Air-tight sealing structure of electric spindle and electric spindle

Abstract

The invention provides a motorized spindle air-tight sealing structure and a motorized spindle. The motorized spindle air-tight sealing structure comprises a front-end flange, a second channel arranged on the front-end flange, an air-tight sealing ring arranged on the front-end flange, a plurality of fifth channels and a plurality of sixth channels arranged on the air-tight sealing ring, and a front-end cover arranged on the front-end flange, a first gap is formed between the front end cover and the gas sealing ring, the gas sealing ring is arranged on a front end nut of the electric spindle in a sleeving mode, a third channel is formed by the gas sealing ring and the front end flange, one end of the second channel is communicated with the first channel, and the other end of the second channel is communicated with the third channel. A part of gas flows to a threaded groove of the front end nut through a sixth channel, and the rest gas flows to the first gap through a fifth channel. According to the sealing structure, the technical problem that in the prior art, a spindle front end air sealing structure is a single circumferential air curtain, and the sealing effect is poor can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of electric spindles, and in particular relates to an electric spindle air sealing structure and an electric spindle. Background Art

[0002] The electric spindle is a new technology in the field of CNC machine tools that combines a drive motor and a rotating spindle. With the continuous development of science and technology, the performance requirements for electric spindles are getting higher and higher. High-precision, high-speed, high-rigidity, and high-torque electric spindles have emerged, especially the electric spindles for machining centers. Most electric spindles for machining centers use precision and ultra-high-precision rolling bearings. In order to protect the bearings from water, oil, and chip contaminants during processing, the spindle must use a sealing structure to prevent contaminants from entering the bearings and corroding the bearings, thereby reducing the service life of the spindle.

[0003] Most of the existing spindle air sealing structures only seal the front end of the spindle, and often ignore the sealing of the rear bearing of the spindle. During the long-term use of the spindle of the machining center, water leakage is very likely to occur, flowing directly from the tail into the spindle, and then into the rear bearing of the spindle, affecting the life of the spindle. Therefore, the air seal at the rear end of the spindle is also particularly important. In addition, most of the existing spindle front end air sealing structures use an air seal ring to generate a single circumferential air curtain. By opening a limited number of evenly distributed radial air holes around the air seal ring, the sealing air enters the sealing gap from the air holes. The ability of a single air curtain to prevent pollutants from entering the bearing is limited, and it still affects the life of the spindle over time.

[0004] Since the air sealing structure at the front end of the spindle in the prior art is a single circumferential air curtain, there are technical problems such as poor sealing effect. Therefore, the present invention studies and designs an electric spindle air sealing structure and an electric spindle. Summary of the invention

[0005] Therefore, the present invention provides an electric spindle air sealing structure and an electric spindle, which can solve the technical problem in the prior art that the air sealing structure at the front end of the spindle is a single circumferential air curtain and has a poor sealing effect.

[0006] In order to solve the above problems, the present invention provides an electric spindle air sealing structure, including: a front end flange, a second channel is provided on the front end flange, a gas sealing ring is provided on the front end flange, a plurality of fifth channels and a plurality of sixth channels are provided on the gas sealing ring, the fifth channel is arranged along the axial direction of the gas sealing ring, and the sixth channel is arranged along the radial direction of the gas sealing ring, a front end cover is provided on the front end flange, a first gap is formed between the front end cover and the gas sealing ring, the gas sealing ring is sleeved on the front end nut of the electric spindle, the gas sealing ring and the front end flange form a third channel, one end of the second channel is connected to the first channel, and the other end of the second channel is connected to the third channel, after the gas flows through the second channel and the third channel in sequence, a part of the gas flows to the thread groove of the front end nut through the sixth channel, and the remaining gas flows to the first gap through the fifth channel.

[0007] In some embodiments, a plurality of seventh channels are provided on the front end cover, the seventh channels are provided along the front end cover, and the seventh channels penetrate the front end cover, one end of the seventh channel is connected to the fifth channel, the other end of the seventh channel is opened on the front end cover away from the air sealing ring, and a plug is provided in the seventh channel.

[0008] In some embodiments, the electric spindle air sealing structure also includes a rear end pipeline disk and a shaft sleeve. Along the axial direction of the electric spindle, the rear end pipeline disk, the shaft sleeve and the front end flange are arranged in sequence. A first channel is provided on the rear end pipeline disk. One end of the first channel is opened on the rear end pipeline disk, and the other end of the first channel passes through the rear end pipeline disk and the shaft sleeve in sequence and is located in the front end flange and is connected to the second channel.

