Shaft seal structure and ball mill
Patent Information
- Application Number
- CN202521642661.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-04
- Publication Date
- 2026-09-08
- Estimated Expiration
- 2035-08-04
AI Technical Summary
[0002]在球磨机运行过程中，小齿轮轴因受力复杂常产生轴向窜动，导致传统骨架油封的密封唇与轴颈反复摩擦，密封性能急剧下降
本实用新型通过集油槽与密封槽贴合连接，能够及时收集从轴承座渗出的润滑油，避免油液直接外泄，密封槽内的密封材料也挡住了部分润滑油使其流回集油槽进行回收，密封与集油的协同作用，在保证密封可靠性的同时，实现润滑油的回收利用，适用于高频率运行的球磨机等重载设备，有效降低维护成本和生产波动；另外，密封槽内填充密封材料，可适应小齿轮轴的轴向窜动，减少摩擦磨损，且由于集油槽分担了泄漏油液的收集功能，密封槽内的密封材料主要起动态密封作用，减少油液长期浸泡导致的密封材料老化，提高了整体密封结构的耐用性。
Smart Images
Figure CN224730095U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of shaft sealing technology, and in particular to a shaft sealing structure and a ball mill. Background Technology
[0002] During ball mill operation, the pinion shaft often experiences axial movement due to complex forces, causing repeated friction between the sealing lip and journal of the traditional skeleton oil seal, resulting in a sharp decline in sealing performance. As the sealing lip wears more severely, lubricating oil splashes outward along the axial leakage path under centrifugal force, not only wasting oil but also causing equipment pollution and safety hazards. Because ball mills require continuous high-load operation, leakage problems can only be addressed within a limited maintenance period. Traditional maintenance solutions require complete disassembly of the gland, felt, and oil seal assembly, taking several hours and severely impacting production continuity. Existing sealing structures have significant defects: on the one hand, a single skeleton oil seal cannot adapt to dynamic axial displacement, leading to a vicious cycle after wear; on the other hand, there is no recovery channel for leaked oil, which overflows directly to the outside of the equipment. Although some solutions have attempted to add an oil retaining ring or improve the oil seal material, they have failed to fundamentally solve the problems of oil collection and axial compensation, instead increasing maintenance difficulty due to structural complexity. Furthermore, frequent oil seal replacements lead to increased maintenance costs, and the average lifespan of the seals is often lower than the equipment overhaul cycle, creating a passive situation of "maintenance-leakage-re-maintenance". Therefore, there is an urgent need to develop a shaft seal structure that integrates oil recovery and dynamic sealing functions, so as to achieve directional flow of leaked oil and long-term protection of sealing materials without stopping the machine, thereby breaking through the limitations of traditional sealing technology on continuous operation of equipment. Utility Model Content
[0003] The purpose of this invention is to provide a shaft sealing structure and a ball mill to solve the problems existing in the prior art, so as to achieve oil recovery and dynamic sealing without stopping the machine, and break through the limitations of traditional sealing technology on continuous operation of equipment.
[0004] To achieve the above objectives, this utility model provides the following solution: This utility model provides a shaft sealing structure, including: an oil collecting groove, a sealing groove, an oil collecting hole, and a connecting structure. The oil collecting groove is fitted and connected to the sealing groove. The oil collecting groove is connected to the bearing seat through the connecting structure. The oil collecting groove is used to collect and temporarily store lubricating oil. The sealing groove is filled with sealing material. The oil collecting groove is provided with the oil collecting hole, which is used to discharge the lubricating oil in the oil collecting groove.
[0005] In one embodiment, the oil collecting groove includes a first radial support wall, a second radial support wall, and a first annular bottom wall. The first radial support wall and the second radial support wall are radially connected to both ends of the first annular bottom wall. The sealing groove includes a third radial support wall and a second annular bottom wall. The first annular bottom wall and the second annular bottom wall are axially connected. The second radial support wall is radially connected to one end of the second annular bottom wall. The third radial support wall is connected to the other end of the second annular bottom wall. The first radial support wall, the second radial support wall, and the third radial support wall are arranged parallel to each other along the radial direction of the pinion shaft.
[0006] As one embodiment, the connection structure includes a gland, which is radially connected to the outer surface of the oil collection groove that fits against the bearing seat, and the gland is used to connect to the bearing seat.
[0007] As one embodiment, the gland includes a radial protrusion structure with a through hole for threaded connection with a bearing housing.
[0008] As one embodiment, it also includes an oil guide pipe, wherein the oil collection hole is disposed on the first annular bottom wall, and the oil guide pipe is connected to the oil collection hole.
[0009] As one embodiment, the oil collecting groove and the sealing groove are welded together to form an integral sealing structure.
[0010] As one embodiment, the sealing material is packing or felt.
[0011] As one embodiment, a buffer pad is also included, which is located between the oil collection groove and the bearing housing.
[0012] As one embodiment, the oil collecting groove and the sealing groove are clearance-fitted with the pinion shaft.
