Rotary table sealing structure, rotary table and machine tool

Abstract

The rotary table sealing structure comprises a machine body, a shaft core and a rotary disc, the shaft core is installed on the machine body through a bearing, the rotary disc is arranged at the end of the shaft core, and the rotary disc and the shaft core form a rotating body capable of rotating around the axis of the shaft core. A contact sealing structure is arranged on the outer side of the bearing between the rotating body and the machine body and comprises a first sealing ring arranged on the rotating body and a sealing ring arranged on the machine body, and the first sealing ring extends from the first end to the second end in the axial direction of the shaft core. The first end of the first sealing ring is connected to the rotating body, the second end of the first sealing ring forms a free end capable of generating centrifugal deformation, and the sealing ring is provided with an axial friction end face in contact fit with the second end. The first sealing ring can generate different centrifugal forces due to different rotating speeds of the rotary table during high-speed rotation, so that the pressure of the first sealing ring on the axial friction end surface is reduced along with the increase of the rotating speed.

Description

Technical Field

[0001] The utility model is used in the field of machine tools, and particularly relates to a turntable sealing structure, a turntable and a machine tool. Background Art

[0002] In recent years, high-end machine tools have developed well, and the requirements for machine tool processing capabilities are getting higher and higher. In particular, some five-axis or high-speed vertical turntables need to meet some turning and milling functions. Since turning processing requires a certain linear speed, which is generally above 700 rpm, this poses a great challenge to the seals of large-size disk turntables (500mm disk and above). The traditional non-contact sealing air seal has a large cross-section and cannot achieve a good sealing effect. The linear speed of the contact sealing exceeds the range that conventional seals can withstand, resulting in problems such as friction and heat of the seals at high speeds leading to failure. Utility Model Content

[0003] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art and to provide a turntable sealing structure, a turntable and a machine tool.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] In the first aspect, a turntable sealing structure includes a body, a shaft core and a turntable, wherein the shaft core is installed on the body through a bearing, and the turntable is arranged at the end of the shaft core. The turntable and the shaft core form a rotating body that can rotate around the axis of the shaft core. A contact sealing structure is provided between the rotating body and the body on the outside of the bearing, and the contact sealing structure includes a first sealing ring provided on the rotating body and a sealing ring provided on the body, the first sealing ring extends from the first end to the second end along the axial direction of the shaft core, the first end of the first sealing ring is connected to the rotating body, and the second end forms a free end that can produce centrifugal deformation, and the sealing ring is provided with an axial friction end face that contacts and cooperates with the second end.

[0006] In combination with the first aspect, in certain implementations of the first aspect, the second end of the first sealing ring has a V-shaped end surface extending along the circumferential direction.

[0007] In combination with the first aspect and the above-mentioned implementation manner, in some implementation manners of the first aspect, the sealing ring is provided with a cooling cavity on the inner side of the axial friction end surface, and the body is provided with a cooling medium flow channel connected to the cooling cavity.

[0008] In combination with the first aspect and the above-mentioned implementation manner, in some implementation manners of the first aspect, the sealing ring is provided at the end of the body, and a second sealing ring is provided between the sealing ring and the body.

[0009] In combination with the first aspect and the above-mentioned implementation manner, in some implementation manners of the first aspect, a labyrinth sealing structure is formed between the sealing ring and the turntable, and the labyrinth sealing structure is arranged on the outside of the first sealing ring.

[0010] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the sealing ring forms a water collection area on the outside of the first sealing ring, the sealing ring and / or the body is provided with a drainage channel, the drainage channel forms a drainage inlet in the water collection area, the body forms a drainage outlet, and the drainage inlet is higher than the drainage outlet.

[0011] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the drainage channel includes a plurality of radial holes and a plurality of axial holes, and the radial holes and the axial holes are sequentially connected to form the drainage channel.

[0012] In combination with the first aspect and the above implementations, in some implementations of the first aspect, the first sealing ring is a rubber ring.

[0013] In a second aspect, a turntable comprises the turntable sealing structure described in any implementation manner in the first aspect.

[0014] In a third aspect, a machine tool comprises the turntable described in any implementation of the second aspect.

[0015] One of the above technical solutions has at least one of the following advantages or beneficial effects: In the technical solution of the utility model, the first sealing ring and the sealing ring cooperate with each other to form a contact seal on the outer side of the bearing, wherein the first end of the first sealing ring is connected to the rotating body, and the first sealing ring and the rotating body can rotate together during operation, and the second end of the first sealing ring is a free end, which can produce centrifugal deformation during the rotation of the rotating body, thereby reducing the pressure on the axial friction end surface of the sealing ring and further reducing the friction between the sealing ring and the sealing ring. When the first sealing ring rotates at high speed, it can generate different centrifugal forces depending on the rotation speed of the turntable, so that the pressure of the first sealing ring on the axial friction end surface will also decrease with increasing rotation speed.

