Cradle type high-speed rotary table sealing device and sealing method

Abstract

The invention 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 connecting a rotating shaft, a workbench and a cradle base, the sealing seat is fixedly connected with the cradle base, the sealing seat and the workbench are installed in a clearance mode, and the sealing seat and the rotating shaft are installed in a spaced mode; a liquid discharge channel is radially formed in an outer ring main body of the sealing seat; the upper surface of the inner ring of the sealing seat is a sinking step, and the sinking step is sleeved with a sealing assembly and a rotary sealing ring. A gap between the sealing seat and the workbench is communicated with the second annular cavity, the second annular cavity is communicated with the first annular cavity, and the first annular cavity is communicated with an air inlet channel. And the annular cavity II is additionally communicated with the air cavity. The invention further discloses a cradle type high-speed rotary table sealing method. The invention belongs to the technical field of mechanical sealing equipment, and solves the problems that in the prior art, a cradle rotary table sealing structure is unreasonable in arrangement and unreliable in sealing, and the service life of a cradle rotary table is affected.

Description

Technical Field

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

[0002] The core functional component of the cradle-type five-axis machining center is the cradle turntable. The machine tool usually needs to spray cutting fluid during the parts processing process. Liquid or impurities entering the gap of the turntable will seriously affect its service life.

[0003] The existing cradle-type turntable sealing structure has shortcomings including: a limited number of air curtain inlet holes, with only one or two arranged along the circumference. This results in a significant drop in air curtain pressure away from the inlet, 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. Consequently, with the existing cradle-type high-speed worktable sealing structure, when the cradle's swing axis rotates beyond 90°, cutting fluid is sprayed directly onto the seal, exposing the seal to increased pressure and creating a risk of liquid and impurities entering during use. Summary of the Invention

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

[0005] Another object of the present invention is to provide a cradle-type high-speed turntable sealing method, which solves the problem that the cradle turntable sealing method in the prior art is unreasonable. When the swing shaft rotates at an angle greater than 90°, the cutting fluid is directly sprayed, which easily carries impurities into the turntable and is difficult to eliminate.

[0006] The technical solution adopted by the present invention is a cradle-type high-speed turntable sealing device, including a sealing seat, which is 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, the sealing seat and the worktable are installed in a gap, and the sealing seat and the rotating shaft are installed at intervals; 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 sunken step, and a sealing assembly and a rotating sealing ring are mounted on the sunken step; the gap between the sealing seat and the worktable is connected to annular cavity 2, annular cavity 2 is connected to annular cavity 1, and annular cavity 1 is connected to an air inlet channel; annular cavity 2 is also connected to the air cavity.

[0007] Another technical solution adopted by the present invention is a cradle-type high-speed turntable sealing method, which utilizes the above-mentioned cradle-type high-speed turntable sealing device and is implemented according to the following steps: The gas enters the annular cavity 1 and the annular cavity 2 through the air inlet channel; part of the gas in the annular cavity 2 is blown out through the installation gap between the sealing seat and the workbench, converted into a uniform air curtain in the circumferential direction, and then the processing operation begins; the other part of the gas flows into the air cavity; After the cradle-type high-speed turntable has been running for a period of time, stop the processing operation, stop supplying gas, and rotate the cradle turntable swing axis 90° to make the sealing seat vertical. The liquid impurities in the gap between the sealing seat and the workbench enter the drainage channel, and the impurity liquid in each drainage channel is discharged in turn.

[0008] The beneficial effects of the present invention are as follows: an annular sealing cavity and air vents are designed in the air curtain flow channel of the cradle turntable to optimize the gas flow path and achieve uniform distribution of the air curtain pressure along the turntable direction; a rotating sealing ring is designed on the inner ring of the air curtain to effectively increase the air curtain pressure; a multi-stage air curtain outer layer structure is designed to effectively convert high-pressure direct injection liquid into low-pressure liquid, thereby improving the sealing performance and reducing the risk of liquid penetration. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a cross-sectional view of the overall structure of the device of the present invention; Figure 2 It is a partial structural exploded diagram of the device of the present invention; Figure 3 Schematic diagram of the arrangement of pores in the device of the present invention; Figure 4 This is an enlarged view of the structure of the liquid discharge unit 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 It is an enlarged view of the structure of the enhanced uniform air curtain produced by the device of the present invention.

