Shafting, transmission chain, wind generating set and shafting maintenance method

Abstract

The invention provides a shafting, a transmission chain, a wind generating set and a shafting maintenance method, the shafting comprises a rotating shaft, a first bearing seat and a first radial bearing, and a flange protruding and extending outwards is arranged at the first end of the rotating shaft; the first bearing seat comprises a first bearing end cover, a second bearing end cover and an outer barrel, the first bearing end cover and the second bearing end cover are arranged on the two sides of the flange respectively, the first bearing end cover is used for being connected to a box body of a gearbox of the wind generating set, and the second bearing end cover is detachably connected with the outer barrel; the outer cylinder extends from the first bearing end cover to one side of the second bearing end cover in the axial direction of the rotating shaft, so that the outer cylinder is located on the radial outer side of the flange. The first radial bearing comprises a plurality of first radial sliding blocks, the first radial sliding blocks are arranged between the radial outer side of the flange and the outer cylinder body at intervals in the circumferential direction, and the first radial sliding blocks are connected to the outer cylinder body, so that the overhauling difficulty and the operation and maintenance cost of the shaft system are reduced.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of wind power generation, and particularly relates to a shafting, a drive train, a wind turbine generator set, and a maintenance method for the shafting. Background Art

[0002] Currently, rolling bearings are usually selected as the main bearings of wind turbine generator sets. As the load of wind turbine generator sets increases, the size of the rolling bearings also increases accordingly. For example, the diameter of some rolling bearings reaches 4m. However, as the size of the rolling bearings increases, the processing difficulty of the rolling bearings becomes greater and greater, and their manufacturing cost will become higher and higher; moreover, the operation and maintenance after the rolling bearings are hoisted onto the tower are very difficult. When the rolling bearings fail, they need to be repaired after being lowered from the tower, which brings huge operation and maintenance costs.

[0003] Currently, using sliding bearings instead of rolling bearings as the main bearings has gradually become the design trend of the shafting. How to reduce the operation and maintenance costs of the shafting is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] The main purpose of the present disclosure is to provide a shafting, a drive train, a wind turbine generator set, and a maintenance method for the shafting, so as to reduce the operation and maintenance costs of the wind turbine generator set.

[0005] For the above purpose, the present disclosure provides the following technical solutions:

[0006] In the first aspect of the present disclosure, a shafting applicable to a wind turbine generator set is provided. The shafting includes a rotating shaft, a first bearing housing, and a first radial bearing. A flange protruding outward is provided at the first end of the rotating shaft; the first bearing housing includes a first bearing end cover, a second bearing end cover, and an outer cylinder. The first bearing end cover and the second bearing end cover are respectively arranged on both sides of the flange. The first bearing end cover is used for connecting to the housing of the gearbox of the wind turbine generator set. The second bearing end cover is detachably connected to the outer cylinder. The outer cylinder extends axially along the rotating shaft from the side of the first bearing end cover towards the second bearing end cover, so that the outer cylinder is located radially outside the flange; the first radial bearing includes a plurality of first radial sliders. The plurality of first radial sliders are arranged at intervals in the circumferential direction between the radially outer side of the flange and the outer cylinder, and the first radial sliders are connected to the outer cylinder.

[0007] With such a setting, the second bearing end cover is detachably connected to the outer cylinder. After removing the second bearing end cover, the first radial slider can be moved axially along the rotating shaft so that the first radial slider can be removed from the shafting for maintenance and replacement. In this way, the first radial slider can be removed from the tower without having to remove the entire first bearing assembly composed of the first bearing housing, the second bearing end cover, and the first radial slider and lower it from the tower, thereby reducing the maintenance difficulty and operation and maintenance cost of the shafting.

[0008] In an exemplary embodiment of the present disclosure, the shafting further includes a first axial bearing disposed between the flange and the second bearing end cover, and the first axial bearing is connected to the second bearing end cover. With such a setting, the first axial bearing and the second bearing end cover are connected together. When the second bearing end cover is removed, the first axial bearing will leave the shafting together with the second bearing end cover, thus improving the removal efficiency of the first axial bearing and further reducing the operation and maintenance cost of the shafting. Further, in the shafting provided by the present disclosure, the first radial slider can be used to bear the radial load of the rotating shaft, and the second axial bearing is used to bear the axial load of the rotating shaft, so that the shafting can bear loads in multiple directions and improve the bearing capacity of the shafting.

[0009] Optionally, the shafting further includes a second axial bearing disposed between the flange and the first bearing end cover. With such a setting, the second axial bearing and the first axial bearing are respectively disposed on both axial sides of the flange along the rotating shaft. By means of the first axial bearing and the first axial bearing, the shafting can bear the axial load along the rotating shaft, thereby improving the axial bearing capacity of the shafting.

[0010] Specifically, the second axial bearing is fixedly connected to the rotating shaft. Wherein, on the circumference radially corresponding to the second axial bearing, a maintenance through hole is provided on the outer cylinder, and the second axial bearing can be taken out through the maintenance through hole. The shafting further includes a maintenance cover detachably installed on the maintenance through hole.

