Spindle seal structure and machine tool

Abstract

The application discloses a main shaft sealing structure and a machine tool, and belongs to the technical field of machine tool sealing structures.The main shaft sealing structure comprises a main shaft box, an annular sealing seat, an annular oil baffle and a first annular sealing gasket, the main shaft box is provided with a main shaft, the annular sealing seat is arranged on the main shaft box, the annular sealing seat is sleeved with the main shaft, a first annular sealing groove is arranged on the inner side wall of the annular sealing seat in the circumferential direction, the annular oil baffle is arranged on one end of the annular sealing seat away from the main shaft box, the inner side of the annular oil baffle is connected with the main shaft, the outer side of the annular oil baffle is provided with an annular sealing plate, the annular sealing plate is sleeved with the annular sealing seat, the outer side wall of the annular sealing seat is provided with a second annular sealing groove, the second annular sealing groove is provided with an air inlet hole, the first annular sealing gasket is arranged on the end face of the main shaft box close to the annular oil baffle, and a first gap is reserved between the first annular sealing gasket and one end of the annular sealing plate away from the annular oil baffle.The main shaft sealing structure and the machine tool have better sealing effect and can effectively prevent oil and fine particles from the outside from entering.

Description

TECHNICAL FIELD

[0001] The present application relates to a machine tool structure, in particular to a spindle sealing structure and a machine tool. BACKGROUND

[0002] In use, a grinding machine has a large amount of cooling oil and grinding dust near the end of the spindle close to the machining area. In order to prevent the oil and dust from the outside from entering the bearing area through the gap between the spindle and the spindle box and affecting the work of the bearing, a sealing structure is generally provided. In the prior art, the sealing structure includes an annular sealing seat installed on the spindle box, the annular sealing seat surrounds the spindle, the inner side of the annular sealing seat is provided with an annular sealing groove in the circumferential direction, the annular sealing groove and the outer side wall of the spindle form an annular sealing cavity, and air or oil is filled into the annular sealing cavity to form an air seal or an oil seal.

[0003] The existing sealing structure has the following disadvantages: due to manufacturing and installation errors, the gap between the edge of the annular sealing groove and the outer side wall of the spindle is large, in addition, after being used for a long time, the gap between the edge of the annular sealing groove and the outer side wall of the spindle may also be large due to wear and other reasons, thereby resulting in poor sealing effect. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a spindle sealing structure, which has better sealing effect and can effectively prevent the oil and dust from the outside from entering.

[0005] The present application also provides a machine tool having the above-mentioned spindle sealing structure.

[0006] According to the spindle sealing structure of the first aspect of the present application, the spindle sealing structure comprises a spindle box, an annular sealing seat, an annular oil baffle and a first annular sealing pad, the spindle box is provided with a spindle, the annular sealing seat is arranged on the spindle box and surrounds the spindle, the inner side wall of the annular sealing seat is provided with a first annular sealing groove in the circumferential direction, the annular oil baffle is arranged at one end of the annular sealing seat away from the spindle box, the inner side of the annular oil baffle is connected to the spindle, the outer side of the annular oil baffle is provided with an annular sealing plate in the circumferential direction, the annular sealing plate surrounds the annular sealing seat, the outer side wall of the annular sealing seat is provided with a second annular sealing groove in the circumferential direction, the second annular sealing groove is provided with an air inlet hole, the first annular sealing pad is arranged on the end face of the spindle box close to the annular oil baffle and extends along the circumferential direction of the annular sealing plate, and a first gap is reserved between the first annular sealing pad and one end of the annular sealing plate away from the annular oil baffle.

[0007] According to the spindle sealing structure of the present application, at least the following advantages are achieved:

[0008] Firstly, the first annular sealing groove and the outer side wall of the main shaft can form a first annular sealing cavity, oil or air is injected into the first annular sealing cavity, and oil sealing or air sealing is formed in the first annular sealing cavity. Secondly, the main shaft is provided with an annular oil baffle, the annular oil baffle is provided with an annular sealing plate, the annular oil baffle and the annular sealing plate function as a protective cover, and the oil and fine particles in the outside world can be prevented from entering the gap between the annular sealing seat and the main shaft. Then, the second annular sealing groove and the inner side wall of the annular sealing plate can form a second annular sealing cavity, air is injected into the second annular sealing cavity through the air inlet hole, and air sealing is formed in the second annular sealing cavity, so that the oil and fine particles can be further prevented from entering. In addition, a first annular sealing gasket is arranged between the end face of the main shaft box close to the annular oil baffle and the end of the annular sealing plate away from the annular oil baffle, the first annular sealing gasket can function as a sealing cover, and the oil and fine particles can be further prevented from entering. Finally, when air is continuously injected into the second annular sealing cavity, the air is discharged from the second annular sealing cavity under pressure, a first gap is reserved between the first annular sealing gasket and the end of the annular sealing plate away from the annular oil baffle, the discharged air is sprayed out from the first gap, and the sprayed air forms an air flow, which can further prevent the oil and fine particles from entering. In summary, the multiple sealing structures are arranged, the sealing effect is better, and the oil and fine particles in the outside world can be effectively prevented from entering the bearing area and affecting the bearing.

