U.S. patent application number 12/754524 was filed with the patent office on 2011-06-02 for wind turbine installation vessel and a gravity center adjustment device thereof.
This patent application is currently assigned to SANY Electric Co., Ltd.. Invention is credited to Junlei Bai, Yanlin Li, Xinming Wang, Jialiang Wu.
Application Number | 20110126747 12/754524 |
Document ID | / |
Family ID | 43736247 |
Filed Date | 2011-06-02 |
United States Patent
Application |
20110126747 |
Kind Code |
A1 |
Wu; Jialiang ; et
al. |
June 2, 2011 |
WIND TURBINE INSTALLATION VESSEL AND A GRAVITY CENTER ADJUSTMENT
DEVICE THEREOF
Abstract
The present invention discloses a gravity center adjustment
device for a wind turbine installation vessel, with the gravity
center adjustment device (2) fixedly mounted to the outside of the
vessel body (4) of the wind turbine installation vessel. The
existence of the gravity center adjustment device (2) according to
the present invention is independent from the vessel body and no
longer limited by the size of the installation vessel and the size
of the ballast bank provided in the vessel body of the wind turbine
installation vessel. The size of the gravity center adjustment
device (2) may be set as desired so that the adjustment ability of
the gravity center adjustment device can be changed, whereby its
ability for adjusting gravity center of the wind turbine
installation vessel can be improved and the stability of the wind
turbine installation vessel can be improved. Therefore, the wind
turbine installation vessel can operate in an environment of poor
weather condition, so that the operation efficiency can be improved
and the cost of constructing a wind power plant on the offshore can
be reduced. The present invention also discloses a wind turbine
installation vessel including the above-mentioned gravity center
adjustment device (2).
Inventors: |
Wu; Jialiang; (Beijing,
CN) ; Wang; Xinming; (Beijing, CN) ; Li;
Yanlin; (Beijing, CN) ; Bai; Junlei; (Beijing,
CN) |
Assignee: |
SANY Electric Co., Ltd.
Beijing
CN
|
Family ID: |
43736247 |
Appl. No.: |
12/754524 |
Filed: |
April 5, 2010 |
Current U.S.
Class: |
114/63 ; 114/121;
114/124 |
Current CPC
Class: |
Y02E 10/727 20130101;
F03D 13/25 20160501; F03D 13/10 20160501; F05B 2240/932 20130101;
B63B 39/02 20130101; B63B 25/28 20130101; Y02E 10/72 20130101 |
Class at
Publication: |
114/63 ; 114/121;
114/124 |
International
Class: |
B63B 43/08 20060101
B63B043/08; B63B 43/04 20060101 B63B043/04; B63B 1/00 20060101
B63B001/00 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 27, 2009 |
CN |
200910237984.4 |
Claims
1. A gravity center adjustment device for a wind turbine
installation vessel, characterized in that, the gravity center
adjustment device is fixedly mounted to an outside of a vessel body
of the wind turbine installation vessel.
2. The gravity center adjustment device according to claim 1,
wherein the gravity center adjustment device comprises a mounting
rack, a counterweight and a height adjuster for adjusting a
relative height between the counterweight and the vessel body, with
the mounting rack mounted to the vessel body by a connecting
member, and the counterweight mounted to the mounting rack by the
height adjuster.
3. The gravity center adjustment device according to claim 2,
wherein the mounting rack comprises a horizontal installation
plate, and the counterweight is mounted to the horizontal
installation plate by the height adjuster.
4. The gravity center adjustment device according to claim 3,
wherein the height adjuster is a screw stem, and at least one of
the horizontal installation plate and the counterweight is provided
with a screw hole that corresponds to the screw stem.
5. The gravity center adjustment device according to claim 4,
wherein the screw hole comprises a first screw hole which is formed
in the counterweight, and a first end of the screw stem passes
through the first screw hole or connects with the first screw hole,
and is spaced from an upper surface of counterweight at an
appropriate distance, while a second end of the screw stem is
fixedly connected to the horizontal installation plate.
6. The gravity center adjustment device according to claim 3,
wherein the height adjuster is an oil cylinder, a piston barrel of
the oil cylinder is fixed to the horizontal installation plate, and
an end of a piston rod of the oil cylinder is fixedly connected
with the counterweight.
7. The gravity center adjustment device according to claim 5,
wherein the gravity center adjustment device is mount below the
vessel body.
