U.S. patent application number 16/452617 was filed with the patent office on 2019-10-17 for main shaft fixture.
This patent application is currently assigned to LIFTRA IP APS. The applicant listed for this patent is LIFTRA IP APS. Invention is credited to Per E. FENGER.
Application Number | 20190316569 16/452617 |
Document ID | / |
Family ID | 55652612 |
Filed Date | 2019-10-17 |
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United States Patent
Application |
20190316569 |
Kind Code |
A1 |
FENGER; Per E. |
October 17, 2019 |
MAIN SHAFT FIXTURE
Abstract
A main shaft fixture for fixing a main shaft on a wind turbine
during installation and repair work on heavy parts of the wind
turbine nacelle, in the case where the fixture is formed of several
sections for mounting on stable structural parts in the nacelle,
including the nacelle's bottom frame. The main shaft fixture has
adjustable pressure mandrels with tap shoes, which cause the
fixture to be usable regardless of the turbine main shaft geometry,
such that it can be mounted without fixing the rotor. The main
shaft fixture also has facilities for mounting of a lightweight
crane and a self-hoisting crane with a ground-based winch,
respectively, as well as a rotor lock which, in combination with
actuators of the main shaft fixture, enables the main shaft and the
main shaft bearing to be sufficiently displaced vertically from its
bearing in the nacelle to service or replace the bearing.
Inventors: |
FENGER; Per E.; (Terndrup,
DK) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LIFTRA IP APS |
Aalborg SV |
|
DK |
|
|
Assignee: |
LIFTRA IP APS
Aalborg SV
DK
|
Family ID: |
55652612 |
Appl. No.: |
16/452617 |
Filed: |
June 26, 2019 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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15517288 |
Apr 6, 2017 |
10378518 |
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PCT/DK2015/000040 |
Oct 6, 2015 |
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16452617 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B23B 31/101 20130101;
F05B 2230/60 20130101; F05B 2260/30 20130101; Y02P 70/50 20151101;
F05B 2230/80 20130101; F05B 2240/60 20130101; Y02E 10/72 20130101;
Y02E 10/722 20130101; F16C 2360/31 20130101; F03D 13/10 20160501;
F16C 35/062 20130101; B23B 31/16 20130101; Y02P 70/523 20151101;
Y10T 279/1274 20150115; Y10T 279/1291 20150115; Y10T 279/1986
20150115; F03D 80/50 20160501; F03D 80/70 20160501; F05B 2230/61
20130101 |
International
Class: |
F03D 80/50 20060101
F03D080/50; B23B 31/10 20060101 B23B031/10; F03D 13/10 20060101
F03D013/10 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 7, 2014 |
DK |
PA 2014 00573 |
Sep 4, 2015 |
DK |
PA 2015 00527 |
Claims
1. A self-hoisting crane comprising: mounting facilities for
mounting to a lightweight crane, a winch located on a ground
surface near a foot of the wind turbine, and a main shaft fixture
for fixation of a main shaft on a wind turbine during execution of
installation and repair work on heavy parts of a wind turbine, the
fixture being divided up into a number of sections for mounting on
stable structural parts in a wind turbine nacelle including a
bottom frame of the nacelle, wherein the main shaft fixture
comprises at least three independently, radially displaceable
pressure mandrels for fixing of cylinder-shaped shafts with
different diameters and for the fixing of shafts with conical
shapes, the pressure mandrels being substantially symmetrical
located around a center axis, first ends of said pressure mandrels,
in use, facing the main shaft and being furnished with a tap shoe,
wherein said pressure mandrels are displaceable between a passive,
withdrawn lockable, position where the tap shoes are configured to
be located at a distance from the surface of the main shaft and an
advanced lockable position where the tap shoes are configured to be
engaged with the main shaft, in use, said tap shoes enabling the
main shaft to be fixed in position by the main shaft fixture while
being permitted to rotate.
2. The self-hoisting crane according to claim 1, wherein the
pressure mandrels (18) are provided with actuators for displacing
and retaining the tap shoes (20) in the passive position and the
active position, respectively, or in a selectable position between
the passive and the active position.
3. The self-hoisting crane according to claim 1, wherein the
pressure mandrels (18) are comprised of threaded bolts having
opposing free ends that face the main shaft and are furnished with
tap shoes (20), and wherein said threaded bolts cooperate with
threaded holes in respective sections of the fixture (10).
