NL2007019C2 - Method and vehicle for inspecting and / or treating a surface of a windmill or building, and windmill provided thereof. - Google Patents

Method and vehicle for inspecting and / or treating a surface of a windmill or building, and windmill provided thereof. Download PDF

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Publication number
NL2007019C2
NL2007019C2 NL2007019A NL2007019A NL2007019C2 NL 2007019 C2 NL2007019 C2 NL 2007019C2 NL 2007019 A NL2007019 A NL 2007019A NL 2007019 A NL2007019 A NL 2007019A NL 2007019 C2 NL2007019 C2 NL 2007019C2
Authority
NL
Netherlands
Prior art keywords
vehicle
windmill
line
coupling
treating
Prior art date
Application number
NL2007019A
Other languages
Dutch (nl)
Inventor
Hendrik Boering
Original Assignee
Magntrac 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
Priority to NL2006816 priority Critical
Priority to NL2006816 priority
Application filed by Magntrac B V filed Critical Magntrac B V
Priority to NL2007019 priority
Priority to NL2007019A priority patent/NL2007019C2/en
Application granted granted Critical
Publication of NL2007019C2 publication Critical patent/NL2007019C2/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02Cleaning by the force of jets or sprays
    • B08B3/024Cleaning by means of spray elements moving over the surface to be cleaned
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00Cleaning by methods involving the use of tools, brushes, or analogous members
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02Cleaning by the force of jets, e.g. blowing-out cavities
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62DMOTOR VEHICLES; TRAILERS
    • B62D55/00Endless track vehicles
    • B62D55/08Endless track units; Parts thereof
    • B62D55/18Tracks
    • B62D55/26Ground engaging parts or elements
    • B62D55/265Ground engaging parts or elements having magnetic or pneumatic adhesion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D80/00Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/50Maintenance or repair
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D80/00Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/50Maintenance or repair
    • F03D80/55Cleaning
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/30Wind power
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/72Wind turbines with rotation axis in wind direction