8. The gravity center adjustment device according to claim 1,
wherein a plurality of the gravity center adjustment devices are
evenly arranged on left and right sides of the vessel body.
9. A wind turbine installation vessel, characterized by comprising
a gravity center adjustment device according to claim 1.
10. The wind turbine installation vessel according to claim 9,
wherein a bottom surface of the vessel body is of a planar
structure.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to Chinese Patent
Application No. 200910237984.4, filed Nov. 27, 2009, entitled "A
Wind Turbine Installation Vessel and A Gravity Center Adjustment
Device Thereof", which is incorporated by reference herein for all
purposes.
FIELD OF THE INVENTION
[0002] The present invention relates to an engineering machinery
field, in particular, to a gravity center adjustment device for a
wind turbine installation vessel. The present invention also
relates to a wind turbine installation vessel including the gravity
center adjustment device.
THE RELATED ART
[0003] With rapid development of economic construction, electric
energy has had more and more influence on economic construction and
people's life. As one of various electric power generation ways,
wind power generation has drawn people's more and more
attention.
[0004] The so-called wind power generation is an electric power
generation way in which kinetic energy of wind is converted into
mechanical energy which is then converted into electric energy.
Because offshore wind resource is very rich, more and more wind
power plants are being built on the offshore. During the wind power
plants are constructed on the offshore, the installation of wind
turbine (i.e., wind power generation unit) is an important
procedure, which is typically implemented by means of a wind
turbine installation vessel. The installation of wind turbine means
that the wind turbine is installed onto a wind turbine installation
base which is pre-set on the offshore.
[0005] In the prior art, there are mainly two kinds of wind turbine
installation ways, i.e., integral type installation and split type
installation.
[0006] The integral type installation is an installation way in
which the wind turbine is assembled at the dock or the like and
then transported to the wind power plant so that the whole wind
turbine is installed in position at a time, which is generally
carried out by means of an integral installation vessel (floating
crane vessel). The integral installation vessel includes a vessel
body and a hoisting device provided on the vessel body. The
hoisting device includes a hanging hook that is connected by steel
wire ropes, whereby the hoisting of the wind turbine is achieved by
the hanging hook.
[0007] During the operation, after the integral installation vessel
arrives at a pre-determined location, the integral installation
vessel is roughly positioned through dropping an anchor. Then, the
assembled wind turbine, which is transported from the dock by a
transporting vessel, is hoisted and installed onto the wind turbine
installation base.
[0008] The split type installation is an installation way in which
the tower, nacelle and rotor of the wind turbine are installed on
the wind turbine installation base in turn, which is generally
carried out by means of a split installation vessel. The split
installation vessel is substantially same as the integral
installation vessel in structure, except that legs for fixing to
the vessel body are added.
[0009] During the operation, after the split installation vessel
arrives at a pre-determined location, the split installation vessel
is roughly positioned through dropping an anchor and is then
supported by the legs and hoisted by a hoisting device.
[0010] During the installation of wind turbine by the integral
installation vessel, the gravity center of the vessel displaces as
a result of the displacement of the wind turbine. Meanwhile, in
order to keep the installation vessel stable, it is generally that
water is injected into an ballast bank formed in the installation
vessel, thereby realizing the purpose of varying the gravity center
of the wind turbine installation vessel.
[0011] However, on one hand, the ability of adjusting the gravity
center of the wind turbine installation vessel is limited due to
the limited size of the wind turbine installation vessel and the
limited space of the ballast bank formed in the vessel body; on the
other hand, in the case of adjusting the gravity center of the wind
turbine installation vessel by injecting water into the ballast
bank of the wind turbine installation vessel, the gravity center of
the wind turbine installation vessel will always be on the vessel
body or above the vessel body, and it is impossible that the
gravity center of the wind turbine installation vessel would be
below the vessel body, which limits the ability of adjusting the
gravity center of the wind turbine installation vessel, and
particularly, which is far from meeting the actual requirement in
the case that the weather condition is poor and the gravity center
of the wind turbine installation vessel is required to be lowered
in order to improve the stability of the wind turbine installation
vessel.
[0012] Therefore, how to improve the ability of adjusting the
gravity center of the wind turbine installation vessel and improve
the stability of the wind turbine installation vessel is becoming a
technical problem that needs to be addressed by those skilled in
the art.
