DE112018003143T5 - Lifting system for a moment bearing, method for assembling and disassembling a moment bearing and use of such a lifting system - Google Patents

Abstract

A lifting system for a torque bearing (9) of a wind turbine (1) is described, which comprises a bearing lifting tool (15). The bearing lifting tool (15) comprises: a flange (16) with a main body (32), which has a first flat surface (18) provided with holes (20) arranged along a circle (19), and one Lifting bracket (17) which has a first end (17), which is fastened via a fastening region (24) to a second surface (23) of the main body (32) of the flange (16), and a second end (22), which to a position outside the circle (19) along which the holes (20) are arranged. The second end (22) of the lifting bracket (17) is provided with at least one main lifting eye (25) which is set up to be hooked onto a crane. The main lifting eye (25) is located outside a gravitational plane (26) containing the first flat surface (18), and in use this gravitational plane (26) will be the plane in which the lifting bracket (17) is in contact with the Bearing (9), preferably an inner ring (10) of the bearing (9). This system enables the assembly and disassembly of a torque bearing (9) of a wind turbine (1) with a rotor shaft, which has an inclination angle (33) different from 0 °, in a simple and safe manner.

Description

Field of the Invention

The present invention relates generally to the field of wind turbines and, more particularly, to a momentum bearing system for a wind turbine having a nacelle having a main structure, a rotor, the rotor having at least two rotor blades, each of which is mounted on a rotor hub via a foot end of the rotor blade , wherein the rotor hub is connected to a torque bearing, the system comprising a bearing lifting tool.

The invention further relates to a method for assembling and disassembling a torque bearing of a wind turbine bearing with a nacelle, which has a main structure, and a rotor, the rotor comprising at least two rotor blades, each of which is mounted on a rotor hub via a foot end of the rotor blade, the The rotor hub is connected to a main shaft via a torque bearing, and the wind turbine has a rotor shaft, which preferably has an angle of inclination different from 0 °. In addition, the invention relates to the use of such a system and such a method for assembling and disassembling a torque bearing.

Background of the Invention

There are several and stricter requirements to keep a moment bearing as circular as possible. Even very small deviations from a flat circular bearing can destroy the moment bearing.

As a rule, a moment bearing is assembled and disassembled with a lifting eye arranged in the outer surface of the outer ring of the moment bearing. When lifting the weight in the lifting eyelid, however, there is a risk that the circularity of the bearing changes and the bearing is destroyed.

There have been requirements for a more efficient and simple way of assembling and disassembling a moment bearing. These requirements are also problematic since the nacelle would normally be arranged with a rotor with a main shaft or axis of rotation arranged at an angle of inclination. Normally the angle of inclination would be positive. The angle of inclination is defined as the angle between a horizontal axis and an axis of rotation for the rotor. A positive angle would increase the height of the hub and also the clearance to the tower.

When mounting the torque bearing with conventional tools, there are difficulties in aligning the torque bearing hanging in the lifting eyelid to the angle of the tilted nacelle.

In addition, there is an increasing need to reduce the cost of manufacturing and maintaining wind turbines. Therefore, it is also desirable to provide a system that is simple to manufacture and that could also reduce the time required to assemble and disassemble the torque bearing while ensuring that there is no deviation in the circularity of the bearing.

The EP 2,226,496 A2 discloses a lifting system of the type mentioned in the introduction. There is a need to provide a useful alternative to this prior art and to provide a lifting system which is used for assembling and dismantling torque bearings of a wind turbine, preferably a wind turbine with a rotor shaft with an inclination angle other than 0 ° , suitable is.

Object of the invention

It is an object of the present invention to provide a system which overcomes the disadvantages explained above, and to provide a lifting system for assembling and dismantling torque bearings of a wind turbine, preferably a wind turbine with a rotor shaft with an inclination angle other than 0 °.

In addition, it is also the task that such a lifting system should be simple to manufacture and easy to use.

