Maintenance method for sliding bearing of shaft system, shaft system and wind generating set

Abstract

The invention provides a maintenance method for a sliding bearing of a shaft system, the shaft system and a wind generating set. The shaft system comprises a bearing seat, a rotating shaft located in the bearing seat and a plurality of bearing bush assemblies located between the rotating shaft and the bearing seat, and the multiple bearing bush assemblies are arranged in the circumferential direction of the bearing seat at intervals, fixedly connected with the bearing seat and capable of rotating relative to the rotating shaft. The maintenance method of the sliding bearing comprises the steps that each of the multiple bearing bush assemblies is fixedly connected with the rotating shaft, the connection between each of the multiple bearing bush assemblies and the bearing pedestal is removed, the rotating shaft is rotated by a preset angle relative to the bearing pedestal, the first bearing bush assembly located at the first position in the multiple bearing bush assemblies is moved away from the first position, and the second bearing bush assembly located at the second position in the multiple bearing bush assemblies is moved away from the second position. And the second bearing bush assembly in the multiple bearing bush assemblies is moved to the first position, each bearing bush assembly in the multiple bearing bush assemblies is fixedly connected with the bearing pedestal, and connection between the bearing bush assemblies and the rotating shaft is removed. Therefore, the maintenance steps are simple and the maintenance cost is low.

Description

Technical Field

[0001] This application relates to the technical field of bearing maintenance, and more specifically, to a maintenance method for a sliding bearing of a shafting, a shafting, and a wind turbine generator set. Background Art

[0002] The main bearing of a wind turbine is a relatively critical component in the wind turbine, and it needs to support the mechanical rotating body (including the impeller). Most main bearings adopt sliding bearings, and the sliding bearings need to bear most of the loads on the impeller. Therefore, the bearing bushes of the sliding bearings are prone to fatigue wear or even failure. With the development trend of wind turbine generator sets towards large-scale, this situation is becoming more and more significant. Maintaining the bearing bushes of the sliding bearings can not only extend the operation life of the wind turbine, but also reduce the downtime and maintenance costs, ensuring the stability and economic benefits of wind power generation. Therefore, it is particularly important to regularly maintain the bearing bushes of the sliding bearings.

[0003] In the prior art, we usually complete the regular maintenance of the sliding bearing by replacing the bearing bush or the sliding bearing as a whole, and this maintenance method is relatively complex and uneconomical to operate. Summary of the Invention

[0004] Therefore, the purpose of this application is to provide a maintenance method for a sliding bearing of a shafting, a shafting, and a wind turbine generator set to solve the problem that the maintenance operation of the sliding bearing is relatively complex and uneconomical.

[0005] According to the first aspect of this application, a maintenance method for a sliding bearing of a shafting is provided. The shafting includes a bearing housing, a rotating shaft located in the bearing housing, and a plurality of bearing bush assemblies located between the rotating shaft and the bearing housing. The plurality of bearing bush assemblies are spaced apart in the circumferential direction of the bearing housing, are respectively fixedly connected to the bearing housing, and can rotate relative to the rotating shaft. The maintenance method is characterized in that it includes: fixedly connecting each of the plurality of bearing bush assemblies to the rotating shaft, and removing the connection between each of the plurality of bearing bush assemblies and the bearing housing; rotating the rotating shaft relative to the bearing housing by a predetermined angle, so that the first bearing bush assembly located at the first position among the plurality of bearing bush assemblies moves away from the first position, and the second bearing bush assembly among the plurality of bearing bush assemblies moves to the first position; fixedly connecting each of the plurality of bearing bush assemblies to the bearing housing; and removing the connection between the bearing bush assembly and the rotating shaft.

[0006] According to the maintenance method of the sliding bearing for the shafting provided by the embodiments of the present application, each bearing bush assembly originally fixedly connected to the bearing housing is temporarily connected to the rotating shaft, and then the connection between the bearing housing and each bearing bush assembly is removed. Next, the rotating shaft is rotated to drive the bearing bush assembly to move to a predetermined position. In this way, the positions of each bearing bush assembly are interchanged in the circumferential direction of the bearing housing, and each bearing bush assembly is fixed to the bearing housing at the moved position. Finally, the connection between the bearing bush assembly and the rotating shaft is removed. In this way, during regular maintenance, the bearing bush assemblies on the sliding bearing are regularly rotated to avoid excessive wear of any single bearing bush during the entire operation cycle. The sliding bearing is maintained in this way, and the maintenance method is simple, and it can reduce maintenance time and cost. At the same time, it can also extend the service life of the sliding bearing.

[0007] In some embodiments, the bearing bush assembly includes a bearing bush connection seat, a bearing bush, and an elastic pad connected between the bearing bush connection seat and the bearing bush. The bearing bush connection seat is used for fixedly connecting to the bearing housing, and the bearing bush is in sliding contact with the rotating shaft. Fixing each of the plurality of bearing bush assemblies to the rotating shaft includes: fixedly connecting the bearing bush connection seat to the rotating shaft.

[0008] In these embodiments, during the maintenance process, the bearing bush connection seat is connected to the rotating shaft to realize fixing each of the plurality of bearing bush assemblies to the rotating shaft. In addition, the bearing bush assembly is integrally connected to the rotating shaft through the bearing bush connection seat. Since the bearing bush itself does not directly bear the force of the fixing bolt, this reduces the risk of damage to the bearing bush during the installation and disassembly process, thereby avoiding damaging the bearing bush and affecting its performance. In addition, if it is necessary to replace the bearing bush assembly, only the bearing bush can be replaced without removing the entire sliding bearing, so that the maintenance operation can be carried out more quickly.

[0009] In some embodiments, the bearing bush connection seat is fixedly connected to the rotating shaft by using a connecting plate. The connecting plate is L-shaped. Fixing each of the plurality of bearing bush assemblies to the rotating shaft includes: at one axial end of the bearing bush assembly, detachably connecting the two ends of the connecting plate to the bearing bush connection seat and the rotating shaft respectively.

