WO2017131515A1 - Device and method for handling a wind turbine rotor blade - Google Patents

Device and method for handling a wind turbine rotor blade Download PDF

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Publication number
WO2017131515A1
WO2017131515A1 PCT/NL2017/050047 NL2017050047W WO2017131515A1 WO 2017131515 A1 WO2017131515 A1 WO 2017131515A1 NL 2017050047 W NL2017050047 W NL 2017050047W WO 2017131515 A1 WO2017131515 A1 WO 2017131515A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor blade
engaging
engaging means
support element
frame
Prior art date
Application number
PCT/NL2017/050047
Other languages
French (fr)
Inventor
René Michel BEUKERS
Original Assignee
Fmi Development Holding B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fmi Development Holding B.V. filed Critical Fmi Development Holding B.V.
Publication of WO2017131515A1 publication Critical patent/WO2017131515A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/50—Maintenance or repair
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
    • F03D13/40—Arrangements or methods specially adapted for transporting wind motor components
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • the invention relates to a device for handling a wind turbine rotor blade, which rotor blade has an at least substantially round base as well as an unround tip opposite the base, the device comprising first engaging means for engaging the base of the rotor blade and second engaging means for engaging the tip of the rotor blade, which first and second engaging means are configured to rotate the rotor blade about a longitudinal axis of the rotor blade, the device further comprising drive means for rotatably driving the rotor blade about its longitudinal axis whilst the rotor blade is being engaged by the first engaging means and the second engaging means.
  • the frame part is pivotally connected to the ring about a pivot axis that extends in a vertical plane parallel to the longitudinal direction of the rotor blade.
  • the tip of the rotor blade extends through the passage and is held in position by four holding elements associated with the frame part.
  • the ring can be rotatably driven about its axis through at most 260 degrees, making it possible to rotate the rotor blade as well.
  • the use of the holding elements on the side of the tip and in particular of the rollers on the side of the base can locally generate a high surface pressure.
  • This risk is greater if the base is not perfectly round and/or if the base and the cup shape of the rollers are not exactly concentric. In fact, this may lead to a situation in which the base is not supported on four rollers but only on three or two rollers.
  • the object of the invention is to reduce the above risk to a significant extent.
  • the device is characterised in that at least one of the first engaging means and the second engaging means comprises a frame, pulley means that are rotatably connected to the frame and a flexible elongate support element that is passed over the pulley means, wherein two higher pulley means of said pulley means are positioned in such a manner relative to each other that the support element has a concave shape between the two higher pulley means for supportingly receiving part of the rotor blade in the concave portion of the support element, and that the drive means are configured to drive the flexible elongate support element.
  • the rotor blade is supported over a larger area, as a result of which the surface pressure on the rotor blade and thus the risk of delamination decreases.
  • a device for handling a wind turbine rotor blade which rotor blade has an at least substantially round base as well as an unround tip opposite the base, the device comprising first engaging means for engaging the base of the rotor blade and second engaging means for engaging the tip of the rotor blade, which first and second engaging means are configured to rotate the rotor blade about a longitudinal axis of the rotor blade, the device further comprising drive means for rotatably driving the rotor blade about its longitudinal axis whilst the rotor blade is being engaged by the first engaging means and the second engaging means, characterised in that at least one of the first engaging means and the second engaging means comprises a frame, pulley means that are rotatably connected to the frame and a flexible elongate support element that is passed over the pulley means, wherein two higher pulley means of said pulley means are positioned in such a manner relative to each other that the support element has a concave shape between the two higher pulley means for supportingly receiving part of the rotor blade
  • the elongate support element is preferably an endless element. A separate connection of ends of the support element to the frame is thus not needed and driving the support element in two opposite directions can moreover take place in a simple manner using one driving motor or, in general, one driving system.
  • the device preferably comprises adjusting means for adjusting the two higher pulley means for height within a range of at least 30 cm, further preferably within a range of at least 60 cm. Adjusting the pulley means for height makes it possible to adjust the rotor blade for height as well.
  • the device may also comprise further adjusting means for adjusting the frame for height between a position in which the frame is supported on the ground surface and a position in which the frame is clear of the ground surface, preferably by at least 2 cm.
  • the first engaging means comprise first weighing means for measuring the load on the engaging means from the weight of a rotor blade that is partially supported by the first engaging means
  • the second engaging means comprise second weighing means for measuring the load on the second engaging means from the weight of a rotor blade that is partially supported by the second engaging means
  • the device further comprises calculating means for determining the mass and/or the position of the centre of gravity of the rotor blade in dependence on signals from the first weighing means and from the second weighing means. This information may be useful, for example, when the rotor blade is taken over from the device according to the invention by a crane.
  • the flexible elongate support element can in particular be advantageous for the base of a rotor blade.
  • the first engaging means preferably comprise a frame, pulley means that are rotatably connected to the frame and a flexible elongate support element that is passed over the pulley means, wherein two higher pulley means are positioned in such a manner relative to each other that the support element has a concave shape between the two higher pulley means for supportingly receiving part of the rotor blade in the concave portion of the support element, wherein the drive means comprise a first drive unit for driving the support element of the first engaging means.
  • the drive means comprise a second drive unit for rotatably driving the second engaging means or at least a part thereof that is in engaging contact with a rotor blade in use.
  • This second drive unit preferably functions to support the first drive unit so as to thus reduce the torsional load on the rotor blade.
  • the device comprises at least one arm that is connected to the frame of the first engaging means for pivoting about a pivot axis between an outer position and an inner position, wherein one of the two higher pulley means is rotatably connected to the at least one arm, wherein the higher pulley means in question is located closer to the other higher pulley means in the inner position than in the outer position, and wherein the device is configured to pivot the arm from the outer position to the inner position upon or after supportingly receiving the base of the rotor blade in the concave portion of the support element.
  • the length of the support element that is in contact with the base can thus be increased, so that the contact pressure is reduced and a more stable support is obtained.
