Shaft sealing structure and machining equipment

Abstract

The embodiment of the invention discloses a shaft sealing structure and machining equipment, the shaft sealing structure comprises a shaft body and a connecting assembly, the connecting assembly sleeves the shaft body and is used for fixing the position of the shaft body, the shaft body is rotatably arranged and is provided with a first end extending out of the connecting assembly, and a ventilation gap is formed between the peripheral surface of the shaft body and the connecting assembly; an air inlet channel with an air inlet end and an air outlet end is formed in the connecting assembly, the air inlet end is communicated with an air source, the air outlet end is communicated with the ventilation gap, a first blocking structure corresponding to the air outlet end in position is arranged on the peripheral face of the shaft body, and a second blocking structure is arranged on the side, away from the first end, of the first blocking structure and on the peripheral face of the shaft body. The first blocking structure and the second blocking structure are used for intercepting and collecting impurities entering the ventilation gap. According to the technical scheme, impurities are prevented from entering the spindle, and the sealing effect of the spindle is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of processing equipment, and in particular to a shaft sealing structure and processing equipment. Background Art

[0002] An electric spindle, also known as an integrated motor spindle, is a mechanical component that integrates a motor directly into the spindle, so that the torque of the motor can directly act on the spindle. Electric spindles are widely used in high-speed, high-precision machining centers. During normal use, if impurities such as cutting fluid and iron slag enter the inside of the electric spindle, it will cause corrosion and wear of the spindle, which may cause vibration of the spindle, affect the working accuracy and life of the spindle, or even cause damage to the spindle. The inside of the spindle here refers to the area where the motor is integrated into the spindle. In related technologies, a labyrinth seal structure is usually used. The labyrinth seal structure usually uses staggered seals to form a tortuous or stepped sealing channel to form a multi-layer barrier for impurities to achieve a dustproof and waterproof effect. However, the labyrinth seal structure still has a certain risk of leakage, and it is difficult to ensure that impurities will not enter the inside of the spindle. Summary of the invention

[0003] The object of the present invention is to provide a shaft sealing structure and processing equipment to solve the problem in the related art that it is difficult to ensure the sealing effect of the electric spindle.

[0004] According to a first aspect of an embodiment of the present application, a shaft sealing structure is provided, comprising a shaft body and a connecting assembly, wherein the connecting assembly is sleeved on the shaft body for fixing the position of the shaft body, the shaft body is rotatably arranged and has a first end extending from the connecting assembly, a ventilation gap is formed between the outer peripheral surface of the shaft body and the connecting assembly, an air inlet channel having an air inlet end and an air outlet end is formed in the connecting assembly, the air inlet end is communicated with an air source, and the air outlet end is communicated with the ventilation gap,

[0005] Among them, a first blocking structure corresponding to the air outlet end is arranged on the outer circumferential surface of the shaft body, and a second blocking structure is arranged on the outer circumferential surface of the shaft body on the side of the first blocking structure away from the first end. The first blocking structure and the second blocking structure are used to intercept and collect impurities entering the ventilation gap.

[0006] Optionally, the first blocking structure is a first groove body opened on the outer peripheral surface of the shaft body, the outer peripheral surface of the shaft body has a first surface inclined or perpendicular to the axial direction of the shaft body, the first surface and the connecting component form the ventilation gap, and the second blocking structure is a second groove body opened on the first surface.

[0007] Optionally, the first groove body is configured as a toothed groove, the first groove body having a second surface perpendicular to the axial direction of the shaft body and a third surface inclined to the circumferential direction of the shaft body, wherein the second surface is in the same plane as the plane where the center line of the air inlet channel is located, and the third surface is located on the side of the second surface close to the first end.

[0008] Optionally, in the first blocking structure, a plurality of first grooves are spaced apart in the axial direction of the shaft body, and the second surface of at least one of the first grooves is in the same plane as the plane where the center line of the air inlet channel is located.

[0009] Optionally, a flange is formed on the outer circumferential surface of the shaft body, and the first surface is formed on the outer circumferential surface of the flange; and / or,

[0010] A groove is formed on the outer peripheral surface of the shaft body, and the first surface is formed on the inner wall surface of the groove.