[0011] In this way, when the second axial bearing needs to be replaced, the maintenance cover can be first removed from the outer cylinder, and then the rotating shaft is rotated so that the second axial bearing can rotate relative to the outer cylinder to make the second axial bearing and the maintenance through hole radially aligned. At this time, the second axial bearing can be taken out through the maintenance through hole, and thus the disassembly and assembly of the second axial bearing can be realized.

[0012] In another exemplary embodiment of the present disclosure, the rotating shaft has a hollow rotating shaft inner cavity, and the rotating shaft has a first connection hole. A first fastener passes through the first connection hole and is fixedly connected to the second axial bearing to fix the second axial bearing on the rotating shaft.

[0013] Further, a second connection hole is provided on the outer cylinder body, which penetrates the outer cylinder body and extends radially. A second fastener passes through the second connection hole and is connected to the first radial slider to fix the first radial slider on the outer cylinder body. This setting facilitates the disassembly and assembly operation of the first radial slider and increases the possibility of disassembling and assembling the first radial slider on the tower.

[0014] Optionally, the shafting further includes a second bearing seat, a plurality of second radial sliders, and a third bearing end cover. The second bearing seat and the first bearing seat are arranged at intervals along the axial direction. The plurality of second radial sliders are arranged at intervals along the circumferential direction of the rotating shaft between the second bearing seat and the rotating shaft. The third bearing end cover is located on the side of the second bearing seat facing the first bearing seat and is detachably connected to the second bearing seat.

[0015] In this embodiment, the third bearing end cover is detachably connected to the second bearing seat. After removing the third bearing end cover, the second radial slider can be moved along the axial direction of the rotating shaft to remove the second radial slider from the shafting without removing the second bearing seat, which simplifies the disassembly and assembly process of the second radial slider and thus reduces the maintenance difficulty and operation and maintenance cost of the shafting.

[0016] Specifically, a third connection hole is provided on the second bearing seat, and a third fastener passes through the third connection hole and is connected to the second radial slider to fix the second radial slider on the second bearing seat.

[0017] Further, the second bearing end cover includes at least two first end cover segments, and the at least two first end cover segments are connected end to end along the circumferential direction of the rotating shaft to form a ring. When it is necessary to disassemble the second bearing end cover, it is only necessary to remove the fastener between the first end cover segment and the outer cylinder body. Compared with the integral ring-shaped second bearing end cover, it is not necessary to move the second bearing end cover a long distance along the axial direction of the rotating shaft, thereby reducing the disassembly and assembly difficulty of the second bearing end cover.

[0018] The shafting further includes a second bearing seat, a plurality of second radial sliders, and a third bearing end cover. The second bearing seat and the first bearing seat are arranged at intervals along the axial direction. The plurality of second radial sliders are arranged at intervals along the circumferential direction of the rotating shaft between the second bearing seat and the rotating shaft. The third bearing end cover is located on the side of the second bearing seat facing the first bearing seat and is detachably connected to the second bearing seat. The third bearing end cover includes at least two second end cover segments, and the at least two second end cover segments are connected end to end along the circumferential direction of the rotating shaft to form a ring.

[0019] Compared with the integral ring-shaped third bearing end cover, the second end cover segments provided in this embodiment are convenient for disassembly and assembly and do not need to be moved a long distance along the axial direction of the rotating shaft, thereby reducing the disassembly and assembly difficulty of the third bearing end cover.

[0020] In a second aspect of the present disclosure, a transmission chain is provided, which includes a gearbox and a shaft system connected to the gearbox as described above. The gearbox is disposed at a first end of the rotating shaft. The gearbox includes a box body and an input shaft disposed in the box body. The box body is fixedly connected to the first bearing seat, and the input shaft is fixedly connected to the rotating shaft.

[0021] In a third aspect of the present disclosure, a wind turbine generator is provided. The wind turbine generator includes the transmission chain as described above, and the rotating shaft is the main shaft of the wind turbine generator.

[0022] In a fourth aspect of the present disclosure, a maintenance method for a shaft system is provided. The shaft system is the shaft system as claimed in claim 1. The maintenance method for the shaft system includes:

[0023] Detach the second bearing end cover from the outer cylinder to expose the first radial slider;

[0024] Detach the first radial slider from the outer cylinder;

[0025] Move the first radial slider axially toward the side away from the gearbox and detach it.

[0026] With such a setting, since the second bearing end cover is detachably connected to the outer cylinder, after removing the second bearing end cover, the first radial slider can be moved axially along the rotating shaft so that the first radial slider can be removed from the shaft system for maintenance and replacement. In this way, the first radial slider can be removed from the tower without having to remove the entire first bearing assembly composed of the first bearing seat, the second bearing end cover, and the first radial slider and lower it down the tower, thereby reducing the maintenance difficulty and operation and maintenance cost of the shaft system.

[0027] In an exemplary embodiment of the present disclosure, the shaft system further includes a maintenance through hole opened on the outer cylinder. The shaft system further includes a second axial bearing disposed between the flange and the first bearing end cover. The second axial bearing can be taken out through the maintenance through hole. The shaft system further includes a maintenance cover body detachably installed on the maintenance through hole. The maintenance method for the shaft system further includes:

[0028] Detach the maintenance cover body from the outer cylinder;

[0029] Rotate the rotating shaft to align the second axial bearing with the maintenance through hole;

[0030] Detach the second axial bearing from the rotating shaft;

[0031] Take out the second axial bearing from the maintenance through hole.