[0009] According to some embodiments of the present application, the end face of the annular sealing seat close to the annular oil baffle is provided with a second annular sealing gasket in the circumferential direction, and the second annular sealing gasket is attached to the annular oil baffle; or a second gap is reserved between the second annular sealing gasket and the annular oil baffle, and the size of the second gap is smaller than the size of the first gap.

[0010] According to some embodiments of the present application, the width of the first annular sealing gasket in the radial direction is smaller than the width of the second annular sealing gasket in the radial direction.

[0011] According to some embodiments of the present application, the end face of the annular sealing seat close to the annular oil baffle is provided with an annular oil collecting groove in the circumferential direction, the annular oil collecting groove is located on the inner side of the second annular sealing gasket, and the annular oil collecting groove is provided with an oil discharge hole.

[0012] According to some embodiments of the present application, the end face of the annular sealing seat close to the annular oil baffle is provided with an annular sealing plug in the circumferential direction, the annular sealing plug is located on the inner side of the annular oil collecting groove, the annular oil baffle is correspondingly provided with an annular sealing slot, and the annular sealing plug is inserted into the annular sealing slot.

[0013] According to some embodiments of the present application, a labyrinth sealing ring is arranged between the annular sealing slot and the annular sealing plug.

[0014] According to some embodiments of the present application, the inner side of the first annular sealing gasket extends to the outer side of the end of the annular sealing seat away from the annular oil baffle, and the outer side of the main shaft end face is provided with an annular sink in the circumferential direction, and the inner side of the annular oil baffle extends into the annular sink.

[0015] According to some embodiments of the present application, the outer side of the end of the annular sealing plate away from the annular oil baffle is provided with an annular extension plate in the circumferential direction, and the annular extension plate is located on the outer side of the main shaft box.

[0016] According to some embodiments of the present application, the end face of the annular sealing seat away from the annular oil baffle is provided with an annular air supply groove in the circumferential direction, the annular air supply groove and the end face of the main shaft box close to the annular oil baffle form an annular air supply cavity, the annular air supply cavity is connected with air supply holes, the air supply holes are provided in plurality and extend along the circumferential direction of the second annular sealing groove, and the plurality of air supply holes are all communicated with the annular air supply cavity.

[0017] The machine tool according to the second aspect of the embodiments of the present application comprises the main shaft sealing structure according to the above-mentioned embodiments of the present application.

[0018] The machine tool according to the embodiments of the present application has at least the following beneficial effects:

[0019] By adopting the main shaft sealing structure according to the first aspect of the embodiments of the present application, firstly, the first annular sealing groove and the outer side wall of the main shaft can form a first annular sealing cavity, oil or air can be injected into the first annular sealing cavity, and an oil seal or an air seal can be formed in the first annular sealing cavity, secondly, the main shaft is provided with an annular oil baffle, the annular oil baffle is provided with an annular sealing plate, the annular oil baffle and the annular sealing plate act as a protective cover, which can reduce the entry of oil and fine particles from the gap between the annular sealing seat and the main shaft, then, the second annular sealing groove and the inner side wall of the annular sealing plate can form a second annular sealing cavity, air can be injected into the second annular sealing cavity through the air inlet hole, and an air seal can be formed in the second annular sealing cavity, which can further reduce the entry of oil and fine particles, in addition, the first annular sealing gasket is arranged between the end face of the main shaft box close to the annular oil baffle and the end of the annular sealing plate away from the annular oil baffle, the first annular sealing gasket can act as a sealing function, which can further reduce the entry of oil and fine particles, and finally, when air is continuously injected into the second annular sealing cavity, the air will be discharged from the second annular sealing cavity due to pressure, a first gap is reserved between the first annular sealing gasket and the end of the annular sealing plate away from the annular oil baffle, the discharged air can be sprayed out from the first gap, and the air flow formed by the sprayed air can further block the entry of oil and fine particles, in summary, by arranging multiple sealing structures, the sealing effect is better, which can effectively prevent the entry of oil and fine particles from the outside into the bearing area and affect the bearing.