[0011] Optionally, the outer peripheral surface of the flange and / or the inner wall surface of the groove also has a fourth surface parallel to the axial direction of the shaft body, the fourth surface and the connecting assembly form the ventilation gap, and a third blocking structure is arranged on the fourth surface, and the third blocking structure is a fourth groove body opened on the fourth surface.

[0012] Optionally, the first groove body, the second groove body and the fourth groove body are respectively configured as annular grooves extending along the circumference of the shaft body.

[0013] Optionally, a third groove body connected to the air inlet channel is provided at the end of the air outlet end, and in the circumferential direction of the shaft body, the maximum dimension of the third groove body is greater than the maximum dimension of the first blocking structure, and in the axial direction of the shaft body, the maximum dimension of the third groove body is greater than or equal to the maximum dimension of the first blocking structure.

[0014] Optionally, the connecting assembly includes a bearing seat, a flange and an end cover, the bearing seat is connected to the end cover via the flange, a plurality of bearings are embedded in the bearing seat, and the shaft body is penetrated by the plurality of bearings so that the shaft body can be rotatably arranged.

[0015] Optionally, the air inlet channel includes a first sub-channel, a second sub-channel and a third sub-channel, wherein the first sub-channel is formed in the bearing seat, the second sub-channel is formed in the flange, the third sub-channel is formed in the end cover, one end of the first sub-channel is connected to the air source to form the air inlet end, the first sub-channel is connected to the second sub-channel, the second sub-channel is connected to the third sub-channel, and one end of the third sub-channel is connected to the ventilation gap to form the air outlet.

[0016] Optionally, the diameter of the first sub-channel is greater than the diameter of the second sub-channel, and / or the diameter of the second sub-channel is greater than the diameter of the third sub-channel.

[0017] According to a second aspect of an embodiment of the present application, a processing device is provided, comprising the shaft sealing structure described in any one of the above.

[0018] The solution provided by the present invention has the following beneficial effects compared with the prior art:

[0019] Through the above technical solution, when the shaft body in the present application is the main shaft of the electric spindle, at this time, the first end of the shaft body is the end away from the inside of the main shaft, and the second blocking structure is arranged on the side of the first blocking structure away from the first end, that is, the second blocking structure is arranged on the side of the first blocking structure facing the inside of the main shaft. When the airflow generated by the air source can enter the ventilation gap between the shaft body and the connecting component through the air outlet end of the air inlet channel, the airflow will flow along the first end toward the shaft body and form an air curtain, which can isolate impurities such as cutting fluid, iron slag fragments, etc., and prevent impurities from entering the inside of the main shaft from the first end of the shaft body. Since the position of the first blocking structure corresponds to the air outlet end, when some impurities overcome the air curtain and enter the ventilation gap from the first end, the impurities will first be blown into the first blocking structure by the airflow, and the first blocking structure can intercept and collect the impurities. At the same time, when the airflow generated by the air source can enter the ventilation gap between the shaft body and the connecting component through the air outlet end of the air inlet channel, part of the airflow will flow along the shaft body in the direction away from the first end, that is, part of the airflow will move toward the inside of the main shaft. When the first blocking structure fails to intercept impurities, the impurities will move with the airflow flowing in the direction away from the first end. At this time, the impurities will pass through the second blocking structure and be intercepted and collected by the second blocking structure. In this way, the air curtain formed in the ventilation gap can prevent impurities from entering the inside of the main shaft. The first blocking structure and the second blocking structure provided on the outer peripheral surface of the shaft body can further intercept and collect impurities entering the ventilation gap, further preventing impurities from entering the inside of the main shaft, and ensuring the sealing effect of the shaft body. At the same time, through the design of the air curtain, the first blocking structure and the second blocking structure, the shaft sealing structure no longer needs to arrange staggered seals when using a labyrinth sealing structure as in the related art, effectively reducing the material cost and assembly cost of the shaft sealing structure. In addition, through the design of the air curtain, the first blocking structure and the second blocking structure, the connection interference relationship between the connecting component and the shaft body due to sealing is also reduced, which is convenient for the design and processing of the connecting component and the shaft body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0021] Figure 1 is a structural schematic diagram of a shaft sealing structure provided in an embodiment of the present application;

[0022] Figure 2 yes Figure 1 Enlarged view of part A.

