Bassinet type high speed rotary table sealing device and sealing method

Abstract

The application discloses a cradle type high-speed rotary table sealing device, which comprises a sealing seat, the sealing seat is located in a space formed by the connection of a rotating shaft, a workbench and a cradle base, the sealing seat is fixedly connected with the cradle base, the sealing seat is gap-mounted with the workbench, and the sealing seat is gap-mounted with the rotating shaft; a drainage channel is radially formed in the outer ring main body of the sealing seat; the upper surface of the inner ring of the sealing seat is a sunken step, a sealing assembly and a rotary sealing ring are sleeved on the sunken step; the gap between the sealing seat and the workbench is communicated with an annular cavity two, the annular cavity two is communicated with an annular cavity one, the annular cavity one is communicated with an air inlet channel, and the annular cavity two is additionally communicated with an air cavity. The application further discloses a cradle type high-speed rotary table sealing method. The application belongs to the technical field of mechanical sealing equipment, and solves the problems of unreasonable sealing structure setting, unreliable sealing and influence on the service life of the cradle rotary table in the prior art.

Description

Technical Field

[0001] This invention belongs to the technical field of mechanical seal equipment, and relates to a cradle-type high-speed turntable sealing device. This invention also relates to a cradle-type high-speed turntable sealing method. Background Technology

[0002] The core functional component of a cradle-type five-axis machining center is the cradle turntable. During the machining process, the machine tool often needs to spray cutting fluid. If liquid or impurities enter the gaps of the turntable, it will seriously affect its service life.

[0003] The shortcomings of existing cradle turntable sealing structures include: a limited number of air curtain inlets (only one or two can be arranged along the circumference), resulting in a significant drop in air curtain pressure far from the inlets, making these areas weak points in the seal; and a simple outer flow channel structure that fails to effectively convert high-pressure liquid into low-pressure liquid, affecting sealing performance. Therefore, for existing cradle-type high-speed turntable sealing structures, when the rotation angle of the cradle swing shaft exceeds 90°, cutting fluid will be directly sprayed onto the seal, exposing the seal to greater pressure and posing a risk of liquid and impurities entering during use. Summary of the Invention

[0004] The purpose of this invention is to provide a cradle-type high-speed turntable sealing device, which solves the problems of unreasonable sealing structure, unreliable sealing, and reduced lifespan of the cradle turntable in the prior art.

[0005] Another objective of this invention is to provide a cradle-type high-speed turntable sealing method, which solves the problem that the existing cradle turntable sealing method is unreasonable, and when the rotation angle of the swing shaft is greater than 90°, the cutting fluid is directly sprayed, which easily carries impurities into the turntable and is difficult to remove.

[0006] The technical solution adopted in this invention is a cradle-type high-speed turntable sealing device, including a sealing seat located in the space formed by the connection of the rotating shaft, the worktable, and the cradle base. The sealing seat is fixedly connected to the cradle base, and is installed with a gap between the sealing seat and the worktable. The sealing seat is also installed at intervals between the sealing seat and the rotating shaft. A drainage channel is radially opened in the outer ring body of the sealing seat. The upper surface of the inner ring of the sealing seat is a recessed step, on which a sealing component and a rotating sealing ring are fitted. The gap between the sealing seat and the worktable is connected to an annular cavity two, which is connected to an annular cavity one. An annular cavity one is connected to an air inlet channel. Annular cavity two is also connected to an air chamber.

[0007] Another technical solution adopted in this invention is a cradle-type high-speed turntable sealing method, which utilizes the aforementioned cradle-type high-speed turntable sealing device and is implemented according to the following steps: Gas enters annular cavity one and annular cavity two through the air intake channel; part of the gas in annular cavity two is blown out through the installation gap between the sealing seat and the worktable, and is transformed into a uniform air curtain in the circumferential direction before the processing operation begins; the other part of the gas flows into the air chamber. After the cradle-type high-speed turntable has been running for a period of time, the processing operation is stopped and the gas supply is stopped. The swing shaft of the cradle turntable is rotated 90° to make the sealing seat vertical. The liquid impurities in the gap between the sealing seat and the worktable enter the drainage channel and the impurity liquid in each drainage channel is discharged in sequence, thus completing the process.

