CN218543173U

CN218543173U - Sealing structure of rotary table

Info

Publication number: CN218543173U
Application number: CN202223057840.0U
Authority: CN
Inventors: 赵秀忠; 刘灿; 刘旭锋; 张光泽
Original assignee: Beijing Jingdiao Group Co Ltd
Current assignee: Beijing Jingdiao Group Co Ltd
Priority date: 2022-11-18
Filing date: 2022-11-18
Publication date: 2023-02-28
Anticipated expiration: 2032-11-18

Abstract

The utility model relates to a seal structure of revolving stage aims at providing a simple structure, sealed effectual, safe and reliable's high-speed seal structure for revolving stage, effectively guarantees the reliability of high-speed revolving stage. The automatic grinding machine comprises a base, a workbench, a sealing cover and a self-grinding ring, wherein the workbench rotates relative to the base; the sealing cover is arranged between the workbench and the base and is fixed at the upper part of the base; the self-grinding ring and the sealing cover are coaxially arranged, the elastic body is arranged at the bottom of the self-grinding ring, the elastic body acts on the sealing cover, and the self-grinding ring can be in friction contact with the workbench under the elastic force action of the elastic body.

Description

Sealing structure of rotary table

Technical Field

The utility model belongs to the digit control machine tool field, in particular to seal structure of revolving stage.

Background

The numerical control machine tool is provided with the high-speed rotary table, so that the numerical control machine tool has very important significance on complex curved surface machining, multi-angle machining and diversified machining, the working environment of the high-speed rotary table is very complex in the machining process, a workpiece continuously sprays cutting fluid, fine cutting chips and dust are mixed in the cutting fluid, the cutting fluid can also generate oil mist, and the sealing mode between the rotary part of the rotary table and the rotary table base is very important because the workpiece is directly installed and fixed on the rotary part of the high-speed rotary table.

At present, most of the sealing modes of the rotary table adopt sealing element sealing and labyrinth sealing, the sealing element sealing is mainly used for low-speed rotary tables, the sealing elements such as a framework oil seal, a V-shaped ring and a dust ring are adopted to be in direct contact with a rotary part of the rotary table, and the sealing effect is achieved through elastic deformation of the sealing elements. According to the sealing mode, due to the fact that friction force exists between the sealing element and the rotary table, along with the increase of the rotating speed of the rotary table, the friction force can generate a large amount of heat to further enable the sealing element to lose efficacy, friction heating can be reduced by reducing the deformation of the sealing element, but the sealing gap is too large to achieve the sealing effect, and therefore the sealing mode of the sealing element is not suitable for a high-speed rotary table. Labyrinth seals sets up the labyrinth clearance between revolving stage rotation part and revolving stage base, leads to positive pressure gas simultaneously in the labyrinth clearance, forms airtight, but because labyrinth structure gas circuit distribution is complicated, the revolving stage overturns at different angles in the course of working simultaneously, leads to the labyrinth clearance to give vent to anger inhomogeneously easily, causes some positions weak, and then increases the risk of sealed inefficacy, leads to the inside intaking of revolving stage easily.

Disclosure of Invention

An object of the utility model is to overcome prior art not enough, provide a simple structure, sealed effectual, safe and reliable's high-speed seal structure for revolving stage, effectively guarantee the reliability of high-speed revolving stage.

In order to solve the technical problem, the utility model discloses a realize through following technical scheme: a sealing structure of a rotary table comprises a base, a workbench, a sealing cover and a self-grinding ring, wherein the workbench rotates relative to the base; the sealing cover is arranged between the workbench and the base and is fixed at the upper part of the base; the self-grinding ring is coaxially arranged with the sealing cover, an elastic body is arranged at the bottom of the self-grinding ring, the elastic body acts on the sealing cover, and the self-grinding ring can be in frictional contact with the workbench under the elastic action of the elastic body.

The sealing structure of the rotary table is characterized in that a self-grinding ring accommodating groove is formed in the center of the sealing cover, and the self-grinding ring is arranged in the self-grinding ring accommodating groove and can axially move along the groove wall of the self-grinding ring accommodating groove.

Above-mentioned seal structure of revolving stage, the elastomer is the spring, the bottom of self-grinding ring evenly is provided with a plurality of spring guide ways, is provided with the spring in the spring guide way respectively, and the one end of spring acts on the bottom of self-grinding ring storage tank, and the other end acts on the bottom of spring guide way.

According to the sealing structure of the rotary table, the self-grinding ring is of an annular structure and is made of the wear-resistant self-lubricating polytetrafluoroethylene material.