[0023] In the figure: 1-main shaft, 11-first trough body, 12-first surface, 13-second trough body, 14-second surface, 15-third surface, 16-flange, 17-fourth surface, 18-fourth trough body 18, 2-connecting assembly, 21-air inlet channel, 22-air inlet end, 23-air outlet end, 24-third trough body, 25-bearing seat, 26-flange, 27-end cover, 31-first sub-channel, 32-second sub-channel, 33-third sub-channel, 34-plug.

[0024] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0026] It should be understood that the "multiple" mentioned herein refers to two or more. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in order to facilitate the clear description of the technical solution of the embodiments of the present application, in the embodiments of the present application, the words "first", "second" and the like are used to distinguish between the same items or similar items with basically the same functions and effects. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like do not limit them to be necessarily different.

[0027] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inside" and "outside" is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "contacted", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The existing labyrinth sealing structure still has a certain risk of leakage, and it is difficult to ensure that impurities will not enter the interior of the shaft body 1. The present application provides a shaft sealing structure that can effectively ensure the sealing effect on the shaft body 1 and can effectively reduce the material cost and assembly cost of the shaft sealing structure. Specifically, the present application can prevent impurities from entering the interior of the shaft body 1 by forming an air curtain in the ventilation gap, and can make the impurities entering the ventilation gap stay in the first slot body 11 or the second slot body 13 through the first slot body 11 and the second slot body 13, further preventing impurities from entering the interior of the shaft body 1, and further ensuring the sealing effect of the shaft body 1.

[0030] According to a first aspect of the embodiment of the present disclosure, Figure 1 and Figure 2As shown, a shaft sealing structure is provided, including a shaft body 1 and a connecting component 2, the connecting component 2 is sleeved on the shaft body 1 for fixing the position of the shaft body 1, the shaft body 1 is rotatably arranged and has a first end extending out of the connecting component 2, a ventilation gap is formed between the outer peripheral surface of the shaft body 1 and the connecting component 2, an air inlet channel 21 having an air inlet end 22 and an air outlet end 23 is formed in the connecting component 2, the air inlet end 22 is connected to an air source, and the air outlet end 23 is connected to the ventilation gap, wherein a first blocking structure is arranged on the outer peripheral surface of the shaft body 1 at a position corresponding to the air outlet end 23, and a second blocking structure is arranged on the outer peripheral surface of the shaft body 1 on a side of the first blocking structure away from the first end, the first blocking structure and the second blocking structure are used to intercept and collect impurities entering the ventilation gap.

[0031] Through the above technical solution, when the shaft body 1 in the present application is the main shaft of the electric spindle, at this time, the first end of the shaft body 1 is the end away from the inside of the main shaft, and the second blocking structure is arranged on the side of the first blocking structure away from the first end, that is, the second blocking structure is arranged on the side of the first blocking structure facing the inside of the main shaft. When the airflow generated by the air source can enter the ventilation gap between the shaft body 1 and the connecting component 2 through the air outlet end 23 of the air inlet channel 21, the airflow will flow along the first end toward the shaft body 1 and form an air curtain, which can isolate impurities such as cutting fluid and iron slag fragments, and prevent impurities from entering the inside of the main shaft from the first end of the shaft body 1. Since the position of the first blocking structure corresponds to the air outlet end 23, when some impurities overcome the air curtain and enter the ventilation gap from the first end, the impurities will first be blown into the first blocking structure by the airflow, and the first blocking structure can intercept and collect the impurities. At the same time, when the airflow generated by the air source can enter the ventilation gap between the shaft body 1 and the connecting component 2 through the air outlet end 23 of the air inlet channel 21, part of the airflow will flow along the shaft body 1 in the direction away from the first end, that is, part of the airflow will move toward the inside of the main shaft. When the first blocking structure fails to intercept impurities, the impurities will move with the airflow flowing in the direction away from the first end. At this time, the impurities will pass through the second blocking structure and be intercepted and collected by the second blocking structure. In this way, the air curtain formed in the ventilation gap can prevent impurities from entering the inside of the main shaft. The first blocking structure and the second blocking structure provided on the outer peripheral surface of the shaft body 1 can further intercept and collect impurities entering the ventilation gap, further preventing impurities from entering the inside of the main shaft, and ensuring the sealing effect of the shaft body 1. At the same time, through the design of the air curtain, the first blocking structure and the second blocking structure, the shaft sealing structure no longer needs to arrange staggered seals when using a labyrinth sealing structure as in the related art, effectively reducing the material cost and assembly cost of the shaft sealing structure. Furthermore, through the design of the air curtain, the first blocking structure and the second blocking structure, the connection interference relationship between the connecting component 2 and the shaft body 1 due to sealing is also reduced, which facilitates the design and processing of the connecting component 2 and the shaft body 1.

