Lifting device for connecting two rotor blade segments of a wind turbine

Abstract

A lifting device for connecting two rotor blade segments of a wind turbine at the location of the wind turbine is adapted to move in the longitudinal direction of the rotor blade. The lifting device includes a frame structure, means for supporting and guiding the frame structure in relation to the rotor blade, means for lowering and/or lifting the frame structure in relation to the rotor blade, and means for lifting and/or lowering a rotor blade segment.

Claims

1. A lifting device for connecting two rotor blade segments of a wind turbine, said lifting device being adapted for being moved in the longitudinal direction of the rotor blade, the lifting device comprising: a frame structure, means for supporting and guiding the frame structure in relation to the rotor blade, means for lowering and/or lifting the frame structure in relation to the rotor blade, and means for lifting and/or lowering a rotor blade segment, wherein the frame structure comprises a first part of a coupling guide for guiding a coupling of a first rotor blade segment and second rotor blade segment, and wherein said means for supporting and guiding the frame structure in relation to the rotor blade comprises a plurality of contact means.

2. A lifting device according to claim 1, wherein the frame structure comprises a plurality of first parts of the coupling guide for guiding the coupling of the first rotor blade segment and the second rotor blade segment.

3. A lifting device according to claim 2, wherein the coupling guide is a self adjusting coupling guide.

4. A lifting device according to claim 1, wherein the coupling guide is a self adjusting coupling guide.

5. A lifting device according to claim 1, wherein said means for supporting and guiding the frame structure in relation to the rotor blade are configured for contacting the rotor blade at regions at or near the front edge of the rotor blade and/or at or near the rear edge of the rotor blade.

6. A lifting device according to claim 1, wherein the frame structure comprises a work platform adapted to carry one or more individuals and/or a tool, a robot, and/or an apparatus for performing the connection of the two rotor blade segments.

7. A lifting device according to claim 1, wherein said means for supporting and guiding the frame structure in relation to the rotor blade are configured for being adjusted to the rotor blade during movement of the lifting device in order to maintain controllable contact at said regions.

8. A lifting device according to claim 1, wherein at least one of said plurality of contact means is adapted for contacting the rotor blade at a plurality of points and/or at adjoining points.

9. A lifting device according to claim 8, wherein said at least one of said plurality of contact means for contacting the rotor blade comprises brush support means or belt support means.

10. A lifting device according to claim 8, wherein said at least one of said plurality of contact means comprises a plurality of balls or rollers.

11. A lifting device according to claim 1, wherein said contact means for contacting the rotor blade comprises brush support means or belt support means.

12. A lifting device according to claim 1, wherein said contact means comprises a plurality of balls or rollers.

13. A lifting device according to claim 1, wherein said means for supporting and guiding the frame structure in relation to the rotor blade comprises means for determining contact load at said regions of the rotor blade, the means for determining contact load including strain gauges and/or weighing cells, thereby facilitating detection and/or measurement of unbalance and variations in wind pressure, variations in rotor blade dimensions, including width, size, and/or shape.

14. A lifting device according to claim 1, wherein said frame structure has an open configuration or is adapted for being opened by having a releasable frame part and/or one or more frame parts that are pivotal.

15. A lifting device according to claim 1, wherein the frame structure further comprises means for supporting the lifting device in relation to a wind turbine tower, said means for supporting the lifting device in relation to the wind turbine tower being configured for displacing the device in relation to said wind turbine tower when the lifting device is transferred to or removed from the rotor blade of a wind turbine.

16. A lifting assembly for connecting two or more rotor blade segments of a rotor blade, the assembly comprising: a lifting device being adapted for being moved in the longitudinal direction of the rotor blade, the lifting device comprising: a frame structure, means for supporting and guiding the frame structure in relation to the rotor blade, means for lowering and/or lifting the frame structure in relation to the rotor blade, and means for lifting and/or lowering a rotor blade segment, wherein the frame structure comprises a first part of a coupling guide for guiding a coupling of a first rotor blade segment and second rotor blade segment, and wherein said means for supporting and guiding the frame structure in relation to the rotor blade comprises a plurality of contact means, and a fixation part having means for fixation of a rotor blade segment, the fixation part further comprising means for connecting the fixation part to the means for lifting and or lowering a rotor blade segment placed in connection with the lifting device.