[0008] The beneficial effects of this invention are that an annular sealing cavity and vent are designed in the air curtain flow channel of the cradle turntable to optimize the gas flow path and achieve uniform distribution of air curtain pressure along the turntable direction; a rotating sealing ring is designed in the inner ring of the air curtain to effectively increase the air curtain pressure; and a multi-stage outer layer structure of the air curtain is designed to effectively convert high-pressure direct-injection liquid into low-pressure liquid, thereby improving sealing performance and reducing the risk of liquid penetration. Attached Figure Description

[0009] Figure 1 This is a cross-sectional view of the overall structure of the device of the present invention; Figure 2 This is a partial exploded view of the device of the present invention; Figure 3 This is a schematic diagram of the pore arrangement of the device of the present invention; Figure 4 This is an enlarged view of the drainage unit structure of the device of the present invention; Figure 5 This is an enlarged view of the air intake unit structure of the device of the present invention; Figure 6 This is an enlarged view of the enhanced uniform air curtain structure generated by the device of the present invention.

[0010] In the diagram, 1. Plug 1, 2. Sealing seat, 3. Sealing assembly, 4. Connecting screw, 5. Rotary sealing ring, 6. Sealing ring 1, 7. Rotating shaft, 8. Worktable, 9. Sealing ring 2, 10. Sealing ring 3, 11. Sealing ring 4, 12. Cradle base, 13. Air inlet channel, 14. Annular cavity 1, 15. Air chamber, 16. Annular cavity 2, 17. Groove 1, 18. Protrusion 1, 19. Groove 2, 20. Protrusion 2, 21. Sealing outer edge, 22. Air hole, 23. Plug 2, 24. Drainage channel, 25. Drainage hole 1, 26. Drainage hole 2, 27. Sealing ring 5. Detailed Implementation

[0011] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0012] Reference Figure 1 , Figure 4The structure of the device of the present invention includes a sealing seat 2, which is located in the space formed by the connection of the rotating shaft 7, the worktable 8 and the cradle base 12 of the cradle-type high-speed turntable. The sealing seat 2 is fixedly connected to the cradle base 12 by screws. The sealing seat 2 is installed with a gap between it and the worktable 8 (forming an air curtain). The sealing seat 2 is installed with a gap between it and the rotating shaft 7. Reference Figure 2 , Figure 3 , Figure 4 , Figure 6 The sealing seat 2 is a circular ring. The upper surface of the outer ring of the sealing seat 2 is a stepped shape with varying heights. From the outside to the inside, the upper surface of the outer ring is provided with a sealing outer edge 21, a second protrusion 20, a second groove 19, a first protrusion 18 and a first groove 17. The sealing seat 2 matches the shape of the lower surface of the worktable 8 and makes gap contact through the sealing outer edge 21, the second protrusion 20, the second groove 19, the first protrusion 18 and the first groove 17. The outer ring of the sealing seat 2 has a radially opened drainage channel 24. The outer end outlet of the drainage channel 24 is equipped with a plug 23. The middle section of the drainage channel 24 is connected to the groove 19 through the drainage hole 25. At the same time, the inner section of the drainage channel 24 is also connected to the groove 17 through the drainage hole 26. The plug 23, the drainage channel 24, the drainage hole 25, and the drainage hole 26 form a drainage unit. 3-4 drainage units can be set along the circumference of the sealing seat 2. The upper surface of the inner ring of the sealing seat 2 is a recessed step. A sealing component 3 is fitted on the recessed step of the sealing seat 2. The sealing component 3 is fixed to the sealing seat 2 by screws 4, and the sealing component 3 and the recessed step of the sealing seat 2 maintain a clearance fit. The lower surface of the inner ring of the sealing seat 2 is lower than the mounting surface of the sealing seat 2 and the cradle base 12. The lower surface step of the sealing seat 2 is engaged with the inner step edge of the cradle base 12.

[0013] See Figure 4 , Figure 5 A rotating sealing ring 5 is provided in the space enclosed by the sealing seat 2, the sealing component 3 and the rotating shaft 7. The rotating sealing ring 5 is radially pressed and stuck on the annular step surface formed by the sealing seat 2 and the sealing component 3, while maintaining annular frictional contact with the rotating shaft 7.

[0014] See Figure 4 , Figure 6 The cavity between the sealing component 3, the rotating sealing ring 5, the rotating shaft 7 and the worktable 8 is called the air cavity 15. The space enclosed by the upper surface of the sunken step on the upper surface of the sealing seat 2, the bottom surface and the notch at the lower end of the outer surface of the sealing component 3 is called the annular cavity one 14. The space between the upper groove on the outer surface of the sealing component 3 and the upper surface of the worktable 8 is called the annular cavity two 16. The annular cavity one 14 and the annular cavity two 16 are axially connected by multiple air holes 22, which are evenly distributed along the circumferential direction.