Description of the invention

• - einen Flansch mit einem Hauptkörper, der eine erste ebene Fläche aufweist, die mit Löchern versehen ist, die entlang eines Kreises angeordnet sind,
• - eine Hebehalterung, die ein erstes Ende aufweist, das über einen Befestigungsbereich an einer zweiten Fläche des Hauptkörpers des Flansches befestigt ist,

dass das zweite Ende der Hebehalterung mit mindestens einer Haupthebeöse versehen ist, das dazu eingerichtet ist, an einen Kran gehakt zu werden, wobei die Haupthebeöse außerhalb einer Gravitationsebene angeordnet ist, die den Schwerpunkt für das Momentenlager enthält, und
dass die erste ebene Fläche im Gebrauch die Ebene, in der die Hebehalterung mit dem Lager, vorzugsweise einem Innenring des Lagers in Kontakt steht, sein wird.This problem is solved with a system for load control of a wind turbine of the type mentioned in the introductory paragraph, and it is characterized in that the bearing lifting tool has the following:

• a flange with a main body having a first flat surface which is provided with holes arranged along a circle,
• a lifting bracket that has a first end that is attached to a second surface of the main body of the flange via an attachment area,

that the second end of the lifting bracket is provided with at least one main lifting eye, which is set up to be hooked onto a crane, the main lifting eye outside Gravity plane is arranged, which contains the center of gravity for the moment bearing, and
that the first flat surface in use will be the plane in which the lifting bracket is in contact with the bearing, preferably an inner ring of the bearing.

• - Bereitstellen eines Lagerhebewerkzeugs nach einem der vorhergehenden Ansprüche,
• - Verbinden des Innenrings des Momentenlagers mit den entlang eines Kreises angeordneten Löchern, während Bolzen durch die Löcher in die im Innenring des Momentenlagers vorgesehenen Gewindelöcher eingeführt werden,
• - Bereitstellen eines Anhebens oder Absenkens des Momentenlagers zwischen

Bodenniveau und der Gondel, wobei die Haupthebeöse an einen Kran gehakt ist. Die Aufgabe wird auch gelöst durch die Verwendung des erfindungsgemäßen Systems und Verfahrens zum Montieren und Demontieren eines Momentenlagers einer Windturbine.The task is also solved with a method comprising the following steps:

• Providing a storage lifting tool according to one of the preceding claims,
• Connecting the inner ring of the torque bearing to the holes arranged along a circle, while bolts are inserted through the holes into the threaded holes provided in the inner ring of the torque bearing,
• - Provision of raising or lowering the torque bearing between

Ground level and the gondola, with the main lifting eye hooked onto a crane. The object is also achieved by using the system and method according to the invention for assembling and dismantling a torque bearing of a wind turbine.

The object is also achieved by using the system and method according to the invention for assembling and dismantling a torque bearing of a wind turbine with a rotor shaft which has an inclination angle different from 0 °.

The term gravitational plane as used in the present invention means a plane which is perpendicular to the axis of rotation of the moment bearing and which contains the center of gravity of the moment bearing and which will be a vertically aligned plane when the moment bearing is arranged in a vertical position and the axis of rotation is aligned in a horizontal plane.

The torque bearing is constructed with two bearing rollers. Each of these bearing rollers will have an inner bearing ring and an outer bearing ring.

In general, it is desirable to have a certain distance between the two bearing rollers, and a moment bearing can be asymmetrical. Therefore, the gravitational plane could not be located in the middle of the moment bearing.

Since the bearing lifting tool of the system has a flange which is arranged with holes along the circle, it is possible to provide such holes with a positioning that matches the existing holes in the inner ring of a moment bearing. This is preferred because the outer ring is used for mounting in the counterpart on the main structure of the nacelle of the wind turbine.

Alternatively, it is also possible to have the holes aligned with the corresponding holes in the outer ring of a torque bearing.