  • the present embodiment further provides the advantageous possibility to have the support element embrace the base over more than 180 degrees, so that the base is retained by the support element, which further increases the level of safety in the use of the device according to the invention.
  • the device comprises two arms, which are each connected to the frame of the first engaging means for pivoting about a pivot axis between respective outer and inner positions, wherein each one of the two higher pulley means is rotatably connected to one of the two arms.
  • the pivot axis associated with the at least one arm is preferably located below the associated higher pulley means both in the inner position and in the outer position, and/or the connecting line between the pivot axis of the associated at least one arm and the central axis of the associated higher pulley means extends vertically or is inclined at most 15 degrees in the outer position of the at least one arm. In this way a compact construction can be obtained.
  • the device comprises spring means for causing the at least one arm to incline toward the outer position.
  • the pivoting toward each other of the higher pulley means in that case takes place against the action of the spring means and is in general preferably caused by the load exerted on the support element by the rotor blade when, in use, the base is supportingly received in the concave portion of the support element.
  • both the first engaging means and the second engaging means comprise a frame, pulley means that are rotatably connected to the frame and a flexible elongate support element that is passed over the pulley means, wherein two of said pulley means are positioned in such a manner relative to each other that the support element has a concave shape between the two pulley means in question for supportingly receiving part of the rotor blade in the concave portion of the support element.
  • the second engaging means preferably comprise a clamping element which is provided on the support element of the second engaging means, at the location of the concave portion thereof, and which comprises at least two clamping element parts which are movable relative to each other between an open position, in which the unround tip of a rotor blade can be placed on at least one clamping element part, and a closed position, in which the clamping element parts define a shape on the inner side thereof that corresponds to the cross-sectional shape of the tip, so that the tip is accommodated in an at least substantially form- locked manner in the clamping element. In this way a very reliable and stable engagement of the tip of a rotor blade can be obtained.
  • the at least one clamping element part on which the unround tip of a rotor blade can be placed in the open position of the clamping element comprises shaped parts, and the frame of the second engaging means is provided with counter-shaped parts, wherein the at least one clamping element part can be supported on the frame, wherein the shaped parts and the counter-shaped parts work in concert to prevent displacement of the at least one clamping element part relative to the frame.
  • first engaging means and/or the second engaging means are at least substantially U-shaped.
  • the horizontal web portion of the U-shape contributes to the stability of supporting the device on a ground surface, whilst the rotor blade can be entirely or partially positioned within the legs of the U-shape, so that the centre of gravity of the rotor blade can be relatively low.
  • the invention also relates to a method for handling a wind turbine rotor blade, using a device according to the invention as described in the foregoing.
  • the method comprises the steps of engaging the base of the rotor blade, using the first engaging means, to which end the base of the rotor blade is moved downward at least in part between two higher pulley means of the first engaging means and placed on the concave portion of the flexible elongate support element of the first engaging means, - engaging the tip of the rotor blade, using the second engaging means,
  • the base of the rotor blade may be engaged by the first engaging means, the base, at least the centre of the base, of the rotor blade is moved downward between two higher pulley means of the first engaging means.
  • the two higher pulley means are moved toward each other while or after the base of the rotor blade is being/has been moved downward.
  • the length of the support element that is in contact with the base can thus be increased, so that the contact pressure is decreased, a more stable support is obtained and a greater driving force can be transmitted from the support element to the rotor blade.
  • the two higher pulley means are moved toward each other to such an extent that the facing sides of the two higher pulley means are spaced from each other by a distance smaller than the diameter of the base.
  • the base will be embraced over more than 180 degrees by the support element, thereby increasing the level of safety in the use of the device according to the invention.
  • Figure 1 is a first perspective view of a wind turbine rotor blade as well as a device for handling the rotor blade
  • Figure 2 is a second perspective view of the rotor blade shown in figure 1 and the device shown in figure 1 ;
  • Figure 4 is a perspective view of a second part of the device shown in figures 1 and 2 for handling the rotor blade;
  • FIGS. 5a-f show various views, partly in section, of the second part of the device for handling the rotor blade with the rotor blade fixed therein. Like parts are indicated by the same numerals in the figures.
  • Figures 1 and 2 show a device 100 positioned on a ground surface, which device comprises a first engaging part 1 and a second engaging part 3.
  • the second engaging part 3 can be moved over the ground surface and be disposed at a predetermined distance from the first engaging part 1 .
  • a wind turbine rotor blade 5 can be supported by means of the engaging parts 1 , 3 disposed on a ground surface. As shown in figures 3a and 5a, for example, the first engaging part 1 and the second engaging part 3 are both U- shaped. In this way a stable support of a rotor blade 5 can be obtained.
  • the rotor blade 5 is positioned at a predetermined or adjustable height from a ground surface so that the rotor blade can be handled, making it easy to work or treat the rotor blade 5 mechanically or manually.
  • the device 100 it is for example possible to provide the rotor blade 1 at least in part or substantially entirely with a coating layer.
  • the rotor blade 5 has a base 7 and a tip 9.
  • the base 7 is formed by a part of the rotor blade 5 that is located at the round end (at the bottom left in figure 1 ), via which the rotor blade 5 is eventually mounted to a rotor. That part of the rotor blade 5 has a round or at least substantially round cross-section, for example such that two perpendicular diameters of the cross-section differ at most 80 % from each other.
  • the tip 9 is formed by a part of the rotor blade 5 opposite the base 7, which part is adjacent to the pointed end of the rotor blade 5 opposite the round end (at the top right in figure 1).
  • the rotor blade 5 has a clearly unround, as a rule flat, shape with a width/thickness ratio of at least 2, for example.
  • the base 7 and the tip 9 are located on opposite sides of the centre of gravity of the rotor blade 5, which centre of gravity is typically located within a distance of 20 - 45 %, for example at a distance of 30 %, of the length of the rotor blade 5 from the round end of the rotor blade 1 .
