阅读说明：本技术 主轴结构 (Main shaft structure ) 是由 张信平 黄国钦 于 2018-07-03 设计创作，主要内容包括：本发明公开了一种主轴结构,其包括：一第一本体设有第一容槽及第一入气孔；一第二本体固设于该第一本体一端,该第二本体设有第二容槽、第三容槽、第一抵面、第二入气孔及第四容槽；一分配环容设于该第三容槽处,该分配环对正该第二入气孔,该分配环设有第一环槽、第二环槽及复数穿槽,每一穿槽使该第一环槽及该第二环槽呈相通状；一转动轴枢设于该第一容槽、该第二容槽及该分配环处,该转动轴一端设有第三周面及第四周面,该第四周面与该分配环的该第二环槽相对正,该分配环与该转动轴的该第四周面间具有一间隙,该第四周面呈斜面状；该气流依序由该第一入气孔、该第二入气孔、该第一环槽、该复数穿槽及该第二环槽而布设进入该第四周面处；该第四周面与该分配环之内周面之间具有第一间隙及第二间隙,该第一间隙大于该第二间隙。(The invention discloses a main shaft structure, which comprises: a first body is provided with a first containing groove and a first air inlet; the second body is fixedly arranged at one end of the first body and is provided with a second containing groove, a third containing groove, a first abutting surface, a second air inlet and a fourth containing groove; a distribution ring is accommodated in the third accommodating groove and aligned with the second air inlet hole, the distribution ring is provided with a first ring groove, a second ring groove and a plurality of through grooves, and each through groove enables the first ring groove and the second ring groove to be communicated; a rotating shaft is pivoted to the first containing groove, the second containing groove and the distributing ring, one end of the rotating shaft is provided with a third circumferential surface and a fourth circumferential surface, the fourth circumferential surface is aligned with the second ring groove of the distributing ring, a gap is formed between the distributing ring and the fourth circumferential surface of the rotating shaft, and the fourth circumferential surface is in an inclined plane shape; the air flow is sequentially distributed from the first air inlet, the second air inlet, the first annular groove, the plurality of through grooves and the second annular groove to enter the fourth circumferential surface; a first gap and a second gap are formed between the fourth peripheral surface and the inner peripheral surface of the distribution ring, and the first gap is larger than the second gap.)

1. A spindle structure characterized in that: it includes:

the first body is arranged on the machine tool and provided with a first containing groove, the first body is provided with a first air inlet hole, and the first air inlet hole is connected with an air flow source;

the second body is fixedly arranged at one end of the first body and is provided with a second containing groove, the second containing groove is aligned with the first containing groove, the second containing groove is in a circular through hole shape, one end of the second containing groove is provided with a third containing groove, the third containing groove is communicated with the second containing groove, the third containing groove is in a circular ring groove shape, the diameter of the third containing groove is larger than that of the second containing groove, so that a first abutting surface is arranged at the bottom of the third containing groove, the first abutting surface is arranged between the second containing groove and the third containing groove, the second body is provided with a second air inlet hole, the second air inlet hole is aligned with and communicated with the first air inlet hole, and the second air inlet hole is communicated with the third containing groove;

the distribution ring is accommodated in the third accommodating groove of the second body and aligned with the second air inlet hole, a first ring groove is formed in the outer peripheral surface of the distribution ring, the first ring groove and the second air inlet hole are opposite to each other, the first ring groove is in a concave ring groove shape, a second ring groove is formed in the inner peripheral surface of the distribution ring, the second ring groove is in a concave ring groove shape, a plurality of penetrating grooves are formed in the distribution ring, and each penetrating groove penetrates through the distribution ring, namely each penetrating groove enables the first ring groove and the second ring groove to be communicated;

a rotating shaft, which penetrates through the first containing groove of the first body, the second containing groove of the second body and the distribution ring, and rotates in the first containing groove and the second containing groove, one end of the rotating shaft is provided with a fourth peripheral surface, the fourth peripheral surface is aligned with the inner peripheral surface of the distribution ring and the second annular groove, a gap is formed between the distribution ring and the fourth peripheral surface of the rotating shaft, and the fourth peripheral surface is in an inclined plane shape, i.e. the outer diameter of the fourth peripheral surface is the smallest as the fourth peripheral surface goes outside;