It is possible to bring the flange with the first flat surface into contact with the side surface of the moment bearing and to use the holes for inserting bolts which are screwed into the threaded holes in a ring of the bearing.

This will ensure the flange that the bearing retains its 100% circular shape when lifted in the lift bracket.

The lift bracket has a first end with a mounting area through which the bracket is attached to the second surface of the main body of the flange. The second surface would be the surface facing away from the moment bearing. The area of attachment between the lift bracket and the main body would extend over the center of the circle along which the holes are located. The lifting bracket has a second end that is provided with at least one main lifting eye that is configured to be hooked onto a crane.

The flange should preferably be arranged with a substantially C-shaped curvature to ensure that there is a free space between the first end attached to the main body and the second end located outside the circle. The C-shape ensures that the bearing rings will not come into contact with the bearing lifting tool during use.

The second end of the lifting bracket is provided with one or more main lifting eyes. The eyelets are designed to be hooked onto a crane. Since the lifting eyes are located outside the gravitational plane, it is possible that the moment bearing hangs at an angle compared to a vertical orientation. Depending on the distance the main lifting eye is offset in relation to the gravitational plane, it is possible to adjust the angle.

With a correct offset positioning of the main lifting eye in relation to the gravitational plane, it is possible to obtain an angle of the moment bearings when hanging in a crane, which corresponds to the angle of inclination for an actual wind turbine. Therefore, if the torque bearing attached to the flange is assembled or disassembled, the angle of the torque bearing could simply be up the counterpart would be aligned on the main structure of the wind turbine nacelle.

A lifting bracket would have at least one main lifting eye. If more lifting eyes are provided, these would be offset at different distances from the gravitational plane. This makes it possible with a lifting bracket to adapt to different angles of inclination.

Alternatively, a main lifting eye can also be provided, which could be moved in a direction perpendicular to the gravitational plane in order to obtain a connection point of the lifting eye which could have a variable distance from the gravitational plane. This also makes it very easy to change the angle of inclination in order to adapt the lifting tool to any angle of inclination.

Normally the angle by which the main lifting eye is offset would provide an angle of approximately 6 °, since an inclination angle for a nacelle would normally be approximately 6 °. This is due to the desire to have a tower clearance for the rotor blades.

According to a further embodiment, the system according to the invention is distinguished in that the first flat surface has an annular, circular surface.

It is possible that the first flat surface of the flange could have different shapes. It is preferred that it is an annular circular surface that would provide a stable surface for contact with the inner ring of the torque bearing. Alternatively, the first flat surface could have any other shape, e.g. B. be arranged with a number of supports that provide a flat surface for contact with the ring of the moment bearing. Such supports could extend from the main body to which the lift bracket is attached.

According to a further embodiment, the system according to the invention is characterized in that the fastening region extends over a center of the circle, preferably with an extent of more than 50% of the diameter of the circle and more preferably more than 75% of the diameter of the circle. If, as explained, the fastening area extends a substantial distance over the center of the circle, it is possible to obtain a secure connection between the lifting bracket and the main body of the flange. In addition, such a construction would make it easier to get every moment that occurs in the flange when the lifting system is used and the weight of the moment bearing will cause an asymmetrical load on the bearing lifting tool.

According to a further embodiment, the system according to the invention is distinguished in that the main lifting eye is offset in the direction away from the second surface with respect to the gravitational plane. It is possible to provide the main lifting eye offset in both directions with respect to the gravitational plane. However, if the lifting eye is offset in the direction away from the second surface, it is ensured that the lifting wire of the crane would not cause any problems due to the tilting of the moment bearing when aligning the moment with the counterpart to the main structure of the nacelle.

Accordingly, it is possible to bring the torque bearing to the nacelle safely and quickly.

According to a further embodiment, the system according to the invention is distinguished in that the lifting bracket is provided with at least two main lifting eyes offset at different distances from the gravitational plane. As already mentioned, it is possible to adapt the holder to different angles of inclination by providing two or more lifting eyes which are offset from the gravitational plane at different distances.