[0009] In some embodiments, an eighth channel and a ninth channel are provided on the rear end pipeline disk, the eighth channel is annular, the ninth channel is arranged along the axial direction of the rear end pipeline disk, and one end of the ninth channel is opened at the end of the rear end pipeline disk facing away from the shaft sleeve, one side of the eighth channel is connected to the first channel, and the other side of the eighth channel is connected to the ninth channel.

[0010] In some embodiments, the ninth channel is arranged closer to the rotation axis of the electric spindle relative to the first channel.

[0011] In some embodiments, a rear end nut is sleeved in the rear end pipeline disc, and a second gap is defined between the rear end nut and the rear end pipeline disc. A fourth channel is defined on the rear end pipeline disc, and one end of the fourth channel is opened on the outer wall of the rear end pipeline disc, and the other end of the fourth channel is connected to the second gap, and at least part of the gas flowing out of the ninth channel flows out from the fourth channel after passing through the second gap.

[0012] In some embodiments, the ninth channel is annular, the ninth channel extends in the axial direction of the rear end pipeline disk, and the eighth channel extends in the radial direction of the rear end pipeline disk.

[0013] In some embodiments, there are a plurality of the ninth channels, and the plurality of the ninth channels are arranged at intervals along the circumference of the rear end pipeline disk, and the ninth channel extends along the axial direction of the rear end pipeline disk.

[0014] In some embodiments, along the circumference of the air-sealing ring, a plurality of the fifth channels are arranged at intervals, and a plurality of the sixth channels are arranged at intervals, and the air-sealing ring has a first part and a second part, the first part is arranged on the second part, and the outer diameter of the second part is larger than the outer diameter of the first part, along the axial direction of the second part, the fifth channel is arranged on the second part, and along the radial direction of the first part, the sixth channel is arranged on the end surface of the second part facing away from the first part, and the third channel is formed between the outer peripheral wall of the first part, the second part and the front end flange.

[0015] The present invention also provides an electric spindle, which comprises the above-mentioned electric spindle air sealing structure.

[0016] The electric spindle air sealing structure and the electric spindle provided by the present invention have the following beneficial effects:

[0017] After the gas enters from the second channel, a part of the gas flows to the thread groove of the front nut through the sixth channel to form the first air curtain, and the remaining gas flows to the first gap through the fifth channel to form the second air curtain, forming a double air curtain structure at the front end of the electric spindle, which can effectively prevent pollutants from entering the front bearing and affecting the life of the spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0019] Figure 1 It is a structural schematic diagram of the electric spindle air sealing structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the air sealing ring in the electric spindle air sealing structure of the present invention;

[0021] Figure 3 It is a structural schematic diagram of a pipeline disk in the electric spindle air sealing structure of the present invention;

[0022] Figure 4 yes Figure 1 The enlarged view of point Ⅰ in the middle;

[0023] Figure 5 yes Figure 1 The enlarged view of the middle II;

[0024] Figure 6 yes Figure 1 A is the enlarged view of point A in the middle;

[0025] Figure 7 yes Figure 1 A is the enlarged view of the middle IV;

[0026] Figure 8 yes Figure 1 A is the enlarged view of point B in the middle;

[0027] Fig. 9 It is an assembly structure diagram of the front end gap deflection in the electric spindle air sealing structure of the present invention;

[0028] Fig.10 It is an assembly structure diagram of the rear end gap deflection in the electric spindle air sealing structure of the present invention.

[0029] The accompanying drawings are marked as follows:

[0030] 1. Bushing; 2. Front end nut; 3. Front end spacer; 4. Front bearing; 5. Front end flange; 6. Plug; 7. Rear end pipe plate; 8. Second channel; 9. Gas sealing ring; 10. Pressure cover; 11. Pull rod anti-rotation ring; 12. Fixed seat; 13. Front end cover; 14. Rear end nut; 15. Rear end flange; 16. Rear spacer; 17. First channel; 18. Third channel; 19. Fifth channel; 20. Threaded groove; 21. Sixth channel; 22. Seventh channel; 23. Eighth channel; 24. Ninth channel; 25. Fourth channel. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0033] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0034] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0035] See also Figure 1-10As shown, according to an embodiment of the present invention, there is provided an electric spindle gas sealing structure, comprising: a front end flange 5, a second channel 8 is arranged on the front end flange 5, a gas sealing ring 9 is arranged on the front end flange 5, a plurality of fifth channels 19 and a plurality of sixth channels 21 are arranged on the gas sealing ring 9, the fifth channel 19 is arranged along the axial direction of the gas sealing ring 9, and the sixth channel 21 is arranged along the radial direction of the gas sealing ring 9, a front end cover 13 is arranged on the front end flange 5, a first gap is formed between the front end cover 13 and the gas sealing ring 9, the gas sealing ring 9 is sleeved on the front end nut 2 of the electric spindle, the gas sealing ring 9 and the front end flange 5 form a third channel 18, one end of the second channel 8 is connected to the first channel 17, and the other end of the second channel 8 is connected to the third channel 18, after the gas flows through the second channel 8 and the third channel 18 in sequence, a part of the gas flows to the thread groove 20 of the front end nut 2 through the sixth channel 21, and the remaining gas flows to the first gap through the fifth channel 19. In this technical solution, after the gas enters from the second channel 8, a part of the gas flows to the thread groove 20 of the front nut 2 through the sixth channel 21 to form the first air curtain, and the remaining gas flows to the first gap through the fifth channel 19. The second air curtain is formed, and a double air curtain structure is formed at the front end of the electric spindle, which can effectively prevent pollutants from entering the front bearing and affecting the life of the spindle.

[0036] The related technology provides an air sealing structure that uses an air sealing ring to form a circumferential air curtain. The air holes are not distributed radially symmetrically, but are distributed rotationally symmetrically along a certain oblique angle. In this solution, the diameter of the air holes is very small, and multiple clamping is required, which has high processing costs.

[0037] The related technology also provides a structure that eliminates the air sealing ring and realizes the circumferential air curtain at the front end of the main shaft through the cooperation between adjacent parts. However, this solution only designs an air curtain to prevent contaminants from entering the bearing. At the same time, the added contaminant discharge holes have a great impact on the air curtain. Gas will mostly flow out from the leakage holes, thereby increasing the risk of contaminants entering the front bearing.

[0038] In some embodiments, the front cover 13 is provided with a plurality of seventh channels 22, the seventh channels 22 are provided along the front cover 13, and the seventh channels 22 penetrate the front cover 13, one end of the seventh channel 22 is connected with the fifth channel 19, the other end of the seventh channel 22 is opened in the front cover 13 facing away from the air seal ring 9, and a plug 6 is provided in the seventh channel 22. In this technical solution, a pollutant storage cavity is formed at the front cover 13, the front nut 18 and the front air seal ring 9, through the seventh channel 22, when the electric spindle is operating normally, the seventh channel 22 is blocked, and the seventh channel 22 is opened through the plug 6 when the electric spindle is maintained, and the pollutants are discharged out of the electric spindle under the action of the airflow in the fifth channel 19, which is convenient for the maintenance of the electric spindle.

[0039] In some embodiments, the electric spindle air-sealing structure further includes a rear-end pipeline disc 7 and a sleeve 1. Along the axial direction of the electric spindle, the rear-end pipeline disc 7, the sleeve 1 and the front-end flange 5 are arranged in sequence. The rear-end pipeline disc 7 is provided with a first channel 17. One end of the first channel 17 is opened on the rear-end pipeline disc 7. The other end of the first channel 17 passes through the rear-end pipeline disc 7 and the sleeve 1 in sequence and is located in the front-end flange 5, and is connected to the second channel 8. In this technical solution, the air-sealing gas is transported to the inside of the electric spindle through the first channel 17. Furthermore, the electric spindle structure further includes a front-end spacer ring 3. In combination with the reference Fig. 9 As shown, a first groove is provided on the front end spacer ring 3, a second groove is provided on the front end cover 13, a first protrusion and a second protrusion are provided on the front end flange 5, and a third gap exists between the front end flange 5 and the front end cover 13. When the contaminants enter the electric spindle through the third gap between the front end flange 5 and the front end cover 13, they will undergo 9 levels of 90° gap deflection, thereby increasing the difficulty for the contaminants to enter the front bearing, thereby ensuring that the front bearing 4 of the electric spindle is not contaminated.

[0040] The electric spindle air sealing structure of the present invention is designed with a pollutant storage cavity at the front end cover 13, the front end nut 2 and the front end air sealing ring 9. At the same time, four seventh channels 22 are opened in the front end cover 13. When the spindle is operating normally, the seventh channels 22 are blocked. When the spindle is maintained, the seventh channels 22 are opened to discharge the pollutants.