[0010] In the figure, 1. Plug 1, 2. Sealing seat, 3. Sealing assembly, 4. Connecting screw, 5. Rotating sealing ring, 6. Sealing ring 1, 7. Rotating shaft, 8. Workbench, 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 cavity, 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 DESCRIPTION

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

[0012] Reference Figure 1 、 Figure 4The structure of the device of the present invention is as follows: the sealing seat 2 is located in the space formed by the rotation shaft 7, the workbench 8 and the cradle base 12 of the cradle-type high-speed turntable, and the sealing seat 2 is fixedly connected to the cradle base 12 by screws. The sealing seat 2 is installed with a gap between the workbench 8 (forming an air curtain), and the sealing seat 2 is installed with an interval between the rotation shaft 7; Reference Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 The sealing seat 2 is a circular ring, and the upper surface of the outer ring of the sealing seat 2 is a stepped shape with varying heights. 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 in sequence from the outside to the inside. The sealing seat 2 is in conformity with the lower surface of the workbench 8 through the sealing outer edge 21, the second protrusion 20, the second groove 19, the first protrusion 18 and the first groove 17, and has clearance contact; A drainage channel 24 is radially formed in the outer ring body of the sealing seat 2. A second plug 23 is provided at the outer end of the drainage channel 24. The middle section of the drainage channel 24 communicates with the second groove 19 via a first drainage hole 25. The inner section of the drainage channel 24 also communicates with the first groove 17 via a second drainage hole 26. The second plug 23, drainage channel 24, first drainage hole 25, and second drainage hole 26 form a drainage unit. Three to four drainage units may be provided along the circumference of the sealing seat 2. The upper surface of the inner ring of the sealing seat 2 is a sunken step, and a sealing component 3 is mounted on the sunken 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 maintains a clearance fit with the vertical surface of the sunken step of the sealing seat 2; 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.

[0013] See Figure 4 、 Figure 5 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. That is, the rotating sealing ring 5 is clamped on the annular step surface formed by the sealing seat 2 and the sealing assembly 3 through radial extrusion while maintaining annular friction 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 workbench 8 is called the air cavity 15, and the space enclosed by the vertical surface and bottom surface of the sunken step on the upper surface of the sealing seat 2 and the missing corner at the lower end of the outer facade of the sealing component 3 is called the annular cavity 14; the space between the upper groove on the outer facade of the sealing component 3 and the vertical surface of the workbench 8 is called the annular cavity 2 16, and the annular cavity 14 and the annular cavity 2 16 are axially connected by a plurality of air holes 22, and the plurality of air holes 22 are evenly distributed along the circumferential direction.

[0015] The contact surface between the rotating shaft 7 and the workbench 8 is provided with a sealing ring 6 , and the rotating sealing ring 5 and the sealing ring 6 together ensure the sealing of the air cavity 15 .

[0016] A sealing ring 2 9 is arranged between the vertical surface of the sunken step of the sealing seat 2 and the outer vertical surface of the sealing component 3, and a sealing ring 4 11 is arranged between the bottom surface of the sunken step of the sealing seat 2 and the lower surface of the sealing component 3. The sealing ring 2 9 and the sealing ring 4 11 jointly ensure the sealing of the annular cavity 14.

[0017] 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 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 set as needed). A sealing ring 5 27 is provided at the portion where the air inlet 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 to ensure the sealing of the air inlet channel 13; the air inlet channel 13 radially passes through the outer ring body of the sealing seat 2, and the outer end outlet of the air inlet channel 13 is provided 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 pipe, and gas of a predetermined pressure is provided by the matching gas transmission equipment.

[0019] The working principle of the device of the present invention is: See Figure 6 The contact surface between the sealing seat 2 and the workbench 8 adopts a staggered step gap 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 workbench 8 is correspondingly provided with a step contact surface of corresponding shape. During operation, high-pressure cutting fluid is sprayed onto the sealing outer edge 21, which may carry impurities into the sealing outer edge 21. It is first blocked by the outer surface of the second protrusion 20, forcing the pressure to drop before entering the second groove 19. Then, it is blocked by the outer surface of the first protrusion 18. When the fine impurities reach the first groove 17, the pressure is further reduced. Through this multiple blocking and pressure reduction design, the pressure of the sprayed high-pressure cutting fluid is significantly reduced, thereby reducing the pressure requirement for the air curtain at the contact surface between the sealing seat 2 and the workbench 8, effectively improving the sealing performance.

