Main shaft bearing lubricating system of overhang roll flour mill

Abstract

The invention belongs to the technical field of overhang roll flour mill manufacturing, and particularly relates to an overhang roll flour mill main shaft bearing lubricating system which comprises a gear box, a vertical bearing seat, a lower end cover, a main shaft, a scraper knife rest, a lower bearing and an upper bearing, a center hole is formed in the main shaft, and a middle pipe is arranged at the lower end of the main shaft. The middle pipe is rotatably connected in a sealing ring I in the lower end cover, and an oil outlet is formed in the lower end cover; a sealing ring II is sleeved on the main shaft; a plurality of radial holes communicated with the central hole are formed in the main shaft above the sealing ring II; a sealing assembly is arranged below the upper bearing, a communicating hole is formed in the sealing assembly, and a backflow hole is formed in the vertical bearing seat; lubricating oil flows back to an external oil supply system sequentially through the external oil supply system, the middle pipe, the center hole, the radial hole, the upper bearing, the communicating hole, the backflow hole, the lower bearing and the oil outlet. The invention has the advantages of good lubricating effect and good sealing effect of the main shaft bearing.

Description

Technical Field

[0001] The invention belongs to the technical field of suspension roller mill manufacturing, and in particular relates to a main shaft bearing lubrication system for a suspension roller mill. Background Art

[0002] Suspension roller mills are widely used for grinding mineral products in the metallurgical, building materials, chemical, and mining industries, often under harsh operating conditions. Due to these harsh operating conditions and sealing requirements, the upper spindle bearings are currently lubricated with grease. This lubrication method has the following drawbacks: the dusty filling environment easily contaminates the grease; each grease filling requires cleaning the machine, which is labor-intensive; old grease is difficult to remove, and new grease cannot fully cover the friction surface, leading to contamination accumulation; friction heat cannot be removed, and high temperatures can easily cause grease aging; and the bearing's service life is reduced.

[0003] There are also technical solutions in the prior art for lubricating the main shaft bearings using thin oil lubrication. For example, Chinese invention patent application No. 202510094167.7 discloses a thin oil lubrication system for the main shaft bearings with an oil pump for a suspended roller mill. The main shaft is supported by an upper bearing and a lower bearing; the upper bearing is mounted on a bearing seat, and the bearing seat and the lower bearing are mounted on a gearbox; an oil pump pan is mounted on the main shaft, and a spiral groove is provided on the outer circumferential surface of the oil pump pan; an axial bore is provided at the rotation center of the main shaft, and the depth of the axial bore is higher than the radial centerline of the upper bearing; a transverse hole is drilled from the outer surface of the main shaft toward the rotation center, one end of the transverse hole is interconnected with the axial bore, and the other end of the transverse hole faces the upper bearing, and the centerline of the transverse hole is higher than the radial centerline of the upper bearing; a main shaft lower end cover is provided at the lower portion of the main shaft, and an inner chamber is provided in the main shaft lower end cover, and the axial bore is connected to the inner chamber; the spiral groove, the lower bearing, the inner chamber, the axial bore, the transverse hole, and the upper bearing constitute a lubricating oil circuit.

[0004] However, the above technical solution has the following technical problems: the oil filling hole on the lower end cover is connected to the oil outlet hole on the gear box, making it difficult to transport the lubricating oil to the upper bearing through the axial drilling hole of the main shaft, resulting in limited lubrication effect on the main shaft bearing; in addition, the sealing effect at the upper bearing is limited, making it difficult to adapt to harsh working conditions, especially prone to leakage of lubricating oil in the lubrication circuit and entry of external dust. Summary of the Invention

[0005] In order to solve the technical problems existing in the prior art, the present application provides a spindle bearing lubrication system for a suspended roller mill with good spindle bearing lubrication effect and good sealing effect.

