Sealing seat of rotating shaft, sealing assembly of thin oil lubrication rotating shaft, rotating shaft lubrication assembly and vibration exciter comprising rotating shaft lubrication assembly

Abstract

The utility model belongs to the field of mining mechanical equipment, and particularly relates to a sealing seat of a rotating shaft, a sealing assembly of a thin oil lubrication rotating shaft, a rotating shaft lubrication assembly and a vibration exciter comprising the rotating shaft lubrication assembly, in particular to the sealing seat of the rotating shaft, the sealing assembly of the rotating shaft, the rotating shaft lubrication assembly and the vibration exciter comprising the rotating shaft lubrication assembly. The sealing seat is provided with a first-stage seal formed by a curved-surface vortex blocking groove, a second-stage seal used for nesting a flexible sealing piece and a through groove used for forming a labyrinth seal, the sealing seat with a three-stage sealing structure forms the sealing assembly, and the rotating shaft lubricating assembly and the vibration exciter are integrated with the assembly, so that the sealing performance can be remarkably improved; and the service life of the vibration exciter is prolonged.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of mining machinery equipment, and particularly relates to a vibration exciter of a coal washing vibrating screen, and more particularly to a sealing seat of a rotating shaft, a sealing assembly of a thin-oil lubricated rotating shaft, a rotating shaft lubricating assembly and a vibration exciter comprising the rotating shaft lubricating assembly. BACKGROUND

[0002] The vibration exciter for the vibrating screen is a core component of the vibrating screen, and is mainly used to generate a periodic exciting force to make the screen body vibrate, so as to realize the screening, grading or conveying of materials. It is usually composed of a motor, an eccentric block (or an eccentric shaft) and a transmission mechanism. The motor drives the eccentric block to rotate at a high speed to generate a centrifugal force. This force is transmitted to the screen body to form a regular vibration track. The design of the vibration exciter directly affects the amplitude, frequency and screening efficiency of the vibrating screen. Commonly used vibration exciters include single-shaft vibration exciters and double-shaft vibration exciters. The single-shaft vibration exciter has a simple structure and is suitable for small-scale screen machines. The double-shaft vibration exciter can generate more complex vibration tracks and is suitable for large-scale or high-performance equipment. During installation, the vibration exciter is usually fixed on the beam of the screen body. By adjusting the mass or angle of the eccentric block, the size and direction of the vibration force can be changed to adapt to different materials and screening requirements. In general, the vibration exciter is like the "heart" of the vibrating screen, and its performance directly determines the screening effect and the service life of the equipment.

[0003] The long shaft and the short shaft of the vibration exciter rotate synchronously through two helical gears with the same number of teeth and modulus. The lubrication mode of the gears is thin-oil lubrication. According to different use scenarios, the sealing of the thin-oil lubrication equipment usually adopts floating oil seal type mechanical sealing, skeleton oil seal, Stator seal, Gley, etc. Compared with other gear devices at the same speed, the gears used in the vibration exciter are larger, have faster self-heat dissipation, and have lower temperature rise caused by gear meshing friction. The temperature rise of the vibration exciter is mainly caused by the temperature rise of the bearing. The high temperature rise of the bearing is mainly caused by the periodic change of the inertial force generated by the rotation of the eccentric block. Since the vibration exciter is used in vibrating equipment, it is not suitable to set up a heat dissipation device to reduce the temperature of the vibration exciter by reducing the oil temperature. The heat dissipation of the vibration exciter is mainly realized by the heat dissipation of the box body itself. Moreover, the amount of oil added in the vibration exciter is small, and the vibration exciter is also equipped with an air filter. The pressure in the box body is not very high. CONTENT OF THE INVENTION

[0004] According to the content described in the background, the technical problem to be solved by the present application is to provide a sealing seat and a sealing assembly, to improve the sealing performance and prolong the service life of the vibration exciter.

[0005] Technical solution: In order to solve the above technical problems, the present application provides a new technical solution,

[0006] A sealing seat for a rotating shaft includes: a connecting portion and a main body. The connecting portion is used to connect to a base. As a sealing seat for the rotating shaft, its basic structure is annular. The connecting portion is a flange seat disposed at the outer edge, and the main body is a sealing functional structure disposed near the inner edge. The through hole in the middle is a through hole for the rotating shaft. The main body includes:

[0007] The primary sealing structure is located on the inner side, and the secondary and / or tertiary sealing structures are located on the outer side, where the outer side and the inner side are relative to being closer to or further away from the lubrication chamber.

