Sealing structure of rotary table

Abstract

The utility model discloses a sealing structure of a rotary table, and belongs to the technical field of rotary table sealing. The sealing device comprises a workbench, a rotary table and a sealing assembly, the rotary table is inserted into the workbench to form an annular gap, and the sealing assembly is arranged in the annular gap. The sealing assembly comprises an air injection unit and a sealing unit which are arranged in the workbench, the sealing unit comprises a sealing ring, and the sealing ring is arranged in the annular gap and blocks a lower end opening of the annular gap; a plurality of air injection grooves are formed in the top of the workbench relative to the annular gap, the air injection grooves are arranged in the radial direction of the workbench, and the air injection grooves can inject air into the annular gap to prevent sundries from entering the annular gap from the upper end opening of the annular gap and abut against the sealing ring located at the lower end opening of the annular gap. High-pressure air can be sprayed into the annular gap, so that impurities are prevented from entering the annular gap from the opening in the upper end of the annular gap, and the interior of the annular gap is kept relatively clean.

Description

Technical Field

[0001] The utility model relates to the technical field of turntable sealing, in particular to a sealing structure of a turntable. Background Art

[0002] A direct drive turntable generally consists of a frameless direct drive motor that outputs driving torque, bearings, a workbench, and a turntable. The turntable is installed in the workbench through bearings, and the frameless direct drive motor can drive the turntable to rotate relative to the workbench.

[0003] Generally speaking, there is an annular gap between the turntable and the workbench. The sealing between the stationary workbench and the relatively rotating turntable is not tight, making it easy for water, cutting chips, and dust to enter, and the service life is relatively short. Summary of the Utility Model

[0004] In view of this, it is necessary to provide a sealing structure for a turntable to solve the problem of poor sealing between the existing turntable and the workbench.

[0005] The utility model provides a sealing structure of a turntable, including a workbench and a turntable. The turntable is inserted into the workbench to form an annular gap. The sealing structure further includes a sealing component disposed in the annular gap. The sealing component includes a jetting unit and a sealing unit disposed in the workbench. The sealing unit includes a sealing ring. The sealing ring is disposed in the annular gap to block the lower opening of the annular gap. A plurality of jetting grooves are provided on the top of the workbench opposite to the annular gap. The jetting grooves are arranged along the radial direction of the workbench. The jetting grooves can jet air into the annular gap to prevent debris from entering through the upper opening of the annular gap and press against the sealing ring located at the lower opening of the annular gap.

[0006] Further, the cross-section of the jetting groove is gradually expanded from the inside of the workbench to the outside, and one side of the jetting groove is communicated with the annular gap.

[0007] Further, a plurality of the jetting grooves are equidistantly spaced along the central axis of the workbench. The plurality of jetting grooves jet air outwards to form a barrier to prevent debris from invading.

[0008] Further, at least two groups of sealing grooves are provided on the inner side of the workbench. The outer ring of the sealing ring is embedded in the sealing grooves, and the inner ring of the sealing ring abuts against the turntable through the annular gap.

[0009] Further, a friction sleeve is provided on the inner ring of the sealing ring, and the friction sleeve abuts against the turntable.

[0010] Further, the cross-section of the sealing ring is relatively bent, and the inner and outer rings of the sealing ring are elastically abutted against the sealing groove and the turntable respectively, and the sealing ring can automatically compensate for the wear of the friction sleeve.

[0011] Further, the sealing groove communicates with the annular gap, and high-pressure air can act on the sealing ring to drive the sealing ring to abut tightly against the sealing groove and the turntable.

[0012] Further, the sealing assembly further includes an air delivery unit, and the air delivery unit includes an annular pipe body embedded in the workbench, and each air jet groove communicates with the annular pipe body, and the annular pipe body can provide high-pressure gas to the air jet groove.

[0013] Further, a communication hole is formed in the air jet groove body, and the communication hole communicates with the annular pipe body.

