CN114873485A - A self-hoisting device and hoisting method on the top of a wind turbine tower - Google Patents

Abstract

The invention discloses a tower top self-hoisting device and a hoisting method for a wind power generating set. The tower top self-hoisting device includes a bracket, a jib, a translation trolley, a slewing bearing, a tower cap, a balance arm, a trolley hook, a hoisting hook, a hoist, a hoist, a first set of ropes, a second set of ropes and pulleys. The parts of the self-hoisting device can be transported to the inside of the nacelle by the hoist or truck crane in the nacelle. The bottom end of the bracket is connected with the base of the wind turbine, the top end is connected with the fixed ring of the slewing bearing, and the rotating ring of the slewing bearing is connected with the boom, the tower cap and the balance arm; the boom is provided with a track, and the translation trolley can lift along the track. The arm moves horizontally. The self-hoisting device can be assembled and disassembled manually or in the form of tooling to lift and lower heavy components such as generators, gearboxes, converters and transformers in the engine room instead of conventional large-scale lifting devices. Reduce operation and maintenance costs.

Description

A self-hoisting device and hoisting method on the top of a wind turbine tower

technical field

The invention belongs to the technical field of wind power generation, and in particular relates to a tower top self-hoisting device and a hoisting method for a wind power generating set.

Background technique

The nacelle of the wind turbine generally includes the main train, gearbox, generator and peripheral auxiliary equipment (such as lubrication, cooling system, etc.). Due to the high-speed continuous operation of gearboxes and generators, the probability of needing maintenance and replacement is much higher than that of other components. The capacity of modern wind turbines is getting larger and larger, and the size and weight of gearboxes and generators are constantly increasing. The maximum weight of gearboxes and generators for doubly-fed and medium-speed units has exceeded 40 tons. At the same time, in order to obtain higher wind speeds, it has become a conventional configuration for the hub center height to exceed 100 meters. In the event that a gearbox or generator needs to be repaired or replaced, the traditional approach is to use a crane to lift the components in the nacelle to the ground. If large wind turbines continue to use such methods, the economics will be poor.

CN 202545121 U, CN 211310597 U, and CN 201395498 Y all propose technical solutions of self-contained cranes, and components on the tower are transported to the bottom of the tower through a hoist at the bottom of the tower.

Inventions such as CN 211310597 U, CN 211343235 U, CN 101224855 B, CN 201729604 U, CN206188299 U and the like all adopt a gantry type technical solution, but are only suitable for the movement of heavy objects inside the cabin.

CN 108105041 A proposes a scheme for maintenance and hoisting of gearboxes, but parts need to be transported from engine room to tower bottom in batches.

The above existing technical solutions basically use the original nacelle frame as the basis for the support of the hoisting equipment. With the increase of the capacity of the unit and the increase of the weight of the parts, it is impossible to increase the strength of the nacelle frame specially for maintenance and replacement. This solution is very economical. If the components are disassembled at the top of the tower, time-consuming will become a problem, and the unit will not be able to operate normally, which will have a negative impact on the economic benefits of the wind farm.

SUMMARY OF THE INVENTION

In view of this, the purpose of the embodiments of the present invention is to provide a tower top self-hoisting device and a hoisting method for a wind turbine, so as to solve at least one technical problem in the background art.

In order to achieve the above purpose, the first aspect provides a self-hoisting device on the top of a wind turbine tower, which includes: a bracket, a jib, a translation trolley, a slewing bearing, a tower cap, a balance arm, a trolley hook, a hoisting hook, Windlasses, hoists, ropes and pulleys.

The bottom end of the bracket is connected with the base of the wind turbine, the top end is connected with the fixed ring of the slewing bearing, the rotating ring of the slewing bearing is connected with the tower cap, and the balance arm and the boom are respectively connected with the tower cap join. A pull rod or a pull cable is connected between the boom, the tower cap, and the balance arm and the tower cap.

The boom is provided with a track, and the translation trolley can move horizontally along the track. The rope goes around the pulley on the translation trolley to connect the hoist and the trolley hook in the engine room. Pulleys are installed on the tower cap and the balance arm, and the rope goes around these pulleys to connect the hoisting hook and the hoist at the bottom of the tower.