[0016] The technical solution of the utility model can change the pressure between the first sealing ring and the sealing ring by the rotation speed of the rotating body, thereby achieving the following: at high speed, the centrifugal force is increased, the pressure between the first sealing ring and the axial friction end surface is reduced, and the friction heat is reduced; at low speed, the centrifugal force is reduced, the pressure between the first sealing ring and the axial friction end surface is increased, and the sealing reliability is improved. In other words, the characteristics of low friction heat at high speed rotation and high sealing reliability at low speed rotation are achieved.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic structural diagram of an embodiment of the turntable sealing structure of the utility model;

[0020] Figure 2 yes Figure 1 A partial enlarged view of point Ⅰ in the middle;

[0021] Figure 3 yes Figure 1 A partial enlarged view of point II in the middle. DETAILED DESCRIPTION

[0022] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0023] In the present invention, if there is a description of directions (up, down, left, right, front and back), it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0024] In this utility model, "several" means one or more, "multiple" means more than two, "greater than," "less than," "exceeds," etc. are understood to exclude the number itself; "above," "below," "within," etc. are understood to include the number itself. In the description of this utility model, the use of "first" or "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0025] In this utility model, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection or electrical connection or mutual communication; and internal connection between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of these terms in this utility model based on the specific content of the technical solution.

[0026] See also Figure 1 、 Figure 2 、 Figure 3 The embodiment of the present invention provides a turntable sealing structure, including a body 100, a shaft core 200 and a turntable 300. The shaft core 200 is installed on the body 100 through a bearing 400. The turntable 300 is arranged at the end of the shaft core 200. The turntable 300 and the shaft core 200 form a rotating body that can rotate around the axis of the shaft core 200. The rotating body can rotate around the axis under the drive of the driving component to realize the turntable function. A contact sealing structure is provided between the rotating body and the body 100 on the outside of the bearing 400. The contact The sealing structure includes a first sealing ring 500 arranged on the rotating body and a sealing ring 600 arranged on the body 100. The first sealing ring 500 extends from a first end 501 to a second end 502 along the axial direction of the shaft core 200. The first sealing ring 500 has a certain length in the axial direction and a certain thickness in the radial direction. The first end 501 of the first sealing ring 500 is connected to the rotating body, and the second end 502 forms a free end that can produce centrifugal deformation. The sealing ring 600 is provided with an axial friction end face 601 that contacts and cooperates with the second end 502.

[0027] Combine Figure 1 、 Figure 2 In the technical solution of the present invention, the first sealing ring 500 and the sealing ring 600 cooperate with each other to form a contact seal on the outer side of the bearing 400 to prevent foreign matter from entering. The first end 501 of the first sealing ring 500 is connected to the rotating body, and the first sealing ring 500 and the rotating body can rotate together during operation. The second end 502 of the first sealing ring 500 is a free end, which can produce centrifugal deformation during the rotation of the rotating body, thereby reducing the pressure on the axial friction end surface 601 of the sealing ring 600 and further reducing the friction between the sealing ring 600 and the sealing ring 600. When the first sealing ring 500 rotates at high speed, it can generate different centrifugal forces due to the different rotation speeds of the turntable. Therefore, the pressure of the first sealing ring 500 on the axial friction end surface 601 will also decrease with the increase of the rotation speed.

[0028] The technical solution of the utility model can change the pressure between the first sealing ring 500 and the sealing ring 600 according to the rotation speed of the rotating body. As a result, at high speeds, the centrifugal force increases, the pressure between the first sealing ring 500 and the axial friction end surface 601 decreases, and frictional heat generation is reduced. At low speeds, the centrifugal force decreases, the pressure between the first sealing ring 500 and the axial friction end surface 601 increases, and the sealing reliability is improved. In other words, the advantages of low frictional heat generation at high speeds and high sealing reliability at low speeds are achieved.

[0029] In some embodiments, see Figure 2The second end 502 of the first sealing ring 500 has a V-shaped end surface 503 extending in the circumferential direction. The second end 502 of the first sealing ring 500 protrudes toward the axial friction end surface 601 to form a V-shaped end surface 503. The V-shaped end surface 503 is used to contact and cooperate with the axial friction end surface 601. In this embodiment, by setting the second end 502 of the first sealing ring 500 as the V-shaped end surface 503, when the speed is low, the tip edge of the V-shaped end surface 503 contacts and cooperates with the axial friction end surface 601. When the speed is high, the second end 502 of the first sealing ring 500 is centrifugally deformed and expanded outward. The tip edge of the V-shaped end surface 503 is radially outward, and the tip slope of the V-shaped end surface 503 contacts and cooperates with the axial friction end surface 601. In this embodiment, with the help of the V-shaped end surface 503 of the second end 502 of the first sealing ring 500, the pressure on the axial friction end surface 601 can be better reduced after the second end 502 of the first sealing ring 500 is centrifugally deformed, thereby more significantly reducing frictional heat generation.

