Double-arrangement replaceable self-aligning sliding bearing integrated fan main shaft system

Abstract

The invention discloses a double-arrangement replaceable self-aligning sliding bearing integrated fan main shaft shafting which comprises a fan main shaft, a bearing seat, a plurality of sliding bearing blocks and an oil bag, and the two sides of an isolating ring are each provided with a bearing block containing groove formed in the circumferential direction of a shaft neck; a plurality of oil groove oil outlets are formed in the two sides of the main shaft oil grooves; a plurality of sliding bearing blocks are uniformly distributed in the bearing block placing groove; the oil bags and the sliding bearing block are arranged at intervals, a through oil scraper oil inlet hole is formed in the lower portion of the oil scraper, and the middle of the oil scraper oil inlet hole is communicated with an oil scraper oil outlet hole. And the bearing seat is arranged outside the sliding bearing block. According to the double-row self-aligning roller bearing, the sliding bearing and related matching parts are integrally copied to form the double-row self-aligning roller bearing, various loads borne by the fan main shaft are borne by the sliding bearing of a single type, meanwhile, the adaptive capacity of the bearing to installation errors and deformation generated in the operation process is improved through the self-aligning design, and the service life of the bearing is prolonged. And the economical efficiency and the reliability of the fan main shaft are improved.

Description

Technical Field

[0001] The invention belongs to the field of wind turbine main shafts, and in particular relates to a wind turbine main shaft system with double-row replaceable self-aligning sliding bearings integrated therein. Background Art

[0002] In recent years, with the continuous growth of global demand for renewable energy, the wind power industry has ushered in unprecedented development opportunities, and the design and manufacturing technology of wind turbine products has been rapidly iterated, especially reflected in the trend of large-scale wind turbines. This trend aims to improve power generation efficiency by increasing the capacity of a single unit, thereby reducing the cost per kilowatt-hour. However, this also puts forward more stringent requirements on the key components of wind turbines, especially the main shaft bearings. As wind turbines become larger, the rolling bearings used in the main shaft position of wind turbines are getting larger, heavier, and more expensive, which makes the weight and cost of main bearings in large wind turbines gradually increase, which is contrary to the goal of large-scale wind turbines to reduce the cost per kilowatt.

[0003] Traditionally, the main shaft of the fan is supported by rolling bearings. However, as the size of the fan continues to increase, the size, weight and cost of the rolling bearings have also increased dramatically, becoming one of the important factors affecting the economic efficiency of the fan. Large rolling bearings not only face many challenges in the production, transportation and installation process, but their high maintenance costs and complex replacement process have become the key bottleneck restricting the long-term operation efficiency of the fan.

[0004] In order to meet this challenge, the industry began to explore the technical path of "sliding instead of rolling", that is, using sliding bearings to replace traditional rolling bearings on the main shaft of the wind turbine. Compared with rolling bearings, sliding bearings have the advantages of strong load-bearing capacity, smooth operation, and low noise, especially under large and heavy load conditions. However, the application of sliding bearings also brings new problems: first, sliding bearings are highly dependent on the lubrication system, so a more complex and reliable lubrication system is required, which will increase additional costs; second, the stress conditions at the main shaft of the wind turbine are extremely complex. Not only must it withstand huge radial loads, but it must also cope with axial loads and multi-directional composite forces such as overturning moments under abnormal wind loads. This places extremely high demands on the material selection, structural design, and manufacturing process of sliding bearings. Any carelessness may cause premature failure of the bearing, increase the failure rate, and increase the difficulty of operation and maintenance. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a fan main shaft system with an integrated double-row replaceable self-aligning sliding bearing. Through the double-row self-aligning design, a single type of sliding bearing can bear various loads on the fan main shaft without the need for additional configuration of other types of sliding bearings. This not only simplifies the shaft system structure and reduces costs, but also improves the bearing's adaptability to installation errors and deformations generated during operation through the self-aligning design, thereby improving the economy and reliability of the fan main shaft.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A fan main shaft system with double-row replaceable self-aligning sliding bearings, comprising:

[0008] A fan main shaft, wherein the fan main shaft is provided with a journal, a spacer ring is provided in the middle of the journal, and a bearing block placement groove arranged along the circumference of the journal is provided on both sides of the spacer ring; a plurality of main shaft oil grooves are provided on the spacer ring, and a plurality of oil outlet holes are provided on both sides of the main shaft oil groove;

[0009] A plurality of sliding bearing blocks are evenly distributed in the bearing block placement groove, and the outer end surface of the sliding bearing block is shaped like the arc surface of the roller in the rolling bearing;

[0010] A plurality of oil bags are arranged at intervals with the sliding bearing block, an oil scraper slot is provided inside the oil bag, an oil scraper is installed in the oil scraper slot, the oil scraper divides the oil bag into two oil bag chambers, an oil bag cover plate is provided at the upper part of the oil bag chamber, an oil bag oil inlet hole is provided on one side of each oil bag chamber, and the oil bag oil inlet hole corresponds to the position of the oil tank oil outlet hole on one side of the main shaft oil tank, a through oil scraper oil inlet hole is provided at the lower part of the oil scraper, the middle part of the oil scraper oil inlet hole is connected with an oil scraper oil outlet hole, the upper end of the oil scraper oil outlet hole is located at the outer end face of the oil scraper, and the outer end face of the oil scraper is matched with the outer end face of the sliding bearing block;

[0011] The bearing seat is installed on the outside of the sliding bearing block, the inner wall of the bearing seat is matched with the sliding bearing block and the oil scraper, and an oil film is formed between the inner wall of the bearing seat and the outer arc surface of the sliding bearing block and the oil scraper; the bearing seat is provided with an oil filling hole, the oil filling hole is opened in the non-load-bearing area of ​​the bearing seat, the oil filling hole corresponds to the position of the main shaft oil groove, and sealing members are provided on both sides of the bearing seat for sealing the sliding bearing.

[0012] Furthermore, the sliding bearing blocks are symmetrically arranged in the bearing block placement grooves on both sides, or the sliding bearing blocks are staggeredly arranged in the bearing block placement grooves on both sides.

[0013] Furthermore, a plurality of connecting holes are provided at the lower part of the oil scraper, and the connecting holes connect the oil bag cavities on both sides so that the lubricating oil in the two oil bag cavities is evenly distributed.

[0014] Furthermore, the journal, the steel back of the sliding bearing block, and the oil bag are made of alloy steel with the same properties, and the working surface material of the sliding bearing is made of steel back, alloy layer and coating.

[0015] Furthermore, a bearing pad groove is provided on one side of the bearing block placement groove, and one side of the bearing pad groove passes through the shaft neck, and a plurality of semi-threaded holes 1 are provided at the lower part of the bearing pad groove; a bearing pad is installed inside the bearing pad groove, and the upper surface of the bearing pad is flush with the bearing block placement groove, and the bearing pad and the bearing block placement groove jointly support the sliding bearing block; a semi-threaded hole 2 corresponding to the semi-threaded hole 1 is provided at the lower part of the bearing pad, and the semi-threaded hole 1 and the semi-threaded hole 2 constitute a complete threaded hole, and the semi-threaded hole 1 and the semi-threaded hole 2 are internally threadedly connected with screws for fixing the bearing pad to the shaft neck; oil bag mounting grooves are arranged at intervals on the bearing block placement groove, and the oil bag is installed in the oil bag mounting groove.

[0016] Furthermore, a plurality of first threaded holes are provided on one side of the sliding bearing block, and the first threaded holes are arranged in the axial direction of the sliding bearing block for connection with a disassembly tool.

[0017] Furthermore, the bearing seat is provided with a plurality of inspection openings, which correspond to the positions of the sliding bearing blocks. The inspection openings are opened in the non-stress bearing area of ​​the bearing seat, and inspection window covers are installed on the inspection openings.

[0018] Furthermore, a plurality of second threaded holes are provided on one side of the sliding bearing block, and the second threaded holes are arranged at circumferential positions of the sliding bearing block for connection with a disassembly tool.

[0019] Furthermore, a plurality of positioning holes 1 are provided on the bearing block placement groove, and a positioning hole 2 is provided at the lower part of the sliding bearing block. The positions of positioning hole 1 and positioning hole 2 correspond to each other. A positioning pin is provided in positioning hole 1, and one end of the positioning pin is interference fit with positioning hole 1, and the other end of the positioning pin is transition fit with positioning hole 2.