[0015] A sealing ring 6 is provided on the contact surface between the rotating shaft 7 and the worktable 8. The rotating sealing ring 5 and the sealing ring 6 together ensure the airtightness of the air chamber 15.

[0016] A second sealing ring 9 is provided between the vertical surface of the lower step of the sealing seat 2 and the outer vertical surface of the sealing component 3, and a fourth sealing ring 11 is provided between the bottom surface of the lower step of the sealing seat 2 and the lower surface of the sealing component 3. The second sealing ring 9 and the fourth sealing ring 11 together ensure the sealing performance of the annular cavity 14.

[0017] A sealing ring 3 10 is provided between the lower surface of the outer ring of the sealing seat 2 and the contact surface of the cradle base 12 to prevent liquid impurities from entering from the mounting surface of the sealing seat 2 and the cradle base 12.

[0018] See Figure 5 The annular cavity 14 is also connected to multiple air inlet channels 13 (2-3 air inlet channels 13 are provided as needed). The air inlet channel 13 is provided with a sealing ring 27 at the part where the lower surface of the outer ring of the sealing seat 2 contacts the cradle base 12 to ensure the airtightness of the air inlet channel 13. The air inlet channel 13 extends radially out of the outer ring of the sealing seat 2, and the outer end outlet of the air inlet channel 13 is equipped with a plug 1. After the air inlet of the air inlet channel 13 passes through the sealing seat 2 and the main body of the cradle base 12, it is connected to the external gas supply pipe, and the gas at a predetermined pressure is provided by the matching gas supply equipment.

[0019] The working principle of the device of the present invention is as follows: See Figure 6 The contact surface between the sealing seat 2 and the worktable 8 adopts a staggered stepped clearance assembly structure. The upper surface of the sealing seat 2 is respectively provided with a sealing outer edge 21, a second protrusion 20, a second groove 19, a first protrusion 18, and a first groove 17. The lower surface of the worktable 8 is correspondingly provided with stepped contact surfaces of the same shape. During operation, when high-pressure cutting fluid is sprayed onto the sealing outer edge 21, it may carry impurities into the sealing outer edge 21. First, it is blocked by the outer surface of the second protrusion 20, forcing the pressure to decrease before entering the second groove 19. Then, it is blocked by the outer surface of the first protrusion 18. When small impurities reach the first groove 17, the pressure is further reduced. Through this design of multiple blocking and pressure reduction, the pressure of the sprayed high-pressure cutting fluid is significantly reduced, thereby reducing the pressure requirements of the air curtain at the contact surface between the sealing seat 2 and the worktable 8, and effectively improving the sealing performance.

[0020] Two to three air inlet channels 13 are arranged circumferentially in the cradle base 12. Annular cavity one 14 and annular cavity two 16 are axially connected by multiple evenly distributed air holes 22 along the circumferential direction. Gas enters from the air inlet channel 13 and first flows into annular cavity one 14, then through each air hole 22 into annular cavity two 16. A portion of the gas flowing out of annular cavity two 16 is blown outward through groove one 17, protrusion one 18, groove two 19, protrusion two 20, and sealing outer edge 21. Simultaneously, another portion of the gas flows inward into air chamber 15, a sealed cavity where gas flow ceases once a certain pressure is reached. Through this flow channel design, gas enters simultaneously from multiple air inlet channels 13, passing sequentially through annular cavity one 14 and air holes 22 (in this embodiment, each air hole 22 serves as one air inlet path, see...). Figure 3 (This is a bottom view of the sealing assembly 3), which is converted into multiple air intakes and enters the annular cavity 16. In the annular cavity 16, all the air intakes are further evenly distributed and blown outward, forming a uniform and stable air curtain in the circumferential direction. The air chamber 15, which is the gas outlet, is designed as a sealed cavity, which increases the pressure and flow rate of the exhaust air curtain. In addition to sealing the air chamber 15, the rotating sealing ring 5 and the sealing ring 6 also serve as the last sealing guarantee of the sealing assembly 3. Multiple drainage units are evenly distributed along the circumference of the sealing seat 2. When impurities enter the sealing structure after a period of use, the cradle turntable swing shaft is rotated to 90°, and the sealing seat 2 is in a vertical state. This allows the impurities to enter the drainage channel 24 through drainage hole 1 25 and drainage hole 26. When each plug 23 is opened, the impurities will be discharged out of the sealing seat 2 by gravity.