the air flow is sequentially distributed from the first air inlet, the second air inlet, the first annular groove, the plurality of through grooves and the second annular groove to enter the fourth circumferential surface of the rotating shaft;

a front cover fixedly arranged at the end part of the second body, wherein one end of the rotating shaft is convexly extended and pivoted on the front cover, namely the rotating shaft sequentially penetrates through the front cover, the distribution ring, the second containing groove and the first containing groove;

a first gap and a second gap are arranged between the fourth circumferential surface and the inner circumferential surface of the distribution ring, and the first gap is larger than the second gap.

2. The spindle structure according to claim 1, wherein: the first containing groove is in a perforation shape, the first containing groove is in a penetrating shape, the first air inlet hole is arranged on one side of the first containing groove, the first air inlet hole is in a perforation shape, the section of the second air inlet hole is in a round hole shape, the second air inlet hole is in an L-shaped path shape, the second body is provided with a first screw hole, the first screw hole is communicated with the second air inlet hole, the end part of the first screw hole is in an internal thread shape, a first screwing piece is arranged, the first screwing piece is combined with the end part of the first screw hole of the second body, the first screw hole is in a closed shape, and the first screwing piece is in an external thread shape.

3. The spindle structure according to claim 1, wherein: the end face of the distribution ring abuts against the first abutting face, the distribution ring is in a circular ring shape, the distribution ring can be elastic or inelastic, a gap or no gap can be formed between the outer peripheral face of the distribution ring and the inner peripheral face of the third containing groove, the section of the distribution ring is in an H shape, the second ring groove and the first ring groove are symmetrical relative to the distribution ring, the through grooves are circular through holes, the through grooves are arranged in an annular shape, and all the through grooves are not aligned with the second air inlet holes or one through groove thereof is aligned with the second air inlet holes.

4. The spindle structure according to claim 1, wherein: a fourth accommodating groove is arranged at the other end of the second accommodating groove, the fourth accommodating groove is communicated with the second accommodating groove, the fourth accommodating groove is in a circular groove shape, the diameter of the fourth accommodating groove is larger than that of the second accommodating groove, so that a second abutting surface is arranged at the bottom of the fourth accommodating groove, and the second abutting surface is arranged between the second accommodating groove and the fourth accommodating groove; one end of the rotating shaft is provided with a third circumferential surface; the first elastic oil seal is arranged at the fourth containing groove of the second body, the end part of the first elastic oil seal abuts against the second abutting surface, the first elastic oil seal has outward-extending elasticity, a gap is not formed between the first elastic oil seal and the fourth containing groove of the second body, and the rotating shaft penetrates through the first containing groove of the first body, the second containing groove of the second body, the distribution ring and the first elastic oil seal.

5. The spindle structure according to claim 4, wherein: the first elastic oil seal comprises a first ring body, a second ring body, a third ring body, a fourth ring body and a retaining ring; the first ring body is in a circular ring shape, the outer peripheral surface of the first ring body is provided with a first peripheral surface, the first peripheral surface is the outer peripheral surface of the first elastic oil seal, the first peripheral surface is abutted against the inner peripheral surface of the fourth containing groove, and no gap exists between the first peripheral surface and the fourth containing groove; the second ring body is in a circular ring shape and is accommodated in the first ring body; the third ring body is in a circular ring shape, the third ring body is accommodated in the first ring body, the second ring body is arranged between the first ring body and the third ring body, the first ring body, the second ring body and the third ring body are slightly assembled into a C shape, the inner circumferential surface of the third ring body is provided with a second circumferential surface, the second circumferential surface is the inner circumferential surface of the first elastic oil seal, the section of the third ring body is slightly in a V shape, and the second circumferential surface is in a minimum area shape; the fourth ring body is in a circular ring shape and is accommodated in the first ring body, the second ring body and the third ring body, so that the first ring body, the second ring body and the third ring body are assembled, and the first ring body and the third ring body have outward-extending elasticity; the retaining ring is in a circular ring shape and is buckled on the peripheral surface of the third ring body, the third peripheral surface is abutted against the second peripheral surface of the first elastic oil seal, and the second peripheral surface is elastically pressed against the third peripheral surface.