[0006] To achieve the above object, the present invention provides the following technical solutions: A suspension roller mill main shaft bearing lubrication system comprises a gear box, a vertical bearing seat and a lower end cover respectively arranged at the upper and lower openings of the gear box, a main shaft arranged in the vertical bearing seat, a scraper frame fixedly connected to the main shaft, a lower bearing arranged at the lower part of the main shaft, and an upper bearing sleeved on the upper part of the vertical bearing seat, wherein a center hole is opened in the main shaft along its axial direction, a middle pipe is fixedly connected to the lower end of the main shaft, the middle pipe is rotatably connected to the sealing ring I in the lower end cover, and an oil outlet is opened on the lower end cover; the main shaft sleeved on the upper part of the vertical bearing seat A sealing ring II is provided, and a plurality of radial holes connected to the center hole are opened on the main shaft above the sealing ring II, and an upper bearing is provided on the vertical bearing seat below the radial hole; a sealing assembly is provided below the upper bearing, a connecting hole is provided on the sealing assembly, and a return hole is opened on the vertical bearing seat; the external oil supply system is respectively connected to the middle pipe and the oil outlet, and the lubricating oil is returned to the external oil supply system through the external oil supply system, the middle pipe, the center hole, the radial hole, the upper bearing, the connecting hole, the return hole, the gap between the main shaft and the vertical bearing seat, the lower bearing, and the oil outlet.

[0007] Preferably, the sealing assembly includes a sealing plate I embedded in the scraper frame and a sealing plate II fixedly sleeved on the vertical bearing seat; a guide flow hole is provided in the middle of the sealing plate I, a sealing ring III is embedded in its outer circumference, and a special-shaped groove I is provided on its lower end surface; a connecting through hole is provided in the middle of the sealing plate II, a sealing ring IV is embedded on the inner wall of the connecting through hole, a special-shaped groove II is provided on the upper end surface of the sealing plate II, and a plurality of connecting holes are provided on the groove wall of the special-shaped groove II; the special-shaped groove I and the special-shaped groove II are arranged opposite to each other, and the lubricating oil enters the reflux hole through the gap between the inner wall of the guide flow hole and the groove wall of the special-shaped groove II and the connecting hole.

[0008] Preferably, the upper end surface of the sealing disk 1 is a conical surface structure with a high outer side and a low inner side.

[0009] Preferably, a sealing ring V is embedded in the inner end surface of the blade frame below the sealing assembly.

[0010] Preferably, the lower end cover includes an end cover body fixedly connected to the gear box, a transition cylinder embedded in the end cover body, a sealing end cover and an oil inlet flange fixedly connected at the upper and lower openings of the transition cylinder respectively; the middle tube can be rotatably inserted in the sealing end cover, an oil inlet is provided on the oil inlet flange, the oil outlet is provided on the end cover body, and the oil inlet is connected to an external oil supply system.

[0011] Preferably, the sealing ring I is embedded in the transition cylinder below the sealing end cover, and the middle tube is rotatably inserted in the sealing ring I.

[0012] Preferably, a sealing ring disassembly hole is provided on the sealing end cover above the sealing ring I.

[0013] Preferably, a connecting flange is provided at the lower portion of the transition cylinder, a flange stop is provided on the end cover body, the connecting flange is embedded in the flange stop, and the oil inlet flange is fixedly connected to the connecting flange.

[0014] Preferably, the middle tube includes a middle tube body and an outer ring arranged at the upper end of the middle tube body, an outer ring stop is opened on the lower end face of the main shaft, the outer ring is fixedly embedded in the outer ring stop, and the middle tube body can be rotatably inserted in the sealing end cover.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention forms a circulation system for lubricating the main shaft bearings of a suspended roller mill, comprising an external oil supply system, a central pipe, a central hole of the main shaft, radial holes of the main shaft, an upper bearing, a connecting hole of a sealing assembly, a return hole, an oil return gap, a lower bearing, and an oil outlet. Compared to existing grease-based lubrication solutions, this system addresses several technical issues, including the dusty filling environment, which easily contaminates the grease; the need to clean the machine each time grease is added, which is labor-intensive; the difficulty in draining out old grease, preventing new grease from fully covering the friction surface, which can lead to contamination accumulation; the inability to remove frictional heat, which can easily cause grease aging due to high temperatures; and a reduced bearing service life. Furthermore, by separating the oil inlet and outlet, the oil inlet and return oil circulate in a one-way manner. Compared to existing thin oil lubrication systems, this system improves the stability and quantity of lubricating oil entering the upper bearing through the central hole and radial holes of the main shaft, thereby enhancing the lubrication efficiency of the upper bearing. Furthermore, when combined with existing gearboxes and bevel gear transmissions, the present invention can also lubricate structures requiring lubrication, such as bevel gear transmissions.