[0020] Furthermore, an oil bag pressure groove is provided at the lower part of the sliding bearing block, and oil bag wings are provided on both sides of the oil bag. The oil bag wings are pressed into the oil bag pressure groove of the sliding bearing block, and a pin hole groove for avoiding the positioning pin is provided on one side of the oil bag wing.

[0021] The beneficial effects of the present invention are:

[0022] 1) The present invention realizes that a single type of sliding bearing carries various loads on the fan main shaft by integrating the sliding bearing and related matching parts into a double-row spherical roller bearing. At the same time, the self-aligning design improves the bearing's adaptability to installation errors and deformations generated during operation, thereby improving the economy and reliability of the fan main shaft.

[0023] 2) The journal, steel back of the sliding bearing block and the oil bag are made of alloy steel with the same properties. The working surface material of the sliding bearing is made of steel back, alloy layer and coating. The alloy layer meets the requirements of impact resistance and wear resistance, and the coating meets the requirements of initial running-in or frequent starting and stopping under low speed and heavy load conditions, and even restarting after long-term shutdown.

[0024] 3) A maintenance and replacement solution for the sliding bearing block is provided, that is, when the sliding bearing block is abnormally worn, the seal is removed, the sliding bearing block to be replaced is rotated to a non-stress bearing area, and then the bearing pad is removed and the sliding bearing block is axially removed for maintenance or replacement.

[0025] 4) Another maintenance and replacement solution for the sliding bearing block is provided, that is, when the sliding bearing block is abnormally worn, the inspection window cover is opened, the sliding bearing block to be replaced is rotated to the inspection port, and the sliding bearing block is radially removed for maintenance or replacement. There is no need to remove the seal or arrange the bearing pads, so that the sliding bearing blocks in different positions can be maintained or replaced in the same fixed position, and can be quickly replaced in the cabin, reducing the maintenance cycle and replacement cost.

[0026] 5) By setting a threaded hole in the axial direction or the axial direction of the sliding bearing block, a disassembly tool is installed when the sliding bearing block is disassembled, which facilitates the application of force when the sliding bearing block is disassembled.

[0027] 6) By setting a positioning hole 1 on the bearing block placement groove and setting a positioning hole 2 on the lower part of the sliding bearing block, the position of the sliding bearing block is quickly positioned using a positioning pin, thereby improving the efficiency of installing or maintaining the sliding bearing block and the accuracy of the installation position of the sliding bearing block.

[0028] 7) An oil bag pressure groove is arranged at the lower part of the sliding bearing block, oil bag wings are arranged on both sides of the oil bag, a pin hole groove for avoiding the positioning pin is arranged on one side of the oil bag wing, and the oil bag wing is pressed into the oil bag pressure groove of the sliding bearing block to ensure the stability of the oil bag installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the bearing seat structure of Example 1.

[0030] Figure 2 It is a cross-sectional view of the fan main shaft system of Example 1.

[0031] Figure 3 This is a schematic diagram of the fan main shaft structure in Example 1.

[0032] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0033] Figure 5It is a schematic diagram of the assembly of the fan main shaft, sliding bearing block, bearing pad and oil bag in Example 1.

[0034] Figure 6 It is a schematic diagram of the structure of the sliding bearing block of Example 1.

[0035] Figure 7 It is a schematic diagram of the bearing pad structure.

[0036] Figure 8 This is a bottom view of the bearing pad.

[0037] Fig. 9 It is an exploded view of the oil bag and the oil scraper of Example 1.

[0038] Fig.10 It is a schematic diagram of the bearing seat structure of Example 1.

[0039] Fig.11 It is a cross-sectional view of the fan main shaft system of Example 2.

[0040] Fig.12 This is a schematic diagram of the fan main shaft structure in Example 2.

[0041] Fig.13 yes Fig.12 Enlarged view of point B in the middle.

[0042] Fig.14 It is a schematic diagram of the structure of the sliding bearing block of Example 2.

