TW201814157A - Installation system of offshore wind turbine and installation method thereof characterized by lowering the cost of installation and providing the efficiency and convenience of installation - Google Patents

Abstract

Disclosed are an installation system of offshore wind turbine and an installation method thereof. The wind turbine is assembled on the shore; and the installation is completed by horizontally swinging a boom on the shore and scrolling a hoisting cable to hoist components. The loading of the wind turbine before being sailed in the sea is completed by using the boom to move the entire wind turbine to a predetermined position; then two towers of a platform on the sea are lifted by a lifting appliance; and the two towers follow a slide table to linearly slide so as to make the wind turbine moved to be positioned at a placement area of the platform. When the platform sails on the sea to a fixed point of the installation, the two towers use the lifting appliance again to lift the wind turbine located at the placement area, and the two towers follow the slide table to linearly slide so as to make the lifted wind turbine moved out the placement area and installed at the fixed point, thereby completing the installation of the wind turbine on the sea.

Description

Installation system and installation method of offshore wind generator

The invention relates to wind power generation, in particular to an offshore wind turbine installation system and an installation method thereof.

As shown in FIG. 16, a conventional wind turbine mainly includes a body 91, blades 92, and columns 93, which are usually installed on the shore of a seashore. The blades 92 are rotated by the sea wind to make the body 91 generate electricity and store energy. The other is to install the wind generator offshore and install it on the sea surface, which can obtain the strong wind power generation advantage without occupying the space available on land.

If the aforementioned wind turbine is an offshore installation, due to its large size and limited carrying equipment, it is difficult to carry the whole machine to the sea for installation. As shown in Figure 17, usually several tools The wind turbine's body 91, blades 92, and pillars 93 are disassembled and fixed on the installation boat 94, and then carried by the installation boat 94 to a fixed point at sea, and the wind turbine is hoisted by a person operating the installation boat 94. Hang to a fixed point for step-by-step installation. However, the installation of wind turbines on the sea is quite inconvenient and highly dangerous compared to those carried on shore.

To transport the wind turbine to a fixed point on the sea, the wind turbine is first assembled on the shore, and then the assembled wind turbine is lifted by a floating crane dedicated to hanging at sea. Carry to the aforementioned fixed point. However, the above floating cranes are usually equipped with a single boom on the hull, because there is only a single point at the joint of the hull, and the wind turbine to be suspended is large and heavy, and must be suspended with the boat The body must maintain a proper distance and have a certain length, so the boom must have considerable requirements in terms of structural strength, resulting in very expensive construction costs. Therefore, for the unit responsible for installing a wind turbine, it is usually not caused by a wind turbine. Purchasing a floating crane specifically for the needs of offshore installation, even if it is leased, it will cost a lot of rent. Although the floating crane has a high installation efficiency, it is still not the first choice due to the consideration of installation cost. .

Therefore, how to solve the problem of offshore installation of conventional wind turbines is the focus of the present invention.

The main purpose of the present invention is to solve the above problems and provide an offshore wind turbine installation system and an installation method thereof. The main purpose is to reduce the cost required for offshore installation of a wind turbine, and to provide installation efficiency and convenience.

The aforementioned wind power generator is a body equipped with a plurality of blades provided at the top of a pillar, and the body can generate electricity when the plurality of blades are driven by wind to rotate. To achieve the foregoing, the installation system includes:

A shore hoisting unit has a first tower on the shore, a boom which can be driven to swing horizontally at the top of the first tower, and a first hoist fixed to the first tower. In this position, the boom has two first fixed pulleys at the same level at the same level and separated by a distance. A pair of first slings can be connected to the first hoist at one end by scrolling, and respectively pass around the Two first fixed pulleys hang down toward the ground, and each of the first slings has a first sling at the aforementioned hanging end;