[0014] Further, the air delivery unit further includes a gas supply joint, and the gas supply joint communicates with the annular pipe body to supply high-pressure gas to the annular pipe body.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] A sealing structure of a turntable of the present utility model is provided with a sealing assembly, and the sealing assembly includes an air jet unit and a sealing unit arranged in the workbench. The sealing unit includes a sealing ring, and the sealing ring is arranged in the annular gap and can block the lower opening of the annular gap to prevent external moisture and sundries from invading. A plurality of air jet groove bodies are arranged on the top of the workbench opposite to the annular gap, and the air jet groove bodies are arranged along the radial direction of the workbench. The air jet groove bodies can spray air into the annular gap, and the sprayed air can be ejected from the upper opening of the annular gap, thereby preventing sundries from entering through the upper opening of the annular gap and keeping the inside of the annular gap relatively clean. Spraying gas into the annular gap can increase the pressure in the annular gap and form a positive pressure relative to the outside, pressing the sealing ring located at the lower opening of the annular gap and improving the sealing effect of the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present utility model and constitute a part of this application. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0018] Figure 1 is a schematic structural diagram of the whole of the present utility model;

[0019] Figure 2 is a schematic structural diagram of the workbench in the present utility model;

[0020] Figure 3 is Figure 1 a partial enlarged structural schematic diagram of part A;

[0021] Figure 4 is a structural schematic diagram of the sealing ring in the present utility model.

[0022] In the figure, 100 is the workbench;

[0023] 200 is the turntable;

[0024] 300 is the sealing assembly; 310 is the air jet unit; 311 is the air jet groove body; 311a is the communication hole; 320 is the sealing unit; 321 is the sealing ring; 321a is the friction sleeve; 322 is the sealing groove; 330 is the air delivery unit; 331 is the annular pipe body; 332 is the air supply joint. Specific embodiments

[0025] The following will specifically describe the preferred embodiments of the present utility model in conjunction with the drawings. Among them, the drawings form a part of this application and are used together with the embodiments of the present utility model to explain the principle of the present utility model, and are not used to limit the scope of the present utility model.

[0026] A sealing structure of a turntable in this embodiment relates to the technical field of turntable sealing. The sealing assembly 300 is used to input external gas into the annular gap between the workbench 100 and the turntable 200. The air flow can not only prevent external sundries from entering the annular gap, but also enhance the sealing performance of the sealing ring located in the annular gap.

[0027] Please refer to Figures 1 to 4 , a sealing structure of a turntable in this embodiment includes a workbench 100, a turntable 200 and a sealing assembly 300. The turntable 200 is inserted into the workbench 100 to form an annular gap. The sealing assembly 300 is arranged in the annular gap. The sealing assembly 300 can prevent external sundries from entering the annular gap, prevent the sundries from wearing the workbench 100 and the turntable 200, and shorten the service life of the equipment.

[0028] The sealing assembly 300 includes a jetting unit 310 disposed in the workbench 100 and a sealing unit 320. The sealing unit 320 includes a sealing ring 321. The sealing ring 321 is disposed in the annular gap and can block the lower opening of the annular gap, preventing external moisture and debris from intruding. A plurality of jetting grooves 311 are provided on the top of the workbench 100 opposite to the annular gap. The jetting grooves 311 are arranged along the radial direction of the workbench 100. The jetting grooves 311 can jet air into the annular gap, and the jetted air can be ejected from the upper opening of the annular gap, thereby preventing debris from entering through the upper opening of the annular gap and keeping the inside of the annular gap relatively clean. Jetting gas into the annular gap can increase the pressure in the annular gap and form a positive pressure relative to the outside, pressing the sealing ring 321 at the lower opening of the annular gap and improving the sealing effect of the sealing ring 321.

[0029] In some embodiments, referring to Figure 2 , the cross-section of the jetting groove 311 is gradually expanded from the inside of the workbench 100 to the outside. The cross-section of the jetting groove 311 gradually expands from the inside of the workbench 100 to the outside, which helps to gradually reduce the pressure loss of the air flow, enabling the air flow to be ejected smoothly from the jetting groove 311. The larger outlet area allows the air flow to have a wider coverage range in the annular gap, effectively blocking debris from entering the annular gap.