[0032] Optionally, the shafting further includes a second bearing housing, a plurality of second radial sliders, and a third bearing end cover. Among them, the second bearing housing and the first bearing housing are arranged at intervals along the axial direction. The plurality of second radial sliders are arranged at intervals along the circumferential direction of the rotating shaft between the second bearing housing and the rotating shaft. The third bearing end cover is located on the side of the second bearing housing facing the first bearing housing and is detachably connected to the second bearing housing. The maintenance method of the shafting further includes:

[0033] Detach the third bearing end cover from the second bearing housing;

[0034] Detach the second radial sliders from the second bearing housing;

[0035] Move the second radial sliders axially towards the first bearing housing and detach them. Description of the Drawings

[0036] Through the description of the embodiments in conjunction with the drawings below, the above and / or other objects and advantages of the present disclosure will become clearer, where:

[0037] Figure 1 is a longitudinal sectional view of the shafting provided by an exemplary embodiment of the present disclosure.

[0038] Figure 2 is Figure 1 a schematic diagram of the circumferential arrangement of the split first end cover in

[0039] Figure 3 is Figure 1 a partial structural explosion view after the second bearing end cover and the maintenance cover are removed in

[0040] Figure 4 is Figure 1 a partial structural explosion view after the third bearing end cover is removed in

[0041] Description of the Reference Numerals:

[0042] 1, rotating shaft; 2, first bearing assembly;

[0043] 3, gearbox; 4, second bearing assembly;

[0044] 11, flange; 12, shaft shoulder;

[0045] 21, outer cylinder; 22, first slider support;

[0046] 23, first radial slider; 24, second bearing end cover;

[0047] 25, first axial bearing; 26, maintenance cover;

[0048] 27. Second axial bearing; 28. Second fastener;

[0049] 29. First bearing end cover; 30. First fastener;

[0050] 41. Second bearing housing; 42. Second slider support;

[0051] 43. Second radial slider; 44. Fourth bearing end cover;

[0052] 45. Third bearing end cover; 46. Third fastener;

[0053] 241. First end cover split. Detailed implementation mode

[0054] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the embodiments of the present disclosure should not be construed as being limited to the embodiments set forth herein. Identical reference numerals in the figures denote identical or similar structures, and thus their detailed descriptions will be omitted.

[0055] In one aspect of the present disclosure, a wind turbine is provided, which includes a tower, a generator disposed at the top of the tower, an impeller, and a transmission chain. The transmission chain is disposed between the impeller and the generator. The impeller is rotatably disposed at the top of the tower. One end of the transmission chain is connected to the impeller, and the other end is connected to the rotor of the generator to transmit the rotation of the impeller to the generator through the transmission chain for power generation.

[0056] The wind turbine provided by the present disclosure can be a land wind turbine or an offshore wind turbine, but is not limited thereto.

[0057] Referring to Figure 1 , the transmission chain provided by the present disclosure includes a gearbox 3 and a shafting. The shafting includes a rotating shaft 1. The gearbox 3 includes a housing and an input shaft rotatably disposed in the housing. Wherein, the gearbox 3 is disposed at the first end of the rotating shaft 1, and the gearbox 3 is located between the rotating shaft 1 and the generator. For example, but not limited to, the input shaft of the gearbox 3 is fixedly connected to the first end of the rotating shaft 1 to be able to transmit the rotation of the impeller to the gearbox 3 through the rotating shaft 1, and then to the rotor of the generator.

[0058] The shafting includes a rotating shaft 1, a first bearing housing, and a first radial bearing. A flange 11 protruding outwardly is provided at the first end of the rotating shaft 1.

[0059] Referring to Figure 1 and Figure 3 , in this embodiment, the flange 11 protrudes radially outward from the outer peripheral wall of the rotating shaft 1 and extends continuously along the circumferential direction of the rotating shaft 1 to form a ring, but is not limited thereto.

[0060] In this embodiment, the first bearing housing includes a first bearing end cover 29, a second bearing end cover 24, and an outer cylinder 21. The first bearing end cover 29 and the second bearing end cover 24 are respectively arranged on the axial two sides of the flange 11. The first bearing end cover 29 is used for connecting to the housing of the gearbox 3, and the second bearing end cover 24 is detachably connected to the outer cylinder 21. The outer cylinder 21 extends axially along the axis of the rotating shaft 1 from the side of the first bearing end cover 29 facing the second bearing end cover 24, so that the outer cylinder 21 is located radially outside the flange 11.

[0061] In the present disclosure, the first bearing housing is connected to the gearbox 3. For example, but not limited to, the gearbox 3 and the first bearing housing are connected by fasteners, so that the gearbox 3 and the first bearing housing are rigidly connected, improving the integration degree of the transmission chain and thus reducing the manufacturing cost.