According to a further embodiment, the system according to the invention is characterized in that the first end of the holder is provided with at least one secondary lifting eye which is arranged in the holder in a position above the center of the circle compared to the side where the main lifting eye is arranged , with the secondary lifting eye set up to be hooked onto a crane. For safe handling of the torque bearing, it is also important that not only is the lifting and alignment carried out when assembling and disassembling the torque bearing, but also that the torque bearing is safely lifted from the floor level.

If the bracket is provided with at least one secondary lifting eye in a position above the center of the circle, it is possible to use a crane hook for both the main lifting eye and the secondary lifting eye.

If the moment bearing is arranged with the floor aligned horizontally, a loop is connected to the two lifting eyes. First, a crane would slowly lift a warehouse hoist using two cranes. When lifting, a crane could gradually pull the rope detach from the second crane so that the lifting tools swing from the horizontal position to a vertical position, which is the lifting position with the slight angle compared to the vertical orientation.

Then the second crane will be disconnected, after which the moment bearing will only be hung in the main lifting eye. The moment support could now be raised to the gondola. Here the torque bearing would be aligned with the counterpart on the main structure of the nacelle.

When dismantling a moment bearing arranged in the nacelle, one would also start with the lifting tool in the horizontal position of the floor. Even in this position, there would be an initial step of lifting where a crane is connected to each of the two lifting eyes.

If the lifting tool was raised to the nacelle, it would be aligned with the moment bearing mounted in the nacelle. In this situation, the holes in the lifting tool will be aligned with the holes in the bearing ring. Then the lifting tool will be screwed to the bearing. Then the moment bearing could be detached from the gondola. This could be done in a way that is also used when dismantling the torque bearing with a system according to the prior art.

After the moment bearing was lifted off the nacelle, it would be lowered to a distance just above the floor. In this position, a crane hook is connected to the secondary lifting eye and the moment bearing would be in a horizontal position before slowly lowering it to the floor.

As can be seen from the above, the use of a secondary lifting eye would be particularly advantageous if the moment bearing is placed or raised from the floor.

It is important to note here that the torque bearing should be arranged horizontally on the floor so as not to damage the circularity.

According to a further embodiment, the system according to the invention is characterized in that stiffening ribs are provided for connecting the lifting bracket to the main body of the flange. In order to have a flange that has sufficient rigidity, it is preferred to have stiffening ribs. This makes it possible to obtain the forces that occur due to the tilted orientation when lifting and lowering the torque bearing. The stiffening ribs could be provided with an orientation that is substantially perpendicular to the orientation of the lift bracket. Alternatively, more stiffening ribs with a star-like orientation can be used, which extend radially from the center to the outer circle where the holes are provided.

It should also be noted here that the main body of the lifting bracket is preferably provided in an essentially circular shape.

According to a further embodiment, the system according to the invention is characterized in that the main body and the lifting bracket consist of plate elements which are welded together. If the main body and the lifting bracket and the stiffening ribs consist of plate elements welded together, it is possible to provide an inexpensive structure which can receive the forces which arise when the moment bearing is raised and lowered. Such a structure would be simpler and less expensive compared to a lifting tool that is provided in a mold.

According to a further embodiment, the system according to the invention is distinguished in that the second end extends to a position outside the circle along which the holes are arranged.

The second end is preferably arranged outside the circle. As a result, the lifting eye is also arranged outside the moment bearing and cannot touch the moment bearing when lifting and lowering the moment bearing hooked onto a crane. However, it may also be possible to arrange the second end and, accordingly, the main lifting eye within the circle.

According to a further embodiment, the method according to the invention is distinguished by the fact that the wind turbine has a rotor shaft with an angle of inclination different from 0 ° and that the main lifting eye is provided with a displacement from the gravitational plane, which ensures that the moment bearing is lifted at such an angle of inclination is aligned.