17. The lifting assembly according to claim 16, wherein the fixation part is detachably attached to the means for lifting and or lowering a rotor blade segment placed on the lifting device and movable in relation to the frame structure and carried by said frame structure.

18. The lifting assembly according to claim 16 wherein the fixation part comprises a second part of the coupling guide for guiding the coupling of the first rotor blade segment and the second rotor blade segment.

19. A lifting assembly according to claim 18, wherein the coupling guide is a self-adjusting coupling guide.

Description

THE FIGURES

(1) The invention will be described in detail in the following with reference to the drawings, in which

(2) FIG. 1 shows a wind turbine and a lifting device for connecting two rotor blade segments.

(3) FIG. 2-4 show the section A from FIG. 1 when two rotor blade segments of a wind turbine are being connected.

(4) FIG. 5-21 show various contact means and associated devices for use in connection with embodiments of the invention.

DETAILED DESCRIPTION

(5) The lifting device and a method for connecting two rotor blade segments will be explained in general with reference to FIGS. 1-4.

(6) FIGS. 1-4 illustrate the lifting device in a schematic matter.

(7) FIG. 1 discloses a wind turbine tower 1 upon which a nacelle 2 is mounted. From the nacelle 2 extends a non-visible main shaft comprising a hub 3 on which a rotor blade (4) is mounted.

(8) In the shown situation only one rotor blade 4 is disclosed. The wind turbine is stopped and the rotor blade 4 shown is in an essentially vertical position and has the rear edge of the rotor blade near the tower 1.

(9) FIGS. 2-4 illustrate the section A from FIG. 1 where two rotor blade segments 4A and 4B are being connected. The figures present a sequence, showing the method for connecting the rotor blade segments 4A, 4B. The lifting device 5 is lowered down to the end of the first rotor blade segment 4A. The FIGS. 2-4 disclose the frame structure 6, but the means for lowering and/or lifting the frame structure in relation to the rotor blade 4 is not disclosed in these figures. A fixation part 9 is fixed to a second rotor blade segment 4B. The fixation part 9 is detachably attached to the means 7 for lifting and/or lowering a rotor blade segment placed on the lifting device 5. The fixation part and the rotor blade segment 4B are lifted up. A coupling guide 10 placed on the fixation part 9 is automatically coupled to a corresponding coupling guide 8 placed on the lifting device 5. When the fixation part 9 and the second rotor blade segment 4B are lifted further up, the self-adjusting coupling guides 8 and 10 are automatically connecting the two rotor blade segments 4A and 4B in a correct angle in relation to one another. When the rotor blade segments 4A and 4B are connected and fixed to each other, the fixation part 9 can be detached from the rotor blade segment 4B and lowered down. If the rotor blade has more than two rotor blade segments 4A and 4B, it will be possible to continue the process by lowering the lifting device to the end of the second rotor blade segment 4B and repeat the above process.

(10) Different types of means for supporting and guiding the frame structure in relation to the rotor blade have been described in the summary of the invention in a general manner, although it has been mentioned that the rear contact means may preferably comprise brush means, e.g. industrial brushes, comprise belts, drums, rollers or the like. The contact means are adapted for transferring a load to the rotor blade in such a manner that the rotor blade is not damaged. The contact means are furthermore adapted to be moved along the surface with only little friction and preferably moves not only linearly, i.e. move in an omnidirectional manner.

(11) In the following, contact means will be described with reference to FIGS. 5-21.

(12) FIG. 5 shows a brush contact means 101 in a side view. As shown, the brush contact means 101 comprises a base part 102 carrying a plurality of bristles 103, as mentioned, for example, industrial bristles for e.g. conveying purposes. The brush contact means 101 has the advantage that the bristles adapt to the surface of the rotor blade, that the bristles contact the rotor blade at a large number of positions, that the friction is relatively low, that the bristles are not oriented and may move in any direction, i.e. omnidirectionally, and that in general the bristles are gentle to the surface, whereby load damage, scratches and abrasion can be avoided. The size of the base part 102 and/or the number of bristles 103 may be designed in view of the load that has to be transferred.