Description

METHOD AND VEHICLE FOR INSPECTING AND / OR TREATING A SURFACE OF A WINDMILL OR BUILDING, AND WINDMILL
PROVIDED THEREOF
The invention relates to a method for inspecting and / or treating a surface of a windmill or building. In particular, the method is aimed at wind turbines and buildings with a height such that aids are required to inspect and / or treat the surface thereof at height.
Methods are known from practice for inspecting and / or treating a surface of, for example, windmills. A boom lift is used for this. A platform is placed near the windmill or the building, after which a person can inspect and / or treat the surface of the structure on the platform. Such a method has the disadvantage that the installation of a platform entails considerable costs. Moreover, working at height creates a risky situation. Also, the accessibility of, for example, windmills is often difficult for an aerial platform.
An object of the invention is to counteract such drawbacks and to provide a method for inspecting and / or treating a surface of a windmill or building that is efficient and effective.
This object is achieved by the method according to the invention, which method comprises the following steps: - placing a vehicle on the surface by means of a magnetic or electromagnetic element; - coupling instruments to the vehicle for inspecting and / or treating the surface; - moving the vehicle over the surface; and 2 - inspecting and / or treating the surface with the instruments.
According to the invention, the vehicle comprises a caterpillar.
Because the vehicle is placed on the surface by means of a magnetic or electromagnetic element, it is achieved that the vehicle is held on the surface. This makes it possible to move the vehicle over a vertical surface, such as the stand of a windmill. Moreover, it is possible to place the vehicle upside down on a horizontal surface, such as a ceiling. It may be clear that the vehicle can also be mounted on sloping surfaces.
The vehicle preferably comprises a magnetic or electromagnetic element and the surface contains a material that is attracted by a magnet. For example, it is a steel stand of a windmill or a building with steel cladding. Alternatively, the vehicle is held on a non-ferromagnetic wall 20 by means of a magnetic or electromagnetic element at the rear of the surface.
The method according to the invention makes it possible to inspect and / or treat a surface of a windmill or building without the need for a working platform. This saves costs and is also safe.
A further advantage of the method according to the invention is that it can be carried out in any weather condition. When using aerial platforms for inspecting and / or treating a surface of a windmill or building, as is known in the prior art, an unsafe situation may occur for the person in the aerial platform in some weather conditions. This is prevented with the method according to the invention.
Moreover, the method according to the invention is particularly advantageous for inspecting and / or treating a surface of an offshore windmill. In the state of the art, offshore wind turbines are inspected and / or treated by means of a boat and a crane, which makes inspection or treatment an expensive affair.
For example, inspecting and / or treating a surface includes inspection, painting, sanding, or repairing. Other treatments are also possible.
In a preferred embodiment according to the invention, the treatment comprises cleaning the surface.
Cleaning in particular is a treatment that must be performed regularly. In addition to that cleaning is important for aesthetic reasons, it can also contribute to the prevention of rust formation. Moreover, wind turbines play a role in the fact that dirt, in particular oil spores, can end up in the environment. To prevent this, a windmill must be cleaned in a timely and regular manner.
A further advantage of the method according to the invention is that the vehicle can be kept on the surface between cleaning cycles. Unlike, for example, a platform that must be brought to the windmill or the building for every cleaning action, the vehicle can remain (semi) permanent. This is, incidentally, not required.
In a preferred embodiment according to the invention, the method comprises supplying a liquid. For example, the liquid is paint, water, abrasive, or cleaning agent.
By supplying a liquid to the vehicle, the surface of the building at the position of the vehicle can be treated with the liquid.
Alternatively, a gas, such as air, can also be supplied. For example, air is used to clean a surface.
Preferably, supplying a liquid 10 comprises supplying water under pressure. This ensures that the surface can be treated with a high-pressure cleaning.
According to the invention, the method comprises connecting the vehicle to a boom or winch present on the windmill or a building, such that at least part of the weight of a supply and / or discharge line is carried by the boom or winch . For example, the method comprises of hanging a pipe and / or wire coupled to the vehicle on a boom or winch of the building or the windmill, such that at least a part of its weight is supported by the boom or winch.
The conduit and / or wire can for instance be a cable, tube or hose. Many windmills and buildings are already provided with a boom or winch or another protrusion that can serve to suspend a pipe and / or wire. The invention furthermore comprises the provision of such a boom or winch or other projection to a windmill and / or building.
By guiding the required cables, hoses, pipes, tubes and / or wires through the boom or winch, at least part of the weight thereof is carried by the boom or winch.
5
In a further embodiment the method comprises of providing a line on the boom or winch provided with coupling means for coupling the supply and / or discharge conduit to the line, wherein the line is arranged such that the coupling means can be moved in the height direction.
The supply and / or discharge line is coupled with a line, the line being connected to the boom or winch. The line can be lifted and lowered, so that the place of coupling with the supply and / or discharge line can be moved up and down along the windmill or the building. This has the advantage that the distance between the suspension point of the supply and / or discharge line with respect to the ground is adjustable. First of all, this enables a simple coupling of the pipe with the line of the boom or winch. For such a coupling, the line is lowered to a height at which the pipe can easily be coupled. Secondly, the suspension point can be moved when the vehicle moves up and down over the surface. This ensures that the length of the supply and / or discharge lines can remain relatively small.
The method preferably comprises the automatic displacement of the coupling means on the basis of the displacement of the vehicle over the surface of the windmill.
This has the advantage that the vehicle and the line connected to the boom or winch do not have to be controlled separately.
For example, the boom or winch and the vehicle comprise communication means for communicating the absolute or relative position of the vehicle to the boom or winch.
6
In an advantageous embodiment of the method according to the invention, the method comprises connecting the vehicle to the windmill or the building by means of a safety line. This increases safety. Additionally, use under a wider range of weather conditions becomes possible without compromising safety.
With this measure it is achieved that in the unlikely event that the vehicle comes off the surface, the vehicle is prevented from falling completely down. In addition, the safety line can have an anti-theft function.
In a preferred embodiment of the method according to the invention, this comprises coupling the vehicle to a power supply of a windmill.
When a surface of a windmill is inspected and / or treated according to the method according to the invention, the vehicle can be coupled to a power supply of a windmill. This ensures that the vehicle can operate without the need for a separate power supply, such as a battery present on the vehicle.