[0016] In addition, the lubricating oil reaches the upper bearing through the center hole of the main shaft, avoiding harsh working conditions; the circuitous maze sealing structure composed of sealing disk I, sealing disk II, sealing ring III, and sealing ring IV prevents the leakage of lubricating oil in the circuit and the entry of external dust.

[0017] The present invention provides a transition oil chamber enclosed by a transition cylinder, a sealing end cover, and an oil inlet flange, so that the connection mode between the external oil supply system and the center hole of the main shaft is converted from a dynamic seal to a static seal, thereby avoiding the risk of lubricating oil leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 for Figure 1 A schematic diagram of the enlarged structure.

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the sealing disk 1 of the present invention.

[0021] Figure 4 It is a schematic cross-sectional structural diagram of the sealing disk 1 of the present invention.

[0022] Figure 5 It is a schematic diagram of the cross-sectional structure of the sealing disk II of the present invention.

[0023] Figure 6 It is a schematic cross-sectional structural diagram of the sealing disk II of the present invention.

[0024] Figure 7 Schematic diagram of the connection structure between the sealing disk I and the sealing disk II of the present invention.

[0025] Figure 8 for Figure 1 Schematic diagram of the enlarged structure at point B.

[0026] Figure 9 It is a schematic cross-sectional structural diagram of the middle tube of the present invention.

[0027] Figure 10 It is a schematic cross-sectional structural diagram of the transition cylinder, sealing end cover and sealing ring I of the present invention.

[0028] Figure 11 It is a schematic cross-sectional structural diagram of the oil inlet flange of the present invention.

[0029] In the figure: 11, gearbox, 12, vertical bearing seat, 121, bearing seat stop 1, 122, sealing ring II, 123, oil return gap, 124, bearing seat stop 2, 125, return hole, 13, main shaft, 131, center hole, 132, radial hole, 133, outer ring stop, 14, hanging roller frame, 15, scraper frame, 151, scraper frame stop 1, 152, scraper frame stop 2, 153, scraper frame stop 3, 16, lower bearing, 161, lower bearing 1, 162, fixing ring, 163, lower bearing 2, 17, upper bearing, 2. Lower end cover, 21. End cover body, 211. End cover through hole, 212. Flange stopper, 213. Oil outlet, 22. Transition cylinder, 221. Connecting flange, 23. Sealing end cover, 231. Rotating through hole, 232. Sealing ring removal hole, 24. Oil inlet flange, 241. Oil inlet, 25. Sealing ring I, 3. Middle tube, 31. Middle tube body, 32. Outer ring, 4. Sealing disk I, 41. Diversion hole, 42. Groove 1, 43. Sealing ring III, 44. Special-shaped groove I, 441. Rectangular ring groove 1, 442. Special-shaped ring groove 1, 45. Conical surface structure, 46. Reflux channel, 47. Expansion chamber, 48. Sealing gap, 5. Sealing disk II, 51. Connecting through hole, 52. Groove II, 53. Sealing ring IV, 54. Special-shaped groove II, 541. Rectangular ring groove II, 542. Special-shaped ring groove II, 55. Boss, 56. Connecting hole, 57. Limiting ring, 58. Sealing ring V. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are also within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention. Example