[0043] Fig.15 It is a bottom view of the sliding bearing block of Example 2.

[0044] Fig.16 It is a schematic diagram of the oil bag and oil scraper assembly of Example 2.

[0045] In the figure, 1. fan main shaft; 11. journal; 12. bearing block placement groove; 13. isolation ring; 14. main shaft oil groove; 15. oil groove oil outlet hole; 16. semi-threaded hole one; 17. bearing pad groove; 18. positioning hole one; 19. oil bag installation groove; 2. sliding bearing block; 21. first threaded hole; 22. positioning hole two; 23. positioning pin; 24. oil bag pressure groove; 25. second threaded hole; 3. bearing pad; 31. semi-threaded hole two; 4. oil bag; 41. oil bag cavity; 42. oil scraper slot; 43. oil bag oil inlet hole; 44. oil bag cover plate; 45. oil bag wing plate; 46. pin hole groove; 5. oil scraper; 51. connecting hole; 52. oil scraper oil inlet hole; 53. oil scraper oil outlet hole; 6. bearing seat; 61. oil filling hole; 62. inspection window cover plate; 63. inspection port; 7. sealing member. DETAILED DESCRIPTION

[0046] The following will be combined with the attached Figure 1-Figure 16, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0048] Example 1

[0049] like Figure 1-Figure 3 As shown, a fan main shaft system with double-row replaceable self-aligning sliding bearings includes a fan main shaft 1, a bearing seat 6, a plurality of sliding bearing blocks 2 and an oil bag 4. The fan main shaft 1 is provided with a journal 11. Figure 4 As shown, a spacer ring 13 is provided in the middle of the journal 11, and a bearing block placement groove 12 arranged along the circumference of the journal 11 is provided on both sides of the spacer ring 13; a plurality of spindle oil grooves 14 are provided on the spacer ring 13, and a plurality of oil groove outlet holes 15 are provided on both sides of the spindle oil groove 14; a plurality of sliding bearing blocks 2 are evenly distributed in the bearing block placement groove 12, and the outer end surface of the sliding bearing block 2 is shaped like the arc surface of the rolling bearing roller;

[0050] like Figure 5 As shown, a plurality of oil bags 4 are arranged at intervals from the sliding bearing block 2, such as Fig. 9 As shown, the oil bag 4 is provided with an oil scraper slot 42 inside, and an oil scraper 5 is installed in the oil scraper slot 42. The oil scraper 5 divides the oil bag 4 into two oil bag chambers 41. An oil bag cover plate 44 is provided on the upper part of the oil bag chamber 41. An oil bag oil inlet hole 43 is provided on one side of each oil bag chamber 41, and the oil bag oil inlet hole 43 corresponds to the position of the oil groove oil outlet hole 15 on one side of the spindle oil groove 14. A through oil scraper oil inlet hole 52 is provided at the lower part of the oil scraper 5. The middle part of the oil scraper oil inlet hole 52 is connected with an oil scraper oil outlet hole 53. The upper end of the oil scraper oil outlet hole 53 is located at the outer end surface of the oil scraper 5, and the outer end surface of the oil scraper 5 is adapted to the outer end surface of the sliding bearing block 2.

[0051] like Figure 1 , Figure 2As shown, the bearing seat 6 is installed outside the sliding bearing block 2, the inner wall of the bearing seat 6 is matched with the sliding bearing block 2 and the oil scraper 5, and an oil film is formed between the inner wall of the bearing seat 6 and the outer arc surface of the sliding bearing block 2 and the oil scraper 5; the bearing seat 6 is provided with an oil filling hole 61, the oil filling hole 61 is opened in the non-load-bearing area of ​​the bearing seat 6, and the oil filling hole 61 corresponds to the position of the spindle oil groove 14, and sealing members 7 are provided on both sides of the bearing seat 6 for sealing the sliding bearing;

[0052] In the present invention, the "rolling bearing outer ring" is designed to be integrated with the bearing seat 6, the bearing block placement groove 12 is shaped as a "rolling bearing inner ring" and integrated with the fan main shaft 1; the sliding bearing block 2 is shaped as a "rolling bearing rolling element". Compared with the spherical roller in the rolling bearing, in this solution, the sliding bearing block 2 with a spherical structure is fixed in the bearing block placement groove of the fan main shaft 1 and rotates with the fan main shaft 1; the oil bag 4 is shaped as a "rolling bearing cage". By shaped like a double-row spherical roller bearing, the sliding bearing can bear various loads on the fan main shaft like a rolling bearing.

