Sealing seat, sealing assembly, rotating shaft lubricating assembly and vibration exciter comprising rotating shaft lubricating assembly

Abstract

The invention belongs to the field of mining mechanical equipment, and particularly relates to a vibration exciter of a coal washing vibrating screen, in particular to a sealing seat of a rotating shaft, a sealing assembly, a rotating shaft lubricating assembly and a vibration exciter comprising the rotating shaft lubricating 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] This application belongs to the field of mining machinery and equipment, and specifically relates to an exciter for a coal washing vibrating screen, and more specifically to a sealing seat for a rotating shaft, a sealing assembly, a rotating shaft lubrication assembly, and an exciter including this assembly. Background Art

[0002] The exciter used in a vibrating screen is the core component of the vibrating screen, 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 usually consists of a motor, an eccentric block (or eccentric shaft) and a transmission mechanism. The motor drives the eccentric block to rotate at high speed to generate a centrifugal force, which is transmitted to the screen body to form a regular vibration trajectory. The design of the exciter directly affects the amplitude, frequency and screening efficiency of the vibrating screen. Common ones include single-shaft exciters and double-shaft exciters. The single-shaft structure is simple and suitable for small screening machines, while the double-shaft can generate a more complex vibration trajectory and is suitable for large-scale or high-requirement equipment. During installation, the exciter is generally fixed on the beam of the screen body. By adjusting the mass or angle of the eccentric block, the magnitude and direction of the vibration force can be changed to adapt to different materials and screening requirements. Generally speaking, the 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 short shaft of the exciter are synchronously rotated by meshing of 2 helical gears with the same number of teeth and module, and the gear lubrication method is thin oil lubrication. According to different usage scenarios, the seals commonly used in thin oil lubrication equipment include floating oil seal type mechanical seals, skeleton oil seals, Steffens seals, Gre seals, etc. Compared with other gear devices with the same rotational speed, the gears used in the exciter are larger, with fast self-cooling and low temperature rise caused by gear meshing friction. The temperature rise of the exciter during operation is mainly caused by the temperature rise of the bearings. The bearing temperature rise is relatively high, mainly due to the periodic inertial force generated by the rotation of the eccentric block. Since the exciter is used in vibrating equipment, it is not suitable to set up a heat dissipation device to reduce the temperature of the exciter by lowering the oil temperature. The heat dissipation of the exciter is mainly achieved by the self-cooling of the box body. And the amount of oil added to the exciter is small, and at the same time, the exciter is equipped with an air filter, and the pressure in the box body is relatively not high. Summary of the Invention

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

[0005] Technical Solution: To solve the above technical problem, this application provides a new technical solution.

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

[0007] A primary sealing structure located on the inner side, and a secondary sealing structure and / or a tertiary sealing structure located on the outer side. Here, the outer side and the inner side are relative to being close to or far from the lubrication chamber;

[0008] The primary sealing structure is a vortex obstruction groove; when the rotating shaft rotates, centrifugal force is generated to cause the oil to diffuse outward. The vortex obstruction groove conducts reflux by planning the outward diffusion path of the oil, and can effectively block most of the oil from diffusing outward, playing a primary sealing role;

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

[0010] The tertiary sealing structure is at least one through groove arranged in a circle radially. The through groove is used to cooperate with the protrusions on the sealing baffle to form a labyrinth sealing structure, playing a tertiary sealing role;

[0011] That is, the cover sealing seat can play a tertiary sealing role for the lubricating fluid, greatly improving the sealing performance.

[0012] Furthermore, the vortex obstruction groove is opened near the outer edge of the main body or near the connecting portion. The cross-sectional structure of the vortex obstruction groove has at least one straight path and one curved path; in the direction of the lubricating fluid flow, the starting end of the straight path is close to the lubrication chamber. The straight path starts from the inner edge close to the connecting portion, extends outward and offsets towards the center of the rotating shaft at the same time, that is, a bevel is made outward for one week at the part of the sealing seat closest to the lubrication chamber;

[0013] Its end is tangent to the starting end 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 bevel, and the end is bent back. The angle of the return line is smaller than the angle of the curved surface. The beneficial effect of such a setting is that when the lubricating oil diffuses outward due to centrifugal force, after flowing through the inclined plate, it forms a reverse flow through the path of the circular groove to form a vortex, blocking the oil diffusing outward on the inclined plate, and blocking or reducing the flow rate of the lubricating oil overflowing outward.

