DESC:
FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003

COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. Title of the Invention
A PORTABLE CRANE SYSTEM FOR SERVICING COMPONENTS OF NACELLE OF A WIND TURBINE
2. Applicant(s)
Name Nationality Address
WINDCARE INDIA PVT. LTD. Indian NO : 3/241-A, FOUR ROAD, THIRUMALAI NAGAR, GUDIMANGALAM (PO), UDUMALPET, TIRUPUR DISTRICT – 642201,
TAMILNADU, INDIA
3. Preamble to the description

The following specification particularly describes the invention and the manner in which it is to be performed

FIELD
The present disclosure relates to the field of portable crane systems for servicing components of nacelle of a wind turbine.
BACKGROUND
The background information herein below relates to the present disclosure but is not necessarily prior art.
Generally, a wind turbine includes a tower, a nacelle, and a blade which is coupled to the front end of the nacelle and electricity generation system. Wind turbines generate electricity from wind and are sometimes located at remote locations having undulating land contour. The components of wind turbines such as nacelle and its internal components are required to be regularly serviced for proper functioning. Typically, during maintenance activity the components of the nacelle such as a generator, a gearbox, a transformer and cabinet panel need to be removed and again installed back after servicing. Conventional method of maintenance involves use of a large crane for removal and installation of the components from the nacelle to ground.
However, the conventional method of using large cranes has certain disadvantages while de-erecting and re-erecting a component. There are many factors that affect the working of the large cranes such as wearing of its components, wind, and varying weather conditions. This increases the risk of a work site accident. Further, hydraulics in the crane is affected by winds having temperatures below 10 degrees Fahrenheit. Other factors include rain, snow and foggy weather which cause water to seep into the brakes or clutch of the crane, making safe operations potentially impossible. These factors reduce a crane's lifting capacity, as well as its stability on the ground, especially on undulating terrains. Economical and versatile crane concepts reach their limits as the height of the wind turbine tower exceeds 140-meter. The mobilization and set up costs rise exponentially as per the crane size. The number of trucks required to transport the crane and its parts depends on the crane model and configuration, and may require several trips to move all components to the site, thereby further adding to the maintenance cost.
Therefore, there is felt a need of a crane system that is portable and that alleviates the aforementioned drawbacks of the conventional arrangements.
OBJECTS
Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows:
An object of the present disclosure is to provide a portable crane system for servicing components of nacelle.
Another object of present disclosure is to provide a crane system for removal and installation of components from a nacelle to ground.
Another object of the present disclosure is to provide a crane system that facilitates effective removal and installation of components from nacelle.
Still another object of the present disclosure is to provide a crane system that can be removable fixed to a wind turbine tower.
Yet another object of the present disclosure is to provide a crane system that can easily move in horizontal direction with in the nacelle at a desired position while removal and installation of components there from.
Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.
SUMMARY
The present disclosure envisages a portable crane system for servicing components of nacelle of a wind turbine. The crane system is configured to be fitted on a nacelle frame of the wind turbine. The crane system comprises a crane main bed, a column post, a crane boom, a lifting jig, a fixed pulley, a movable pulley, and a traction hoist. The crane main bed removably fixed to the nacelle frame. The column post vertically extending from the crane bed. The crane boom pivotally coupled with free end of the column post. The lifting jig is fixed onto a component to be serviced. The fixed pulley operatively disposed at operative end portion of the crane boom. The movable pulley operatively disposed on the lifting jig in line with the fixed pulley. The traction hoist is fixed on the crane boom. The hoist is configured to provide a lifting line to pass through the fixed pulley on to the movable pulley and back to the fixed pulley. The traction hoist and the crane boom configured to facilitate rotation of the boom horizontally in a predetermined position to operate and to position the nacelle crane hoisting point at a predetermined position inside and outside of the nacelle. The hoist and the crane boom further configured to lift component and lowering of the component from the nacelle to ground to service the component.
In an embodiment, the system includes a hydraulic cylinder operatively coupled to the crane boom and is configured to allow crane boom to act as a cantilever and facilitate translational and swinging movements in vertical and/or horizontal planes or a combination of such movements thereof to lift and lower the component.
In an embodiment, the crane boom is telescopic type configured to be extendable by means of the hydraulic cylinder.
In an embodiment, the lifting jig includes at least two end beams, at least two center beams, and at least two pulley lock beams. The center beams are coupled between the two end beams and being perpendicular to the end beams. The two pulley lock beams are coupled perpendicular between the center beams to hold the movable pulley.
In an embodiment, the traction hoist is configured to drive in or drive out the lifting line while lifting or lowering the components.
In an embodiment, the system includes a crane front stool and a crane back stool mounted on the frame, thereby allowing the crane main bed to be mounted on the crane front stool and the crane back stool.
In an embodiment, the crane front stool and the crane back counter stool are supported by a base stool. In an embodiment, the crane back stool is assembled on a crane back counter stool using fasteners.
In an embodiment, the system includes a first and second lifting frames configured to be temporarily disposed in the nacelle. Each of the first and second lifting frames is configured to allow assembling of a first lifting post, a second lifting post, a third lifting post and a fourth lifting post.
In an embodiment, the first and the second lifting frames are configured to lift the crane front stool, the crane back counter stool, the base stool, the crane main bed, the column post, the crane boom, the movable pulley, and the a traction hoist from ground to nacelle.
In an embodiment, the end portion of the crane main bed includes a C-shaft U clamp configured to hold the main rotor shaft of the turbine, the U clamp configured to pass through the component of the wind turbine to allow equal load distribution while lifting the component.
In an embodiment, includes lifting frame stools fixed near a gear box front mount in the frame. The stools are configured to allow mounting of each of the first and second lifting frames.