SUMMARY OF THE INVENTION
[0013] An object of the present invention is to provide a gravity
center adjustment device, which has an improved ability of
adjusting a gravity center of a wind turbine installation vessel so
as to improve stability of the wind turbine installation vessel.
Another object of the present invention is to provide a wind
turbine installation vessel including the gravity center adjustment
device.
[0014] To address the above technical problem, the invention
provides a gravity center adjustment device for a wind turbine
installation vessel, which is fixedly mounted to an outside of a
vessel body of the wind turbine installation vessel.
[0015] Preferably, the gravity center adjustment device includes a
mounting rack, a counterweight and a height adjuster for adjusting
a relative height between the counterweight and the vessel body,
with the mounting rack mounted to the vessel body by a connecting
member, and the counterweight mounted to the mounting rack by the
height adjuster.
[0016] Preferably, the mounting rack includes a horizontal
installation plate and the counterweight is mounted to the
horizontal installation plate by the height adjuster.
[0017] Preferably, the height adjuster is a screw stem, and at
least one of the horizontal installation plate and the
counterweight is provided with a screw hole that corresponds to the
screw stem.
[0018] Preferably, the screw hole includes a first screw hole which
is formed in the counterweight. A first end of the screw stem
passes through the first screw hole or connects with the first
screw hole, and is spaced from an upper surface of the
counterweight at a certain distance, while a second end of the
screw stem is fixedly connected to the horizontal installation
plate.
[0019] Preferably, the height adjuster is an oil cylinder, a piston
barrel of the oil cylinder is fixed to the horizontal installation
plate, and an end of a piston rod of the oil cylinder is fixedly
connected with the counterweight.
[0020] Preferably, the gravity center adjustment device is mounted
below the vessel body.
[0021] Preferably, a plurality of the gravity center adjustment
devices are evenly arranged on left and right sides of the vessel
body.
[0022] The invention also provides a wind turbine installation
vessel, which includes any one of the gravity center adjustment
devices described above.
[0023] Preferably, a bottom surface of the vessel body is of a
planar structure.
[0024] The gravity center adjustment device according to the
present invention is used for the wind turbine installation vessel
and fixedly mounted to the outside of the vessel body of the wind
turbine installation vessel. When the wind turbine installation
vessel is subjected to the influence of weather conditions and
operation states and it is required to adjust the gravity center of
the wind turbine installation vessel, the adjustment can be made by
the gravity center adjustment device fixedly mounted to the outside
of the vessel body of the wind turbine installation vessel. It can
be seen that the existence of the gravity center adjustment device
according to the present invention may be independent from the
vessel body and no longer limited by the size of the wind turbine
installation vessel and the size of the ballast bank provided in
the vessel body of the wind turbine installation vessel. The size
of the gravity center adjustment device may be set as desired so
that the adjustment ability of the gravity center adjustment device
can be changed, whereby its ability of adjusting the gravity center
of the wind turbine installation vessel can be improved and the
stability of the wind turbine installation vessel can be improved.
Therefore, the wind turbine installation vessel can operate in an
environment of poor weather condition, so that the operation
efficiency can be improved and the cost of constructing a wind
power plant on the offshore can be reduced.
[0025] In a preferred embodiment, the gravity center adjustment
device according to the present invention includes the mounting
rack, the counterweight and the height adjuster for adjusting the
relative height between the counterweight and the vessel body, with
the mounting rack mounted to the vessel body by the connecting
member, and the counterweight mounted to the mounting rack by the
height adjuster. When the adjustment of the gravity center of the
wind turbine installation vessel is performed, the relative height
between the counterweight and the vessel body is adjusted by the
height adjuster to change the height of the counterweight, thereby
achieving the adjustment of the gravity center of the wind turbine
installation vessel in such a way that the position of the gravity
center can meet installation requirements of the wind turbine, so
that the stability of the wind turbine installation vessel can be
improved and the installation efficiency can be improved. The
arrangement of the mounting rack, the counterweight and the height
adjuster not only simplifies the process of adjusting the gravity
center of the wind turbine installation vessel, but also has a
higher adjustment speed compared with the situation of injecting
water into the ballast bank of vessel body. On the other hand, the
counterweight for matching the wind turbine installation vessel may
be selected according to the working environment and the size of
the wind turbine installation vessel, so as to meet the
requirements on the adjustment of the gravity center of the wind
turbine installation vessel under different working conditions,
thereby further enhancing the ability of adjusting the gravity
center of the wind turbine installation vessel and improving the
adaptability of the wind turbine installation vessel.