In a further technical solution, the hoist is used to move the bracket, the boom, the translation trolley, the slewing bearing, the tower cap, the balance arm, and the trolley hook And the lifting hook is transported to the interior of the nacelle.

In a further technical solution,

The translation trolley is used to move to the top of the hoisted part;

the trolley hook is used for hooking the hoisted part when the translation trolley moves above the hoisted part;

The hoist is also used to hoist the hoisted component to a predetermined height when the trolley hook hooks the hoisted component, so that the bottom of the hoisted component is at least a preset distance higher than the top of the nacelle cover ;

The translation trolley is also used for translation on the track of the boom, so as to send the hoisted component to the outside of the nacelle;

The hoisting hook is used to hook the hoisted part;

The hoist is used to hoist the hoisted component for a preset distance through the hoisting hook, and after the trolley hook and the first set of ropes connected are not loaded, the trolley is hoisted. The hook is unhooked, and the hoisted part is put down to the bottom of the tower after the unhooking;

Wherein, the hoisted components include: gearbox, generator, converter or transformer;

Wherein, the fixed point of the hoist includes: a main shaft, a base, a tower tube or a tower cap;

Wherein, a preset margin is reserved for the length of the second set of ropes, which is used to ensure that the hoisted component is not carried when hoisted by the first set of ropes.

In a further technical solution, the hoist is fixedly connected to the foundation of the wind turbine through a coupling.

In a further technical solution, a nacelle cover is detachably provided on the top of the nacelle; or, a nacelle cover that can move along the top of the nacelle is provided on the top of the nacelle.

In a further technical solution, the described self-hoisting device on the top of the wind turbine tower also includes:

A turning tool for turning the turning circle of the yaw bearing of the wind turbine through 60 degrees to 120 degrees; and,

Mounting tooling for hoists in the nacelle on brackets, jibs, translation trolleys, slewing rings, tower caps, balance arms, trolley hooks, hoist hooks, first set of ropes, second set of ropes and pulleys Or after the truck crane is transported to the inside of the engine room, the bracket, the boom, the translation trolley, the slewing bearing, the tower cap, the balance arm, the trolley hook, the lifting hook, the first set of ropes, the second set of ropes, pulleys, The winch and the hoist are assembled according to the connection relationship between the various components to obtain the self-hoisting device on the top of the wind turbine tower.

In a further technical solution, the base is arranged in the nacelle of the wind turbine; the hoist is arranged at the bottom of the tower of the wind turbine.

In a further technical solution, a pulley is installed on the top of the tower cap; a pulley is installed on the upper surface of the balance arm; and a pulley is installed on the top of the translation trolley.

In a second aspect, a self-hoisting system on the top of a wind turbine tower is provided, which includes:

According to any one of the above-mentioned wind turbine tower self-hoisting device;

a hoist provided in the nacelle of the wind turbine; and,

A hoist installed at the bottom of the tower of the wind turbine.

In a third aspect, a hoisting method for a self-hoisting system on the top of a wind turbine tower is provided, which includes the following steps:

S1. Pass the bracket, jib, translation trolley, slewing bearing, tower cap, balance arm, trolley hook, hoist hook, the first set of ropes, the second set of ropes and pulleys through the hoist and tower in the engine room Internal transport devices or truck cranes are transported to the interior of the engine room;

S2. Use the installation tooling to assemble the bracket, the boom, the translation trolley, the slewing bearing, the tower cap, the balance arm, the trolley hook, the lifting hook, the first set of ropes, the second set of ropes and the pulley. After the assembly is completed Obtain the self-hoisting device on the top of the wind turbine tower;

S3. Move the translation trolley to the top of the hoisted part;

S4. Use a trolley hook to hook the hoisted parts, one end of the first set of ropes is connected to the trolley hook, and the other end of the first set of ropes is connected to the hoist inside the engine room;

S5. Use the lifting hook to hook the hoisted parts, and use the second set of ropes to connect the lifting hook to the hoist at the bottom of the tower;

S6. Fix the translation trolley on the boom with a fixing piece;

S7. Use a hoist to lift the hoisted part to a predetermined height, the bottom of the hoisted part is at least a preset distance higher than the top of the nacelle cover, and the power provided by the hoist must overcome at least half of the gravity of the hoisted part;

S8. Use the rotating tool to make the rotating ring of the yaw support rotate by a preset angle, at this time, the hoisted parts are completely located outside the nacelle;

S9. Start the hoist, hoist the hoisted part for a preset distance, and unhook the trolley hook after the trolley hook and the first set of ropes connected are not loaded;

S10. Use the winch to lower the hoisted parts to the bottom of the tower.