[0008] The primary sealing structure is an eddy current obstruction groove; when the shaft rotates, centrifugal force is generated, causing the oil to diffuse outward. The eddy current obstruction groove guides the oil back through a planned outward diffusion path, which can effectively block most of the oil from diffusing outward and play the role of primary sealing.

[0009] The secondary sealing structure is at least one mounting groove for filling or installing a flexible seal; the flexible seal is nested with the shaft or other seals and slides relative to each other with a very small gap, effectively preventing the overflow of lubricating fluid;

[0010] The three-stage sealing structure consists of at least one through groove arranged radially around the perimeter. This through groove engages with protrusions on the sealing baffle to form a labyrinth seal, thus achieving a three-stage sealing effect.

[0011] The sealing seat can provide a three-stage seal for the lubricant, which greatly improves the sealing performance.

[0012] Furthermore, the eddy current deflection groove is opened near the outer edge of the main body or near the connecting part. The cross-sectional structure of the eddy current deflection groove is that there is at least one straight path and one curved path. Taking the direction of lubricant flow as the direction, the starting end of the straight path is close to the lubrication chamber. The straight path starts from the inner edge of the connecting part, extends outward and deviates towards the center of the rotating shaft. That is, a circumferential outward slope is made on the part of the sealing seat near the lubrication chamber.

[0013] Its end is tangent to the beginning of the curved path. Taking the horizontal direction as a reference, the tangent angle at the end of the curved path is smaller than the angle of the straight path. That is, the starting point of the circular groove formed by the curved path is tangent to the inclined plane, and the end bends back. The angle of the return line is smaller than the angle of the curved surface. The beneficial effect of this setting is that when the lubricating oil diffuses outward due to centrifugal force, after flowing through the inclined plate, it flows back through the path of the circular groove to form a vortex, which blocks the oil that diffuses outward on the inclined plate, thus blocking or reducing the outward flow rate of the lubricating oil.

[0014] Furthermore, the straight path is biased towards the outward direction of the shaft's axis. As the shaft rotates, the bearings or other rotating components will throw the lubricant onto the inclined plane. The oil accumulates at the far end of the inclined plane and flows along the inclined plane towards the inlet end. After flowing to the end of the inclined plane, it is guided back through the path of the circular groove, forming an obstruction.

[0015] Furthermore, the mounting groove is formed on the inner wall or side wall of the main body, and the flexible seal is felt. By installing the felt, it slides relative to the rotating shaft or other seals to form a secondary seal.

[0016] Furthermore, two through grooves are formed on the outside of the sealing seat, and these through grooves are used to form a labyrinth sealing path with other matching seals, thus forming a three-stage seal.

[0017] This application also provides a sealing assembly for a thin oil lubricated shaft, including the aforementioned sealing seat;

[0018] It also includes an oil baffle plate. The outer edge of the oil baffle plate is close to the eddy current deflection groove. The inner diameter of its end face is larger than the outer diameter, and the cross-section is an oblique line pointing from the inside to the outside towards the axis. The inclination direction is the same as the aforementioned inclined plane direction, and the inclination angle is the same as the tangent line at the end of the curved path. When in use, the oil baffle plate rotates with the shaft. The lubricating oil that flows back through the circular groove is on the oil baffle plate and is thrown out to the bottom of the inclined plane on the outer side of the oil baffle plate, forming an effective interception and counterflow.

[0019] Furthermore, it also includes a sealing ring, which includes an annular base and a functional part located on the base. The functional part consists of a number of protrusions corresponding to the through groove. The protrusions and the through groove are fitted with a clearance to form a labyrinth seal. The sealing ring is fixedly mounted on the rotating shaft and rotates with the shaft.

[0020] Furthermore, it also includes a bushing, which is fitted onto the base of the sealing ring. The outer wall of the bushing is nested with a flexible seal. The purpose of the flexible seal is to minimize the sealing gap, but reducing the sealing gap will lead to easy wear. The bushing fitted onto the base effectively overcomes this defect.

[0021] It needs to be reiterated that all components in this application are for shaft sealing. Therefore, fixed components such as sealing seats have a shaft through hole in their center, and all structures around the outer ring of the shaft through hole are arranged in a circular pattern. The outer edge is a connecting component for connecting with the housing / base. Moving components such as sealing rings, bushings, and oil baffles are all ring structures. The "inclined surfaces" described in some of the content are actually conical surfaces.

