WO2009128708A2 - Method and lift construction for lifting and lowering a blade of a windmill - Google Patents

Method and lift construction for lifting and lowering a blade of a windmill Download PDF

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Publication number
WO2009128708A2
WO2009128708A2 PCT/NL2009/050135 NL2009050135W WO2009128708A2 WO 2009128708 A2 WO2009128708 A2 WO 2009128708A2 NL 2009050135 W NL2009050135 W NL 2009050135W WO 2009128708 A2 WO2009128708 A2 WO 2009128708A2
Authority
WO
WIPO (PCT)
Prior art keywords
yoke
windmill
blade
cone
lift construction
Prior art date
Application number
PCT/NL2009/050135
Other languages
French (fr)
Other versions
WO2009128708A3 (en
Inventor
Martinus Marianus Maria Van Berlo
Adrianus Gerardus Maria Versteeg
Original Assignee
Dutch Heavy Lift Concepts 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 Dutch Heavy Lift Concepts B.V. filed Critical Dutch Heavy Lift Concepts B.V.
Priority to DK09732534.4T priority Critical patent/DK2279345T5/en
Priority to AU2009236783A priority patent/AU2009236783B2/en
Priority to US12/988,272 priority patent/US8651462B2/en
Priority to ES09732534.4T priority patent/ES2451342T3/en
Priority to CA2721676A priority patent/CA2721676C/en
Priority to EP09732534.4A priority patent/EP2279345B1/en
Publication of WO2009128708A2 publication Critical patent/WO2009128708A2/en
Publication of WO2009128708A3 publication Critical patent/WO2009128708A3/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
    • F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
    • F03D13/10—Assembly of wind motors; Arrangements for erecting wind motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
    • B66C23/20—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes with supporting couples provided by walls of buildings or like structures
    • B66C23/207—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes with supporting couples provided by walls of buildings or like structures with supporting couples provided by wind turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2230/00—Manufacture
    • F05B2230/60—Assembly methods
    • F05B2230/61—Assembly methods using auxiliary equipment for lifting or holding
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/49318—Repairing or disassembling
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/4932—Turbomachine making
    • Y10T29/49321—Assembling individual fluid flow interacting members, e.g., blades, vanes, buckets, on rotary support member
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49998—Work holding

