High-speed sealing structure of direct-drive rotary table

Abstract

The utility model discloses a high-speed sealing structure of a direct-drive rotary table, which comprises a rotary table body, a bearing seat mounted at one end of the rotary table body, a bearing mounted in the bearing seat, a rotary shaft mounted in the bearing, a rotary disk mounted at one end of the rotary shaft protruding out of the bearing, and an air seal ring mounted between the rotary disk and the bearing seat. A bearing outer ring pressing ring is further installed on the outer ring of the bearing, elastic rubber rings are installed at the positions, corresponding to the rotary disc, of the bearing outer ring pressing ring, graphite rings are installed at the opposite positions of the two elastic rubber rings, and the two graphite rings make close contact. The dynamic sealing structure design is adopted, high-pressure compressed air enters from the first air path in the rotary table machine body and is finally exhausted to the atmosphere from the slit between the bearing seat and the rotary disc, and therefore the air sealing effect is achieved; meanwhile, the graphite ring adopted by the utility model can prevent the cutting fluid from entering the bearing and the rotary table body from a gap between the rotating shaft and the bearing outer ring pressing ring.

Description

Technical Field

[0001] This utility model relates to the field of CNC machining technology, specifically to a high-speed sealing structure for a direct-drive rotary table. Background Technology

[0002] Most existing milling and turning rotary tables are low-speed rotary tables, typically below 250 rpm. The sealing between the machine bodies is usually achieved using rubber oil seals. Rubber oil seals have good elasticity and certain oil and wear resistance, effectively preventing leakage of lubricating oil and other media at relatively low speeds through a tight fit between the lip and the rotating shaft. However, as the rotary table speed increases, the friction between the oil seal lip and the rotating shaft increases significantly. This leads to the generation of a large amount of heat, causing the oil seal temperature to rise sharply, accelerating rubber aging and wear, and potentially even causing deformation or tearing of the oil seal lip, thus reducing sealing performance or even causing failure. Furthermore, at high-speed rotation, the oil seal lip's ability to follow the rotating shaft is challenged, making it difficult to maintain a good seal. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a high-speed sealing structure for a direct-drive turntable, thereby solving the problems mentioned in the background art.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A high-speed sealing structure for a direct-drive turntable includes a turntable body, a bearing housing mounted at one end of the turntable body, a bearing installed inside the bearing housing, a rotary shaft installed inside the bearing, a rotary disk mounted at one end of the rotary shaft protruding from the bearing, an air seal ring installed between the rotary disk and the bearing housing, an outer ring pressure ring mounted on the outer ring of the bearing, elastic rubber rings mounted at corresponding positions on the outer ring pressure ring and the rotary disk, and graphite rings mounted at opposite positions on the two elastic rubber rings, with the two graphite rings in close contact.

[0006] As a preferred embodiment of the high-speed sealing structure of a direct-drive rotary table, a first air passage is provided at one end of the rotary table body away from the rotary disk. The first air passage extends towards the other end of the rotary table body to the bearing housing. A second air passage is provided inside the bearing housing, and the second air passage is connected to the first air passage. An annular air groove is provided at one end of the bearing housing near the air seal ring. The air seal ring has several small exhaust holes spaced apart along its circumference. The annular air groove is connected to the second air passage and the small exhaust holes respectively. An exhaust chamber is provided between the bearing housing, the air seal ring, and the rotary disk, and the exhaust chamber is connected to the small exhaust holes.

[0007] As a preferred embodiment of the high-speed sealing structure of a direct-drive turntable, the two sides of the bearing housing protrude outward to form a first step structure, and the two sides of the rotary table are recessed inward to form a second step structure. The inner wall of the second step structure abuts against the outer wall of the first step structure, and the exhaust chamber is located on the inner wall of the second step structure of the rotary table.

