Sealing protection structure of rotating table

Abstract

The utility model relates to the technical field of machine tools, and discloses a sealing protection structure of a rotating table. The sealing protection structure specifically comprises a protection ring fixed to the shell and close to the tail end of the rotary disc, and the end face, facing the rotary disc, of the protection ring is provided with a gas uniformizing groove and a first annular protrusion located on the outer side of the gas uniformizing groove. The first annular groove is formed in the rotating disc, the first annular groove and the first annular protrusion are in clearance fit to form a first protection gas path, and the two ends of the first protection gas path are connected with the gas uniformizing groove and external air correspondingly; wherein the side face of the first annular protrusion is provided with at least one third annular groove, the third annular groove is provided with an inclined flow guide groove wall, the flow guide groove wall is used for guiding airflow to form vortexes, and an air curtain with a plurality of airflow vortexes is formed in the first protection air path to improve the sealing protection capacity.

Description

Technical Field

[0001] The utility model relates to the technical field of machine tools, in particular to a sealing protection structure of a rotary worktable. Background Art

[0002] The rotary table is a precision rotating device that achieves high-precision rotational motion.

[0003] Most of the sealing methods for CNC rotary tables currently on the market are sealing rings and labyrinth air curtains. Sealing rings are generally used for low-speed turntables. Generally, TC oil seals, VA-type sealing rings, O-rings and other seals are used to directly contact the turntable, and the elastic deformation of the sealing rings is used to achieve the sealing effect. This type of sealing will cause friction between the contact surface of the sealing ring and the turntable. The frictional temperature will cause the sealing ring to be damaged and fail. Therefore, a single sealing ring method is not suitable for high-speed turntables. The traditional labyrinth air curtain sealing structure is relatively simple and has limited sealing performance. Especially for CNC machine tools in complex working environments, a single labyrinth sealing structure may cause sealing failure, affecting the working reliability of the rotary table. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art and proposes a sealing protection structure for a rotary worktable, which improves the sealing protection effect by forming an air curtain with a plurality of air flow vortices.

[0005] The utility model proposes a sealing and protective structure of a rotary worktable, which comprises an outer shell 1, a core shaft 2 inserted in the outer shell 1, a turntable 3 fixedly connected to one end of the core shaft 2, and a bearing 4 arranged between the core shaft 2 and the outer shell 1; the sealing and protective structure specifically comprises: a protective ring 7 fixed to the end of the outer shell 1 near the turntable 3, the end surface of the protective ring 7 facing the turntable 3 is provided with an air equalizing groove 73 and a first annular protrusion 71 located on the outside of the air equalizing groove 73; a first annular groove 31 is provided on the turntable 3, the first annular groove 31 and the first annular protrusion 71 are clearance-matched to form a first protective air path, and the two ends of the first protective air path are respectively connected to the air equalizing groove 73 and the outside air; wherein, at least one third annular groove 711 is provided on the side of the first annular protrusion 71, and the third annular groove 711 has an inclined guide groove wall 712.

[0006] In some preferred embodiments, there are multiple third annular grooves 711 , and the multiple third annular grooves 711 are arranged at intervals on the outer side wall of the first annular protrusion 71 .

[0007] In some preferred embodiments, the guide groove wall 712 extends obliquely from the groove bottom of the third annular groove 711 toward the groove opening, so that the groove opening size of the third annular groove 711 is larger than the size of the groove bottom of the third annular groove 711 .

[0008] In some preferred embodiments, the angle between the guide channel wall 712 and the horizontal plane is between 10° and 40°.

[0009] In some preferred embodiments, the radial dimension of the gas equalizing groove 73 is greater than the radial dimension of the first annular protrusion 71 .

[0010] In some preferred embodiments, a limiting ring groove 76 is provided on the outer side wall of the protective ring 7 , and a sealing ring 77 is provided between the limiting ring groove 76 and the inner side wall of the housing 1 .

[0011] In some preferred embodiments, a first step portion 11 is provided inside the end of the housing 1 close to the turntable 3 , and the protective ring 7 is fixed on the first step portion 11 .

[0012] In some preferred embodiments, the protective ring 7 further includes a plurality of air channels 74 , one end of the air channel 74 is connected to the air equalization groove 73 , and the other end of the air channel 74 is connected to the air source interface 10 provided on the housing 1 .

[0013] In some preferred embodiments, the protective ring 7 also includes a second annular protrusion 72 provided on the inner side of the gas equalizing groove 73, and a second annular groove 32 located on the inner side of the first annular groove 31 is also provided on the side of the turntable 3. The second annular groove 32 and the second annular protrusion 72 are clearance-matched to form a second protective gas path connected to the gas equalizing groove 73.

[0014] In some preferred embodiments, a supporting step 75 is provided on the inner side wall of the protective ring 7 , and a sealing member 8 is provided between the supporting step 75 and the turntable 3 . The sealing member 8 is located at the end of the second protective air path.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The utility model installs a protective ring between the end of the shell and the turntable, and forms a first protective air path through the clearance fit of the first annular protrusion of the protective ring and the first annular groove of the turntable, and arranges a plurality of third annular grooves on the side of the first annular protrusion of the protective ring, so that the airflow is guided by the inclined guide groove wall when passing through each third annular groove and then accelerated to form a vortex, thereby forming an air curtain with a plurality of airflow vortices in the first protective air path, so that the air curtain can effectively isolate processing liquid, processing dust and other debris from entering the interior of the shell, thereby improving the sealing protection performance of the rotary worktable and improving the reliability of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the rotary table.