[0013] This utility model also provides a ball mill, including a pinion shaft, a bearing housing, and a shaft sealing structure, wherein the shaft sealing structure is used for sealing the pinion bearing housing and recovering lubricating oil.
[0014] The present invention achieves the following technical advantages over the prior art: This invention, through the close connection between the oil collection groove and the sealing groove, can promptly collect lubricating oil seeping from the bearing housing, preventing direct oil leakage. The sealing material in the sealing groove also blocks some of the lubricating oil, causing it to flow back to the oil collection groove for recycling. The synergistic effect of sealing and oil collection ensures sealing reliability while realizing the recycling of lubricating oil. It is suitable for heavy-duty equipment such as ball mills that operate at high frequencies, effectively reducing maintenance costs and production fluctuations. In addition, the sealing material filled in the sealing groove can accommodate the axial movement of the pinion shaft, reducing friction and wear. Since the oil collection groove also takes on the function of collecting leaked oil, the sealing material in the sealing groove mainly plays a dynamic sealing role, reducing the aging of the sealing material caused by long-term immersion in oil and improving the durability of the overall sealing structure. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a front view of the shaft seal structure in an embodiment of this utility model; Figure 2 This is a cross-sectional view of the shaft sealing structure in an embodiment of this utility model; Figure 3 This is a schematic diagram of the overall structure of the shaft sealing structure in an embodiment of this utility model; Among them, 1. oil collection groove; 2. sealing groove; 3. oil collection hole; 4. first radial support wall; 5. second radial support wall; 6. third radial support wall; 7. first annular bottom wall; 8. second annular bottom wall; 9. gland; 10. through hole; 11. oil guide pipe; 12. connecting bolt. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0018] The purpose of this invention is to provide a shaft sealing structure and a ball mill to solve the problems existing in the prior art, so as to achieve oil recovery and dynamic sealing without stopping the machine, and break through the limitations of traditional sealing technology on continuous operation of equipment.
[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0020] like Figures 1-3 As shown, this utility model provides a shaft sealing structure, including: an oil collecting groove 1, a sealing groove 2, an oil collecting hole 3, and a connecting structure. The oil collecting groove 1 is fitted and connected to the sealing groove 2. The oil collecting groove 1 is connected to the bearing seat through the connecting structure. The oil collecting groove 1 is used to collect and temporarily store lubricating oil. The sealing groove 2 is filled with sealing material. The oil collecting groove 1 is provided with an oil collecting hole 3, which is used to discharge the lubricating oil in the oil collecting groove 1.
[0021] This invention, through the close connection between the oil collection groove 1 and the sealing groove 2, can promptly collect lubricating oil seeping from the bearing housing, preventing direct oil leakage. The sealing material in the sealing groove 2 also blocks some of the lubricating oil, causing it to flow back to the oil collection groove 1 for recycling. The synergistic effect of sealing and oil collection ensures the reliability of the seal while realizing the recycling of lubricating oil. It is suitable for heavy-duty equipment such as ball mills that operate at high frequencies, effectively reducing maintenance costs and production fluctuations. In addition, the sealing material filled in the sealing groove 2 can accommodate the axial movement of the pinion shaft, reducing friction and wear. Since the oil collection groove 1 shares the function of collecting leaked oil, the sealing material in the sealing groove 2 mainly plays a dynamic sealing role, reducing the aging of the sealing material caused by long-term immersion in oil and improving the durability of the overall sealing structure.
[0022] Furthermore, the shaft seal structure is a complete annular structure that is directly fitted onto the pinion shaft.
[0023] Furthermore, the shaft seal structure includes two semi-annular structures, each with a radial protrusion at both ends. The radial protrusions are equipped with connecting bolts 12. The two semi-annular structures are fitted onto the pinion shaft, and the connecting bolts 12 connect the two semi-annular structures together to form an integral shaft seal structure.
[0024] In one embodiment, the oil collecting groove 1 includes a first radial support wall 4, a second radial support wall 5, and a first annular bottom wall 7. The first radial support wall 4 and the second radial support wall 5 are radially connected to both ends of the first annular bottom wall 7. The sealing groove 2 includes a third radial support wall 6 and a second annular bottom wall 8. The first annular bottom wall 7 and the second annular bottom wall 8 are axially connected. The second radial support wall 5 is radially connected to one end of the second annular bottom wall 8, and the third radial support wall 6 is connected to the other end of the second annular bottom wall 8. The first radial support wall 4, the second radial support wall 5, and the third radial support wall 6 are arranged parallel to each other along the radial direction of the pinion shaft.
[0025] Furthermore, the first annular bottom wall 7 and the second annular bottom wall 8 are a single annular wall with the same radius.
[0026] As one embodiment, the connection structure includes a pressure cap 9, which is radially connected to the outer surface of the oil collection groove 1 that is in contact with the bearing seat. The pressure cap 9 is used to connect with the bearing seat.
[0027] As one embodiment, the pressure cap 9 includes a radial protrusion structure with a through hole 10 for threaded connection with the bearing seat.