[0010] In this embodiment, the L-shaped connecting plate can provide good mechanical properties. One end of the connecting plate is connected to the bearing bush connection seat, and the other end is connected to the rotating shaft, so that the distribution of force and weight is more uniform. In addition, the two ends of the connecting plate are respectively detachably connected to the bearing bush connection seat and the rotating shaft. In this way, it can be ensured that the bearing bush assembly and the rotating shaft are easy to separate after the maintenance is completed, so that the bearing bush assembly can be smoothly disassembled from the rotating shaft and refixed to the bearing housing.

[0011] In some embodiments, in the step of rotating the rotating shaft relative to the bearing housing by a predetermined angle, lubricating oil is applied between the bearing bush assembly and the bearing housing.

[0012] In these embodiments, applying lubricating oil between the bearing bush assembly and the bearing housing before rotating the rotating shaft relative to the bearing housing by a predetermined angle can ensure good lubrication of the interface area between the bearing housing and the bearing bush assembly during rotation, thereby reducing the impact on the overall performance of the sliding bearing.

[0013] In some embodiments, the sliding bearing is the main bearing of a wind turbine generator set, and the maintenance method further includes: locking the impeller of the wind turbine generator set before the step of fixedly connecting each of the plurality of bearing bush assemblies to the rotating shaft; unlocking the impeller after the step of removing the connection between each of the plurality of bearing bush assemblies and the bearing housing.

[0014] In these embodiments, locking the impeller of the wind turbine generator set before the step of fixedly connecting each of the plurality of bearing bush assemblies to the rotating shaft can effectively prevent the wind turbine generator set from accidentally starting or rotating during maintenance. Thus, it helps to improve the safety of maintenance operations and can protect the safety of maintenance personnel. Unlocking the impeller after the step of removing the connection between each of the plurality of bearing bush assemblies and the bearing housing can ensure the normal rotation of the rotating shaft to drive the positions of the respective bearing bush assemblies to the designated positions after maintenance.

[0015] In some embodiments, in the step of rotating the rotating shaft relative to the bearing housing by a predetermined angle, the turning gear system of the wind turbine generator set is used to rotate the rotating shaft.

[0016] In these embodiments, realizing the rotation of the rotating shaft relative to the bearing housing by a predetermined angle through the turning gear system can effectively ensure the feasibility of maintenance operations, improve operation efficiency and convenience, and is beneficial to ensuring the normal operation and maintenance of the sliding bearing.

[0017] Specifically, the first position is located below the rotating shaft.

[0018] Specifically, the predetermined angle is greater than 45 degrees and less than 315 degrees.

[0019] Specifically, the first bearing bush assembly is at least two bearing bush assemblies located below the rotating shaft.

[0020] According to a second aspect of the present application, a shafting system is provided, wherein the shafting system includes a bearing housing, a rotating shaft located in the bearing housing, and a plurality of bearing bush assemblies located between the rotating shaft and the bearing housing. The plurality of bearing bush assemblies are spaced apart in the circumferential direction of the bearing housing and are fixedly connected to the bearing housing respectively. Each of the plurality of bearing bush assemblies is provided with a first hole, and a plurality of second holes corresponding to the first holes are spaced apart in the circumferential direction of the rotating shaft, so that when applying the maintenance method of the sliding bearing for the shafting system described above, each of the plurality of bearing bush assemblies is fixedly connected to the rotating shaft through the first hole and the second hole.

[0021] According to the shafting system provided by the embodiments of the present application, each of the plurality of bearing bush assemblies is provided with a first hole, and a plurality of spaced second holes are provided on the rotating shaft. During maintenance, each bearing bush assembly originally fixedly connected to the bearing housing can be temporarily connected to the rotating shaft, and then the connection between the bearing housing and each bearing bush assembly is removed. Then, the rotating shaft is rotated to drive the bearing bush assembly to move to a predetermined position. In this way, the positions of each bearing bush assembly are interchanged in the circumferential direction of the bearing housing, and each bearing bush assembly is fixed to the bearing housing at the moved position. Finally, the connection between the bearing bush assembly and the rotating shaft is removed. In this way, during regular maintenance, the various bearing bush assemblies on the sliding bearing are regularly rotated to avoid excessive wear of any single bearing bush during the entire operation cycle. The sliding bearing is maintained in this way, and the maintenance method is simple, and it can reduce maintenance time and cost. At the same time, it can also extend the service life of the sliding bearing.

[0022] In some embodiments, the bearing bush assembly includes a bearing bush connection seat, a bearing bush, and an elastic pad connected between the bearing bush connection seat and the bearing bush. The bearing bush and the bearing bush connection seat are respectively arranged on the side close to and far from the rotating shaft in the radial direction of the rotating shaft, and the plurality of first holes are formed on the bearing bush connection seat.

[0023] In these embodiments, the plurality of first holes are formed on the bearing bush connection seat. During the maintenance process, the bearing bush connection seat can be connected to the rotating shaft, so as to realize the fixed connection of each of the plurality of bearing bush assemblies to the rotating shaft. In addition, through the bearing bush connection seat, the bearing bush assembly can be integrally connected to the rotating shaft. Since the bearing bush itself does not directly bear the force of the fixing bolt, this reduces the risk of damage to the bearing bush during installation and disassembly, and thus can avoid damaging the bearing bush and affecting its performance. In addition, if it is necessary to replace the bearing bush assembly, only the bearing bush can be replaced without removing the entire bearing bush connection seat, which can make the maintenance operation faster.

[0024] In some embodiments, the shafting further includes a connecting plate. The first end of the connecting plate is connected to the first hole by a fastener, and the second end of the connecting plate is connected to the second hole by a fastener, so that the bearing block is detachably connected to the rotating shaft.

[0025] In these embodiments, during maintenance, the connection between the bearing block and the rotating shaft is realized by means of the connecting plate to ensure that the bearing block assembly and the rotating shaft do not move relative to each other during the rotation for position adjustment. This method is both reliable and easy to disassemble, enabling the bearing block assembly to be smoothly disassembled from the rotating shaft and refixed on the bearing housing.