In an embodiment, the system includes a control panel coupled to the crane column post. The control panel is configured to control the operation of the crane boom.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
The portable crane system of the present disclosure for servicing components of nacelle of a wind turbine will now be described with the help of the accompanying drawing, in which:
Figure 1 illustrates a side view of a nacelle, and a nacelle cover, in accordance with an embodiment of the present disclosure;
Figure 2 illustrates a prospective view of a first lifting frame stool installed in the nacelle frame bolted assembly near the gearbox mount and being used to assemble a first lifting frame, in accordance with an embodiment of the present disclosure;
Figure 2A illustrates an isometric view of a second lifting frame stool being used to assemble the first lifting frame, in accordance with an embodiment of the present disclosure;
Figure 3 illustrates a side view of a first lifting post installed over the lifting frame stool by the support of a first temporary lifting frame, in accordance with an embodiment of the present disclosure;
Figure 3A illustrates an isometric view of the first lifting post of Figure 3;
Figure 4 illustrates a side view of the first temporary lifting frame of Figure 3A being used to lift the upper portion of a second lifting post installed over the first lifting post of Figure 3;
Figure 5 illustrates a side view of a fourth lifting post used by a first temporary lifting frame and a second temporary lifting frame being used to lift the second rotating lifting arm;
Figure 6 is a illustrates a side view of a portable lifting structure being connected to the base of the nacelle by the rotating lifting arm of Figure 5;
Figure 7 illustrates an isometric view of the portable lifting structure connected with the support of the first and second rotating lifting arm;
Figure 8 illustrates an isometric view of a pusher arm fixed to move the gearbox from the shrink disc by hydraulic jack, in accordance with an embodiment of the present disclosure;
Figures 9 and 9A illustrate isometric view of a rotor lock assembly holding a rotor disc of the wind turbine and the structure of crane main bed front portion holding a rotor shaft by U-clamp, in accordance with an embodiment of the present disclosure;
Figure 10 illustrates a side view of a portable nacelle crane placed in the nacelle frame, in accordance with an embodiment of the present disclosure; and
Figure 11 illustrates an isometric view of a traction hoist rope assembly connected between a crane boom pulley and a moving pulley and further being connected to a component lifting jig, in accordance with an embodiment of the present disclosure.
LIST OF REFERENCE NUMERALS USED IN DETAILED DESCRIPTION AND DRAWING
100 – Crane system for servicing components of nacelle
12 – Rotor
13 – Nacelle
14 – Nacelle cover
15 – Nacelle frame
16 – Machine head hoist
17 – Main shaft/Rotor shaft
18 – Main bearing
19 – Main bearing mount
20 – Gearbox
21 – Gearbox mount
22 – Rotor disc
25 – Transformer
27 – Stud/Pin/Bolt & Nut
29 – Traction Hoist
30 – Wire rope/Lifting line
31 – Lifting frame
32 – First Lifting Frame stool
33 – Second Lifting Frame stool
34 – First Temporary Lifting Frame
35 – Second Temporary Lifting Frame
36 – First Lifting post
37 – Second Lifting post
38 – Third Lifting post
39 – Fourth Lifting post
40 – First Rotating Lifting Arm
41 – Second Rotating Lifting Arm
42 – Crane front stool
43 – Base stool
44 – Crane back stool
45 – Back counter stool
46 – Crane bed support
47 – Rail type I-beam
48 – Locking Plate
49 – Crane main bed
50 – Rotor lock
51 – Crane C-shaft lock
52 – Crane C-shaft U-clamp
53 – Pusher rod
54 – Pusher plate
55 – Crane column post
56 – Crane boom
57 – Hydraulic Cylinder
58 – Hydraulic Jack
59 – Control panel
60 – Lifting Jig
60A – End Beam
60B – Centre Beam
60C – Pulley lock beam
61 – Fixed pulley
62 – Moving pulley
63 – Pulley lifting block
64 – Chain hoist
65 – Trolley
66 – Shrink disc
DETAILED DESCRIPTION
Embodiments, of the present disclosure, will now be described with reference to the accompanying drawing.
Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms “a”, “an” and “the” may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms “comprises”, “comprising”, “including” and “having” are open-ended transitional phrases and therefore specify the presence of stated features, elements, modules, units and/or components, but do not forbid the presence or addition of one or more other features, elements, components, and/or groups thereof. The particular order of steps disclosed in the method and process of the present disclosure is not to be construed as necessarily requiring their performance as described or illustrated. It is also to be understood that additional or alternative steps may be employed.
When an element is referred to as being “mounted on”, “adapted to”, “connected to” or “coupled to” another element, it may be directly on, engaged, connected or coupled to the other element. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed elements.
Terms such as “front”, “back”, “beneath”, “up”, “down”, “above”, “upper” and the like, may be used in the present disclosure to describe relationships between different elements as depicted from the figures.
The present disclosure envisages a portable crane system 100 for servicing components of nacelle 13 of a wind turbine. The portable crane system 100 for servicing a nacelle 13 (herein after referred to as “crane system 100”) will now is described with reference to Figure 1 through Figure 11.
The crane system 100 is configured to be fitted on a nacelle frame 15 of the wind turbine. The crane system 100 comprises a crane main bed 49, a column post 55, a crane boom 56, a lifting jig 60, a fixed pulley 61, a movable pulley 62, and a traction hoist 29.
In addition to the aforementioned components the crane system 100 includes a wire rope/ lifting line 30, a first lifting frame stool 32, a second lifting frame stool 33, a first temporary lifting frame 34, a second temporary lifting frame 35, a first lifting post 36, a second lifting post 37, a third lifting post 38, a fourth lifting post 39, a first rotating lifting arm 40, a second rotating lifting arm 41, a crane front stool 42, a crane back stool 44, a back counter stool 45, a crane bed support 46, a rail type I-beam 47, a locking plate 48, a crane main bed 49, a rotor lock 50, a crane C-shaft lock 51, a crane C-shaft U-clamp 52, a pusher rod 53, a pusher plate 54, a hydraulic cylinder 57, a hydraulic jack 58, a control panel 59, an end beam 60A, a center beam 60B, a pulley lock beam 60C, a pulley lifting block 63, a chain hoist 64, a trolley 65, and a shrink disc 66.
Fig.1 shows a nacelle 13 that is configured to be mounted on a tower (or base of wind turbine) to capture the energy from the wind. The wind turbine consists of three main parts, the blades (not shown in Figures), a shaft 17 and a generator 24. Further the blades (not shown in Figures) when attached into a hub forms a rotor 12. The rotor 12 is connected to the nacelle 13, while the nacelle 13 supports the key electrical and mechanical equipment responsible for generation of electricity. The key electrical and mechanical equipment includes the main shaft 17, a gearbox 20 and a generator and the like. The nacelle 13 supports the gearbox 20, which controls the rotational speed of the blades in order to drive the electrical generator parts.
The system 100 is suitable to wind turbines made of a lattice structure, tubular steel, concrete or combination and which are bolted to the foundation.