• - Anfängliches Abheben des Lagers vom Boden mit der Haupthebeöse und der sekundären Hebeöse, die an einen Kran gehakt sind,
• - Absenken der sekundären Hebeöse, bis das Momentenlager in der Haupthebeöse hängt, und
• - Loshaken der sekundären Hebeöse vor einem Anheben des Lagers zu der Gondel.

According to a further embodiment, the method according to the invention is distinguished in that the method for assembling the torque bearing further has the following steps:

• - Initial lifting of the warehouse from the ground with the main lifting eye and the secondary lifting eye hooked to a crane
• - lowering the secondary lifting eye until the moment bearing hangs in the main lifting eye, and
• - Unhook the secondary lifting eye before lifting the bearing to the nacelle.

As previously mentioned, the initial lifting of the bearing from the ground would be done with a crane connected to the main lifting eye and the secondary lifting eye.

If the initial lifting was done, the moment bearing would be free from the ground and then the lowering of the second lifting eye could be done until the moment bearing hangs freely in the main lifting eye. Then it is possible to unhook the secondary lifting eye. Thereafter, the lifting of the warehouse to the nacelle would be carried out by lifting the crane into the main lifting eye.

• - Anfängliches Verbinden des Krans mit der Haupthebeöse,
• - Haken der sekundären Hebeöse zu einem Kran, nachdem das Momentenlager in der Haupthebeöse zu einer Position abgesenkt wurde, kurz vor das Lager den Boden berührt,
• - Anheben der sekundären Hebeöse, bis sich das Lager in einer horizontalen Position befindet, und
• - Absenken des Lagers auf den Boden in beiden Hebeösen.

According to a further embodiment, the method according to the invention is distinguished in that the method for dismantling a torque bearing further comprises the following steps:

• - initial connection of the crane to the main lifting eye,
• Hooking the secondary lifting eye to a crane after the moment bearing in the main lifting eye has been lowered to a position just before the bearing touches the ground,
• - lifting the secondary lifting eye until the bearing is in a horizontal position, and
• - Lower the bearing to the floor in both lifting eyes.

A brief mention of the dismantling has already been explained. First, a crane hook would be connected to the main lifting eye. After the moment bearing has been removed from the nacelle and the moment bearing has been raised to a position just before it touches the ground, the secondary lifting eye would be connected to a crane.

Then a lifting would take place in the secondary lifting eye until the moment bearing is arranged in a substantially horizontal position. It is then possible to slowly lower the torque bearing to the floor by lowering it in the two lifting eyes. This ensures that the torque bearing is placed securely on the flat horizontal surface.

Note that the above embodiments are only examples and that it is possible to have embodiments other than those described. Several embodiments are possible within the scope of the claims. It is important that it is possible to raise and lower the torque bearing using a lifting tool that provides the inclined orientation of the torque bearing. Such a structure will ensure that the moment bearing could be assembled and disassembled efficiently, and since the time to align the moment bearing with the counterpart to the main structure of the nacelle is reduced, the total time to assemble and disassemble is also reduced.

Figure list

• 1 eine perspektivische Ansicht einer Windturbine,
• 2 ein Momentenlager,
• 3 ein Lagerhebewerkzeug, in dem ein Momentenlager montiert ist,
• 4 eine Ansicht in einer ersten Richtung eines Lagerhebewerkzeugs,
• 5 ein Hebewerkzeug betrachtet in eine Richtung senkrecht zur Ansicht von 4,
• 6 eine vergrößerte Ansicht eines Teils des Lagerhebewerkzeugs,
• 7 eine schematische Ansicht einer Windturbine, die einen Neigungswinkel darstellt, und
• 8 einen Querschnitt durch ein Momentenlager.