[0026] In some embodiments, the bearing housing is provided with a lubricating oil hole for applying lubricating oil between the bearing housing and the bearing block assembly.

[0027] In these embodiments, the lubricating oil can directly enter the interface area between the bearing housing and the bearing through the lubricating oil hole, which can ensure that the interface area between the bearing housing and the bearing block assembly can be well lubricated during rotation, reducing the impact on the overall performance of the sliding bearing.

[0028] In some embodiments, the second hole is disposed outside the radial projection of the bearing block on the rotating shaft.

[0029] In these embodiments, the second hole is disposed outside the radial projection of the bearing block on the rotating shaft. In this way, it can be staggered from the position of the oil groove provided on the rotating shaft. Therefore, the second hole does not interfere with the injection operation of the high-pressure oil in the oil groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] By combining the description of the embodiments with the drawings, the above and / or other features and aspects of the inventive concept will become clear and easy to understand.

[0031] Figure 1 FIG. is a partial structural schematic diagram of a shafting before maintenance as viewed from the front according to an embodiment of the present application;

[0032] Figure 2 FIG. is a partial structural schematic diagram of a shafting after maintenance as viewed from the front according to an embodiment of the present application;

[0033] Figure 3 FIG. is a partial structural schematic diagram of a shafting before maintenance as viewed from the back according to an embodiment of the present application;

[0034] Figure 4 FIG. is a schematic connection structure diagram of a bearing block assembly and a rotating shaft according to an embodiment of the present application;

[0035] Figure 5 FIG. is a structural schematic diagram of a rotating shaft according to an embodiment of the present application;

[0036] Figure 6 It is a schematic structural diagram of a bearing seat connection according to an embodiment of the present application.

[0037] Symbol description:

[0038] 10. Rotating shaft; 11. Second hole; 20. Bearing seat; 30. Bearing assembly; 31. Bearing seat connection; 311. First hole; 32. Bearing; 33. Elastic pad; 34, 35. First bearing assembly; 36, 37. Second bearing assembly; 40. Connecting plate. Detailed implementation manners

[0039] It should be noted that the definitions of orientation words such as "upper", "lower", "top" and "bottom" in the present application are all based on the orientation when the product is placed vertically in the normal use state as the reference direction. It should not be construed as a specific limitation on the embodiments of the present application. In addition, in the context, it also needs to be explained that when it is mentioned that one element is connected to another element, it can be either directly connected or indirectly connected, unless it is clearly stated that one element is directly connected to another element.

[0040] 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, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0041] Example embodiments of the inventive concept will be described in more detail below. Although example embodiments of the inventive concept are described below, it should be understood that the inventive concept can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the inventive concept can be completely conveyed to those skilled in the art.

[0042] The main bearing of a wind turbine is a relatively critical component in the wind turbine, which needs to support the mechanical rotating body (including the impeller). Most main bearings adopt a sliding shaft system, and the sliding bearing needs to bear most of the loads on the impeller. Therefore, the bearing of the sliding bearing is prone to fatigue wear or even failure. With the development trend of wind turbine generators towards large-scale, this situation is becoming more and more significant. Maintaining the bearing of the sliding bearing can not only extend the operating life of the wind turbine, but also reduce the downtime and maintenance costs, ensuring the stability and economic benefits of wind power generation. Therefore, it is particularly important to regularly maintain the bearing of the sliding bearing.

[0043] In the prior art, we usually adopt the method of replacing the bearing bush or the sliding bearing as a whole to complete the regular maintenance of the sliding bearing, and the cost of this maintenance method is relatively high. In addition, for such an operation, it is necessary to disassemble and reassemble the mechanical structure of the wind turbine. The procedure is complex and requires professional technology, which undoubtedly requires strict requirements for the professional technology of personnel.

[0044] In actual work, the inventor found that: due to the uneven distribution of the dynamic load of the impeller, the load borne by the sliding bearing in the circumferential direction is also uneven, resulting in different degrees of damage to the bearing bushes at different positions. As an example, the bearing bushes in the heavy load area wear quickly and severely, while the bearing bushes in other areas except the heavy load area wear relatively slightly.

[0045] Therefore, the inventor believes that during regular maintenance, the positions of the bearing bushes in the sliding bearing can be interchanged to avoid excessive wear of any single bearing bush. By maintaining the sliding bearing in this way, the maintenance time and cost can be reduced, and at the same time, the service life of the sliding bearing can be extended.

[0046] To solve at least one technical problem in the prior art, according to the first aspect of the present application, there is provided a maintenance method for a sliding bearing of a shafting. As shown, the shafting includes a bearing housing 20, a rotating shaft 10 located in the bearing housing 20, and a sliding bearing located between the rotating shaft 10 and the bearing housing 20. The sliding bearing includes a plurality of bearing bush assemblies 30. The plurality of bearing bush assemblies 30 are spaced apart in the circumferential direction of the bearing housing 20, are respectively fixedly connected to the bearing housing 20, and are capable of rotating relative to the rotating shaft 10. The maintenance method of the sliding bearing includes: Figures 1 to 3 As shown, the shafting includes a bearing housing 20, a rotating shaft 10 located in the bearing housing 20, and a sliding bearing located between the rotating shaft 10 and the bearing housing 20. The sliding bearing includes a plurality of bearing bush assemblies 30. The plurality of bearing bush assemblies 30 are spaced apart in the circumferential direction of the bearing housing 20, are respectively fixedly connected to the bearing housing 20, and are capable of rotating relative to the rotating shaft 10. The maintenance method of the sliding bearing includes:

[0047] Step S101, fixedly connecting each of the plurality of bearing bush assemblies 30 to the rotating shaft 10.

[0048] Step S102, removing the connection between each of the plurality of bearing bush assemblies 30 and the bearing housing 20.