According to embodiment of the present disclosure, the entire assembly is attached by brackets to the bottom half of the nacelle fiberglass cover 14. The assembly is characterized by low weight, temperature resistance, non-corrosion and rigidity.
The nacelle covers 14 are mounted on the bed plate of the turbine and other key components such as the generator 24, the gearbox 20 and the controls from the elements. The nacelle covers 14 have a removable part at top having a hatch in that. This further consists of lower part which it has been at least single piece of cover and removable part at bottom having an at least one hatch therein. And for the future maintenance activities for nacelle components, a hoist is placed inside the top of the nacelle 13 via the top cover 14 for easy access of component and for ease of handling the tools or equipment therein.
Fig. 2 depicts system with the first lifting frame stool 32. The first lifting frame stool 32 is portable. The stool 32 has medium weight and is in the form of a channel which is made of a box type fabricated structural from two piece of similar size channel that has top and bottom surface and is closed by a flange by welding. The top and bottom portion of the first lifting frame stool 32 is a flat based surface and its bottom surface flange position is placed above the nacelle frame 15 near the gearbox front mount 21 on left hand side. This box type first lifting frame stool 32 is fastened with the nacelle frame 15. This embodiment has the particular advantage that if the member is made of a gusset material which is welded between box type fabricated channel and flange in both ends, thereby providing additional strength to lifting frame stool 32, which has a load carrying capability to fix that of fabricated part placed in above the top flange. Further to the top portion of the top flange has provision of holes being made for connecting together with the nacelle frame 15 to form a sequence of assembly and bottom flange also has the same provision is made for fitting to the nacelle frame 15.
In an embodiment, the lifting frame stool 33 is fixed above gear box front mount 21 in the frame 15. The frame stool 32 is fixed in front of the gear box front mount 21. The stools 32, 33 are configured to allow mounting of each of the first and second lifting frames 34, 35.
In an embodiment the first lifting frame stool 32 is fixed in the nacelle frame 15 near the main bearing mount bolt (suitably marked) 27 back portion in left hand side. The stool 32 is lifted by means of any suitable lifting equipment from ground to nacelle 13 and is then fastened with the customized designed studs or bolts 27 on the frame 15. The first lifting frame stool 32 includes bed holes and the nacelle frame 15 holes threads are matched. Further, the nut 27 having multiple threads is turned to the right (clockwise) to tighten with applied specified torque according to the standard grade of the material and size. Further, the tightening of the nut 27 is followed by an assembly of the first lifting post 36 with the support of a first temporary lifting frame 34 which is shown in Fig.3.
Fig. 2A illustrates the second lifting frame stool 33. The second lifting frame stool 33 is designed according to the size of the gearbox front mount 21 dimensions of the nacelle 13 as the available different types of gearbox 20 and its mount 21 dimensions vary in size for different turbine capacity. Due to varying sizes the base also needs to be different of the nacelle 13, so as to determine the width, height and the breadth of the second lifting frame stool 33 is designed to made the assembly over the gearbox front mount 21 in left hand side. The second lifting frame stool 33 of the system 100 is be conveniently fabricated by box like shape wherein flanges of top and bottom portion of the stool 33 are drilled by provisional holes for assembling the bottom flange in above the gearbox mount 21 as well as top flange for fixing the first lifting post 36 as shown in Fig.3. The side plate of the second lifting frame stool 33 has hatch provisions that are framed for access the bolt tightening and releasing by hand tools. Moreover, the second lifting frame stool 33 segments of all plates can be relatively added by gussets has welded for additional strength in transverse dimensions.
Further, specific tools are required to loosen the gearbox mount bolt 27 (suitably marked) front portion in left hand side and removed completely. By using machine hoist or other means lifting equipment used to lift the second lifting frame stool 33 from ground to nacelle 13 and assemble it on the gearbox mount 21 and then fasten with the customized designed studs 27. The second lifting frame stool 33 holes and the gearbox mount 21 holes threads are parallel to the thread axis. Further enters the nut 27 having multiple thread and must be turned to the right (clockwise) to tighten with applied specified torque according to the standard grade of the material and size.
Referring next to Fig.3, another embodiment of the system 100 is illustrated. The second lifting frame stool 33 for assembling a first lifting post 36 with the support of a first temporary lifting frame 34. The first lifting post 36 comprises four longitudinal L-angles, whose flats and channels are made up of steel. This is designed as rectangular shape structure and it constructed the L-angles in four corners longitudinally. As shown in the figure 3, the top and bottom portion is held with L-angle in square shape. The joints of lower end and upper end of the square portions L-angles are welded with longitudinal L-angle. Further this rectangular assembly of L-angles in all four sides is mounted the steel flats inside as crisscross direction in longitudinal position. The assembly of flats is welded altogether with L-angles. This has further comprised two channels are projected one under one provided for fixing the first temporary lifting frame 34 and the same as to be followed in the first lifting frame stool 32 & the second lifting frame stool 33. The temporary lifting frame 34 is attached over the projection of lifting frame stools 32, 33 and fastened to it.
With reference to the same embodiment, the first lifting post 36 is lifted by nacelle hoist or by the first temporary lifting frame 34 and is assembled over the first or second lifting frame stool 32 or 33 as per nacelle frame 15 design. The whole assembly process of the lifting frame stools 32, 33 and the first lifting post 36 are perpendicular to the nacelle frame 15 respectively. According to the joints between the lifting frame stools 32, 33 top surfaces of the first lifting post 36 bottom portion assemblies are connected to the fixing bolts 27 and tighten with specified torque value. In an embodiment, a provision for holes is made on the horizontal plane and vertical plane in both the assemblies which are connected securely as shown in Fig.3A.
Fig.4 depicts that the first lifting post 36 comprises the first temporary lifting frame 34 which is lifted by the nacelle hoist from ground to nacelle 13 with manual force support to access the components of the nacelle 13. The nacelle 13 is fitted in the lattice structure of the first lifting post 36 used over the exact assembly of remaining the second lifting post 37, the third lifting post 38, and the fourth lifting post 39 in the same. Preferably the first temporary lifting frame 34 has hollow square section structure constructed by the hollow square section as segment of top portion and middle portion are welded together. The top part of the first lifting frame 34 is facing away from side of the nacelle 13 and is being designed with hooks that are attached at a position in open face of the hollow square section. The top part extends for assembling the hooks by chain hoist 64 or traction hoist 29 which is in parallel to the wind turbine tower. Accordingly, the chain hoist 64 usage is considerably using only in machineries for assembly of the second lifting post 37, the third lifting post 38, and the fourth lifting post 39.