Optionally, the hoisted component includes: a gearbox, a generator, a converter or a transformer; the fixing point of the hoist includes: a main shaft, a base, a tower, or a tower cap; the second set of ropes A preset margin is reserved for the length to ensure that the hoisted component does not carry the load when it is hoisted by the first set of ropes; the preset angle through which the rotating circle rotates is 60 degrees to 120 degrees.

The beneficial effects of the above technical solutions include:

In the embodiment of the present invention, the hoisting of parts such as gearboxes or generators, and the transportation between the tower bottom and the tower top can be accomplished by means of a trolley hook, a hoisting hook, a hoist, a rope and a pulley. The top part of the self-hoisting device is easy to assemble and disassemble. Wind turbines do not need to use conventional large cranes when replacing large components such as generators, gearboxes, converters or transformers, which greatly reduces operation and maintenance costs.

Description of drawings

1 is a schematic diagram of a self-hoisting device on the top of a wind turbine tower according to an embodiment of the present invention;

2 is a side view of a wind turbine generator set and its tower top self-hoisting device according to an embodiment of the present invention;

3 is a top view of a self-hanging device on the top of a wind turbine tower according to an embodiment of the present invention;

FIG. 4 is a flowchart of a hoisting method for a self-hoisting system on the top of a wind turbine tower according to an embodiment of the present invention.

Description of reference numerals: 1-tower, 2-nacelle, 3-base, 4-nacelle cover, 5-support, 6-jib, 7-translation trolley, 8-slewing bearing, 9-tower cap, 10 -Balance arm, 11- trolley hook, 12- lifting hook, 13- hoist, 14- first set of ropes, 15- pulley, 16- gear box, 17- generator, 18- wind turbine foundation, 19- Second set of ropes.

It should be noted that the above drawings are used to illustrate the features of the present invention, and are not intended to show any actual structure or to reflect the details of the dimensions, relative proportions, etc. of various components. In order to more clearly illustrate the principles of the invention, and to avoid obscuring the principles of the invention with unnecessary detail, the examples in the figures have been simplified. These figures will not bring inconvenience to those skilled in the related art when understanding the present invention, and the actual self-hoisting device on the top of the wind turbine tower may include more components.

Detailed ways

In order to make the purposes and technical solutions of the embodiments of the present invention clearer, the embodiments of the present invention are fully described below with reference to the related drawings of the embodiments of the present invention. This patent describes only some, but not all, embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figures 1 to 3, a tower top self-hoisting device for a horizontal axis wind turbine includes: a bracket 5, a boom 6, a translation trolley 7, a slewing bearing 8, a tower cap 9, a balance arm 10, a trolley The hook 11 , the lifting hook 12 , the hoist 13 , the hoist, the first set of ropes 14 , the second set of ropes 19 and the pulley 15 .

The bracket 5, the jib 6, the translation trolley 7, the slewing bearing 8, the tower cap 9, the balance arm 10, the trolley hook 11 and the hoist hook 12 are all detachable, and these components can be passed through the hoist in the engine room 2 Or the lifting equipment inside the tower (such as a climber or an elevator) or a car is hoisted and transported to the inside of the engine room for assembly. Because the individual components are lightweight, they can be assembled manually or with simple tooling. The hoist 13 can be transported to the side of the wind turbine by a truck crane, and then fixed on the foundation 18 of the wind turbine through a coupling.

The nacelle cover 4 above the base 3, the gearbox 16, the generator 17 and the converter can be dismantled or moved to facilitate the installation of the self-hoisting device. Lifting of components. The bottom end of the bracket 5 is connected with the base 3 of the wind turbine, the top end is connected with the fixed ring of the slewing bearing 8, the rotating ring of the slewing bearing 8 is connected with the tower cap 9, and the balance arm 10 and the boom 6 are connected with the tower cap 9. Between the boom 6 and the tower cap 9, and the balance arm 10 and the tower cap 9, there are tie rods or cable connections.