Definitions

  • the invention relates to a method and lift construction for lifting and lowering a blade of a windmill to and from its mounted position at a rotatable cone of the windmill.
  • the blades of windmills are long and heavy.
  • a typical windmill blade is approximately 43 metres long and weighs between 4000 kg and 50.000 kg. Due to its operation a windmill's blade suffers resonances due to the repeated compression of air near to the windmill's standard. Such repeating stresses may eventually result in fatigue-cracks, which are detrimental to the structural reliability of the windmill. As a consequence inspections are carried out so as to establish whether or not a windmill blade must be replaced or repaired.
  • a lift construction comprising:
  • a second yoke is mounted in the windmill's cone, wherein the first yoke and the second yoke are provided with positioning means and hoisting means, and in that • when the blade is near to the windmill's cone, the positioning means and hoisting means of the yokes carry out a concerted operation so as to move the windmill's blade towards or away from the cone in a line that substantially coincides with the blade's orientation when in the mounted position, and that
  • the mounting or dismounting of a windmill's blade can simply be carried out by employing said first yoke mounted at the inside of the windmill's blade and said second yoke mounted in the cone of the windmill.
  • the first yoke and the second yoke having cooperating hoisting means that are provided at the ends of the yokes which - in use - are distant from the windmill's standard.
  • first yoke and second yoke have cooperating positioning or pushing means near to the ends of the yokes which - in use - are closest to the windmill's standard for at least maintaining a predefined alignment and/or distance of the ends of the yokes.
  • An effective way of carrying out the positioning means that are provided on the first yoke and the second yoke is that the first yoke has a receptacle and the second yoke has an actuator or vice versa, wherein the actuator has an end that fits in said receptacle, such that upon activation of the actuator a predefined pressure is applied to the receptacle so as to balance the blade of the windmill in a predefined alignment.
  • the blade of the windmill occupies a position with respect to the cone of the windmill that allows it to be mounted or dis- mounted from the cone.
  • the ease of working with the lift construction according to the invention is promoted by arranging that the first yoke comprises at both its ends pins, which in use point at the blade's inside for mounting the first yoke to the blade. This is particularly true in case that the pins are placed at a position so as to be able to cooperate with pin-holes in the blade that are intended for connecting the blade to the windmill's cone.
  • the second yoke is provided with hoisting means that are connectable to the first yoke or a part thereof, in particular to a hoisting means or pad eye of the first yoke.
  • the ease of operation of the lift construction in accordance with the invention is particularly supported by arranging that the hoisting means of the second yoke are (manually) adjustable .
  • the lift construction of the invention comprises a guiding arm for a lifting cable, which arm is connectable to the second yoke.
  • the lifting cable it is possible to simply lower or lift the windmill's blade vertically, for which purpose it is desirable that the lifting cable is connectable to the first yoke or a part thereof, in particular to a hoisting means or pad eye provided on the first yoke.
  • the guiding arm In order to secure that the guiding arm operates securely and safely it is desirable that the guiding arm is sup- ported, for instance by connecting chains that connect the arm to the windmill's cone or a part thereof.
  • the invention is further embodied in the separate yokes as described hereinbefore as part of the lift construction of the invention.
  • a yoke that is particularly used for mounting at the inside of the windmill's blade has opposite ends that in use face the inside of the blade.
  • these ends are movable to and from each other in order to easily accommodate to the diameter of the blade which is to be mounted or dismounted.
  • Such a yoke is preferably provided with at least first hoisting means near an end that in use faces an inside of a windmill's blade and furthermore it is preferred that at an end opposite to the end where the hoisting means are located, means are provided that are arranged to cooperate with further means of another yoke so as to press both yokes apart.
  • the yoke of the invention is carried out such that it comprises at both its ends pins, which in use are for mounting to a blade of a windmill.
  • the yoke is arranged such that the pins are placed at a position so as to be able to cooperation with pin-holes in the blade that are intended for connecting the blade to the windmill's cone.
  • the invention shall hereinafter be further elucidated with reference to an exemplary embodiment of the lift construc- tion and method for lifting and lowering a windmill's blade in accordance with the invention and with reference to the drawing.
  • - Fig. 1 shows a first yoke forming part of the lift construction of the invention