[0022] This application also provides a shaft lubrication assembly, including a lubrication chamber with several sets of through shaft holes for mounting bearings. A bearing retainer is provided inside the bearing, and the aforementioned sealing assembly is provided outside the bearing. The assembly comprises, from the inside out:

[0023] An oil baffle plate fixedly fitted onto the rotating shaft;

[0024] A sealing seat fixedly connected to the base on the outside of the shaft hole;

[0025] A sealing ring is fixedly fitted onto the rotating shaft, and a bushing is fitted onto the base of the sealing ring.

[0026] This application discloses a vibrator, which includes a housing and an eccentric block, and also includes the aforementioned shaft lubrication assembly;

[0027] The shaft lubrication assembly consists of two shafts mounted on the lubrication chamber, with meshing gears in the middle of the shafts; eccentric blocks are symmetrically mounted at the ends of the shafts.

[0028] This invention, by setting up a multi-stage sealing structure, achieves effective interception and return of lubricating oil in the shaft lubrication system, and has the following beneficial effects:

[0029] 1. A three-stage sealing system is adopted: The first-stage sealing structure utilizes eddy current obstruction grooves to create a backflow eddy current in the lubricating oil when the shaft rotates at high speed and generates centrifugal force, effectively blocking radial leakage of oil; the second-stage sealing structure features a flexible seal mounting groove (e.g., using felt seals), which, in conjunction with the shaft or other seals, achieves a relative sliding seal with minimal clearance, further preventing oil leakage; the third-stage sealing structure uses a through groove on the outside of the seal seat to form a labyrinth seal with the protrusions on the sealing baffle, creating multiple oil leakage barriers. The overall sealing effect is significantly improved, effectively reducing the possibility of lubricating oil overflow, ensuring that the vibrator maintains good lubrication and sealing conditions under continuous operating conditions, and extending the overall service life of the equipment.

[0030] 2. The rational structural design of the eddy current obstruction groove (combination of straight and curved paths) allows the oil to first pass through the inclined surface during the outward expansion process, and then flow back through the circular groove, which greatly reduces the oil leakage speed, controls the local temperature rise, and improves the system heat dissipation problem.

[0031] 3. The combined use of the oil baffle, sealing ring, and bushing in the sealing assembly not only effectively reduces the sealing gap and lowers the risk of wear caused by excessively small gaps, but also adapts to the dynamic sealing requirements generated under high-speed rotation of the shaft, ensuring the long-term stable operation of the lubrication system.

[0032] 4. The shaft lubrication assembly adopts a compact structural design, with multiple sets of through shaft holes for mounting bearings. The lubrication chamber is isolated from the outside through a sealing component, which not only ensures sufficient lubrication of rotating parts, but also prevents the intrusion of external dust and impurities, thereby improving the overall working efficiency of the vibrator and the reliability of the equipment.

[0033] 5. Vibrators using the above lubrication assemblies effectively improve lubrication and sealing performance, extend service life, and reduce maintenance costs. Attached Figure Description

[0034] Figure 1 This is a cross-sectional view of Embodiment 1 of this application;

[0035] Figure 2 This is a schematic diagram of the eddy current obstruction groove in Embodiment 1 of this application;

[0036] Figure 3 , 4 This is a complete structural schematic diagram of Embodiment 1 of this application;

[0037] Figure 5 This is a schematic diagram of the overall connection of Embodiment 2 of this application;

[0038] Figure 6 This is a schematic diagram of the sealing ring in Embodiment 2 of this application;

[0039] Figure 7 This is a schematic diagram of the bushing in Embodiment 2 of this application;

[0040] Figure 8 This is a schematic diagram of the oil baffle in Embodiment 2 of this application;

[0041] Figure 9 This is an overall schematic diagram of Embodiment 3 of this application;

[0042] Figure 10 This is a broken cross-sectional view of Embodiment 3 of this application. Not all cross-sections in the figure are filled with cross-section lines.

[0043] Figure 11 This is a cross-sectional schematic diagram of Embodiment 3 of this application;

[0044] Figure 12 This is a front view of Embodiment 4 of this application;

[0045] Figure 13 This is a perspective view of Embodiment 4 of this application.

[0046] In the picture:

[0047] In the diagram: 1. Connecting part; 2. Main body; 3. Boss; 4. Inclined surface; 5. Vortex obstruction groove; 6. Mounting groove; 7. Through groove; 8. Sealing seat; 9. Sealing retaining ring; 10. Base; 11. Side plate; 12. Protrusion; 13. Bushing; 14. Felt; 15. Oil baffle; 16. Rotating shaft; 17. Base; 18. Lubrication chamber; 19. Mounting seat; 20. Felt; 21. Housing; 22. Long shaft; 23. Short shaft; 24. Eccentric block. Detailed Implementation Example 1

[0048] like Figures 1-3 As shown, a sealing seat 8 is used for sealing the connection between the rotating shaft 16 and the base 17 in this embodiment. Its structure includes two parts: a connecting part 1 and a main body 2.

