Wind power plant and rotor blade adjusting drive therefor
The present invention relates to a rotor blade adjusting drive for adjusting the pitch angle of a rotor blade of a wind power plant, comprising a drive train which at the output end can be connected with the rotor blade and/or a bearing member supporting the rotor blade, and a spring accumulator connectable with the drive train, which includes a spring accumulator shaft, a spring accumulator housing and a spring means which can be tensioned by rotating spring accumulator shaft and spring accumulator housing relative to each other, wherein the spring accumulator shaft and/or the spring accumulator housing can be uncoupled from the drive train and is rotatable with respect to the same for biasing the spring accumulator, wherein a braking device is provided for retarding and/or holding the spring accumulator shaft and/or the spring accumulator housing against the spring bias in the uncoupled condition of the spring accumulator.
1. A rotor blade adjusting drive for adjusting the pitch angle of a rotor blade of a wind power plant, comprising
a drive train ( 2 ) which at the output end is connectable with the rotor blade and/or a bearing member supporting the rotor blade, and
a spring accumulator ( 7 ) connectable with the drive train ( 2 ), which includes
a spring accumulator shaft ( 8 ),
a spring accumulator housing ( 9 ), and
a spring means ( 13 ) which can be tensioned by the rotating spring accumulator shaft ( 8 ) and spring accumulator housing ( 9 ) relative to each other, wherein
the spring accumulator shaft ( 8 ) and/or the spring accumulator housing ( 9 ) can be uncoupled from the drive train ( 2 ) and is rotatable with respect to the same for biasing the spring accumulator ( 7 ), and
a braking device ( 26 ) is provided for retarding and/or retaining the spring accumulator shaft ( 8 ) and/or the spring accumulator housing ( 9 ) against the spring bias in the uncoupled condition of the spring accumulator ( 7 ).
2. The rotor blade adjusting drive according to claim 1 , wherein the spring accumulator ( 7 ) is formed to be tensionable when the spring accumulator shaft is engaged, in particular by actuating the spring accumulator housing ( 9 ).
3. The rotor blade adjusting drive according to claim 2 , wherein the spring accumulator housing ( 9 ) is rotatably mounted on a drive train support ( 16 ) by a pivot bearing ( 18 ).
4. The rotor blade adjusting drive according to claim 1 , wherein the spring accumulator housing ( 9 ) is rotatably mounted on a drive train support ( 16 ) by a pivot bearing ( 18 ).
5. The rotor blade adjusting drive according to claim 1 , wherein releasable arresting means ( 23 ) are provided for arresting the spring accumulator housing ( 9 ) in at least one predetermined rotary position with respect to the drive train support ( 16 ).
6. The rotor blade adjusting drive according to claim 5 , wherein the spring accumulator housing ( 9 ) is rotatably mounted on a drive train support ( 16 ) by a pivot bearing ( 18 ), and braking device ( 26 ) is provided between the spring accumulator housing ( 9 ) and the drive train support ( 16 ).
7. The rotor blade adjusting drive according to claim 6 , wherein the spring accumulator housing ( 9 ) is seated on a pivot bearing ring ( 19 ) on the end face and the braking device ( 26 ) is disposed radially inside the pivot bearing ring ( 19 ), in particular engages the pivot bearing ring ( 19 ) and the spring accumulator housing ( 9 ).
8. The rotor blade adjusting drive according to claim 1 , wherein the braking device ( 26 ) provides a braking force which is greater than a biasing force of the spring means ( 13 ) and smaller than a specifiable winding force for winding up the spring accumulator ( 7 ).
9. The rotor blade adjusting drive according to claim 1 , wherein the braking device ( 26 ) constitutes a frictional brake, in particular a spring-biased frictional brake.
10. The rotor blade adjusting drive according to claim 1 , wherein a winding drive ( 21 ) is provided for winding up the spring accumulator ( 7 ).
11. The rotor blade adjusting drive according to claim 10 , wherein the winding drive ( 21 ) includes a drive means for rotatorily driving the spring accumulator housing ( 9 ) with respect to the drive train ( 2 ).
12. The rotor blade adjusting drive according to claim 11 , wherein the drive means constitutes a rotary drive, which is mounted on the drive train support ( 2 ) and includes a drive wheel ( 30 ) engageable with the spring accumulator housing ( 9 ).
13. The rotor blade adjusting drive according to claim 1 , wherein a winding condition monitoring means is provided for monitoring the winding condition of the spring accumulator ( 7 ).
14. The rotor blade adjusting drive according to claim 13 , wherein the winding condition monitoring means includes a rotational angle and/or speed detecting means ( 32 ) for detecting the rotary position of the spring accumulator housing ( 9 ).
15. The rotor blade adjusting drive according to claim 14 , wherein the winding condition monitoring means is formed to be non-resettable.
16. The rotor blade adjusting drive according to claim 1 , wherein the drive train ( 2 ) includes a drive motor ( 1 ) and a transmission ( 3 ) connectable with the drive motor ( 1 ), the spring accumulator ( 7 ) being connectable with a transmission element, in particular a transmission shaft ( 6 ) of the transmission ( 3 ).
17. The rotor blade adjusting drive according to claim 16 , wherein the drive motor ( 1 ) is arranged transverse to a transmission shaft ( 6 ) of the transmission ( 3 ) and the spring accumulator shaft ( 8 ) of the spring accumulator ( 7 ) is arranged parallel, preferably coaxial to the transmission shaft ( 6 ).
18. The rotor blade adjusting drive according to claim 17 , wherein the transmission shaft ( 6 ) includes an output element which can be brought in engagement with the rotor blade and/or the bearing member supporting the rotor blade.
19. The rotor blade adjusting drive according to claim 1 , wherein a disengageable clutch ( 11 ) is provided between the spring accumulator shaft ( 8 ) and the drive train ( 2 ).
20. A wind power plant with a rotor blade adjusting drive according to claim 1 .