[0008] As a preferred embodiment of the high-speed sealing structure of a direct-drive turntable, the bearing housing has a first mounting groove at one end near the rotary table, the first mounting groove is connected to the annular groove, the air seal ring is installed in the first mounting groove, the rotary table has a second mounting groove at the position corresponding to the first mounting groove, the air seal ring protrudes from the first mounting groove and is installed in the second mounting groove, and the exhaust chamber is connected to the second mounting groove.

[0009] As a preferred embodiment of the high-speed sealing structure of a direct-drive turntable, a third mounting groove is provided at one end of the outer ring of the bearing near the rotary table. One of the elastic rubber rings and the graphite ring are sequentially installed in the third mounting groove. A fourth mounting groove is provided on the rotary table corresponding to the position of the third mounting groove, and the other elastic rubber ring and the graphite ring are installed in the fourth mounting groove.

[0010] As a preferred embodiment of the high-speed sealing structure for a direct-drive turntable, the distance from the gas seal ring to the rotating shaft is greater than the distance from the graphite ring to the rotating shaft.

[0011] The beneficial effects of this utility model are:

[0012] This invention's direct-drive rotary table high-speed sealing structure adopts a dynamic sealing design. High-pressure compressed air enters from the first air passage inside the rotary table body and then enters the annular air groove through the second air passage inside the bearing housing. The high-pressure gas fills the annular air groove and then exits through a ring of small exhaust holes in the air seal ring. The exited gas enters the exhaust chamber composed of the rotary table, the air seal ring, and the bearing housing. Under pressure, the gas in the exhaust chamber will be discharged in both inward and outward directions. The high-pressure gas flowing inward along the slit between the bearing housing and the rotary table will be blocked by the graphite ring, while the other high-pressure gas will be discharged outward into the atmosphere along the slit between the bearing housing and the rotary table, thus achieving the effect of air sealing. Furthermore, the edges of the bearing housing and the rotary table are designed in a stepped shape, which can effectively reduce the impact pressure of the cutting fluid on the discharged gas at the slit. At the same time, the graphite ring used in this invention can prevent the cutting fluid from entering the bearing and the rotary table body from the gap between the rotary shaft and the outer ring pressure ring of the bearing. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly described below. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of the direct-drive turntable high-speed sealing structure described in this utility model.

[0015] Figure 2 This is a partial structural schematic diagram of the direct-drive turntable high-speed sealing structure described in this utility model.

[0016] Figure 3 This is a partial structural breakdown diagram of the direct-drive turntable high-speed sealing structure described in this utility model.

[0017] Figure 4 This is a schematic diagram of the structure of the gas sealing ring described in this utility model.

[0018] In the picture:

[0019] 1. Turntable body; 2. Bearing housing; 3. Bearing; 4. Rotary shaft; 5. Turntable; 6. Air seal ring; 7. Bearing outer ring pressure ring; 8. Elastic rubber ring; 9. Graphite ring; 10. First air passage; 11. Second air passage; 12. Annular air groove; 13. Small exhaust hole; 14. Exhaust chamber; 15. First step structure; 16. Second step structure; 17. First mounting groove; 18. Second mounting groove. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0022] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0023] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] like Figure 1 As shown, this utility model provides a high-speed sealing structure for a direct-drive turntable, including a turntable body 1, a bearing seat 2 installed at one end of the turntable body 1, a bearing 3 installed inside the bearing seat 2, a rotary shaft 4 installed inside the bearing 3, a rotary disk 5 installed at one end of the rotary shaft 4 protruding from the bearing 3, an air seal ring 6 installed between the rotary disk 5 and the bearing seat 2, a bearing outer ring pressure ring 7 installed on the outer ring of the bearing 3, elastic rubber rings 8 installed at corresponding positions of the bearing outer ring pressure ring 7 and the rotary disk 5, and graphite rings 9 installed at opposite positions of the two elastic rubber rings 8, with the two graphite rings 9 in close contact.