[0014] Further, the straight path deflects outward in the direction of the axis of the rotating shaft. When the rotating shaft rotates, the bearing or other rotating components will throw the lubricating fluid onto the inclined surface. The oil accumulates at the far-axis end of the inclined surface and then flows along the inclined surface towards the in-axis end. After flowing to the end of the inclined surface, it is guided back through the path of the circular groove to form an obstruction.

[0015] Further, the installation groove is opened on the inner wall or side wall of the main body, and the flexible seal is a felt. By installing the felt, a secondary seal is formed by sealing and nesting and relatively sliding with the rotating shaft or other seals.

[0016] Further, two through grooves are opened on the outside of the seal seat, and the through grooves are used to form a labyrinth seal path with other matching seals to form a tertiary seal.

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

[0018] It also includes an oil baffle. The outer edge of the oil baffle is close to the eddy current obstruction 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 surface direction, and the inclination angle is the same as the tangent direction of the end of the curved path. When in use, the oil baffle rotates with the shaft. The lubricating oil flowing back through the circular groove is on the oil baffle and is thrown out to the bottom of the inclined surface through the inclined surface on the outside of the oil baffle to form an effective intercepting counterflow.

[0019] Further, it also includes a sealing retaining ring. The sealing retaining ring includes an annular base and a functional part located on the base. The functional part is a protrusion corresponding to the number of through grooves. The protrusion is in clearance fit with the through groove to form a labyrinth seal; the sealing retaining ring is fixedly arranged on the rotating shaft and rotates with the shaft.

[0020] Further, it also includes a bushing. The bushing is sleeved on the base of the sealing retaining ring. The outer wall of the bushing is sealed and nested with the flexible seal. The purpose of setting the flexible seal is to minimize the sealing gap as much as possible, but reducing the sealing gap will lead to the defect of easy wear. The bushing sleeved on the base effectively overcomes this defect.

[0021] It should be reiterated that all components in the present application are for the seal of the rotating shaft. Therefore, for the fixed component such as the seal seat, a rotating shaft through hole is provided in the central part. All structures outside the outer circle of the rotating shaft through hole are arranged in a circular pattern, and its outer edge is a connecting component for connecting with the housing / base; for the moving components such as the sealing retaining ring, the bushing, and the oil baffle, their main bodies are all annular structures. The "inclined surface" described in some parts is actually a conical surface in its physical structure.

[0022] The present application also provides a rotating shaft lubrication assembly, which includes a lubrication chamber. The lubrication chamber is provided with a plurality of groups of through shaft holes for installing bearings. A bearing retaining ring is arranged inside the bearing, and the above-mentioned sealing assembly is arranged outside the bearing, which successively includes from the inside to the outside:

[0023] An oil baffle fixedly sleeved on the rotating shaft;

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

[0025] A sealing retaining ring fixedly sleeved on the rotating shaft, and a shaft bushing is sleeved on the base of the sealing retaining ring.

[0026] An exciter of the present application, the exciter includes a box body and an eccentric block, and also includes the above-mentioned rotating shaft lubrication assembly;

[0027] The rotating shaft lubrication assembly is two rotating shafts arranged on the lubrication chamber. Gears that mesh with each other are arranged in the middle of the rotating shafts; the eccentric blocks are symmetrically installed at the ends of the rotating shafts.