[0041] In the electric spindle air seal structure of the present invention, the gas enters the axial third channel 18 of the front end air seal ring through the axial flow channel of the sleeve 1 and the radial flow channel of the front end flange, that is, forming a first annular cavity, which allows the gas to evenly pass through the 20 axial holes and 4 radial holes opened by the front end air seal ring 9. The gas is blown out from the 20 axial holes to form the first air curtain in the air gap flow channel between the front end air seal ring 9 and the front end cover 13, and the gas is blown out from the 4 radial holes to form the second air curtain at the circumferential triangular thread groove 20 of the front end nut, which can effectively prevent pollutants from entering the front bearing and affecting the life of the spindle. By designing the mechanical structure of the front end flange 5, the front end cover 13, the front end nut 2, and the front end spacer ring 3, a 9-level 90° gap deflection is formed, which increases the difficulty of pollutants entering the front bearing and ensures that the front bearing of the spindle is not contaminated.

[0042] In some embodiments, the rear end pipeline disk 7 is provided with an eighth channel 23 and a ninth channel 24, the eighth channel 23 is annular, the ninth channel 24 is arranged along the axial direction of the rear end pipeline disk 7, and one end of the ninth channel 24 is opened at the end of the rear end pipeline disk 7 facing away from the shaft sleeve 1, one side of the eighth channel 23 is connected to the first channel 17, and the other side of the eighth channel 23 is connected to the ninth channel 24. In this technical solution, through the eighth channel 23 and the ninth channel 24, while the front end of the electric spindle is air-sealed, an air-sealing structure of the rear end of the electric spindle can also be formed at the outlet of the ninth channel 24, taking into account the air-sealing performance of the front and rear ends of the electric spindle.

[0043] In some embodiments, the ninth channel 24 is arranged close to the rotating shaft of the electric spindle relative to the first channel 17. In this technical solution, the ninth channel 24 is arranged close to the rotating shaft of the electric spindle relative to the first channel 17, that is, the ninth channel 24 and the first channel 17 are arranged at intervals in the radial direction of the rear end pipeline disk 7, which ensures the normal air intake of the first channel 17 and the air sealing effect of the ninth channel 24 on the spindle.

[0044] In some embodiments, a rear nut 14 is sleeved inside the rear pipe disc 7, a second gap is formed between the rear nut 14 and the rear pipe disc 7, a fourth channel 25 is provided on the rear pipe disc 7, one end of the fourth channel 25 is opened on the outer wall of the rear pipe disc 7, the other end of the fourth channel 25 is connected to the second gap, and the gas flowing out of the ninth channel 24 at least partially passes through the second gap and then flows out from the fourth channel 25. In this technical solution, the gas after air sealing is discharged from the electric spindle through the fourth channel 25, forming a gas cycle.

[0045] The electric spindle gas sealing structure of the present invention comprises a shaft sleeve 1, a front flange 5, a rear pipeline disc 7, a rear gas sealing gland 10, a floating knife oil cylinder fixing seat 12 and a rear flange 15; the spindle rotating part comprises a front cover 13, a front nut 2, a front spacer 3, a front bearing 4, a tie rod anti-rotation ring 11, a rear locking nut 14 and a rear spacer 16 of the rear bearing. The front flange 5 and the rear pipeline disc 7 of the spindle are respectively provided with gas sealing inlet flow passages for the front bearing position and the rear bearing position of the spindle. The gas enters from the rear pipeline disc 7 and is divided into channels in the axial flow passage 7 of the rear pipeline disc. One channel passes through the radial eighth channel 23 of the rear pipeline disc to perform gas sealing on the rear bearing; the other channel continues to move forward through the axial flow passage of the shaft sleeve 1 to perform gas sealing on the front bearing.

[0046] In some embodiments, the ninth channel 24 is annular, the ninth channel 24 extends along the axial direction of the rear end pipeline disk 7, and the eighth channel 23 extends along the radial direction of the rear end pipeline disk 7. In this technical solution, the ninth channel 24 is annular, the ninth channel 24 extends along the axial direction of the rear end pipeline disk 7, and the eighth channel 23 extends along the radial direction of the rear end pipeline disk 7. In this way, the areas of the eighth channel 23 and the ninth channel 24 are maximized, ensuring the airtightness of the ninth channel 24.