The first temporary lifting frame 34 further comprises the middle portion consisting of vertical hollow square section which is welded with top portion. The leg length of the middle portion is usually designated such that it has the size greater than the lifting posts. The shape and size of a hollow square section structure is chosen as per lifting capacity of the lifting post and it is determined by the stresses to which it is to be subjected, the smallest cross-sectional area being present where the stress is lowest and increasing in dimensions as stresses increase. The top and middle portions are fitted in the opposite and adjacent sides to the triangular fillet weld. The bottom portion of the middle hollow square section has provided two vertical holes are made one another by one for fixing the first temporary lifting frame 34 in the first lifting post 36 and are fastened together.
The first temporary lifting frame 34 has its end welded with hook which is connected to the chain hoist 64 or a wire rope traction hoist 29 are ideal to drive the system for lifting the load such as the second lifting post 37, the third lifting post 38, and the fourth lifting post 39 and other than that of rotating lifting arms 40, 41. The required length of wire rope 30 is first lifted, and then further it is passed through a traction sheave and is lowered to the ground. In particular it holds the second lifting post 37. At this point it will be noted that reversibility of the operation to assist in this transition, the second lifting post 37 are lifted and it reaches the nacelle 13. By controlling the switch controls like push buttons to place the second lifting post 37 is placed above the first lifting post 36. After the assembling of second lifting post 37, the bolts 27 are entered in the upper holes of the second lifting post 37 and the nut 27 is turned in opposite side of the lower hole in the first lifting post 36, in which assembly is in the axial projection of the proper direction, thus reaches the right position. In side view of the projection is entered by the threaded bolt 27 and tightened the nut 27 with required tightness.
Further, specific controls are followed in the wire rope traction hoist 29 such as over speed safety lock and inclination safety lock with the help of electric switches. Further, it would follow the removal of the first temporary lifting frame 34 from first lifting post 36 by releasing of fasteners 27 and it can again be fitted the same of the first temporary lifting frame 34 into the second lifting post 37. Likewise, the similar procedure of lifting arm assembly in the first lifting post 36 to be continually followed the system 100 and is assembled in second lifting post 37 whereby the top portion of the second lifting post 37 contains the hold plates and gusset plates that are welded together for further extension of the assembly.
Fig. 4 illustrates that the assembly of third lifting post 38 comprises cross supports, at least four vertical equal angles, a base coupled to the plurality of angle and a deployable top. These pluralities of portions are welded to one another and result into formation of lattice type longitudinal third lifting post 38. The lattice structure assembly is a rigid type and it also includes means for at least one hold plate and a plurality of gusset welded on one another in top of the third lifting post 38 and in bottom side of the lifting post says the embodiments such as same hold plate and a plurality of gusset plates are welded together. Further, the method of assembly has a first temporary lifting frame 34 to operate the wire rope traction hoist 29 to lift the third lifting post 38 and it is controlled to assemble the base placed in above the top surface of the second lifting post 37.
The first temporary lifting frame 34 is removed subsequently from the second lifting post 37 and is assembled on the third lifting post 38 segment projections with plurality of fasteners are tightened together. The enclosed lifting arm device assembly is parallel to the support structure of the third lifting post 38 and is perpendicular to the nacelle frame 15.
Fig.5 depicts a handling unit such as the fourth lifting post 39 its shape and structure have same design as the third lifting post 38. The connection between the third lifting post 38 & the fourth lifting post 39 is carried out by screwing the fasteners in lattice structure to fix the operative top portion of the third lifting post 38 to the operative bottom portion of the fourth lifting post 39 together. In addition to that, this is an alternative process of the second temporary lifting frame 35 being attached to the above the fourth lifting post 39. The plurality of lifting post 36, 37, 38, and 39 are assembled one above the other with the first rotating lifting arm 40 and second rotating lifting arm 41 coupled therewith. In an embodiment, the system 100 includes the first and second lifting frames 34, 35 configured to be temporarily disposed in the nacelle 13. Each of the first and second lifting frames 34, 35 is configured to allow assembling of the lifting posts 36, 37, 38, 39.
The fourth lifting post 39 has a flange type base which has equally match with equal side base of the second lifting post 37 such that they equally fit one another and can be fastened with fasteners and is used to lift and assemble the first rotating lifting arm 40 and the second rotating lifting arm 41. The method includes the step of attaching a wire rope traction hoist 29 into the hook for lifting and assembly controls of the first rotating lifting arm 40 and the second rotating lifting arm 41 in alternative manner. The wire rope traction hoist 29 operates the wire rope 30 and drops from second temporary lifting frame 35 in perpendicular to the surface and its functions with their controls.
The lattice structure of the fourth lifting post 39 includes of the second rotating lifting arm 41 comprises the top support as an I-beam, bottom supports as a medium weight channels are closed in opposite faces and are welded together with hooks and fastened with a plurality of pins and bolts 27. Further, the connection methods for the top support of the second rotating lifting arm 41 are adapted to the fourth lifting post 39 via the hold plates and are secured with the pin and nuts 27, in such a way that they take bottom support of second rotating lifting arm 41 and are in turn connected to the third lifting post 38 hold plates and are assembled with pin and nuts 27. Further joints of the lifting end of the second rotating lifting arm 41 between the top support and the bottom support has provided with flanges are fastened together with plurality of bolts and nuts 27 are tightened together. In use, the top support act as an anchoring beam longitudinally mounted by chain pulley 64 with trolley 65 for moving and lifting the load. The second rotating lifting arm 41 portions to be swing able about a second rotation axis substantially perpendicular to the fourth lifting post 39 and is parallel to the first lifting arm 40.
In addition, the third lifting post 38 and the fourth lifting post 39 have some hooks to be fixed at certain points of said presented in four sides for support to hold with stay support by wire rope 30 on one end is commonly connected in nacelle frame 15 and another end of the rope 30 is connected in hooks of the third lifting post 38 and the fourth lifting post 39. Mainly this is distributing the lifting loads during lift and assembly of nacelle crane structure part into the nacelle frame 15. The size of the wire ropes 30 depends upon load factor.