[0032] See attached Figure 1 、 2 As shown in Figures 8 and 9, a suspension roller mill main shaft bearing lubrication system comprises a gearbox 11, a vertical bearing seat 12 and a lower end cover 2 fixedly mounted at the upper and lower openings of the gearbox 11 by bolts, a main shaft 13 vertically arranged in the vertical bearing seat 12, a suspension roller frame 14 fixedly sleeved on the upper end of the main shaft 13, a scraper frame 15 fixedly connected to the suspension roller frame 14 by bolts, a lower bearing 16 arranged at the lower part of the main shaft 13, and an upper bearing 17 sleeved on the upper part of the vertical bearing seat 12. The main shaft 13 is inserted into the vertical bearing seat 12, and the scraper frame 15 is sleeved on the vertical bearing seat 12 and can rotate relative to the vertical bearing seat 12 under the drive of the main shaft 13.

[0033] A center hole 131 is defined axially within the main shaft 13. A bearing seat stop 121 is defined at the upper end of the vertical bearing seat 12. A sealing ring II 122 is embedded within the bearing seat stop 121 and fits over the outer circumference of the main shaft 13. An oil return gap 123 is defined between the outer circumference of the main shaft 13 and the inner circumference of the vertical bearing seat 12. A plurality of radial holes 132, interconnecting with the center hole 131, are defined radially within the main shaft 13 above the sealing ring II 122. For example, three radial holes 132 may be evenly distributed. An upper bearing 17 is disposed below the radial holes 132 on the vertical bearing seat 12 and the blade frame 15. The blade frame 15 is rotatably connected to the vertical bearing seat 12 via the upper bearing 17.

[0034] See also Figure 8 、 9 As shown in Figures 10 and 11, the lower end of the main shaft 13 is fixedly connected to the middle tube 3. The middle tube 3 is coaxially arranged and connected to the center hole 131. When the main shaft 13 rotates, it can drive the middle tube 3 to rotate synchronously. As shown in Figure 9, to facilitate the fixed installation of the middle tube 3 on the main shaft 13, the middle tube 3 includes a hollow middle tube body 31 and an outer ring 32 integrally formed with the upper end of the middle tube body 31. The outer ring stop 133 is defined on the lower end surface of the main shaft 13. The outer ring 32 is embedded in the outer ring stop 133 and secured by bolts.

[0035] In another embodiment, the central tube body 31 of the central tube 3 is rotatably embedded in the existing lower end cap 2 and extends below the lower end cap 2. The outer circumference of the central tube 3 and the lower end cap 2 are sealed by a sealing structure. The existing external oil supply system is connected to the lower portion of the central tube 3 via the existing rotating sealing mechanism. The external oil supply system delivers lubricating oil through the inner cavity of the rotating central tube 3 into the central hole 131. However, this structure is a dynamic seal and poses a risk of lubricating oil leakage.

[0036] To this end, in this embodiment, the lower end cover 2 includes an end cover body 21 fixedly installed at the lower opening of the gear box 11 by bolts, an end cover through hole 211 is opened in the middle of the end cover body 21, a transition cylinder 22 is embedded in the end cover through hole 211, and a sealing end cover 23 and an oil inlet flange 24 are fixedly connected to the upper and lower openings of the transition cylinder 22 respectively.

[0037] See also Figure 10 As shown, the sealing end cover 23 can be integrally formed with the transition barrel 22. To facilitate the connection between the transition barrel 22 and the oil inlet flange 24, a connecting flange 221 is integrally formed with the lower portion of the transition barrel 22. The oil inlet flange 24 is fixedly mounted to the connecting flange 221 by bolts. Furthermore, to position the transition barrel 22 on the end cover body 21 for easy installation thereon, a flange stop 212 is formed on the lower end surface of the end cover body 21. The connecting flange 221 is embedded in the flange stop 212. The oil inlet flange 24 and the connecting flange 221 are fixedly connected to the end cover body 21 by bolts.