[0020] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and the attendant drawings or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0021] The application will be further described below by reference to the drawings and examples, wherein:

[0022] Figure 1 is a schematic view of the main shaft vertically arranged in the application;

[0023] Figure 2 is a schematic view of the main shaft horizontally arranged in the application;

[0024] Figure 3 is Figure 1 is an enlarged view of A in the figure;

[0025] Figure 4 is Figure 1 is an enlarged view of B in the figure.

[0026] REFERENCE NUMERALS:

[0027] Main shaft box 100; main shaft 101; air supply hole 102; bearing 103;

[0028] Annular sealing seat 200; first annular sealing groove 201; second annular sealing groove 202; air inlet hole 203; annular oil collecting groove 204; oil discharge hole 205; annular sealing plug 206; annular air supply groove 207;

[0029] Annular oil retaining disc 300; annular sealing plate 301; annular sealing plug groove 302; annular extension plate 303;

[0030] First annular sealing gasket 400; first gap 401;

[0031] Second annular sealing gasket 500; second gap 501;

[0032] Labyrinth sealing ring 600. DETAILED DESCRIPTION

[0033] Embodiments of the application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals are used throughout the drawings to refer to the same or like elements or elements having the same or similar functionality. The embodiments described below are exemplary and are not intended to be limiting of the scope of the application. It will be apparent to those skilled in the art that numerous modifications, both as to the equipment and methods, can be effected. Thus, the application is not to be limited to the precise details shown and described.

[0034] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0035] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0036] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0037] The following is for reference. Figures 1 to 4 A spindle sealing structure and a machine tool according to embodiments of the present invention are described.

[0038] According to a first aspect of the present invention, a spindle sealing structure includes a spindle housing 100, an annular sealing seat 200, an annular oil baffle 300, and a first annular sealing gasket 400.

[0039] like Figures 1 to 4 As shown, a spindle housing 100 is equipped with a spindle 101, an annular sealing seat 200 is disposed in the spindle housing 100, and the annular sealing seat 200 is fitted onto the spindle 101. The inner wall of the annular sealing seat 200 has a first annular sealing groove 201 along its circumference. An annular oil baffle 300 is disposed at the end of the annular sealing seat 200 away from the spindle housing 100. The inner side of the annular oil baffle 300 is connected to the spindle 101, and the outer side of the annular oil baffle 300 has an annular sealing plate 301 along its circumference. The annular sealing plate 301 is fitted with an annular sealing seat 200. The outer side wall of the annular sealing seat 200 is provided with a second annular sealing groove 202 along the circumference. The second annular sealing groove 202 is provided with an air inlet 203. The first annular sealing gasket 400 is provided on the end face of the spindle box 100 near the annular oil baffle 300 and extends along the circumference of the annular sealing plate 301. A first gap 401 is reserved between the first annular sealing gasket 400 and the end of the annular sealing plate 301 away from the annular oil baffle 300.

[0040] In this embodiment, first, the first annular sealing groove 201 and the outer side wall of the main shaft 101 can form a first annular sealing cavity, oil or air is injected into the first annular sealing cavity, and an oil seal or an air seal is formed in the first annular sealing cavity. Second, the main shaft 101 is provided with an annular oil baffle 300, the annular oil baffle 300 is provided with an annular sealing plate 301, the annular oil baffle 300 and the annular sealing plate 301 act as a protective cover, which can reduce the entry of oil and fine particles from the gap between the annular sealing seat 200 and the main shaft 101. Then, the second annular sealing groove 202 and the inner side wall of the annular sealing plate 301 can form a second annular sealing cavity, air is injected into the second annular sealing cavity through the air inlet hole 203, and an air seal is formed in the second annular sealing cavity, which can further reduce the entry of oil and fine particles. In addition, a first annular sealing gasket 400 is arranged between the end face of the main shaft box 100 close to the annular oil baffle 300 and the end of the annular sealing plate 301 away from the annular oil baffle 300, the first annular sealing gasket 400 can act as a seal, which can further reduce the entry of oil and fine particles. Finally, when air is continuously injected into the second annular sealing cavity, the air will be discharged from the second annular sealing cavity due to pressure, a first gap 401 is reserved between the first annular sealing gasket 400 and the end of the annular sealing plate 301 away from the annular oil baffle 300, the discharged air can be sprayed from the first gap 401, and the sprayed air forms an air flow, which can further block the entry of oil and fine particles. In summary, by arranging multiple sealing structures, the sealing effect is better, and the entry of oil and fine particles from the outside into the bearing 103 area can be effectively prevented.