[0032] It should be noted that the interior of the spindle mentioned above and below refers to the area in which the motor is integrated when the shaft body 1 in the present application is the spindle of an electric spindle. The shaft body 1 is rotatably arranged and has a first end extending from the connecting component 2. At this time, when the shaft body 1 in the present application is the spindle of an electric spindle, the other end of the shaft body 1 can be understood as integrating the motor and forming the interior of the spindle.

[0033] The first blocking structure may be a first slot body 11 provided on the outer peripheral surface of the shaft body 1, the outer peripheral surface of the shaft body 1 having a first surface 12 inclined or perpendicular to the axial direction of the shaft body 1, the first surface 12 and the connecting assembly 2 forming a ventilation gap, and the second blocking structure being a second slot body 13 provided on the first surface 12. In this way, the position of the air outlet 23 is aligned with the first slot body 11, the airflow flowing out of the air outlet 23 will first blow toward the first slot body 11, and the impurities will first be blown into the first slot body 11 by the airflow when passing through the first slot body 11. When the shaft body 1 rotates during use, the outer peripheral surface of the shaft body 1 has a circumferential speed, which can stir the airflow entering the first slot body to form a vortex, so that the impurities will stay in the first slot body 11 due to the cyclone generated in the first slot body 11, so that the first slot body 11 can intercept and collect the impurities in service. Since the first surface is inclined or perpendicular to the axial direction of the shaft body 1, when the airflow flows through the first surface 12, the change in the airflow direction will cause the airflow velocity to decrease. At this time, when the airflow passes through the second groove body 13, the airflow will also form a cyclone in the second groove body 13 and make the impurities in the airflow remain in the second groove body 13. The reduction in the airflow velocity also makes it easier for the impurities to stay in the second groove body 13, further preventing the impurities from entering the interior of the shaft body 1, so that the second groove body 13 can intercept and collect the impurities in the shaft body 1.

[0034] In some embodiments, the first groove body 11 can be configured as a toothed groove, and the first groove body 11 can have a second surface 14 perpendicular to the axial direction of the shaft body 1 and a third surface 15 inclined to the circumferential direction of the shaft body 1, wherein the second surface 14 is in the same plane as the plane where the center line of the air inlet channel 21 is located, and the third surface 15 is located on the side of the second surface 14 close to the first end.

[0035] In this way, through the cooperation of the second surface 14 and the third surface 15, the flow direction of the airflow flowing out from the air outlet end 23 can be distributed. When the airflow from the air outlet end 23 flows out and blows into the first slot body 11, since the third surface 15 is located on the side of the second surface 14 close to the first end, most of the airflow will flow out at the first end along the axial direction of the shaft body 1. In this way, in the area of ​​the shaft body 1 from the first slot body 11 to the first end of the shaft body 1, the strength of the air curtain is higher, and it is easier to prevent impurities from progressing from the first end of the shaft body 1 into the ventilation gap. At the same time, a part of the airflow will flow along the axial direction of the shaft body 1 toward the direction close to the second slot body 13, that is, toward the inside of the main shaft. Since the airflow is small, the flow rate of the airflow is relatively slow. When impurities overcome the air curtain between the first slot body 11 and the first end of the shaft body 1, when passing through the first surface 12 and the second slot body 13, the slower impurities will easily stay in the second slot body 13. In this way, while ensuring that the first groove body 11 can distribute the flow direction of the airflow, it can ensure that sufficient airflow can flow out from the first end, the air curtain in the area from the first groove body 11 to the inside of the shaft body 1 can have sufficient strength, and it can also ensure that a certain amount of airflow can flow along the shaft body 1 toward the inside of the main shaft, thereby driving impurities to be collected and intercepted by the second group of blocking structures.