[0028] By setting a multi-stage sealing structure, the present invention realizes the effective interception and reflux of lubricating oil in the rotating shaft lubrication system, and has the following beneficial effects:

[0029] 1. A three-stage sealing system is adopted: the first-stage sealing structure uses an eddy current obstruction groove. When the rotating shaft rotates at a high speed to generate centrifugal force, the lubricating oil forms a reflux eddy current, effectively blocking the radial leakage of the oil; the second-stage sealing structure is provided with a flexible seal installation groove (such as using a felt seal), and under the cooperation of the rotating shaft or other seals, relative sliding sealing is realized with a very small gap, further preventing oil leakage; the third-stage sealing structure forms a labyrinth seal by arranging a through groove outside the sealing seat and the protrusions on the sealing baffle, constituting multiple barriers to oil leakage. The overall sealing effect is significantly improved, effectively reducing the possibility of lubricating oil overflow, ensuring that the exciter can still maintain a good lubrication and sealing state under continuous working conditions, and extending the overall service life of the equipment.

[0030] 2. The reasonable structural design of the eddy current obstruction groove (the combination of a straight path and a curved path) enables the oil to first pass through an inclined slope and then flow back through a circular groove during the outward expansion process, greatly reducing the oil leakage speed and controlling the local temperature rise, improving the system heat dissipation problem.

[0031] 3. The combined use of the oil baffle, the sealing retaining ring and the shaft bushing in the sealing assembly not only effectively reduces the sealing gap, reduces the wear risk caused by too small a gap, but also can meet the dynamic sealing requirements generated by the high-speed rotation of the rotating shaft, ensuring the long-term stable operation of the lubrication system.

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

[0033] 5. The vibrator adopting the above lubrication assembly effectively improves the lubrication and sealing performance, extends the service life and reduces the maintenance cost. Brief Description of the Drawings

[0034] Figure 1 It is a cross-sectional view of the first embodiment of the present application;

[0035] Figure 2 It is a schematic diagram of the principle of the eddy current obstruction groove in the first embodiment of the present application;

[0036] Figure 3 、 4 It is a schematic diagram of the complete structure of the first embodiment of the present application;

[0037] Figure 5 It is a schematic diagram of the overall connection of the second embodiment of the present application;

[0038] Figure 6 It is a schematic diagram of the sealing retaining ring of the second embodiment of the present application;

[0039] Figure 7 It is a schematic diagram of the bushing in the second embodiment of the present application;

[0040] Figure 8 It is a schematic diagram of the oil baffle in the second embodiment of the present application;

[0041] Figure 9 It is a schematic diagram of the overall of the third embodiment of the present application;

[0042] Figure 10 It is a sectional view of the third embodiment of the present application, and not all sections in the figure are filled with section lines;

[0043] Figure 11 It is a sectional view of the third embodiment of the present application;

[0044] Figure 12 It is a front view of the fourth embodiment of the present application;

[0045] Figure 13 It is a three-dimensional view of the fourth embodiment of the present application.

[0046] In the figure:

[0047] In the figure: 1. Connecting part; 2. Main body; 3. Boss; 4. Inclined plane; 5. Eddy current obstruction groove; 6. Installation 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. Box body; 22. Long shaft; 23. Short shaft; 24. Eccentric block. Detailed implementation manners

[0048] Embodiment 1:

[0049] As Figures 1-3 shown, a sealing seat 8. In this embodiment, the sealing seat 8 is mainly used for the connection and sealing between the rotating shaft 16 and the base 17. Its structure includes two parts: a connecting part 1 and a main body 2.

[0050] The connecting part 1 is in the form of an annular flange seat, which is arranged on the outer edge of the sealing seat 8 and is used for fixedly connecting with the base 17 or the box body 21 of the vibrator, ensuring the stability of the overall position of the sealing seat 8.

[0051] Inside the flange connecting part 1 (the "inside" is the left side in Figure 1 ), there is a boss 3 with an outer diameter smaller than the outside of the connecting part 1 (the "outside" indicates the direction from the center of the circle to the outside in the direction of the circumferential radius). The boss 3 is used for socket connection with the base 17. Inside the boss 3 (the "inside" indicates the position pointing inwards relative to the position of the boss 3 and towards the circle of the main body 2), there is a week of inclined plane 4. The direction of the inclined plane 4 points outwards and the radius gradually decreases, that is, the inner diameter of the starting end is greater than the inner diameter of the terminating end. At the terminating end of the inclined plane 4, there is a circular groove. The starting end of the cross-section of the circular groove is tangent to the inclined plane 4, and the angle of the distal tangent (taking the horizontal line pointing to the right in Figure 1 ) is less than the angle of the inclined line on the inclined plane 4 in the same cross-section.