4. The self-hoisting crane according to claim 1, wherein slide
plates (42, 44) are located between the opposing sides of the
surface of the main shaft and tap shoes.
5. The self-hoisting crane according to claim 4, wherein the slide
plates are configured so that the opposing free ends of the tap
shoes (20) facing the main shaft (4) are provided with a one of the
slide plates (42) which in an active advanced position is engaged
with the main shaft (4).
6. The self-hoisting crane according to claim 5, wherein one of the
slide plates is a multi-part slide plate (44) cooperating with the
main shaft (4) for mounting on the main shaft (4), where the
multi-part slide plate (44) in a mounted position on the main shaft
(4) cooperates with the tap shoes (20).
7. The self-hoisting crane according to claim 1, further comprising
a rotor lock (24) for fixation of the rotor (8) of the wind
turbine.
8. A self-hoisting crane with a main shaft fixture (10) for
fixation of a main shaft (4) on a wind turbine during execution of
installation and repair work on heavy parts of a wind turbine,
where the fixture (10) is divided up into a number of sections for
mounting on stable structural parts (2) in a nacelle in a wind
turbine, including the bottom frame (2) of the nacelle, wherein the
main shaft fixture (10) comprises at least three radially
displaceable pressure mandrels (18), substantially symmetrical
located around a center axis (11) of the main shaft, first ends of
said pressure mandrels (18) face the main shaft (4) and are
furnished with a tap shoe (20), and wherein said pressure mandrels
(18) are displaceable between a passive, withdrawn lockable
position where the tap shoes (20) are configured to be located at a
distance from the surface of the main shaft (4) and an advanced
lockable position where the tap shoes (20) are configured to be
engaged with the main shaft (4), further comprising a rotor lock
(24) for fixation of the rotor (8) of the wind turbine, further
comprising one of a multi-part needle bearing, roller bearing, or
ball bearing (46) comprised of a multi-part inner ring (48)
fastened to the main shaft (4), and a therewith cooperating
multi-part outer ring (50) comprised of bowed sub-segments (52)
corresponding to the number of tap shoes, mounted on the opposing
side of the tap shoes (20) facing the inner ring (48), which in the
advanced active position of the pressure mandrels form the outer
ring (50) at a distance from the outer periphery of the multi-part
inner ring (48), and where a plurality of needle rollers, rollers,
or balls (54) are arranged between the inner ring (48) and the
outer ring (50), and where means are present for retaining the
needles, rollers, or balls (54) in position between the inner ring
(48) and outer ring (50).
9. The self-hoisting crane according to claim 8, wherein main shaft
fixture (10) is connected by mounting facilities (40) the crane
(12).
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a Divisional of U.S. patent application
Ser. No. 15/517,288 filed Apr. 6, 2017, which is a 371 of
International Patent Application No. PCT/DK2015/000040 filed Oct.
6, 2015, which claims the benefit of priority to Denmark Patent
Application No. PA 2015 00527 filed Sep. 4, 2015, and to Denmark
Patent Application No. PA 2014 00573 filed Oct. 7, 2014, the
contents of which are incorporated herein by reference in their
entirety.
BACKGROUND OF THE INVENTION
Field of the Invention
[0002] The present invention relates to a main shaft fixture for
the fixing of a main shaft on a wind turbine during the execution
of installation and repair work in heavy parts of a wind turbine
arranged in a nacelle on wind turbines, with the fixture being
divided up into a number of sections for installation on stable
structural parts in a nacelle in a wind turbine, including the
nacelle's bottom frame.
Description of Related Art
[0003] During installation and repair work on the nacelle of wind
turbines there is often a need to perform fixing of the main shaft
of the wind turbine, for example, with the replacement and
servicing of a wind turbine gear box, generator or with the
replacement of its main bearing, or other heavy structural parts
present in the nacelle of the wind turbine. The stated components,
which are mutually conjoined and anchored to the nacelle's bottom
frame, are stable in an assembled state, but when separation needs
to be undertaken during repairs and servicing of the turbine,
static instability and imbalance arises, which can lead to the
turbine's structural parts being damaged, so that there is a need
to fix the wind turbine main shaft.
