Sliding bearing system and maintenance method thereof

Abstract

The invention relates to the technical field of wind turbines, and particularly provides a sliding bearing system and a maintenance method thereof.The sliding bearing system comprises a pair of radial sliding bearings located at the hub end and the gearbox end of a main shaft respectively, and the main shaft is rotatably connected to a cabin through the pair of radial sliding bearings; the axial sliding bearing is located on the opposite outer side of the gear box end of the main shaft, and the axial sliding bearing is connected with the cabin and the main shaft; the axial sliding bearing includes an annular plate detachably connected to the gearbox end of the main shaft and a number of caliper slider modules arranged spaced apart from each other along a circumferential direction of the annular plate and detachably connected to the nacelle and each releasably clamping the annular plate. Through the configuration, the caliper type sliding block module can loosen and clamp the annular plate, so that the caliper type sliding block module can be loosened and further pulled out from the annular plate, and the axial sliding bearing with the replaceable sliding blocks on the two sides is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind turbine technology, in particular to a sliding bearing system and a maintenance method thereof. BACKGROUND

[0002] In recent years, under the background of the rapid increase in global clean energy demand, the wind power industry, as the core pillar of the renewable energy field, is experiencing a leapfrog development. Industry data shows that the global installed capacity of wind power and annual power generation are showing an exponential growth trend. In order to continuously optimize the economy and market competitiveness of wind power projects, the whole industry chain is focusing on the unit degree cost control strategy, which directly catalyzes the technological innovation of large-scale wind turbine generators. By improving the power density of single machine, the number of generators can be effectively reduced under the same installed capacity, thereby significantly reducing the investment in infrastructure construction and the operating cost throughout the life cycle.

[0003] However, technical bottlenecks gradually appear in the process of large-scale wind turbine generator, especially in the field of core transmission components. As the center of energy transmission, the main shaft system presents a nonlinear growth in geometric size, overall mass and manufacturing cost. When the diameter of the supporting rolling bearing of the wind turbine main shaft breaks through the threshold of 6m, the material consumption, machining precision requirement and assembly difficulty present a geometric progression. In view of the technical limitations of rolling bearings in super large power units, the industry technology roadmap begins to tilt towards the sliding bearing solution. Compared with traditional rolling bearings, sliding bearings are becoming the key technical breakthrough direction of the new generation of large megawatt wind turbines due to their excellent load distribution characteristics, excellent impact load bearing capacity and better power density. However, the industrial application of this technical route still needs to overcome many engineering problems.

[0004] In the existing sliding bearing system of the current wind power transmission chain, the radial bearing bushing is deformed unevenly due to the bending moment, which has a great influence on the oil film formation in the sliding bearing, thereby greatly shortening the service life of the sliding bearing. At the same time, the radial bearing bushing and the thrust bearing bushing are placed together in the hub end, and due to the limitation of the basic functions and structure of the wind turbine, the bearing lubrication, maintenance and disassembly and replacement are difficult to achieve. SUMMARY

[0005] The present application provides a sliding bearing system and a maintenance method thereof, which solves the defect that the radial / axial bearing of the sliding bearing is difficult to replace in the prior art, and realizes a sliding bearing system suitable for low-speed high-load working conditions of a wind turbine generator and facilitating replacement of radial / axial bearing or its constituent parts.

[0006] According to a first aspect of the present application, the present application provides a sliding bearing system applied to a low-speed main shaft of a wind turbine generator, the wind turbine generator comprising a nacelle and a main shaft, the main shaft further comprising a hub end and a gear box end, the main shaft being arranged on the nacelle, the sliding bearing system comprising: a pair of radial sliding bearings, including a first radial sliding bearing and a second radial sliding bearing, respectively located at a hub end and a gearbox end of the main shaft, the main shaft being rotatably connected to the nacelle through the pair of radial sliding bearings; an axial sliding bearing located at the gearbox end of the main shaft and on an opposite outer side of the second radial sliding bearing, the axial sliding bearing connecting the nacelle and the main shaft; wherein the axial sliding bearing includes a ring-shaped plate and a plurality of caliper slider modules, the ring-shaped plate being detachably connected to the gearbox end of the main shaft, the plurality of caliper slider modules being arranged at intervals along a circumferential direction of the ring-shaped plate and detachably connected to the nacelle, and each being releasably clamped to the ring-shaped plate.