[0062] As an example, the first bearing end cover 29 and the outer cylinder 21 are integrally formed, improving the connection strength between the first bearing end cover 29 and the outer cylinder 21. However, this is not a limitation. According to needs, the first bearing end cover 29 and the outer cylinder 21 can be separately formed and then connected together by welding or fastener connection.

[0063] The first radial bearing includes a plurality of first radial sliders 23. The plurality of first radial sliders 23 are arranged at intervals in the circumferential direction between the radially outer side of the flange 11 and the outer cylinder 21. The first radial sliders 23 are connected to the outer cylinder 21, for example, but not limited to, the radially inner side of the outer cylinder 21. In this way, by arranging the first radial sliders 23 between the flange 11 and the outer cylinder 21 and connecting the first radial sliders 23 to the radially inner side wall of the outer cylinder 21, the flange 11 is rotatably slidably engaged with the first radial sliders 23.

[0064] In this embodiment, the flange 11 extends radially outwardly from the outer peripheral wall of the rotating shaft 1 and is integrally formed with the rotating shaft 1, improving the structural strength of the flange 11 and the rotating shaft 1.

[0065] Further, continue to refer to Figure 1 and Figure 3 , the second bearing end cover 24 is arranged on the side of the flange 11 facing away from the first bearing end cover 29. In this way, the second bearing end cover 24 and the first bearing end cover 29 are respectively arranged on the axial two sides of the outer cylinder 21, and the second bearing end cover 24 is detachably connected to the outer cylinder 21. In this embodiment, by connecting the second bearing end cover 24 and the outer cylinder 21, a closed chamber is formed between the first bearing housing and the rotating shaft 1. The first radial sliders 23 are arranged in this closed chamber. For example, but not limited to, lubricating oil can also be arranged in this closed chamber to improve the lubricity between the first radial sliders 23 and the flange 11, thereby improving the reliability of the shafting operation.

[0066] In this way, the second bearing end cover 24 is detachably connected to the outer cylinder body 21. After the second bearing end cover 24 is removed (as Figure 3 shown), the first radial slider 23 can be axially moved along the rotating shaft 1 so that the first radial slider 23 can be removed from the shafting for maintenance and replacement. In this way, the first radial slider 23 can be removed from the tower without having to remove the entire first bearing assembly 2 composed of the first bearing seat and the first radial slider 23, etc., and lowering the tower, thereby reducing the maintenance difficulty and operation and maintenance cost of the shafting.

[0067] As an example, the second bearing end cover 24 is connected to the outer cylinder body 21 by fasteners, but not limited thereto. As an example, the second bearing end cover 24 is provided against the end of the outer cylinder body 21, but not limited thereto. Specifically, the circumferential edge of the second bearing end cover 24 is provided with mounting holes for installing fasteners, and the side of the circumferential edge facing the flange 11 abuts against the end of the outer cylinder body 21, but not limited thereto. A convex portion is provided in the middle of the second bearing end cover 24 facing the flange 11, and the first axial bearing 25 (described below) is fixed to the convex portion, but not limited thereto.

[0068] Referring to Figure 2 , in order to reduce the disassembly and assembly difficulty of the second bearing end cover 24, the second bearing end cover 24 includes at least two first end cover segments 241, and the at least two first end cover segments 241 are connected end to end along the circumference of the rotating shaft 1 to form a ring. When the second bearing end cover 24 needs to be disassembled, the fasteners between the first end cover segment 241 and the outer cylinder body 21 can be removed. Compared with the integral annular second bearing end cover 24, it is not necessary to axially move the second bearing end cover 24 a long distance along the rotating shaft 1, thereby reducing the disassembly and assembly difficulty of the second bearing end cover 24.

[0069] Continuing to refer to the drawings, the outer cylinder body 21 is provided with a second connection hole that penetrates the outer cylinder body 21 and extends radially. The second fastener 28 passes through the second connection hole and is connected to the first radial slider 23 to fix the first radial slider 23 on the outer cylinder body 21.

[0070] In this way, the second fastener 28 penetrates the radial outer surface and the radial inner surface of the outer cylinder body 21, and the second fastener 28 can be screwed on the outside of the outer cylinder body 21. In this way, the radially inner end of the second fastener 28 can be disposed within the first radial slider 23 to fix the first radial slider 23 on the outer cylinder body 21, or the second fastener 28 can be screwed on the outside of the outer cylinder body 21 to separate the radially inner end of the second fastener 28 from the first radial slider 23, so that the first radial slider 23 is separated from the outer cylinder body 21.

[0071] In this way, the disassembly and assembly operation of the first radial slider 23 is facilitated, and the possibility of disassembling and assembling the first radial slider 23 on the tower is improved.

[0072] As an example, the radially inner end of the second fastener 28 is provided with an external thread, and the radially inner end of the second fastener 28 can be threadedly connected to the first radial slider 23, which improves the connection reliability between the first radial slider 23 and the outer cylinder 21, but is not limited thereto. Optionally, the second fastener 28 includes a bolt, or the second fastener 28 includes a bolt and a sleeve sleeved outside the bolt. By providing a sleeve outside the bolt, the shear resistance of the second fastener 28 can be improved, but is not limited thereto.