[0025] like Figures 2 to 4As shown, a first air passage 10 is provided at the end of the turntable body 1 away from the rotary table 5. High-pressure compressed air can enter the first air passage 10 from the tail of the turntable body 1. The first air passage 10 extends towards the other end of the turntable body 1 to the bearing seat 2. A second air passage 11 is provided inside the bearing seat 2, and the second air passage 11 is connected to the first air passage 10. An annular groove 12 is provided at the end of the bearing seat 2 near the air seal ring 6. High-pressure gas enters the annular groove 12 from the first air passage 10 through the second air passage 11 of the bearing seat 2, and the annular groove 12 will be filled with high-pressure gas. At the same time, the air seal ring 6 has several small exhaust holes 13 distributed at intervals along its circumference. The annular groove 12 is connected to the second air passage 11 and the small exhaust holes 13 respectively. The high-pressure gas will be discharged through the small exhaust holes 13 of the air seal ring 6. Since an exhaust chamber 14 is provided between the bearing seat 2, the air seal ring 6 and the rotary table 5, and the exhaust chamber 14 is connected to the small exhaust holes 13, the discharged gas will enter The gas in the exhaust chamber 14, which is composed of bearing housing 2, air seal ring 6, and rotary table 5, will be discharged in both directions under pressure. The high-pressure gas flowing inward along the slit between bearing housing 2 and rotary table 5 will be blocked by graphite ring 9, preventing the formation of an air passage and thus preventing the gas from being discharged. The gas in this narrow cavity is stationary high-pressure gas. Therefore, the high-pressure gas in the exhaust chamber 14 can only be discharged outward to the atmosphere along the air passage formed by the slit between bearing housing 2 and rotary table 5. Due to the narrowness of the air passage, the high-pressure gas in the exhaust chamber 14 cannot be discharged directly at once. Instead, it will form a high-pressure vortex in the exhaust chamber 14 and be discharged in the subsequent vortexes. The gas discharged outward along the slit and the high-pressure vortex in the exhaust chamber 14 can jointly resist the pressure of the cutting fluid, effectively preventing the cutting fluid from entering the exhaust chamber 14 from the slit, thereby achieving a dynamic sealing effect on the rotary table body 1.

[0026] Preferably, in this embodiment, the two sides of the bearing seat 2 protrude outward to form a first step structure 15, and the two sides of the rotary disk 5 are recessed inward to form a second step structure 16. The inner wall of the second step structure 16 abuts against the outer wall of the first step structure 15. The exhaust chamber 14 is located on the inner wall of the second step structure 16 of the rotary disk 5. The edges of the bearing seat 2 and the rotary disk 5 in this embodiment are designed in a step shape, which can effectively reduce the impact pressure of the cutting fluid on the exhaust gas at the slit.

[0027] Specifically, in this embodiment, the bearing housing 2 near the rotary table 5 has a first mounting groove 17, which is connected to the annular groove 12. The air seal ring 6 is installed in the first mounting groove 17. The rotary table 5 has a second mounting groove 18 corresponding to the position of the first mounting groove 17. The air seal ring 6 protrudes from the first mounting groove 17 and is installed in the second mounting groove 18. The exhaust chamber 14 is connected to the second mounting groove 18.

[0028] More specifically, in this embodiment, the bearing outer ring pressure ring 7 has a third mounting groove at one end near the rotary table 5. One elastic rubber ring 8 and a graphite ring 9 are sequentially installed in the third mounting groove. The rotary table 5 has a fourth mounting groove corresponding to the position of the third mounting groove. Another elastic rubber ring 8 and a graphite ring 9 are installed in the fourth mounting groove. The graphite ring 9 has good lubricity and wear resistance and can withstand high speeds. It can play a secondary sealing role for the rotary table body 1. The two graphite rings 9 are tightly combined under the pressure of the two elastic rubber rings 8. With continuous wear, the contact surface between the two will become tighter and tighter, and the sealing effect will become better and better.