[0030] The cross-section of the jetting groove 311 can be rectangular or semi-circular, which is not only simple to process but also can be gradually expanded along the radial direction of the workbench 100.

[0031] A plurality of jetting grooves 311 are equidistantly spaced along the central axis. The plurality of jetting grooves 311 jet air outward to ensure that the air flow is evenly distributed around the annular gap. The evenly distributed jetting grooves 311 can form a continuous air flow barrier over the entire annular gap, effectively covering all possible debris entry paths. The air flow barrier is relatively continuous and dense, greatly reducing the possibility of external water, cutting chips, and dust entering the annular gap.

[0032] In some embodiments, referring to Figure 3 and Figure 4 , at least two sets of sealing grooves 322 are provided on the inner side of the workbench 100. Each set of sealing grooves 322 can provide a layer of sealing, enhancing the sealing effect. The multiple sets of sealing grooves 322 can fix the sealing ring 321, preventing it from loosening or shifting due to vibration or rotation during operation and maintaining the consistency of the sealing effect.

[0033] The outer ring of the sealing ring 321 is embedded in the sealing groove 322, and the inner ring of the sealing ring 321 passes through the annular gap and abuts against the turntable 200. The sealing ring 321 fixed in the multiple sets of sealing grooves 322 is more stable when abutting against the turntable 200, reducing the wear caused by rotation and extending the service life of the sealing ring 321.

[0034] In some embodiments, referring to Figure 3 , a friction sleeve 321a is provided on the inner ring of the sealing ring 321. The friction sleeve 321a abuts against the turntable 200. The friction sleeve 321a can be made of wear-resistant materials (such as PTFE, PEEK or other high-performance polymers). The wear-resistant materials have a low coefficient of friction and good wear resistance. The friction sleeve 321a can replace the sealing ring 321 to contact the turntable 200, thereby reducing the wear of the sealing ring 321 and extending the service life of the sealing ring 321. The low friction characteristic of the friction sleeve 321a enables it to maintain close contact with the turntable 200, effectively blocking foreign substances, water and dust from entering the annular gap.

[0035] In some embodiments, continue to refer to Figure 3 , the cross-section of the sealing ring 321 is relatively bent. The inner and outer rings of the sealing ring 321 are elastically abutted against the sealing groove 322 and the turntable 200 respectively. The bent cross-section of the sealing ring 321 gives it a certain elasticity. When the friction sleeve 321a wears, the sealing ring 321 can automatically compensate for the wear amount through its own elastic deformation and maintain close contact with the turntable 200. The automatic compensation function can reduce the decline of the sealing performance caused by the wear of the friction sleeve 321a, thereby extending the service life of the sealing system.

[0036] The inner and outer rings of the sealing ring 321 are abutted against the sealing groove 322 and the turntable 200 respectively through elastic action. Even after the friction sleeve 321a wears, the sealing ring 321 can still maintain a good sealing effect and prevent foreign substances, water and dust from entering the annular gap.

[0037] In some embodiments, continue to refer to Figure 3 , the sealing groove 322 is communicated with the annular gap. High-pressure air can act on the sealing ring 321 to provide additional pressure, so that the sealing ring 321 abuts against the sealing groove 322 and the turntable 200 more tightly, enhancing the sealing effect. The high-pressure air can act on the sealing ring 321 in real time. When the friction sleeve 321a or the sealing ring 321 wears, by increasing the air pressure, the wear amount is automatically compensated to maintain the consistency of the sealing effect. The sealing ring 321 can effectively block foreign substances, water and dust from entering the annular gap and reduce the leakage risk.

[0038] In some embodiments, referring to Figure 1 , the sealing assembly 300 further includes a gas transmission unit 330. The gas transmission unit 330 includes an annular tube body 331 embedded in the workbench 100. Each jet groove is communicated with the annular tube body 331. The annular tube body 331 can evenly distribute high-pressure gas to each jet groove to ensure the uniformity and consistency of gas distribution. The uniform gas distribution provides a stable air flow, making the sealing effect of the sealing assembly 300 more reliable and durable.