[0026] In another preferred embodiment, the bottom surface of the
vessel body of the wind turbine installation vessel according to
the present invention is of the planar structure. The bottom
surface of the vessel body with the planar structure can stay
aground in a region with relatively lower water depth and in the
situation of relatively lower water level. Thus, the wind turbine
installation vessel can operate in an intertidal zone in such a way
that it stays aground during ebb tide and it sails during flood
tide, so that the applying range of the wind turbine installation
vessel can be enlarged and the adaptability of the wind turbine
installation vessel can be improved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] FIG. 1 is a schematic perspective view of an embodiment of a
wind turbine installation vessel according to the present
invention;
[0028] FIG. 2 is a schematic side view of the embodiment of the
wind turbine installation vessel according to the present
invention;
[0029] FIG. 3 is a schematic plan view of the embodiment of the
wind turbine installation vessel according to the present
invention;
[0030] FIG. 4 is a schematic perspective view of an embodiment of
the gravity center adjustment device according to the present
invention.
DETAILED DESCRIPTION OF THE INVENTION
[0031] The kernel of the present invention is to provide a gravity
center adjustment device, which has an improved ability of
adjusting the gravity center of a wind turbine installation vessel
so as to improve stability of the wind turbine installation vessel.
Another kernel of the present invention is to provide a wind
turbine installation vessel including the gravity center adjustment
device.
[0032] In order that those skilled in the art can understand the
technical solution of the present invention better, the present
invention will be explained in further detail hereinafter with
reference to the accompanying drawings and embodiments.
[0033] Reference is firstly made to FIGS. 1-3, wherein FIG. 1 is a
schematic perspective view of an embodiment of a wind turbine
installation vessel according to the present invention, FIG. 2 is a
schematic side view of the embodiment of the wind turbine
installation vessel according to the present invention, and FIG. 3
is a schematic plan view of the embodiment of the wind turbine
installation vessel according to the present invention.
[0034] As shown in the Figures, in one embodiment, a gravity center
adjustment device 2 according to the present invention is mounted
to an outside of a vessel body 4 of the wind turbine installation
vessel. The outside as discussed herein means that the gravity
center adjustment device 2 is located at the periphery of the
vessel body 4, including around and below the vessel body, rather
than being located inside or above the vessel body 4.
[0035] The Figures show a particular wind turbine installation
vessel equipped with the gravity center adjustment device 2
according to the present invention. The turbine installation vessel
includes a vessel body 4, an upright column 3 mounted on the vessel
body 4, an enclasping mechanism 6 mounted to the upright column 3,
an anchoring mechanism 5 mounted at the four corners of the vessel
body 4 for fixing the vessel body 4, and the gravity center
adjustment device 2 that is fixedly mounted to the vessel body 4,
with the gravity center adjustment device 2 located at the outside
of the vessel body 4. The vessel body 4 is provided thereon with
movement rails for the upright column 3, which are perpendicular to
each other, so that the upright column 3 can move along the rails
under the effect of its motorization member, thereby realizing the
transverse and longitudinal movement of the wind turbine 7 on the
vessel body 4. U-shaped openings are formed in front and rear ends
of the vessel body 4 so that the wind turbine 7 can be mounted onto
a wind turbine base through these openings. Of course, the wind
turbine installation vessel may also have the other structure. What
is described herein is only one exemplified embodiment and cannot
be used as any limitation on the structures other than the gravity
center adjustment device 2.