An offshore lifting unit has a platform that can be navigable at sea. The platform has pillars that can be extended to the bottom of the sea and fixed to the sea floor. There are a pair of slides on both sides of the symmetrical platform that can slide in parallel on the platform. There is a placement area between the pair of slides. Each of the slides has a second tower on the top that can extend beyond the platform. Each second tower has a second hoist at its location. The second towers on the same side can extend from the top of the platform with a second fixed pulley, the two second fixed pulleys are at the same level on both sides of the placement area, and each second tower has a second The sling is connected to the second hoist of the second tower with one end by scrolling, and can pass down the platform after passing the second fixed pulley of the second tower. The hanging end has a second spreader;

A hanging piece can be fixed on the pillar of the wind generator for the combination of the two first spreaders to lift the wind generator and move on the shore along with the horizontal rotation of the boom; or for the The combination of two second spreaders can also lift the aforementioned wind turbine, and slide linearly along the sea with the two second towers.

Wherein, the boom is rotatably provided on the first tower base with a rotating shaft, the first tower base has an annular cushion body under the boom, and a guide sliding part at the bottom of the boom is slidably carried on the The first tower base is provided with a ring-shaped clamp seat, and a plurality of hydraulic cylinders are respectively movable at one end but can be temporarily fixedly connected to the base body. The clamp base is connected to the boom at the other end, and the boom can be gradually rotated on the first tower base by a plurality of hydraulic cylinders.

Wherein, on the platform, a pair of slide paths corresponding to each of the slide tables slides straight on the platform. There are a pair of outward guide rails and a pair of inward clamp holders. The pair of guide rails and the pair of clamp holders are linear and are arranged in parallel on the platform. The bottom of each slide table is slidably provided on the pair of guide rails; each pair of clamps has a plurality of hydraulic cylinders which are movable at one end but can be temporarily fixedly connected, and the other end of each hydraulic cylinder is connected to the slide table, each The slide table can be gradually pushed by the connected hydraulic cylinders to slide linearly on the platform.

Wherein, the cross section of the clamp seat is in an I-shape, and each of the hydraulic cylinders has a clamp at one end connected to the clamp seat, which is movably arranged on the top of the clamp seat. The clamp can be temporarily fixed by being supported by the plurality of clamp cylinders on the clamp base, or can be moved on the clamp base by loosening the clamp base.

Wherein, the two second towers are provided with a cushion across the two second towers on the side provided with the second fixed pulley, and a cable with a weight block is connected to the first and second ends of the second tower. Two towers and the hanging piece; when the two second towers use the two second spreaders to lift the aforesaid wind turbine and slide, the cushion is used to abut the column of the wind turbine during the sliding, and When the set weight sinks, the cable pulls the hanger toward the cushion, so that the wind turbine during sliding will not shake.

There is a base plate on the top of each of the second towers, and a slide plate is provided on the base plate. The second fixed pulley is provided on the slide plate. One side of the slide plate is connected to a hydraulic cylinder on the base plate. The slide plate is pushed to slide linearly on the base plate in the axial direction of a second fixed pulley. The slide plate has a first perforation for passing a second sling passing through the second fixed pulley when it is suspended. The substrate has a second perforation which can communicate with the first perforation when the sliding plate slides linearly.

Wherein, the hanging piece includes a combination piece and a pair of hooks, the combination piece has a perforation for the pillar of the wind turbine, and an outer periphery of the pillar has a stopper that can be supported on the binding piece. Loop, the coupling piece has a plurality of first hook portions on opposite sides; each of the hooks can be hooked on the two second spreaders, and each of the hooks has a plurality of second hook portions on one side to be combined with the hook The plurality of first hooks on either side of the piece hook each other.

The first crane has a movable pulley, and a hook is provided below the movable pulley. After the first sling is suspended by the first stationary pulley, it passes around the movable pulley and then back to the first stationary pulley several times. To position an end of the first sling on the aforementioned first sling; the coupling is provided with a sling, and the first sling is connected to the sling by a sling to suspend the wind turbine.

The second crane has a movable pulley, and a hook is provided below the movable pulley. After the second sling is suspended by the second stationary pulley, it passes around the movable pulley and then back to the second stationary pulley several times. To position an end of the second sling on the aforementioned second sling.