[0036] In the first blocking structure, a plurality of first slot bodies 11 may be arranged at intervals in the axial direction of the shaft body 1, and the second surface 14 of at least one first slot body 11 is in the same plane as the plane where the center line of the air inlet channel 21 is located. In this way, while ensuring the effect of the first slot body 11 in distributing the flow direction of the airflow flowing out of the air outlet end 23, the plurality of first slot bodies 11 also increases the probability of impurities staying in the first slot body 11, further preventing impurities from entering the main shaft through the ventilation gap.

[0037] In some embodiments, a flange 16 may be formed on the outer circumference of the shaft body 1, and the first surface 12 is formed on the outer circumference of the flange 16; and / or, a groove is formed on the outer circumference of the shaft body 1, and the first surface 12 is formed on the inner wall of the flange 16. The design of the flange 16 and the groove facilitates processing on the shaft body 1. At the same time, when the airflow flows along the axial direction of the shaft body 1 toward the direction close to the second groove body 13, the flow direction of the airflow will change when passing through the flange and the groove, so that the speed of the airflow is reduced, and impurities in the airflow are more likely to stay in the second groove body 13 when passing through the second groove body 13 on the first surface 12. For details, please refer to Figure 1 and Figure 2 , taking the flange 16 formed on the outer circumference of the shaft body 1 as an example, at this time, the flange 16 is formed on the outer circumference of the shaft body 1, and the first surface 12 is formed on the outer circumference of the flange 16. Figure 1 and Figure 2The direction of the drawing is used as a reference. On the outer peripheral surface of the flange 16, there are two surfaces perpendicular to the axial direction of the shaft body 1, one surface is close to the first groove body 11, and the other surface is far away from the first groove body 11. Preferably, the first surface 12 can be the surface of the flange 16 close to the first groove body 11 and perpendicular to the axial direction of the shaft body 1, that is, the first surface 12 is Figure 2 The lower end surface of the middle flange 16.

[0038] The outer peripheral surface of the flange 16 and / or the inner wall surface of the fourth slot body may also have a fourth surface 17 parallel to the axial direction of the shaft body 1, and the fourth surface 17 forms a ventilation gap with the connecting assembly 2, and a fourth slot body 18 is provided on the fourth surface 17. In this way, when the airflow flows along the axial direction of the shaft body 1 toward the direction close to the second slot body 13, it will not only pass through the second slot body 13, but also pass through the fourth slot body 18. When the airflow passes through the fourth slot body 18 on the fourth surface 17, a cyclone will also be formed in the fourth slot body 18, and impurities in the airflow will also be more likely to stay in the fourth slot body 18. In this way, the fourth slot body 18 can work together with the first slot body 11 and the second slot body 13 to prevent impurities from entering the interior of the shaft body 1. After the impurities enter the ventilation gap, they will be collected and intercepted by the first slot body 11, the second slot body 13 and the fourth slot body 18 in turn, and a three-level blocking structure is formed on the outer peripheral surface of the shaft body 1 to further prevent impurities from entering the interior of the main shaft through the ventilation gap.

[0039] In the axial direction of the shaft body 1, a plurality of first slot bodies 11 may be arranged at intervals, and in the axial direction of the shaft body 1, the third slot body 24 is covered on the plurality of first slot bodies 11. In this way, when there are a plurality of first slot bodies 11, the third slot body 24 is covered on the plurality of first slot bodies 11, so that the airflow blown out of the air outlet end 23 can pass through the third slot body 24 and blow to the plurality of first slot bodies 11 at the same time, ensuring the effect of the plurality of first slot bodies 11 distributing the flow direction of the airflow flowing out of the air outlet end 23, and further ensuring the effect of the third slot body 24 increasing the uniformity of the air curtain in the ventilation gap. Figure 2 As a reference and Figure 2 As an example, Figure 2 The upper and lower directions are the axial directions of the shaft body 1. When there are multiple first grooves 11, the distance between the edge of the second surface 14 of the uppermost first groove body 11 and the edge of the third surface 15 of the lowermost first groove body 11 is X, and the distance between the uppermost edge and the lowermost edge of the third groove body 24 is Y. The third groove body 24 mentioned above is covered on multiple first groove bodies 11, which means that the third groove body 24 can cover multiple first groove bodies 11 at the same time, that is, in the axial direction of the shaft body 1, the distance Y should be greater than or equal to the distance X, to ensure that the third groove body 24 is covered on multiple first groove bodies 11, that is, the third groove body 24 can cover multiple first groove bodies 11 at the same time.