[0004] German Patent Application DE 102006013539 A1 (NORDEX ENERGY
GMBH) discloses a main shaft fixture for fixing the main shaft on a
wind turbine during the execution of installation and repair work
on heavy parts that are arranged in the nacelle on wind turbines,
with the fixture being divided up into a number of sections for
installation on stable structural parts that are found on a wind
turbine nacelle, including the bottom frame of the nacelle.
[0005] Up to now it has been necessary to halt the turbine, i.e.,
brake it and fix the rotor with a rotor lock, and then mount an
actual fixture to firmly hold the main shaft, subsequent to which
servicing of the components in the wind turbine nacelle is able to
take place. However, it is inappropriate to have to halt the
operation of the wind turbine while the mounting of the main shaft
fixture is taking place, as the standstill of the wind turbine
during the time that is spent to install the fixture involves a not
insignificant operating loss in the form of a lack of energy
produced (power). Furthermore, the known main shaft fixtures are
relatively inflexible in relation to shaft geometry, which means
that in practice nearly just as many different fixtures need to be
built and stored as there are shaft geometries that exist, which is
inappropriate. In addition, the use of self-hoisting cranes, whose
winches are placed on the ground surface near the turbine's tower,
is increasing, because the use of such involves large savings in
the level of expenses for servicing of wind turbines since the use
of large mobile cranes for handling the above-mentioned large and
heavy components is made superfluous. This causes however a need
for facilities for anchoring the self-hoisting crane with the
ground-based winch in the nacelle. However, the self-hoisting winch
requires furthermore the presence of a lightweight crane, for the
hoisting of snatch blocks, etc., that are to be anchored on/in the
nacelle or on the blades of the wind turbine, which poses
requirements concerning the facilities for mounting the lightweight
crane.
[0006] In the event of servicing in particular large wind turbines,
it may however be inappropriate to block the main shaft's rotation
with an actual rotor lock, but rather be appropriate to simply
retain the shaft in position and permit a certain rotation of the
shaft, which is possible by turning the blades/nacelle out of the
wind so that the shaft via the effects of the wind on the blades
only rotates very slowly, or not at all, whereby it is acceptable
in terms of safety, to perform service work in the nacelle of the
wind turbine concerned.
SUMMARY OF THE INVENTION
[0007] Thus, it is the purpose of the invention to specify a main
shaft fixture that provide a more universal application in relation
to shaft geometry, which moreover does not require halting and
fixing of the wind turbine main shaft, but which may however
comprise the means for such.
[0008] It is further the purpose of the invention to provide a main
shaft fixture that in addition offers facilities for the mounting
of a self-hoisting crane, with a ground-based winch.
[0009] It is by the invention realized that this is possible by a
main shaft fixture of the nature specified in the introduction,
which is characterized by that the main shaft fixture comprises at
least three radial displaceable pressure mandrels, substantially
symmetrical located around the center axis of the main shaft, the
ends of said pressure mandrels facing the main shaft are furnished
with a tap shoe, and said pressure mandrels being displaceable
between a passive, withdrawn lockable position where the tap shoes
are configured to be located at a distance from the surface of the
main shaft and an advanced lockable position where the tap shoes
are configured to be engaged with the main shaft.
[0010] Considerable flexibility is hereby attained with respect to
the main shaft fixture's use for the fixing of main shafts with
different geometries on wind turbines, since solely the degree of
mobility of the pressure mandrels and the size of the main shaft
fixture pose limiting factors for the usability of such. The main
shaft fixture is thus both usable for fixing of cylinder-shaped
shafts with different diameters and for the fixing of shafts with
conical shapes. The main shaft fixture according to the invention
is multi-part, and may be mounted on permanent structural parts,
preferably the bottom frame of the nacelle, while the rotor of the
wind turbine is in operation.
[0011] With the intent of being able to use a self-hoisting crane
with a ground-based winch together with the main shaft fixture
according to the invention, it may comprise mounting facilities for
a self-hoisting crane whose winch is placed on the ground surface
ground near the foot of the wind turbine.
[0012] The advance thereof is that the establishment of facilities
for the fixing of the wind turbine's main shaft, as well as the
establishment of mounting facilities for the self-hoisting crane
with a ground-based winch, take place simultaneously, which saves
work processes, and space, which are of great importance, as the
space in the nacelle in a wind turbine are most often narrow, and
furthermore the main shaft fixture as well as the mounting
facilities for a self-hoisting crane in the nacelle normally
utilize the same permanent structural parts in the nacelle for
anchoring.