Wherein, the onshore lifting unit is provided with a retaining wall on the ground around the first tower base, and the wind power generator lifted by the first spreader can be restrained in the retaining wall by the bottom end of its pillar.

Wherein, the first tower is provided with a water tank for its first spreader to lift the wind turbine; the two second towers are respectively equipped with a second spreader for its second spreader to lift the wind turbine Heavy water tank.

To achieve the foregoing object, the method for installing a wind turbine at sea by the installation system includes:

Assembly on shore: the first sling rolled by the first hoist is used to lift the aforesaid body, blades and uprights with the first spreader provided, and cooperate with the boom to be driven on the first tower to rotate horizontally Pendulum to complete the aforesaid wind turbine on shore;

Loading before going to the sea: the assembled wind turbine is moved to a standby position on the shore by the swing of the boom, and the platform is moved to the aforementioned shore at sea by the platform, which is rolled by the second hoist The second sling is used to lift the wind turbine at the prepared position by the second spreader, and the second and second towers are linearly slid along with the sliding platform to move the lifted wind turbine to the position. The placement area is positioned and provided in the placement area with a horizontal support to secure the wind turbine; and

Fixed-point installation at sea: When the platform is sailed at sea to the fixed point of installation, the two second towers and the second spreader are used to lift the wind turbines located in the placement area as described above. The two towers move the lifted wind turbine out of the placement area along with the linear sliding of the sliding platform, and install the wind turbine at the aforementioned fixed point to complete the installation of the wind turbine at sea.

The above and other objects and advantages of the present invention can be easily understood from the detailed description and accompanying drawings of selected embodiments below.

Of course, the present invention may be different in some other parts or arrangements of other parts, but the selected embodiment is described in detail in this specification and its structure is shown in the drawings.

Please refer to FIG. 1 to FIG. 15, which show the structure of the embodiment of the present invention for the purpose of illustration, and are not limited by such structures in patent applications.

This embodiment provides an offshore wind turbine installation system and an installation method thereof. As shown in FIG. 1, a wind turbine 1 is a body 11 provided with a plurality of blades 12, and the body 11 is provided on the top of a pillar 13, and the body 11 Electricity can be generated when the plurality of blades 12 are rotated by wind. The installation system includes an onshore lifting unit 2, an offshore lifting unit 3, and a hanger 4 as shown in FIG. 1, wherein:

As shown in Fig. 1, the shore hoisting unit 2 has a first tower 21 located on the shore, a boom 22 which can be driven to swing horizontally at the top of the first tower 21, and a first hoist 23 is fixed to the position of the first tower base 21 (in this embodiment, it is located at the bottom of the first tower base 21). As shown in Figures 1 and 2, the boom 22 has two first fixed pulleys 221 at the same level and separated by a distance, and a pair of first slings 24 are connected to the first at one end by scrolling. The hoisting machine 23 is suspended toward the ground after passing through the two first fixed pulleys 221, and each of the first slings 24 has a first sling 25 at the aforementioned suspended end.

As shown in Figures 1 to 3, the offshore lifting unit 3 has a platform 31 capable of navigating at sea. The platform 31 has pillars 32 that can be extended to the sea floor and fixed to the sea floor, and a pair of slides on the symmetrical sides. 33 can slide linearly in parallel on the platform 31, and there is a placement area 34 between the pair of slide tables 33 (please refer to FIG. 7). Each slide table 33 has a second tower 35, and each second The top of the tower base 35 can extend beyond the platform 31, and the second tower base 35 has a second hoist 36 (located on the slide table 33 in this embodiment). As shown in Figures 1 and 3, the second and second towers 35 on the same side can protrude from the top of the platform 31 with a second fixed pulley 351, and the second and second fixed pulleys 351 are on the same side of the placement area 34. At a horizontal level, each second tower 35 has a second sling 37 that is connected to the second hoist 36 of the second tower 35 at one end by a scroll, and passes around the second of the second tower 35 The fixed pulley 351 can hang down toward the platform 31, and each second sling 37 has a second sling 38 at the aforementioned suspended end.