[0073] As needed, the second connection hole can be a threaded hole or a clearance hole. In this embodiment, the second connection hole is taken as an example of a clearance hole for illustration, but is not limited thereto.

[0074] Continuing to refer to the drawings, the shafting further includes a first slider support 22, which is disposed between the outer cylinder 21 and the first radial slider 23. The first slider support 22 can provide elasticity for the first radial slider 23, so that when the rotating shaft 1 bears the wind turbine load, the first radial slider 23 can deflect adaptively, but is not limited thereto.

[0075] Furthermore, in order to improve the load-bearing capacity of the shafting, the shafting further includes a first axial bearing 25. The first axial bearing 25 is disposed between the flange 11 and the second bearing end cover 24, and the first axial bearing 25 is connected to the second bearing end cover 24, so that the flange 11 can rotate relative to the first axial bearing 25.

[0076] In this way, the first axial bearing 25 and the second bearing end cover 24 are connected together. When the second bearing end cover 24 is removed, the first axial bearing 25 will leave the shafting together with the second bearing end cover 24, thus improving the removal efficiency of the first axial bearing 25 and further reducing the operation and maintenance cost of the shafting. Further, in the shafting provided by the present disclosure, the first radial slider 23 can be used to bear the radial load of the rotating shaft 1, and the first axial bearing 25 is used to bear the axial load of the rotating shaft 1, so that the shafting can bear loads in multiple directions and improve the load-bearing capacity of the shafting.

[0077] As an example, continuing to refer to Figure 1 , the first axial bearing 25 is disposed on the left side of the flange 11, and the left axial end of the first axial bearing 25 abuts against the second bearing end cover 24. There is a clearance between the right axial end of the first axial bearing 25 and the flange 11. During the rotation of the rotating shaft 1, the flange 11 can rotate relative to the first axial bearing 25. When the rotating shaft 1 bears an axial load, the first axial bearing 25 can be in frictional contact with the side wall of the flange 11, but is not limited thereto.

[0078] Further, the shafting further includes a second axial bearing 27, which is arranged between the flange 11 and the first bearing end cover 29. In this way, the second axial bearing 27 and the first axial bearing 25 are respectively arranged on the two axial sides of the flange 11 along the axis of the rotating shaft 1. Through the second axial bearing 27 and the first axial bearing 25, the shafting can bear the axial load along the rotating shaft 1, improving the axial load-bearing capacity of the shafting.

[0079] Continue to refer to Figure 1 and Figure 3 , the second axial bearing 27 is fixedly connected to the rotating shaft 1. On the circumference radially corresponding to the second axial bearing 27, a maintenance through-hole is provided on the outer cylinder 21. The second axial bearing 27 can be taken out through the maintenance through-hole. The shafting further includes a maintenance cover 26 detachably installed on the maintenance through-hole.

[0080] In this way, when the second axial bearing 27 needs to be replaced, the maintenance cover 26 can be first removed from the outer cylinder 21 (as Figure 3 shown), and then the rotating shaft 1 is rotated so that the second axial bearing 27 can rotate relative to the outer cylinder 21 to make the second axial bearing 27 and the maintenance through-hole radially aligned. At this time, the second axial bearing 27 can be taken out through the maintenance through-hole, so that the disassembly and assembly of the second axial bearing 27 can be realized.

[0081] For the convenience of disassembly and assembly of the second axial bearing 27, the second axial bearing 27 is connected to the rotating shaft 1 through a first fastener 30, so that the second axial bearing 27 can rotate relative to the outer cylinder 21 together with the rotating shaft 1, so that multiple second axial bearings 27 can be respectively aligned with the maintenance through-hole and removed in sequence, improving the possibility of disassembling and assembling the second axial bearing 27 on the tower.

[0082] As an example, the second axial bearing 27 is arranged between the flange 11 and the first bearing end cover 29. Refer to Figure 1 , the second axial bearing 27 is arranged on the right side of the flange 11, and the left end of the shaft of the second axial bearing 27 abuts against the flange 11, and there is a clearance between the right end of the shaft of the second axial bearing 27 and the first bearing end cover 29, so that the second axial bearing 27 can rotate relative to the first bearing end cover 29 together with the rotating shaft 1. When the rotating shaft 1 bears an axial load, the second axial bearing 27 can contact and rub against the first bearing end cover 29, but not limited to this.

[0083] As an example, refer to Figure 1, the rotating shaft 1 has a hollow rotating shaft inner cavity. The rotating shaft 1 has a first connection hole, and a first fastener 30 passes through the first connection hole and is fixedly connected to the second axial bearing 27 to fix the second axial bearing 27 on the rotating shaft 1. As an example, the first connection hole can penetrate through the radial two sides of the rotating shaft 1. For example but not limited to, the first fastener 30 can be inserted into the first connection hole from the inner cavity of the rotating shaft and further connected to the second axial bearing 27, but it is not limited thereto.

[0084] In this embodiment, an external thread can be provided at the radially outer end of the first fastener 30, and the radially outer end of the first fastener 30 can be threadedly connected to the second axial bearing 27, improving the connection reliability between the second axial bearing 27 and the rotating shaft 1. Optionally, the first fastener 30 includes a bolt, or the first fastener 30 includes a bolt and a sleeve sleeved outside the bolt. By providing a sleeve outside the bolt, the shear resistance of the first fastener 30 can be improved, but it is not limited thereto.