  • the first engaging part 1 is configured to engagingly support the base 7 of the rotor blade 5, and the second engaging part 3 is configured to engagingly support the tip 9 of the rotor blade 5.
  • the first and the second engaging parts 1 , 3 are further configured to be capable of rotating the rotor blade 5 about a longitudinal axis of the rotor blade 5 for handling the rotor blade 5.
  • the first engaging part 1 and the second engaging part 3 each comprise a frame 1 1 , 13, four pulley means 15, 17, 27, 29 and 19, 21 , 23, 25, which are rotatably connected to the associated frame 1 1 , 13, and a flexible, elongate endless strap 35, 37 that is passed over at least the associated four pulley means.
  • the straps 35, 37 may be made of a polyester fabric, which may be provided with a coating, for example a polyurethane coating, so as to increase the frictional resistance.
  • each frame 1 1 , 13 The two uppermost pulley means 15, 17 and 19, 21 of each frame 1 1 , 13 are positioned in such a manner relative to each other that the strap 35, 37 has a concave shape between the two pulley means in question for supportingly receiving part of the rotor blade in the concave portion of the strap.
  • the concave shape of the strap 35 between the two pulley means 15, 17 is clearly shown for the first frame 1 , for example.
  • the two higher pulley means 15, 17 of the first engaging part 1 are rotatably connected to the arms 61 , 63, with the higher pulley means 15, 17 being located closer together in the inner position than in the outer position.
  • the pivot axes 65, 67 are located below the associated higher pulley means 15, 17 in question both in the inner position and in the outer position.
  • the device 100 is configured to pivot the arms 61 , 63 from the outer position to the inner position under the influence of the weight of the rotor blade 5 upon receiving the base 7 of the rotor blade 5 in the concave shape of the strap 35 for supporting the same therein.
  • the frame 1 1 further comprises a spring 75 (figure 3a) for causing the at least one arm 61 , 63 to incline to the outer position when inactive (figures 3a), i.e. without the first engaging part 1 of the device 100 supporting a rotor blade 5.
  • the arms are slightly inclined toward each other, so that the distance between the facing sides of the higher pulley means 15, 17 is smaller than the diameter of the base 7.
  • the base 7, whose centre 66 is located lower than the higher pulley means 15, 17, is embraced over more than 180 degrees of its circumference by the strap 35.
  • the first engaging part 1 of the device 100 further comprises a drive unit 20 for rotatably driving the rotor blade 5 about its longitudinal axis, whilst the rotor blade 5 is engaged by the first engaging part 1 and by the second engaging part 3.
  • the drive unit 20 comprises a motor 22 and a drive roller 31 for driving the strap 35 of the first engaging part 1 that is passed over four pulley means 15, 17, 27, 29.
  • the second engaging part 3 is configured to supportingly receive the tip 9 of the rotor blade 5.
  • a grip clamp 55 is provided on the strap 37, in the concave part that extends between the higher pulley means 19, 21 , which grip clamp may be provided with a lining (not shown), for example of a rubbery material or in general of the material having a relatively high coefficient of friction.
  • the grip clamp 55 comprises two lightly bent grip clamp parts 56, 58, which are pivotally interconnected by means of a hinge 57.
  • the tip 9 of the rotor blades 5 can be positioned on the lower grip clamp part 58 in the grip clamp 55, whereupon the grip clamp 55 can be closed by pivoting the upper grip clamp part 56 downward about the hinge 57.
  • the two grip clamp parts 56, 58 of the grip clamp 55 can be manually interconnected by an operator and closed by means of a fastener 60.
  • the grip clamp parts 56, 58 define a shape that corresponds to the cross- sectional shape of the tip 9, so that the tip 9 is accommodated in a form-locked manner in the closed position of the grip clamp 55.
  • the second engaging part 3 also comprises four height-adjustable legs 45, by means of which the frame 13 of the second engaging part 3 can be adjusted for height.
  • the range of the height-adjustable legs 45 is about 100 cm, for example.
  • the legs 45 can be supported on the ground surface via wheels 47, so that the underside of the frame 13 is positioned 10 cm above the ground surface (not specifically shown), for example, and the second engaging part 3 can be wheeled over a ground surface relative to the first engaging part 1 , so that it is possible to adapt the distance therebetween and to align the second engaging part 3 with the first engaging part 1 .
  • the height-adjustable legs 45 make it possible to vary the height of the pulley means 19, 21 mounted to the upper ends of the legs 45 relative to the ground surface.
  • the height-adjustable legs 45 each comprise a dual action cylinder 90 for moving the leg parts of each leg 45 of the second engaging part 3 relative to each other (see figures 5c and 5d).
  • the frame 13 By extending the cylinders 90 from the non-adjusted compact condition, the frame 13 initially comes to be supported on the ground surface in that the wheels 47 come loose from the ground surface. Subsequently, the pulley means 19, 21 move upward. As a result, the grip clamp 55 and the tip 9 that may be present therein will also move upward, viz over a distance twice as large as the distance over which the pulley means 19, 21 move upward. At the base, this difference in height results in an angular displacement. Because the strap 35 of the first engaging part 1 is flexible, this angular displacement is compensated.
  • the frame 13 of the second engaging part 3 of the device 100 further comprises a support element 40 for supporting the lower grip clamp part 58 of the grip clamp 55, so that the tip 9 is easy to position in the lower grip clamp part 58 without distortion of the strap 37 with the grip clamp part 58 being possible.
  • the support element 40 is provided with two support plates 46, 48 provided with recesses 42, between which the lower grip clamp part 58 can be position, wherein protruding pins 52 of the grip clamp 55 slip into the recesses 42, so that distortion of the grip clamp 55 on the support element is virtually impossible.
  • the pins 52 form the shaped parts of the grip clamp 55 and the recesses 42 form the counter-shaped parts, which shaped parts and counter-shaped parts work in concert to prevent displacement of the grip clamp 55 relative to the frame 13.