[0036] During operation, the wind turbine is assembled at the dock,
and then the assembled wind turbine is installed on the vessel body
4 of the wind turbine installation vessel by means of a hoisting
device, such as a crane, and enclasped by the enclasping mechanism
6. Since such wind turbine installation vessel does not have any
traction device, a traction vessel 1 is required in order to move
the wind turbine installation vessel to an offshore wind power
plant. After arriving at the offshore wind power plant, the
traction vessel 1 draws the wind turbine installation vessel to a
position of the base of the wind turbine 7 corresponding to the
U-shaped openings. Then, the anchoring mechanism 5 drops an anchor
to roughly fix the wind turbine installation vessel. Meanwhile, the
upright column 3, the enclasping mechanism 6 mounted on the upright
column 3 and the wind turbine 7 enclasped by the enclasping
mechanism 6 are moved to the U-shaped openings under the effect of
the motorization device, and then hoisted above the base by the
hoisting mechanism provided inside the upright column 3. Next, the
wind turbine 7 and the base are fixedly connected under the
cooperative effect of the motorization device and the hoisting
mechanism. Thereafter, the enclasping mechanism 6 and the upright
column 3 are moved away and finally, the installation platform for
the wind turbine 7 is moved away. During the installation of the
wind turbine, in order to ensure that the installation process goes
smoothly, the gravity center adjustment device 2 according to the
present invention is located at the outside of the vessel body 4 so
that the gravity center position of the wind turbine installation
vessel can be adjusted as desired, thereby achieving a convenient
adjustment of the gravity center and providing a better working
environment for the installation of the wind turbine 7.
[0037] It can be seen that, since the gravity center adjustment
device according to the present invention is located outside of the
vessel body, the existence of the gravity center adjustment device
is independent from the vessel body and no longer limited by the
size of the wind turbine installation vessel and the size of the
ballast bank provided in the vessel body 4 of the wind turbine
installation vessel. The size of the gravity center adjustment
device 2 may be set as desired so that the adjustment ability of
the gravity center adjustment device 2 can be changed, whereby its
ability of adjusting the gravity center of the wind turbine
installation vessel can be improved and the stability of the wind
turbine installation vessel can be improved. Therefore, the wind
turbine installation vessel can operate in an environment of poor
weather condition, so that the operation efficiency can be improved
and the cost of constructing a wind power plant on the offshore can
be reduced.
[0038] Reference is now made to FIG. 4, which is a schematic
perspective view of an embodiment of the gravity center adjustment
device according to the present invention.
[0039] In the embodiment, the gravity center adjustment device 2
according to the present invention may include a mounting rack 21,
a counterweight 23 and a height adjuster 22 for adjusting a
relative height between the counterweight 23 and the vessel body 4,
with the mounting rack 21 mounted to the vessel body 4 by a
connecting member, and the counterweight 23 mounted to the mounting
rack 21 by the height adjuster 22. Specifically, the connecting
member may be a bolt. Accordingly, a screw hole is provided at a
corresponding position of the vessel body 4.
[0040] The counterweight 23 may have a stepped structure so as to
be easily mounted to the mounting rack 21 by the height adjuster
22. The counterweight 23 may be machined into other shapes as
desired. In general, the material of the counterweight 23 may be
steel, or other materials with a larger density than water. Of
course, the specific shape and the used material are not limited to
what have been described herein. Any shape and material that can
meet the functional requirements may be selected.
[0041] When the adjustment of gravity center of the wind turbine
installation vessel is performed, the relative height between the
counterweight 23 and the vessel body 4 is adjusted by the height
adjuster 22 to change the height of the counterweight 23, thereby
achieving the adjustment of gravity center of the wind turbine
installation vessel in such a way that the position of the gravity
center can meet installation requirements of the wind turbine, so
that the stability of the installation vessel can be improved and
the installation efficiency can be improved.
[0042] In this way, the arrangement of the mounting rack 21, the
counterweight 23 and the height adjuster 22 not only simplifies the
process of adjusting the gravity center of the wind turbine
installation vessel, but also has a higher adjustment speed
compared with the situation of injecting water into the ballast
bank of vessel body. On the other hand, the counterweight 23 for
matching the wind turbine installation vessel may be selected
according to the working environment and the size of the wind
turbine installation vessel, so as to meet the requirements on the
adjustment of the gravity center of the wind turbine installation
vessel under different working conditions, thereby further
enhancing the ability for adjusting the gravity center of the wind
turbine installation vessel and improving the adaptability of the
wind turbine installation vessel.
[0043] Specifically, the mounting rack 21 of the gravity center
adjustment device 2 according to the present invention may include
a horizontal installation plate 211. The counterweight 23 may be
mounted to the horizontal installation plate 211 by the height
adjuster 22.
[0044] The fact that the counterweight 23 is mounted to the
horizontal installation plate 211 by the height adjuster 22 not
only facilitates installation of the counterweight 23, but also
makes the height adjuster 22 adjust the vertical position of the
counterweight 23 more conveniently, so that the variation of the
position of the counterweight 23 in the vertical direction is more
apparent, thus further improving the efficiency of adjusting
gravity center in the vertical direction.