[0021] The method of the present invention, utilizing the sealing device described above, is implemented according to the following steps: In normal working condition, plug 1 and plug 23 are installed (plug 1 and plug 23 are located at different positions on the circumference of sealing seat 2). Figure 4 and Figure 5 (These are schematic diagrams of different cross-sections). Gas at a predetermined pressure is introduced into the intake channel 13. The gas enters from the intake channel 13 and first flows into the annular cavity 14, then through multiple air holes 22 into the annular cavity 26. Part of the gas flowing out of the annular cavity 26 passes through the groove 17, protrusion 18, groove 29, protrusion 20, and sealing outer edge 21 and is blown out, transforming into a uniform air curtain in the circumferential direction. After the air curtain is formed, the cradle-type high-speed turntable begins its processing operation. The other part of the gas flows inward into the air chamber 15. The air chamber 15, as a sealed cavity, stops the gas from flowing in after a certain air pressure is reached. After the cradle-type high-speed turntable has been running for a period of time, the processing operation is stopped and the gas supply is stopped. The swing shaft of the cradle turntable is rotated to 90° so that the sealing seat 2 is in a vertical state. At this time, the liquid impurities left in the gap between the sealing seat 2 and the worktable 8 enter the drainage channel 24 through the drainage hole 1 25 and the drainage hole 26. Each plug 23 is removed, and the impurity liquid will be discharged out of the sealing seat 2 by gravity.

[0022] Example 1 In this embodiment, the cradle turntable of the 600mm worktable five-axis vertical machining center uses the sealing device of the present invention to perform continuous machining of the titanium alloy impeller of the blower.

[0023] The structure of the present invention includes a sealing seat 2, which is located in the space formed by the connection of the rotating shaft 7, the worktable 8, and the cradle base 12 of the cradle-type high-speed turntable. The sealing seat 2 is fixedly connected to the cradle base 12 by screws. The sealing seat 2 is installed with a gap between it and the worktable 8 (forming an air curtain). The sealing seat 2 is also installed with a gap between it and the rotating shaft 7. The sealing seat 2 is an annular body. The upper surface of the outer ring of the sealing seat 2 is stepped with varying heights. From the outside to the inside, the upper surface of the outer ring is provided with a sealing outer edge 21, a second protrusion 20, a second groove 19, a first protrusion 18, and a first groove 17. The sealing seat 2 matches the shape of the lower surface of the worktable 8 and is in gap contact with it through the sealing outer edge 21, the second protrusion 20, the second groove 19, the first protrusion 18, and the first groove 17. The outer ring body of the sealing seat 2 has four drainage units radially opened. The annular cavity 14 is also connected to two air inlet channels 13.

[0024] The processing operation is carried out according to the method of the present invention: gas at a predetermined pressure is introduced into the air intake channel 13. The gas enters the annular cavity 14 through the air intake channel 13 and then enters the annular cavity 26 through eight air holes 22. Part of the gas flowing out of the annular cavity 26 passes through the groove 17, protrusion 18, groove 29, protrusion 20 and sealing outer edge 21 and is blown out, transforming into a uniform air curtain in the circumferential direction. After the air curtain is formed, the processing operation of the cradle-type high-speed turntable begins. Another part of the gas flows into the air chamber 15. The air chamber 15 is a sealed cavity. After a certain air pressure is reached, the gas no longer flows in. After the predetermined time expires, the processing operation is stopped, the gas supply is stopped, and the swing shaft of the cradle turntable is rotated to 90° so that the sealing seat 2 is in a vertical state. At this time, the liquid impurities left in the gap between the sealing seat 2 and the worktable 8 enter the drain channel 24 through the drain hole 1 25 and drain hole 2 26. Each plug 23 is removed, and the impurity liquid will be discharged outside the sealing seat 2 by gravity.

[0025] After a month of continuous processing, it effectively prevented cutting fluid and impurities from entering the cradle, verifying its effectiveness in sealing the turntable under the condition of machining impellers on a 600mm worktable five-axis vertical machining center.

[0026] Example 2 In this embodiment, the cradle turntable of the 600mm worktable five-axis vertical milling and turning composite machining center uses the sealing device of the present invention to perform rough turning of stainless steel high-pressure water pump impeller blanks.