  • the upper grip clamp part 56 is provided with protruding pins 52, which can also work in concert with the recesses 42 in case a rotor blade has rotated through 180 degrees.
  • the initially upper grip clamp part 56 will in that case be positioned under the initially lower grip clamp part 58.
  • the movable support element may be disposed between the support plates 46, 48, for example, in which case the support element can move up and down relative to the frame 13 between a non-operative low position and an operative high position, in which operative position the support element abuts against the underside of the strap 37, and in which non-operative position the support element is clear of the strap 37.
  • the first engaging part 1 comprises a first weighing unit (not shown) for measuring the load on the device 100 from the weight of a rotor blade 5 that is partially supported by the first engaging means 1
  • the second engaging part 3 comprises a second weighing unit (not shown) for measuring the load on the second engaging part 3 from the weight of a rotor blade 5 that is partially supported by the second engaging means.
  • the device 100 further comprises calculating means (not shown) for determining the mass and/or the position of the centre of gravity of the rotor blade 5 in dependence on signals from the first weighing unit and from the second weighing unit.
  • the second engaging part 3 instead of or in addition to the drive unit 20 with a further drive unit (not shown) for rotatably driving a tip 9 of the rotor blade 5 being engaged by the second engaging part 3.
  • the further drive unit is preferably used for driving the strap 37 of the second engaging means.
  • This optional drive unit preferably functions to support the drive unit 20 so as to thus reduce the torsional load on the rotor blade 5.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Abstract

The invention provides a device and a method for handling a wind turbine rotor blade. The device comprises first engaging means for engaging a round base of the rotor blade and second engaging means for engaging the unround tip of the rotor blade. The first and second engaging means are configured to rotate the rotor blade about a longitudinal axis of the rotor blade, the device further comprising drive means for rotatably driving the rotor blade about its longitudinal axis whilst the rotor blade is being engaged by the first engaging means and the second engaging means. At least one of the first engaging means and the second engaging means comprises a frame, pulley means that are rotatably connected to the frame and a flexible elongate support element that is passed over the pulley means. Two higher pulley means of the pulley means are positioned in such a manner relative to each other that the support element has a concave shape between the two higher pulley means for supportingly receiving part of the rotor blade in the concave portion of the support element, and the drive means are configured to drive the flexible elongate support element.

Description

Title: Device and method for handling a wind turbine rotor blade
Description
The invention relates to a device for handling a wind turbine rotor blade, which rotor blade has an at least substantially round base as well as an unround tip opposite the base, the device comprising first engaging means for engaging the base of the rotor blade and second engaging means for engaging the tip of the rotor blade, which first and second engaging means are configured to rotate the rotor blade about a longitudinal axis of the rotor blade, the device further comprising drive means for rotatably driving the rotor blade about its longitudinal axis whilst the rotor blade is being engaged by the first engaging means and the second engaging means.
Such a device is known from US publication US 2014/03561 13 A1. Said publication discloses a support device for a rotor blade. This device comprises a frame with four rollers arranged in the form of a cup for use at the round base of the rotor blade, on which the base can be supported. The cup shape is selected so that the centre of the cup shape is concentric with the centre of the round base. The device comprises a ring for use at the tip of the rotor blade, which ring is pivotally connected to two legs about a horizontal pivot axis that extends perpendicular to the longitudinal direction of the rotor blade. Provided within the ring is a frame part provided with a passage. The frame part is pivotally connected to the ring about a pivot axis that extends in a vertical plane parallel to the longitudinal direction of the rotor blade. In use, the tip of the rotor blade extends through the passage and is held in position by four holding elements associated with the frame part. The ring can be rotatably driven about its axis through at most 260 degrees, making it possible to rotate the rotor blade as well.
With such a device, the use of the holding elements on the side of the tip and in particular of the rollers on the side of the base can locally generate a high surface pressure. This entails the risk of local delamination at the surface of the rotor blade. This risk is greater if the base is not perfectly round and/or if the base and the cup shape of the rollers are not exactly concentric. In fact, this may lead to a situation in which the base is not supported on four rollers but only on three or two rollers. The object of the invention is to reduce the above risk to a significant extent. In order to achieve that object, the device is according to the invention characterised in that at least one of the first engaging means and the second engaging means comprises a frame, pulley means that are rotatably connected to the frame and a flexible elongate support element that is passed over the pulley means, wherein two higher pulley means of said pulley means are positioned in such a manner relative to each other that the support element has a concave shape between the two higher pulley means for supportingly receiving part of the rotor blade in the concave portion of the support element, and that the drive means are configured to drive the flexible elongate support element. By making use of the flexible elongate support element, which is for example configured as a strap of a plastic material, the rotor blade is supported over a larger area, as a result of which the surface pressure on the rotor blade and thus the risk of delamination decreases.
A device for handling a wind turbine rotor blade, which rotor blade has an at least substantially round base as well as an unround tip opposite the base, the device comprising first engaging means for engaging the base of the rotor blade and second engaging means for engaging the tip of the rotor blade, which first and second engaging means are configured to rotate the rotor blade about a longitudinal axis of the rotor blade, the device further comprising drive means for rotatably driving the rotor blade about its longitudinal axis whilst the rotor blade is being engaged by the first engaging means and the second engaging means, characterised in that at least one of the first engaging means and the second engaging means comprises a frame, pulley means that are rotatably connected to the frame and a flexible elongate support element that is passed over the pulley means, wherein two higher pulley means of said pulley means are positioned in such a manner relative to each other that the support element has a concave shape between the two higher pulley means for supportingly receiving part of the rotor blade in the concave portion of the support element, and that the drive means are configured to drive the flexible elongate support element.
The elongate support element is preferably an endless element. A separate connection of ends of the support element to the frame is thus not needed and driving the support element in two opposite directions can moreover take place in a simple manner using one driving motor or, in general, one driving system. The device preferably comprises adjusting means for adjusting the two higher pulley means for height within a range of at least 30 cm, further preferably within a range of at least 60 cm. Adjusting the pulley means for height makes it possible to adjust the rotor blade for height as well.