[0007] According to the sliding bearing system provided in the present application, each caliper slider module includes two L-shaped members, each L-shaped member including an axial plate portion and a radial plate portion, each radial plate portion being parallel to the ring-shaped plate, a plurality of sliders being arranged between each radial plate portion and the ring-shaped plate, and the two L-shaped members being connected together at end portions of the respective axial plate portions.

[0008] According to the sliding bearing system provided in the present application, the ring-shaped plate is in clearance fit with the sliders close to the hub end, and in transition fit or interference fit with the sliders close to the gearbox end.

[0009] According to the sliding bearing system provided in the present application, along the circumferential direction of the ring-shaped plate, the plurality of sliders slide relative to the ring-shaped plate; or the plurality of sliders rotate together with the ring-shaped plate and slide relative to the caliper slider modules.

[0010] According to the sliding bearing system provided in the present application, each caliper slider module further includes an axial adjusting device to adjust an axial distance of the sliders close to the gearbox end.

[0011] According to the sliding bearing system provided in the present application, further including an axial sliding bearing seat detachably connected to the nacelle; the axial sliding bearing seat is provided with a plurality of maintenance windows, when any caliper slider module is detached or released, the caliper slider module or the sliders are removed from any one of the plurality of maintenance windows away from the axial sliding bearing seat.

[0012] According to the sliding bearing system provided in the present application, the ring-shaped plate is integrally formed or combined by a plurality of arc-shaped segments.

[0013] According to the sliding bearing system provided in the present application, each radial sliding bearing includes a plurality of arc-shaped slider modules, each arc-shaped slider module being a tiltable pad, and each arc-shaped slider module being insertable / extractable from an opposite outer side at the hub end or the gearbox end.

[0014] According to the second aspect of the present application, the present application also provides a sliding bearing system maintenance method, which is applied to the sliding bearing system according to the first aspect of the present application, and at least includes the following steps: determining a maintenance window for aligning the caliper-type slider module to be replaced, or rotating the main shaft so that the slider to be replaced is aligned with the maintenance window; opening the maintenance window to access the caliper-type slider module to be replaced or the slider to be replaced; disconnecting the caliper-type slider module from the nacelle, or adjusting the axial adjustment device of the caliper-type slider module to be replaced so that the slider to be replaced is loosened from the annular plate; radially pulling out the caliper-type slider module to be replaced, or axially pulling out the L-shaped member to be replaced or the slider to be replaced.

[0015] According to the sliding bearing system maintenance method provided by the present application, when there is an arc-shaped slider module to be replaced in the first radial sliding bearing or the second radial sliding bearing, at least the following steps are included: dismantling the end cover of the hub end or the axial sliding bearing; axially pulling out the first arc-shaped slider module to be replaced or its radial slider.

[0016] The sliding bearing system provided by the present application, through the configuration of the caliper-type slider module, integrates the sliders on both sides of the axial sliding bearing (i.e., close to the hub end and close to the gearbox end, bounded by the annular plate) in the caliper-type slider module, in particular, the caliper-type slider module can loosely clamp the annular plate, thereby the caliper-type slider module can be loosened and further pulled out from the annular plate, so as to realize the axial sliding bearing with replaceable sliders on both sides. In addition, the sliding bearing system provided by the present application, through the configuration of the radial sliding bearing arranged at both ends (i.e., the hub end and the gearbox end) of the nacelle / main shaft, thereby realizes the maintenance step of pulling out the arc-shaped slider module from the opposite outer side at the hub end or the gearbox end, in particular, when the second radial sliding bearing at the gearbox end has an arc-shaped slider module to be replaced, first dismounting the axial sliding bearing to expose each arc-shaped slider module, and then performing the maintenance step of the arc-shaped slider module to be replaced. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0018] Figure 1 is a perspective view of the sliding bearing system provided by the present application applied to the low-speed main shaft of a wind turbine.

[0019] Figure 2 yes Figure 1 A cross-sectional view of a sliding bearing system is shown.

[0020] Figure 3 It is a cross-sectional view of the axial sliding bearing provided by this application.

[0021] Figure 4 It is an axial cross-sectional view of the axial sliding bearing and the second radial sliding bearing provided by the present application.

[0022] Figure 5 It is a three-dimensional diagram of the axial sliding bearing seat provided in this application.