[0027] The structure of the present invention includes a sealing seat 2, which is located in the space formed by the connection of the rotating shaft 7, the worktable 8, and the cradle base 12 of the cradle-type high-speed turntable. The sealing seat 2 is fixedly connected to the cradle base 12 by screws. The sealing seat 2 is installed with a gap between it and the worktable 8 (forming an air curtain). The sealing seat 2 is also installed with a gap between it and the rotating shaft 7. The sealing seat 2 is an annular body. The upper surface of the outer ring of the sealing seat 2 is stepped with varying heights. From the outside to the inside, the upper surface of the outer ring is provided with a sealing outer edge 21, a second protrusion 20, a second groove 19, a first protrusion 18, and a first groove 17. The sealing seat 2 matches the shape of the lower surface of the worktable 8 and is in gap contact with it through the sealing outer edge 21, the second protrusion 20, the second groove 19, the first protrusion 18, and the first groove 17. The outer ring body of the sealing seat 2 has four drainage units radially opened. The annular cavity 14 is also connected to two air inlet channels 13.

[0028] The processing operation is carried out according to the method of the present invention: gas at a predetermined pressure is introduced into the two air inlet channels 13. The gas enters from the air inlet channel 13 and first flows into the annular cavity 14, and then enters the annular cavity 26 through 12 air holes 22; part of the gas flowing out of the annular cavity 26 passes outward through the groove 17, the protrusion 18, the groove 29, the protrusion 20, and the sealing outer edge 21, and is transformed into a uniform air curtain in the circumferential direction. After the air curtain is formed, the processing operation of the cradle-type high-speed turntable begins; the other part... Gas flows into the gas chamber 15, which is a sealed chamber. Once a certain pressure is reached, the gas stops flowing in. After the predetermined time expires, the processing operation is stopped, the gas supply is stopped, and the swing shaft of the cradle turntable is rotated to 90° so that the sealing seat 2 is in a vertical state. At this time, the liquid impurities left in the gap between the sealing seat 2 and the worktable 8 enter the drainage channel 24 through the drainage hole 1 25 and the drainage hole 26. Each plug 23 is removed, and the impurity liquid will be discharged out of the sealing seat 2 by gravity.

[0029] The continuous machining for three weeks effectively prevented cutting fluid and impurities from entering the cradle turntable, verifying its effectiveness in sealing the turntable under high-speed turning impeller conditions in a 600mm worktable five-axis vertical milling and turning composite machining center.

[0030] Example 3 In this embodiment, the sealing device of the present invention is applied to the cradle turntable of the 600mm worktable five-axis horizontal machining center for machining aluminum alloy intake fan discs.

[0031] The structure of this invention includes a sealing seat 2, which is located in the space formed by the connection of the rotating shaft 7, the worktable 8, and the cradle base 12 of the cradle-type high-speed turntable. The sealing seat 2 is fixedly connected to the cradle base 12 by screws. The sealing seat 2 is installed with a gap between it and the worktable 8 (forming an air curtain). The sealing seat 2 is also installed with a gap between it and the rotating shaft 7. The sealing seat 2 is an annular body. The upper surface of the outer ring of the sealing seat 2 is stepped with varying heights. From the outside to the inside, the upper surface of the outer ring is provided with a sealing outer edge 21, a second protrusion 20, a second groove 19, a first protrusion 18, and a first groove 17. The sealing seat 2 matches the shape of the lower surface of the worktable 8 and is in gap contact with it through the sealing outer edge 21, the second protrusion 20, the second groove 19, the first protrusion 18, and the first groove 17. The outer ring of the sealing seat 2 has four drainage units radially opened in the main body. The annular cavity 14 is also connected to two air inlet channels 13. The upper surface of the inner ring of the sealing seat 2 is a recessed step. A sealing component 3 is fitted on the recessed step of the sealing seat 2. The sealing component 3 is fixed to the sealing seat 2 by screws 4, and the sealing component 3 and the recessed step of the sealing seat 2 maintain a clearance fit. The lower surface of the inner ring of the sealing seat 2 is lower than the mounting surface of the sealing seat 2 and the cradle base 12. The lower surface step of the sealing seat 2 is engaged with the inner step edge of the cradle base 12. A rotating sealing ring 5 is provided in the space enclosed by the sealing seat 2, the sealing component 3, and the rotating shaft 7. The rotating sealing ring 5 is radially pressed and clamped on the annular step surface formed by the sealing seat 2 and the sealing component 3, while maintaining annular frictional contact with the rotating shaft 7.