Compared with the prior art, the beneficial effects of the utility model reside in that: the mechanical self-grinding seal is formed between the self-grinding ring and the workbench, so that the seal failure caused by uneven air pressure distribution in the overturning process of the turntable by the labyrinth seal can be effectively avoided; and the friction force between the self-grinding ring and the workbench is controlled by the spring, so that the sealing element failure caused by serious heating due to excessive friction force in sealing of the sealing element and the possibility of excessive friction force sealing failure can be avoided. Meanwhile, positive pressure gas inside the rotary table is combined, and the positive pressure gas seals fine dust particles and oil mist outside the rotary table through a gap between the self-grinding ring and the workbench; the mechanical self-grinding seal and the positive pressure gas in the rotary table form double-layer seal, so that the sealing performance of the high-speed rotary table is greatly improved, and the reliability of the high-speed rotary table is further improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only used for convenience of description and simplification of the description of the embodiments of the present invention, and do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present invention.

As shown in fig. 1, the sealing structure of the turntable of the present invention includes a base 1, a sealing cover 2, a self-grinding ring 3 and a worktable 4. The table 4 is rotatable relative to the base 1. Sealed lid 2 sets up between workstation 4 and base 1 to on being fixed in base 1 through screw 5, for avoiding the inside positive pressure gas of revolving stage to reveal from between base 1 and sealed lid 2, adopt sealed glue to seal or adopt the sealing washer sealed between base 1 and the sealed lid 2.

The center of the sealing cover 2 is provided with a self-grinding ring accommodating groove 21, and the self-grinding ring 3 is arranged in the self-grinding ring accommodating groove 21 and can axially move in the sealing cover 2 along the groove wall of the self-grinding ring accommodating groove 21. Spring guide grooves 31 are uniformly formed in the bottom of the self-grinding ring 3, a spring 6 is arranged in each spring guide groove 31, one end of each spring 6 acts on the bottom of the self-grinding ring accommodating groove 21, and the other end of each spring 6 acts on the bottom of the spring guide groove 31. Self-grinding ring 3 can be in frictional contact with workstation 4 under the spring force effect of spring 6 to realize that machinery autogenously grinds sealedly, according to self-grinding ring 3 and workstation 4 area of contact, through the rigidity and the quantity of adjustment spring 6, can guarantee the frictional force between self-grinding ring 3 and the workstation 4, and then the friction of control revolving stage in the work generates heat. Self-grinding ring 3 adopts novel wear-resisting self-lubricating polytetrafluoroethylene material, along with the wearing and tearing of self-grinding ring 3 in the revolving stage work, the frictional force between self-grinding ring 3 and workstation 4 reduces and then reaches the equilibrium, simultaneously the clearance between self-grinding ring 3 and the workstation 4 can be more even tiny, the inside positive pressure gas of revolving stage seals fine dust particle and oil mist outside the revolving stage through the clearance of self-grinding ring 3 with workstation 4, can form the mechanical self-grinding and seal and the double-deck sealed that positive pressure gas combined together.

In addition, the spring 6 in this embodiment may be replaced by another elastic element.

Although the present invention has been described in detail, the present invention is not limited thereto, and those skilled in the art can make various modifications according to the principle of the present invention. Therefore, modifications made in accordance with the principles of the present invention should be understood to fall within the scope of the present invention.

Claims

1. A sealing structure of a rotary table is characterized by comprising a base, a workbench, a sealing cover and a self-grinding ring, wherein the workbench rotates relative to the base; the sealing cover is arranged between the workbench and the base and is fixed on the upper part of the base; the self-grinding ring and the sealing cover are coaxially arranged, the elastic body is arranged at the bottom of the self-grinding ring, the elastic body acts on the sealing cover, and the self-grinding ring can be in friction contact with the workbench under the elastic force action of the elastic body.

2. A sealing structure of a turntable as claimed in claim 1, wherein said seal cover is provided at a center thereof with a self-grinding ring accommodating groove, and said self-grinding ring is disposed in the self-grinding ring accommodating groove so as to be axially movable along a groove wall thereof.

3. The sealing structure of a turntable according to claim 2, wherein the elastic body is a spring, the bottom of the self-grinding ring is uniformly provided with a plurality of spring guide grooves, the spring guide grooves are respectively provided with springs, one end of each spring acts on the bottom of the self-grinding ring accommodating groove, and the other end of each spring acts on the bottom of the spring guide groove.

4. A sealing structure of a rotary table according to claim 1, 2 or 3, wherein said self-grinding ring is a ring structure made of wear-resistant self-lubricating teflon material.