  • - Fig. 2 shows a second yoke forming part of the lift construction in accordance with the invention
  • FIG. 3 shows a guiding arm forming part of the lift construction in one embodiment of the invention.
  • FIG. 4-9 shows an operational sequence carried out in a method for dismounting a windmill's blade from a windmill's cone employing the lift construction according to the embodiment of the invention employing the guiding arm shown in Fig. 3.
  • a first yoke 1 is shown which is mountable on the inside of a windmill's blade 2 such as shown in Figs. 4-9.
  • FIG. 1 clearly shows the first yoke 1 comprises at both its ends 3, 4 pins 5 that in use point at the inside of the blade 2 so as to be able to mount the first yoke 1 to the blade
  • pins 5 are placed at a position so as to be able to cooperate with pinholes 6 (see Fig. 7) that are circumferentially provided at an end of the windmill's blade 2; see for instance Fig. 7 and Fig. 8 showing one such pinhole.
  • pinholes 6 are normally used for connecting the blade 2 to the windmill's cone 7.
  • Fig. 2 shows a second yoke 8 of the lift construction of the invention, which is mountable in the cone 7 of the wind- mill.
  • This second yoke 8 is provided with hoisting means 9', 9 ⁇ 'r I that are connectable to the first yoke 1 shown in Fig. 1 or a part thereof, in particular to a sheave block 10 or pad eye provided on the first yoke 1.
  • the hoisting means 9', 9'' preferably include manually adjustable hoisting means 9'' as shown in Fig. 2.
  • the said sheave block 10 or pad eye of the first yoke 1 and the hoisting means in the form of winch 9' ' of the second yoke 8 are provided as Fig. 1 and Fig.
  • FIG. 1 and Fig. 2 respectively show that the first yoke 1 and the second yoke 8 comprise positioning means 11, 12 that cooperate with each other and are placed near to the ends of the yokes 1,8, which in use are closest to the windmill standard (not shown) . That means that these positioning or pushing means 11, 12 are furthest away from the front end of the windmill's cone 7 as clearly shown in Figs. 4-9.
  • these positioning means 11, 12 of the first yoke 1 and the second yoke 8 it is possible to maintain a predefined alignment and distance between these ends of the yokes 1, 8 and consequently maintain the blade 2 in a predefined inclination with respect to the windmill's cone 7, also when the bolts are disconnected that are used to secure the blade 2 to the cone 7 of the windmill.
  • Fig. 1 clearly shows that the first yoke 1 may advantageously be provided with a receptacle 11 and Fig. 2 shows that the second yoke 8 may be provided with an actuator 12 - or vice versa - which actuator 12 has an end that accurately fits in the receptacle 11 of the yoke 1 such that upon activation of the actuator 12 a predefined pressure may be applied to the receptacle 11 so as to balance the blade 2 of the windmill in the desired predefined angle and position. In this predefined angle and position the blade 2 of the windmill occupies an alignment with respect to the cone 7 of the windmill that allows it to be easily mounted or dismounted therefrom.
  • the lift construction of the invention also preferably comprises a guiding arm 13 as shown in Fig. 3.
  • a lifting cable 14 may be guided which is to be connected to the first yoke 1 or a part thereof, in particular to a sheave block 10 or pad eye provided on the first yoke 1.
  • the guiding arm 13 is supported, for instance by connecting chains 15 as is shown in Fig. 3 to connect the arm 13 to the windmill cone 7.
  • Fig. 4 the first yoke 1 has been mounted to the inside of the blade 2. This can easily be done by taking the yoke 1 up by a service hoist of the nacelle or through the inside of the windmill through the (not shown) standard to the cone 7, which cone gives ample room for persons and the lift construction of the invention.
  • the second yoke 8 is mounted to the windmill's cone 7 and in accordance with the invention the first yoke 1 and the second yoke 8 are provided with positioning means 11, 12 and hoisting means 10, 9' .
  • the positioning means 11, 12 and hoisting means 10, 9' of the yokes 1, 8 carryout a concerted operation so as to move the windmill's blade 2 away from the cone 7 in a line that substantially coincides with the blade's orientation when in the mounted position as shown in Fig. 4.
  • This line of movement corresponds to the body axis indicated with centre-line 16.
  • Fig. 7 it is shown that the distance between the blade 2 and the cone 7 of the windmill is further increased by substantially vertically lowering the blade 2 from the cone 7. This gives room for introducing a helpline 17 into the area of the cone 7 which serves to subsequently introduce a guiding arm 13 for a lifting cable 14 into the cone 7.
  • Fig. 8 shows that this guiding arm 13 is connected to the second yoke 8 whereafter subsequently the lifting cable 14 is moved through and down to the hoisting means 10 or pad eye of the yoke 1 that connects to the blade 2.
  • Fig. 9 it is clearly shown that indeed the lifting cable 14 connects to the hoisting means 10 of the first yoke 1. This allows that by simply operating from the ground the blade 2 may be fur- ther lowered so as to receive it eventually at the ground for further handling.