[0020] Two to three air inlet channels 13 are provided along the circumferential direction in the cradle base 12. The annular cavity 14 and the annular cavity 2 16 are axially connected through a plurality of air holes 22 evenly distributed along the circumferential direction. After entering the air inlet channel 13, the gas first flows into the annular cavity 14, and then enters the annular cavity 2 16 through each air hole 22; a portion of the gas flowing out of the annular cavity 2 16 is blown outward through the groove 17, the protrusion 18, the groove 2 19, the protrusion 2 20, and the sealing outer edge 21. At the same time, another portion of the gas flows inward into the air cavity 15. The air cavity 15 is a sealed cavity. After reaching a certain air pressure, the gas no longer flows in. Through this flow channel design, the gas enters from multiple air inlet channels 13 at the same time, passes through the annular cavity 14 and the air holes 22 in turn (in the embodiment, each air hole 22 serves as an air inlet, see Figure 3 , which is a bottom view of the sealing assembly 3), is converted into multi-path air intake and enters the annular cavity 16. Within the annular cavity 16, all the intake air is further evenly distributed and blown outward, forming a uniform and stable air curtain in the circumferential direction; the air cavity 15 where the gas exits inward is designed as a sealed cavity, which increases the pressure and flow of the discharged air curtain; the rotating sealing ring 5 and the sealing ring 1 6 not only seal the air cavity 15, but also serve as the final sealing guarantee of the sealing assembly 3; Multiple drainage units are evenly distributed along the circumferential direction of the sealing seat 2. When impurities enter the sealing structure after a period of use, the cradle turntable swing axis is rotated 90°, and the sealing seat 2 is in a vertical state, so that the liquid impurities enter the drainage channel 24 through drainage hole 1 25 and drainage hole 2 26. The plugs 2 23 are opened, and the impurities are discharged from the sealing seat 2 under the action of gravity.

[0021] The method of the present invention is implemented by using the sealing device of the present invention according to the following steps: In normal working state, install plug 1 and plug 2 23 (plug 1 and plug 2 23 are set at different positions of the circumference of the sealing seat 2, Figure 4 and Figure 5 ( Schematic diagrams of structures with different cross-sections) Gas at a predetermined pressure is introduced into the air inlet channel 13. The gas enters the air inlet channel 13 and first flows into the annular cavity 14, then enters the annular cavity 2 16 through the plurality of air holes 22. A portion of the gas flowing out of the annular cavity 16 is blown outward through the groove 17, the protrusion 18, the groove 29, the protrusion 20, and the sealing outer edge 21, 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. The other portion of the gas flows inward into the air cavity 15. The air cavity 15 acts as a sealed cavity and no gas flows in after reaching a certain pressure. After the cradle-type high-speed turntable has been running for a period of time, the processing operation is stopped, the gas supply is stopped, and the swing axis of the cradle turntable is rotated 90° so that the sealing seat 2 is in a vertical state. At this time, the liquid impurities retained in the gap between the sealing seat 2 and the workbench 8 enter the drainage channel 24 through the drainage hole 1 25 and the drainage hole 2 26. The plugs 2 23 are removed respectively, and the impurity liquid will be discharged from the sealing seat 2 under the action of gravity.

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

[0023] The structure of the present invention is as follows: it includes a sealing seat 2, which is located in the space formed by the connection of the rotating shaft 7, the workbench 8 and the cradle base 12 of the cradle-type high-speed turntable, and the sealing seat 2 is fixedly connected to the cradle base 12 by screws, the sealing seat 2 and the workbench 8 are installed with a gap (forming an air curtain), and the sealing seat 2 and the rotating shaft 7 are installed with intervals; the sealing seat 2 is a circular ring body, and the upper surface of the outer ring of the sealing seat 2 is a step-shaped with varying heights. The upper surface of the outer ring is sequentially provided with a sealing outer edge 21, a protrusion 20, a groove 29, a protrusion 18 and a groove 17 from the outside to the inside. The sealing seat 2 is matched with the shape of the lower surface of the workbench 8 through the sealing outer edge 21, the protrusion 20, the groove 2 19, the protrusion 18 and the groove 17, and is in gap contact with the lower surface of the workbench 8; four 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.