[0032] The processing operation is carried out according to the method of the present invention: gas at a predetermined pressure is introduced into the two air inlet channels 13. The gas enters from the air inlet channel 13 and first flows into the annular cavity 14, and then enters the annular cavity 26 through 12 air holes 22; part of the gas flowing out of the annular cavity 26 passes outward through the groove 17, the protrusion 18, the groove 29, the protrusion 20, and the sealing outer edge 21, and is transformed into a uniform air curtain in the circumferential direction. After the air curtain is formed, the processing operation of the cradle-type high-speed turntable begins; the other part... Gas flows into the gas chamber 15, which is a sealed chamber. Once a certain pressure is reached, the gas stops flowing in. After the predetermined time expires, the processing operation is stopped, the gas supply is stopped, and the swing shaft of the cradle turntable is rotated to 90° so that the sealing seat 2 is in a vertical state. At this time, the liquid impurities left in the gap between the sealing seat 2 and the worktable 8 enter the drainage channel 24 through the drainage hole 1 25 and the drainage hole 26. Each plug 23 is removed, and the impurity liquid will be discharged out of the sealing seat 2 by gravity.

[0033] After a month of continuous processing, it was found that the cutting fluid and impurities could be effectively prevented from entering the cradle turntable, which verified the effectiveness of its sealing on the cradle turntable when machining the intake fan disc on a five-axis horizontal machining center with a 600mm worktable.

[0034] Example 4 In this embodiment, the cradle turntable of the 600mm worktable five-axis vertical machining center uses the sealing device of the present invention to perform dry cutting of gray cast iron gearbox housing.

[0035] The structure of this invention includes a sealing seat 2, which is located in the space formed by the connection of the rotating shaft 7, the worktable 8, and the cradle base 12 of the cradle-type high-speed turntable. The sealing seat 2 is fixedly connected to the cradle base 12 by screws. The sealing seat 2 is installed with a gap between it and the worktable 8 (forming an air curtain), and the sealing seat 2 is installed with a gap between it and the rotating shaft 7. The sealing seat 2 is an annular body. The upper surface of the outer ring of the sealing seat 2 is stepped with varying heights. From the outside to the inside, the upper surface of the outer ring is provided with a sealing outer edge 21, a second protrusion 20, a second groove 19, a first protrusion 18, and a first groove 17. The sealing seat 2 is connected by the sealing outer edge 21, the second protrusion 20, the second groove 19, the first protrusion 18, and the first groove 17. The shape of the sealing seat 2 matches the lower surface of the worktable 8 and is in gap contact with it; three drainage units are radially opened in the outer ring body of the sealing seat 2, and the annular cavity 14 is also connected to two air inlet channels 13; the cavity between the sealing component 3, the rotating sealing ring 5, the rotating shaft 7 and the worktable 8 is called the air cavity 15, and the space enclosed by the vertical and bottom surfaces of the stepped surface of the upper surface of the sealing seat 2 and the notch at the lower end of the outer surface of the sealing component 3 is called the annular cavity 14; the space between the upper groove of the outer surface of the sealing component 3 and the vertical surface of the worktable 8 is called the annular cavity 26, and the annular cavity 14 and the annular cavity 26 are axially connected by 12 air holes 22, which are evenly distributed along the circumference, see Figure 3 The bottom view of sealing assembly 3 is shown; A sealing ring 6 is provided on the contact surface between the rotating shaft 7 and the worktable 8; a sealing ring 9 is provided between the vertical surface of the sinking step of the sealing seat 2 and the outer vertical surface of the sealing component 3; a sealing ring 11 is provided between the bottom surface of the sinking step of the sealing seat 2 and the lower surface of the sealing component 3; and a sealing ring 10 is provided between the lower surface of the outer ring of the sealing seat 2 and the contact surface of the cradle base 12.

[0036] Referring to the method in Example 1, continuous processing for one month effectively prevented impurities and iron filings from entering the cradle turntable, verifying its effectiveness in sealing the cradle turntable under the condition of dry cutting the gearbox housing in a 600mm worktable five-axis vertical machining center.

[0037] Example 5 In this embodiment, the sealing device of the present invention is applied to the cradle turntable of the 1000mm worktable five-axis vertical machining center for machining stainless steel steering knuckles.