The first rotating lifting arm 40 comprises the bottom support with an I-beam, top supports have medium weight channels that are boxed and welded together with hook and a plurality of pins and bolts 27. The bottom supports contains hooks which it has lifted and attached to the top of the second lifting post 37 which contains hold plates that are matched with it and entered through the pin 27 to be rotatable about a first rotation axis at a distal end thereof. Further the top support of the first rotating lifting arm 40 is attached to the bottom portion of the third lifting post 38 with holding plates are inserted with the pin and nuts 27. Further joints of the lifting end of the first rotatable lifting arm 40 between top support and bottom support are fastened together with plurality of bolts and nuts 27 are tightened with required torque value. At present the first rotating lifting arm 40 portions to be swing able about a rotation axis substantially perpendicular to the lifting posts 36, 37, 38, and 39.
Fig.6 illustrates the crane back stool 44 is lifted from the ground through wire rope traction hoist 29 which is attached to the first rotating lifting arm 40. The fixation of the crane back stool 44 is positioned and attached above the face of the main shaft 17 in some distance from back side of the main shaft bearing 18. According to the schematic of the main shaft bearing 18 present innovation of crane back stool 44 is suitable for single SRB (Spherical roller bearing) arrangement, Double SRB arrangement and other type of designs.
Specifically, the main shaft 17 for wind power generators is the heaviest part in the nacelle 13. As the mass effect was quantified and the safety factor of the main shaft 17 has been considered for calculated and designed the crane back stool 44 depending on the depth from the surface. Further the system 100 comprises the crane back stool 44 curvature formation is made as per circumference of the main shaft 17 design and it placed above the main shaft 17 back side, further it belongs the bottom face of the projection is placed above the nacelle frame 15 projections in left hand side and right-hand side.
The crane back stool 44 consists of two arch type plates, plurality of end plates and plurality of gussets which totally says as trapezoidal shapes in outer lines and the inner part of the plate is made up of curvature shape. A metal plate arched longitudinally, and having its side walls protruded, and having a strengthening- arc plates subsequently welded between two arch plates with number of side plates and gussets. The safety factor with consideration of the mass effect is a more stable and effective method for the crane back stool 44. It contains top and bottom face contains sufficient holes for necessary assemblies.
Referring to Fig. 7, it is seen that two sets I-beam 47 plugged with crane back stool 44 by locking plates 48 and pins 27. The I-beam web consists of pin 27 inserted holes in required diameter size are developed at some distance to distance toward the side web of the beam in both sides, said laterally rectangular shape being less than the width of the web of the plurality of side plates are welded in edge of the web one another in equal distance and the end of the I-beam 47 is closed with stopper plate which is welded in both ends said laterally assemble two sets of I-beam 47 through connected by bushes, studs and nuts 27 are arranged by the shape like rail track.
Substantially aligned between the two sets I-beam 47 said at lateral assembly is maintained in uniform distance said intermediately fix with the bushes and further inserting the pin 27 in side face of the first I-beam holes provision to come out with opposite side of the second I-beam enters the pins 27 to snugly fit the pin holes and is tightened with nuts 27. The assemblies of these two I-beams are aligned parallelly and perpendicularly bolts 27 are then used to permanently secure the elements together. The combination of nut and pin 27 assembly of this crane system 100 is then removed for reuse.
The assemblies of this system 100 are suited for space available in the nacelle frame 15 below the main shaft 17 said that the assembly of rail type I-beam 47 is fitted below the crane back stool 44 by installed with locking plate 48 have a rectangular shape through pin 27. At both ends and middle portion of the rear lower portion of the main shaft 17 said that top face of the I-beam assembly is fit with bottom face of the nacelle frame 15 has hold with locking plate 48 and enters the pin 27 from crane back stool 44, I-beam assemblies 47 and locking plate 48 are snugged with nuts 27. The first end, middle, final end has at least three holes provisions said that the first holes are projected from the front outer face of crane back stool 44 to front outer I-beam assembly 47 then locking plate 48, further said that the second holes are projected from middle part of crane back stool 44 to middle part of I-beam assembly 47 then locking plate 48, further said that the third holes are projected from back outer face of crane back stool 44 to back outer I-beam assembly 47 then locking plate 48.
Alternative to the I-beam assembly 47 which is neglected to fit in some of the main shaft 17 have an covered with casing construction in outside with connected to nacelle frame 15, then further there is flat based crane back stool 44 have made with two plates are vertically welded 90° upwards with supported by gusset in center of the stool and some plates are vertically welded downwards in angle wise like as to formation of casing outer shape for suitable to fit with the attachment in top base of the main shaft 17 flange back portion. Since there is plurality of holes is made in crane back stool 44 base corresponding to that of matching of available holes in back side main shaft 17 casing. Further, it becomes easy to fix the part and enter the studs 27 to tighten the portion.
As shown in Fig. 7, the above top view face of the crane back stool 44 has cipolletti or trapezoidal shape formed for being separately to fix the assembly made as like broad crested view of back counter stool element which has various kind of plates are welded and a top portion is an H-shape projection has protruded. Further, it is preferred that an assembly of said back counter stool 45 are placed above the crane back stool 44 correspondingly to that the bolts 27 are entered in bottom flange of the back-counter stool 45 to crane back stool 44 holes and screw there from. Further, this comprises rhombohedron hollow shapes steel parts made as by plates called as crane bed support 46 provides as a backup piece that extends over the above in crane back stool 44 at side position. The crane bed support 46 is configured to maintain the holding in place, which are respectively bolted to the drill segments.
Fig. 8 illustrates the system 100 in accordance with the other aspect of the present disclosure. More particularly the crane front stool 42 have a shape like double curvature shell type and the plates are welded together for more rigidity between two plates. The crane front stool 42 preferably comprises flat base shape at top side and bottom portion have a curvature shape made according to the main bearing 18 outer shape. Further, the shell type crane front stool 42 has projected with side plates and flanges have welded one another and this is fixed against the customized base stool which is placing above the main bearing mount 19. The width of the crane front stool 42 is greater than the main bearing 18 width and its orientation on the model by entering the two studs on left hand side and right-hand side. In an embodiment, the first and the second lifting frames 34, 35 are configured to lift the crane front stool 42, the crane back counter stool 45, the base stool 43, the crane main bed 49, the column post 55, the crane boom 56, the movable pulley 62, and the a traction hoist 29 from ground to nacelle 13.