[0040] In some embodiments, the first slot body 11, the second slot body 13, and the fourth slot body can be respectively configured as annular grooves extending along the circumference of the shaft body 1. The annular grooves can make the first slot body 11, the second slot body 13, and the fourth slot body cover a larger range, ensuring the use effect of the first slot body 11, the second slot body 13, and the fourth slot body for collecting impurities in the airflow to prevent the impurities from entering the shaft body 1.

[0041] The end of the air outlet 23 may be provided with a third slot body 24 connected to the air inlet channel 21. In the circumferential direction of the shaft body 1, the maximum size of the third slot body 24 is greater than the maximum size of the first slot body 11, and in the axial direction of the shaft body 1, the maximum size of the third slot body 24 is greater than or equal to the maximum size of the first slot body 11. The third slot body 24 can increase the uniformity of the air curtain in the ventilation gap. When the airflow flows out from the air outlet 23, it will first fill the third slot body 24, then flow out along the ventilation gap and blow toward the first slot body 11. Compared with the airflow blown out from the air outlet 23 directly blowing toward the first slot body 11 and the outer circumferential surface of the shaft body 1, the third slot body 24 can provide a certain buffer space for the airflow, so that the airflow will be more uniform when flowing out, thereby ensuring the uniformity of the air curtain. At the same time, in the circumferential direction of the shaft body 1, the maximum size of the third slot body 24 can be greater than the maximum size of the first slot body 11, and in the axial direction of the shaft body 1, the maximum size of the third slot body 24 can be greater than or equal to the maximum size of the second slot body 13, so as to ensure the uniformity of the air curtain. Figure 2 As a reference and Figure 2 As an example, Figure 2 The middle up-down direction is the axial direction of the shaft body 1, thus preventing the third slot body 24 from being too small and affecting the outflow of airflow.

[0042] As described above, in the axial direction of the shaft body 1, a plurality of first slot bodies 11 may be arranged at intervals. In this case, in the case of a plurality of first slot bodies 11, the third slot body 24 is covered on the plurality of first slot bodies 11 in the axial direction of the shaft body 1. In this way, when there are a plurality of first slot bodies 11, the third slot body 24 is covered on the plurality of first slot bodies 11, so that the airflow blown out from the air outlet end 23 can pass through the third slot body 24 and blow to the plurality of first slot bodies 11 at the same time, thereby ensuring the effect of the plurality of first slot bodies 11 distributing the flow direction of the airflow flowing out from the air outlet end 23, and further ensuring the effect of the third slot body 24 in increasing the uniformity of the air curtain in the ventilation gap. Figure 2 As a reference and Figure 2 As an example, Figure 2The upper and lower directions are the axial directions of the shaft body 1. When there are multiple first grooves 11, the distance between the edge of the second surface 14 of the uppermost first groove body 11 and the edge of the third surface 15 of the lowermost first groove body 11 is X, and the distance between the uppermost edge and the lowermost edge of the third groove body 24 is Y. The third groove body 24 mentioned above is covered on multiple first groove bodies 11, which means that the third groove body 24 can cover multiple first groove bodies 11 at the same time, that is, in the axial direction of the shaft body 1, the distance Y should be greater than or equal to the distance X, to ensure that the third groove body 24 is covered on multiple first groove bodies 11, that is, the third groove body 24 can cover multiple first groove bodies 11 at the same time.

[0043] At the same time, when the first groove body 11 is an annular groove as described above, the third groove body 24 can also be constructed as an annular groove opened at the air outlet end 23. Since the third groove body 24 is opened at the air outlet end 23, that is, the third groove body 24 is opened on the connecting component 2, and the connecting component 2 is sleeved on the shaft body 1, when the third groove body 24 is also constructed as an annular groove, the maximum size of the third groove body 24 in the circumferential direction of the shaft body 1 can be larger than the maximum size of the first groove body 11.

