Lifting assembly for a wind turbine

1. A lifting assembly ( 1 ) for elevating components ( 3 ) to a wind turbine ( 5 ) comprising:

a plurality of tower segments ( 13 ) which together form an elongated tower ( 9 ),

a support frame ( 11 ) for supporting the tower ( 9 ),

a securing assembly ( 32 ) securing the tower ( 9 ) to the wind turbine ( 5 ), and

a crane ( 21 ), wherein the lifting assembly ( 1 ) comprises:

an upper platform ( 7 ) vertically movable along the tower ( 9 ), and

a lower platform ( 8 ) vertically movable along the tower ( 9 ) between the upper platform ( 7 ) and the support frame ( 11 ), wherein the crane ( 21 ) is disposed on the upper platform ( 7 ) and the lower platform ( 8 ) is provided with a storage area ( 16 ) for supporting the components ( 3 ), and the crane ( 21 ) is adapted to move the components ( 3 ) to and from said storage area ( 16 ) of the lower platform ( 8 ).

2. The lifting assembly ( 1 ) according to claim 1 , wherein each of the upper and lower platforms ( 7 , 8 ) is provided with an opening ( 17 , 18 ) for receiving the tower ( 9 ), and the openings ( 17 , 18 ) are aligned in a vertical direction.

3. The lifting assembly ( 1 ) according to claim 1 , wherein the upper platform ( 7 ) comprises a second opening ( 52 ) aligned with the storage area ( 16 ) to allow the components ( 3 ) to be moved from the storage area ( 16 ) through the second opening ( 52 ) to the upper platform ( 7 ).

4. The lifting assembly ( 1 ) according to claim 1 , wherein the lower platform ( 8 ) comprises a base frame ( 53 ) and a support member ( 65 ) having an upper surface defining said storage area ( 16 ), and the support member ( 65 ) is arranged to be movable in a vertical direction relative to the base frame ( 53 ).

5. The lifting assembly ( 1 ) according to claim 4 , wherein the upper platform ( 7 ) comprises a transportation unit ( 68 ) adapted to move a tower segment ( 13 ) between the second opening ( 52 ) and the first opening ( 17 ).

6. The lifting assembly ( 1 ) according to claim 1 , wherein the upper platform ( 7 ) comprises an upper platform drive unit ( 25 ) for the vertical movement of the upper platform ( 7 ) and an upper platform power supply unit ( 36 ) adapted to provide the upper platform drive unit ( 25 ) with power, and the lower platform ( 8 ) comprises a lower platform drive unit ( 29 ) for the vertical movement of the lower platform ( 8 ) and a lower platform power supply unit ( 39 ) adapted to provide the lower platform drive unit ( 29 ) with power.

7. The lifting assembly ( 1 ) according to claim 6 , wherein the tower segments ( 13 ) comprise gear racks ( 28 ), the upper platform ( 7 ) comprises at least one upper platform gear wheel ( 26 ) turned by the upper platform drive unit ( 25 ) and adapted to engage with the gear racks ( 28 ) on the tower segments ( 13 ), and the lower platform ( 8 ) comprises at least one lower platform gear wheel ( 30 ) turned by the lower platform drive unit ( 29 ) and adapted to engage with the gear racks ( 28 ) on the tower segments ( 13 ).

8. The lifting assembly ( 1 ) according to claim 6 , wherein

each of the upper and lower platforms ( 7 , 8 ) is provided with an opening ( 17 , 18 ) for receiving the tower ( 9 ), and the openings ( 17 , 18 ) are aligned in a vertical direction, and

the lower platform power supply unit ( 39 ) and the storage area ( 16 ) are arranged on opposite sides of the first opening ( 18 ) of the lower platform ( 8 ).

9. The lifting assembly ( 1 ) according to claim 8 , wherein the tower segments ( 13 ) comprise gear racks ( 28 ), the upper platform ( 7 ) comprises at least one upper platform gear wheel ( 26 ) turned by the upper platform drive unit ( 25 ) and adapted to engage with the gear racks ( 28 ) on the tower segments ( 13 ), and the lower platform ( 8 ) comprises at least one lower platform gear wheel ( 30 ) turned by the lower platform drive unit ( 29 ) and adapted to engage with the gear racks ( 28 ) on the tower segments ( 13 ).

10. The lifting assembly ( 1 ) according to claim 1 , wherein the securing assembly ( 32 ) is attached to the upper platform ( 7 ).

11. The lifting assembly according to claim 1 , wherein the securing assembly ( 32 ) comprises two arms ( 33 ) movable relative to each other and the arms ( 33 ) are bent towards each other to allow them to clamp around the wind turbine ( 5 ).

12. The lifting assembly ( 1 ) according to claim 11 , wherein said arms ( 33 ) are pivotally attached to the upper platform ( 7 ).

13. The lifting assembly ( 1 ) according to claim 1 , wherein the storage area ( 16 ) is arranged on an upper part of the lower platform ( 8 ) and a space ( 27 ) for transportation of a passenger is defined below the storage area ( 16 ).

14. The lifting assembly ( 1 ) according to claim 1 , wherein the support frame ( 11 ) comprises a transfer unit ( 58 ) adapted to move the tower ( 9 ) in a horizontal direction relative to the support frame ( 11 ).

15. The lifting assembly ( 1 ) according to claim 1 , wherein the storage area ( 16 ) is designed for supporting the components ( 3 ) weighing more than 10 tons.

16. The lifting assembly ( 1 ) according to claim 15 , wherein the storage area ( 16 ) is designed for supporting the components ( 3 ) weighing more than 20 tons.

17. The lifting assembly ( 1 ) according to claim 16 , wherein the storage area ( 16 ) is designed for supporting the components ( 3 ) weighing more than 30 tons.