The boom 6 is provided with a track, and the translation trolley 7 can move horizontally along the track. The first set of ropes 14 goes around the pulley 15 on the translation trolley 7 to connect the hoist and the trolley hook 11 in the nacelle 2 . Pulleys 15 are installed on the tower cap 9 , the translation trolley 7 and the balance arm 10 , and the second set of ropes 19 bypasses these pulleys 15 to connect the hoisting hook 12 and the hoist 13 at the bottom of the tower.

In some embodiments, the hoist 13 can be used to transport the bracket 5, the boom 6, the translation trolley 7, the slewing bearing 8, the tower cap 9, the balance arm 10, the trolley hook 11 and the hoist hook 12 to the The interior of cabin 2.

In some embodiments, the translation trolley 7 is used to move to the top of the hoisted part; the trolley hook 11 is used to hook the hoisted part when the translation trolley 7 moves to the top of the hoisted part; the hoist, also When the trolley hook 11 hooks the hoisted part, the hoisted part is hoisted to a predetermined height, so that the bottom of the hoisted part is at least a preset distance higher than the top of the hood; The arm 6 is translated on the track to send the hoisted part to the outside of the nacelle 2; the hoisting hook 12 is used to hook the hoisted part; the hoist 13 is used to re-hoist the hoisted part through the hoisting hook 12 From a preset distance, after the trolley hook 11 and the connected first set of ropes 14 are not loaded, the trolley hook 11 is decoupled, and the hoisted part is lowered to the bottom of the tower after the decoupling; wherein, the hoisted part may include : gearbox, generator, converter or transformer, etc.; wherein, the fixed point of the hoist can include: main shaft, base, tower or tower cap, etc.; wherein, the length of the second set of ropes 19 has a preset margin , which is used to ensure that the hoisted component is not carried when hoisted by the first set of ropes 14 .

In some embodiments, a self-hoisting device on the top of a wind turbine tower further includes: a rotating tool for making the rotating circle of the yaw support of the wind turbine rotate through 60 degrees to 120 degrees; and, an installation tool for In the bracket 5, the boom 6, the translation trolley 7, the slewing bearing 8, the tower cap 9, the balance arm 10, the trolley hook 11, the lifting hook 12, the first set of ropes 14, the second set of ropes 19 and pulleys 15 After the hoist or truck crane in the engine room 2 is hoisted and transported to the inside of the engine room 2, the bracket 5, the boom 6, the translation trolley 7, the slewing bearing 8, the tower cap 9, the balance arm 10, the trolley hook 11, the hoist The hook 12 , the first set of ropes 14 , the second set of ropes 19 , the pulley 15 , the hoist 13 and the hoist are assembled according to the connection relationship between the components to obtain the self-hoisting device on the top of the wind turbine tower.

Referring to Figure 4, the working principle and working process of the wind turbine tower top self-hoisting device include the following steps:

S1. Connect the bracket 5, the jib 6, the translation trolley 7, the slewing bearing 8, the tower cap 9, the balance arm 10, the trolley hook 11, the hoist hook 12, the first set of ropes 14, the second set of ropes 19 and The pulleys 15 and other components are transported to the interior of the engine room 2 by means of a hoist or a transport device inside the tower 1 or a car hoist.

S2. The self-hoisting device is assembled by using an installation tool such as but not limited to a car crane according to the aforementioned connection relationship. After the assembly work is completed, the tower top self-hoisting device of the embodiment of the present invention is obtained.

S3. Move the translation trolley 7 along the boom 6 to above the components to be hoisted. The hoisted components are mainly the gearbox 16, the generator 17, the converter or the transformer.

S4. Use the trolley hook 11 to hook the hoisted parts. One end of the first set of ropes 14 is connected to the trolley hook 11, and the other end is connected to the hoist inside the engine room 2. The fixed point of the hoist can be the main shaft, the base 3, the tower 1. Or other fixed components of the tower cap 9.

S5. Use the hoisting hook 12 to hook the hoisted parts and use the second set of ropes 19 to connect the hoisting hook 12 to the hoist 13 at the bottom of the tower. The length of the second set of ropes 19 has a certain margin to ensure that in the next The second set of ropes 19 is not loaded when the hoisted part is raised. Specifically, the trolley hook 11 lifts the hoisted part and then uses the translation of the translation trolley 7 to send the hoisted part to the outside of the nacelle; the hoisting hook 12 is connected to the hoist 13, and the trolley hook 11 needs to be transported to the bottom of the tower. Unhook first, and completely hook the hoisted parts by the hoisting hook 12 .