[0085] According to requirements, the first connection hole can be a threaded hole or a clearance hole. In this embodiment, the first connection hole is taken as an example of a clearance hole for illustration, but it is not limited thereto.

[0086] Referring to Figure 1 and Figure 4 , the shafting further includes a second bearing housing 41, a plurality of second radial sliders 43 and a third bearing end cover 45. The second bearing housing 41 and the first bearing housing are arranged at an axial interval along the rotating shaft 1. The plurality of second radial sliders 43 are arranged at a circumferential interval between the second bearing housing 41 and the rotating shaft 1. The third bearing end cover 45 is located on the side of the second bearing housing 41 facing the first bearing housing and is detachably connected to the second bearing housing 41.

[0087] In this embodiment, the third bearing end cover 45 is detachably connected to the second bearing housing 41. After removing the third bearing end cover 45, the second radial slider 43 can be moved along the axial direction of the rotating shaft 1 to remove the second radial slider 43 from the shafting without removing the second bearing housing 41, simplifying the disassembly and assembly process of the second radial slider 43, thereby reducing the maintenance difficulty and operation and maintenance cost of the shafting.

[0088] In this embodiment, the shafting further includes a fourth bearing end cover 44. The fourth bearing end cover 44 and the third bearing end cover 45 are respectively arranged on the two axial sides of the second bearing housing 41 along the rotating shaft 1, and the fourth bearing end cover 44 and the third bearing end cover 45 are respectively connected to the ends of the second bearing housing 41, but it is not limited thereto. Further, the rotating shaft 1 further includes a shaft shoulder 12. The shaft shoulder 12 is arranged on the side of the second radial slider 43 facing away from the first bearing housing, and the shaft shoulder 12 and the second radial slider 43 are arranged at an axial interval to avoid friction between the shaft shoulder 12 and the second radial slider 43, but it is not limited thereto.

[0089] In this embodiment, the second bearing housing 41, the fourth bearing end cover 44, multiple second radial sliders 43, and the third bearing end cover 45 constitute the main structure of the second bearing assembly 4, but this is not limiting.

[0090] As needed, the shafting further includes a second slider support 42, which is disposed between the second bearing housing 41 and the second radial slider 43, but this is not limiting. In this embodiment, the second bearing assembly 4 further includes a second slider support 42.

[0091] To further simplify the disassembly and assembly process of the second radial slider 43 and improve the possibility of disassembling and assembling the second radial slider 43 on the tower, a third connection hole is provided on the second bearing housing 41. The third connection hole penetrates through the radial outer surface and the radial inner surface of the second bearing housing 41. A third fastener 46 passes through the third connection hole and is connected to the second radial slider 43 to fix the second radial slider 43 on the second bearing housing 41.

[0092] As an example, the radial inner end of the third fastener 46 is provided with an external thread, and the radial inner end of the third fastener 46 can be threadedly connected to the second radial slider 43, improving the connection reliability between the second radial slider 43 and the second bearing housing 41, but this is not limiting. Optionally, the third fastener 46 includes a bolt, or the third fastener 46 includes a bolt and a sleeve sleeved outside the bolt. By providing a sleeve outside the bolt, the shear resistance of the third fastener 46 can be improved, but this is not limiting.

[0093] As needed, the third connection hole can be a threaded hole or a smooth hole. In this embodiment, the third connection hole is taken as an example of a smooth hole for illustration, but this is not limiting.

[0094] To improve the disassembly and assembly efficiency of the third bearing end cover 45, the third bearing end cover 45 includes at least two second end cover segments (not shown in the figure). The at least two second end cover segments are connected end to end along the circumferential direction of the rotating shaft 1 to form a ring. Compared with the integral ring-shaped third bearing end cover 45, the second end cover segments provided in this embodiment are convenient for disassembly and assembly, and do not need to move a long distance along the axial direction of the rotating shaft 1, thereby reducing the disassembly and assembly difficulty of the third bearing end cover 45, but this is not limiting.

[0095] As an example, in this embodiment, a ring groove extending along the circumferential direction of the rotating shaft 1 is provided in the middle of the third bearing end cover 45, and a seal can be provided in the ring groove. With this setting, the outside of the third bearing end cover 45 provided with the seal is substantially flush, improving the aesthetics of the shafting.

[0096] On the other hand, the present disclosure provides a transmission chain, which includes a gearbox 3 and a shafting connected to the gearbox 3 as described above. The gearbox 3 is disposed at the first end of the rotating shaft 1. The gearbox 3 includes a box body and an input shaft disposed in the box body. The box body is fixedly connected to the first bearing seat, and the input shaft is fixedly connected to the rotating shaft 1.

[0097] As an example, the first bearing end cover 29 is connected to the box body of the gearbox 3 of the wind turbine generator set, and the first end of the rotating shaft 1 is fixed to the input shaft of the gearbox 3, but not limited thereto.