[0049] The connecting part 1 adopts the form of an annular flange seat and is located on the outer edge of the sealing seat 8. It is used to fix and connect with the base 17 of the vibrator or the housing 21 to ensure the overall stability of the sealing seat 8.

[0050] The inner side of flange connection 1 ("inner side" is...) Figure 1 On the left side of the connecting part 1, a boss 3 with an outer diameter smaller than that on the outer side ("outer side" refers to the direction from the center of the circle outward with the circumference as the direction) is provided for fitting with the base 17. Inside the boss 3 ("inner side" refers to the position of the main body 2 pointing inward with the circle relative to the location of the boss 3), a bevel 4 is provided. The direction of the bevel 4 is outward and the radius gradually decreases, that is, the inner diameter of the initial end is larger than the inner diameter of the terminating end. A circular groove is provided at the terminating end of the bevel 4. The starting end of the cross-section of the circular groove is tangent to the bevel 4, and the angle of the tangent at the distal end (as shown in the figure) is... Figure 1 The horizontal line pointing to the right (0°) is less than the angle of the inclined line on the inclined plane 4 on the same cross section.

[0051] Specifically, the primary sealing structure is an eddy current deflection groove 5, located near the outer edge of the main body 2. This groove has a curved shape, comprising one straight path and one curved path. The straight path begins near the lubrication chamber 18 and extends outward along the inclined surface 4. The curved path ends with a backflow bend, forming an eddy current deflection counter-current. The stroke of the counter-current point is located at... Figure 2 The red arrow in the image is used to control the path of oil leakage.

[0052] A mounting groove 6 is opened around the inner ring of the main body 2, and a felt 20 is installed to form a sliding seal by fitting tightly with the rotating shaft 16 or other sealing elements.

[0053] like Figure 4 As shown, the outer side of the main body 2 ("outer side" is...) Figure 1 Two through slots 7 are opened on the right side of the middle section. The through slots 7 and the protrusions 12 on the sealing baffle form a labyrinth sealing channel. Example 2

[0054] like Figure 5 As shown, a sealing assembly is illustrated. To clearly show the connection order of the various components, only a sectional view from one side is used.

[0055] refer to Figure 5 The sealing assembly includes a sealing seat 8 as described in Embodiment 1. A sealing retaining ring 9 is provided on the outer side of the sealing seat 8. The sealing retaining ring 9 includes an annular base 10 and a radially rotating side plate 11 disposed around the annular base 10. An inwardly oriented protrusion 12 is provided on the surface of the side plate. The complete shape of the sealing retaining ring 9 is referenced. Figure 6 As shown,

[0056] Located on the inside of side panel 11 ("inside" means) Figure 6 The outer ring of the base 10 (on the left side) is provided with Figure 7 The bushing 13 shown has a bent portion that contacts the inner side of the side plate 11. The bushing 13 is an SKF wear-resistant bushing 13.

[0057] A felt 20 is provided in the mounting groove 6 opposite to the bushing 13, and the felt 20 is sealed and nested with the bushing 13.

[0058] An oil baffle plate 15 is provided on the inner side of the base 10 of the sealing ring 9, for reference. Figure 8 There are two opposing oil baffles 15, which are annular in structure, with their outer edges close to the eddy current deflection groove 5. The cross-section is an inclined surface 4 from the inside to the outside, forming a path for the oil to be thrown out. The inner diameter of the end face is larger than the outer diameter. When the shaft 16 rotates, the returning oil is thrown to the bottom through the inclined surface 4 of the oil baffle 15.

[0059] Figure 5 The other parts are other accessories for the use of this component, including the shaft 16 indicated by the dotted line on the right side of the figure, the bearing located below the plate in the figure, and the blank part outside the bearing is the base 17. Example 3

[0060] like Figures 9-11 As shown, a lubrication assembly for a rotating shaft 16 includes a lubrication chamber 18, on which a shaft hole for mounting the rotating shaft 16 is provided, a bearing is embedded in the circumferential hole, and the rotating shaft 16 is sleeved inside the bearing.

