Kontravægtsindretning til at udligne og tilpasse en delvis monteret rotor af en vindmølle og en fremgangsmåde deraf

摘要

The invention relates to an arrangement and a method to rotate the hub of a wind turbine. A wind turbine comprises a hub 3 mounted to a nacelle 2 whereby the hub 3 is rotatable around an axis of rotation 10 in respect to the nacelle 2. At least one rotor blade 7a, 7b, 7c is arranged at the hub 3 that leads to a torque around the axis of rotation 10 of the hub 3. A counter weight 6 is attached to the hub 3, whereby the counter weight 6 comprises a mass that leads to a counter-torque around the axis of rotation 10 of the hub 3. The counter-torque interacts with the torque during the installation of at least a second rotor blade 7a, 7b, 7c to the hub. The counter weight 6 is mounted to the hub 3 by a mechanical arrangement that is rotatable in respect to the hub 3 around the axis of rotation 10 of the hub 3. The mechanical arrangement and the counter weight 6 is rotatable in respect to the hub 3 into a certain predetermined position.