[0041] It should be noted that the main shaft box 100 is provided with a bearing 103, and the main shaft 101 is installed on the bearing 103. The main shaft 101 can be a workpiece spindle for installing a workpiece, or can be other spindles, for example, a tool spindle for installing a tool. One end of the main shaft 101 for installing the workpiece can be defined as the installation end, and the installation end can extend out of the main shaft box 100 to facilitate the installation of the workpiece. The annular sealing seat 200 can be installed on or directly welded on the end face of the end of the main shaft box 100 close to the installation end of the main shaft 101. Since the annular sealing seat 200 does not move relative to the main shaft box 100, it is difficult for oil and fine particles to enter from the gap between the annular sealing seat 200 and the main shaft box 100. Therefore, the sealing requirement between the annular sealing seat 200 and the main shaft box 100 is low, and a common sealing ring can be provided between the annular sealing seat 200 and the main shaft box 100. When the annular sealing seat 200 and the main shaft box 100 are welded together, or the end faces of the annular sealing seat 200 and the main shaft box 100 are closely fitted, the sealing ring can also not be provided. The annular sealing seat 200 can be provided with a through hole communicating with the first annular sealing cavity, so as to facilitate the injection of oil or air into the first annular sealing cavity. In the axial direction of the main shaft 101, the annular sealing seat 200 is closer to the installation end of the main shaft 101 than the bearing 103, so as to facilitate the sealing function after injecting oil or air into the first annular sealing cavity.

[0042] It can be understood that the inner side of the annular oil baffle 300 can be mounted on or directly welded on the end of the main shaft 101 mounting end, and the annular oil baffle 300 is located at the end of the annular sealing seat 200 away from the main shaft box 100, thereby just being able to play the role of a protective cover to avoid oil or fine particles from directly splashing into the gap between the annular sealing seat 200 and the main shaft 101. Since the annular oil baffle 300 and the main shaft 101 do not move relative to each other, and it is difficult for oil and fine particles to enter from the gap between the annular oil baffle 300 and the main shaft 101, the sealing requirement between the annular oil baffle 300 and the main shaft 101 is lower, and a common sealing ring can be set. When the annular oil baffle 300 and the main shaft 101 are welded together, the annular oil baffle 300 and the main shaft 101 can also not be provided with a sealing ring. The inner side of the annular sealing plate 301 needs to coincide with the projection of the outer side of the main shaft box 100 in the axial direction of the main shaft 101, and the first annular sealing gasket 400 is located between the end face of the main shaft box 100 and the end of the annular sealing plate 301 away from the annular oil baffle 300. The first annular sealing gasket 400 not only plays a sealing role, but also, by designing the size of the first gap 401, the air discharged in the second annular sealing cavity can form an air flow when passing through the first gap 401, the air flow is sprayed outward, thereby just being able to block the entry of oil and fine particles, and the sealing effect is better. In addition, by setting the first gap 401, the frictional resistance and wear between the annular sealing plate 301 and the first annular sealing gasket 400 can be reduced when the annular sealing plate 301 rotates with the main shaft 101.

[0043] In some embodiments of the present application, as shown in Figure 3 and Figure 4 The end face of the annular sealing seat 200 close to the annular oil baffle 300 is provided with a second annular sealing gasket 500 in the circumferential direction, and the second annular sealing gasket 500 is attached to the annular oil baffle 300; or a second gap 501 is reserved between the second annular sealing gasket 500 and the annular oil baffle 300, and the size of the second gap 501 is smaller than the size of the first gap 401. The second annular sealing gasket 500 can further play a sealing role. The oil and fine particles entering from the gap between the annular sealing plate 301 and the main shaft box 100 need to pass through the first annular sealing gasket 400, the second annular sealing groove 202, the second annular sealing gasket 500, and the first annular sealing groove 201, etc. sealing structure, to enter the bearing 103 position, and the sealing effect is better.