[0038] The sealing end cap 23 is provided with a rotational through-hole 231, into which the middle tube body 31 is rotatably inserted. To seal the interior of the transition barrel 22, a sealing ring 125 is embedded within the transition barrel 22 below the sealing end cap 23, with the middle tube body 31 rotatably inserted within the sealing ring 125. To facilitate removal of the sealing ring 125, a sealing ring removal hole 232 is provided in the sealing end cap 23 above the sealing ring 125. To remove the sealing ring 125, a tool is inserted into the sealing ring removal hole 232 and pressure is applied to the sealing ring 125 to cause it to fall from the interior of the transition barrel 22.

[0039] See also Figure 11 As shown, an oil inlet 241 is provided on the oil inlet flange 24 , and an oil outlet 213 is provided on the end cover body 21 . The oil inlet 241 is connected to an external oil supply system.

[0040] Through the above structure, the inner cavity of the transition cylinder 22 serves as a transition oil cavity, so that the dynamic seal between the middle tube 3 and the lower end cover 2 in other embodiments is converted into a static seal between the external oil supply system and the transition oil cavity, thereby avoiding the risk of lubricating oil leakage; In addition, the lower bearing 16 may include a lower bearing 161 fixedly embedded in the upper end of the end cover body 21, a fixing ring 162 clamped on the inner ring of the lower bearing 161 and sleeved on the lower part of the main shaft 13, and a lower bearing 2 163 fixedly sleeved on the main shaft 13 above the fixing ring 162 and embedded in the inner circumference of the scraper frame 15, wherein the lower bearing 161 can be a backlash bearing.

[0041] See also Figure 2 、 3 As shown in , 4, 5, 6, and 7, a sealing assembly is provided below the upper bearing 17, a connecting hole 56 is provided on the sealing assembly, and a plurality of reflux holes 125 are opened on the vertical bearing seat 12. The lubricating oil can enter the reflux hole 125 through the radial hole 132, the upper bearing 17, and the connecting hole 56.

[0042] Specifically, blade frame 15 below upper bearing 17 is provided with blade frame stop 151 and blade frame stop 2 152. Blade frame stop 151 has a larger outer diameter than blade frame stop 2 152. Bearing frame stop 2 124 is provided on the outer circumference of vertical bearing seat 12 between the horizontal end surfaces of blade frame stop 151 and blade frame stop 2 152. The sealing assembly includes a sealing disc I4 embedded in blade frame 15 and a sealing disc II5 fixedly mounted on vertical bearing seat 15.

[0043] See also Figure 3 、 4As shown, the sealing disk I4 is circular as a whole and has a guide flow hole 41 in the middle thereof, a groove 42 is provided on the outer circumference of the sealing disk I4, a sealing ring III43 is embedded in the groove 42, and a special-shaped groove I44 is provided on the lower end surface of the sealing disk I4. The special-shaped groove I44 includes a rectangular annular groove 441 provided on the lower end surface of the sealing disk I4 and a special-shaped annular groove 442 provided on the inner side wall of the rectangular annular groove 441 and extending toward the inner side of the sealing disk I4.

[0044] See also Figure 5 、 6 As shown, the sealing disc II5 is generally circular and has a boss 55 extending upward from the middle of its upper end surface. A connecting through-hole 51 is defined in the middle of this boss 55. The boss 55, which defines the connecting through-hole 51, is annular. A groove II 52 is defined on the inner circumference of the connecting through-hole 51, and a sealing ring IV 53 is embedded within this groove II 52. A special-shaped groove II 54 is defined on the upper end surface of the sealing disc II5 outside of the boss 55. This special-shaped groove II 54 comprises a rectangular annular groove II 541 defined on the upper end surface of the sealing disc II5 and a special-shaped annular groove II 542 defined on the outer wall of the rectangular annular groove II 541 and extending outward from the sealing disc II5.