An embodiment of the invention will now be described by way of example only and with reference to the accompanying drawings. The drawing shows:

• 1 a perspective view of a wind turbine,
• 2 a moment camp,
• 3 a bearing lifting tool in which a torque bearing is mounted,
• 4 a view in a first direction of a bearing lifting tool,
• 5 a lifting tool viewed in a direction perpendicular to the view of 4 .
• 6 an enlarged view of a part of the bearing lifting tool,
• 7 is a schematic view of a wind turbine, which represents an angle of inclination, and
• 8th a cross section through a torque bearing.

Detailed description of the invention

The figures are described individually below, and the various parts and positions seen in the figures are numbered with the same numbers in the various figures. Not all parts and positions given in a particular figure are necessarily discussed with that figure.

Reference list

1

Wind turbine

2

Tower of the wind turbine

3

foundation

4

gondola

5

Rotor hub

6

Rotor blade of the wind turbine

7

First end of the sheet (foot end)

8th

second end of the sheet (tip end)

9

Torque bearings

10

Inner ring

11

Outer ring

12th

Holes in the inner ring

13

Holes in the outer ring 14 eyelet fixation

15

Warehouse lifting tool

16

flange

17

bracket

18th

first flat surface

19

circle

20th

hole

21

First end

22

Second end

23

second area

24

Fastening area

25

Main lifting eye

26

Gravitational plane

27

main emphasis

28

Middle of the circle ( 19 )

29

Distance (between main lifting eye and gravitational plane)

30

Secondary lifting eye

31

Stiffening rib

32

Main body (of flange)

33

Angle of inclination

34

Storage role

35

Axis of rotation

Detailed description of the invention

In 1 is a typical wind turbine 1 depicted a tower 2 has on a foundation 3 is installed. At the top of the tower 2 is a gondola 4 to see, which has, for example, a transmission, a generator and other components. At the gondola 4 is also a shaft for carrying a rotor with a hub 5 and three rotor blades 6 the wind turbine installed. The rotor blades 6 are on the hub 5 at a first end 7 arranged that as the foot end of the rotor blade 6 referred to as. The second end 8th of the rotor blades 6 forms a tip end.

2 shows a moment bearing 9 that has an inner ring 10 and an outer ring 11 having. The inner ring is with holes 12 provided, which are arranged along a circle (see 4 ). The outer ring also has a number of holes 13 on.

The holes 13 in the outer ring 11 are used to attach the torque bearing to the counterpart on the main structure of the nacelle 4 the wind turbine. The holes 12 in the inner ring are along a circle 19 arranged (see 4 ). The holes 12 are threaded.

In the holes 12 There are three eyelet fixings in the inner ring 14 evenly spaced. These eyelet fixings are used to raise the moment bearing and to place the moment bearing on a flat surface when the moment bearing is placed in a horizontal position before lifting to the nacelle 4 is started.

If the moment camp 9 Arranged in a horizontal position on a flat and dry platform, it is with a storage lifting tool 15 connected, which is explained below.

3 illustrates the warehouse lifting tool 15 , This tool includes a flange 16 and a bracket 17 , The flange has a first flat surface 18th on (see 5 ). On the first flat surface 18th are holes 20th along a circle 19 arranged (see 4 ). The holes 20th are arranged at positions that correspond to the holes 12 in the inner ring 10 correspond.

The lifting bracket 17 has a first end 21 and a second end 22 on. The first end 21 is on a second surface 23 of the main body 32 of the flange 16 attached. The attachment takes place through an attachment area 24 , This area extends over a substantial part of the diameter of the flange 16 , This uses a large area for attachment that gives a secure and strong connection. In addition, stiffening ribs 31 used to stiffen the bracket 17 to effect, since it consists of plate elements.

At the first end 21 it is attached by welding to the main body 32 of the flange 16 ,

At the second end 22 the bracket 17 is a main lifting eye 25th intended. The main lifting eye 25th is set up to be hooked onto a crane.

The 4 and 5 show the bearing lifting tool 15 seen from two mutually perpendicular directions.

Here it can be seen that the main lifting eye 25th at a distance 29 is provided by a plane called the gravitational plane 26 is referred to as the focus 27 for the moment bearing (see 8th ).