[0038] The structure of this invention includes a sealing seat 2, which is located in the space formed by the connection of the rotating shaft 7, the worktable 8, and the cradle base 12 of the cradle-type high-speed turntable. The sealing seat 2 is fixedly connected to the cradle base 12 by screws. The sealing seat 2 is installed with a gap between it and the worktable 8 (forming an air curtain), and the sealing seat 2 is installed with a gap between it and the rotating shaft 7. The sealing seat 2 is an annular body. The upper surface of the outer ring of the sealing seat 2 is stepped with varying heights. From the outside to the inside, the upper surface of the outer ring is provided with a sealing outer edge 21, a second protrusion 20, a second groove 19, a first protrusion 18, and a first groove 17. The sealing seat 2 is connected by the sealing outer edge 21, the second protrusion 20, the second groove 19, the first protrusion 18, and the first groove 17. 7 is in contact with the lower surface of the workbench 8 and has a gap; the outer ring of the sealing seat 2 has three drainage units in the radial direction, and the annular cavity 14 is also connected to two air inlet channels 13; the cavity between the sealing component 3, the rotating sealing ring 5, the rotating shaft 7 and the workbench 8 is called the air cavity 15, and the space enclosed by the upper surface of the sealing seat 2, the bottom surface and the notch at the lower end of the outer surface of the sealing component 3 is called the annular cavity 14; the space between the upper groove of the outer surface of the sealing component 3 and the surface of the workbench 8 is called the annular cavity 26, and the annular cavity 14 and the annular cavity 26 are axially connected by 20 air holes 22, which are evenly distributed along the circumferential direction; A rotating sealing ring 5 is provided in the space enclosed by the sealing seat 2, the sealing component 3, and the rotating shaft 7. The rotating sealing ring 5 is radially pressed and clamped on the annular step surface formed by the sealing seat 2 and the sealing component 3, while maintaining annular frictional contact with the rotating shaft 7.

[0039] Referring to the method in Example 1, continuous processing for one month effectively prevented cutting fluid impurities from entering the cradle turntable, verifying its effectiveness in sealing the cradle turntable under the condition of machining steering knuckles on a 1000mm worktable five-axis vertical machining center.

[0040] Example 6 In this embodiment, the sealing device of the present invention is applied to the cradle turntable of the 500mm worktable five-axis vertical machining center for machining stainless steel turbocharger impellers.

[0041] The structure of this invention includes a sealing seat 2, which is located in the space formed by the connection of the rotating shaft 7, the worktable 8, and the cradle base 12 of the cradle-type high-speed turntable. The sealing seat 2 is fixedly connected to the cradle base 12 by screws. The sealing seat 2 is installed with a gap between it and the worktable 8 (forming an air curtain), and the sealing seat 2 is installed with a gap between it and the rotating shaft 7. The sealing seat 2 is an annular body. The upper surface of the outer ring of the sealing seat 2 is stepped with varying heights. From the outside to the inside, the upper surface of the outer ring is provided with a sealing outer edge 21, a second protrusion 20, a second groove 19, a first protrusion 18, and a first groove 17. The sealing seat 2 is connected by the sealing outer edge 21, the second protrusion 20, the second groove 19, the first protrusion 18, and the first groove 17. 17 is in contact with the lower surface of the workbench 8 with a gap; the outer ring of the sealing seat 2 has three drainage units radially opened, and the annular cavity 14 is also connected to two air inlet channels 13; the cavity between the sealing component 3, the rotating sealing ring 5, the rotating shaft 7 and the workbench 8 is called the air cavity 15; the space enclosed by the upper surface of the sinking step of the sealing seat 2, the bottom surface and the notch at the lower end of the outer surface of the sealing component 3 is called the annular cavity 14; the space between the upper groove of the outer surface of the sealing component 3 and the surface of the workbench 8 is called the annular cavity 26; the annular cavity 14 and the annular cavity 26 are axially connected by 8 air holes 22, which are evenly distributed along the circumference; The annular cavity 14 is also connected to two air inlet channels 13. The air inlet channel 13 is provided with a sealing ring 27 at the contact point between the lower surface of the outer ring of the sealing seat 2 and the cradle base 12 to ensure the airtightness of the air inlet channel 13. The air inlet channel 13 extends radially out of the outer ring of the sealing seat 2, and the outer end outlet of the air inlet channel 13 is equipped with a plug 1. After the air inlet of the air inlet channel 13 passes through the sealing seat 2 and the main body of the cradle base 12, it is connected to an external gas supply pipe, and the gas at a predetermined pressure is provided by the matching gas supply equipment.

[0042] Referring to the method in Example 2, continuous processing for one month effectively prevented impurities and iron filings from entering the cradle turntable, verifying its effectiveness in sealing the cradle turntable under the machining conditions of stainless steel turbocharger impellers on a 500mm worktable five-axis vertical machining center.