[0039] As a further implementation manner, a communication hole 311a is formed in the jet groove body 311. The communication hole 311a communicates with the annular pipe body 331. The gas located in the annular pipe body 331 can communicate with the jet groove body 311 through the communication hole 311a to supply gas to the jet groove body 311.

[0040] In some embodiments, please continue to refer to Figure 1 , the gas transmission unit 330 further includes a gas supply joint 332. The gas supply joint 332 can be connected to a blower through a pipeline. The gas supply joint 332 communicates with the annular pipe body 331. The gas supply joint 332 can continuously supply high-pressure gas into the annular pipe body 331 to form an air flow barrier at the upper end of the annular gap.

[0041] Working process: Before the turntable 200 works, start the external blower and input high-pressure gas into the annular pipe body 331 through the gas supply joint 332. The high-pressure gas can be input into the jet groove body 311 from the connection hole and jet the high-pressure gas into the annular gap. The high-pressure gas jets out from the upper end of the annular gap, and a gas barrier can be formed to prevent external water, cutting chips and dust from entering the annular gap.

[0042] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the present invention.

Claims

1. A sealing structure for a turntable, comprising a workbench and a turntable, wherein the turntable is inserted into the workbench to form an annular gap, characterized in that, It further includes a sealing assembly disposed in the annular gap. The sealing assembly includes a jetting unit and a sealing unit disposed in the workbench. The sealing unit includes a sealing ring, and the sealing ring is disposed in the annular gap to block the lower opening of the annular gap. A plurality of jetting grooves are provided on the top of the workbench opposite to the annular gap. The jetting grooves are arranged along the radial direction of the workbench, and the jetting grooves can jet air into the annular gap to prevent debris from entering through the upper opening of the annular gap and press against the sealing ring located at the lower opening of the annular gap.

2. The sealing structure of a turntable according to claim 1, wherein, The cross-section of the jetting groove is gradually expanded from the inside to the outside of the workbench, and one side of the jetting groove communicates with the annular gap.

3. The sealing structure of a turntable according to claim 1 or 2, characterized in that, The plurality of jetting grooves are equidistantly spaced along the central axis of the workbench, and the plurality of jetting grooves jet air outwards to form a barrier to prevent debris from intrusion.

4. A sealing structure of a turntable according to claim 1, characterized in that At least two groups of sealing grooves are provided on the inner side of the workbench. The outer ring of the sealing ring is embedded in the sealing groove, and the inner ring of the sealing ring abuts against the turntable through the annular gap.

5. The sealing structure of a turntable according to claim 4, characterized in that, A friction sleeve is provided on the inner ring of the sealing ring, and the friction sleeve abuts against the turntable.

6. The sealing structure of a turntable according to claim 5, wherein, The cross-section of the sealing ring is relatively curved, and the inner and outer rings of the sealing ring elastically abut against the sealing groove and the turntable respectively. The sealing ring can automatically compensate for the wear of the friction sleeve.

7. The sealing structure of a turntable according to claim 6, characterized in that, The sealing groove communicates with the annular gap, and high-pressure air can act on the sealing ring to drive the sealing ring to press tightly against the sealing groove and the turntable.

8. The sealing structure of a turntable according to claim 1, wherein The sealing assembly further includes an air delivery unit. The air delivery unit includes an annular tube body embedded in the workbench. Each jetting groove communicates with the annular tube body, and the annular tube body can provide high-pressure gas to the jetting grooves.

9. The sealing structure of a turntable according to claim 8, wherein, A communication hole is formed in the jetting groove, and the communication hole communicates with the annular tube body.

10. The sealing structure of a turntable according to claim 8, characterized in that, The air delivery unit further includes a gas supply joint, and the gas supply joint communicates with the annular tube body to supply high-pressure gas to the annular tube body.

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