[0030] The first sealing ring 500 can be made of elastic materials such as rubber rings to meet the technical requirements of centrifugal deformation and elastic contact sealing.

[0031] In some embodiments, see Figure 1 、 Figure 2 The sealing ring 600 is provided with a cooling cavity 602 on the inner side of the axial friction end surface 601, and the machine body 100 is provided with a cooling medium flow channel 603 communicating with the cooling cavity 602. A cooling medium such as water enters the cooling cavity 602 through the cooling medium flow channel 603 to forcibly cool the axial friction end surface 601. The forced cooling structure controls the temperature of the axial friction end surface 601, thereby protecting the life of the first sealing ring 500 and the axial friction end surface 601 and reducing the adverse effects of frictional heat on processing.

[0032] In some embodiments, see Figure 2 、 Figure 3 The sealing ring 600 can be made of a hard material with good thermal conductivity, such as metal. The sealing ring 600 is arranged at the end of the body 100. A second sealing ring 101 is provided between the sealing ring 600 and the body 100 to block external foreign matter.

[0033] In some embodiments, see Figure 2 、 Figure 3 A labyrinth seal structure 604 is formed between the sealing ring 600 and the rotating disk 300. This labyrinth seal structure 604 is located outside the first sealing ring 500. This structure largely blocks external foreign matter. This embodiment utilizes the labyrinth seal structure 604 and the contact seal structure to create a dual seal, effectively enhancing the sealing performance of the turntable.

[0034] In some embodiments, see Figure 3The sealing ring 600 forms a water collection area 605 outside the first sealing ring 500. The sealing ring 600 and / or the housing 100 are provided with a drainage channel 606. The drainage channel 606 forms a drainage inlet 607 in the water collection area 605, and the housing 100 forms a drainage outlet 608. The drainage inlet 607 is higher than the drainage outlet 608. Internally accumulated water is automatically guided by gravity through the drainage inlet 607 and discharged to the drainage outlet 608. This prevents water accumulation in the first sealing ring 500 and drains water that has entered due to front-end seal failure, further ensuring sealing reliability across the entire speed range, from high to low speeds.

[0035] Further, see Figure 3 The drainage channel 606 includes several radial holes and several axial holes, which are connected in sequence to form the drainage channel 606. In this embodiment, a bending structure is formed by setting the drainage channel 606 as several radial holes and axial holes to prevent foreign matter from entering during discharge.

[0036] An embodiment of the present utility model further provides a turntable, comprising the turntable sealing structure in any of the above embodiments.

[0037] An embodiment of the present utility model further provides a machine tool, comprising the turntable in any one of the above embodiments.

[0038] Throughout this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0039] Of course, the invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all within the scope defined by the claims of this application.

Claims

1. A turntable sealing structure, characterized in that: The invention comprises a machine body, a shaft core and a turntable, wherein the shaft core is mounted on the machine body through a bearing, and the turntable is arranged at the end of the shaft core. The turntable and the shaft core form a rotating body that can rotate around the axis of the shaft core. A contact sealing structure is provided between the rotating body and the machine body on the outer side of the bearing, and the contact sealing structure comprises a first sealing ring provided on the rotating body and a sealing ring provided on the machine body, the first sealing ring extends from a first end to a second end along the axial direction of the shaft core, the first end of the first sealing ring is connected to the rotating body, and the second end forms a free end that can produce centrifugal deformation, and the sealing ring is provided with an axial friction end face that contacts and cooperates with the second end.

2. The turntable sealing structure according to claim 1, characterized in that: The second end of the first sealing ring has a V-shaped end surface extending along the circumferential direction.

3. The turntable sealing structure according to claim 1, characterized in that: The sealing ring is provided with a cooling cavity on the inner side of the axial friction end surface, and the machine body is provided with a cooling medium flow channel communicating with the cooling cavity.

4. The turntable sealing structure according to claim 1, characterized in that: The sealing ring is arranged at the end of the machine body, and a second sealing ring is provided between the sealing ring and the machine body.

5. The turntable sealing structure according to claim 1, characterized in that: A labyrinth sealing structure is formed between the sealing ring and the rotary disk, and the labyrinth sealing structure is arranged on the outside of the first sealing ring.

6. The turntable sealing structure according to claim 5, characterized in that: The sealing ring forms a water collection area on the outside of the first sealing ring, and the sealing ring and / or the body are provided with a drainage channel, the drainage channel forms a drainage inlet in the water collection area, the body forms a drainage outlet, and the drainage inlet is higher than the drainage outlet.

7. The turntable sealing structure according to claim 6, characterized in that: The drainage channel includes a plurality of radial holes and a plurality of axial holes, and the radial holes and the axial holes are sequentially connected to form the drainage channel.

8. The turntable sealing structure according to claim 1, characterized in that: The first sealing ring is a rubber ring.

9. A turntable, characterized in that: The invention comprises the turntable sealing structure according to any one of claims 1 to 8.

10. A machine tool, characterized in that: Including the turntable according to claim 9.

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