[0061] A bearing retainer mounting seat 19 is provided on the inner side of the shaft hole near the cavity. A bearing retainer is provided on the inner side of the bearing to prevent axial displacement of the bearing. A sealing assembly as described in Embodiment 2 is provided on the outer side of the bearing, comprising, from the inside out:

[0062] An oil baffle 15 is fixedly sleeved on the rotating shaft 16;

[0063] A sealing seat 8 is fixedly connected to the base 17 on the outer side of the shaft hole;

[0064] A sealing ring 9 is fixedly fitted onto the rotating shaft 16. A bushing 13 is fitted onto the base 10 of the sealing ring 9. Felt 20 is provided in the mounting groove 6 opposite to the outer wall of the bushing 13. Example 4

[0065] like Figures 12-13 As shown, a vibrator includes a housing 21 that integrates the lubrication assembly of the rotating shaft 16 in Embodiment 3. In this vibrator, the rotating shaft 16 includes a long shaft 22 and a short shaft 23, and also includes an eccentric block 24 disposed on the rotating shaft 16.

[0066] The lubrication assembly of the rotating shaft 16 consists of two rotating shafts 16 disposed on the lubrication chamber 18, with meshing gears disposed in the middle of the rotating shaft 16; eccentric blocks 24 are symmetrically installed at the ends of the rotating shaft 16.

Claims

1. A sealing seat for a rotating shaft, comprising: A connecting part (1) and a main body (2), the connecting part (1) being used to connect with a base (17), characterized in that the main body (2) comprises: The primary sealing structure is located on the inner side, and the secondary and / or tertiary sealing structures are located on the outer side; The primary sealing structure is an eddy current deflection groove (5). The secondary sealing structure is at least one mounting groove (6) for filling or installing a flexible seal. The three-stage sealing structure is at least one through groove (7) arranged radially around the perimeter.

2. The sealing seat for a rotating shaft as described in claim 1, characterized in that, The eddy current deflection groove (5) is opened near the outer edge of the main body (2), and the cross-sectional structure of the eddy current deflection groove has at least one straight path and one curved path. With the direction of lubricant flow as the direction, the starting end of the straight path is close to the lubrication chamber (18), and its end is tangent to the starting end of the curved path. With the horizontal direction as a reference, the tangent angle at the end of the curved path is smaller than the angle of the straight path.

3. A sealing seat for a rotating shaft as described in claim 2, characterized in that, The straight path is biased outward from the axis of rotation (16).

4. The sealing seat for a rotating shaft as described in claim 1, characterized in that, The mounting groove (6) is formed on the inner wall or side wall of the main body (2), and the flexible sealing element is felt (20).

5. A sealing seat for a rotating shaft as described in claim 1, characterized in that, Two through slots (7) are opened on the outside of the sealing seat (8), and the through slots (7) are used to form a labyrinth sealing path with other matching seals.

6. A sealing assembly for a thin oil-lubricated shaft, characterized in that, include: The sealing seat (8) according to any one of claims 1-4; It also includes an oil baffle (15), the outer edge of which is close to the eddy current obstruction groove (5), the inner diameter of its end face is larger than the outer diameter, and the cross-section is an oblique line pointing from the inner side to the outer side towards the axis.

7. A sealing assembly for a thin oil-lubricated shaft as described in claim 6, characterized in that, It also includes a sealing ring (9), on which a number of protrusions (12) corresponding to the through groove (7) are provided, and the protrusions (12) are in clearance fit with the through groove (7).

8. The sealing assembly for a thin oil-lubricated shaft as described in claim 7, characterized in that, It also includes a bushing (13), which is fitted onto the base (10) of the sealing ring (9), and the outer wall of the bushing (13) is sealed and nested with the flexible seal.

9. A shaft lubrication assembly, comprising a lubrication chamber (18), wherein the lubrication chamber (18) has a plurality of through shaft holes for mounting bearings, and a bearing retainer ring is provided on the inner side of the bearing, characterized in that, The bearing is provided with a sealing assembly as described in claim 8 on its outer side, comprising, from the inside out: An oil baffle (15) is fixedly sleeved on the bearing. A sealing seat (8) is fixedly connected to the base (17) on the outer side of the shaft hole; A sealing ring (9) is fixedly sleeved on the rotating shaft (16), and a bushing (13) is sleeved on the base (10) of the sealing ring (9).

10. A vibrator, the vibrator comprising a housing (21) and an eccentric block (24), characterized in that, It also includes a shaft (16) lubrication assembly as described in claim 9; The rotating shaft (16) lubrication assembly consists of two rotating shafts (16) disposed on the lubrication chamber (18), and the rotating shafts (16) are provided with meshing gears in the middle; The eccentric block (24) is symmetrically installed at the end of the rotating shaft (16).

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