Alternatively, the vehicle is provided with a battery. Alternatively or additionally, a battery of the vehicle can be charged by means of the coupling with the power supply if desired.
In a preferred embodiment, the method comprises supplying the vehicle with electrical energy at a low voltage.
The safety is increased by using a low voltage. For example, in the event of a cable break, it is prevented that the metal surface of the windmill or building is placed under a dangerous voltage.
For example, the low voltage is less than or equal to 50 V with alternating current and 120 V with direct current.
For example, the method comprises providing an inverter for converting a higher voltage to the low voltage, such as the voltage of the power supply of a windmill.
In a preferred embodiment of the method according to the invention, it comprises providing a control mechanism that realizes an automatic operation of the vehicle.
In this way an autonomous operation of the vehicle can be realized. The inspection and / or treatment can hereby be carried out without a person having to drive the vehicle. This means that once the vehicle is placed on the surface of a windmill or building and the control mechanism is activated, no or hardly any intervention by a person is necessary. For example, the control mechanism comprises a timer for carrying out a treatment or inspection at regular intervals. It is possible here to carry out a treatment autonomously as a result of an inspection, for example a cleaning.
In an embodiment of the method according to the invention, the method comprises providing a housing for the vehicle on the surface of the windmill or the building.
The housing that is provided on the surface serves as a location for stationing the vehicle. The housing preferably comprises a roof, so that the vehicle can be parked in the housing and thereby exposed to the weather as little as possible. Moreover, it is possible to provide the housing with a charging mechanism, through which a battery of the vehicle can be charged. Preferably, such a charging station which is arranged on a windmill is fed by a power supply for the windmill.
For placing the vehicle on the surface and for removing the vehicle from the surface, use can be made of a type of ramp construction, for example of wood or plastic.
The invention furthermore relates to a vehicle which can move over a surface, comprising: at least one magnetic element for holding the vehicle on the surface; and - treatment means for treating the surface, wherein the treatment means are connectable to a supply line for the supply of a fluid.
The vehicle according to the invention is preferably used in the method as described above.
For such a vehicle, the same advantages and effects as described above apply to the method.
By providing treatment means that can be coupled to a supply line for the supply of a fluid, it is achieved that liquid, such as paint or water, or gas, such as air, can be supplied to the treatment means, so that the surface on which the vehicle 30 is located can be treated with the fluid.
In a preferred embodiment, the vehicle comprises a caterpillar.
9
Preferably the caterpillar is a magnetic caterpillar, i.e. a caterpillar provided with at least one magnetic element.
Providing the vehicle with a caterpillar track 5 ensures that the vehicle has a large contact surface. This provides a firm attachment to the surface, that is, the vehicle is held firmly against the surface.
In a further preferred embodiment according to the invention the vehicle comprises an arm which is provided with a wheel, which arm extends in the longitudinal direction of the vehicle. The arm preferably extends to the rear of the vehicle, that is to say the arm preferably extends downwards, for example vertically or obliquely downwards. This effectively prevents the vehicle from tilting backwards.
Preferably, the arm has a length of at least half times the length of the vehicle, preferably at least once the length of the vehicle and more preferably at least one and a half times the length of the vehicle. It has been found that this results in a desired stability for the vehicle in practice.
In a further preferred embodiment according to the invention, the arm comprises a guide for guiding a supply line coupled to the vehicle along the arm.
When a supply line is coupled to the vehicle, for example by coupling with the treatment means, this supply line can be guided along the arm by means of the guide. This ensures that the supply line is led away from the vehicle, so that the vehicle is prevented from traveling over the line. Moreover, the supply line or the supply lines are prevented from becoming entangled.
10
The supply line can for instance comprise a supply line for a fluid, but also a wire or cable.
Finally, the invention relates to a windmill provided with a vehicle as described above.
For such a windmill the same advantages and effects apply as described above for the vehicle and / or the method.
Further advantages, features and details of the invention are elucidated on the basis of preferred exemplary embodiments thereof, with reference being made to the accompanying drawings.
Figure 1 shows a windmill provided with a vehicle according to the invention, for carrying out the method according to the invention.
Figure 2 shows a detail of Figure 1; and - Figure 3 shows the vehicle from figures 1 and 2.
Windmill 2 (Figure 1) is erected from a subsurface 4. Vehicle 6 is placed on the surface of windmill 2. Vehicle 6 is supplied with power by means of cable 8 which is coupled to power supply 12 of windmill 2. From an external supply device 14 a fluid is led to vehicle 6 via supply line 16.
Supply line 16 is herein suspended from boom or winch 18 of windmill 2, by line 17 connected to boom 18 and a coupling 19 provided at the end of line 17.
The coupling can be moved in the vertical direction by moving line 17 according to arrow A. The winch 18 and vehicle 6 comprise communication means so that the vertical position of coupling 19 can be automatically adjusted to the position of the vehicle. When vehicle 11 moves up or down, clutch 19 also moves up and down, respectively.
Moreover, a cable 20 is arranged between vehicle 6 and coupling 19, which functions as fall protection.
Vehicle 6 is operated by person 21. When vehicle 6 is not used for inspecting or treating the surface 10 of windmill 2, vehicle 6 can be parked in house 22.
Person 21 (Figure 2) operates vehicle 6 by means of control box 23 which is provided with antenna 24. Alternatively, vehicle 6 comprises a control mechanism that realizes an automatic operation of the vehicle (not shown).
Vehicle 6 comprises a caterpillar track 25 which is provided with magnetic elements 26. Because surface 10 of windmill 2 is made of a ferromagnetic material, vehicle 6 is held on surface 10.
Supply line 16 is coupled to spray head 27 of vehicle 6. Via supply line 16 a cleaning fluid 20 is guided to spray head 27 for cleaning surface 10. Vehicle 6 furthermore comprises a brush head 28 with which the surface can be waxed. Vehicle 6 comprises on its side facing the ground 4 an extending arm 30 provided with a wheel 32.
Vehicle 6 (Figure 3) comprises a camera 34 for inspecting the surface 10. Vehicle 6 is provided with a cylinder 36 for placing the spray head 27 and / or brush 28 on or off the surface. Arm 30 is provided with guides 38 for guiding cables or conduits along arm 30, as shown for cable 8 in the embodiment shown.
In the embodiment shown, vehicle 6 weighs approximately 50 kilograms. The vehicle 6 has a pulling force 12 of approximately 200 kilograms. Versions with a greater or lesser tensile force, for example 50-200 kg or more than 250 kg, and a greater or lesser weight, for example 35-100 kg, are also conceivable.
The invention is in no way limited to the above described preferred embodiments thereof.
The requested rights are determined by the following claims within the scope of which many modifications are conceivable.