4 illustrates the circle 19 along which the holes 20th are arranged. This circle 19 has a center 28 on. It can be seen that the bracket 17 about the center 28 extends. The bracket 17 is at the first end 21 with a secondary lifting eye 30th Mistake. Like from the 4 and 5 emerges is the secondary lifting eye 30th compared to the positioning of the main lifting eye 25th on the opposite side of the center 28 arranged.

If the torque bearing in both lifting eyes 25th . 30th is raised, it is thus possible to arrange it in a horizontal position, as will be explained later.

6 shows an enlarged view of the second end 22 the bracket 17 , This view shows that there are two main lifting eyes 25th are provided. These two lifting eyes are at different distances from the gravitational plane 26 arranged (see 5 ).

7 shows a wind turbine in which the nacelle 4 with an angle of inclination 33 is arranged. This angle of inclination 33 is a positive angle representing the height of the hub 5 increase and also a better tower clearance is obtained since the blades would be oriented away from the tower.

8th illustrates a cross section through a torque bearing 9 , It can be seen that for the moment bearing 9 two bearing rollers 34 be used. In this situation there is a gravitational plane in the middle plane 26 arranged. However, this gravitational plane can be offset if the bearing rollers have a different size and thus also a different weight.

8th illustrates the situation in which the moment bearing is arranged in a vertical orientation of the gravitational plane and in which the moment bearing has an axis of rotation 35 has, which is aligned in a horizontal plane. In this position the focus will be 27 be arranged in the middle of the moment bearing.

However, if the torque bearing is arranged at an angle different from the vertical, the center of gravity becomes 27 either to the right or to the left, as in 8th you can see.

This shift in focus 27 is used to adjust the position of the torque bearing to an angle - related to a vertical plane - that of the angle of inclination 33 equivalent.

If the lifting system according to the invention is used for lifting a moment bearing, the arrangement of the main lifting eye is outside the gravitational plane 26 cause an alignment that differs from a vertical position of the torque bearing. This difference from the horizontal position can affect the actual angle of inclination 33 can be adjusted, which makes it easier to mount the torque bearing in the counterpart on the main structure of the wind turbine.

When assembling and disassembling the torque bearing 9 becomes the bearing lifting tool 15 on the inner ring 10 of the torque bearing attached. This is done with bolts that go into the threaded holes 12 intervention.

On the main lifting eye 25th and the secondary lifting eye 30th a crane is hooked. When the moment bearing is lifted off the floor, the crane connected to the secondary lifting eye is lowered, and when the moment bearing is free in the main lifting eye 25th hangs, the crane is suspended from the secondary lifting eye 30th replaced. In this position, the torque bearing is due to the offset position of the main lifting eye 25th compared to the gravitational plane 26 be arranged at an angle different from the vertical.

In this way, the torque bearing is raised from the floor level to the gondola. Here it will be aligned with the counterpart of the gondola and assembled in a conventional manner when the outer ring is attached to the main structure of the gondola.

When removing a torque bearing 9 from the gondola 4 the moment bearing is in the main lifting eye up to a position slightly above ground level 25th lowered. A second crane is on the secondary lifting eye 30th attached and lifting is carried out until the moment bearing 9 is arranged in the substantially horizontal position. This is possible because the main lifting eye 25th and the secondary lifting eye 30th on each side of the center 28 of the circle 19 are provided on the bearing lifting tool 15 is attached to the torque bearing.

In this way, the torque bearing is lowered until it is arranged on a flat horizontal surface. In this position it is Warehouse lifting tool 15 detached from the crane and the moment bearing.

As can be seen from the above, when lifting and lowering a torque bearing, it is possible to establish a strong connection between the flange and the inner ring of the torque bearing. This ensures that the torque bearing will maintain its circular shape.

It is noted that the embodiments illustrated above are examples and that modifications are possible. It is also possible to combine the features of different embodiments.