The device may also comprise further adjusting means for adjusting the frame for height between a position in which the frame is supported on the ground surface and a position in which the frame is clear of the ground surface, preferably by at least 2 cm. This achieves the advantage that a very stable situation can be obtained in the former position, whilst in the latter position the engaging means in question can be easily moved, for example if the engaging means are supported on the ground surface via wheels.
It may also be very advantageous if the first engaging means comprise first weighing means for measuring the load on the engaging means from the weight of a rotor blade that is partially supported by the first engaging means, and that the second engaging means comprise second weighing means for measuring the load on the second engaging means from the weight of a rotor blade that is partially supported by the second engaging means, wherein the device further comprises calculating means for determining the mass and/or the position of the centre of gravity of the rotor blade in dependence on signals from the first weighing means and from the second weighing means. This information may be useful, for example, when the rotor blade is taken over from the device according to the invention by a crane.
Making use of, inter alia, the flexible elongate support element can in particular be advantageous for the base of a rotor blade. Within that framework, at least the first engaging means preferably comprise a frame, pulley means that are rotatably connected to the frame and a flexible elongate support element that is passed over the pulley means, wherein two higher pulley means are positioned in such a manner relative to each other that the support element has a concave shape between the two higher pulley means for supportingly receiving part of the rotor blade in the concave portion of the support element, wherein the drive means comprise a first drive unit for driving the support element of the first engaging means.
In combination with the preceding possible embodiment of a device according to the invention, it may further be advantageous if the drive means comprise a second drive unit for rotatably driving the second engaging means or at least a part thereof that is in engaging contact with a rotor blade in use. This second drive unit preferably functions to support the first drive unit so as to thus reduce the torsional load on the rotor blade.
It may further be advantageous if the device comprises at least one arm that is connected to the frame of the first engaging means for pivoting about a pivot axis between an outer position and an inner position, wherein one of the two higher pulley means is rotatably connected to the at least one arm, wherein the higher pulley means in question is located closer to the other higher pulley means in the inner position than in the outer position, and wherein the device is configured to pivot the arm from the outer position to the inner position upon or after supportingly receiving the base of the rotor blade in the concave portion of the support element. The length of the support element that is in contact with the base can thus be increased, so that the contact pressure is reduced and a more stable support is obtained. The present embodiment further provides the advantageous possibility to have the support element embrace the base over more than 180 degrees, so that the base is retained by the support element, which further increases the level of safety in the use of the device according to the invention.
In order to make it easier to supportingly receive the rotor blade, it is further preferable if the device comprises two arms, which are each connected to the frame of the first engaging means for pivoting about a pivot axis between respective outer and inner positions, wherein each one of the two higher pulley means is rotatably connected to one of the two arms.
The pivot axis associated with the at least one arm is preferably located below the associated higher pulley means both in the inner position and in the outer position, and/or the connecting line between the pivot axis of the associated at least one arm and the central axis of the associated higher pulley means extends vertically or is inclined at most 15 degrees in the outer position of the at least one arm. In this way a compact construction can be obtained.
The constructional simplicity as well as the ease of use benefit if the device comprises spring means for causing the at least one arm to incline toward the outer position. The pivoting toward each other of the higher pulley means in that case takes place against the action of the spring means and is in general preferably caused by the load exerted on the support element by the rotor blade when, in use, the base is supportingly received in the concave portion of the support element. The advantages of the invention become obvious in particular if both the first engaging means and the second engaging means comprise a frame, pulley means that are rotatably connected to the frame and a flexible elongate support element that is passed over the pulley means, wherein two of said pulley means are positioned in such a manner relative to each other that the support element has a concave shape between the two pulley means in question for supportingly receiving part of the rotor blade in the concave portion of the support element.
The second engaging means preferably comprise a clamping element which is provided on the support element of the second engaging means, at the location of the concave portion thereof, and which comprises at least two clamping element parts which are movable relative to each other between an open position, in which the unround tip of a rotor blade can be placed on at least one clamping element part, and a closed position, in which the clamping element parts define a shape on the inner side thereof that corresponds to the cross-sectional shape of the tip, so that the tip is accommodated in an at least substantially form- locked manner in the clamping element. In this way a very reliable and stable engagement of the tip of a rotor blade can be obtained.
In order to further increase the stability upon supportingly receiving the tip of a rotor blade in the second engaging means, the at least one clamping element part on which the unround tip of a rotor blade can be placed in the open position of the clamping element comprises shaped parts, and the frame of the second engaging means is provided with counter-shaped parts, wherein the at least one clamping element part can be supported on the frame, wherein the shaped parts and the counter-shaped parts work in concert to prevent displacement of the at least one clamping element part relative to the frame.
Generally speaking, it may be advantageous if the first engaging means and/or the second engaging means are at least substantially U-shaped. The horizontal web portion of the U-shape contributes to the stability of supporting the device on a ground surface, whilst the rotor blade can be entirely or partially positioned within the legs of the U-shape, so that the centre of gravity of the rotor blade can be relatively low.
The invention also relates to a method for handling a wind turbine rotor blade, using a device according to the invention as described in the foregoing. The method comprises the steps of engaging the base of the rotor blade, using the first engaging means, to which end the base of the rotor blade is moved downward at least in part between two higher pulley means of the first engaging means and placed on the concave portion of the flexible elongate support element of the first engaging means, - engaging the tip of the rotor blade, using the second engaging means,
driving the flexible elongate support element of the first engaging means, using the driving means, for rotating the rotor blade about its longitudinal axis.
The advantages of the method according to the invention are analogous to those of the device according to the invention as already explained in the foregoing.
Generally speaking, it may be advantageous if, in order for the base of the rotor blade to be engaged by the first engaging means, the base, at least the centre of the base, of the rotor blade is moved downward between two higher pulley means of the first engaging means.