Claims (14)

  1. Method for inspecting and / or treating a surface of a windmill or building, comprising the steps of: - placing a vehicle on the surface by means of a magnetic or electromagnetic element; - coupling instruments to the vehicle for inspecting and / or treating the surface; 10. moving the vehicle across the surface; and - inspecting and / or treating the surface with the instruments, the method comprising connecting the vehicle to a boom or winch present at the windmill or the building, such that at least a part of the weight of a feed - and / or discharge line is carried by the boom or winch, in which the vehicle comprises a caterpillar.
  2. The method of claim 1, wherein the treating comprises cleaning the surface.
  3. The method of claim 2, further comprising supplying a fluid. 25
  4. 4. Method as claimed in claim 1, 2 or 3, comprising of attaching a line to the boom or winch provided with coupling means for coupling the supply and / or discharge conduit to the line, wherein the line is arranged such that the coupling means can be moved in the height direction.
  5. Method as claimed in claim 4, comprising of automatically moving the coupling means on the basis of the movement of the vehicle across the surface.
  6. Method according to at least one of claims 1-5, comprising of coupling the vehicle with the windmill or the building by means of a safety line.
  7. Method according to at least one of claims 1-6, comprising coupling the vehicle to a power supply of a windmill.
  8. 8. Method according to at least one of the claims 1-7, comprising providing the vehicle with electrical energy at a low voltage.
  9. 9. Method according to at least one of claims 1-8, comprising of providing a control mechanism that realizes an automatic operation of the vehicle.
  10. 10. Vehicle for inspecting and / or treating a surface, wherein the vehicle can move over a surface, the vehicle comprising: - at least one magnetic element for keeping the vehicle on the surface; and - treatment means for treating the surface, wherein the treatment means are connectable to a supply line for the supply of a fluid.
  11. The vehicle of claim 10, comprising a caterpillar.
  12. 12. Vehicle as claimed in claim 10 or 11, wherein the vehicle comprises an arm which is provided with a wheel, which arm extends in the longitudinal direction of the vehicle. 5
  13. A vehicle according to claim 12, wherein the arm comprises a guide for guiding a supply line coupled to the vehicle along the arm.
  14. A windmill provided with a vehicle according to at least one of the claims 11-13.
NL2007019A 2011-05-19 2011-06-29 Method and vehicle for inspecting and / or treating a surface of a windmill or building, and windmill provided thereof. NL2007019C2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL2006816 2011-05-19
NL2006816 2011-05-19
NL2007019 2011-06-29
NL2007019A NL2007019C2 (en) 2011-05-19 2011-06-29 Method and vehicle for inspecting and / or treating a surface of a windmill or building, and windmill provided thereof.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL2007019A NL2007019C2 (en) 2011-05-19 2011-06-29 Method and vehicle for inspecting and / or treating a surface of a windmill or building, and windmill provided thereof.
PCT/NL2012/050355 WO2012158042A1 (en) 2011-05-19 2012-05-21 Method and vehicle for inspecting and/or treating a surface of a wind turbine or building, and wind turbine provided therewith
EP12725536.2A EP2709772A1 (en) 2011-05-19 2012-05-21 Method and vehicle for inspecting and/or treating a surface of a wind turbine or building, and wind turbine provided therewith