[0013] With the intent of ensuring easy and rapid establishment of
the self-hoisting crane, which requires the hoisting of snatch
blocks with wires originating from the ground-based winch with a
lightweight crane which is mounted on stable structural parts in
the nacelle, the main shaft fixture may comprise mounting
facilities for a lightweight crane.
[0014] For the purpose of securing the rapid fixing of the main
shaft using the main shaft fixture according to the invention, the
pressure mandrels may be provided with actuators for displacing and
retaining the tap shoes in the passive position and the active
position, respectively, alternatively in a selectable position
between the passive and the active position.
[0015] Time is thereby saved in the displacement of the tap shoes
between the passive position, and the active position pressed
against the main shaft's surface.
[0016] In a more simple form of embodiment of the main shaft
fixture according to the invention, the pressure mandrels may be
comprised of threaded bolts whose free ends facing the main shaft
are furnished with tap shoes, where the threaded bolts work
together with threaded holes in relevant sections of the fixture.
The pressure mandrels with the tap shoes are hereby displaced by
manual turning of the threaded bolts between the passive position
and the active position.
[0017] With the intent of being able to permit rotation of the main
shaft during performance of servicing of a relevant wind turbine
and in order to protect the main shaft and the main shaft fixture,
slide plates may exist between the opposing sides of the main
shaft's surface and the tap shoes.
[0018] This enables the main shaft to be fixed in its position by
the main shaft fixture, but with the main shaft being permitted to
rotate without it being damaged due to the presence of the slide
plates.
[0019] In a first embodiment of the slide plates, this could
comprise the free ends of tap shoes facing against the main shaft
being furnished with slide plates, which in the active extended
position are engaged with the main shaft.
[0020] In a further embodiment, the main shaft fixture may
according to the invention comprise a multi-part slide plate
working in conjunction with the main shaft to be mounted on the
main shaft, where the multi-part slide plate in its mounted state
on the main shaft cooperates with the tap shoes.
[0021] This enables the tap shoes on the main shaft fixture's
pressure mandrel to slide directly on the multi-part slide plate,
in the event of a possible rotation of the main shaft caused by the
effects of wind on the blades. The tap shoes on the main shaft
fixture's pressure mandrels may cooperate with the multi-part slide
plate on the main shaft, with or without slideway linings on the
opposing sides of the tap shoes facing the main shaft.
[0022] In a further embodiment of the main shaft fixture as per the
invention, it may comprise a multi-part needle bearing, roller
bearing, ball bearing, consisting of a, multi-part inner ring,
fastened on the main shaft, and a therewith cooperating multi-part
outer ring consisting a number of bowed sub segments according to
the number of tap shoes mounted on the opposing side of the tap
shoes facing the multi-part inner ring, which in the advanced
active position of the pressure mandrels form the outer ring at a
distance from the external periphery of the multi-part inner ring,
and where a suitable number of needle rollers, rollers or balls are
placed between the inner ring and outer ring, and where means are
present for retaining the needles, rollers, or balls in position
between the inner ring and outer ring.
[0023] An actual temporary bearing connection is hereby formed
between the main shaft fixture and the main shaft, about which the
main shaft is able to rotate.
[0024] With the intent of being able to fix the rotor on the wind
turbine after it has been braked to a stop, the main shaft fixture
according to the invention, may comprise a rotor lock, for fixing
the wind turbine rotor.
[0025] In a preferred embodiment of the rotor lock, it is comprised
of a flange, whose bolt circle geometry corresponds to a bolt
circle geometry on the rotor, said flange element being fastened at
the ends to the first end of two first beam-shaped brackets
extending parallel with, and on each side of the main shaft, said
beam shaped brackets belonging to the main shaft fixture, and where
the other end of the brackets are pivotally mounted with
horizontally oriented bolt connections, on other brackets belonging
to the main shaft fixture, which are anchored on the bottom frame
of the nacelle.
[0026] It is hereby achieved that the rotor can be fixed by
introducing a bolt through one or more of the overlapping holes in
the bolt circles on the flange fastened to the bottom frame and the
bolt circle on the rotor, respectively.