[0049] Step S103, rotating the rotating shaft 10 relative to the bearing housing 20 by a predetermined angle, so that the first bearing bush assemblies 34, 35 located at the first position among the plurality of bearing bush assemblies 30 are moved away from the first position, and the second bearing bush assemblies 36, 37 among the plurality of bearing bush assemblies 30 are moved to the first position.

[0050] Step S104, fixedly connecting each of the plurality of bearing bush assemblies 30 to the bearing housing 20.

[0051] Step S105, removing the connection between the bearing bush assembly 30 and the rotating shaft 10.

[0052] According to the maintenance method of the sliding bearing provided by the embodiments of the present application, each bearing bush assembly 30 originally fixedly connected to the bearing housing 20 is temporarily connected to the rotating shaft 10, and then the connection between the bearing housing 20 and each bearing bush assembly 30 is removed. Next, the rotating shaft 10 is rotated to drive the bearing bush assembly 30 to move to a predetermined position. In this way, the positions of each bearing bush assembly 30 are rotated in the circumferential direction of the bearing housing 20, and each bearing bush assembly is fixed to the bearing housing 20 at the moved position. Finally, the connection between the bearing bush assembly 30 and the rotating shaft 10 is removed. In this way, during regular maintenance, the regular rotation of each bearing bush assembly 30 on the sliding bearing can be carried out to avoid excessive wear of any single bearing bush during the entire operation cycle. The sliding bearing is maintained in this way, and the maintenance method is simple, and it can reduce the maintenance time and cost. At the same time, it can also extend the service life of the sliding bearing.

[0053] According to the present application, maintenance can be carried out without completely disassembling the entire bearing structure, which helps to simplify the maintenance process, reduce downtime, extend the service life of the bearing, and save costs. In addition, compared with the method of replacing the bearing bush or the sliding bearing, the maintenance method according to the present application that does not completely disassemble the entire bearing structure has relatively low requirements for the professionalism of personnel, which helps to reduce the dependence on professional maintenance personnel and simplify the operation process.

[0054] In the embodiments of the present application, the first bearing bush assemblies 34, 35 are part of the plurality of bearing bush assemblies 30, and the second bearing bush assemblies 36, 37 are another part of the plurality of bearing bush assemblies.

[0055] According to the present application, the rotating shaft 10 is reasonably rotated so that the positions of the respective bearing bush assemblies 30 are rotated at appropriate positions. By regularly rotating the positions of the bearing bush assemblies 30 on the rotating shaft 10, the wear is evenly distributed on each bearing bush assembly 30. Therefore, the service life of each bearing bush can be maximally utilized, excessive wear of a single bearing bush assembly 30 can be avoided, and all bearing bush assemblies 30 can reach their maximum use potential as much as possible. Therefore, all bearing bush assemblies may reach approximately the same degree of wear, extending the overall replacement cycle. In addition, all bearing bush assemblies 30 may reach the wear limit within a similar time range, which can also facilitate the management of the inventory and ordering cycle of replacement parts.

[0056] Hereinafter, the maintenance method of the sliding bearing according to the present application will be described in conjunction with specific embodiments.

[0057] According to the present application, the sliding bearing is a sliding main bearing that has been applied in each wind turbine, and the maintenance method also includes determining whether the bearing assembly 30 of the sliding bearing needs maintenance. In some embodiments, monitoring can be performed through a state monitoring system to obtain the wear of each bearing assembly 30 during actual operation. As an example, the wear of each bearing assembly 30 during actual operation can be determined by monitoring the temperature, oil pressure feedback and other parameters corresponding to each bearing assembly 30 in the sliding bearing. For example, when the temperature and oil pressure thresholds are exceeded, a prompt message for replacement can be issued through the early warning system. In this case, it can be determined that the bearing assembly 30 needs maintenance. In some embodiments, maintenance personnel will go up the tower during the semi-annual inspection period. The maintenance personnel can perform endoscopic inspection and lubricating oil wear particle inspection on the tower, and based on the inspection results, it can be determined whether there is a sliding bearing that needs maintenance. For example, when the endoscope inspection finds that the surface wear of the sliding bearing is too large and there are more abrasive particles in the surface material of the bearing in the lubricating oil, it is determined that the bearing assembly 30 needs maintenance. In this way, the maintenance time of the sliding bearing can be reasonably allocated so that the applied sliding bearing can reach the maximum service life.

[0058] According to the present application, during the inspection of the sliding bearing, each bearing assembly 30 on the sliding bearing can be calibrated to ensure that it can be identified and facilitate the determination of the rotation angle of the rotating shaft 10 during the later maintenance process. As an example, the outer wall of the bearing seat 20 corresponding to each bearing assembly 30 can be marked to mark the state of each bearing assembly 30 during operation, and the bearing assembly to be rotated can be determined according to the actual situation to determine the rotation angle through calculation, thereby ensuring that each bearing assembly 30 can return to the correct position for installation after rotation.

[0059] According to the present application, the maintenance method further includes determining whether the applied sliding bearing is suitable for the maintenance method. When it is detected that a part of the bearing bush assembly 30 in the sliding bearing is worn, and there is another part of the bearing bush assembly 30 other than the part that can be replaced with it, it is determined that the sliding bearing is suitable for the maintenance method. In the case that the applied sliding bearing is not suitable for the maintenance method, the maintenance of the sliding bearing can only be performed by replacing the entire bearing.

[0060] According to the present application, when it is determined that the sliding bearing needs maintenance, the rotation angle of the sliding bearing is determined. In some embodiments, the sliding bearing is a sliding bearing in which each bearing bush assembly 30 is evenly distributed between the bearing seat 20 and the rotating shaft 10. In actual operation, the angle difference between the rotating bearing bush assemblies can be determined based on actual needs to calculate and determine the predetermined angle that needs to be rotated.