6. The spindle structure according to claim 1, wherein: one end of the fourth circumferential surface abuts against the first abutting surface of the second body, the rotating shaft is provided with a fifth circumferential surface, and the diameter of the fifth circumferential surface is smaller than that of the fourth circumferential surface so that a third abutting surface is arranged; the front cover limits the third abutting surface, so that the rotating shaft is not separated from the front cover, and an L-shaped airflow channel is formed between the front cover and the fifth circumferential surface of the rotating shaft as well as between the front cover and the third abutting surface.

7. The spindle structure according to claim 1, wherein: and a second elastic oil seal is arranged in the first body and aligned with the other end of the rotating shaft.

8. The spindle structure according to claim 1, wherein: the power mechanism is arranged at the other end part of the first body, the power mechanism is exposed out of the first body, the power mechanism is sleeved with the rotating shaft, and when the power mechanism is driven, the power mechanism drives the rotating shaft to rotate.

9. The spindle structure according to claim 4, wherein: wherein the first elastic oil seal can be replaced by a set of common labyrinth rings.

10. The spindle structure according to claim 2, wherein: the second body is provided with a second screw hole which is communicated with the third containing groove of the second body, the second screw hole is symmetrical to the first screw hole, the end part of the second screw hole is in an internal thread shape, the first ring groove of the distribution ring is in a relative positive shape with the first screw hole and the second screw hole, a second screw part is arranged, the second screw part is combined with the end part of the second screw hole, the second screw part is provided with a through hole, the third containing groove is communicated with the outside through the through hole, and partial air flow can be discharged out of the main shaft structure through the through hole.

Technical Field

The present invention relates to a spindle structure.

Background

The existing spindle structure, such as taiwan patent application no: 101203021, certificate number: m436524, patent name: but waterproof dirt-proof processing machine main shaft, this patent structure lies in: a waterproof and dustproof processor spindle, comprising: a sleeve 20, which has a hollow tube structure and an end portion 22 at one end, the end portion 22 has a peripheral surface 221 and an end surface 222, the end portion 22 is provided with a gas input channel 23 passing through the end surface 222 from the peripheral surface 221; a plurality of bearings 30 disposed in the sleeve 20; a shaft member 40 penetrating each of the bearings 30 and being pivotable with respect to the sleeve 20; an end cover 50 having a through hole 51, a ring groove 53 formed on one side of the end cover 50 along the periphery of the through hole 51, a gas flow channel 54 penetrating the ring groove 53 is formed on one side of the end cover 50 different from the ring groove 53, the shaft 40 is sleeved on the end cover 50 through the through hole 51, and the end cover 50 is locked and fixed on the end edge surface 222 of the sleeve 20, and the gas flow channel 54 is communicated with the gas input channel 23 of the sleeve 20; an air flow distribution retaining ring 60 accommodated in the annular groove 53 of the end cap 50, and a cyclone groove 61 is further disposed on the circumferential surface of the air flow distribution retaining ring 60 corresponding to the position of the air flow channel 54; and a gas flow source 70 disposed in communication with the gas flow passage 54 of the end cap 50.

The disadvantages of this prior art structure are, however:

1. as shown in the fourth drawing of the gazette, the gas flow distribution stop ring 60 is accommodated in the annular groove 53, and although a cyclone groove 61 is disposed at a position corresponding to the gas flow channel 54 on the outer periphery of the gas flow distribution stop ring 60, the space of the cyclone groove 61 is relatively small, the gas flow is difficult to be uniformly distributed on the outer periphery of the gas flow distribution stop ring 60, so that the gas flow at the position where the outer periphery of the gas flow distribution stop ring 60 is close to the gas flow channel 54 is relatively large, and the gas flow at the position where the gas flow is farther away from the gas flow channel 54 is relatively small.

2. The airflow distribution stop ring 60 should be tightly fitted on the outer peripheral surface of the shaft 40, so that the airflow distribution stop ring 60 needs to be externally disposed on the outer peripheral surface of the shaft 40, thereby increasing the difficulty of assembly.

Another taiwan patent application No.: 103209154, certificate number: m489044, patent name: the main shaft of machine tool with air power type water retaining device, as shown in the fifth drawing of the gazette, has the same disadvantage as the above-mentioned point 1, because the flow gap 151 is small and the air flow cannot be uniformly distributed.