[0045] In one embodiment, the height adjuster 22 of the gravity
center adjustment device 2 according to the present invention may
be a screw stem, and at least one of the horizontal installation
plate 211 and the counterweight 23 is formed with a screw hole that
corresponds to the screw stem. In this way, the height position of
the counterweight 23 can be changed by rotating the screw stem in
the screw hole, whereby realizing the adjustment of the height
position of the gravity center of the wind turbine installation
vessel. The screw stem is simple in structure and low in cost,
which reduces the cost of the gravity center adjustment device
2.
[0046] Specifically, the counterweight 23 may be formed with a
first screw hole. A first end of the screw stem passes through the
first screw hole or connects with the first screw hole, and is
spaced from an upper surface of counterweight 23 at a certain
distance, while a second end of the screw stem is fixedly connected
to the horizontal installation plate 211. In this way, during the
adjustment of the height position of the counterweight 23, the
counterweight 23 can move upwardly along the screw stem in the
vertical direction through rotating the counterweight 23. This is a
quite simple adjustment process. Meanwhile, whether the first end
of the screw stem passes through the first screw hole or connects
with the first screw hole is specifically determined according to
the length of the screw stem and the thickness of the counterweight
23 in the vertical direction. If the screw is relatively long and
the thickness of the counterweight 23 in the vertical direction is
relatively thin, the first end passed through the first screw hole
of the counterweight 23; otherwise, the first end connects with the
first screw hole of the counterweight 23.
[0047] Of course, the first end of the screw stem may be fixed to
the counterweight 23 while the second end passes through or
connects with the screw hole formed in the horizontal installation
plate 211, or both ends of the screw stem are threadedly connected
with the counterweight 23 and the horizontal installation plate
211, respectively, as long as the functional requirements can be
met.
[0048] In another embodiment, the height adjuster 22 according to
the present invention may be an oil cylinder. A piston barrel of
the oil cylinder is fixed to the horizontal installation plate, and
an end of a piston rod of the oil cylinder is fixedly connected
with the counterweight 23. With the protrusion and retraction of
the piston rod of the oil cylinder, the height of the counterweight
23 can be changed so that the gravity center position of the wind
turbine installation vessel can be adjusted. The oil cylinder is
mature in structure, easy to operate and highly reliable, making it
easy to realize the adjustment of gravity center position of the
wind turbine installation vessel.
[0049] For facilitating installation of the gravity center
adjustment device 2, the gravity center adjustment device 2 may be
installed below the vessel body 4, depending on the structure of
the wind turbine installation vessel. Of course, the gravity center
adjustment device 2 may be installed on left and right sides of the
vessel body 4. Meanwhile, a plurality of gravity center adjustment
devices 2 may be arranged evenly around the vessel body 4. In this
way, the gravity center adjustment devices 2 may also be made
having different heights so as to adjust, in a certain extent, the
gravity center position of the wind turbine installation vessel in
the horizontal direction.
[0050] In addition to the above discussed gravity center adjustment
device, the present invention also provides a wind turbine
installation vessel including the above-mentioned gravity center
adjustment device. With respect to the structure of other parts of
the wind turbine installation vessel, it may refer to the prior
art. The description of these parts is omitted herein.
[0051] In one embodiment, the bottom surface of the vessel body 4
of the wind turbine installation vessel according to the present
invention is of the planar structure. The bottom surface of the
vessel body 4 with the planar structure can stay aground in a
region with relatively lower water depth and in the situation of
relatively lower water level. Thus, the wind turbine installation
vessel can operate in an intertidal zone in such a way that it
stays aground during ebb tide and it sails during flood tide, so
that the applying range of the wind turbine installation vessel can
be enlarged and the adaptability of the wind turbine installation
vessel can be improved.
[0052] The wind turbine installation vessel and gravity center
adjustment device according to the present invention have been
described in detail hereinbefore. Some exemplified examples arc
used to explain the principle and embodiments of the present
invention herein, and the explanation of these examples only serves
to help understand the method and kernel ideas of the present
invention. It is noted that the present invention can be varied and
modified by those with ordinary skills in the art, under the
premise of being not departed from the principle of the invention.
Those variation and modifications also fall within the scope of
protection defined by the appended claims.
* * * * *