[0045] A plurality of communication holes 56 are formed in the groove wall of the special-shaped groove II 54, i.e., on the vertical end surface of the boss 55, extending through the boss 55. In this embodiment, the communication holes 56 are notches extending downward from the upper end surface of the boss 55 to facilitate the flow of lubricating oil through the communication holes 56 into the return hole 125 in the vertical bearing seat 12. In this embodiment, four communication holes 56 are provided, and three return holes 125 are provided. Alternatively, a one-to-one correspondence or other number of communication holes 56 can be provided, as long as the communication holes 56 are connected to the return hole 125 when the sealing disk II is installed in the vertical bearing seat 12.

[0046] When installing the sealing disc I4 and sealing disc II5, please refer to Figure 2 and 7 As shown, the sealing disc II5 is sleeved onto the vertical bearing seat 12 and abuts the second bearing seat stop 124. The boss 55 of the sealing disc II5 abuts the inner ring of the upper bearing 17, thereby fixing the sealing disc II5 to the vertical bearing seat 12. The sealing ring IV53 abuts the outer circumference of the vertical bearing seat 12, and the sealing disc II5 is inserted above the second blade frame stop 152. It should be noted that when the sealing disc II5 is installed on the vertical bearing seat 12, it is necessary to ensure that at least two return holes 125 are connected to the communication hole 56.

[0047] The sealing disc I4 is placed over the sealing disc II5 outside the boss 55, with the lower end of the sealing disc I4 outside the profiled groove I44 abutting the scraper frame stop 151, and the sealing ring III43 abutting the inner circumference of the scraper frame 15. A gap is provided between the upper end of the sealing disc I4 and the lower end of the upper bearing 17. To further enhance the smooth flow of lubricating oil from the sealing disc I4 to the connecting hole 56, the upper end of the sealing disc I4 is formed into a conical surface structure 45 with a high outer surface and a low inner surface. Furthermore, a recirculation channel 46 for lubricating oil is provided between the inner circumference of the guide hole 41 of the sealing disc I4 and the outer circumference of the boss 55. The lubricating oil flows through the recirculation channel 46 and the connecting hole 56 and enters the recirculation hole 125. The special-shaped groove I44 and the special-shaped groove II54 are arranged opposite to each other to enclose an expansion chamber 47. A sealing gap 48 is left on the opposite end faces of the sealing disk I4 and the sealing disk II5. The expansion chamber 47 and the sealing gap 48 form a circuitous sealing structure, thereby preventing the lubricating oil from leaking through the sealing disk I4 and the sealing disk II5 to the outside of the scraper frame 15.

[0048] Furthermore, in order to further improve the sealing effect, a scraper frame stop three 153 is provided on the inner end face of the scraper frame 15 below the sealing assembly, and a limiting ring 57 is clamped on the scraper frame stop three 153. A sealing ring V58 is embedded in the inner end face of the scraper frame 15 at the upper end of the limiting ring 57, and the sealing ring V58 is sleeved on the outer circumference of the vertical bearing seat 12.

[0049] The working principle and process of this embodiment are as follows: The outlet of the external oil supply system is connected to the oil inlet 241, and the inlet of the external oil supply system is connected to the oil outlet 213; the lubricating oil is pressurized by the external oil supply system and enters the oil inlet 241, the inner cavity of the transition cylinder 22, the center hole 131 of the inner cavity of the middle tube body 31 of the main shaft 13 through its outlet and flows out of the main shaft 13 from the radial hole 132; the lubricating oil flowing out of the main shaft 13 enters the upper part of the gear box 11 through the upper bearing 17, the reflux channel 46, the connecting hole 56, the reflux hole 125, and the return oil gap 123, and then flows back to the external oil supply system through the lower bearing 2 163, the lower bearing 1 161, the oil outlet 213, and the inlet of the external oil supply system, thereby forming a closed lubricating oil circulation system.

[0050] It should be noted that the structures not described in the specification of the present invention are prior art and will not be described in detail here.