[0044] It should be noted that the second annular sealing gasket 500 can be directly attached to the end surface of the annular oil baffle 300 close to the annular sealing seat 200, in which case the sealing effect is better. In addition, a second gap 501 can also be reserved between the second annular sealing gasket 500 and the end surface of the annular oil baffle 300 close to the annular sealing seat 200, in which case the frictional resistance and wear between the annular oil baffle 300 and the second annular sealing gasket 500 can be reduced when the annular oil baffle 300 rotates with the main shaft 101. When the second gap 501 is formed, in order to avoid most of the air discharged from the second annular sealing cavity being discharged from the second gap 501, resulting in the air discharged from the first gap 401 being unable to form an air flow, in the present embodiment, the size of the second gap 501 needs to be smaller than the size of the first gap 401, so that only a small part of the air is discharged from the second gap 501, and most of the air is still discharged from the first gap 401 to form an air flow.

[0045] In some embodiments of the present application, the first annular sealing gasket 400 and the second annular sealing gasket 500 are both made of a guide rail soft belt. In this way, not only is it convenient to disassemble and assemble, but also it is convenient to replace when wear occurs after working for a long time. In addition, since the guide rail soft belt has elastic and soft properties, when debris such as abrasive particles enter the first gap 401 and the second gap 501, they can be trapped in the first annular sealing gasket 400 and the second annular sealing gasket 500, thereby reducing the wear of the first annular sealing gasket 400 and the second annular sealing gasket 500, improving wear resistance, and prolonging service life. In addition, the first annular sealing gasket 400 and the second annular sealing gasket 500 can be elastically deformed, thereby not only reducing the impact and vibration between the annular oil baffle 300 and the annular sealing seat 200, and the impact and vibration between the annular sealing plate 301 and the main shaft box 100, but also reducing the required assembly precision between the annular oil baffle 300 and the annular sealing seat 200 in the axial direction of the main shaft 101, and the required assembly precision between the annular sealing plate 301 and the main shaft box 100. Of course, in other embodiments of the present application, the first annular sealing gasket 400 and the second annular sealing gasket 500 can also be made of other materials, such as elastic rubber.

[0046] In some embodiments of the present application, the size of the first gap 401 is 0.015mm-0.02mm. In this way, the sealing effect is not reduced due to the size of the first gap 401 being too large, and the air flow cannot be formed. In addition, the air cannot pass through too little due to the size of the first gap 401 being too small, so that the formed air flow is too small to block the oil and dirt from entering. Furthermore, the annular sealing plate 301 does not touch the first annular sealing gasket 400 to cause friction resistance and wear due to the size of the first gap 401 being too small. The size of the second gap 501 is 0.005mm-0.01mm. In this way, the sealing effect is not reduced due to the size of the second gap 501 being too large.

[0047] In some embodiments of the present application, as shown in Figure 3 and Figure 4 , the width of the first annular sealing gasket 400 in the radial direction is smaller than the width of the second annular sealing gasket 500 in the radial direction. In this way, it is more difficult for the gas to pass through the second gap 501 than the first gap 401, and most of the air discharged from the second annular sealing cavity can pass through the first gap 401 to form an air flow that blocks the oil and dirt from entering. It should be noted that the ratio of the width of the second annular sealing gasket 500 in the radial direction to the width of the first annular sealing gasket 400 in the radial direction can be greater than 1 times and less than 1.5 times.

[0048] In some embodiments of the present application, as shown in Figure 3 and Figure 4 , the annular sealing seat 200 is provided with an annular oil collecting groove 204 near the end face of the annular oil baffle 300 in the circumferential direction, the annular oil collecting groove 204 is located on the inner side of the second annular sealing gasket 500, and the annular oil collecting groove 204 is provided with an oil discharge hole 205. In this way, even if a small amount of oil passes through the first annular sealing gasket 400, the second annular sealing groove 202 and the second annular sealing gasket 500, these oils will enter the annular oil collecting groove 204 and be discharged through the oil discharge hole 205, and are not easy to enter the gap between the annular sealing seat 200 and the main shaft 101, and then enter the bearing 103 position, so that the sealing effect of the present application is better.

[0049] In some embodiments of the present application, as shown in Figure 3 and Figure 4 , the annular sealing seat 200 is provided with an annular sealing plug 206 near the end face of the annular oil baffle 300 in the circumferential direction, the annular sealing plug 206 is located on the inner side of the annular oil collecting groove 204, the annular oil baffle 300 is provided with an annular sealing plug groove 302 corresponding to the annular sealing plug 206, and the annular sealing plug 206 is inserted into the annular sealing plug groove 302.

