A wind turbine blade maintenance platform (8) including a frame having a blade access area (20) structured and arranged to accommodate blade (6) of a wind turbine, a tower end (18), and a front end (19), and sealing means (21) structured and arranged to contact the blade (6) is described. Such a platform should allow working at the blade (6) even at rainy weather. To this end the sealing means (21) includes a drain path (25), wherein the drain path (25) opens into the blade access area (20).

A blade access system (24) includes a support frame (28) configured to be coupled to a nacelle (14) of a wind turbine (10), the support frame (28) having at least one connecting member (42) configured to be selectively attached to and detached from at least one connecting member (40) included with the nacelle (14). A nacelle (14) includes at least one connecting member (40) configured to be coupled to at least one connecting member (42) of a support frame (28) of a blade access system (24). The at least one support frame connecting member (42) is configured to cooperate with the at least one nacelle connecting member (40) to define an unlocked position which is configured to allow the support frame (28) to attach to and detach from the nacelle (14), and a locked position which is configured to prevent the support frame (28) from detaching from the nacelle (28). A method of connecting the blade access system (24) to the nacelle (14) is also disclosed.

The invention relates to wind turbine blade and tower maintenance devices, which can be used for semi- or fully-automated maintenance, including cleaning, de-icing, and painting of wind turbine blades and tower. The wind turbine blade maintenance arrangement, comprising a main frame; a roller frame; at least one cleaning and/or painting means supporting frame; a linear movement rail, comprising the longitudinally extending base surface, two longitudinally-extending walls, being perpendicular to the base surface; a joint, providing for at least one degree of freedom; at least two rollers mounted on the roller frame and configured to allow secure pushing of the arrangement of the cleaning robot against an edge of the wind turbine blade, and moving the maintenance arrangement along the edge of the blade; the cleaning and/or painting means, mounted on the cleaning and/or painting means supporting frame; the cleaning and/or painting means supporting frame or frames are adjustably connected to the roller frame so as to allow controllable adjustment of the distance between the cleaning and/or painting means, and the surfaces of the wind turbine; wherein the main frame and the roller frame are adjustably connected together via a linear movement rail and a joint; the linear movement rail is designed to allow movement of the roller frame in a substantially horizontal direction in respect to the main frame; the joint is designed to allow controllable rotational movement of the roller frame in respect to the linear movement rail, wherein the rotational axis of the revolute joint is substantially perpendicular to the base surface of the linear movement rail.

In a first example there is provided a method of servicing a wind turbine rotor blade. The blade comprises an outer shell defining an interior cavity, and the rotor blade is part of a rotor connected to a wind turbine. The method comprises arranging the rotor such that the 5 blade is in a first orientation, installing a work platform in the interior cavity of the blade when the blade is in the first orientation, and subsequently arranging the blade in a second orientation. The method further comprises using the work platform, when the blade is in the second orientation, to support a technician performing a service operation on the blade.

A device and method for reducing vibrations in a wind turbine with a rotor in standstill are provided. The device includes a portion configured to protrude beyond a leading edge of a wind turbine blade. The device includes a portion configured to protrude beyond the leading edge of the wind turbine and may be releasably attached around the wind turbine blade substantially along a chordwise direction. The device may be detached from the wind turbine blade before the wind turbine starts to operate.

In a first example there is provided a method of servicing a wind turbine rotor blade. The blade comprises an outer shell defining an interior cavity, and the rotor blade is part of a rotor connected to a wind turbine. The method comprises arranging the rotor such that the 5 blade is in a first orientation, installing a work platform in the interior cavity of the blade when the blade is in the first orientation, and subsequently arranging the blade in a second orientation. The method further comprises using the work platform, when the blade is in the second orientation, to support a technician performing a service operation on the blade.

A method for removing a metal insert from a wind turbine rotor blade part includes providing a wind turbine rotor blade part. The wind turbine rotor blade part includes a fibrous composite material and a metal insert held in the fibrous composite material. The metal insert is configured to fasten the wind turbine rotor blade part to a wind turbine rotor hub or to another wind turbine rotor blade part. A connecting layer is disposed between the metal insert and the fibrous composite material and connects the metal insert to the fibrous composite material in a stable manner. The method further includes weakening the connecting layer such that the connecting layer is connecting the metal insert to the fibrous composite material in a less stable manner, and removing the metal insert from the fibrous composite material.

A system for lowering blades without using a crane, which solves a de alignment and insertion problem resulting from the tilt and coning of the blade along the first/last 200-400 mm and the problem of space inside the hub. The system is characterized in that it moves the vertical load of the blade by 90, converting it into a horizontal load actuated by at least two hydraulic elements and by aligning the center of gravity (CoG) of the blade vertically with the center of a bearing by using cables and pulleys. Each of the systems is disposed inside the hub, in the bottom part thereof and secured to the fixed part. The system comprises three main parts: the pulley, the hydraulic element and an axis-shift element secured with pins, one of the pins being fixed and the other adjustable. The cable bordering the end pulley comprises connectors before the point at which same passes through interior pulleys, which distribute the load evenly between the two cables.

The intervention platform comprises: a floating base, immersed in a body of water; at least a wind turbine equipment lifting tower, configured to lift at least an equipment of the wind turbine; The intervention platform has at least a heave plate configured to protrude laterally from the floating base, the heave plate defining an upper surface configured to engage a lower surface of the offshore wind turbine platform. The floating base has at least a ballast receiving volume, the intervention platform having a ballast controller configured to control a quantity of ballast received in the ballast receiving volume to lift the upper surface of the offshore heave plate in contact with the lower surface of the offshore wind turbine platform.

A method is for repairing a shear web of a wind turbine rotor blade, wherein the shear web includes a defect at the root end, the defect running essentially along a longitudinal direction of the wind turbine rotor blade. The method includes the steps of: providing a defect-bridging device having a first cover plate and a second cover plate, both the first cover plate and the second cover plate including an inner surface and an outer surface, and bonding the first cover plate with its inner surface onto a first surface region of the shear web and bonding the second cover plate with its inner surface onto a second surface region of the shear web, such that both cover plates at least partly cover the defect. A repair assembly is for repairing a shear web of a wind turbine rotor blade.