[0051] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A suspension roller mill main shaft bearing lubrication system, comprising a gearbox, a vertical bearing seat and a lower end cover respectively disposed at the upper and lower openings of the gearbox, a main shaft disposed within the vertical bearing seat, a scraper frame fixedly connected to the main shaft, a lower bearing disposed below the main shaft, and an upper bearing sleeved above the vertical bearing seat, characterized in that: A central hole is opened in the main shaft along its axial direction, and a middle tube is fixedly connected to the lower end of the main shaft. The middle tube is rotatably connected to the sealing ring I in the lower end cover, and an oil outlet is opened on the lower end cover; A sealing ring II is sleeved on the main shaft in the upper part of the vertical bearing seat, a plurality of radial holes connected to the central hole are opened on the main shaft above the sealing ring II, and an upper bearing is arranged on the vertical bearing seat below the radial holes; A sealing assembly is provided below the upper bearing, a communicating hole is provided on the sealing assembly, and a reflux hole is provided on the vertical bearing seat; The external oil supply system is connected to the middle pipe and the oil outlet respectively, and the lubricating oil flows back to the external oil supply system through the external oil supply system, the middle pipe, the center hole, the radial hole, the upper bearing, the connecting hole, the return hole, the gap between the main shaft and the vertical bearing seat, the lower bearing, and the oil outlet in sequence.

2. The suspension roller mill main shaft bearing lubrication system according to claim 1, characterized in that: The sealing assembly includes a sealing disc I embedded in the scraper frame and a sealing disc II fixedly sleeved on the vertical bearing seat; A guide hole is provided in the middle of the sealing disc I, a sealing ring III is embedded in its outer circumference, and a special-shaped groove I is provided on its lower end surface; A connecting through hole is provided in the middle of the sealing disc II, a sealing ring IV is embedded on the inner wall of the connecting through hole, a special-shaped groove II is provided on the upper end surface of the sealing disc II, and a plurality of connecting holes are provided on the groove wall of the special-shaped groove II; The special-shaped groove I and the special-shaped groove II are arranged opposite to each other, and the lubricating oil enters the reflux hole through the gap between the inner wall of the guide hole and the groove wall of the special-shaped groove II and the connecting hole.

3. The suspension roller mill main shaft bearing lubrication system according to claim 2, characterized in that: The upper end surface of the sealing disk 1 is a conical surface structure with a high outer side and a low inner side.

4. The suspension roller mill main shaft bearing lubrication system according to claim 1, characterized in that: A sealing ring V is embedded in the inner end surface of the blade frame below the sealing assembly.

5. The suspension roller mill main shaft bearing lubrication system according to claim 1, characterized in that: The lower end cover includes an end cover body fixedly connected to the gear box, a transition cylinder embedded in the end cover body, a sealing end cover and an oil inlet flange fixedly connected at the upper and lower openings of the transition cylinder respectively; the middle pipe can be rotatably inserted in the sealing end cover, an oil inlet is provided on the oil inlet flange, the oil outlet is provided on the end cover body, and the oil inlet is connected to the external oil supply system.

6. The suspension roller mill main shaft bearing lubrication system according to claim 5, characterized in that: The sealing ring I is embedded in the transition cylinder below the sealing end cover, and the middle tube is rotatably inserted in the sealing ring I.

7. The suspension roller mill main shaft bearing lubrication system according to claim 6, characterized in that: A sealing ring disassembly hole is provided on the sealing end cover above the sealing ring 1.

8. The suspension roller mill main shaft bearing lubrication system according to claim 5, characterized in that: A connecting flange is provided at the lower portion of the transition cylinder, a flange stop is provided on the end cover body, the connecting flange is embedded in the flange stop, and the oil inlet flange is fixedly connected to the connecting flange.

9. The suspension roller mill main shaft bearing lubrication system according to claim 5, characterized in that: The middle tube includes a middle tube body and an outer ring arranged at the upper end of the middle tube body. An outer ring stop is opened on the lower end surface of the main shaft. The outer ring is fixedly embedded in the outer ring stop. The middle tube body can be rotatably inserted in the sealing end cover.

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