[0029] Preferably, in this embodiment, the distance from the air seal ring 6 to the rotating shaft 4 is greater than the distance from the graphite ring 9 to the rotating shaft 4, and the bearing housing 2, rotating disk 5, bearing outer ring pressure ring 7 and graphite ring 9 form a sealed narrow cavity.

[0030] It should be stated that the above-described specific embodiments are merely preferred embodiments of this utility model and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to this utility model. However, such variations, as long as they do not depart from the spirit of this utility model, should be within the protection scope of this utility model. Furthermore, some terminology used in this application specification and claims is not limiting, but merely for ease of description.

Claims

1. A high-speed sealing structure for a direct-drive rotary table, characterized in that, The system includes a turntable body (1), a bearing housing (2) is installed at one end of the turntable body (1), a bearing (3) is installed inside the bearing housing (2), a rotary shaft (4) is installed inside the bearing (3), a rotary disk (5) is installed at one end of the rotary shaft (4) protruding from the bearing (3), an air seal ring (6) is installed between the rotary disk (5) and the bearing housing (2), a bearing outer ring pressure ring (7) is also installed on the outer ring of the bearing (3), an elastic rubber ring (8) is installed at the corresponding position of the bearing outer ring pressure ring (7) and the rotary disk (5), and a graphite ring (9) is installed at the opposite position of the two elastic rubber rings (8), with the two graphite rings (9) in close contact.

2. The high-speed sealing structure for a direct-drive rotary table according to claim 1, characterized in that, The turntable body (1) has a first air passage (10) at one end away from the rotary table (5). The first air passage (10) extends to the bearing seat (2) at the other end of the turntable body (1). The bearing seat (2) has a second air passage (11) inside. The second air passage (11) is connected to the first air passage (10). The bearing seat (2) has an annular air groove (12) at one end near the air seal ring (6). The air seal ring (6) has several small exhaust holes (13) spaced apart along its circumference. The annular air groove (12) is connected to the second air passage (11) and the small exhaust holes (13) respectively. An exhaust chamber (14) is provided between the bearing seat (2), the air seal ring (6) and the rotary table (5). The exhaust chamber (14) is connected to the small exhaust holes (13).

3. The high-speed sealing structure for a direct-drive rotary table according to claim 2, characterized in that, The two sides of the bearing seat (2) protrude outward to form a first step structure (15), and the two sides of the turntable (5) are recessed inward to form a second step structure (16). The inner wall of the second step structure (16) abuts against the outer wall of the first step structure (15), and the exhaust chamber (14) is located on the inner wall of the second step structure (16) of the turntable (5).

4. The high-speed sealing structure for a direct-drive rotary table according to claim 2, characterized in that, The bearing housing (2) has a first mounting groove (17) at one end near the rotary table (5). The first mounting groove (17) is connected to the annular groove (12). The air seal ring (6) is installed in the first mounting groove (17). The rotary table (5) has a second mounting groove (18) at the position corresponding to the first mounting groove (17). The air seal ring (6) protrudes from the first mounting groove (17) and is installed in the second mounting groove (18). The exhaust chamber (14) is connected to the second mounting groove (18).

5. The high-speed sealing structure for a direct-drive rotary table according to claim 1, characterized in that, The bearing outer ring pressure ring (7) has a third mounting groove at one end near the rotary table (5). One of the elastic rubber rings (8) and the graphite ring (9) are installed in the third mounting groove in sequence. The rotary table (5) has a fourth mounting groove at the position corresponding to the third mounting groove. The other elastic rubber ring (8) and the graphite ring (9) are installed in the fourth mounting groove.

6. The high-speed sealing structure for a direct-drive rotary table according to claim 1, characterized in that, The distance from the gas sealing ring (6) to the rotating shaft (4) is greater than the distance from the graphite ring (9) to the rotating shaft (4).

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