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

Abstract

The invention relates to a lift construction for lifting and lowering a blade of a windmill to and from its mounted position at a rotatable cone of the windmill, wherein it comprises: -a first yoke mountable at the inside of the blade -a second yoke mountable in the cone of the windmill, wherein the first yoke and the second yoke are arranged to cooperate.

Description

Method and lift construction for lifting and lowering a blade of a windmill
The invention relates to a method and lift construction for lifting and lowering a blade of a windmill to and from its mounted position at a rotatable cone of the windmill.
The blades of windmills are long and heavy. A typical windmill blade is approximately 43 metres long and weighs between 4000 kg and 50.000 kg. Due to its operation a windmill's blade suffers resonances due to the repeated compression of air near to the windmill's standard. Such repeating stresses may eventually result in fatigue-cracks, which are detrimental to the structural reliability of the windmill. As a consequence inspections are carried out so as to establish whether or not a windmill blade must be replaced or repaired.
Any replacement of windmill blades is a costly affair, which is partly due to the heavy load of the windmill blades and the altitude at which the blades are mounted to the windmill's cone. Specifically the fact that windmill's are normally applied at places where no structural roads are available causes that specific measures are required, such as the application of temporarily road constructions, to make it possible that heavy duty cranes that may carry loads at high altitudes can be placed near to the windmill of which the blades have to be replaced.
It is an object of the invention to make the replacement of windmill blades more easy without necessity to employ heavy cranes, and to reduce the costs that are associated with any such replacement or in general with the dismounting or the mounting of the blades of a windmill.
In order to be able to meet the objectives of the invention a method and lift construction for lifting and lowering a blade of a windmill is proposed in accordance with one or more of the appended claims.
In a first aspect of the invention a lift construction is proposed comprising:
- a first yoke mountable at the inside of the blade
- a second yoke mountable in the cone of the windmill, wherein the first yoke and the second yoke are arranged to cooperate.
With the lift construction of the invention it is possible that - a first yoke is mounted to the blade's inside
- a second yoke is mounted in the windmill's cone, wherein the first yoke and the second yoke are provided with positioning means and hoisting means, and in that • when the blade is near to the windmill's cone, the positioning means and hoisting means of the yokes carry out a concerted operation so as to move the windmill's blade towards or away from the cone in a line that substantially coincides with the blade's orientation when in the mounted position, and that
• when the blade is beyond a predefined distance with respect to the windmill's cone, the blade is lifted or lowered substantially vertically.
Accordingly, with the invention it is no longer re- quired to employ heavy duty cranes which are capable to operate at high altitudes. Instead, the mounting or dismounting of a windmill's blade can simply be carried out by employing said first yoke mounted at the inside of the windmill's blade and said second yoke mounted in the cone of the windmill. As already indicated, for effectively carrying out the mounting or dismounting of a windmill's blade it is preferable that the first yoke and the second yoke having cooperating hoisting means that are provided at the ends of the yokes which - in use - are distant from the windmill's standard. Likewise, it is preferable that the first yoke and second yoke have cooperating positioning or pushing means near to the ends of the yokes which - in use - are closest to the windmill's standard for at least maintaining a predefined alignment and/or distance of the ends of the yokes. An effective way of carrying out the positioning means that are provided on the first yoke and the second yoke is that the first yoke has a receptacle and the second yoke has an actuator or vice versa, wherein the actuator has an end that fits in said receptacle, such that upon activation of the actuator a predefined pressure is applied to the receptacle so as to balance the blade of the windmill in a predefined alignment. Accordingly, it is possible that with said predefined alignment the blade of the windmill occupies a position with respect to the cone of the windmill that allows it to be mounted or dis- mounted from the cone. The ease of working with the lift construction according to the invention is promoted by arranging that the first yoke comprises at both its ends pins, which in use point at the blade's inside for mounting the first yoke to the blade. This is particularly true in case that the pins are placed at a position so as to be able to cooperate with pin-holes in the blade that are intended for connecting the blade to the windmill's cone.