[0052] That is: the primary sealing structure is the eddy current obstruction groove 5. This groove is located near the outer edge of the main body 2 and has a curved path. The design includes a straight path and a curved path. The starting point of the straight path is close to the direction of the lubrication chamber 18 and extends outwards along the inclined plane 4. The end of the curved path has a reflux bending structure, forming an eddy current obstruction and counterflush. The stroke of the counterflush point is at the position of the red arrow in Figure 2 to control the oil leakage path.

[0053] A week of installation groove 6 is opened in the inner circle of the main body 2 part, and a felt 20 is installed to form a sliding seal in close contact with the rotating shaft 16 or other sealing parts.

[0054] As Figure 4 shown, on the outside of the main body 2 (the "outside" is Figure 1On the right side (in the right side of [[]]) there are two through slots 7 opened, and the through slots 7 and the protrusions 12 on the sealing baffle form a labyrinth sealing channel.

[0055] Embodiment Two:

[0056] As Figure 5 shown, a sealing assembly. In the figure, in order to clearly show the connection sequence of each component, only a cross-sectional view of one side is used.

[0057] Refer to Figure 5 , this sealing assembly includes the sealing seat 8 introduced in Embodiment One. A sealing retaining ring 9 is arranged outside the sealing seat 8. The sealing retaining ring 9 includes an annular base 10 and radially rotating side plates 11 arranged around the annular base 10. Protrusions 12 facing inwards are arranged on the plate surface. The complete shape of the sealing retaining ring 9 refers to Figure 6 shown.

[0058] On the outer ring of the base 10 located inside the side plate 11 (the "inside" is the left side in [[]]), a bushing 13 as shown in Figure 6 is arranged. The bent needle part of the bushing 13 contacts the inner side of the side plate 11, and the bushing 13 is a SKF wear-resistant bushing 13. Figure 7 shown.

[0059] A felt 20 is arranged in the installation groove 6 opposite to the bushing 13, and the felt 20 is sealingly nested with the bushing 13.

[0060] An oil baffle 15 is arranged inside the base 10 of the sealing retaining ring 9. Refer to Figure 8 There are two opposite oil baffles 15. The oil baffle 15 is of an annular structure, and the outer edge is close to the eddy current obstruction groove 5. The cross-section is an inclined slope 4 from the inside to the outside, forming an oil discharge path. The inner end face diameter is larger than the outer end face diameter. When rotating with the rotating shaft 16, the reflux oil is thrown to the bottom through the inclined surface 4 of the oil baffle 15.

[0061] Figure 5 The other parts in [[]] are other accessories of this assembly during use, including the rotating shaft 16 indicated by the dotted line on the right side in the figure, the bearing located below the plate in the figure, and the base 17 in the blank part outside the bearing.

[0062] Embodiment Three;

[0063] As Figures 9-11 shown, a lubrication assembly for the rotating shaft 16 includes a lubrication chamber 18. An axial hole for installing the rotating shaft 16 is opened on the lubrication chamber 18. A bearing is embedded in the circumferential hole, and the rotating shaft 16 is sleeved inside the bearing.

[0064] An installation seat 19 for a bearing retaining ring is arranged on the inner wall of the axial hole close to the inner side of the chamber. A bearing retaining ring is arranged inside the bearing to prevent the bearing from axially shifting. A sealing assembly described in Embodiment Two is arranged outside the bearing, which includes, in sequence from the inside to the outside:

[0065] The oil baffle 15 fixedly sleeved on the rotating shaft 16;

[0066] The sealing seat 8 fixedly connected to the base 17 outside the shaft hole;

[0067] The sealing retaining ring 9 fixedly sleeved on the rotating shaft 16, with a bushing 13 sleeved on the base 10 of the sealing retaining ring 9, and a felt 20 is arranged in the installation groove 6 opposite to the outer wall of the bushing 13.

