Wind turbine blade lifting device and a method for lifting a wind turbine blade

1. A wind turbine blade lifting device having a length, a width and a height and arranged for arranging and fixating at least a part of a wind turbine blade in said wind turbine blade lifting device for lifting and handling a wind turbine blade or a part of a wind turbine blade that also has a length, a width and a height, where the lifting device comprises:

a chassis having at least one set of connection means for coupling to a lifting apparatus, and means for engaging the wind turbine blade or the part of a wind turbine blade, said chassis comprising a top structure at which four connection means are situated, one at each corner, and a power pack comprising at least one weight element being provided on said chassis, and

wherein said lifting device further comprises:

means for adjusting the point of gravity of at least the lifting device by adjusting at least one of the following parameters:

the position of said at least one weight element in the length direction of the chassis; and

the position of said at least one weight element in the width direction of the chassis.

2. A wind turbine blade lifting device according to claim 1 , wherein the chassis of the lifting device comprises a track arrangement, where the at least one weight element is arranged movable along said track arrangement.

3. A wind turbine blade lifting device according to claim 1 , wherein said chassis further comprises a side structure and a bottom structure, where the chassis comprises an open side opposite said side structure.

4. A wind turbine blade lifting device according to claim 3 , wherein said side structure comprises blade surface support pads.

5. A wind turbine blade lifting device according to claim 3 , wherein said bottom structure comprises blade surface support pads.

6. A wind turbine blade lifting device according to claim 3 , wherein said chassis comprises at least one adjustable locking arm, where said at least one locking arm, at a first end, is arranged at the chassis and, at a second end, comprises means for supporting the wind turbine blade or the part of a wind turbine blade.

7. A wind turbine blade lifting device according to claim 1 , wherein said power pack comprises at least one of: accumulated hydraulic energy, pneumatic energy, and electric energy.

8. A method for installing at least a part of a wind turbine blade or part of a wind turbine blade with the wind turbine blade lifting device of claim 1 , comprising at least the following steps:

arranging at least a part of a wind turbine blade in a wind turbine blade lifting device comprising a chassis which has a top structure at which four connection means are situated, one at each corner, and a power pack comprising at least one weight element and being provided on said chassis,

fixating the at least a part of a wind turbine blade in the wind turbine blade lifting device,

fixating said wind turbine blade lifting device to a lifting apparatus by engaging the lifting device to said four connection means,

adjusting the balance of said at least a part of a wind turbine blade and the wind turbine blade lifting device by adjusting the point of gravity by adjusting one of the following parameters:

the position of at least one weight element, in at least one of the length and width direction of the wind turbine lifting device, and

performing and terminating the installation.

9. A method according to claim 8 , wherein the method further comprises at least the following additional step: adjusting the balance of the at least a part of a wind turbine blade and the wind turbine blade lifting device by remote operation of the adjusting the point of gravity.