[0050] In the embodiment, when the oil drain hole 205 is blocked to cause more oil in the annular oil collecting groove 204, the cooperation between the annular sealing slot 302 and the annular sealing plug 206 can further prevent the oil from entering the gap between the annular sealing seat 200 and the main shaft 101. Even if a small amount of oil enters the gap between the annular sealing slot 302 and the annular sealing plug 206, the cross section of the gap between the annular sealing slot 302 and the annular sealing plug 206 is in a bent shape, so that it is difficult for the oil to pass through the gap between the annular sealing slot 302 and the annular sealing plug 206, and the oil is still difficult to enter the gap between the annular sealing seat 200 and the main shaft 101, thereby achieving better sealing effect.

[0051] In some embodiments of the present application, as shown in Figure 3 and Figure 4 , a labyrinth seal ring 600 is arranged between the annular sealing slot 302 and the annular sealing plug 206, and the labyrinth seal ring 600 extends along the circumference of the annular sealing plug 206. Even if a small amount of oil enters the gap between the annular sealing slot 302 and the annular sealing plug 206, since the labyrinth seal ring 600 is arranged between the annular sealing slot 302 and the annular sealing plug 206, the labyrinth seal ring 600 can also prevent the oil from flowing continuously, and the oil is still difficult to enter the gap between the annular sealing seat 200 and the main shaft 101, thereby achieving better sealing effect. It should be noted that the labyrinth seal ring 600 is a common sealing structure, which will not be described here.

[0052] In some embodiments of the present application, as shown in Figure 3 and Figure 4 , the inner side of the first annular sealing gasket 400 extends to the outer side of the end of the annular sealing seat 200 away from the annular oil baffle 300, that is, along the axial direction of the main shaft 101, the projection of the inner side of the first annular sealing gasket 400 coincides with the projection of the outer side of the annular sealing seat 200, and thus the first annular sealing gasket 400 can just cover the gap between the annular sealing plate 301 and the annular sealing seat 200. In the embodiment, the arrangement makes the first annular sealing gasket 400 have better effect of preventing oil and fine particles from entering the gap between the annular sealing plate 301 and the annular sealing seat 200, thereby achieving better sealing effect, and the air discharged from the second annular sealing cavity can more smoothly enter the first gap 401 to form air flow.

[0053] It should be noted that the end face of the main shaft box 100 close to the annular oil baffle 300 can be provided with an annular sink, and the first annular sealing gasket 400 can be installed in the annular sink, so that the first annular sealing gasket 400 is more stable, and the oil and the fine particles need to pass through the gap between the end face of the first annular sealing gasket 400 and the stepped face of the annular sink, and the gap between the side face of the first annular sealing gasket 400 and the side face of the annular sink, to enter, which is more difficult, so that the sealing effect is better.

[0054] In some embodiments of the present application, as shown in Figure 3 and Figure 4 , the outer side of the end face of the main shaft 101 is provided with an annular sink in the circumferential direction, and the inner side of the annular oil baffle 300 extends into the annular sink. That is, in the axial direction of the main shaft 101, the projection of the gap between the main shaft 101 and the annular sealing seat 200 is located in the projection of the annular oil baffle 300. In this way, the annular oil baffle 300 can cover the gap between the main shaft 101 and the annular sealing seat 200, avoiding the direct exposure of the gap between the main shaft 101 and the annular sealing seat 200, so as to prevent the oil and the fine particles from directly entering the gap between the main shaft 101 and the annular sealing seat 200, and the sealing effect is better. In addition, the oil and the fine particles need to pass through the gap between the inner side wall of the annular oil baffle 300 and the side wall of the annular sink, and the gap between the end face of the annular oil baffle 300 and the stepped face of the annular sink, to enter the gap between the main shaft 101 and the annular sealing seat 200, which is very difficult to enter, and the sealing effect is better.

[0055] In some embodiments of the present application, as shown in Figure 3 and Figure 4 , a sealing ring can be arranged between the inner side of the annular oil baffle 300 and the side wall of the annular sink, and a sealing ring can be arranged between the end face of the annular oil baffle 300 and the stepped face of the annular sink. In this way, the sealing effect is better.