[0061] In some embodiments, the rotation angle of the sliding bearing can be obtained by calculation. As an example, there are 6 bearing bush assemblies 30 arranged at equal intervals in the sliding bearing. In the case where two adjacent bearing bush assemblies 30 at the lower end of the rotating shaft 10 are worn, they can be moved away from the first position, and two adjacent bearing bush assemblies 30 at the upper end of the rotating shaft 10 can be moved to the first position. Since the angle between two adjacent bearing bush assemblies 30 is fixed, thus, after determining the replaced bearing bush assemblies, the predetermined angle to be rotated can be obtained by calculation.

[0062] Figure 1 is a partial structural schematic diagram of a shafting as viewed from the front before maintenance according to an embodiment of the present application, Figure 2 is a partial structural schematic diagram of a shafting as viewed from the front after maintenance according to an embodiment of the present application. Specifically, Figure 1 shows a schematic diagram of the relative positions of each bearing bush assembly before maintenance. In Figure 1 the case where each of the multiple bearing bush assemblies 30 in is fixedly connected to the rotating shaft 10, on the basis of Figure 1 after rotating the rotating shaft counterclockwise by 120 degrees, the structural schematic shown in Figure 2 is obtained. In this way, the relative positions of each bearing bush assembly 30 in the bearing housing are changed. Specifically, by rotating the rotating shaft 10 counterclockwise, driven by the rotating shaft 10, the first bearing bush assemblies 34, 35 are moved away from the corresponding positions A1, A2 (equivalent to the first position mentioned in the above embodiment), and the second bearing bush assemblies 36, 37 are moved from the positions B1, B2 to the positions A1, A2. The above describes an example of replacing two bearing bush assemblies at a time. It should be noted that the present application does not limit the number of bearing bush assemblies replaced each time. For example, but not limited to, replacing one bearing bush assembly at a time. Specifically, referring to Figure 1 it is also possible to only move the first bearing bush assembly 34 from the position A1 to the position A2 of the first bearing bush assembly 35. In this case, the second bearing bush assembly 37 will also move from the position B2 to the position A1 of the first bearing bush assembly 34, and the second bearing bush assembly 36 will also move from the position B1 to the position B2 of the second bearing bush assembly 37.

[0063] According to the present application, the bearing assembly 30 can have a variety of structural forms. The bearing assembly 30 is used to provide a sliding interface between the rotating shaft 10 and the bearing seat 20. In some embodiments, the bearing assembly 30 is an arc-shaped bearing, one end of which is detachably fixed to the bearing seat 20, and the other end is slidably connected to the rotating shaft 10. In other embodiments, the bearing assembly 30 includes a bearing and other components besides the bearing. For example, but not limited to, elastic pads and the like. The provision of other components such as elastic pads can help the bearing adapt to deformation and environmental conditions during operation. Specifically, the introduction of elastic pads 33 can buffer shocks and vibrations, protect the bearing from excessive forces directly acting on the rotating shaft, and thus extend the service life of the bearing 32. In addition, the provision of elastic pads can facilitate maintenance operations in the case of overall replacement, and can provide an interface for quickly disassembling and replacing the bearing.

[0064] In some embodiments, the bearing assembly 30 includes a bearing seat 31, a bearing 32, and an elastic pad 33 connected between the bearing seat 31 and the bearing 32. The bearing seat 31 is used to be fixedly connected to the bearing seat 20, and the bearing 32 is in sliding contact with the rotating shaft 10. As an example, the elastic pad 33, the bearing 32 and the bearing seat 31 are formed as an integral part, and the elastic pad 33, the bearing 32 and the bearing seat 31 are limited by pin holes and positioning pins. When the bearing seat 31 is fixed to the bearing seat 20, the limiting effect of the positioning pin will prevent the elastic pad and the bearing 32 from falling out. These components form a sliding bearing of the shaft system as a whole. The bearing 32 is the main key component of the sliding bearing. Wear during use is mainly manifested on the bearing, while the bearing seat 31 and other components generally rarely have problems, so the maintenance of the sliding bearing is generally the maintenance of the bearing. S101 , in the step of fixedly connecting each of the plurality of bearing bush assemblies 30 to the rotating shaft 10 , includes fixedly connecting the bearing bush connecting seat 31 to the rotating shaft 10 .

[0065] In these embodiments, during maintenance, the bearing bush connection seat 31 is connected to the rotating shaft 10 to achieve fixed connection of each of the plurality of bearing bush assemblies to the rotating shaft. In addition, the bearing bush assembly 30 is integrally connected to the rotating shaft 10 through the bearing bush connection seat 31. Since the bearing bush 32 itself does not directly bear the force of the fixing bolt, the risk of damage to the bearing bush 32 during installation and removal is reduced, thereby avoiding damage to the bearing bush and affecting the performance of the bearing bush 32. In addition, if the bearing bush assembly needs to be replaced, only the bearing bush 32 can be replaced without removing the entire sliding bearing, so that maintenance operations can be performed more quickly.

[0066] like Figure 3 and Figure 4As shown, the connecting plate 40 is used to fixedly connect the bearing seat 31 and the rotating shaft 10. The connecting plate 40 is L-shaped. In the step of fixedly connecting each of the plurality of bearing assemblies 30 to the rotating shaft 10, at one axial end of the bearing assembly 30, the two ends of the connecting plate 40 are detachably connected to the bearing seat 31 and the rotating shaft 10 respectively. Figure 3 The structure example of connecting the bearing seat 31 and the rotating shaft 10 through the connecting plate is shown. Additionally, Figure 3 Only the structure example of one bearing assembly connected to the rotating shaft is shown. It should be noted that other bearing assemblies can also be connected to the rotating shaft 10 in the same way.

[0067] In the embodiment of the present application, the L-shaped connecting plate 40 can be configured as a set with the sliding bearing.

[0068] In this embodiment, the L-shaped connecting plate 40 is used to fixedly connect the bearing seat 31 and the rotating shaft 10. The L-shaped connecting plate 40 can provide good mechanical properties. One end of the connecting plate 40 is connected to the bearing seat 31, and the other end is connected to the rotating shaft 10, so that the distribution of force and weight is more uniform. Additionally, the two ends of the connecting plate 40 are respectively detachably connected to the bearing seat 31 and the rotating shaft 10. In this way, it can be ensured that the bearing assembly and the rotating shaft are easy to separate after maintenance, and the bearing assembly 30 can be smoothly disassembled from the rotating shaft 10 and refixed on the bearing seat 20.