As already explained in the foregoing, it may also be preferable if, in order for the base of the rotor blade to be engaged by the first engaging means, the two higher pulley means are moved toward each other while or after the base of the rotor blade is being/has been moved downward. In absolute terms, it would also be possible in that case that only one of the two higher pulley means is moved. The length of the support element that is in contact with the base can thus be increased, so that the contact pressure is decreased, a more stable support is obtained and a greater driving force can be transmitted from the support element to the rotor blade.
In a further possible embodiment of a method according to the invention, the two higher pulley means are moved toward each other to such an extent that the facing sides of the two higher pulley means are spaced from each other by a distance smaller than the diameter of the base. As a consequence, the base will be embraced over more than 180 degrees by the support element, thereby increasing the level of safety in the use of the device according to the invention.
The invention will now be explained by means of an embodiment shown in the accompanying figures, in which:
Figure 1 is a first perspective view of a wind turbine rotor blade as well as a device for handling the rotor blade; Figure 2 is a second perspective view of the rotor blade shown in figure 1 and the device shown in figure 1 ;
Figures 3a-d show various views, partly in section, of a first part of the device shown in figures 1 and 2 for handling the rotor blade;
Figure 4 is a perspective view of a second part of the device shown in figures 1 and 2 for handling the rotor blade;
Figures 5a-f show various views, partly in section, of the second part of the device for handling the rotor blade with the rotor blade fixed therein. Like parts are indicated by the same numerals in the figures.
Figures 1 and 2 show a device 100 positioned on a ground surface, which device comprises a first engaging part 1 and a second engaging part 3. The second engaging part 3 can be moved over the ground surface and be disposed at a predetermined distance from the first engaging part 1 .
A wind turbine rotor blade 5 can be supported by means of the engaging parts 1 , 3 disposed on a ground surface. As shown in figures 3a and 5a, for example, the first engaging part 1 and the second engaging part 3 are both U- shaped. In this way a stable support of a rotor blade 5 can be obtained. Making use of the engaging parts 1 , 3 of the device 100, the rotor blade 5 is positioned at a predetermined or adjustable height from a ground surface so that the rotor blade can be handled, making it easy to work or treat the rotor blade 5 mechanically or manually. Using the device 100 it is for example possible to provide the rotor blade 1 at least in part or substantially entirely with a coating layer.
The rotor blade 5 has a base 7 and a tip 9. The base 7 is formed by a part of the rotor blade 5 that is located at the round end (at the bottom left in figure 1 ), via which the rotor blade 5 is eventually mounted to a rotor. That part of the rotor blade 5 has a round or at least substantially round cross-section, for example such that two perpendicular diameters of the cross-section differ at most 80 % from each other. The tip 9 is formed by a part of the rotor blade 5 opposite the base 7, which part is adjacent to the pointed end of the rotor blade 5 opposite the round end (at the top right in figure 1). At the tip 9, the rotor blade 5 has a clearly unround, as a rule flat, shape with a width/thickness ratio of at least 2, for example. The base 7 and the tip 9 are located on opposite sides of the centre of gravity of the rotor blade 5, which centre of gravity is typically located within a distance of 20 - 45 %, for example at a distance of 30 %, of the length of the rotor blade 5 from the round end of the rotor blade 1 .
The first engaging part 1 is configured to engagingly support the base 7 of the rotor blade 5, and the second engaging part 3 is configured to engagingly support the tip 9 of the rotor blade 5. The first and the second engaging parts 1 , 3 are further configured to be capable of rotating the rotor blade 5 about a longitudinal axis of the rotor blade 5 for handling the rotor blade 5.
The first engaging part 1 and the second engaging part 3 each comprise a frame 1 1 , 13, four pulley means 15, 17, 27, 29 and 19, 21 , 23, 25, which are rotatably connected to the associated frame 1 1 , 13, and a flexible, elongate endless strap 35, 37 that is passed over at least the associated four pulley means. The straps 35, 37 may be made of a polyester fabric, which may be provided with a coating, for example a polyurethane coating, so as to increase the frictional resistance. The two uppermost pulley means 15, 17 and 19, 21 of each frame 1 1 , 13 are positioned in such a manner relative to each other that the strap 35, 37 has a concave shape between the two pulley means in question for supportingly receiving part of the rotor blade in the concave portion of the strap. In figure 3a the concave shape of the strap 35 between the two pulley means 15, 17 is clearly shown for the first frame 1 , for example.
In the embodiment shown in the figures, the first engaging part 1 is configured differently from the second engaging part 3. The first engaging part 1 comprises arms 61 , 63 for engaging the base 7 of the rotor blades 5, which arms are each pivotally connected about a pivot axis 65, 67 to the legs 69, 71 of the frame 1 1 . The arms 61 , 63 are pivotable about the pivot axes 65, 67 between an outer position as shown in figures 3a and 3b, for example, and an inner position as shown in figures 1 , 3c and 3d, for example. The two higher pulley means 15, 17 of the first engaging part 1 are rotatably connected to the arms 61 , 63, with the higher pulley means 15, 17 being located closer together in the inner position than in the outer position. The pivot axes 65, 67 are located below the associated higher pulley means 15, 17 in question both in the inner position and in the outer position. The device 100 is configured to pivot the arms 61 , 63 from the outer position to the inner position under the influence of the weight of the rotor blade 5 upon receiving the base 7 of the rotor blade 5 in the concave shape of the strap 35 for supporting the same therein. In the outer position of the arms 61 , 63, the connecting line between the pivot axis 65, 67 of the associated at least one arm and the central axis of the associated higher pulley means 15, 17 extends substantially vertically. The frame 1 1 further comprises a spring 75 (figure 3a) for causing the at least one arm 61 , 63 to incline to the outer position when inactive (figures 3a), i.e. without the first engaging part 1 of the device 100 supporting a rotor blade 5. In the inner position of the arms 61 , 63, the arms are slightly inclined toward each other, so that the distance between the facing sides of the higher pulley means 15, 17 is smaller than the diameter of the base 7. The base 7, whose centre 66 is located lower than the higher pulley means 15, 17, is embraced over more than 180 degrees of its circumference by the strap 35.