Beneficially, the second yoke is provided with hoisting means that are connectable to the first yoke or a part thereof, in particular to a hoisting means or pad eye of the first yoke. The ease of operation of the lift construction in accordance with the invention is particularly supported by arranging that the hoisting means of the second yoke are (manually) adjustable . In a certain embodiment it is beneficial that the lift construction of the invention comprises a guiding arm for a lifting cable, which arm is connectable to the second yoke. With this lifting cable it is possible to simply lower or lift the windmill's blade vertically, for which purpose it is desirable that the lifting cable is connectable to the first yoke or a part thereof, in particular to a hoisting means or pad eye provided on the first yoke.
In order to secure that the guiding arm operates securely and safely it is desirable that the guiding arm is sup- ported, for instance by connecting chains that connect the arm to the windmill's cone or a part thereof.
The invention is further embodied in the separate yokes as described hereinbefore as part of the lift construction of the invention. Such a yoke that is particularly used for mounting at the inside of the windmill's blade has opposite ends that in use face the inside of the blade. Advantageously, these ends are movable to and from each other in order to easily accommodate to the diameter of the blade which is to be mounted or dismounted. Such a yoke is preferably provided with at least first hoisting means near an end that in use faces an inside of a windmill's blade and furthermore it is preferred that at an end opposite to the end where the hoisting means are located, means are provided that are arranged to cooperate with further means of another yoke so as to press both yokes apart. Advantageously the yoke of the invention is carried out such that it comprises at both its ends pins, which in use are for mounting to a blade of a windmill.
It is further preferable that the yoke is arranged such that the pins are placed at a position so as to be able to cooperation with pin-holes in the blade that are intended for connecting the blade to the windmill's cone.
The invention shall hereinafter be further elucidated with reference to an exemplary embodiment of the lift construc- tion and method for lifting and lowering a windmill's blade in accordance with the invention and with reference to the drawing.
In the drawing:
- Fig. 1 shows a first yoke forming part of the lift construction of the invention; - Fig. 2 shows a second yoke forming part of the lift construction in accordance with the invention;
- Fig. 3 shows a guiding arm forming part of the lift construction in one embodiment of the invention and;
- Figs. 4-9 shows an operational sequence carried out in a method for dismounting a windmill's blade from a windmill's cone employing the lift construction according to the embodiment of the invention employing the guiding arm shown in Fig. 3.
Wherever in the figures the same reference numerals are applied, these numerals refer to the same parts. Making reference first to Fig. 1, a first yoke 1 is shown which is mountable on the inside of a windmill's blade 2 such as shown in Figs. 4-9.
As Fig. 1 clearly shows the first yoke 1 comprises at both its ends 3, 4 pins 5 that in use point at the inside of the blade 2 so as to be able to mount the first yoke 1 to the blade
2.
To this end the pins 5 are placed at a position so as to be able to cooperate with pinholes 6 (see Fig. 7) that are circumferentially provided at an end of the windmill's blade 2; see for instance Fig. 7 and Fig. 8 showing one such pinhole.
These pinholes 6 are normally used for connecting the blade 2 to the windmill's cone 7.
Fig. 2 shows a second yoke 8 of the lift construction of the invention, which is mountable in the cone 7 of the wind- mill. This second yoke 8 is provided with hoisting means 9', 9 \'r I that are connectable to the first yoke 1 shown in Fig. 1 or a part thereof, in particular to a sheave block 10 or pad eye provided on the first yoke 1. The hoisting means 9', 9'' preferably include manually adjustable hoisting means 9'' as shown in Fig. 2. The said sheave block 10 or pad eye of the first yoke 1 and the hoisting means in the form of winch 9' ' of the second yoke 8 are provided as Fig. 1 and Fig. 2 respectively show, at the ends of the yokes 1, 8, which - as Figs. 4-9 clearly show - in use are distant from the windmills standard (not shown) . Fig. 1 and Fig. 2 respectively also show that the first yoke 1 and the second yoke 8 comprise positioning means 11, 12 that cooperate with each other and are placed near to the ends of the yokes 1,8, which in use are closest to the windmill standard (not shown) . That means that these positioning or pushing means 11, 12 are furthest away from the front end of the windmill's cone 7 as clearly shown in Figs. 4-9. By the operation of these positioning means 11, 12 of the first yoke 1 and the second yoke 8 it is possible to maintain a predefined alignment and distance between these ends of the yokes 1, 8 and consequently maintain the blade 2 in a predefined inclination with respect to the windmill's cone 7, also when the bolts are disconnected that are used to secure the blade 2 to the cone 7 of the windmill.