[0027] With the intent of being able to perform replacement of the
shaft's main bearing, without being forced to dismount the main
shaft, the main shaft fixture may furthermore comprise at least a
second actuator, between the nacelle's bottom frame and the
opposing side of the first beam-shaped brackets facing such and the
nearest rotor lock, where the other actuator is movable between a
first passive outer position and an active outer position whereby
the flange element is moved vertically.
[0028] This enables the main shaft to be able to be raised from its
bearing hanging in the rotor lock, such that the main bearing of
the shaft can be replaced or serviced without the necessity of
removing the shaft from the nacelle.
[0029] The invention is explained in further detail in the
following with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0030] FIG. 1 is a perspective view of parts of a wind turbine
nacelle, presenting the nacelle bottom frame, the wind turbine main
shaft, and a main shaft fixture according to the invention, with a
lightweight crane and a self-hoisting crane mounted,
[0031] FIG. 2 is a more detailed perspective view from another
angle of what is shown in FIG. 1, where the main shaft is made
transparent, presenting the pressure mandrel with tap shoe
belonging to the main shaft fixture according to the invention,
[0032] FIG. 3 is a more detailed perspective view from another
angle of what is shown in FIG. 1, presenting the actuators for
raising the main shaft, where the main shaft is made
transparent,
[0033] FIG. 4 is a detailed perspective view of the main shaft
fixture for a wind turbine, where the tap shoes and the main shaft
are furnished with slide plates, and
[0034] FIG. 5 is a detailed perspective view or the main shaft
fixture for a wind turbine, where the slide plates are replaced by
a multi-part needle bearing/roller bearing/ball bearing formed of a
multi-part inner ring fastened to the main shaft and a therewith
cooperating multi-part outer ring consisting of bowed sub-segments
of the number of tap shoes mounted on the opposing side of the tap
shoes facing the inner ring.
DETAILED DESCRIPTION OF THE INVENTION
[0035] FIG. 1 shows a bottom frame 2 in a nacelle (not shown) on a
wind turbine (not shown), where the main shaft 4 of the turbine,
with a gear box 6 and a rotor 8, and where the main shaft fixture
10 according to the invention is shown in the mounted state,
bearing a lightweight crane 12 and a self-hoisting crane 14 with a
ground-based winch (not shown), respectively. The bottom frame 2
has for reasons of clarity been made transparent.
[0036] In the illustrated embodiment, the main shaft fixture 10 is
anchored to the bottom frame 2 near the gear box 6 and near the
rotor 8, and comprises a multi-part frame 14, which together with a
cross member 16 fastened on it encloses a part of the main shaft 4
between the rotor 8 and the gear box 6. The multi-part frame 14 is
anchored on the bottom frame 2.
[0037] FIG. 2 shows what is seen in FIG. 1, but in an end view,
seen from the rotor side of the shaft 4, and where the rotor 8 for
reasons of clarity has been made transparent. As it appears from
FIG. 2, the multi-part frame 14 and cross member 16 comprise in
total four pressure mandrels 18 symmetrically placed around the
main shaft 2, with tap shoes 20 that are engaged onto the main
shaft 4 in order to fix it in place.
[0038] The pressure mandrels 18 may be comprised of hydraulically
driven pistons whose free ends comprise the tap shoes 20, but may
also be executed in other manners, where they are moved manually
between the active position where the tap shoes 20 are engaged with
the main shaft 4 and the passive, withdrawn position.
[0039] As it appears from FIG. 3, the main shaft fixture 10
comprises two parallel passing first beams 22, one on each side of
the main shaft 4. In first ends of each first beam 22 nearest to
the rotor 8, a rotor lock is fastened in the form of a flange
element 24, the hole circle geometry 26 of which is similar to the
hole circle geometry 28 of the rotor 8 over part of the periphery
of the rotor. For locking of the rotor 8, the holes 7 in the rotor
8 and the holes 9 in the flange element 24 are brought to overlap,
and subsequently, bolts are inserted through the overlapping holes,
which are tightened with nuts, after which the rotor 8 is
fixed/locked by the flange element 24.