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 2226496 A2 [0008]

Claims (15)

Lifting system for torque bearings of a wind turbine with a nacelle, which has a main structure, a rotor, the rotor having at least two rotor blades, each of which is mounted on a rotor hub via a foot end of the rotor blade, the rotor hub being connected to a torque bearing, the system a bearing lifting tool, characterized in that the bearing lifting tool comprises the following: a flange with a main body, which has a first flat surface provided with holes arranged along a circle, - a lifting bracket, which has a first end which is fastened via a fastening area to a second surface of the main body of the flange, that the second end of the lifting bracket is provided with at least one main lifting eye, which is designed to be hooked onto a crane, the main lifting eye being arranged outside a gravitational plane that are the focus for the Momen contains, and that the first flat surface in use will be the plane in which the lifting bracket is in contact with the bearing, preferably an inner ring of the bearing. System according to Claim 1 , characterized in that the first flat surface has an annular circular surface. System according to Claim 1 or 2 , characterized in that the fastening area extends over a center of the circle, preferably with an extent of more than 50% of the diameter of the circle and more preferably more than 75% of the diameter of the circle. System according to one of the preceding claims, characterized in that the main lifting eye is offset with respect to the gravitational plane in the direction away from the second surface. System according to one of the preceding claims, characterized in that the lifting bracket is provided with at least two main lifting eyes offset at different distances from the gravitational plane. System according to one of the preceding claims, characterized in that the first end of the holder is provided with at least one secondary lifting eye which is arranged in the holder in a position above the center of the circle compared to the side where the main lifting eye is arranged , with the secondary lifting eye set up to be hooked onto a crane. System according to one of the preceding claims, characterized in that stiffening ribs are provided for connecting the lifting bracket to the main body of the flange. System according to one of the preceding claims, characterized in that the main body and the lifting bracket consist of plate elements which are welded together. System according to one of the preceding claims, characterized in that the second end extends to a position outside the circle along which the holes are arranged. Method for assembling and disassembling a torque bearing of a wind turbine with a nacelle, which has a main structure, a rotor, the rotor comprising at least two rotor blades, each of which is mounted on a rotor hub via a foot end of the rotor blade, the rotor hub having a torque bearing with a Main shaft is connected, the method comprising the following steps: Providing a storage lifting tool according to one of the preceding claims, Connecting the inner ring of the torque bearing to the holes arranged along a circle, while bolts are inserted through the holes into the threaded holes provided in the inner ring of the torque bearing, - Providing a raising or lowering of the moment bearing between the floor level and the nacelle, the main lifting eye being hooked on a crane. Procedure according to Claim 10 , characterized in that the wind turbine has a rotor shaft with an angle of inclination different from 0 ° and that the main lifting eye is provided with a displacement from the gravitational plane, which ensures that the torque bearing is aligned with such an angle of inclination when lifting. Procedure according to Claim 10 or 11 , characterized in that the method for Assembling the moment bearing further comprises the following steps: - initial lifting of the bearing from the ground with the main lifting eye and the secondary lifting eye, which are hooked to a crane, - lowering the secondary lifting eye until the moment bearing hangs in the main lifting eye, and - unhooking the secondary Lifting eye before lifting the bearing to the nacelle. Procedure according to Claim 10 or 11 , characterized in that the method for dismantling the torque bearing further comprises the following steps: - initially connecting the crane to the main lifting eye, - hooking the secondary lifting eye to a crane after the torque bearing in the main lifting eye has been lowered to a position shortly before Bearing touches the ground, - raise the secondary lifting eye until the bearing is in a horizontal position, and - lower the bearing to the ground in both lifting eyes. Use of a system according to one of the preceding Claims 1 to 9 and a method according to one of the Claims 10 to 13 for assembling and disassembling a torque bearing of a wind turbine. Using a system after Claim 14 , characterized in that the wind turbine has a rotor shaft with an inclination angle different from 0 °.

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