S6. The translation trolley 7 is fixed on the boom 6 by fixing parts such as but not limited to locking pins and cannot move arbitrarily. At this time, the role of the translation trolley is a fixed fulcrum of the second set of ropes 19. It remains fixed during transportation to the bottom of the tower.

S7. Use the hoist to hoist the hoisted parts to a certain height. The bottom of the hoisted parts should be at least a certain distance higher than the top of the nacelle cover. Due to the use of the pulley block (including movable pulleys and fixed pulleys), the power that the hoist needs to provide at least Overcome the gravity of half of the parts being lifted.

S8. Use tooling such as cranking to make the rotating circle of the yaw slewing bearing rotate through 60 to 120 degrees, preferably 90 degrees. At this time, the hoisted parts should be completely located outside the nacelle. During the above process, the second set of ropes 19 connecting the hoisting hook 12 and the hoisting machine 13 at the bottom of the tower is not tightened, so the second set of ropes 19 will not damage the cabin cover or other components.

S9. Start the hoist 13 to hoist the hoisted parts for a further distance. At this time, the second set of ropes 19 gradually changes from a nearly natural state to a tensioned state, and the main bearing parts are also gradually lifted by the trolley hook 11 and the connected One set of ropes 14 becomes the hoisting hook 12 and a second set of ropes 19 attached. After the trolley hook 11 and the connected first set of ropes 14 are hardly loaded, the trolley hook 11 is unhooked.

S10. Next, use the hoist 13 to lower the hoisted component.

Finally, hoist the replaced new parts into the nacelle according to the method similar to the above.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated in terms such as "upper, lower, inner and outer" is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and to simplify the description rather than to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first, second or third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

Unless otherwise expressly specified and limited in the present invention, the term "installation, connection, connection" should be understood in a broad sense, for example: it may be a fixed connection, a detachable connection or an integral connection; it may also be a mechanical connection, an electrical connection or a direct connection. The connection can also be indirectly connected through an intermediate medium, or it can be the internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

While the present invention has been described with reference to the preferred embodiments, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (10)

1. The utility model provides a wind generating set top of tower is from hoisting apparatus which characterized by: the top of the tower is from hoisting device includes: the device comprises a support, a crane boom, a translation trolley, a slewing bearing, a tower cap, a balance arm, a trolley lifting hook, a winch, a hoister, a first set of ropes, a second set of ropes and a pulley;

the bottom end of the support is connected with a base of the wind generating set, the top end of the support is connected with a fixed ring of the slewing bearing, a rotating ring of the slewing bearing is connected with the tower cap, and the balance arm and the crane arm are respectively connected with the tower cap;

the crane boom is provided with a track, and the translation trolley can horizontally move on the crane boom along the track;

the first set of ropes is wound around the pulley on the translation trolley to be connected with a hoist in the cabin and the trolley hook;

pulleys are arranged on the tower cap and the balance arm, and the second set of ropes bypasses the pulleys to be connected with the hoisting hook and the winch at the bottom of the tower.

2. The tower top self-lifting device of the wind generating set according to claim 1, wherein: the crane boom is connected with the tower cap, and a pull rod or a pull rope is arranged between the balance boom and the tower cap for connection.

3. The tower top self-lifting device of the wind generating set according to claim 1, wherein: the lifting machine is used for conveying the support, the crane boom, the translation trolley, the slewing bearing, the tower cap, the balance arm, the trolley lifting hook and the lifting hook to the interior of the cabin.

4. The tower top self-lifting device of the wind generating set according to any one of claims 1 to 3, characterized in that:

the translation trolley is used for moving to the position above the hoisted part;

the trolley lifting hook is used for hooking the hoisted part when the translation trolley moves to the upper part of the hoisted part;

the hoisting machine is also used for hoisting the hoisted part to a preset height when the trolley lifting hook hooks the hoisted part, so that the bottom of the hoisted part is at least higher than the top end of the cabin cover by a preset distance;

the translation trolley is also used for translating on the track of the crane arm so as to send the hoisted part to the outside of a cabin;

the hoisting hook is used for hooking the hoisted part;

the hoisting machine is used for hoisting the hoisted part for a preset distance through the hoisting hook, unhooking the trolley lifting hook after the trolley lifting hook and the connected first set of ropes are not loaded, and putting down the hoisted part to the tower bottom after unhooking;

wherein the hoisted component comprises: a gearbox, generator, converter or transformer;

wherein, the fixed point of lifting machine includes: a main shaft, a base, a tower or a tower cap;

and a preset allowance is reserved for the length of the second set of ropes so as to ensure that the hoisted part is not loaded when being hoisted by the first set of ropes.