[0018] Figure 2 It is a schematic diagram of the internal structure of the rotary table.

[0019] Figure 3 yes Figure 2 A partial enlarged view of .

[0020] Figure 4 It is a schematic diagram of the decomposed structure of the rotary table.

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the protective ring.

[0022] Figure 6 It is a schematic diagram of the front view structure of the protective ring.

[0023] Figure 7 yes Figure 6 A partial enlarged view of . DETAILED DESCRIPTION

[0024] To further illustrate the technical means and effects employed by this application to achieve its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of this application is provided in conjunction with the accompanying drawings and preferred embodiments. In the following description, different references to "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0025] Combine Figure 1 and Figure 2 As shown, the rotary workbench includes a shell 1, a core shaft 2 inserted in the shell 1, a turntable 3 arranged on the outer side of the shell 1 and fixedly connected to one end of the core shaft 2, and a bearing 4 arranged between the core shaft 2 and the shell 1. The core shaft 2 rotates relative to the shell 1 using the bearing 4, thereby driving the turntable 3 to rotate with the workpiece loaded on the turntable 3.

[0026] The core shaft 2 can be driven by an external power source or directly by a direct-drive motor disposed within the housing 1. For example, the direct-drive motor disposed within the housing 1 is located at the end of the core shaft 2 opposite the turntable 3. The direct-drive motor includes a motor rotor 5 and a motor stator 6. The motor rotor 5, motor stator 6, and core shaft 2 are coaxially disposed. The motor stator 6 is fixed to the inner wall of the housing 1, while the motor rotor 5 is fixed to the core shaft 2. The direct-drive motor drives the core shaft 2 to rotate the turntable 3 as needed.

[0027] The rotary table is used to rotate the workpiece to the desired processing position. The workpiece is fixed on the turntable 3. In order to prevent the machining fluid, debris, etc. from entering the interior of the housing 1 during milling, cutting, and other processing of the workpiece, thereby affecting the accuracy of the rotary table, the present invention improves the sealing protection structure of the rotary table to ensure reliable sealing protection between the turntable 3 and the end of the housing 1.

[0028] Further integration Figure 2-Figure 7As shown, the sealing protection structure specifically includes a protection ring 7 and a sealing member 8. The protection ring 7 is fixed to the end of the housing 1 close to the turntable 3, and the sealing member 8 is arranged between the radial inner side of the protection ring 7 and the turntable 3.

[0029] An air equalizing groove 73 and a first annular protrusion 71 located outside the air equalizing groove 73 are provided on the end face of the protective ring 7 facing the turntable 3. A plurality of third annular grooves 711 are provided on the radial outer side face of the first annular protrusion 71. The third annular groove 711 has an inclined guide groove wall 712. A first annular groove 31 is provided on the turntable 3. The first annular groove 31 and the first annular protrusion 71 are clearance-matched to form a first protective air path. The two ends of the first protective air path are respectively connected to the air equalizing groove 73 and the outside air.

[0030] The protective ring 7 includes a plurality of air channels 74, one end of which is connected to the gas equalization groove 73, and the other end of which is connected to the gas source interface 10 provided on the housing 1. The gas source interface 10 is connected to an external gas source, so that the gas generated by the gas source is sent into the gas equalization groove 73 through the air channels 74. The gas flows from the gas equalization groove 73 into the first protective gas path and forms an air curtain during the process of flowing out to the outside air.

[0031] There are multiple third annular grooves 711 , and the multiple third annular grooves 711 are arranged at intervals on the outer side wall of the first annular protrusion 71 .

[0032] The utility model provides a plurality of third annular grooves 711, and allows the air flow to be guided by the inclined guide groove wall 712 when passing through each third annular groove 711 and then accelerated to form a vortex, thereby forming an air curtain with a plurality of air flow vortices in the first protective air path, thereby improving the protective ability of the air curtain to effectively isolate processing liquid, processing dust and other debris from entering the interior of the shell 1.

[0033] Among them, the guide groove wall 712 extends obliquely from the bottom of the third annular groove 711 toward the groove opening, so that the groove opening size of the third annular groove 711 is larger than the size of the groove bottom of the third annular groove 711. When the airflow flows through the groove opening of each third annular groove 711, part of the airflow enters the third annular groove 711, and then flows out from the groove bottom of the third annular groove 711 through the guide groove wall 712 to the groove opening, causing the airflow to accelerate and generate an airflow vortex.

[0034] In addition, the angle between the guide groove wall 712 and the horizontal plane is preferably in the range of 10° to 40°, which is conducive to allowing the airflow to flow through the notch of the guide groove wall 712 and more easily generate airflow vortex in each third annular groove 711 quickly.