Fig. 1 clearly shows that the first yoke 1 may advantageously be provided with a receptacle 11 and Fig. 2 shows that the second yoke 8 may be provided with an actuator 12 - or vice versa - which actuator 12 has an end that accurately fits in the receptacle 11 of the yoke 1 such that upon activation of the actuator 12 a predefined pressure may be applied to the receptacle 11 so as to balance the blade 2 of the windmill in the desired predefined angle and position. In this predefined angle and position the blade 2 of the windmill occupies an alignment with respect to the cone 7 of the windmill that allows it to be easily mounted or dismounted therefrom.
In a certain embodiment the lift construction of the invention also preferably comprises a guiding arm 13 as shown in Fig. 3. With this guiding arm 13 a lifting cable 14 may be guided which is to be connected to the first yoke 1 or a part thereof, in particular to a sheave block 10 or pad eye provided on the first yoke 1. This is shown in Fig. 9. It is preferable that the guiding arm 13 is supported, for instance by connecting chains 15 as is shown in Fig. 3 to connect the arm 13 to the windmill cone 7.
The method and the lift construction of the invention for mounting or dismounting a windmill's blade 2 to a cone 7 of a windmill may now effectively be elucidated with reference to Figs. 4-9 wherein as an example the dismounting of the blade 7 from the cone 7 is shown schematically.
In Fig. 4 the first yoke 1 has been mounted to the inside of the blade 2. This can easily be done by taking the yoke 1 up by a service hoist of the nacelle or through the inside of the windmill through the (not shown) standard to the cone 7, which cone gives ample room for persons and the lift construction of the invention.
Likewise the second yoke 8 is mounted to the windmill's cone 7 and in accordance with the invention the first yoke 1 and the second yoke 8 are provided with positioning means 11, 12 and hoisting means 10, 9' .
Following the mounting of the first yoke 1 and second yoke 8 as shown in Fig. 4, then initially when the blade 2 is still near to the windmill's cone 7 - as shown in Fig. 5 - the positioning means 11, 12 and hoisting means 10, 9' of the yokes 1, 8 carryout a concerted operation so as to move the windmill's blade 2 away from the cone 7 in a line that substantially coincides with the blade's orientation when in the mounted position as shown in Fig. 4. This line of movement corresponds to the body axis indicated with centre-line 16.
When the blade 2 is beyond a predefined distance with respect to the windmill's cone 7 the concerted operation of the positioning means 11, 12 and hoisting means 10, 9' of the yokes 1, 8 may be interrupted and the hoisting means 10, 9' may then remain the only means of connection between the first yoke 1 connecting to the blade 2 and the second yoke 8 connecting to the cone 7 of the windmill. This is shown in Fig. 6.
In Fig. 7 it is shown that the distance between the blade 2 and the cone 7 of the windmill is further increased by substantially vertically lowering the blade 2 from the cone 7. This gives room for introducing a helpline 17 into the area of the cone 7 which serves to subsequently introduce a guiding arm 13 for a lifting cable 14 into the cone 7. Fig. 8 shows that this guiding arm 13 is connected to the second yoke 8 whereafter subsequently the lifting cable 14 is moved through and down to the hoisting means 10 or pad eye of the yoke 1 that connects to the blade 2. At the stage when this is completed as shown in Fig. 9 it is clearly shown that indeed the lifting cable 14 connects to the hoisting means 10 of the first yoke 1. This allows that by simply operating from the ground the blade 2 may be fur- ther lowered so as to receive it eventually at the ground for further handling.
The method for raising a blade 2 and mounting it to the cone 7 of a windmill operates vice versa and requires no further elucidation . The above given exemplary embodiment of the method and lifting construction of the invention is intended solely for illustrative purposes without necessarily restricting the scope of protection of the appended claims to the shown embodiment. The protective scope that merits the invention is entirely deter- mined by the appended claims whereby if necessary any ambiguity of these claims may be explained with reference to the above given elucidation with reference to the exemplary embodiment.