[0024] The processing operation is carried out according to the method of the present invention: gas of a predetermined pressure is introduced into the air inlet channel 13, and the gas enters the air inlet channel 13 and first flows into the annular cavity 14, and then enters the annular cavity 2 16 through the eight air holes 22; a part of the gas flowing out of the annular cavity 2 16 is blown out outward through the groove 17, the protrusion 18, the groove 2 19, the protrusion 2 20, and the sealing outer edge 21, and is converted 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 is started; the other part of the gas flows inward into the air cavity 15, and the air cavity 15 serves as a sealed cavity and no gas will flow into it after reaching a certain air pressure; after the predetermined expiration, the processing operation is stopped, the gas is stopped, and the swing axis of the cradle turntable is rotated 90° so that the sealing seat 2 is in a vertical state. At this time, the liquid impurities retained in the gap between the sealing seat 2 and the workbench 8 enter the drainage channel 24 through the drainage hole 1 25 and the drainage hole 2 26, and the plugs 2 23 are removed respectively, and the impurity liquid will be discharged from the sealing seat 2 under the action of gravity.

[0025] One month of continuous machining was able to effectively prevent cutting fluid and impurities from entering the cradle, verifying its effectiveness in sealing the turntable when machining impellers on a five-axis vertical machining center with a 600mm worktable.

[0026] Example 2 The 600mm worktable of the five-axis vertical milling and turning compound machining center cradle turntable of this embodiment 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 is as follows: it includes a sealing seat 2, which is located in the space formed by the connection of the rotating shaft 7, the workbench 8 and the cradle base 12 of the cradle-type high-speed turntable, and the sealing seat 2 is fixedly connected to the cradle base 12 by screws, the sealing seat 2 and the workbench 8 are installed with a gap (forming an air curtain), and the sealing seat 2 and the rotating shaft 7 are installed with intervals; the sealing seat 2 is a circular ring body, and the upper surface of the outer ring of the sealing seat 2 is a step-shaped with varying heights. The upper surface of the outer ring is sequentially provided with a sealing outer edge 21, a protrusion 20, a groove 29, a protrusion 18 and a groove 17 from the outside to the inside. The sealing seat 2 is matched with the shape of the lower surface of the workbench 8 through the sealing outer edge 21, the protrusion 20, the groove 2 19, the protrusion 18 and the groove 17, and is in gap contact with the lower surface of the workbench 8; four 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.

[0028] According to the method of the present invention, the processing operation is carried out as follows: gas of predetermined pressure is introduced into the two air inlet channels 13. The gas enters the air inlet channel 13 and first flows into the annular cavity 14, and then enters the annular cavity 2 16 through the 12 air holes 22; a part of the gas flowing out of the annular cavity 2 16 is blown outward through the groove 17, the protrusion 18, the groove 2 19, the protrusion 2 20, and the sealing outer edge 21, and is converted 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 of the gas flows out of the annular cavity 2 16 and is blown out through the groove 17, the protrusion 18, the groove 2 19, the protrusion 2 20, and the sealing outer edge 21, and is converted 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 gas flows inwardly into the air cavity 15, and the air cavity 15 serves as a sealed cavity and no gas will flow in after reaching a certain air pressure; after the predetermined period expires, the processing operation is stopped, the gas supply is stopped, and the swing axis of the cradle turntable is rotated 90° so that the sealing seat 2 is in a vertical state. At this time, the liquid impurities retained in the gap between the sealing seat 2 and the workbench 8 enter the drainage channel 24 through the drainage hole 1 25 and the drainage hole 2 26. The plugs 2 23 are removed respectively, and the impurity liquid will be discharged from the sealing seat 2 under the action of gravity.

[0029] Three weeks of continuous machining were able to effectively prevent cutting fluid and impurities from entering the cradle turntable, verifying its effectiveness in sealing the turntable under high-speed impeller turning conditions on a five-axis vertical milling and turning machining center with a 600mm worktable.