As shown in FIGS. 1, 3 and 4, the hanger 4 can be fixed to the pillar 13 of the wind turbine 1 described above, and the two first spreaders 25 can be combined to lift the wind turbine 1 and follow the boom 22. It can be horizontally swung and displaced on the shore; the hanger 4 can also be combined with the second and second spreader 38 (shown as the hook portion 382 shown in the figure), and the wind turbine 1 can also be hoisted and follow the second and second towers. The seat 35 slides straight in the sea.

As shown in FIGS. 2 and 5, the boom 22 of this embodiment is rotatably provided on the first tower base 21 with a rotating shaft 222. The first tower base 21 has an annular cushion body 211 under the boom 22, and the boom A guide part 223 is slidably carried on the cushion body 211 at the bottom of 22, and the suspension arm 22 can be supported to swing on the first tower base 21. The first tower base 21 is also provided with a ring-shaped clamp base 212. The plurality of hydraulic cylinders 26 are respectively movable at one end but temporarily fixedly connected to the clamp base 212, and the other end is connected to the boom 22, as in the second and sixth parts. The action shown in the figure is reciprocated, and the plurality of hydraulic cylinders 26 can gradually push the boom 22 to rotate on the first tower base 21.

As shown in Figs. 7 to 9, on the platform 31 of this embodiment, the path corresponding to each slide table 33 linearly slides is a pair of outward guide rails 311 and a pair of inward clamp holders 312. The pair of guide rails 311 and the The clamp bases 312 are linear and are arranged in parallel on the platform 31. The bottom of each slide table 33 is slidably provided on the pair of guide rails 311. Each clamp base 312 has a plurality of hydraulic cylinders 39 which are movable at one end but can be temporarily fixed. Ground connection, and the other end of each hydraulic cylinder 39 is connected to the slide table 33, each slide table 33 is reciprocated as shown in Figures 9 and 10, and can be gradually pushed by the connected multiple hydraulic cylinders 39 to be straight on the platform 31 Slip.

As shown in FIG. 11, the cross section of the clamp base 212 has an I-shape. Each hydraulic cylinder 26 has a clamp 261 at the end connected to the clamp base 212. The clamp 261 is movably arranged on the top of the clamp base 212. The cylinder 262 and the clamp 261 can be temporarily fixed by being clamped on the clamp base 212 by a plurality of clamp cylinders 262 therein, or can be moved on the clamp base 212 by loosening the clamp base 212. As shown in FIG. 11, the cross section of the clamp base 312 is also in an I-shape. Each hydraulic cylinder 39 has a clamp 391 at one end connected to the clamp base 312 and is movably arranged on the top of the clamp base 312. The clamp 391 There is a plurality of clamp cylinders 392, and the clamp 391 can be temporarily fixed by being clamped on the clamp base 312, or can be moved on the clamp base 312 by loosening the clamp base 312.

As shown in Figures 1, 3, and 12, the second and second towers 35 are provided with a cushion 352 across the second and second towers 35 on the side provided with the second fixed pulley 351, and a counterweight A cable 354 of 353 is connected to the second tower 35 and the hanger 4 at both ends. The wind turbine 1 during slippage will not shake.

As shown in FIGS. 14 to 15, a base plate 356 is provided at the top of each second tower base 35. A slide plate 357 is provided on the base plate 356 to hold the base plate 356 on the side, and a second fixed pulley 351 is provided on the slide plate 357. A hydraulic cylinder 358 is connected to the base plate 356 on one side. The hydraulic cylinder 358 can push the slide plate 357 to slide linearly on the base plate 356 in the axial direction of the second fixed pulley 351. The slide plate 357 has a first perforation 359 for winding the first The second sling 37 of the second fixed pulley 351 passes through when hanging down, and the base plate 356 has a second perforation 350 which can communicate with the first perforation 359 when the sliding plate 357 slides in a straight line.