[0056] In some embodiments of the present application, as shown in Figure 3 and Figure 4 , the outer side of the end of the annular sealing plate 301 away from the annular oil baffle 300 is provided with an annular extension plate 303 in the circumferential direction, and the annular extension plate 303 is located on the outer side of the main shaft box 100. The annular extension plate 303 can cover the gap between the end of the annular sealing plate 301 away from the annular oil baffle 300 and the first annular sealing gasket 400, avoiding the direct exposure of the gap between the end of the annular sealing plate 301 away from the annular oil baffle 300 and the first annular sealing gasket 400, so that the oil and the fine particles are easy to enter, especially as Figure 3As shown, when the main shaft 101 is arranged transversely, the annular extension plate 303 is arranged just to avoid the oil and fine dirt from falling directly into the gap between the end of the annular sealing plate 301 away from the annular oil pan 300 and the first annular sealing pad 400, so that the sealing effect is better.

[0057] In some embodiments of the present application, as shown in Figure 4 and Figure 2 Figure 3 Figure 4 As shown, the end surface of the annular sealing seat 200 away from the annular oil pan 300 is circumferentially provided with an annular gas supply groove 207, and the annular gas supply groove 207 and the end surface of the main shaft box 100 close to the annular oil pan 300 enclose a annular gas supply cavity, the annular gas supply cavity is connected with a gas supply hole 102, the gas inlet hole 203 is provided with a plurality of and arranged along the circumference of the second annular sealing groove 202, and the plurality of gas inlet holes 203 are all connected with the annular gas supply cavity. The gas supply hole 102 supplies gas into the annular gas supply cavity, and the annular gas supply cavity supplies gas into the second annular sealing groove 202 through the plurality of gas inlet holes 203, so that the second annular sealing groove 202 is uniformly supplied with gas, thereby ensuring uniform gas pressure and better gas sealing effect, and the gas from the gas source first enters the annular gas supply cavity through a gas supply hole 102, and then enters the second annular sealing groove 202 through the plurality of gas inlet holes 203. Compared with the plurality of gas inlet holes 203 directly connected with the gas source, in the present application, the gas inlet hole 203 is arranged more simply, the required length is shorter, and the processing is more convenient. In addition, the annular gas supply groove 207 and the end surface of the main shaft box 100 close to the annular oil pan 300 enclose the annular gas supply cavity, and then only the annular gas supply groove 207 needs to be machined on the end surface of the annular sealing seat 200 away from the annular oil pan 300, compared with arranging the annular gas supply cavity in the annular sealing seat 200, the processing is more convenient, more time-saving and labor-saving, and it is also more convenient to clean.

[0058] It should be noted that the gas supply hole 102 can be arranged on the main shaft box 100 or on the annular sealing seat 200. In addition, the annular gas supply cavity can also be arranged directly in the annular sealing seat 200.

[0059] The machine tool according to the second aspect of the present application comprises the main shaft sealing structure according to the first aspect of the present application.

[0060] In the embodiment, by adopting the spindle sealing structure of the first aspect, first, the first annular sealing groove 201 and the outer side wall of the spindle 101 can form a first annular sealing cavity, and oil or air is injected into the first annular sealing cavity, and the first annular sealing cavity can form an oil seal or an air seal, second, the spindle 101 is provided with an annular oil baffle 300, the annular oil baffle 300 is provided with an annular sealing plate 301, the annular oil baffle 300 and the annular sealing plate 301 act as a protective cover, which can reduce the oil and fine particles from the gap between the annular sealing seat 200 and the spindle 101, then, the second annular sealing groove 202 and the inner side wall of the annular sealing plate 301 can form a second annular sealing cavity, air is injected into the second annular sealing cavity through the air inlet hole 203, and the second annular sealing cavity can form an air seal, which can further reduce the oil and fine particles, in addition, the first annular sealing pad 400 is arranged between the end face of the spindle box 100 close to the annular oil baffle 300 and the end of the annular sealing plate 301 away from the annular oil baffle 300, the first annular sealing pad 400 can act as a sealing function, and further reduce the oil and fine particles, finally, when the air is continuously injected into the second annular sealing cavity, the air will be discharged from the second annular sealing cavity under pressure, the first gap 401 is reserved between the first annular sealing pad 400 and the end of the annular sealing plate 301 away from the annular oil baffle 300, and the discharged air can be sprayed from the first gap 401, and the sprayed air forms an air flow to further block the oil and fine particles, in summary, by arranging multiple sealing structures, the sealing effect is better, and the oil and fine particles from the outside can be effectively prevented from entering the bearing 103 area and affecting the bearing 103.

[0061] It should be noted that since the machine tool can adopt the spindle sealing structure of the first aspect, it at least has all the beneficial effects brought by the technical solutions of the first aspect, and these additional beneficial effects will not be described here.

