

16. The arrangement of claim 1 , wherein the adapter device is foldable and telescopic such that, in a collapsed state, the adapter device has external dimensions of at most 2.5 m×2.75 m×10 m.