As shown in FIG. 4, the suspension member 4 includes a coupling member 41 and a pair of hooks 42. The coupling member 41 has a perforation 411 for the pillar 13 of the wind turbine 1 to pass through. The retaining ring 131 is supported on the coupling member 41, and the coupling member 41 has a plurality of first hook portions 412 on opposite sides; each hook 42 can be hooked on two second hangers 38, and each hook 42 The plurality of second hook portions 421 on the side can be hooked to each other with the plurality of first hook portions 412 on either side of the coupling member 41, and the second and second spreaders 38 can be used to lift the wind turbine 1.

The first lifting gear 25 has a movable pulley 251, and a hook portion 252 is provided below the movable pulley 251. After the first sling 24 is suspended by the first fixed pulley 221, it passes around the movable pulley 251 and then back to the first fixed pulley 221 several times. In order to locate the end where the first sling 25 hangs from the first sling 24; the coupling member 41 is provided with a sling 413, and the first sling 25 (the hook portion 252 shown in the figure) can be combined with the sling 413 by the sling 253, To hoist the entire wind turbine 1. The second lifting gear 38 has a movable pulley 381, and a hook portion 382 is provided below the movable pulley 381. After the second sling 37 is suspended by the second fixed pulley 351, it passes around the movable pulley 381 and then back to the second fixed pulley 351. Secondly, to position the end of the second sling 38 on the second sling 37.

The first tower base 21 of this embodiment is provided with a water tank 27 for a weight of the first tower 25 when the wind generator 1 is hoisted. The second tower 35 of the second embodiment of the present embodiment is provided with water tanks 30 for lifting weights of the wind turbine 1 with the second spreaders 38 thereof.

In the above offshore wind turbine installation system, the method for installing a wind turbine at sea includes assembly on shore, loading before going to sea, and fixed-point installation at sea, of which:

The assembly operation on the shore is to lift the body 11, the blade 12, and the pillar 13 by the first hoisting rope 24 rolled by the first hoist 23 and the first hoisting 25 provided, and cooperate with the boom 22 on the first tower 21 is driven to swing horizontally to complete the aforementioned wind turbine on shore.

The loading operation before going to sea is performed after the wind turbine 1 is assembled on the shore, and the assembled wind turbine 1 is moved to a standby position on the shore by the swing of the boom 22, and as As shown in Figures 12 to 13, the platform 31 moves to the aforementioned shore from the sea, and the second sling 37 rolled by the second hoisting machine 36 is hoisted by the second spreader 38 provided in the prepared position. The motor 1 is moved by the second and second towers 35 along with the sliding table 33 to move the hoisted wind turbine 1 to the placement area 34. This placement area 34 can be provided with three wind forces in this embodiment. Generator 1 (posting 13 as the placement position in the figure). After each wind turbine 1 is loaded and positioned in the placement area 34 of the platform 3, it is set in the placement area 34 with a horizontal support 355 to fix the wind generator 1 to prevent the wind generator 1 from sailing with the platform 3. If shaking occurs, you can sail to the fixed point of installation. In this embodiment, in order to prevent the hoisted wind turbine from shaking excessively when in the preparation position, the shore lifting unit 2 is provided with a retaining wall 5 on the ground around the first tower base 21, and is provided here in the preparation The ground of the location, the wind turbine 1 lifted by the first spreader 25, can be confined in the retaining wall 5 by the bottom end of its pillar 13.

The fixed-point installation at sea is to wind the wind turbine 1 in the installation area 34 by the second tower 35 and the second spreader 38 as described above when sailing to the fixed point of the installation. The second tower 35 moves the lifted wind turbine 1 out of the placement area 34 as the slide table 33 linearly slides, and installs the wind turbine 1 at the aforementioned fixed point to complete the installation of the wind turbine 1 at sea.