[0098] On the other hand, the present disclosure provides a wind turbine generator set, which includes the transmission chain as described above, and the rotating shaft 1 is the main shaft of the wind turbine generator set.

[0099] On the other hand, the present disclosure provides a maintenance method for a shafting, which includes:

[0100] Detach the second bearing end cover 24 from the outer cylinder 21 to expose the first radial slider 23;

[0101] Detach the first radial slider 23 from the outer cylinder 21;

[0102] Move the first radial slider 23 axially toward the side away from the gearbox 3 and detach it.

[0103] Specifically, the fastener between the second bearing end cover 24 and the outer cylinder 21 can be removed first; then the second fastener 28 between the outer cylinder 21 and the first radial slider 23 is removed, so that the first radial slider 23 can move relative to the outer cylinder 21; move the first radial slider 23 axially along the rotating shaft 1 to detach the first radial slider 23 from the shafting.

[0104] Furthermore, the shafting further includes a maintenance through hole opened on the outer cylinder 21, the shafting further includes a second axial bearing 27 disposed between the flange 11 and the first bearing end cover 29, the second axial bearing 27 can be taken out through the maintenance through hole, the shafting further includes a maintenance cover body 26 detachably installed on the maintenance through hole, and the maintenance method of the shafting further includes:

[0105] Detach the maintenance cover body 26 from the outer cylinder 21;

[0106] Rotate the rotating shaft 1 to align the second axial bearing 27 with the maintenance through hole;

[0107] Detach the second axial bearing 27 from the rotating shaft 1;

[0108] Take out the second axial bearing 27 from the maintenance through hole.

[0109] Specifically, first remove the fasteners between the maintenance cover 26 and the outer cylinder 21; at this time, the rotating shaft 1 can be rotated so that the second axial bearing 27 on the rotating shaft 1 can be aligned with the maintenance through-hole; remove the first fastener 30 between the second axial bearing 27 and the rotating shaft 1 so that the second axial bearing 27 can move freely relative to the rotating shaft 1, and then take out the second axial bearing 27 through the maintenance through-hole, so that the second axial bearing 27 can be disassembled from the shafting.

[0110] Further, the shafting further includes a second bearing seat 41, a plurality of second radial sliders 43 and a third bearing end cover 45. The second bearing seat 41 and the first bearing seat are arranged at intervals along the axial direction of the rotating shaft 1. The plurality of second radial sliders 43 are arranged at intervals along the circumferential direction of the rotating shaft 1 between the second bearing seat 41 and the rotating shaft 1. The third bearing end cover 45 is located on the side of the second bearing seat 41 facing the first bearing seat and is detachably connected to the second bearing seat 41. The maintenance method of the shafting further includes:

[0111] Remove the third bearing end cover 45 from the second bearing seat 41;

[0112] Remove the second radial slider 43 from the second bearing seat 41;

[0113] Move the second radial slider 43 axially toward the first bearing seat and disassemble it.

[0114] Specifically, the fasteners between the third bearing end cover 45 and the second bearing seat 41 can be removed first, and then the third fastener 46 between the second bearing seat 41 and the second radial slider 43 can be removed so that the second radial slider 43 can move freely relative to the second bearing seat 41, and then move the second radial slider 43 axially along the rotating shaft 1 so that the second radial slider 43 can be disassembled from the shafting, but not limited thereto.

[0115] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present disclosure.

[0116] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present disclosure, unless otherwise specified, the meaning of "a plurality" is two or more.

[0117] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0118] The features, structures, or characteristics described in the present disclosure may be combined in any suitable manner in one or more embodiments. In the above description, many specific details are provided to give a full understanding of the embodiments of the present disclosure. However, those skilled in the art will realize that the technical solutions of the present disclosure can be practiced without one or more of the specific details, or other methods, components, materials, etc. may be used. In other cases, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the present disclosure.

Claims

1. A shafting system for a wind turbine generator, characterized in that, The shafting system includes: A rotating shaft (1), with a flange (11) protruding outwardly and extending at the first end of the rotating shaft (1); A first bearing housing, which includes a first bearing end cover (29), a second bearing end cover (24), and an outer cylinder (21). The first bearing end cover (29) and the second bearing end cover (24) are respectively arranged on both sides of the flange (11). The first bearing end cover (29) is used for connecting to the housing of the gearbox (3) of the wind turbine generator set. The second bearing end cover (24) is detachably connected to the outer cylinder (21). The outer cylinder (21) extends axially along the rotating shaft (1) from the side of the first bearing end cover (29) towards the second bearing end cover (24), such that the outer cylinder (21) is located radially outside the flange (11); A first radial bearing, including a plurality of first radial sliders (23). The plurality of first radial sliders (23) are arranged at intervals in the circumferential direction between the radially outer side of the flange (11) and the outer cylinder (21), and the first radial sliders (23) are connected to the outer cylinder (21).

2. The shafting according to claim 1, characterized in that, The shafting system further includes a first axial bearing (25), which is arranged between the flange (11) and the second bearing end cover (24), and the first axial bearing (25) is connected to the second bearing end cover (24).

3. The shafting according to claim 1, characterized in that, The shafting system further includes a second axial bearing (27), which is arranged between the flange (11) and the first bearing end cover (29).