[0047] The gas enters the rear end air seal axial flow channel through the eighth radial channel 23 of the rear end pipeline disk, forming an annular cavity circumferential flow channel, which allows the gas to evenly flow out from the 18 axial cylindrical air holes of the rear end pipeline disk, that is, the ninth channel 24, forming an air curtain in the air gap flow channel between the rear end pipeline disk 7 and the pull rod anti-rotation ring 11, effectively preventing pollutants from entering the rear bearing.

[0048] The electric spindle air seal structure of the present invention has a double-layer air curtain and 9-level 90° gap deflection designed at the front end, which significantly increases the resistance to the entry of pollutants. At the same time, a pollutant storage cavity and a drainage hole are designed. The drainage hole is blocked when the spindle is operating normally, and the drainage hole is opened during spindle maintenance to discharge the pollutants. Taking into account the anti-pollution of the rear bearing of the spindle, an air curtain and a rear-end labyrinth seal structure are added to solve the problem of pollutants entering the rear bearing of the spindle. At the same time, a drainage hole is added at the tail of the spindle to effectively discharge the pollutants entering the tail of the spindle out of the spindle.

[0049] In some embodiments, the ninth channel 24 has a plurality of channels, and the plurality of channels 24 are arranged at intervals along the circumference of the rear end pipeline disk 7, and the ninth channel 24 extends along the axial direction of the rear end pipeline disk 7. Figure 3As shown, the ninth channel 24 has a plurality of channels, and the plurality of channels 24 are arranged at intervals along the circumference of the rear end pipeline disk 7, and the ninth channel 24 extends along the axial direction of the rear end pipeline disk 7. In this way, the airtightness of the ninth channel 24 is ensured, and the mechanical strength of the rear end pipeline disk 7 is also ensured.

[0050] See also Fig.10 As shown, through the pull rod anti-rotation ring 11, the rear end locking nut 14, the rear end pipeline plate 7, the rear end flange 15 and the rear bearing rear spacer ring 16 structure, a 7-level 90° gap deflection is formed to effectively prevent pollutants from entering the rear bearing and affecting the life of the spindle. If pollutants enter the spindle, the designed rear end air sealing structure can blow them out from the two rear end fourth channels 25 opened on the rear end pipeline plate 7, effectively improving the life of the spindle.

[0051] In some embodiments, along the circumference of the gas sealing ring 9, a plurality of the fifth channels 19 are arranged at intervals, a plurality of the sixth channels 21 are arranged at intervals, and the gas sealing ring 9 has a first part and a second part, the first part is arranged on the second part, and the outer diameter of the second part is greater than the outer diameter of the first part, along the axial direction of the second part, the fifth channel 19 is arranged on the second part, and along the radial direction of the first part, the sixth channel 21 is arranged on the end surface of the second part facing away from the first part, and the third channel 18 is formed between the outer peripheral wall of the first part, the second part and the front end flange 5. In this technical solution, in combination with reference to Figure 2 As shown, through the stepped structure of the gas sealing ring 9, the gas in the third channel 18 can move in the radial direction and axial direction of the gas sealing ring 9 respectively, thereby forming two gas curtains to improve the gas sealing effect of the electric spindle.

[0052] The electric spindle air sealing structure of the present invention is designed with a double-layer air curtain added at the front end, which effectively solves the problem of anti-pollution of the front end of the spindle; it also takes into account the anti-pollution of the rear bearing of the spindle, and solves the problem of contaminants at the rear end of the spindle entering the rear bearing.

[0053] The present invention also provides an electric spindle, comprising the electric spindle air sealing structure.

[0054] The electric spindle of the present invention comprises a sleeve 1, a front end nut 2, a front end spacer ring 3, a front bearing 4, a front end flange 5, a rear end pipeline disk 7, a second channel 8, an air sealing ring 9, a pressure cover 10, a pull rod anti-rotation ring 11, a fixing seat 12, a front end cover 13, a rear end nut 14, a rear end flange 15, and a rear bearing rear spacer ring 16. The connection structure of the electric spindle is basically the same as the connection structure of the existing electric spindle. The present invention improves the air sealing structure of the electric spindle to form two air curtains at the front end of the electric spindle, and also takes into account the air sealing structure at the rear end of the electric spindle, thereby improving the air sealing performance of the electric spindle.