From the above description, it is not difficult to find the advantages of the present invention, in that the onshore lifting unit 2 and the offshore lifting unit 3 both suspend the wind turbine 1 in pairs by slings, compared with the conventional floating crane. In terms of the whole type of wind turbine hanging, it can provide sufficient hanging capacity of wind turbine 1 with a relatively simplified lifting structure to complete the assembly of wind turbine 1 on shore and loading before going to sea. And offshore fixed-point installation, it can reduce the cost required for offshore installation of the wind turbine 1, and can provide installation efficiency and convenience.

The disclosure of the embodiments described above is used to illustrate the present invention, and is not intended to limit the present invention. Therefore, any change in numerical values or replacement of equivalent components should still belong to the scope of the present invention.

From the above detailed description, those skilled in the art can understand that the present invention can indeed achieve the aforementioned purpose, and indeed has met the provisions of the Patent Law, and filed a patent application.

(Conventional part)

91‧‧‧ body

92‧‧‧ post

93‧‧‧ Blade

(Part of the invention)

1‧‧‧wind turbine

11‧‧‧ body

12‧‧‧ Blade

13‧‧‧ post

131‧‧‧Retaining ring

2‧‧‧shore lifting unit

21‧‧‧The first tower

211‧‧‧Ring cushion

212‧‧‧clip

22‧‧‧ boom

221‧‧‧The first fixed pulley

222‧‧‧Shaft

223‧‧‧Guide

23‧‧‧The first hoist

24‧‧‧First Sling

25‧‧‧First spreader

251‧‧‧movable pulley

252‧‧‧ Hook

253‧‧‧Sling

26‧‧‧Hydraulic cylinder

261‧‧‧Fixture

262‧‧‧cylinder

27‧‧‧Water tank

3‧‧‧ Offshore Lifting Unit

31‧‧‧platform

311‧‧‧rail

312‧‧‧clip

32‧‧‧ Pillar

33‧‧‧Slide

34‧‧‧Placement Area

35‧‧‧Second Tower

351‧‧‧Second fixed pulley

352‧‧‧ cushion

353‧‧‧ Counterweight

354‧‧‧Lasso

355‧‧‧horizontal support

356‧‧‧ substrate

357‧‧‧skateboard

358‧‧‧hydraulic cylinder

359‧‧‧first perforation

350‧‧‧second perforation

36‧‧‧Second Hoist

37‧‧‧Second Sling

38‧‧‧Second spreader

381‧‧‧movable pulley

382‧‧‧ Hook

39‧‧‧hydraulic cylinder

391‧‧‧Fixture

392‧‧‧cylinder

30‧‧‧Water tank

4‧‧‧ Hanging

41‧‧‧Combination

411‧‧‧perforation

412‧‧‧First hook

413‧‧‧Eyebolt

42‧‧‧Hook

421‧‧‧Second hook

5‧‧‧ retaining wall

FIG. 1 is a front view of a configuration of an offshore wind turbine installation system according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a structure in which a boom is arranged on a first tower base and can be driven to swing horizontally according to an embodiment of the present invention. FIG. 3 is a schematic diagram of a wind turbine being hoisted by an offshore lifting unit according to an embodiment of the present invention. FIG. 4 is a partial schematic view of the second spreader according to the embodiment of the present invention being hooked and combined with a hook and a coupling member. FIG. 5 is a partial schematic view of the boom connected to the first tower by a rotating shaft according to the embodiment of the present invention. Figure 6 is a schematic diagram of the boom in Figure 2 driven by a hydraulic cylinder on the first tower to swing horizontally. FIG. 7 is a schematic diagram of an offshore hoisting unit according to an embodiment of the present invention, which is arranged on a platform in a plan view of two slides. The figure also shows that three wind turbines (indicated by columns) are placed in the placement area. FIG. 8 is a schematic view of a sliding table provided on a guide rail and sliding linearly according to an embodiment of the present invention. FIG. 9 is a schematic diagram of a hydraulic cylinder driven by a slide table provided on a guide rail and a clamp seat according to an embodiment of the present invention. Fig. 10 is a schematic diagram when the hydraulic cylinder drives the slide table in Fig. 9 when the slide table is linearly displaced. FIG. 11 is a schematic diagram of the fixtures of the onshore lifting unit or the offshore lifting unit provided on the clamp base according to the embodiment of the present invention. Fig. 12 is a schematic diagram of the offshore lifting unit hoisting the wind power generator at a preliminary position where the second tower is suspended by a second sling on the shore according to the embodiment of the present invention. Figure 13 is a schematic diagram of the second tower slinging linearly on the slide platform after the wind turbine is hoisted in the second sling of Figure 12, and the wind turbine can be placed in the placement area after sliding Inside. FIG. 14 is a schematic diagram illustrating that the second fixed pulley at the top of the second tower base according to the embodiment of the present invention can be driven by a hydraulic cylinder to move sideways. FIG. 15 is a partial schematic diagram of the one side of FIG. 14 when the substrate and the slide plate are overlapped, and it can be seen that the side of the slide plate buckles the substrate without turning over. Figure 16 is a schematic diagram of a conventional wind turbine. Figure 17 is a schematic diagram of the conventional wind turbine after being disassembled and then placed on the installation ship.

Claims (12)