4. The shafting according to claim 3, characterized in that, The second axial bearing (27) is fixedly connected to the rotating shaft (1). Wherein, on the circumference radially corresponding to the second axial bearing (27), a maintenance through-hole is provided on the outer cylinder (21), and the second axial bearing (27) can be taken out through the maintenance through-hole. The shafting system further includes a maintenance cover body (26) detachably installed on the maintenance through-hole.

5. The shafting according to claim 4, characterized in that, The rotating shaft (1) has a hollow rotating shaft inner cavity. The rotating shaft (1) has a first connection hole, and a first fastener (30) passes through the first connection hole and is fixedly connected to the second axial bearing (27) to fix the second axial bearing (27) on the rotating shaft (1).

6. The shafting according to any one of claims 1 to 5, characterized in that, The outer cylinder (21) is provided with a second connection hole that penetrates the outer cylinder (21) and extends radially. A second fastener (28) passes through the second connection hole and is connected to the first radial slider (23) to fix the first radial slider (23) on the outer cylinder (21).

7. The shafting according to any one of claims 1 to 5, characterized in that, The shafting system further includes a second bearing housing (41), a plurality of second radial sliders (43), and a third bearing end cover (45). Among them, the second bearing housing (41) and the first bearing housing are arranged at intervals axially. The plurality of second radial sliders (43) are arranged at intervals in the circumferential direction of the rotating shaft (1) between the second bearing housing (41) and the rotating shaft (1). The third bearing end cover (45) is located on the side of the second bearing housing (41) facing the first bearing housing and is detachably connected to the second bearing housing (41).

8. The shafting according to claim 7, characterized in that, The second bearing housing (41) is provided with a third connection hole, and a third fastener (46) passes through the third connection hole to be connected to the second radial slider (43) so as to fix the second radial slider (43) on the second bearing housing (41).

9. The shafting according to any one of claims 1 to 5, characterized in that, The second bearing end cover (24) includes at least two first end cover segments (241), and at least two of the first end cover segments (241) are connected end to end along the circumferential direction of the rotating shaft (1) to form a ring shape; and / or, The shafting further includes a second bearing housing (41), a plurality of second radial sliders (43), and a third bearing end cover (45). Among them, the second bearing housing (41) is axially spaced from the first bearing housing, and the plurality of second radial sliders (43) are circumferentially spaced between the second bearing housing (41) and the rotating shaft (1). The third bearing end cover (45) is located on one side of the second bearing housing (41) facing the first bearing housing and is detachably connected to the second bearing housing (41). The third bearing end cover (45) includes at least two second end cover segments, and at least two of the second end cover segments are connected end to end along the circumferential direction of the rotating shaft (1) to form a ring shape.

10. A transmission chain, characterized in that, It includes a gearbox (3) and the shafting as described in any one of claims 1-9 connected to the gearbox (3). The gearbox (3) is arranged at the first end of the rotating shaft (1). The gearbox (3) includes a box body and an input shaft arranged in the box body. The box body is fixedly connected to the first bearing housing, and the input shaft is fixedly connected to the rotating shaft (1).

11. A wind power generating set, characterized in that, The wind turbine generator includes the transmission chain as described in claim 10, and the rotating shaft (1) is the main shaft of the wind turbine generator.

12. A maintenance method for a shafting system, characterized in that, The shafting is the shafting as described in claim 1, and the maintenance method of the shafting includes: Detach the second bearing end cover (24) from the outer cylinder body (21) to expose the first radial slider (23); Detach the first radial slider (23) from the outer cylinder body (21); Move the first radial slider (23) axially toward the side away from the gearbox (3) and detach it.

13. The maintenance method of the shafting according to claim 12, characterized in that, The shafting further includes a maintenance through hole opened on the outer cylinder body (21). The shafting further includes a second axial bearing (27) arranged between the flange (11) and the first bearing end cover (29). The second axial bearing (27) can be taken out through the maintenance through hole. The shafting further includes a maintenance cover body (26) detachably installed on the maintenance through hole. The maintenance method of the shafting further includes: Detach the maintenance cover body (26) from the outer cylinder body (21); Rotate the rotating shaft (1) so that the second axial bearing (27) is aligned with the maintenance through hole; Detach the second axial bearing (27) from the rotating shaft (1); Take out the second axial bearing (27) from the maintenance through hole.

14. The maintenance method of the shafting according to claim 12, characterized in that, The shafting further includes a second bearing housing (41), a plurality of second radial sliders (43), and a third bearing end cover (45). Among them, the second bearing housing (41) is axially spaced from the first bearing housing, and the plurality of second radial sliders (43) are circumferentially spaced between the second bearing housing (41) and the rotating shaft (1). The third bearing end cover (45) is located on the side of the second bearing housing (41) facing the first bearing housing and is detachably connected to the second bearing housing (41). The maintenance method of the shafting further includes: Detaching the third bearing end cover (45) from the second bearing housing (41); Detaching the second radial sliders (43) from the second bearing housing (41); Axially moving the second radial sliders (43) towards the first bearing housing and detaching them.

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