[0055] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An electric spindle air sealing structure, characterized in that: include: A front end flange (5), wherein a second channel (8) is arranged on the front end flange (5), a gas sealing ring (9) is arranged on the front end flange (5), a plurality of fifth channels (19) and a plurality of sixth channels (21) are arranged on the gas sealing ring (9), the fifth channels (19) are arranged along the axial direction of the gas sealing ring (9), the sixth channels (21) are arranged along the radial direction of the gas sealing ring (9), a front end cover (13) is arranged on the front end flange (5), a first gap is formed between the front end cover (13) and the gas sealing ring (9), and the gas sealing ring ( 9) is sleeved on the front end nut (2) of the electric spindle, the air sealing ring (9) and the front end flange (5) form a third channel (18), one end of the second channel (8) is connected to the first channel (17), and the other end of the second channel (8) is connected to the third channel (18), after the gas flows through the second channel (8) and the third channel (18) in sequence, a part of the gas flows to the thread groove (20) of the front end nut (2) through the sixth channel (21), and the remaining gas flows to the first gap through the fifth channel (19).

2. The electric spindle air sealing structure according to claim 1, characterized in that: A plurality of seventh channels (22) are provided on the front end cover (13), the seventh channels (22) are provided along the front end cover (13), and the seventh channels (22) penetrate the front end cover (13), one end of the seventh channel (22) is connected to the fifth channel (19), the other end of the seventh channel (22) is opened on the front end cover (13) away from the air sealing ring (9), and a plug (6) is provided in the seventh channel (22).

3. The electric spindle air sealing structure according to claim 1, characterized in that: The electric spindle air sealing structure also includes a rear end pipeline disc (7) and a shaft sleeve (1). Along the axial direction of the electric spindle, the rear end pipeline disc (7), the shaft sleeve (1) and the front end flange (5) are arranged in sequence. The rear end pipeline disc (7) is provided with a first channel (17). One end of the first channel (17) is opened on the rear end pipeline disc (7). The other end of the first channel (17) passes through the rear end pipeline disc (7) and the shaft sleeve (1) in sequence and is located in the front end flange (5) and is connected to the second channel (8).

4. The electric spindle air sealing structure according to claim 1, characterized in that: An eighth channel (23) and a ninth channel (24) are provided on the rear end pipeline disc (7); the eighth channel (23) is annular, the ninth channel (24) is arranged along the axial direction of the rear end pipeline disc (7), and one end of the ninth channel (24) is opened at an end of the rear end pipeline disc (7) facing away from the shaft sleeve (1); one side of the eighth channel (23) is connected to the first channel (17), and the other side of the eighth channel (23) is connected to the ninth channel (24).

5. The electric spindle air sealing structure according to claim 4, characterized in that: The ninth channel (24) is arranged relative to the first channel (17) and close to the rotation axis of the electric spindle.

6. The electric spindle air sealing structure according to claim 4, characterized in that: A rear nut (14) is sleeved in the rear pipeline disc (7), a second gap is defined between the rear nut (14) and the rear pipeline disc (7), a fourth channel (25) is provided on the rear pipeline disc (7), one end of the fourth channel (25) is opened on the outer wall of the rear pipeline disc (7), the other end of the fourth channel (25) is connected to the second gap, and at least part of the gas flowing out of the ninth channel (24) flows out from the fourth channel (25) after passing through the second gap.

7. The electric spindle air sealing structure according to claim 4, characterized in that: The ninth channel (24) is annular in shape, and extends along the axial direction of the rear end pipeline disc (7), and the eighth channel (23) extends along the radial direction of the rear end pipeline disc (7).

8. The electric spindle air sealing structure according to claim 4, characterized in that: There are a plurality of the ninth channels (24), which are arranged at intervals along the circumference of the rear end pipeline disc (7), and the ninth channels (24) extend along the axial direction of the rear end pipeline disc (7).

9. The electric spindle air sealing structure according to claim 1, characterized in that: Along the circumference of the gas sealing ring (9), a plurality of the fifth channels (19) are arranged at intervals, and a plurality of the sixth channels (21) are arranged at intervals, and the gas sealing ring (9) has a first part and a second part, the first part is arranged on the second part, and the outer diameter of the second part is greater than the outer diameter of the first part, along the axial direction of the second part, the fifth channel (19) is arranged on the second part, and along the radial direction of the first part, the sixth channel (21) is arranged on the end surface of the second part facing away from the first part, and the third channel (18) is formed between the outer peripheral wall of the first part, the second part and the front end flange (5).

10. An electric spindle, characterized in that: The invention comprises the electric spindle air sealing structure as claimed in any one of claims 1 to 9.

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