[0053] The working curved surface of the sliding bearing block of the sliding bearing is shaped like the drum-shaped roller curved surface, and the center of the curved arc of the inner wall of the bearing seat 6 matched with the sliding bearing block 2 is at the center of the bearing. Therefore, the sliding bearing as a whole has the performance advantages of a double-row spherical roller bearing, that is, it mainly bears radial forces and also bears axial forces generated by wind. At the same time, due to changes in wind force and wind turbulence, it can also rotate normally when the main shaft bends and tilts to generate an overturning moment, and has good self-aligning performance.

[0054] In terms of the lubrication system, high-pressure lubricating oil is injected into the oil filling hole 61, and the lubricating oil flows into the main shaft oil groove 14, and enters the oil bag cavity 41 through the oil groove oil outlet hole 15 and the oil bag oil inlet hole 43 in turn, and then flows from the oil bag cavity 41 into the oil scraper oil inlet hole 52. When the oil scraper 5 rotates to the area below the horizontal level of the fan main shaft 1, that is, the load-bearing area, the lubricating oil flows out from the oil scraper oil outlet hole 53. When the oil scraper 5 rotates with the fan main shaft 1, the lubricating oil that flows out is evenly arranged on the working surface between the sliding bearing block 2 and the bearing seat 6, and a complete oil film is formed, so that lubrication between the sliding bearing block and the bearing seat can be achieved without a complicated lubrication system.

[0055] As a further preferred embodiment of this embodiment, the sliding bearing blocks 2 are symmetrically arranged in the bearing block placement grooves 12 on both sides, or the sliding bearing blocks 2 are staggeredly arranged in the bearing block placement grooves 12 on both sides.

[0056] like Fig. 9 As shown, a plurality of communication holes 51 are provided at the lower part of the oil scraper 5 , and the communication holes 51 are connected to the oil sac cavities 41 on both sides so that the lubricating oil in the two oil sac cavities 41 is evenly distributed.

[0057] As a further preference of this embodiment, the shaft neck 11, the steel back of the sliding bearing block, and the oil bag 4 are made of alloy steel with the same properties, and the working surface of the sliding bearing (the outer arc surface of the sliding bearing block 2 and the inner wall of the bearing seat 6) is made of steel back, alloy layer and coating, wherein the alloy layer meets the requirements of impact resistance and wear resistance, and the coating meets the initial running-in or frequent starting and stopping under low speed and heavy load conditions, and even restarting after long-term shutdown.

[0058] like Figure 4 As shown, a bearing pad groove 17 is provided on one side of the bearing block placement groove 12, and one side of the bearing pad groove 17 passes through the shaft neck 11, and a plurality of semi-threaded holes 16 are provided at the lower part of the bearing pad groove 17; a bearing pad 3 is installed inside the bearing pad groove 17, and the upper surface of the bearing pad 3 is flush with the bearing block placement groove 12, and the bearing pad 3 and the bearing block placement groove 12 jointly support the sliding bearing block 2; Figure 7 , Figure 8 As shown, the lower part of the bearing pad 3 is provided with a semi-threaded hole 2 31 corresponding to the semi-threaded hole 16, the semi-threaded hole 16 and the semi-threaded hole 2 31 constitute a complete threaded hole, and the semi-threaded hole 16 and the semi-threaded hole 2 31 are internally threadedly connected with screws for fixing the bearing pad 3 and the shaft neck 11; Figure 4 As shown, oil bag installation grooves 19 are arranged at intervals on the bearing block placement groove 12, and the oil bag 4 is installed in the oil bag installation groove 19.

[0059] In this embodiment, when the sliding bearing block 2 is abnormally worn, the seal 7 is removed, the sliding bearing block 2 to be replaced is rotated to the non-load-bearing area, and then the bearing pad 3 is removed and the sliding bearing block 2 is removed axially for maintenance or replacement.