[0069] In these embodiments, by setting the connecting plate 40 as a connecting bridge to connect each bearing assembly 30 and the rotating shaft 10, the setting of the connecting plate 40 enables maintenance personnel to easily temporarily fix the bearing assembly, and at the same time can avoid interference with other surrounding components, thereby improving the efficiency and safety of maintenance. In addition, the setting of the L-shaped connecting plate 40 can also improve the firmness of the connection between the bearing seat 31 and the rotating shaft 10, avoiding problems such as connection loosening and failure.

[0070] In some embodiments, a plurality of first holes 311 are respectively provided on the plurality of bearing assemblies 30, a plurality of spaced second holes 11 are provided on the rotating shaft 10, the two ends of the connecting plate 40 are respectively provided with a first connecting through hole and a second connecting through hole, a first fastener passes through the first connecting through hole and is connected to the first hole 311, and a second fastener passes through the second connecting through hole and is connected to the second hole 11, thereby detachably connecting the two ends of the connecting plate 40 to the bearing seat 31 and the rotating shaft 10 respectively, and realizing the temporary fixed connection of each bearing assembly 30 and the rotating shaft 10.

[0071] In some embodiments, the second hole 11 is disposed outside the radial projection of the bearing shell 32 on the rotating shaft 10. In this way, the second hole avoids the contact surface area between the rotating shaft 10 and the bearing shell 32, and can be staggered from the position of the oil groove provided on the rotating shaft. Therefore, the second hole does not interfere with the injection operation of the high-pressure oil in the oil groove.

[0072] In these embodiments, by providing an oil groove on the contact surface between the rotating shaft 10 and the bearing shell assembly 30 and injecting high-pressure oil during rotation to form an oil film, the normal operation of the sliding bearing can be protected, the influence on the performance of the sliding bearing can be reduced, and the service life of the bearing can be extended. The second hole on the rotating shaft 10 is arranged in a staggered manner with the oil groove so that it does not interfere with the injection operation of the high-pressure oil in the oil groove, which can ensure that the injection operation of the high-pressure oil is not affected during operation.

[0073] In some embodiments, in the step of rotating the rotating shaft 10 relative to the bearing housing 20 by a predetermined angle, lubricating oil is applied between the bearing shell assembly 30 and the bearing housing 20. As an example, the bearing housing 20 is provided with a lubricating oil hole for applying lubricating oil between the bearing housing 20 and the bearing shell assembly 30. One end of the maintenance lubrication pipeline can be connected to the lubricating oil hole on the bearing housing to convey lubricating oil between the bearing housing 20 and the bearing shell connecting seat 31, and the other end of the maintenance lubrication pipeline is connected to a mechanical pump for providing power for pumping lubricating oil.

[0074] In these embodiments, applying lubricating oil between the bearing shell assembly 30 and the bearing housing 20 before rotating the rotating shaft 10 relative to the bearing housing 20 by a predetermined angle can ensure that the interface area between the bearing housing 20 and the bearing shell assembly 30 can be well lubricated during rotation, thereby reducing the influence on the overall performance of the sliding bearing.

[0075] In some embodiments, the sliding bearing is the main bearing of a wind turbine generator set, and the maintenance method further includes: locking the impeller of the wind turbine generator set before the step of fixedly connecting each of the plurality of bearing shell assemblies 30 to the rotating shaft 10, and unlocking the impeller after the step of removing the connection between each of the plurality of bearing shell assemblies 30 and the bearing housing 20.

[0076] In these embodiments, locking the impeller of the wind turbine generator set before the step of fixedly connecting each of the plurality of bearing shell assemblies 30 to the rotating shaft 10 can effectively prevent the wind turbine generator set from accidentally starting or rotating during maintenance. Thus, it helps to improve the safety of maintenance operations and can protect the safety of maintenance personnel. Unlocking the impeller after the step of removing the connection between each of the plurality of bearing shell assemblies 30 and the bearing housing 20 ensures the normal rotation of the rotating shaft 10 to drive the positions of the respective bearing shell assemblies to the designated positions after maintenance.

[0077] Since maintenance personnel cannot be located inside the rotating shaft, and the possibility of maintenance personnel manually driving the rotation of the rotating shaft is extremely low. In some embodiments, in the step of rotating the rotating shaft 10 relative to the bearing housing 20 by a predetermined angle, the barring gear system of the wind turbine generator is utilized to rotate the rotating shaft 10. In some exemplary embodiments, during maintenance, the rotation angle can be monitored through an angle sensor. When using the barring gear system for rotation, the rotation angle is identified and controlled through the angle sensor. Thus, the barring gear system can rotate the rotating shaft 10 relative to the bearing housing 20 by a predetermined angle.

[0078] In these embodiments, by judging the wear condition and initial design of the sliding bearing, the angle that needs to be rotated can be determined, and then the barring gear system of the wind turbine generator is used to realize the rotation of the rotating shaft, which can effectively ensure the feasibility of the maintenance operation. Thus, the operation efficiency and convenience can be improved, which is beneficial to ensuring the normal operation and maintenance of the sliding bearing.

[0079] According to the present application, after rotating to the target angle, since the hole for connecting the bearing bush connecting seat 31 to the bearing housing 20 is an oblong hole, even if there is a certain deviation in the angle after rotation, it can ensure that each bearing bush assembly 30 can be refixed to the bearing housing 20.