[0044] The connection assembly 2 includes a bearing seat 25, a flange 26 and an end cover 27. The bearing seat 25 is connected to the end cover 27 through the flange 26. The bearing seat 25 is embedded with a plurality of bearings, and the shaft body 1 is provided with a plurality of bearings so that the shaft body 1 can be rotatably arranged. When the shaft sealing structure is applied to the electric shaft body 1 of the processing equipment, the end cover 27 here can be the end cover 27 on the processing equipment, the bearing seat 25 is fixed in the end cover 27 of the processing equipment through the flange 26, and the shaft body 1 can be fixed in position and can also be rotated through the bearing, thereby ensuring the use of the shaft body 1.

[0045] The air inlet channel 21 may include a first sub-channel 31, a second sub-channel 32 and a third sub-channel 33, wherein the first sub-channel 31 is formed in the bearing seat 25, the second sub-channel 32 is formed in the flange 26, and the third sub-channel 33 is formed in the end cover 27, one end of the first sub-channel 31 is connected to the air source to form an air inlet end 22, the first sub-channel 31 is connected to the second sub-channel 32, the second sub-channel 32 is connected to the third sub-channel 33, and one end of the third sub-channel 33 is connected to the ventilation gap to form an air outlet. In this way, through the first sub-channel 31, the second sub-channel 32 and the third sub-channel 33, the air inlet end 22 of the air inlet channel 21 can be arranged away from the end cover 27. When the main shaft 1 is in use, the part of the main shaft 1 extending out of the end cover 27 will be connected to other structures and processed. The air inlet end 22 of the air inlet channel 21 can be arranged away from the end cover 27, which avoids the air inlet end 22 or the air source interfering with the main shaft 1 or other components when the main shaft 1 is in use. At the same time, the air inlet channel 21 also makes more reasonable use of the space in the connecting pipeline, and no additional pipeline is needed, which saves more costs.

[0046] When processing the first sub-channel 31, the second sub-channel 32 and the third sub-channel 33, due to the limitation of the processing technology, the corresponding sub-channels may have additional holes. In this case, the holes need to be blocked with plugs 34 to prevent air leakage. Figure 1 and Figure 2 For example, in Figure 1 and Figure 2 In the process, it is difficult to process the third sub-channel 33 from the inner circumference of the end cover 27 to the outer circumference. In this case, in order to process the third sub-channel 33, the end cover 27 needs to be penetrated to form the third sub-channel 33. At this time, an additional hole generated by processing will be formed on the outer circumference of the end cover 27. At this time, the additional hole formed by processing in the third sub-channel 33 can be blocked with the plug 24 to prevent air leakage. When processing the first sub-channel 31 and the second sub-channel 32, if additional holes generated by processing appear, they also need to be blocked with the plug 24 to prevent air leakage.

[0047] In some embodiments, the diameter of the first subchannel 3 may be greater than the diameter of the second subchannel 31, and / or the diameter of the second subchannel 31 may be greater than the diameter of the third subchannel 32. The change in the diameter of the subchannel can increase the velocity and pressure of the airflow, that is, increase the strength of the air curtain. When the diameter of the subchannel becomes smaller, the velocity of the airflow will increase, the pressure will increase accordingly, and the strength of the air curtain formed in the ventilation gap will also increase. In this way, the strength of the air curtain can be increased by the subchannel itself. At this time, the velocity and pressure of the airflow provided by the air source can be reduced, reducing the cost of using the air source.

[0048] According to a second aspect of an embodiment of the present application, a processing device is provided, comprising a shaft sealing structure according to any one of the above-mentioned embodiments, and having all the beneficial effects of the above-mentioned shaft sealing structure, which will not be described in detail here.

[0049] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0050] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A shaft sealing structure, characterized in that: The invention comprises a shaft body (1) and a connecting component (2), wherein the connecting component (2) is sleeved on the shaft body (1) for fixing the position of the shaft body (1), the shaft body (1) is rotatably arranged and has a first end extending out of the connecting component (2), a ventilation gap is formed between the outer peripheral surface of the shaft body (1) and the connecting component (2), an air inlet channel (21) having an air inlet end (22) and an air outlet end (23) is formed in the connecting component (2), the air inlet end (22) is communicated with an air source, and the air outlet end (23) is communicated with the ventilation gap, A first blocking structure is provided on the outer peripheral surface of the shaft body (1) and is located corresponding to the air outlet end (23); a second blocking structure is provided on the outer peripheral surface of the shaft body (1) on a side of the first blocking structure away from the first end; the first blocking structure and the second blocking structure are used to intercept and collect impurities entering the ventilation gap.