The first engaging part 1 of the device 100 further comprises a drive unit 20 for rotatably driving the rotor blade 5 about its longitudinal axis, whilst the rotor blade 5 is engaged by the first engaging part 1 and by the second engaging part 3. The drive unit 20 comprises a motor 22 and a drive roller 31 for driving the strap 35 of the first engaging part 1 that is passed over four pulley means 15, 17, 27, 29.
The second engaging part 3 is configured to supportingly receive the tip 9 of the rotor blade 5. A grip clamp 55 is provided on the strap 37, in the concave part that extends between the higher pulley means 19, 21 , which grip clamp may be provided with a lining (not shown), for example of a rubbery material or in general of the material having a relatively high coefficient of friction. In the selected example, the grip clamp 55 comprises two lightly bent grip clamp parts 56, 58, which are pivotally interconnected by means of a hinge 57. In an open position of the grip clamp 55 (see figure 4), the tip 9 of the rotor blades 5 can be positioned on the lower grip clamp part 58 in the grip clamp 55, whereupon the grip clamp 55 can be closed by pivoting the upper grip clamp part 56 downward about the hinge 57. As shown in figure 5e, the two grip clamp parts 56, 58 of the grip clamp 55 can be manually interconnected by an operator and closed by means of a fastener 60. On the inner side, the grip clamp parts 56, 58 define a shape that corresponds to the cross- sectional shape of the tip 9, so that the tip 9 is accommodated in a form-locked manner in the closed position of the grip clamp 55.
The second engaging part 3 also comprises four height-adjustable legs 45, by means of which the frame 13 of the second engaging part 3 can be adjusted for height. The range of the height-adjustable legs 45 is about 100 cm, for example. In the non-adjusted compact condition, the legs 45 can be supported on the ground surface via wheels 47, so that the underside of the frame 13 is positioned 10 cm above the ground surface (not specifically shown), for example, and the second engaging part 3 can be wheeled over a ground surface relative to the first engaging part 1 , so that it is possible to adapt the distance therebetween and to align the second engaging part 3 with the first engaging part 1 . The height-adjustable legs 45 make it possible to vary the height of the pulley means 19, 21 mounted to the upper ends of the legs 45 relative to the ground surface. The height-adjustable legs 45 each comprise a dual action cylinder 90 for moving the leg parts of each leg 45 of the second engaging part 3 relative to each other (see figures 5c and 5d).
By extending the cylinders 90 from the non-adjusted compact condition, the frame 13 initially comes to be supported on the ground surface in that the wheels 47 come loose from the ground surface. Subsequently, the pulley means 19, 21 move upward. As a result, the grip clamp 55 and the tip 9 that may be present therein will also move upward, viz over a distance twice as large as the distance over which the pulley means 19, 21 move upward. At the base, this difference in height results in an angular displacement. Because the strap 35 of the first engaging part 1 is flexible, this angular displacement is compensated.
The frame 13 of the second engaging part 3 of the device 100 further comprises a support element 40 for supporting the lower grip clamp part 58 of the grip clamp 55, so that the tip 9 is easy to position in the lower grip clamp part 58 without distortion of the strap 37 with the grip clamp part 58 being possible. The support element 40 is provided with two support plates 46, 48 provided with recesses 42, between which the lower grip clamp part 58 can be position, wherein protruding pins 52 of the grip clamp 55 slip into the recesses 42, so that distortion of the grip clamp 55 on the support element is virtually impossible. The pins 52 form the shaped parts of the grip clamp 55 and the recesses 42 form the counter-shaped parts, which shaped parts and counter-shaped parts work in concert to prevent displacement of the grip clamp 55 relative to the frame 13. In addition to the lower grip clamp part 58, also the upper grip clamp part 56 is provided with protruding pins 52, which can also work in concert with the recesses 42 in case a rotor blade has rotated through 180 degrees. The initially upper grip clamp part 56 will in that case be positioned under the initially lower grip clamp part 58. It is furthermore possible to provide the device 100 with a movable support element (not shown). The movable support element may be disposed between the support plates 46, 48, for example, in which case the support element can move up and down relative to the frame 13 between a non-operative low position and an operative high position, in which operative position the support element abuts against the underside of the strap 37, and in which non-operative position the support element is clear of the strap 37.
The first engaging part 1 comprises a first weighing unit (not shown) for measuring the load on the device 100 from the weight of a rotor blade 5 that is partially supported by the first engaging means 1 , and the second engaging part 3 comprises a second weighing unit (not shown) for measuring the load on the second engaging part 3 from the weight of a rotor blade 5 that is partially supported by the second engaging means. The device 100 further comprises calculating means (not shown) for determining the mass and/or the position of the centre of gravity of the rotor blade 5 in dependence on signals from the first weighing unit and from the second weighing unit.
In a variant not shown it is possible to configure the second engaging part 3 instead of or in addition to the drive unit 20 with a further drive unit (not shown) for rotatably driving a tip 9 of the rotor blade 5 being engaged by the second engaging part 3. The further drive unit is preferably used for driving the strap 37 of the second engaging means. This optional drive unit preferably functions to support the drive unit 20 so as to thus reduce the torsional load on the rotor blade 5.
It is furthermore possible to make the support element 40 of the frame 13 of the second engaging part adjustable for height.

Claims

1 . A device for handling a wind turbine rotor blade, which rotor blade has an at least substantially round base as well as an unround tip opposite the base, the device comprising first engaging means for engaging the base of the rotor blade and second engaging means for engaging the tip of the rotor blade, which first and second engaging means are configured to rotate the rotor blade about a longitudinal axis of the rotor blade, the device further comprising drive means for rotatably driving the rotor blade about its longitudinal axis whilst the rotor blade is being engaged by the first engaging means and the second engaging means, characterised in that at least one of the first engaging means and the second engaging means comprises a frame, pulley means that are rotatably connected to the frame and a flexible elongate support element that is passed over the pulley means, wherein two higher pulley means of the pulley means are positioned in such a manner relative to each other that the support element has a concave shape between the two higher pulley means for supportingly receiving part of the rotor blade in the concave portion of the support element, and that the drive means are configured to drive the flexible elongate support element.