[0030] Example 3 The 600 mm worktable five-axis horizontal machining center cradle turntable of this embodiment uses the sealing device of the present invention to process aluminum alloy air intake fan disks.

[0031] The structure of the present invention is as follows: it includes a sealing seat 2, which is located in the space formed by the connection of the rotating shaft 7, the workbench 8 and the cradle base 12 of the cradle-type high-speed turntable, and the sealing seat 2 is fixedly connected to the cradle base 12 by screws. The sealing seat 2 and the workbench 8 are installed with a gap (forming an air curtain), and the sealing seat 2 and the rotating shaft 7 are installed with an interval; the sealing seat 2 is a circular ring body, and the upper surface of the outer ring of the sealing seat 2 is a stepped shape with varying heights. The upper surface of the outer ring is sequentially 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 is matched with the lower surface of the workbench 8 through the sealing outer edge 21, the second protrusion 20, the second groove 19, the first protrusion 18 and the first groove 17, and is in gap contact with the lower surface of the workbench 8; four 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 upper surface of the inner ring of the sealing seat 2 is a sunken step, and a sealing assembly 3 is mounted on the sunken step of the sealing seat 2. The sealing assembly 3 is fixed to the sealing seat 2 by screws 4, and the sealing assembly 3 maintains a clearance fit with the vertical surface of the sunken step of the sealing seat 2. 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. 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. That is, the rotating sealing ring 5 is clamped on the annular step surface formed by the sealing seat 2 and the sealing assembly 3 by radial extrusion while maintaining annular friction contact with the rotating shaft 7.

[0032] According to the method of the present invention, the processing operation is carried out as follows: gas of predetermined pressure is introduced into the two air inlet channels 13. The gas enters the air inlet channel 13 and first flows into the annular cavity 14, and then enters the annular cavity 2 16 through the 12 air holes 22; a part of the gas flowing out of the annular cavity 2 16 is blown outward through the groove 17, the protrusion 18, the groove 2 19, the protrusion 2 20, and the sealing outer edge 21, and is converted 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 of the gas flows out of the annular cavity 2 16 and is blown out through the groove 17, the protrusion 18, the groove 2 19, the protrusion 2 20, and the sealing outer edge 21, and is converted 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 gas flows inwardly into the air cavity 15, and the air cavity 15 serves as a sealed cavity and no gas will flow in after reaching a certain air pressure; after the predetermined period expires, the processing operation is stopped, the gas supply is stopped, and the swing axis of the cradle turntable is rotated 90° so that the sealing seat 2 is in a vertical state. At this time, the liquid impurities retained in the gap between the sealing seat 2 and the workbench 8 enter the drainage channel 24 through the drainage hole 1 25 and the drainage hole 2 26. The plugs 2 23 are removed respectively, and the impurity liquid will be discharged from the sealing seat 2 under the action of gravity.

[0033] After one month of continuous machining, it can effectively prevent cutting fluid and impurities from entering the cradle turntable, verifying its effectiveness in sealing the cradle turntable when machining the air intake fan disc on a five-axis horizontal machining center with a 600mm worktable.

[0034] Example 4 The sealing device of the present invention is applied to the cradle turntable of the five-axis vertical machining center with a 600 mm worktable surface in this embodiment to perform dry cutting of the gray cast iron gearbox housing.

[0035] The structure of the present invention is as follows: it includes a sealing seat 2, which is located in the space formed by the connection of the rotating shaft 7, the workbench 8 and the cradle base 12 of the cradle-type high-speed turntable, and the sealing seat 2 is fixedly connected to the cradle base 12 by screws. The sealing seat 2 and the workbench 8 are installed with a gap (forming an air curtain), and the sealing seat 2 and the rotating shaft 7 are installed at intervals; the sealing seat 2 is a circular ring body, and the upper surface of the outer ring of the sealing seat 2 is a step-shaped with different heights. The upper surface of the outer ring is sequentially 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 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. It matches the shape of the lower surface of the workbench 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 workbench 8 is called the air cavity 15, and the space enclosed by the vertical surface and the bottom surface of the sunken step on the upper surface of the sealing seat 2 and the missing corner 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 workbench 8 is called the annular cavity 2 16, and the annular cavity 14 and the annular cavity 2 16 are axially connected with 12 air holes 22, and the 12 air holes 22 are evenly distributed along the circumferential direction. Figure 3 As shown in the bottom view of the sealing assembly 3; A sealing ring 6 is provided on the contact surface between the rotating shaft 7 and the workbench 8; a sealing ring 2 9 is provided between the vertical surface of the sunken step of the sealing seat 2 and the outer vertical surface of the sealing component 3, and a sealing ring 4 11 is provided between the bottom surface of the sunken 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.