2. The shaft sealing structure according to claim 1, characterized in that: The first blocking structure is a first groove (11) formed on the outer peripheral surface of the shaft body (1); the outer peripheral surface of the shaft body (1) has a first surface (12) inclined or perpendicular to the axial direction of the shaft body (1); the first surface (12) and the connecting component (2) form the ventilation gap; the second blocking structure is a second groove (13) formed on the first surface (12).

3. The shaft sealing structure according to claim 2, characterized in that: The first groove body (11) is configured as a toothed groove, and the first groove body (11) has a second surface (14) perpendicular to the axial direction of the shaft body (1) and a third surface (15) inclined to the circumferential direction of the shaft body (1), wherein the second surface (14) is in the same plane as the plane where the center line of the air inlet channel (21) is located, and the third surface (15) is located on a side of the second surface (14) close to the first end.

4. The shaft sealing structure according to claim 2, characterized in that: In the first blocking structure, a plurality of first groove bodies (11) are arranged at intervals in the axial direction of the shaft body (1), and the second surface (14) of at least one of the first groove bodies (11) is in the same plane as the plane where the center line of the air inlet channel (21) is located.

5. The shaft sealing structure according to claim 2, characterized in that: A flange (16) is formed on the outer peripheral surface of the shaft body (1), and the first surface (12) is formed on the outer peripheral surface of the flange (16); and / or, The outer peripheral surface of the shaft body (1) is provided with a groove, and the first surface (12) is formed on the inner wall surface of the groove.

6. The shaft sealing structure according to claim 5, characterized in that: The outer peripheral surface of the flange (16) and / or the inner wall surface of the groove further comprises a fourth surface (17) parallel to the axial direction of the shaft body (1), the fourth surface (17) and the connecting component (2) form the ventilation gap, and a third blocking structure is arranged on the fourth surface (17), and the third blocking structure is a fourth groove body (18) opened on the fourth surface (17).

7. The shaft sealing structure according to claim 6, characterized in that: The first groove body (11), the second groove body (13) and the fourth groove body (18) are respectively configured as annular grooves extending along the circumference of the shaft body (1).

8. The shaft sealing structure according to claim 1, characterized in that: A third groove body (24) connected to the air inlet channel (21) is provided at the end of the air outlet end (23); in the circumferential direction of the shaft body (1), the maximum size of the third groove body (24) is greater than the maximum size of the first blocking structure; in the axial direction of the shaft body (1), the maximum size of the third groove body (24) is greater than or equal to the maximum size of the first blocking structure.

9. The shaft sealing structure according to claim 1, characterized in that: The connecting assembly (2) comprises a bearing seat (25), a flange (26) and an end cover (27); the bearing seat (25) is connected to the end cover (27) via the flange (26); a plurality of bearings are embedded in the bearing seat (25); and the shaft body (1) is provided with a plurality of the bearings so that the shaft body (1) can be rotatably arranged.

10. The shaft sealing structure according to claim 9, characterized in that: The air inlet channel (21) comprises a first sub-channel (31), a second sub-channel (32) and a third sub-channel (33), wherein the first sub-channel (31) is formed in the bearing seat (25), the second sub-channel (32) is formed in the flange (26), and the third sub-channel (33) is formed in the end cover (27); one end of the first sub-channel (31) is connected to the air source to form the air inlet end (22); the first sub-channel (31) is connected to the second sub-channel (32), the second sub-channel (32) is connected to the third sub-channel (33), and one end of the third sub-channel (33) is connected to the ventilation gap to form the air outlet end (23).

11. The shaft sealing structure according to claim 10, characterized in that: The diameter of the first sub-channel (31) is greater than the diameter of the second sub-channel (32), and / or the diameter of the second sub-channel (32) is greater than the diameter of the third sub-channel (33).

12. A processing equipment, characterized in that: The invention comprises the shaft sealing structure as described in any one of claims 1 to 11.

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