5. The tower top self-lifting device of the wind generating set according to claim 1, wherein: the winch is fixedly connected to the base of the wind generating set through a connecting piece; the base is arranged in the cabin of the wind generating set.

6. The tower top self-lifting device of the wind generating set according to claim 1, wherein:

the top of the engine room is detachably provided with an engine room cover body; alternatively, the nacelle roof is provided with a nacelle cover that can be moved along the nacelle roof.

7. The tower top self-lifting device of the wind generating set according to claim 1, further comprising:

the rotating tool is used for enabling a rotating ring of a yaw support of the wind generating set to rotate by 60-120 degrees; and the number of the first and second groups,

and the mounting tool is used for assembling the support, the cargo boom, the translation trolley, the slewing bearing, the tower cap, the balance arm, the trolley lifting hook, the first set of rope, the second set of rope and the pulley according to the connection relation among all the parts after the support, the cargo boom, the translation trolley, the slewing bearing, the tower cap, the balance arm, the trolley lifting hook, the first set of rope, the second set of rope, the pulley, the winch and the lifting machine are conveyed into the cabin through the lifting machine or the automobile crane in the cabin, so that the tower top self-lifting device of the wind generating set is obtained.

8. The tower top self-lifting device of the wind generating set according to claim 1, wherein:

the top of the tower cap is provided with a pulley;

the upper surface of the balance arm is provided with a pulley;

and the top of the translation trolley is provided with a pulley.

9. A hoisting method of a wind generating set tower top self-hoisting device, which is characterized in that the method is based on the wind generating set tower top self-hoisting device of any one of claims 1 to 8, and the hoisting method comprises the following steps:

s1, conveying the support, the crane boom, the translation trolley, the slewing bearing, the tower cap, the balance arm, the trolley hook, the crane hook, the first set of ropes, the second set of ropes and the pulley to the interior of the cabin through a hoist or an automobile crane in the cabin;

s2, assembling the support, the crane boom, the translation trolley, the slewing bearing, the tower cap, the balance arm, the trolley hook, the crane hook, the first set of rope, the second set of rope and the pulley by using an installation tool to obtain a tower top self-lifting device of the wind generating set;

s3, moving the translation trolley to the position above the hoisted part;

s4, hooking the hoisted part by using a trolley lifting hook, wherein one end of a first set of ropes is connected with the trolley lifting hook, and the other end of the first set of ropes is connected with a hoist in the cabin;

s5, hooking the hoisted part by using a hoisting hook, and connecting the hoisting hook with a winch at the bottom of the tower by using a second set of ropes;

s6, fixing the translation trolley on the crane arm by using a fixing piece;

s7, hoisting the hoisted component to a preset height by using a hoist, wherein the bottom of the hoisted component is at least higher than the top end of the cabin cover by a preset distance, and the power provided by the hoist at least overcomes half of the gravity of the hoisted component;

s8, rotating a rotating ring of the yaw support by a preset angle by using a rotating tool, so that the hoisted part is completely positioned outside the engine room;

s9, starting the winch, hoisting the hoisted part for a preset distance, and unhooking the trolley lifting hook after the trolley lifting hook and the connected first set of ropes are not loaded;

and S10, lowering the hoisted part to the bottom of the tower by using a winch.

10. The hoisting method of the tower top self-hoisting system of the wind generating set according to claim 9, characterized in that:

the hoisted member includes: a gearbox, generator, converter or transformer;

the fixed point of lifting machine includes: a main shaft, a base, a tower or a tower cap;

the length of the second set of ropes is reserved with a preset allowance for ensuring that the hoisted part is not loaded when being hoisted by the first set of ropes;

the preset angle of the rotating ring is 60-120 degrees.

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