[0036] Referring to the method of Example 1, continuous processing for one month can effectively prevent impurity iron chips from entering the cradle turntable, verifying its effectiveness in sealing the cradle turntable under the working conditions of dry cutting gearbox housing on a five-axis vertical machining center with a 600mm worktable.

[0037] Example 5 The 1000 mm worktable surface of the five-axis vertical machining center cradle turntable of this embodiment uses the sealing device of the present invention to process stainless steel steering knuckles.

[0038] The structure of the present invention is as follows: it includes a sealing seat 2, which is located in the space formed by the connection of the rotating shaft 7, the workbench 8 and the cradle base 12 of the cradle-type high-speed turntable, and the sealing seat 2 is fixedly connected to the cradle base 12 by screws. The sealing seat 2 and the workbench 8 are installed with a gap (forming an air curtain), and the sealing seat 2 and the rotating shaft 7 are installed at intervals; the sealing seat 2 is a circular ring body, and the upper surface of the outer ring of the sealing seat 2 is a step-shaped with different heights. The upper surface of the outer ring is sequentially 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 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. 7 matches the shape of the lower surface of the workbench 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 workbench 8 is called the air cavity 15, and the space enclosed by the vertical surface and bottom surface of the sunken step on 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 workbench 8 is called the annular cavity 2 16, and the annular cavity 14 and the annular cavity 2 16 are axially connected by 20 air holes 22, and the 20 air holes 22 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 assembly 3 and the rotating shaft 7. That is, the rotating sealing ring 5 is clamped on the annular step surface formed by the sealing seat 2 and the sealing assembly 3 by radial extrusion while maintaining annular friction contact with the rotating shaft 7.

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

[0040] Example 6 The 500 mm worktable five-axis vertical machining center cradle turntable of this embodiment uses the sealing device of the present invention to process stainless steel turbocharged impellers.

[0041] The structure of the present invention is as follows: it includes a sealing seat 2, which is located in the space formed by the connection of the rotating shaft 7, the workbench 8 and the cradle base 12 of the cradle-type high-speed turntable, and the sealing seat 2 is fixedly connected to the cradle base 12 by screws, the sealing seat 2 and the workbench 8 are installed with a gap (forming an air curtain), and the sealing seat 2 and the rotating shaft 7 are installed at intervals; the sealing seat 2 is a circular ring body, and the upper surface of the outer ring of the sealing seat 2 is a step-shaped with different heights. The upper surface of the outer ring is sequentially 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 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. 17 matches the shape of the lower surface of the workbench 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 workbench 8 is called the air cavity 15, and the space enclosed by the vertical surface and bottom surface of the sunken step on the upper surface of the sealing seat 2 and the missing corner 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 workbench 8 is called the annular cavity 2 16, and the annular cavity 14 and the annular cavity 2 16 are axially connected by eight air holes 22, and the eight air holes 22 are evenly distributed along the circumferential direction; The annular cavity 14 is also connected to two air inlet channels 13. A sealing ring 5 27 is provided at the portion where the air inlet 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 to ensure the sealing of the air inlet channel 13. The air inlet channel 13 radially passes through the outer ring body of the sealing seat 2, and the outer end outlet of the air inlet channel 13 is provided 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 pipe, and gas of a predetermined pressure is provided by the matching gas transmission equipment.

[0042] Referring to the method of Example 2, continuous processing for one month can effectively prevent impurity iron chips from entering the cradle turntable, verifying its effectiveness in sealing the cradle turntable under the processing conditions of stainless steel turbocharged impellers processed by a five-axis vertical machining center with a 500mm worktable.