Claims

1. A cradle-type high-speed turntable sealing device, characterized in that: The system includes a sealing seat (2), which is located in the space formed by the connection of the rotating shaft (7), the worktable (8), and the cradle base (12). The sealing seat (2) is fixedly connected to the cradle base (12), and the sealing seat (2) is installed with a gap between it and the worktable (8). The sealing seat (2) is also installed with a gap between it and the rotating shaft (7). A drainage channel (24) is radially opened in the outer ring body of the sealing seat (2). The upper surface of the inner ring of the sealing seat (2) is a recessed step, on which a sealing component (3) and a rotating sealing ring (5) are fitted. The gap between the sealing seat (2) and the worktable (8) is connected to the second annular cavity (16), which is connected to the first annular cavity (14). The first annular cavity (14) is connected to an air inlet channel (13). The second annular cavity (16) is also connected to the air chamber (15). The sealing seat (2) is a ring. The outer ring of the sealing seat (2) is provided with a sealing outer edge (21), a second protrusion (20), a second groove (19), a first protrusion (18) and a first groove (17) from the outside to the inside. The sealing seat (2) matches the shape of the lower surface of the workbench (8) and makes gap contact through the sealing outer edge (21), the second protrusion (20), the second groove (19), the first protrusion (18) and the first groove (17). The outer ring of the sealing seat (2) has a drainage channel (24) radially opened. The outer end outlet of the drainage channel (24) is equipped with a plug (23). The middle section of the drainage channel (24) is connected to the groove (19) through the drainage hole (25). The inner section of the drainage channel (24) is also connected to the groove (17) through the drainage hole (26). The plug (23), drainage channel (24), drainage hole (25), and drainage hole (26) form a drainage unit. A rotating sealing ring (5) is provided in the space enclosed by the sealing seat (2), the sealing assembly (3), and the rotating shaft (7). The air cavity (15) refers to the cavity between the sealing assembly (3), the rotating sealing ring (5), the rotating shaft (7), and the worktable (8). A sealing ring 1 (6) is provided on the contact surface between the rotating shaft (7) and the worktable (8); a sealing ring 2 (9) is provided between the vertical surface of the sinking step of the sealing seat (2) and the outer vertical surface of the sealing component (3); a sealing ring 4 (11) is provided between the bottom surface of the sinking step of the sealing seat (2) and the lower surface of the sealing component (3); a sealing ring 3 (10) is provided between the lower surface of the outer ring of the sealing seat (2) and the contact surface of the cradle base (12).

2. The cradle-type high-speed turntable sealing device according to claim 1, characterized in that, The sealing component (3) is fixed on the sealing seat (2), and the sealing component (3) and the recessed step surface of the sealing seat (2) maintain a clearance fit; the lower surface of the inner ring of the sealing seat (2) is lower than the mounting surface of the sealing seat (2) and the cradle base (12), and the lower surface step of the sealing seat (2) is stuck on the inner step edge of the cradle base (12).

3. The cradle-type high-speed turntable sealing device according to claim 1, characterized in that, The annular cavity (14) is formed by the vertical and bottom surfaces of the stepped surface of the upper surface of the sealing seat (2) and the missing corner at the lower end of the outer surface of the sealing assembly (3).

4. The cradle-type high-speed turntable sealing device according to claim 1, characterized in that, The annular cavity 2 (16) refers to the space between the upper groove on the outer surface of the sealing component (3) and the surface of the worktable (8).

5. The cradle-type high-speed turntable sealing device according to claim 1, characterized in that, The annular cavity (14) is also connected to multiple air intake channels (13). A sealing ring (27) is provided at the part where the air intake channel (13) passes through the contact surface between the lower surface of the outer ring of the sealing seat (2) and the cradle base (12). The air intake channel (13) extends radially out of the outer ring of the sealing seat (2) and the outer end outlet of the air intake channel (13) is equipped with a plug (1). After the air intake port of the air intake channel (13) passes through the sealing seat (2) and the main body of the cradle base (12), it is connected to the external air supply pipe.

6. A cradle-type high-speed turntable sealing method, utilizing the cradle-type high-speed turntable sealing device as described in claim 1, characterized in that, Follow these steps: Gas enters annular cavity one (14) and annular cavity two (16) through the air intake channel (13); part of the gas in annular cavity two (16) is blown out through the installation gap between the sealing seat (2) and the worktable (8), and is transformed into a uniform air curtain in the circumferential direction before the processing operation begins; the other part of the gas flows into the air cavity (15). After the cradle-type high-speed turntable has been running for a period of time, the processing operation is stopped and the gas supply is stopped. The swing shaft of the cradle turntable is rotated 90° so that the sealing seat (2) is vertical. The liquid impurities in the gap between the sealing seat (2) and the worktable (8) enter the drain channel (24) and the impurity liquid in each drain channel (24) is discharged in sequence, thus completing the process.

Images