(13) FIG. 6 illustrates that a plurality of such brush contact means 101 may be combined to form a unified contact means 105. The individual brush contact means 101 may be connected to each other in a rigid manner, but preferably they are connected to each other in at least a resilient and flexible manner.

(14) FIG. 7 illustrates how a plurality of brush contact means 101 may be combined to form a contact means 106 that can adapt to the surface by having a number of carriers 107 and 108 connected pivotally to each other and to the brush contact means 101.

(15) FIG. 8 illustrates a further contact means 110 in a side view. This contact means 110 comprises a base part 111 with an inlet 113 for e.g. compressed air and has an air chamber 112 having outlets (not shown) facing downwards, e.g. a plurality of holes, slits or the like, or air outlets in any suitable form for establishing an air cushion towards the surface of the rotor blade, whereby omnidirectional movement can be achieved.

(16) Further, liquid contact to the surface of the rotor blade may also be used for establishing omnidirectionally movable contact means.

(17) As shown in FIG. 9, a plurality of such air cushion contact means may be combined to form a unified contact means 115 in a manner corresponding to what has been explained above in connection with FIGS. 6 and 7.

(18) FIGS. 10 and 11 show a further embodiment of a contact means 120, seen from the side and from the end, respectively, where a plurality of modular contact means 110 are combined in a flexible manner. Here, a number of carriers 121, 122 and 123 are connected pivotally to each other and to the brush contact means 110, e.g. in such a manner that pivotal movement is obtained in relation to a plurality of axes, including axes that are perpendicular to each other. Hereby, the contact means may adapt to the curvature of the surface in two directions.

(19) FIG. 12 shows a schematic, sectional view of a rotor blade 54 together with two front contact means 130 also schematically shown. Each of these comprises two drums or the like 132 placed with their axes essentially in parallel with the rotor blade or with only a small angular difference. On these drums or the like 132 a belt-type element 131 is placed, which may move around the drums or the like 132, e.g. effecting a movement in the transverse direction of the rotor blade 54. This arrangement is also illustrated in a schematic manner in FIG. 13 in a perspective view of part of the rotor blade and the front contact means 130. As shown here, the belt-type element 131 may comprise elements 135, which can cause a movement in the longitudinal direction of the rotor blade and which will be described in the following.

(20) FIG. 16 illustrates such a belt-type element 131, where a pair of flexible elements 137, e.g. chains or the like, carry a plurality of roller elements 136, each one comprising a number of rollers 138 as also shown in FIGS. 17 and 19. FIG. 18 shows such a roller 138 comprising an outer roller carried by bearing means 139.

(21) An alternative embodiment of such a belt-type element 131 is illustrated in FIG. 15, where it is shown that the belt-type element 131 may comprise a plurality of flexible elements 141, for example wires, chains, etc. that extend around the drums or the like 132, each carrying a plurality of rollers 142 as also shown in FIG. 14, where a small part of a flexible element 141 is shown with two rollers 142. Thus, it will be understood that such an arrangement will serve to take care of a movement in the longitudinal direction of the rotor blade due to the rollers 142 and will also serve to take care of a movement in the transverse direction of the rotor blade because the flexible elements 141 can be moved in this direction, carried by the drums or the like 132.

(22) In FIG. 20 a rotor blade 54 and two contact means 130 are shown in a schematic manner in a sectional view. In this view each front contact means 130 comprises five drums, rollers or the like placed with their axes essentially tangentially to the rotor blade. The drums, rollers or the like will be in contact with the rotor blade and serve to take care of a movement in the longitudinal direction of the rotor blade. FIG. 21 illustrates the front contact means 130 from FIG. 20 as a cassette. The cassette carrying the drums, rollers or the like can be pivoted arbitrarily and will thereby serve to take care of a movement in the transverse direction of the rotor blade. Even though the cassette is shown with five drums, rollers or the like, the number of drums, rollers or the like can be both more and less. The length of the drums, rollers or the like and the distance between the drums can also be selected to be different.

(23) It will be understood that other embodiments, variations, etc. are possible when designing such contact means and that combinations hereof are possible as well.