An installation system for an offshore wind generator. The aforementioned wind generator is provided with a body with a plurality of blades arranged at the top of a pillar, and the body can generate electricity when the plurality of blades are driven by wind to rotate. The installation system includes: a shore The hoisting unit has a first tower on the shore, a boom which can be driven to swing horizontally at the top of the first tower, and a first hoist fixed to the position of the first tower , The boom has two first fixed pulleys at the same end at the same horizontal height and separated by a distance, and a pair of first slings can be connected to the first hoist with one end to be rolled, and respectively pass around the second A certain pulley hangs down to the ground, and each of the first slings has a first sling at the aforementioned suspended end; a maritime lifting unit, a platform capable of navigating at sea, and the platform has a fixed extension to the sea floor A pair of sliding tables on the sea floor support, and a pair of sliding tables can slide on the platform in parallel and linearly, and there is a placement area between the pair of sliding tables. Off-platform The second tower, each of which has a second hoist at its location, and the two second towers on the same side can protrude from the platform and each has a second fixed pulley, the two second fixed pulleys The two sides of the placement area are at the same level. Each of the second towers has a second sling which is connected to the second hoist of the second tower at one end by a scroll, and passes around the second hoist. The second fixed pulleys of the two towers can hang down to the platform, and each of the second slings has a second sling at the aforementioned hanging end; a hanging piece can be fixed to the pillar of the wind turbine, for the two The second spreader can be combined to lift the wind turbine and slide along the sea with the two second towers. The offshore wind turbine installation system according to claim 1, wherein the boom is rotatably provided on the first tower base with a rotating shaft, and the first tower base has an annular cushion body under the boom, the A guide and sliding part is slidably carried on the cushion body at the bottom of the boom, and can support the boom to swing on the first tower base; the first tower base is also provided with a ring-shaped clamp base, a plurality of hydraulic pressure The cylinders are respectively movable at one end but can be temporarily fixedly connected to the clamp base, and the other end is connected to the boom, and a plurality of hydraulic cylinders can gradually push the boom to rotate on the first tower base. The offshore wind turbine installation system according to claim 1, wherein the platform has a pair of outward guide rails and a pair of opposite clamp bases corresponding to the sliding path of each slide table, and the pair of guide rails and the The clamp bases are linear and are arranged in parallel on the platform, and the bottom of each slide platform is slidably arranged on the pair of guide rails; each pair of clamp bases has a plurality of hydraulic cylinders which are movable at one end but can be temporarily fixedly connected; The other end of each of the hydraulic cylinders is connected to the slide table, and each of the slide tables can be gradually pushed by the connected plurality of hydraulic cylinders to slide linearly on the platform. The offshore wind turbine installation system according to claim 2 or 3, wherein the cross-section of the clamp seat is in an I-shape, and each of the hydraulic cylinders is movably arranged at a end connected to the clamp seat. At the top of the clamp base, there are a plurality of clamp cylinders in the clamp, and the clamp can be temporarily fixed by supporting the clamp cylinders in the clamp base, or can be moved on the clamp base by loosening the clamp base. The offshore wind turbine installation system according to claim 1, wherein the two second towers are provided with a cushion across the two second towers on a side provided with the second fixed pulley, and A cable with a weight block is connected at both ends to the second tower and the hanger; when the two second towers use the two second spreaders to lift the wind turbine and slide, the cushion is used to provide The column of the wind turbine during sliding is leaning against it, and the