[0023] Reference numerals: 1. Nacelle; 2. Main shaft; H. Hub end; G. Gearbox end; 3. First radial sliding bearing; 4. Second radial sliding bearing; 5. Axial sliding bearing; 6. Annular plate; 7. Caliper-type slider module; 8. L-shaped member; 8-1. Axial plate portion; 8-2. Radial plate portion; 9. Slider; 10. Axial sliding bearing seat; 11. Inspection window; 12. Arc-shaped slider module. DETAILED DESCRIPTION

[0024] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] In the description of the embodiments of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed or detachable connections, where fixed connections can include integral connections; they can refer to mechanical or electrical connections; and they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0027] In the embodiments of the present application, unless specifically defined and limited otherwise, a first feature is "on", "above", or "below" a second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact with an intervening medium. Also, the first feature "above", "over", and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature "below", "under", and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0028] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0029] The following will be described in combination with Figures 1 to 5 The sliding bearing system for the low-speed main shaft of a wind turbine is described in the present application.

[0030] As Figures 1-2 shown, Figure 1 is a perspective view of the sliding bearing system applied to the low-speed main shaft of a wind turbine provided by the present application, Figure 2 is a cross-sectional view of the sliding bearing system as shown, Figure 1 The wind turbine includes a nacelle 1 and a main shaft 2, the main shaft 2 further includes a hub end H and a gearbox end G, and the main shaft 2 is arranged on the nacelle 1 in a penetrating manner.

[0031] The sliding bearing system includes a pair of radial sliding bearings, i.e. a first radial sliding bearing 3 and a second radial sliding bearing 4, and an axial sliding bearing 5. Among them, the first radial sliding bearing 3 and the second radial sliding bearing 4 are respectively located at the hub end H and the gearbox end G of the main shaft 2, and the main shaft 2 is rotatably connected to the nacelle 1 through the pair of radial sliding bearings. The axial sliding bearing 5 is located at the gearbox end G of the main shaft 2 and is located on the opposite outer side of the second radial sliding bearing 4. It can be imagined that for the second radial sliding bearing 4, the side close to the gearbox is its opposite outer side. Similar to the pair of radial sliding bearings, the axial sliding bearing 5 rotatably connects the nacelle 1 and the main shaft 2.

[0032] AsFigure 3 and 5 as shown in the drawings, Figure 3 is a sectional view of the axial sliding bearing provided by the present application, Figure 5 is a perspective view of the axial sliding bearing seat provided by the present application. The axial sliding bearing 5 comprises a ring-shaped plate 6 and a plurality of caliper slider modules 7. The ring-shaped plate 6 can be a single-piece integrally formed, or alternatively, can be composed of a plurality of arc-shaped segments connected end-to-end in the circumferential direction. The ring-shaped plate 6 is detachably connected to the gear box end G of the main shaft 2, and in particular, the ring-shaped plate 6 is fixedly connected to the main shaft 2. The plurality of caliper slider modules 7 are arranged at intervals in the circumferential direction of the ring-shaped plate 6, and each caliper slider module 7 is releasably clamped to the ring-shaped plate 6. This means that when the maintenance personnel operate the caliper slider module 7 to release it, the caliper slider module 7 can be pulled out of the ring-shaped plate 6.

[0033] Each caliper slider module 7 comprises two L-shaped members 8. Each L-shaped member 8 comprises an axial plate portion 8-1 and a radial plate portion 8-2, and the L-shaped member 8 can be integrally formed, or alternatively, the axial plate portion 8-1 and the radial plate portion 8-2 are fixedly connected to each other at a right angle. The two L-shaped members 8 are movably connected together at the end of the respective axial plate portion 8-1. The respective radial plate portions 8-2 of the two L-shaped members 8 are parallel to each other and to the ring-shaped plate 6. A plurality of sliders 9 are arranged between the radial plate portion 8-2 close to the hub end H and the ring-shaped plate 6, and a plurality of sliders 9 are also arranged between the radial plate portion 8-2 close to the gear box end G and the ring-shaped plate 6, and the sliders 9 can be formed in the shape of a sector, a circle or other suitable shape. The relationship between the sliders 9 and the bidirectional axial force transmission of the main shaft 2 will be described in detail below.

[0034] The sliders 9 can be connected to the caliper slider module 7 as described above, so that the sliders 9 only undergo axial displacement relative to the axial plate portion 8-1 of the L-shaped member 8, and do not undergo relative movement in the circumferential direction of the main shaft 2 / ring-shaped plate 6. In another embodiment, the sliders 9 can rotate with the ring-shaped plate 6 through a bracket (not shown in the drawings), in other words, the sliders 9 undergo relative movement in the circumferential direction of the main shaft 2 relative to the axial plate portion 8-1 of the L-shaped member 8. Moreover, the sliders 9 close to the hub end H are in clearance fit with the ring-shaped plate 6 in the axial direction; and the sliders 9 close to the gear box end G are in transition fit or interference fit with the ring-shaped plate 6 in the axial direction.