[0080] According to the present application, the shafting is a sliding shafting. The sliding shafting includes a bearing housing 20, a rotating shaft 10 located in the bearing housing 20, and a plurality of bearing bush assemblies 30 located between the rotating shaft 10 and the bearing housing 20. The plurality of bearing bush assemblies 30 are spaced apart in the circumferential direction of the bearing housing 20, are respectively fixedly connected to the bearing housing 20, and can rotate relative to the rotating shaft 10. In the wind turbine generator, the bearing housing 20 is fixed to some components of the wind turbine generator, and the plurality of bearing bush assemblies 30 are detachably connected to the bearing housing 20 through fixing bolts.

[0081] According to the present application, after completion of maintenance and installation, appropriate tests are carried out on the sliding bearing to confirm that it can operate normally.

[0082] According to another aspect of the present application, another method for maintaining a sliding bearing is provided. Specifically, the method for maintaining a sliding bearing may include the following steps:

[0083] Step S100, lock the impeller of the wind turbine generator.

[0084] Step S200, connect the bearing shell assembly 30 to the rotating shaft 10 by using the connecting plate 40. Specifically, a first hole 311 and a second hole 11 are respectively formed on the bearing shell connecting seat 31 of the bearing shell assembly 30 and the rotating shaft 10. First connecting through holes and second connecting through holes are respectively provided at both ends of the connecting plate 40. The first fastener passes through the first connecting through hole and is connected to the first hole 311, and the second fastener passes through the second connecting through hole and is connected to the second hole 11, thereby connecting the bearing shell assembly 30 to the rotating shaft 10 by using the connecting plate 40.

[0085] Step S300, remove the fixing bolts of the bearing shell assembly 30 and the bearing housing 20 to disconnect the bearing shell assembly 30 from the bearing housing 20.

[0086] Step S400, release the impeller lock, and rotate the rotating shaft 10 by an angle through the barring gear system, so as to drive the plurality of bearing shell assemblies 30 to rotate by a preset angle, realizing the position rotation of each bearing shell assembly on the bearing housing 20.

[0087] Step S500, after rotation, fix the bearing shell assembly 30 at each new position to the bearing housing 20, and then remove the connection between the bearing shell assembly 30 and the rotating shaft 10.

[0088] According to the second aspect of the present application, there is provided a shafting system, wherein, as Figure 1 、 Figure 2 、 Figure 5 and Figure 6 , the shafting system includes a bearing housing 20, a rotating shaft 10 located in the bearing housing 20, and a sliding bearing located between the rotating shaft 10 and the bearing housing 20. Wherein, the sliding bearing includes a plurality of bearing shell assemblies 30, and the plurality of bearing shell assemblies 30 are spaced apart in the circumferential direction of the bearing housing 20 and are respectively fixedly connected to the bearing housing 20. First holes 311 are respectively provided on the plurality of bearing shell assemblies 30, and a plurality of spaced second holes 11 are provided on the rotating shaft 10, so that when applying the maintenance method for the sliding bearing of the shafting system described above, each of the plurality of bearing shell assemblies 30 is fixedly connected to the rotating shaft 10 through the first hole 311 and the second hole 11.

[0089] According to the shafting provided by the embodiments of the present application, when it is determined that the currently used sliding bearing can meet the maintenance method of the present application, each bearing bush assembly 30 originally fixedly connected to the bearing housing 20 is temporarily connected to the rotating shaft 10, and then the connection between the bearing housing 20 and each bearing bush assembly 30 is removed. Next, the rotating shaft 10 is rotated to drive the bearing bush assembly 30 to move to a predetermined position. In this way, the positions of each bearing bush assembly 30 are interchanged in the circumferential direction of the bearing housing 20, and each bearing bush assembly is fixed to the bearing housing 20 at the moved position. Finally, the connection between the bearing bush assembly 30 and the rotating shaft 10 is removed. In this way, during regular maintenance, the regular rotation of each bearing bush assembly 30 on the sliding bearing is carried out to avoid excessive wear of any single bearing bush during the entire operation cycle. By maintaining the sliding bearing in this way, the maintenance time and cost can be reduced, and at the same time, the service life of the sliding bearing can be extended.

[0090] In some embodiments, both the first hole 311 and the second hole 11 are bolt holes. A fastening bolt is used to connect the two ends of the connecting plate 40 to the first hole and the second hole respectively to fix the bearing bush assembly to the rotating shaft. A plurality of second holes 11 are located on the rotating shaft 10 and are arranged in clearance correspondence with the first hole 311 to facilitate the fixed connection of the fastening bolt.

[0091] In some embodiments, the bearing bush assembly 30 includes a bearing bush connection seat 31, a bearing bush 32, and an elastic pad 33 connected between the bearing bush connection seat 31 and the bearing bush 32. The bearing bush connection seat 31 is used for fixedly connecting to the bearing housing 20. The bearing bush 32 is in sliding contact with the rotating shaft 10. A plurality of the first holes 311 are formed on the bearing bush connection seat 31.

[0092] In these embodiments, a plurality of first holes 311 are formed on the bearing bush connection seat 31. During maintenance, the bearing bush connection seat can be connected to the rotating shaft, so as to realize the fixed connection of each of the plurality of bearing bush assemblies to the rotating shaft. In addition, the bearing bush assembly 30 is integrally connected to the rotating shaft 10 through the bearing bush connection seat 31. Since the bearing bush 32 itself does not directly bear the force of the fixing bolt, the risk of damage to the bearing bush 32 during installation and disassembly is reduced, thereby avoiding damage to the bearing bush and affecting the performance of the bearing bush 32. In addition, if the bearing bush assembly needs to be replaced, only the bearing bush 32 can be replaced without having to remove the entire bearing bush connection seat 31, which can perform maintenance operations more quickly.

[0093] In some embodiments, the shafting further includes a connecting plate 40. The first end of the connecting plate 40 is connected to the first hole through a fastener, and the second end of the connecting plate 40 is connected to the second hole through a fastener, so that the bearing bush connection seat 31 is detachably connected to the rotating shaft 10.

[0094] In these embodiments, during maintenance, the connection between the bearing block seat 31 and the rotating shaft 10 is achieved by means of a connecting plate to ensure that the bearing block assembly 30 and the rotating shaft 10 do not move relative to each other during rotation and position adjustment. This method is both reliable and easy to disassemble.