Claims

1. Cradle-type high-speed turntable sealing device, characterized by: The invention comprises a sealing seat (2), the sealing seat (2) being located in a space formed by connecting the rotating shaft (7), the workbench (8) and the cradle base (12), the sealing seat (2) being fixedly connected to the cradle base (12), the sealing seat (2) being installed with a gap between the working table (8), and the sealing seat (2) being installed with a gap between the rotating shaft (7); a drainage channel (24) being radially opened in the outer ring body of the sealing seat (2); an inner ring upper surface of the sealing seat (2) being a sunken step, on which a sealing assembly (3) and a rotating sealing ring (5) are mounted; a gap between the sealing seat (2) and the workbench (8) being communicated with an annular cavity 2 (16), the annular cavity 2 (16) being communicated with an annular cavity 1 (14), the annular cavity 1 (14) being communicated with an air inlet channel (13); and the annular cavity 2 (16) being further communicated with an air cavity (15).

2. The cradle-type high-speed turntable sealing device according to claim 1, characterized in that: The sealing seat (2) is a circular ring, and the upper surface of 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) in sequence from the outside to the inside. The sealing seat (2) is matched with the lower surface of the workbench (8) in shape and has gap contact with the sealing outer edge (21), the second protrusion (20), the second groove (19), the first protrusion (18) and the first groove (17).

3. The cradle-type high-speed turntable sealing device according to claim 1, characterized in that: A drainage channel (24) is radially opened in the outer ring body of the sealing seat (2), and a second plug (23) is provided at the outer end outlet of the drainage channel (24). The middle section of the drainage channel (24) is connected to the second groove (19) through the first drainage hole (25), and the inner section of the drainage channel (24) is also connected to the first groove (17) through the second drainage hole (26). The second plug (23), the drainage channel (24), the first drainage hole (25), and the second drainage hole (26) form a drainage unit.

4. The cradle-type high-speed turntable sealing device according to claim 1, characterized in that: The sealing assembly (3) is fixed on the sealing seat (2), and the sealing assembly (3) maintains a clearance fit with the vertical surface of the sunken step of the sealing seat (2); 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).

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

6. The cradle-type high-speed turntable sealing device according to claim 1, characterized in that: A rotating seal ring (5) is provided in the space enclosed by the sealing seat (2), the sealing assembly (3) and the rotating shaft (7), and the air cavity (15) refers to the cavity between the sealing assembly (3), the rotating seal ring (5), the rotating shaft (7) and the workbench (8).

7. 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 of the outer facade of the sealing component (3) and the facade of the workbench (8).

8. The cradle-type high-speed turntable sealing device according to claim 1, characterized in that: The contact surface between the rotating shaft (7) and the workbench (8) is provided with a sealing ring 1 (6); 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); and 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).

9. The cradle-type high-speed turntable sealing device according to claim 1, characterized in that: The annular cavity (14) is also connected to a plurality of air inlet channels (13), and a sealing ring (27) is provided at a portion where the air inlet channels (13) pass through the contact surface between the lower surface of the outer ring of the sealing seat (2) and the cradle base (12); The air inlet channel (13) passes through the outer ring body of the sealing seat (2) in the radial direction, and the outer end outlet of the air inlet channel (13) is provided with a plug (1). The air inlet of the air inlet channel (13) passes through the sealing seat (2) and the main body of the cradle base (12) and is connected to the external air supply pipe.

10. A cradle-type high-speed turntable sealing method, using the cradle-type high-speed turntable sealing device according to claim 1, characterized in that: Follow these steps to implement: The gas enters the annular cavity 1 (14) and the annular cavity 2 (16) through the air inlet channel (13); a portion of the gas in the annular cavity 2 (16) is blown out through the installation gap between the sealing seat (2) and the workbench (8), and is converted into a uniform air curtain in the circumferential direction, and then the processing operation begins; the other portion 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, the gas supply is stopped, and the swing axis of the cradle turntable is rotated 90 degrees to make the sealing seat (2) vertical. The liquid impurities in the gap between the sealing seat (2) and the workbench (8) enter the drainage channel (24), and the impurity liquid in each drainage channel (24) is discharged in turn.

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