[0060] like Figure 6 As shown, a plurality of first threaded holes 21 are provided on one side of the sliding bearing block 2, and the first threaded holes 21 are arranged in the axial direction of the sliding bearing block 2 for connecting with a disassembly tool to facilitate the axial removal of the sliding bearing block 2 from the bearing block placement groove 12.

[0061] Example 2

[0062] The difference from Example 1 is that Fig.10As shown, the bearing seat 6 is provided with a plurality of inspection openings 63, which correspond to the positions of the sliding bearing blocks 2. The inspection openings 63 are opened in the non-stress-bearing area of ​​the bearing seat 6, and an inspection window cover 62 is installed on the inspection openings 63. In the present embodiment, when the sliding bearing block 2 is abnormally worn, the inspection window cover 62 is opened, and the sliding bearing block 2 to be replaced is rotated to the inspection opening 63, and the sliding bearing block 2 is radially removed for maintenance or replacement. In the present embodiment, there is no need to remove the seal 7, and there is no need to arrange the bearing pads, so that the sliding bearing blocks 2 at different positions can be maintained or replaced at the same fixed position, and can be quickly replaced in the cabin, thereby reducing the maintenance cycle and replacement cost.

[0063] like Fig.14 , Fig.15 As shown, a plurality of second threaded holes 25 are provided on one side of the sliding bearing block 2, and the second threaded holes 25 are arranged at circumferential positions of the sliding bearing block 2 for connecting with a disassembly tool to radially dismantle the sliding bearing block 2.

[0064] like Fig.13 As shown, the bearing block placement groove 12 is provided with a plurality of positioning holes 18, such as Fig.15 As shown, the lower part of the sliding bearing block 2 is provided with a second positioning hole 22, and the positions of the first positioning hole 18 and the second positioning hole 22 correspond to each other. Fig.11 As shown, a positioning pin 23 is provided in the positioning hole 18 , and one end of the positioning pin 23 is interference fit with the positioning hole 18 , and the other end of the positioning pin 23 is transition fit with the positioning hole 22 , which is convenient for rapid positioning and installation of the sliding bearing block 2 .

[0065] like Fig.14 , Fig.15 As shown, the lower part of the sliding bearing block 2 is provided with an oil pocket pressure groove 24. Fig.16 As shown, oil bag wing plates 45 are provided on both sides of the oil bag 4, and the oil bag wing plates 45 are pressed into the oil bag pressing groove 24 of the sliding bearing block 2. A pin hole groove 46 for avoiding the positioning pin 23 is provided on one side of the oil bag wing plates 45, thereby ensuring the stability of the installation of the oil bag 4.

[0066] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the scope defined by the structure of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A fan main shaft system with double-row replaceable self-aligning sliding bearings, characterized in that: include: A fan main shaft, wherein the fan main shaft is provided with a journal, a spacer ring is provided in the middle of the journal, and a bearing block placement groove arranged along the circumference of the journal is provided on both sides of the spacer ring; a plurality of main shaft oil grooves are provided on the spacer ring, and a plurality of oil outlet holes are provided on both sides of the main shaft oil groove; A plurality of sliding bearing blocks are evenly distributed in the bearing block placement groove, and the outer end surface of the sliding bearing block is shaped like the arc surface of the roller in the rolling bearing; A plurality of oil bags are arranged at intervals with the sliding bearing block, an oil scraper slot is provided inside the oil bag, an oil scraper is installed in the oil scraper slot, the oil scraper divides the oil bag into two oil bag chambers, an oil bag cover plate is provided at the upper part of the oil bag chamber, an oil bag oil inlet hole is provided on one side of each oil bag chamber, and the oil bag oil inlet hole corresponds to the position of the oil tank oil outlet hole on one side of the main shaft oil tank, a through oil scraper oil inlet hole is provided at the lower part of the oil scraper, the middle part of the oil scraper oil inlet hole is connected with an oil scraper oil outlet hole, the upper end of the oil scraper oil outlet hole is located at the outer end face of the oil scraper, and the outer end face of the oil scraper is matched with the outer end face of the sliding bearing block; The bearing seat is installed on the outside of the sliding bearing block, the inner wall of the bearing seat is matched with the sliding bearing block and the oil scraper, and an oil film is formed between the inner wall of the bearing seat and the outer arc surface of the sliding bearing block and the oil scraper; the bearing seat is provided with an oil filling hole, the oil filling hole is opened in the non-load-bearing area of ​​the bearing seat, the oil filling hole corresponds to the position of the main shaft oil groove, and sealing members are provided on both sides of the bearing seat for sealing the sliding bearing.