Claims

1. Lift construction for lifting and lowering a blade (2) of a windmill to and from its mounted position at a ro- tatable cone (7) of the windmill, characterized in that it comprises : - a first yoke (1) mountable at the inside of the blade
(9)
- a second yoke (8) mountable in the cone (7) of the windmill, wherein the first yoke (1) and the second yoke (8) are arranged to cooperate.
2. Lift construction according to claim 1, characterized in that the first yoke (1) and the second yoke (8) have cooperating hoisting means (10, 9') that are provided at the ends of the yokes which - in use - are distant from the windmill's standard.
3. Lift construction according to claim 1 or claim 2, characterized in that the first yoke (1) and second yoke (8) have cooperating positioning means (11, 12) near to the ends of the yokes (1,8) which - in use - are closest to the windmill's standard for at least maintaining a predefined alignment and/or distance between said ends of the yokes (1,8) .
4. Lift construction according to anyone of claims 1-3, characterized in that the first yoke (1) has a receptacle (11) and the second yoke (8) has an actuator (12) or vice versa, which actuator (12) has an end that fits in said receptacle
(11), such that upon activation of the actuator (12) a predefined pressure is applied to the receptacle (11) so as to balance the blade (2) of the windmill at a predefined angle and/or position .
5. Lift construction according to claim 4, characterized in that in the predefined angle and/or position the blade (2) of the windmill occupies a position with respect to the cone (7) of the windmill that allows it to be mounted or dismounted from the cone (7) .
6. Lift construction according to any one of claims
1-5, characterized in that the first yoke (1) comprises at both its ends (3, 4) pins (5), that in use point at the blade's inside for mounting the first yoke (1) to the blade (2) .
7. Lift construction according to claim 6, characterized in that the pins (5) are placed at a position so as to be able to cooperate with pin-holes (6) in the blade (2) that are intended for connecting the blade (2) to the windmill's cone (7) .
8. Lift construction according to any one of the previous claims, characterized in that the second yoke (8) is provided with hoisting means (9', 9'') that are connectable to the first yoke (1) or a part thereof, in particular to hoisting means (10) or a pad eye of the first yoke (1) .
9. Lift construction according to claim 8, characterized in that the hoisting means (9'') of the second yoke (8) are adjustable .
10. Lift construction according to any one of the pre- ceding claims, characterized in that it comprises:
- a guiding arm (13) for a lifting cable (14), which arm is connectable to the second yoke (8) .
11. Lift construction according to claim 10, characterized in that the lifting cable (14) is connectable to the first yoke (1) or a part thereof, in particular to hoisting means (10) or a pad eye provided on the first yoke (1) .
12. Lift construction according to claim 10 or 11, characterized in that the guiding arm (13) is supported, preferably by connecting chains (15) that connect the arm (13) to the windmill's cone (7) or a part thereof.
13. Yoke (1) for mounting at the inside of a windmill's blade (2), having opposite ends (3,4) that in use face said inside of the blade (2), and which ends (3,4) are movable to and from each other.
14. Yoke (1) according to claim 13, characterized in that it has at least one hoisting means (10) or pad eye near an end (4) that in use faces an inside of a windmill's blade (2) .
15. Yoke (1) according to claim 13 or 14, characterized in that at an end (3) opposite to the end (4) where a hoisting means (10) or a pad eye is located, means (11) are provided that are arranged to cooperate with further means (12) of another yoke (8) so as to press both yokes (1,8) apart.
16. Yoke (1) according to anyone of claims 13-15, characterized in that it comprises at both its ends (3,4) pins (5), that in use are for mounting to a blade (2) of a windmill.
17. Yoke (1) according to claim 16, characterized in that the pins (5) are placed at a position so as to be able to cooperate with pin-holes (6) in the blade (2) that are intended for connecting the blade (2) to the windmill's cone (7) .
18. Yoke (8) for mounting in the cone (7) of a windmill, provided with hoisting means (9', 9'') for connecting to hoisting means (10) or a pad eye of another yoke (1) that is mounted in an inside of a windmill's blade (2) .
19. Method for mounting or dismounting a windmill's blade (2) to a cone (7) of a windmill characterized in that:
- a first yoke (1) is mounted to the blade's inside
- a second yoke (8) is mounted in the windmill's cone (7), wherein the first yoke (1) and the second yoke (8) are provided with positioning means (11, 12) and hoisting means (10, 9' ) , and in that
• when the blade (2) is near to the windmill's cone (7), the positioning means (11, 12) and hoisting means (10, 9') of the yokes (1, 8) carry out a concerted operation so as to move the windmill's blade (2) towards or away from the cone (7) in a line that substantially coincides with the blade's orientation when in the mounted position, and that
• when the blade (2) is beyond a predefined distance with respect to the windmill's cone (7), the blade (2) is lifted or lowered substantially vertically.
PCT/NL2009/050135 2008-04-16 2009-03-23 Method and lift construction for lifting and lowering a blade of a windmill WO2009128708A2 (en)

Priority Applications (6)

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DK09732534.4T DK2279345T5 (en) 2008-04-16 2009-03-23 Method and lifting unit for raising and lowering a wind turbine blade
AU2009236783A AU2009236783B2 (en) 2008-04-16 2009-03-23 Method and lift construction for lifting and lowering a blade of a windmill
US12/988,272 US8651462B2 (en) 2008-04-16 2009-03-23 Method and lift construction for lifting and lowering a blade of a windmill
ES09732534.4T ES2451342T3 (en) 2008-04-16 2009-03-23 Lift method and construction for the assembly and disassembly of blades of a wind turbine
CA2721676A CA2721676C (en) 2008-04-16 2009-03-23 Method and lift construction for lifting and lowering a blade of a windmill
EP09732534.4A EP2279345B1 (en) 2008-04-16 2009-03-23 Method and lift construction for lifting and lowering a blade of a windmill

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NL1035301A NL1035301C1 (en) 2008-04-16 2008-04-16 Lifting and lowering method for e.g. wind turbine blade, comprises modular hoist mounted on rotor casing with aid of support and pulley blocks
NL1035301 2008-04-16

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WO2009128708A3 WO2009128708A3 (en) 2010-05-14

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AU2009236783B2 (en) 2013-04-04
DK2279345T5 (en) 2014-03-31
DK2279345T3 (en) 2014-03-17
NL1035301C1 (en) 2008-06-04
US8651462B2 (en) 2014-02-18
AU2009236783A1 (en) 2009-10-22
US20110042632A1 (en) 2011-02-24
EP2279345B1 (en) 2013-12-11
CA2721676C (en) 2014-07-29
ES2451342T3 (en) 2014-03-26
WO2009128708A3 (en) 2010-05-14
CA2721676A1 (en) 2009-10-22
EP2279345A2 (en) 2011-02-02

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