[0062] It can be understood that the machine tool of the second aspect of the present application can be a grinding machine tool, and can be other suitable machine tools, which will not be described here.

[0063] The other configurations and operations of the machine tool according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

[0064] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A spindle seal structure, characterized by, The main shaft sealing structure comprises a main shaft box, a main shaft, a ring-shaped sealing seat, a ring-shaped oil baffle, a first ring-shaped sealing gasket, a second ring-shaped sealing gasket, a ring-shaped oil collecting groove, a ring-shaped sealing plug, a labyrinth seal ring, and a ring-shaped extension plate. The main shaft box is provided with the main shaft. The ring-shaped sealing seat is provided on the main shaft box and covers the main shaft. The inner side wall of the ring-shaped sealing seat is provided with a first ring-shaped sealing groove in the circumferential direction. The ring-shaped oil baffle is provided at one end of the ring-shaped sealing seat away from the main shaft box. The inner side of the ring-shaped oil baffle is connected to the main shaft. The outer side of the ring-shaped oil baffle is provided with a ring-shaped sealing plate in the circumferential direction. The ring-shaped sealing plate covers the ring-shaped sealing seat. The outer side wall of the ring-shaped sealing seat is provided with a second ring-shaped sealing groove in the circumferential direction.

2. The spindle seal structure of claim 1, wherein The second ring-shaped sealing groove is provided with an air inlet hole.

3. The spindle seal structure according to claim 1 or 2, characterized in that, The first ring-shaped sealing gasket is provided on the end face of the main shaft box close to the ring-shaped oil baffle and extends in the circumferential direction of the ring-shaped sealing plate.

4. The spindle seal structure according to claim 1 or 2, characterized in that, A first gap is reserved between the first ring-shaped sealing gasket and the end of the ring-shaped sealing plate away from the ring-shaped oil baffle.

5. The spindle seal structure according to claim 1 or 2, characterized by, The end face of the ring-shaped sealing seat close to the ring-shaped oil baffle is provided with a second ring-shaped sealing gasket in the circumferential direction.

6. A machine tool characterized by comprising: The second ring-shaped sealing gasket is attached to the ring-shaped oil baffle. Alternatively, a second gap is reserved between the second ring-shaped sealing gasket and the ring-shaped oil baffle. The size of the second gap is smaller than that of the first gap. The end face of the ring-shaped sealing seat close to the ring-shaped oil baffle is provided with a ring-shaped oil collecting groove in the circumferential direction. The ring-shaped oil collecting groove is located inside the second ring-shaped sealing gasket. The ring-shaped oil collecting groove is provided with an oil outlet hole. The end face of the ring-shaped sealing seat close to the ring-shaped oil baffle is provided with a ring-shaped sealing plug in the circumferential direction. The ring-shaped sealing plug is located inside the ring-shaped oil collecting groove. The ring-shaped oil baffle is correspondingly provided with a ring-shaped sealing slot. The ring-shaped sealing plug is inserted into the ring-shaped sealing slot. A labyrinth seal ring is provided between the ring-shaped sealing slot and the ring-shaped sealing plug. The labyrinth seal ring extends in the circumferential direction of the ring-shaped sealing slot. The width of the first ring-shaped sealing gasket in the radial direction is smaller than that of the second ring-shaped sealing gasket. The inner side of the first ring-shaped sealing gasket extends to the end of the ring-shaped sealing seat away from the ring-shaped oil baffle. The outer side of the end face of the main shaft is provided with a ring-shaped sink in the circumferential direction. The inner side of the ring-shaped oil baffle extends to the ring-shaped sink. The outer side of the end of the ring-shaped sealing plate away from the ring-shaped oil baffle is provided with a ring-shaped extension plate in the circumferential direction. The ring-shaped extension plate is located outside the main shaft box. The end face of the ring-shaped sealing seat away from the ring-shaped oil baffle is provided with a ring-shaped air supply groove in the circumferential direction. The ring-shaped air supply groove and the end face of the main shaft box close to the ring-shaped oil baffle form a ring-shaped air supply cavity. The ring-shaped air supply cavity is connected to an air supply hole. The air inlet hole is provided with multiple air inlet holes arranged in the circumferential direction of the second ring-shaped sealing groove. The multiple air inlet holes are all connected to the ring-shaped air supply cavity. The main shaft sealing structure comprises a main shaft sealing structure according to any one of claims 1 to 5.

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