In order to that, the base stool 43 bottom portion is made shell type have plates are welded in four sides suitable to fit with top of the main bearing mount 19 in front at both sides (left hand side & right-hand sides). Furthermore, the required bolts 27 are loosening and removed on the top of the main bearing mount 19 at both sides. Further, at the base tool 43 has place above the main bearing mount 19 which have an inner screw thread and enter the customized studs 27 into base stool then main bearing mount 19 holes to tighten the clockwise direction to a predetermined snug torque it at both sides. In an embodiment, the crane front stool 42 and the crane back stool 44 are supported by the base stool 43.
Since place of the element of the crane front stool 42 is seated above the top face of the main bearing 18 casing in front side or near the rotor disc 22 and the side portion have seated above the base stool 43 at both sides, and further enters the fasteners to tighten at both sides. A torqueing tool is used to applying the rotational force and specific torque to a fastener such as bolt head in perpendicular to the thread axis. In the embodiments says the top face of the crane front stool 42 have some drilled holes are made for further assemblies towards uppermost direction.
Turning to the fabrication of the crane main bed assembly 49 which shows a construction of the combined double H-shape structural elements of the present system 100 described the formation may be accomplished as follows: First, the two longitudinal solid rectangular section bars have presence with slotted holes and drilled holes for matching with existing assembly which are connected with the solid flat in cross-section said as H-shape. Further, the end of the solid rectangular section bars are closed with flat bar, then the above of the H-shape structure the rectangular shape backplate are arranged at predetermined positions respectively and the top of the backplate are arranged the simple effects of waves elevation have present with holes are fixed in the same manner as in the case of the two solid rectangular section bars.
Further, in the assembly of H-section means two longitudinal solid rectangular section bars are protruded at both sides with at least two number of rectangular section bar like as spider leg is end with second longitudinal solid rectangular section bar in said as H-shape which have required desired size of the holes are present in the element. The construction of the total welded part is called as crane main bed, it comprises the assembly of crane main bed 49 is matting with the part of crane front stool 42, crane back stool 44 and crane bed support 46 which is connected with pins 27 and is tightened by nuts 27.
In another embodiment of the system 100 a pusher plate 54 is made a single plate in rectangular shape with center has provided the semi-circle cut open is made as per main shaft 17 dimension, further to the assembly is made the round rod and its ends with flanges. The relative assemblies of the pusher plate 54 are fixed above the main shaft 17 near the front main bearing 18, further the pusher rod 53 is entering through the crane back stool 44 provided holes according to the figure further travels the pusher rod 53 end touches the shrink disc 66. The designs of shrink disc 66 is coupled the gearbox 20 hollow shaft and main shaft 17, further consists of either one or two thrust rings with tapered bores and a mating tapered inner ring. Further the connection of releasing the locking screws, the hydraulic jack 58 is placed between the pusher plate 54 and pusher rod 53 means back end is locked the pusher plate 54 and the front end is touching the pusher rod 53 front end. Generally, the main shaft 17 is conical in shape which increases the dimensions in front side, i.e. the concept of the pusher plate 54 is locked in main shaft 17 while applying the load. The other end of the pusher rod 53 is touching the shrink disc shaft 66, then using hydraulic jack 58 to applying pressure to the pusher rod 53 increased up to the targeted pressure, further the shrink disc 66 can be removed from the gearbox 20 hollow shaft. Then the gearbox 20 is moved free from front end.
Fig. 9 depicts an exploded view, showing the relative positions of the rotor disc lock 50 assemblies for their installation of additional support for holding the rotational motion. The system 100 is made as a plate in half circle shape have provisional holes size as occurred in rotor disc PCD (pitch circle diameter) and the both ends are welded with stopper plate. Further rotate the rotor 12 is required position to apply the brake for fixation of a rotor lock plate 50 is assembled substantially axial direction between a position in which the rotor is locked against rotational movements, then enters both studs in left hand side and right-hand side of the stopper plates to base stool 43 and tightened with bush nut 27 as shown in the same figure. In an embodiment, the front stool 42 and the crane back stool 44 is mounted on the frame 15, thereby allowing the crane main bed 49 to be mounted on the crane front stool and the crane back stool 44.
In an embodiment, the extension of the crane main bed 49 end is made of customized metal parts of crane C-shaft lock 51 for holding the crane C-shaft U-clamp 52 through main shaft 17 between rotor 12 and main bearing 18 as shown in Fig.9A. The crane C-shaft U-clamp 52 is a U- shape which is made of steel rod and the end portion has threaded. Actually, the crane C-shaft U-clamp 52 is enters below from the main shaft 17 to hold with the top portion of crane C-shaft lock 51 and fastened it. In another embodiment, the second support while lifting the component by crane carries the load and the opposite end holds with crane C-shaft U-clamp 52 and is subjected to a structural load. Further, the cantilever beam carries the load to the support where it is forced against by a moment. The C-shaft U clamp and lock 51, 52 configured to hold the main rotor shaft 17 of the turbine, the U clamp 52 configured to pass through the component of the wind turbine to allow equal load distribution while lifting the component i.e., the gearbox 20.
Fig. 10 depicts the system 100 consisting of the crane column post 55, crane boom 56, hydraulic cylinders 57, pulleys and traction hoist 29 with ropes 30, since the design of the components was specifically made for this purpose. Further, the crane column post 55 which comprises hydraulic cylinder 57 with piston, bottom portion has a plate which is a flat based circular shape and further its projected over by the vertical plates are one another with formation of construction made which is lifted from the ground to assemble over the crane main bed 49 connected with longitudinal pins 27. The crane column post 55 has vertical shape and this rotatable supporting member is mounted to rotate relative to vertical post. The crane column post 55 and crane main bed 49 are attached to the studs & pins 27. At the upper end of the crane column post 55 as shown the crane lifting boom 56 which has been lifted by a lifting post to the desired height, lowered in the place of crane column post 55 and mounted to the top joints with fasteners 27. The assembly further comprises lifting the traction hoist 29 mounted in the crane lifting boom 56 back side with heavy duty fasteners. Accordingly, the portable nacelle crane system mounted in the Fig. 10 corresponds to that all the drives, moving parts such as hydraulic cylinder 57 with piston, and ropes 30 necessary for them are fully assembled within the nacelle 13. Subsequently, the power supply is provided for the drives and control cabinet 28 located on the crane column post 55 and the portable nacelle crane is ready for use after further fine tuning.