[0035] Each caliper slider module 7 further comprises an axial adjustment device to adjust the axial distance of the slider 9 close to the gearbox end G. Specifically, the axial adjustment device comprises a number of threaded holes (not shown in the figures) along the axial direction through the axial plate portion 8-1 of the L-shaped member 8 close to the gearbox end G, each threaded hole being threaded with a corresponding adjustment bolt. The adjustment bolts are threadedly engaged with the threaded holes of the axial plate portion 8-1, whereby rotation of the adjustment bolts translates into axial displacement of the slider 9 close to the gearbox end G, which in turn causes the slider 9 close to the gearbox end G to abut against the annular plate 6, thereby achieving a change in the axial distance of the annular plate 6 relative to the caliper slider module 7, and finally enabling clamping / unclamping of the annular plate 6. Of course, other forms of axial adjustment devices are possible in other embodiments.

[0036] Returning to Figure 2 and with reference to Figure 5 , the sliding bearing system further comprises an axial sliding bearing housing 10, which is detachably connected to the nacelle 1. The axial sliding bearing 5 is housed in the axial sliding bearing housing 10 and is as described above sheathed on the main shaft 2. The axial sliding bearing housing 10 is provided with a number of access windows 11, each of which is aligned with one or more of any of the caliper slider modules 7. Alternatively, in embodiments where the slider 9 rotates with the annular plate 6, the slider 9 can be rotated to face a designated access window 11, upon which the maintenance personnel can access the caliper slider module 7 or the slider 9 by opening the access window 11. When any of the caliper slider modules 7 is detached by the maintenance personnel or loosened by operation of the axial adjustment device, the maintenance personnel can then pull out the caliper slider module 7 radially or the slider 9 axially through the designated access window 11 of the axial sliding bearing housing 10.

[0037] When the main shaft 2 is subjected to an axial force towards the gearbox end G, the axial force is transmitted through the following path - main shaft 2 → annular plate 6 → slider 9 (between the radial plate portion 8-2 close to the gearbox end G and the annular plate 6) → radial plate portion 8-2 → axial plate portion 8-1 → nacelle 1, and finally to the nacelle 1 or even the tower (not shown in the figures), so that the axial force is absorbed and dissipated. As shown in Figure 4 , Figure 4 is an axial sectional view of the axial sliding bearing and the second radial sliding bearing provided in the present application, when the main shaft 2 is subjected to an axial force towards the hub end H, the axial force is transmitted through the following path - main shaft 2 → annular plate 6 → slider 9 (between the radial plate portion 8-2 close to the hub end H and the annular plate 6) → radial plate portion 8-2 → end face of the second radial bearing surface or nacelle 1 → nacelle 1, and similarly, the axial force is finally dissipated.

[0038] Each radial sliding bearing comprises several arc-shaped slider modules 12, each arc-shaped slider module 12 acting as a tiltable shoe. Each arc-shaped slider module 12 is insertable / extractable from the opposite outer side at the hub end H or the gearbox end G. For the first radial sliding bearing 3 at the hub end H, the opposite outer side means the side close to the hub end H; and for the second radial sliding bearing 4 at the gearbox end G, the opposite outer side means the side close to the gearbox end G. When an arc-shaped slider module 12 of the first radial sliding bearing 3 or the second radial sliding bearing 4 is to be replaced, a maintenance worker can temporarily expand the radial distance between the nacelle 1 and the main shaft 2 near the arc-shaped slider module 12 to be replaced by using a special tool, such as a jack, so that the nacelle 1 and the main shaft 2 do not tightly clamp the arc-shaped slider module 12 for a short time, so that the maintenance worker can extract it and immediately insert a replacement arc-shaped slider module 12. Even, the maintenance worker does not have to extract the entire arc-shaped slider module 12 to be replaced, but only the radial sliders (not shown in the figure) in the arc-shaped slider module 12.

[0039] The application also provides a sliding bearing system maintenance method applied to the sliding bearing system as described above, which at least comprises the following steps: S1 - determining an inspection window 11 aligned with the caliper shoe module 7 to be replaced, or rotating the main shaft 2 so that the shoe 9 to be replaced is aligned with the inspection window 11.