Publications (1)

Publication Number Publication Date
NL2007019C2 true NL2007019C2 (en) 2012-11-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
NL2007019A NL2007019C2 (en) 2011-05-19 2011-06-29 Method and vehicle for inspecting and / or treating a surface of a windmill or building, and windmill provided thereof.

Country Status (3)

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EP (1) EP2709772A1 (en)
NL (1) NL2007019C2 (en)
WO (1) WO2012158042A1 (en)

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ES2603434B1 (en) * 2015-08-17 2017-12-22 Gamesa Innovation & Technology, S.L. External cleaning machine in wind turbine towers
ES2554705B2 (en) * 2015-11-16 2016-04-05 Tratamiento Superficial Robotizado, S. L. Maintenance robot
EP3485162A1 (en) * 2016-07-12 2019-05-22 Rope Robotics APS System with art apparatus on a wire, method of its. operation, use therof and a toolkit
DK179917B1 (en) * 2017-10-02 2019-10-07 Rope Robotics Aps System with a robot on a wire, method of its operation, operation site with such system, and use thereof
US20200158094A1 (en) * 2018-11-16 2020-05-21 General Electric Company System and method for wind blade inspection, repair and upgrade
US10927818B2 (en) * 2018-11-16 2021-02-23 General Electric Company System and method for wind blade inspection, repair and upgrade

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GB2228186A (en) * 1989-01-13 1990-08-22 Neolith Chemicals Ltd Floor cleaning apparatus
WO1999007489A1 (en) * 1997-08-07 1999-02-18 Broadbent's, Inc. Remotely controlled pressurized liquid dispensing mobile unit
WO2004092577A1 (en) * 2003-04-15 2004-10-28 Vestas Wind Systems A/S Method of servicing the outer components of a wind turbine such as the wind turbine blades and the tower with a work platform and work platform
EP1886904A2 (en) * 2006-08-11 2008-02-13 Ascend RMM, S.L. Climbing cleaning robot
DE102009027680A1 (en) * 2009-07-14 2011-01-20 Voith Patent Gmbh Cleaning device for internal surfaces of rotatable hollow bodies, has tool holder, for exchangeable holding of tool, where cleaning device is inserted in inner chamber of hollow bodies
US20110088723A1 (en) * 2009-10-20 2011-04-21 Jensen dustin Wind turbine fluid application apparatus

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BE845263A (en) 1976-08-18 1976-12-16 SELF-MOVING TOWER END

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2228186A (en) * 1989-01-13 1990-08-22 Neolith Chemicals Ltd Floor cleaning apparatus
WO1999007489A1 (en) * 1997-08-07 1999-02-18 Broadbent's, Inc. Remotely controlled pressurized liquid dispensing mobile unit
WO2004092577A1 (en) * 2003-04-15 2004-10-28 Vestas Wind Systems A/S Method of servicing the outer components of a wind turbine such as the wind turbine blades and the tower with a work platform and work platform
EP1886904A2 (en) * 2006-08-11 2008-02-13 Ascend RMM, S.L. Climbing cleaning robot
DE102009027680A1 (en) * 2009-07-14 2011-01-20 Voith Patent Gmbh Cleaning device for internal surfaces of rotatable hollow bodies, has tool holder, for exchangeable holding of tool, where cleaning device is inserted in inner chamber of hollow bodies
US20110088723A1 (en) * 2009-10-20 2011-04-21 Jensen dustin Wind turbine fluid application apparatus

Also Published As

Publication number Publication date
EP2709772A1 (en) 2014-03-26
WO2012158042A1 (en) 2012-11-22

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Effective date: 20190701