2. The fan main shaft system with double-row replaceable self-aligning sliding bearings integrated with the fan main shaft according to claim 1, characterized in that: The sliding bearing blocks are symmetrically arranged in the bearing block placement grooves on both sides, or the sliding bearing blocks are staggeredly arranged in the bearing block placement grooves on both sides.

3. The fan main shaft system with double-row replaceable self-aligning sliding bearings integrated therein according to claim 1, characterized in that: The lower part of the oil scraper is provided with a plurality of communicating holes, and the communicating holes are connected with the oil bag cavities on both sides so that the lubricating oil in the two oil bag cavities is evenly distributed.

4. The fan main shaft system with double-row replaceable self-aligning sliding bearings integrated therein according to claim 1, characterized in that: The journal, the steel back of the sliding bearing block and the oil bag are made of alloy steel with the same properties, and the working surface material of the sliding bearing is made of steel back, alloy layer and coating.

5. A fan main shaft system with double-row replaceable self-aligning sliding bearings according to any one of claims 1 to 4, characterized in that: A bearing pad groove is provided on one side of the bearing block placement groove, and one side of the bearing pad groove passes through the shaft neck, and a plurality of semi-threaded holes are provided at the lower part of the bearing pad groove; a bearing pad is installed inside the bearing pad groove, and the upper surface of the bearing pad is flush with the bearing block placement groove, and the bearing pad and the bearing block placement groove jointly support the sliding bearing block; a semi-threaded hole two corresponding to the semi-threaded hole one is provided at the lower part of the bearing pad, and the semi-threaded hole one and the semi-threaded hole two constitute a complete threaded hole, and the semi-threaded hole one and the semi-threaded hole two are internally threadedly connected with screws for fixing the bearing pad to the shaft neck; oil bag mounting grooves are arranged at intervals on the bearing block placement groove, and the oil bag is installed in the oil bag mounting groove.

6. The fan main shaft system with double-row replaceable self-aligning sliding bearings integrated therein according to claim 5, characterized in that: A plurality of first threaded holes are provided on one side of the sliding bearing block, and the first threaded holes are arranged in the axial direction of the sliding bearing block for connecting with a disassembly tool.

7. A fan main shaft system with double-row replaceable self-aligning sliding bearings according to any one of claims 1 to 4, characterized in that: The bearing seat is provided with a plurality of inspection openings, which correspond to the positions of the sliding bearing blocks. The inspection openings are opened in the non-stress bearing area of ​​the bearing seat, and inspection window covers are installed on the inspection openings.

8. The fan main shaft system with double-row replaceable self-aligning sliding bearings integrated therein according to claim 7, characterized in that: A plurality of second threaded holes are provided on one side of the sliding bearing block, and the second threaded holes are arranged at circumferential positions of the sliding bearing block for connection with a disassembly tool.

9. The fan main shaft system with double-row replaceable self-aligning sliding bearings integrated therein according to claim 7, characterized in that: The bearing block placement groove is provided with a plurality of positioning holes 1, and the lower part of the sliding bearing block is provided with positioning hole 2, the positions of positioning hole 1 and positioning hole 2 correspond to each other, a positioning pin is provided in positioning hole 1, and one end of the positioning pin is interference fit with positioning hole 1, and the other end of the positioning pin is transition fit with positioning hole 2.

10. The fan main shaft system with double-row replaceable self-aligning sliding bearings integrated therein according to claim 7, characterized in that: An oil bag pressure groove is provided at the lower part of the sliding bearing block, and oil bag wings are provided on both sides of the oil bag. The oil bag wings are pressed into the oil bag pressure groove of the sliding bearing block, and a pin hole groove for avoiding the positioning pin is provided on one side of the oil bag wing.

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