[0035] The radial dimension of the gas equalizing groove 73 is set to be larger than the radial dimension of the first annular protrusion 71 to ensure that the gas equalizing groove 73 has a larger volume, so that after the gas is sent into the gas equalizing groove 73 through several air channels 74, the gas pressure at each position in the gas equalizing groove 73 is balanced.

[0036] The radial dimension of the gas equalizing groove 73 refers to the radial distance from the inner side surface of the first annular protrusion 71 to the opposite first annular groove 31; the radial dimension of the first annular protrusion 71 refers to the radial distance between the outer wall and the inner wall of the first annular protrusion 71, that is, the radial thickness of the first annular protrusion 71.

[0037] The protective ring 7 also includes a second annular protrusion 72 located inside the air-equalizing groove 73. A second annular groove 32 is also provided on the side of the turntable 3, located inside the first annular groove 31. The second annular groove 32 and the second annular protrusion 72 are loosely fitted together to form a second protective air path connected to the air-equalizing groove 73. When the air-equalizing groove 73 enters the second protective air path, an air curtain is formed, thereby forming a second airtight protection for the first protective air path.

[0038] Furthermore, the guard ring 7 further includes a support step 75 provided inside the second annular protrusion 72, and a seal 8 is provided between the support step 75 and the rotary disk 3. The seal 8 is preferably an oil seal.

[0039] Therefore, the seal 8 is located at the end of the second protective air path, that is, the second protective air path is located between the seal 8 and the gas equalization groove 73. The seal 8 is used to seal the end of the second protective air path, further improving the sealing and protection performance of the second protective air path.

[0040] A first step portion 11 is provided inside the end of the housing 1 near the turntable 3, and the protective ring 7 is annular and fixed on the first step portion 11. Such a structure makes it easier to assemble the protective ring 7.

[0041] Furthermore, a limiting ring groove 76 is provided on the outer wall of the protection ring 7, and a sealing ring 77 is provided between the limiting ring groove 76 and the inner wall of the housing 1. The sealing ring 77 is used to seal the outer wall of the protection ring 7 and the inner wall of the housing 1.

[0042] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A sealing protection structure for a rotary table, comprising a housing (1), a core shaft (2) inserted into the housing (1), a turntable (3) fixedly connected to one end of the core shaft (2), and a bearing (4) arranged between the core shaft (2) and the housing (1), characterized in that: The sealing protection structure specifically includes: A protective ring (7) is fixed to the housing (1) near the end of the turntable (3), and an end surface of the protective ring (7) facing the turntable (3) is provided with an air-equalizing groove (73) and a first annular protrusion (71) located outside the air-equalizing groove (73); A first annular groove (31) is provided on the turntable (3), and the first annular groove (31) and the first annular protrusion (71) are clearance-matched to form a first protective air path, and both ends of the first protective air path are respectively connected to the air equalization groove (73) and the outside air; Wherein, at least one third annular groove (711) is provided on the side surface of the first annular protrusion (71), and the third annular groove (711) has an inclined guide groove wall (712).

2. The sealing protection structure according to claim 1, characterized in that: There are multiple third annular grooves (711), and the multiple third annular grooves (711) are arranged at intervals on the outer side wall of the first annular protrusion (71).

3. The sealing protection structure according to claim 1, characterized in that: The guide groove wall (712) extends obliquely from the groove bottom of the third annular groove (711) toward the groove opening, so that the size of the groove opening of the third annular groove (711) is larger than the size of the groove bottom of the third annular groove (711).

4. The sealing protection structure according to claim 1, characterized in that: The angle between the guide groove wall (712) and the horizontal plane is between 10° and 40°.

5. The sealing protection structure according to claim 1, characterized in that: The radial dimension of the gas equalizing groove (73) is greater than the radial dimension of the first annular protrusion (71).

6. The sealing protection structure according to claim 1, characterized in that: A limiting ring groove (76) is provided on the outer side wall of the protective ring (7), and a sealing ring (77) is provided between the limiting ring groove (76) and the inner side wall of the housing (1).

7. The sealing protection structure according to claim 1, characterized in that: A first step portion (11) is provided inside the end of the housing (1) close to the turntable (3), and the protective ring (7) is fixed on the first step portion (11).

8. The sealing protection structure according to claim 1, characterized in that: The protective ring (7) further includes a plurality of air channels (74), one end of the air channel (74) is connected to the air equalization groove (73), and the other end of the air channel (74) is connected to the air source interface (10) provided on the housing (1).

9. The sealing protection structure according to any one of claims 1 to 8, characterized in that: The protective ring (7) further includes a second annular protrusion (72) provided on the inner side of the gas equalizing groove (73). A second annular groove (32) located on the inner side of the first annular groove (31) is also provided on the side of the turntable (3). The second annular groove (32) and the second annular protrusion (72) are clearance-matched to form a second protective gas path connected to the gas equalizing groove (73).

10. The sealing protection structure according to claim 9, characterized in that: The inner side wall of the protective ring (7) is provided with a support step (75), and a sealing member (8) is provided between the support step (75) and the turntable (3). The sealing member (8) is located at the end of the second protective air path.

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