[0068] Embodiment 4;

[0069] As Figures 12-13 shown, a vibrator includes a box body 21 integrated with the rotating shaft 16 lubrication assembly in Embodiment 3. In this vibrator, the rotating shaft 16 includes a long shaft 22 and a short shaft 23, and further includes an eccentric block 24 arranged on the rotating shaft 16.

[0070] The rotating shaft 16 lubrication assembly is two rotating shafts 16 arranged on the lubrication chamber 18, and gears meshing with each other are arranged in the middle of the rotating shaft 16; the eccentric blocks 24 are symmetrically installed at the ends of the rotating shaft 16.

Claims

1. A sealing seat of a rotating shaft, comprising: A connecting portion (1) and a main body (2), wherein the connecting portion (1) is used to connect to a base (17), and is characterized in that the main body (2) comprises: A primary sealing structure located on the inside, and a secondary sealing structure and / or a tertiary sealing structure located on the outside; The primary sealing structure is an eddy current blocking groove (5); The secondary sealing structure is at least one installation groove (6) for filling or installing a flexible sealing element; The three-stage sealing structure is at least one through groove (7) arranged radially around a circle.

2. A sealing seat for a rotating shaft as claimed in claim 1, characterized in that: The eddy current blocking groove (5) is opened near the outer edge of the main body (2), and the cross-section structure of the eddy current blocking groove has at least one straight path and one curved path; Taking the flow direction of the lubricating fluid as the direction, the starting end of the straight path is close to the lubrication chamber (18), and the end thereof is tangent to the starting end of the curved path. Taking the horizontal direction as a reference, the tangent angle of the end of the curved path is smaller than the angle of the straight path.

3. A sealing seat for a rotating shaft as claimed in claim 2, characterized in that: The straight path deviates in a direction outward from the axis of the rotating shaft (16).

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

5. The sealing seat of a rotating shaft according to claim 1, characterized in that: The two through grooves (7) are opened on the outer side of the sealing seat (8), and the through grooves (7) are used to form a labyrinth sealing path with other matching sealing components.

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 to 4; It also includes an oil baffle plate (15), the outer edge of which is close to the vortex 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 inside to the outside to the axis.

7. A seal assembly for a thin oil lubricated shaft as claimed in claim 6, characterized in that: It also comprises a sealing retaining ring (9), on which a number of protrusions (12) corresponding to the through slots (7) are provided, and the protrusions (12) are clearance-matched with the through slots (7).

8. A seal assembly for a thin oil lubricated shaft as claimed in claim 7, characterized in that: It also comprises a shaft liner (13), wherein the shaft liner (13) is sleeved on the base (10) of the sealing retaining ring (9), and the outer wall of the shaft liner (13) is sealingly nested with the flexible sealing element.

9. A rotating shaft lubrication assembly, comprising a lubrication chamber (18), wherein the lubrication chamber (18) is provided with a plurality of through-going shaft holes, wherein the shaft holes are used to install bearings, wherein a bearing retaining ring is provided inside the bearing, wherein: The outer side of the bearing is provided with a sealing assembly as claimed in claim 8, which includes, from the inside to the outside: An oil baffle (15) fixedly sleeved on the bearing; A sealing seat (8) fixedly connected to a base (17) outside the shaft hole; A sealing ring (9) is fixedly sleeved on the rotating shaft (16), and a shaft bushing (13) is sleeved on a base (10) of the sealing ring (9).

10. An exciter, comprising a housing (21) and an eccentric block (24), characterized in that: Also includes a shaft (16) lubrication assembly as claimed in claim 9; The rotating shaft (16) lubrication assembly comprises two rotating shafts (16) arranged on the lubrication chamber (18), and mutually meshing gears are arranged in the middle of the rotating shafts (16); The eccentric block (24) is symmetrically mounted on the end of the rotating shaft (16).

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