[0040] The axial sliding bearing seat 10 is provided with several inspection windows 11, each inspection window 11 being aligned with one or more caliper shoe modules 7. Alternatively, in the embodiment in which the shoes 9 rotate with the annular plate 6, the drive system of the wind turbine can be started to rotate the main shaft 2, the annular plate 6 and the shoes 9 until the shoe 9 to be replaced is rotated to align with the designated inspection window 11.

[0041] S2 - opening the inspection window 11 to access the caliper shoe module 7 to be replaced or the shoe 9 to be replaced.

[0042] When the caliper shoe module 7 to be replaced or the shoe 9 to be replaced is rotated to align with the designated inspection window 11, the maintenance worker opens the inspection window 11 to access the caliper shoe module 7 to be replaced or the shoe 9 to be replaced, and can further operate the caliper shoe module 7 to be replaced.

[0043] S3 - disconnecting the connection of the caliper shoe module 7 to the nacelle 1, or adjusting the axial adjustment device of the caliper shoe module 7 to be replaced so that the shoe 9 to be replaced is loosened from the annular plate 6.

[0044] As mentioned above, the caliper slider module 7 also comprises axial adjustment means. In particular, a maintenance worker can operate the adjustment bolt such that the slider 9 to be replaced, which is close to the gear box end G, moves axially towards the gear box end G, thereby loosening the slider 9 from the ring plate 6.

[0045] S4 - Radially pulling out the caliper slider module 7 to be replaced, or alternatively, axially pulling out the L-shaped member 8 to be replaced or the slider 9 to be replaced.

[0046] When the caliper slider module 7 is loosened from the ring plate 6, a maintenance worker pulls out the caliper slider module 7 to be replaced along the radial direction (of the main shaft 2) through the inspection window 11. Further, the maintenance worker places a new replacement caliper slider module 7 onto the ring plate 6 from the original path through the inspection window 11. Then, the axial adjustment means of the new replacement caliper slider module 7 is operated to clamp the ring plate 6. In this way, the replacement step of the caliper slider module 7 to be replaced is completed. Alternatively, the connection of the two L-shaped members 8 of the caliper slider module 7 is loosened, such that the L-shaped member 8 close to the gear box end G becomes a free member, at this time, the maintenance worker can axially pull out the L-shaped member 8. Alternatively, when the slider 9 to be replaced is loosened from the ring plate 6, whether the slider 9 rotates with the ring plate 6 or not, at this time, the slider 9 to be replaced can be pulled out along the axial direction (of the main shaft 2).

[0047] Even in some cases, for example, in the case that the entire caliper slider module 7 does not need to be replaced, the connection of the two axial plate portions 8-1 can be disconnected, then the L-shaped member 8 close to the gear box end G is pulled out along the axial direction, and a new replacement L-shaped member 8 is placed back from the original path.

[0048] Further, when the first radial sliding bearing 3 or the second radial sliding bearing 4 has an arc-shaped slider module 12 to be replaced, the sliding bearing system maintenance method further comprises the following steps: S5 - Disassembling the end cover of the hub end H or the axial sliding bearing 5.

[0049] In the running state, the first radial sliding bearing 3 is blocked by the end cover of the hub end H, and the second radial sliding bearing 4 is blocked by the axial sliding bearing 5. When the first radial sliding bearing 3 or the second radial sliding bearing 4 has an arc-shaped slider module 12 to be replaced, in order to expose the first radial sliding bearing 3 or the second radial sliding bearing 4, it is necessary to disassemble the end cover of the hub end H or the axial sliding bearing 5. Of course, before disassembling the axial sliding bearing 5, the axial sliding bearing seat 10 needs to be disassembled in advance.

[0050] S6 - Axially pulling out the first arc-shaped slider module 12 to be replaced or its radial slider.

[0051] The maintenance personnel temporarily expand the radial distance between the nacelle 1 and the main shaft 2 near the first arc-shaped slider module 12 to be replaced by using a special tool, such as a jack, so that the nacelle 1 and the main shaft 2 do not tightly clamp the first arc-shaped slider module 12 to be replaced in a short time, so that the maintenance personnel can pull it out in the axial direction, and then insert a new replacement arc-shaped slider module 12. In this way, the replacement step of the first arc-shaped slider module 12 to be replaced is completed. Alternatively, when the radial distance between the nacelle 1 and the main shaft 2 near the first arc-shaped slider module 12 to be replaced is temporarily expanded, the maintenance personnel can replace only the radial slider in the first arc-shaped slider module 12 to be replaced according to actual needs.