Further the in the system 100 the traction hoist 29 is the ideal drive for lifting or lowering the components by wire rope 30, hence the bundle of steel rope length is chosen for required height of the tower to nacelle 13 which passes through a traction sheave in traction hoist 29 and further travels to fixed pulley 61 which is connected end of the crane lifting boom 56 and the end of wire rope 30 has been wounded in moving pulley 62, finally it holds by clamps or wedge socket with rope 30 itself. The arrangement between fixed pulley 61 and moving pulley 62 says the block and tackle arrangement of the system 100. Further this arrangement of the moving pulley 62 is end with hook for holding the components through lifting jig 60. The function describes about the traction hoist 29 is found friction between a V-shaped groove of the sheave or any other shape and then the rope pressed in the groove produces the traction.
The crane main bed 49 is removably fixed to the nacelle frame 15. The column post 55 is vertically extending from the crane bed 49. The crane boom 56 is pivotally coupled with free end of the column post 55. The lifting jig 60 is fixed onto a component such as the gearbox 20 to be serviced. The fixed pulley 61 is operatively disposed at operative end portion of the crane boom 56. The movable pulley 62 is operatively disposed on the lifting jig 60 in line with the fixed pulley 61. The traction hoist 29 is fixed on the crane boom 56. The hoist 29 is configured to provide a lifting line 30 to pass through the fixed pulley 61 on to the movable pulley 62 and back to the fixed pulley 61. The traction hoist 29 and the crane boom 56 are configured to facilitate rotation of the boom 56 horizontally in a predetermined position to operate and to position the nacelle crane hoisting point at a predetermined position inside and outside of the nacelle. The hoist 29 and the crane boom 56 are further configured to lift components and lowering of the components from the nacelle to ground to service the components.
The portable nacelle system 100 can rotate horizontally turns 360° in required position to operate or enabling the positioning of the nacelle crane hoisting point at any position inside and outside of the nacelle 13. The portable nacelle crane system 100 is telescopic type which may be extendable at least by 3 meters by means of the hydraulic cylinder 57 with piston is configured to act as a cantilever and facilitate translational swinging movements in vertical as maximum working radius of 65° and/or horizontal planes or a combination of such movements. In an embodiment, the crane boom 56 is telescopic type configured to be extendable by means of the hydraulic cylinder.
In an embodiment, the system 100 includes a hydraulic cylinder 57 operatively coupled to the crane boom 56 and is configured to allow crane boom 56 to act as a cantilever and facilitate translational and swinging movements in vertical and/or horizontal planes or a combination of such movements thereof to lift and lower the components. In an embodiment, the system 100 includes a control panel 59 which is coupled to the crane column post 55. The control panel 59 is configured to control the operation of said crane boom 56.
Fig. 11 provides an enlarged perspective view, showing the relative positions of the component lifting through lifting jig 60. In an embodiment, the lifting jig 60 includes at least two end beams 60A, at least two center beams 60B, and at least two pulley lock beams 60C. The center beams 60A are coupled between the two end beams 60B and being perpendicular to the end beams 60A. The two pulley lock beams 60C are coupled perpendicular between the center beams 60B to hold the movable pulley. The end beams 60A, center beams 60B and pulley lock beams 60C are assembled one another and holds with pin and nuts 27. Based on that permanent anchoring point available is in component such as gearbox 20 or any other component relatively for lifting jig hook a provision has been made as the weight is evenly dispersed in all sides of the lifting tool are in balance to maintain the center of gravity which is attached with the H-shaped lifting jig 60. The construction of the lifting jig 60 is customized and fabricated with the steel parts of rectangular hollow sections in various sizes with the combination of plates, pins/fasteners 27 has been made which is generally assembly as shown in same figure.
The system of traction hoist rope line 30 is physically interconnected between the fixed pulleys 61 and moving pulleys 62. In an embodiment, the traction hoist 29 is configured to drive in or drive out the lifting line 30 while lifting or lowering the components. The system 100 is further operated by using the electrical controls, the crane column post 55 assembly is rotated and placed in that right position to hold, then the hydraulic cylinder 57 is actuated accordingly crane boom 56 is moved required that extends up or down movement, then it lowered the moving pulley 62 to center axis of the lifting jig 60 then it holds by pulley lifting block 63 to pulley lock beam 60c, therefore its perfectly acts in vertical position while in loading and its overcome the eccentrically loads, hence the safe working loads remains the same in lowering or lifting time carry 100% of rated load. Meanwhile to fix the value for maintain the lift range and its higher angle of lift load in lifting or lowering the gearbox 20 or other components.
In order to that, the removal of necessary fasteners connections and joints between the gearbox 20 and nacelle frame base 15, gearbox 20 and coupling, gearbox 20 and front mount suspension 21, gearbox 20 and rear main bearings 18 as well as the description of Fig.8 says the shrink disc 66 removal from the gearbox 20 hollow shaft in front end. Further free from the joints or connections of gearbox 20, the operative controls the total weight of gearbox 20 being able to be supported both while slowly rolling with the load at a zero-degree angle (creep), then the operator shall be examined and marked with safe working loads to continue the operation of total weight able to be supported while moving the gearbox 20 from nacelle 13 inside to outside. With the continuous operation is coordinated and controlled the wire rope 30 through traction hoist 29 is lowering the gearbox 20 from the nacelle 13 to ground.
Necessarily, the lifting jig 60 is removed from the gearbox 20 when the gearbox 20 reaches on ground from nacelle 13, and is then reassembled with the new gearbox 20 or any other serviced component through manual force. The replaced gearbox 20 is raised using the coordinated operation control is followed by traction hoist 29. When the gearbox 20 reaches the nacelle 13, the traction hoist 29 operation is stopped, further required swing operation to be performed, until the gearbox 20 close to vertical position of the bed, then the traction hoist 29 control to lower the gearbox 20 to bed enough the base of the nacelle 13 and mount with the nacelle frame 15. The team in the nacelle 13 re-connects all the fasteners 27 which were taken apart while re-erecting the wind turbine gearbox bolts 27 with the correct holes to aligning zero position of the gearbox 20. Further it’s aligned in exact position, the portable nacelle crane system 100 operation is stopped and the tightening the nuts on the pins or bolts 27 with specified torque according to be followed the standard fasteners torqueing pattern.
The pulley lifting block 63 of moving pulley 62 is disconnected from the gearbox lifting jig 60. By using the lower capacity of traction hoist 29 with wire rope 30, the gun tackle arrangement, lifting jig 60, crane boom 56, crane column post 55, pusher rod 53, pusher plate 54, crane bed 49, etc. is being removal or removal from nacelle 13 of wind turbine for lowered to the ground. The lifting lines 30 are also lowered to the ground. The lifting lines 30 are then lowered to the ground. Finally, all the connections between/around the gearbox 20 are examined thoroughly.