[0040] The other end of the parallel passing first beams 22 (that
nearest to the gear box 6) are pivotally anchored on horizontally
oriented bearing bolt 30, on a bracket 32, which is fastened to the
bottom frame 2. The parallel passing first beams 22 are mutually
connected with second cross members 34, on which bracket facilities
23 are seen for a self-hoisting crane 14 with a ground-based winch
(not shown).
[0041] As it appears in FIGS. 1 & 3, an actuator 36 is located
between the bottom frame 2 and the parallel passing first beams 22.
Activation of the actuator 36 will result in a change of the
distance between the bottom frame 2 and the first beams 22, in
which the flange element 24 is suspended, which will cause the
flange element 24 and the rotor 8 and thereby the main shaft 4 to
be raised, which will result in the possibility to replace the main
shaft's bearing 38 without the necessity of hoisting the main shaft
4 down to the ground, which is quite time-saving when the main
shaft bearing 38 has to be repaired or replaced.
[0042] In FIG. 1, it is moreover shown how the main shaft fixture
10 comprises mounting facilities 40 for the lightweight crane
12.
[0043] FIG. 4 shows an embodiment of the main shaft fixture
according to the invention, which is specially suited for use for
fixing the wind turbine main shaft 4 in position on the nacelle,
but where rotation of the main shaft 4 is possible, in the active
position of the pressure mandrels/tap shoes (18, 20), engaged with
the main shaft.
[0044] As shown in FIG. 4, a slideway 42, 44 is located between the
opposing sides of the tap shoes 20 facing the surface of the main
shaft 4.
[0045] The slideway may be comprised of slide plates 42 that are
fastened to the opposing free ends of the tap shoes 20 facing the
main shaft 4, which in their active advanced position are engaged
with the main shaft 4, but which alternatively may comprise a
multi-part slide plate 44 cooperative working with the main shaft
4, for mounting on the main shaft 4, said multi-part slide plate 44
in its mounted state on the main shaft 4 cooperates with the tap
shoes 20. It must be stated that the presence of the multi-part
slide plate 44 on the main shaft 4 does not necessarily exclude the
presence of the slide plates 42 and the tap shoes 20.
[0046] In a further embodiment, the main shaft fixture 10 is
comprised of a multi-part needle bearing/roller bearing/ball
bearing 46, formed of a multi-part inner ring 48 fastened on the
main shaft as well as, a cooperating multi-part outer ring 50
formed of bowed sub-segments 52 equal to the number of tap shoes
mounted on the opposing side of the tap shoes 20 facing the inner
ring 48, which in the advanced position of the pressure mandrels
form the outer ring 50 at a distance from the outer periphery of
the multi-part inner ring 48, and where an appropriate number of
needle rollers, rollers, or balls 54 (in the shown embodiment
rollers 54) are arranged between the inner ring 48 and the outer
ring 50, and where means (not shown) are present for retaining the
needles/rollers or balls (54) in position between the inner ring 48
and outer ring 50.
[0047] The means mentioned for fastening of needle
rollers/rollers/balls 54 may be formed of cooperating edge
delineators in opposing sides of the inner ring 48 and the outer
ring 50, alternatively as a means for holding between which the
needle rollers/rollers/balls 54 are fastened.
[0048] The presence of the slide plates 42, 44, alternatively the
multi-part needle bearing, roller bearing, ball bearing 46,
involves the main shaft 4 being permitted to rotate simultaneously
with it being fixed in its position during servicing of the wind
turbine, which can serve a purpose namely for larger wind
turbines.
[0049] The inventor has recognized that the main shaft fixture 10
can assume other embodiments than disclosed in the preceding and
shown in the figures, however such do not change the inventive
aspect that is comprised of specifying a main shaft fixture 10 of
the given type that comprises adjustable pressure mandrels 18 with
tap shoes 20, which causes the fixture 10 to be usable regardless
of the geometry of the main shaft 4 on a wind turbine, and thus
that such can be mounted without fixing the rotor 8 in place, and
furthermore of combining the main shaft fixture with facilities 40
for mounting of a lightweight crane 12 and a self-hoisting crane 14
with a ground-based winch, respectively, as well as a rotor lock 24
and finally of furnishing the main shaft fixture 10 with actuators
36, enabling the main shaft 4 and the main shaft bearing 38 to be
raised sufficiently from its bearing in the nacelle that it can be
serviced or replaced.
* * * * *