[0028] As one embodiment, it also includes an oil guide pipe 11, and an oil collection hole 3 is disposed on the first annular bottom wall 7, with the oil guide pipe 11 connected to the oil collection hole 3.
[0029] As one embodiment, the oil collecting groove 1 and the sealing groove 2 are welded together to form an integral sealing structure.
[0030] Furthermore, the oil collection tank 1, the sealing tank 2, and the pressure cap 9 are welded together to form an integral sealing structure.
[0031] As one implementation method, the sealing material is packing or felt.
[0032] As one embodiment, a buffer pad is also included, which is located between the oil collection groove 1 and the bearing housing.
[0033] As one embodiment, the oil collecting groove 1 and the sealing groove 2 are clearance-fitted with the pinion shaft.
[0034] The installation steps of the shaft seal structure in one embodiment of this utility model are as follows: fill the sealing groove 2 with sealing materials such as packing and felt; fit the two semi-annular structures of the shaft seal structure onto the pinion shaft and install the connecting bolts 12; install a rubber pad between the shaft seal structure and the bearing seat; adjust one side of the oil guide pipe 11 to be vertically downward; adjust the position so that the through holes 10 on the pressure cap 9 correspond one-to-one with the threaded holes on the bearing seat, and install the fastening bolts to fix the shaft seal structure on the bearing seat.
[0035] The working principle of the shaft sealing structure in one embodiment of this utility model is as follows: the pinion shaft drives the inner ring of the bearing to rotate in the same direction under the drive of the motor, and continuously throws the lubricating oil onto the inner wall of the bearing seat. The lubricating oil continuously seeps out along the inner wall of the bearing seat, enters the oil collection tank 1 through the pressure cap 9, and is guided into the lubricating oil tank for circulation in the oil collection tank 1 through the oil guide pipe 11 under the gravity of the lubricating oil itself. The lubricating oil is blocked back into the oil collection tank 1 by the sealing material in the sealing groove 2 for recycling.
[0036] This utility model also provides a ball mill, including a pinion shaft, a bearing housing, and a shaft sealing structure. The pinion shaft passes through the bearing housing, and the shaft sealing structure is located on the outside of the bearing housing. The shaft sealing structure is sleeved on the pinion shaft and fixed on the bearing housing, and the shaft sealing structure is used for sealing the pinion bearing housing and recovering lubricating oil.
[0037] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.
Claims
1. A shaft seal structure, characterized in that, include: The oil collection groove (1), sealing groove (2), oil collection hole (3), and connecting structure are provided. The oil collection groove (1) is fitted and connected to the sealing groove (2). The oil collection groove (1) is connected to the bearing seat through the connecting structure. The oil collection groove (1) is used to collect and temporarily store lubricating oil. The sealing groove (2) is filled with sealing material. The oil collection groove (1) is provided with the oil collection hole (3). The oil collection hole (3) is used to discharge the lubricating oil in the oil collection groove (1).
2. The shaft seal structure according to claim 1, characterized in that, The oil collection groove (1) includes a first radial support wall (4), a second radial support wall (5), and a first annular bottom wall (7). The first radial support wall (4) and the second radial support wall (5) are radially connected to both ends of the first annular bottom wall (7). The sealing groove (2) includes a third radial support wall (6) and a second annular bottom wall (8). The first annular bottom wall (7) and the second annular bottom wall (8) are axially connected. The second radial support wall (5) is radially connected to one end of the second annular bottom wall (8). The third radial support wall (6) is connected to the other end of the second annular bottom wall (8). The first radial support wall (4), the second radial support wall (5), and the third radial support wall (6) are arranged parallel to each other along the radial direction of the pinion shaft.
3. The shaft seal structure according to claim 1, characterized in that, The connection structure includes a pressure cap (9), which is radially connected to the outer surface of the oil collection groove (1) that is in contact with the bearing seat, and the pressure cap (9) is used to connect to the bearing seat.
4. The shaft seal structure according to claim 3, characterized in that, The pressure cap (9) includes a radial protrusion structure, on which a through hole (10) is provided, the through hole (10) being used for threaded connection with a bearing seat.
5. The shaft seal structure according to claim 2, characterized in that, It also includes an oil guide pipe (11), and the oil collection hole (3) is disposed on the first annular bottom wall (7), and the oil guide pipe (11) is connected to the oil collection hole (3).
6. The shaft seal structure according to claim 1, characterized in that, The oil collection groove (1) and the sealing groove (2) are welded together to form an integral sealing structure.
7. The shaft seal structure according to claim 1, characterized in that, The sealing material is packing or felt.
8. The shaft seal structure according to claim 1, characterized in that, It also includes a buffer pad, which is located between the oil collection groove (1) and the bearing seat.
9. The shaft seal structure according to claim 1, characterized in that, The oil collecting groove (1) and the sealing groove (2) are clearance fit with the pinion shaft.
10. A ball mill, comprising a pinion shaft and a bearing housing, characterized in that, It also includes the shaft seal structure as described in any one of claims 1-9, for sealing the pinion bearing housing and recovering lubricating oil.