2. A device according to claim 1 , characterised in that elongate support element is an endless element.
3. A device according to claim 1 or 2, characterised in that the device comprises adjusting means for adjusting the two higher pulley means for height within a range of at least 30 cm.
4. A device according to any one of the preceding claims, characterised in that device comprises further adjusting means for adjusting the frame for height between a position in which the frame is supported on the ground surface and a position in which the frame is clear of the ground surface, preferably by at least 2 cm.
5. A device according to any one of the preceding claims, characterised in that the first engaging means comprise first weighing means for measuring the load on the engaging means from the weight of a rotor blade that is partially supported by the first engaging means, and that the second engaging means comprise second weighing means for measuring the load on the second engaging means from the weight of a rotor blade that is partially supported by the second engaging means, wherein the device further comprises calculating means for determining the mass and/or the position of the centre of gravity of the rotor blade in dependence on signals from the first weighing means and from the second weighing means.
6. A device according to any one of the preceding claims, characterised in that at least the first engaging means comprise a frame, pulley means that are rotatably connected to the frame and a flexible elongate support element that is passed over the pulley means, wherein two higher pulley means are positioned in such a manner relative to each other that the support element has a concave shape between the two higher pulley means for supportingly receiving part of the rotor blade in the concave portion of the support element, wherein the drive means comprise a first drive unit for driving the support element of the first engaging means.
7. A device according to claim 6, characterised in that the drive means comprise a second drive unit for rotatably driving the second engaging means or at least a part thereof that is in engaging contact with a rotor blade in use.
8. A device according to claim 6 or 7, characterised in that the device comprises at least one arm that is connected to the frame of the first engaging means for pivoting about a pivot axis between an outer position and an inner position, wherein one of the two higher pulley means is rotatably connected to the at least one arm, wherein the higher pulley means in question is located closer to the other higher pulley means in the inner position than in the outer position, and wherein the device is configured to pivot the arm from the outer position to the inner position upon or after supportingly receiving the base of the rotor blade in the concave portion of the support element.
9. A device according to claim 8, characterised in that the device comprises two arms, which are each connected to the frame of the first engaging means for pivoting about a pivot axis between respective outer and inner positions, wherein each one of the two higher pulley means is rotatably connected to one of the two arms.
10. A device according to claim 8 or 9, characterised in that the pivot axis associated with the at least one arm is located below the associated higher pulley means both in the inner position and in the outer position.
1 1 . A device according to any one of claims 8, 9 or 10, characterised in that the connecting line between the pivot axis of the associated at least one arm and the central axis of the associated higher pulley means extends vertically or is inclined at most 15 degrees in the outer position of the at least one arm.
12. A device according to any one of claims 8-1 1 , characterised in that the device comprises spring means for causing the at least one arm to incline toward the outer position.
13. A device according to any one of the preceding claims, characterised in that both the first engaging means and the second engaging means comprise a frame, pulley means that are rotatably connected to the frame and a flexible elongate support element that is passed over the pulley means, wherein two of said pulley means are positioned in such a manner relative to each other that the support element has a concave shape between the two pulley means in question for supportingly receiving part of the rotor blade in the concave portion of the support element.
14. A device according to claim 13 and claim 7, characterised in that the further drive unit is configured to drive the support element of the second engaging means.
15. A device according to claim 13 or 14, characterised in that the second engaging means comprise a clamping element which is provided on the support element of the second engaging means, at the location of the concave portion thereof, and which preferably comprises at least two clamping element parts which are movable relative to each other between an open position, in which the unround tip of a rotor blade can be placed on at least one clamping element part, and a closed position, in which the clamping element parts define a shape on the inner side thereof that corresponds to the cross-sectional shape of the tip, so that the tip is accommodated in an at least substantially form-locked manner in the clamping element.
16. A device according to claim 15, characterised in that the at least one clamping element part on which the unround tip of a rotor blade can be placed in the open position of the clamping element comprises shaped parts, and the frame is provided with counter-shaped parts, wherein the at least one clamping element part can be supported on the frame of the second engaging means, wherein the shaped parts and the counter-shaped parts work in concert to prevent displacement of the at least one clamping element part relative to the frame.
17. A device according to any one of the preceding claims, characterised in that the first engaging means and/or the second engaging means are at least substantially U-shaped.
18. A method for handling a wind turbine rotor blade, using a device according to any one of the preceding claims, , comprising the steps of
engaging the base of the rotor blade, using the first engaging means, to which end the base of the rotor blade is moved downward at least in part between two higher pulley means of the first engaging means and placed on the concave portion of the flexible elongate support element of the first engaging means, engaging the tip of the rotor blade, using the second engaging means,
driving the flexible elongate support element of the first engaging means, using the driving means, for rotating the rotor blade about its longitudinal axis.
19. A method according to claim 18, wherein, in order for the at least substantially round base of the rotor blade to be engaged by the first engaging means, the base, at least the centre of the base, of the rotor blade is moved downward between two higher pulley means of the first engaging means.
20. A method according to claim 18 or 19, wherein, in order for the base of the rotor blade to be engaged by the first engaging means, the two higher pulley means are moved toward each other while or after the base of the rotor blade is being/has been moved downward.
21 . A method according to claims 19 and 20, wherein the two higher pulley means are moved toward each other to such an extent that the facing sides of the two higher pulley means are spaced from each other by a distance smaller than the diameter of the base.
PCT/NL2017/050047 2016-01-27 2017-01-25 Device and method for handling a wind turbine rotor blade WO2017131515A1 (en)

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