suspension cable is used to pull the hanger toward the cushion when the weight block set is sinking, so that the wind turbine during sliding will not shake. The offshore wind turbine installation system according to claim 1, wherein a top plate of each of the second towers has a base plate, a slide plate is provided on the base plate to buckle the base plate, and the second fixed pulley is provided on the base plate. On the slide plate, one side of the slide plate is connected with a hydraulic cylinder on the base plate, and the hydraulic cylinder can push the slide plate to slide linearly on the base plate in the axial direction of the second fixed pulley. Said first perforation which the second sling of the second fixed pulley passes through when hanging down, and the base plate has a second perforation which can communicate with the first perforation when the slide slides linearly. The offshore wind turbine installation system according to claim 1, wherein the hanger includes a coupling member and a pair of hooks, the coupling member has a perforation for the pillar of the wind turbine, and the pillar is in a There is a retaining ring on the outer periphery of the joint, which can have a plurality of first hooks on opposite sides; each of the hooks can be hooked on the second and second hangers, and each of the hangers The hook has a plurality of second hook portions on one side, and the plurality of first hook portions on either side of the coupling member can hook each other. The offshore wind turbine installation system according to claim 7, wherein the first crane has a movable pulley, and a hook is provided below the movable pulley, and the first sling is suspended by the first stationary pulley and wound around After the moving pulley, the first fixed pulley is wound back several times to locate the end of the first sling hanging from the first sling; the coupling is provided with a sling, and the first sling is connected to the sling by a sling. To lift the wind turbine. The offshore wind turbine installation system according to claim 1, wherein the second crane has a movable pulley, and a hook is provided below the movable pulley, and the second sling is suspended by the second stationary pulley and wound around After passing through the movable pulley, the second fixed pulley is wound back several times to locate the end of the second sling on the second hanging rope. The offshore wind turbine installation system according to claim 1, wherein the shore lifting unit is provided with a retaining wall on the ground around the first tower base, and the wind turbine lifted by the first spreader can use its uprights The bottom end is confined to the retaining wall. The offshore wind turbine installation system according to claim 1, wherein the first tower is provided with a water tank for its first spreader to lift the wind generator; the two second towers are provided with A water tank for the second lifting device to lift the wind turbine. A method for installing a wind turbine at sea according to the installation system according to any one of claims 1 to 11, comprising: shore assembly: a first sling rolled by the first hoist and a first hoist provided Lifting the aforesaid body, blades and uprights, and cooperating with the boom being driven on the first tower to swing horizontally, to complete the wind turbine on the shore in assembly; loading before going to the sea: using the rotation of the boom The assembled wind turbine will be moved to a standby position on the shore, and the platform will be moved to the aforementioned shore at sea from the platform, and the second sling rolled by the second hoist will be used to set the second hoist. The wind turbine with a hoisting position in the standby position is moved to the placement area by the two and second towers following a linear sliding movement of the sliding platform, and is set on a horizontal support member. The placement area is used to fix the wind turbine; and fixed-point installation at sea: when the platform sails at sea to the fixed point of the installation, the two second towers are then hoisted at the location by the second spreader as described above. Release of wind turbines, and by the two second The seat and lifted out of the placement of the wind turbine area and wind turbines installed in the point to complete the installation of offshore wind turbines with linearly sliding the slide table.