Thus, the crane system 100 of the present disclosure is used for easy and efficient lowering and lifting of the components such as the gearbox 20 or any other component of wind turbine nacelle 13. Further, the crane system 100 is applicable for all hub heights and is suitable for different types of tower like closed type tubular tower, lattice tower and hybrid tower accordingly. Specifically, it is designed to use on horizontal axis wind turbines only and gearbox 20 replacing without removal of rotor 12 and any other component such as generator 24, transformer 25 and control cabinet 28. The system 100 is suitable to configure the setup for a spherical roller bearing (SRB), cylindrical roller bearing (CRB) and tapered roller bearing (TRB) and any other main bearing type arrangements of the nacelle 13 including said front bearing only or front & back main bearing construction in wind turbines to lift and lower the components.
The portable crane system 100 is removable fixed to a wind turbine tower and can easily move in horizontal direction with in the nacelle at a desired position while removal and installation of components.
The foregoing description of the embodiments has been provided for purposes of illustration and not intended to limit the scope of the present disclosure. Individual components of a particular embodiment are generally not limited to that particular embodiment, but, are interchangeable. Such variations are not to be regarded as a departure from the present disclosure, and all such modifications are considered to be within the scope of the present disclosure.
TECHNICAL ADVANCEMENTS
The present disclosure described herein above has several technical advantages including, but not limited to, the realization of a derrick structure for replacement of a generator of a wind turbine that:
• facilitates effective and efficient removal and installation of components from nacelle;
• can be removable fixed to a wind turbine tower; and
• easily moves in horizontal direction with in the nacelle at a desired position while removal and installation of components there from.
The foregoing disclosure has been described with reference to the accompanying embodiments which do not limit the scope and ambit of the disclosure. The description provided is purely by way of example and illustration.
The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein.
The foregoing description of the specific embodiments so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.
,CLAIMS:WE CLAIM:
1. A portable crane system (100) for servicing components of nacelle (13) of a wind turbine, said crane system (100) configured to be fitted inside a nacelle (13) on a nacelle frame (15) of the wind turbine, said crane system (100) comprising:
• a crane main bed (49) removably fixed to the nacelle frame (15);
• a column post (55) vertically extending from said crane bed (49);
• a crane boom (56) pivotally coupled with free end of said column post (55);
• a lifting jig (60) fixed onto a component (20) to be serviced;
• a fixed pulley (61) operatively disposed at operative end portion of said crane boom (56);
• a movable pulley (62) operatively disposed on said lifting jig (60) in line with said fixed pulley (61); and
• a traction hoist (29) fixed on said crane boom (56), said hoist (29) configured to provide a lifting line (30) to pass through said fixed pulley (61) on to said movable pulley (62) and back to said fixed pulley (61), said traction hoist (29) and said crane boom (56) configured to facilitate rotation of said boom (56) horizontally in a predetermined position to operate and to position the nacelle crane hoisting point at a predetermined position inside and outside of said nacelle (13), and further configured to lift said component and lowering of said component from said nacelle (13) to ground to service the component.
wherein said portable crane system (100) can and said crane system capable of lifting and moving components from the nacelle and the ground.
2. The crane system (100) as claimed in claim 1, which includes a hydraulic cylinder (57) configured to allow said crane boom (56) to act as a cantilever and facilitate translational and swinging movements in vertical and/or horizontal planes or a combination of such movements thereof to lift and lower the component (20).
3. The crane system (100) as claimed in claim 2, wherein said crane boom (56) is telescopic type configured to be extendable by means of the hydraulic cylinder (57).
4. The crane system (100) as claimed in claim 1, wherein said lifting jig (60) includes:
a. at least two end beams (60A);
b. at least two center beams (60B) coupled between said two end beams (60A), said center beams (60B) being perpendicular to said end beams (60A); and
c. at least two pulley lock beams (60C) coupled perpendicular between said center beams (60B) to hold said movable pulley (62).
5. The crane system (100) as claimed in claim 1, wherein said traction hoist (29) is configured to drive in or drive out said lifting line (30) while lifting or lowering the components.
6. The crane system (100) as claimed in claim 1, which includes a crane front stool (42) and a crane back stool (44) mounted on said frame (15), thereby allowing said crane main bed (49) to be mounted on said crane front stool (42) and said crane back stool (44).
7. The crane system (100) as claimed in claim 6, wherein said crane front stool (42) and said crane back counter stool (44) are supported by a base stool (43).
8. The crane system (100) as claimed in claim 7, which includes a first and second lifting frame (34, 35) configured to be temporarily disposed in said nacelle (13), each of said first and second lifting frames (34, 35) configured to allow assembling of a first lifting post (36), a second lifting post (37), a third lifting post (38) and a fourth lifting post (39).
9. The crane system (100) as claimed in claim 8, wherein said lifting frames (34, 35) are configured to lift said crane front stool (42) and said crane back counter stool (44), said base stool (43), said crane main bed (49), said column post (55), said crane boom (56), said movable pulley (62), and said a traction hoist (29) from ground to nacelle (13) and assemble an fasten it on the nacelle frame (15).
10. The crane system (100) as claimed in claim 6, wherein said crane back stool (44) is assembled on a crane back counter stool (45) using fasteners (27).
11. The crane system (100) as claimed in claim 1, wherein end portion of said crane main bed (49) includes a C-shaft lock (51) for holding a crane C shaft U-clamp (52) through a main shaft (17) between a rotor (12) and a main bearing (18) of the wind turbine.
12. The crane system (100) as claimed in claim 1, which includes lifting frame stools (32, 33) fixed near a gear box front mount (21) in the frame, said stools (32, 33) configured to allow mounting of each of said first and second lifting frames (34, 35).
13. The crane system (100) as claimed in claim 1, which includes a control panel (59) coupled to said crane column post (55), said control panel (59) configured to control the operation of said crane boom (56).
Dated this 9th day of July, 2021

_______________________________
MOHAN RAJKUMAR DEWAN, IN/PA – 25
of R.K.DEWAN & CO.
Authorized Agent of Applicant

TO,
THE CONTROLLER OF PATENTS
THE PATENT OFFICE, AT CHENNAI