[0095] In some embodiments, a lubricating oil hole is provided in the bearing block 20, and the lubricating oil hole is used to apply lubricating oil between the bearing block 20 and the bearing block assembly 30.

[0096] In these embodiments, the lubricating oil can directly enter the interface area between the bearing block and the bearing through the lubricating oil hole, so that the interface area between the bearing block 20 and the bearing block assembly 30 is well lubricated, reducing the impact on the overall performance of the sliding bearing.

[0097] Although the present invention has been specifically shown and described with reference to the exemplary embodiments of the present invention, those of ordinary skill in the art will understand that various changes in form and details can be made herein without departing from the spirit and scope of the present invention as defined by the claims and their equivalents. The embodiments should be considered only in a descriptive sense and not for purposes of limitation. Therefore, the scope of the present invention is not defined by the specific embodiments of the present invention, but by the claims, and all differences within the scope will be construed as being included in the present invention.

Claims

1. A maintenance method for a sliding bearing of a shafting system, the shafting system including a bearing housing (20), a rotating shaft (10) located in the bearing housing (20), and a plurality of bearing bush assemblies (30) located between the rotating shaft (10) and the bearing housing (20), the plurality of bearing bush assemblies (30) being spaced apart in the circumferential direction of the bearing housing (20), fixedly connected to the bearing housing (20) respectively, and capable of rotating relative to the rotating shaft (10), characterized in that, The maintenance method includes: Fixing each of the plurality of bearing bush assemblies (30) to the rotating shaft (10); Removing the connection between each of the plurality of bearing bush assemblies (30) and the bearing housing (20); Rotating the rotating shaft (10) relative to the bearing housing (20) by a predetermined angle, so that the first bearing bush assemblies (34, 35) located at the first position among the plurality of bearing bush assemblies (30) are moved away from the first position, and causing the second bearing bush assemblies (36, 37) among the plurality of bearing bush assemblies (30) to move to the first position; Fixing each of the plurality of bearing bush assemblies (30) to the bearing housing (20); Removing the connection between the bearing bush assembly (30) and the rotating shaft (10).

2. The maintenance method for a sliding bearing used in a shafting system according to claim 1, characterized in that, The bearing bush assembly (30) includes a bearing bush connection seat (31), a bearing bush (32), and an elastic pad (33) connected between the bearing bush connection seat (31) and the bearing bush (32). The step of fixing each of the plurality of bearing bush assemblies (30) to the rotating shaft (10) includes: fixing the bearing bush connection seat (31) to the rotating shaft (10).

3. The maintenance method for a sliding bearing of a shafting according to claim 2, characterized in that, Fixing the bearing bush connection seat (31) to the rotating shaft (10) by using a connecting plate. The step of fixing each of the plurality of bearing bush assemblies (30) to the rotating shaft (10) includes: at one axial end of the bearing bush assembly (30), detachably connecting two ends of the connecting plate to the bearing bush connection seat (31) and the rotating shaft (10) respectively.

4. The maintenance method for a sliding bearing of a shafting according to claim 1, characterized in that, In the step of rotating the rotating shaft (10) relative to the bearing housing (20) by a predetermined angle, it includes applying lubricating oil between the bearing bush assembly (30) and the bearing housing (20).

5. The maintenance method for a sliding bearing used in a shafting system according to claim 1, characterized in that, The sliding bearing is the main bearing of a wind turbine generator set. The maintenance method further includes: Locking the impeller of the wind turbine generator set before the step of fixing each of the plurality of bearing bush assemblies (30) to the rotating shaft (10); Unlocking the impeller after the step of removing the connection between each of the plurality of bearing bush assemblies (30) and the bearing housing (20).

6. The maintenance method for a sliding bearing of a shafting according to claim 5, wherein In the step of rotating the rotating shaft (10) relative to the bearing housing (20) by a predetermined angle, the rotating shaft (10) is rotated by using the barring gear system of the wind turbine generator set.

7. The maintenance method for a sliding bearing of a shafting according to claim 1, characterized in that, The first position is located below the rotating shaft (10).

8. The maintenance method for a sliding bearing of a shafting according to claim 1, characterized in that, The first bearing bush assemblies (34, 35) are at least two bearing bush assemblies (30) located below the rotating shaft (10).

9. A shafting system, characterized in that, The shafting system includes a bearing housing (20), a rotating shaft (10) located in the bearing housing (20), and a plurality of bearing bush assemblies (30) located between the rotating shaft (10) and the bearing housing (20). The plurality of bearing bush assemblies (30) are spaced apart in the circumferential direction of the bearing housing (20). A plurality of first holes (311) are respectively provided on the plurality of bearing bush assemblies (30). A plurality of second holes (11) corresponding to the first holes (311) are spaced apart in the circumferential direction of the rotating shaft (10), so that when applying the maintenance method of the sliding bearing for the shafting system according to any one of claims 1-8, each of the plurality of bearing bush assemblies (30) is fixedly connected to the rotating shaft (10) through the first holes (311) and the second holes (11).

10. The shafting according to claim 9, characterized in that, The bearing bush assembly (30) includes a bearing bush connecting seat (31), a bearing bush (32), and an elastic pad (33) connected between the bearing bush connecting seat (31) and the bearing bush (32). The bearing bush (32) and the bearing bush connecting seat (31) are respectively arranged on the side close to and far from the rotating shaft in the radial direction of the rotating shaft (10). The plurality of first holes (311) are formed on the bearing bush connecting seat (31).

11. The shafting according to claim 9, characterized in that, The bearing housing (20) is provided with a lubricating oil hole for applying lubricating oil between the bearing housing (20) and the bearing bush assembly (30).

12. The shafting according to claim 9, characterized in that, The second hole (11) is arranged outside the radial projection of the bearing bush (32) on the rotating shaft (10).

13. A wind turbine generator, characterized in that, The wind turbine generator set includes the shafting system according to any one of claims 9-12.

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