[0052] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A sliding bearing system, applied to a low-speed main shaft of a wind turbine, the wind turbine comprising a nacelle (1) and a main shaft (2), the main shaft (2) further comprising a hub end (H) and a gearbox end (G), the main shaft (2) passing through the nacelle (1) and arranged thereon, characterized in that: The sliding bearing system comprises: a pair of radial sliding bearings (3, 4), comprising a first radial sliding bearing (3) and a second radial sliding bearing (4), respectively located at the hub end (H) and the gearbox end (G) of the main shaft (2), the main shaft (2) being rotatably connected to the nacelle (1) via the pair of radial sliding bearings (3, 4); an axial sliding bearing (5) located at the gearbox end (G) of the main shaft (2) and located on the relatively outer side of the second radial sliding bearing (4), the axial sliding bearing (5) connecting the nacelle (1) and the main shaft (2); The axial sliding bearing (5) includes an annular plate (6) and a plurality of caliper-type slider modules (7), wherein the annular plate (6) is detachably connected to the gearbox end (G) of the main shaft (2), and the plurality of caliper-type slider modules (7) are arranged spaced apart from each other along the circumference of the annular plate (6) and are detachably connected to the nacelle (1), and each of the caliper-type slider modules (7) can releasably clamp the annular plate (6).

2. The sliding bearing system according to claim 1, characterized in that Each of the caliper-type slider modules (7) includes two L-shaped members (8), each of the L-shaped members (8) includes an axial plate portion (8-1) and a radial plate portion (8-2), each of the radial plate portions (8-2) and the annular plate (6) are parallel to each other, a plurality of sliders (9) are provided between each of the radial plate portions (8-2) and the annular plate (6), and the two L-shaped members (8) are connected together at the ends of their respective axial plate portions (8-1).

3. The sliding bearing system according to claim 2, characterized in that The annular plate (6) has a clearance fit with the slider (9) near the hub end (H), and has a transition fit or an interference fit with the slider (9) near the gear box end (G).

4. The sliding bearing system according to claim 3, characterized in that Along the circumference of the annular plate (6), a plurality of the sliders (9) slide relative to the annular plate (6); or The plurality of sliders (9) rotate together with the annular plate (6) and slide relative to the caliper-type slider module (7).

5. The sliding bearing system according to claim 4, characterized in that Each of the caliper-type slider modules (7) further comprises an axial adjustment device for adjusting the axial distance of the slider (9) close to the gearbox end (G).

6. The sliding bearing system according to claim 3, characterized in that It also includes an axial sliding bearing seat (10), which is detachably connected to the cabin (1); the axial sliding bearing seat (10) is provided with a plurality of inspection windows (11), and when any of the caliper-type slider modules (7) is disassembled or loosened, the caliper-type slider module (7) or the slider (9) moves away from the axial sliding bearing seat (10) from any one of the plurality of inspection windows (11).

7. The sliding bearing system according to claim 1, characterized in that The annular plate (6) is integrally formed or is composed of a plurality of arc-shaped sections.

8. The sliding bearing system according to claim 1, characterized in that Each of the radial sliding bearings comprises a plurality of arc-shaped slider modules (12), each of the arc-shaped slider modules (12) being a tiltable pad, and each of the arc-shaped slider modules (12) being insertable / extractable from the relative outside at the hub end (H) or the gearbox end (G).

9. A method for maintaining a sliding bearing system, applied to the sliding bearing system according to any one of claims 1 to 8, characterized in that: At least the following steps are included: Determine that the inspection window (11) of the caliper-type slider module (7) to be replaced is aligned, or rotate the main shaft (2) so that the slider (9) to be replaced is aligned with the inspection window (11); Opening the inspection window (11) to allow access to the caliper slider module (7) or the slider (9) to be replaced; Disconnecting the connection between the caliper-type slider module (7) and the nacelle (1), or adjusting the axial adjustment device of the caliper-type slider module (7) to be replaced so that the slider (9) to be replaced is released from the annular plate (6); The caliper-type slider module (7) to be replaced is pulled out radially, or the L-shaped member (8) to be replaced or the slider (9) to be replaced is pulled out axially.

10. The sliding bearing system maintenance method according to claim 9, characterized in that: When a first radial sliding bearing (3) or a second radial sliding bearing (4) has an arc-shaped sliding block module (12) to be replaced, the method includes at least the following steps: Remove the end cover or axial plain bearing (5) at the hub end (H); Pull out the arc-shaped slider module (12) or its radial slider to be replaced axially.

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