In view of the above-mentioned shortcomings of the prior art, the present inventors have made many years of experience in manufacturing, production and design in the related industries, and finally have a main shaft structure that can solve the drawbacks.

Disclosure of Invention

The present invention provides a spindle structure, which has a distribution ring, the air flow entering the distribution ring has a temporary storage space, the air flow temporarily stored at the distribution ring can be discharged out of the spindle structure through the annular gap between the fourth circumferential surface of the rotating shaft and the distribution ring, and the distribution ring has the function of uniformly distributing the air flow.

In order to achieve the purpose, the invention adopts the following technical scheme:

a spindle structure comprising:

the first body is arranged on the machine tool and provided with a first containing groove, the first body is provided with a first air inlet hole, and the first air inlet hole is connected with an air flow source;

the second body is fixedly arranged at one end of the first body and is provided with a second containing groove, the second containing groove is aligned with the first containing groove, the second containing groove is in a circular through hole shape, one end of the second containing groove is provided with a third containing groove, the third containing groove is communicated with the second containing groove, the third containing groove is in a circular ring groove shape, the diameter of the third containing groove is larger than that of the second containing groove, so that a first abutting surface is arranged at the bottom of the third containing groove, the first abutting surface is arranged between the second containing groove and the third containing groove, the second body is provided with a second air inlet hole, the second air inlet hole is aligned with and communicated with the first air inlet hole, and the second air inlet hole is communicated with the third containing groove;

a distribution ring accommodated in the third accommodating groove of the second body and aligned with the second air inlet, wherein a first ring groove is formed in the outer peripheral surface of the distribution ring, the first ring groove and the second air inlet are aligned relatively, the first ring groove is in a concave ring groove shape, a second ring groove is formed in the inner peripheral surface of the distribution ring, the second ring groove is in a concave ring groove shape, a plurality of through grooves are formed in the distribution ring, and each through groove penetrates through the distribution ring, i.e. each through groove enables the first ring groove and the second ring groove to be communicated;

a rotating shaft, which penetrates through the first containing groove of the first body, the second containing groove of the second body and the distribution ring, and rotates in the first containing groove and the second containing groove, one end of the rotating shaft is provided with a fourth peripheral surface, the fourth peripheral surface is aligned with the inner peripheral surface of the distribution ring and the second annular groove, a gap is formed between the distribution ring and the fourth peripheral surface of the rotating shaft, and the fourth peripheral surface is in an inclined plane shape, i.e. the outer diameter of the fourth peripheral surface is the smallest as the fourth peripheral surface goes outside;

the air flow is sequentially distributed from the first air inlet, the second air inlet, the first annular groove, the plurality of through grooves and the second annular groove to enter the fourth circumferential surface of the rotating shaft;

a front cover fixedly arranged at the end part of the second body, wherein one end of the rotating shaft is convexly extended and pivoted on the front cover, namely the rotating shaft sequentially penetrates through the front cover, the distribution ring, the second containing groove and the first containing groove;

a first gap and a second gap are arranged between the fourth circumferential surface and the inner circumferential surface of the distribution ring, and the first gap is larger than the second gap.

The first containing groove is in a perforation shape, the first containing groove is in a penetrating shape, the first air inlet hole is arranged on one side of the first containing groove, the first air inlet hole is in a perforation shape, the section of the second air inlet hole is in a round hole shape, the second air inlet hole is in an L-shaped path shape, the second body is provided with a first screw hole, the first screw hole is communicated with the second air inlet hole, the end part of the first screw hole is in an internal thread shape, a first screwing piece is arranged, the first screwing piece is combined with the end part of the first screw hole of the second body, the first screw hole is in a closed shape, and the first screwing piece is in an external thread shape.

The end face of the distribution ring abuts against the first abutting face, the distribution ring is in a circular ring shape, the distribution ring can be elastic or inelastic, a gap or no gap can be formed between the outer peripheral face of the distribution ring and the inner peripheral face of the third containing groove, the section of the distribution ring is in an H shape, the second ring groove and the first ring groove are symmetrical relative to the distribution ring, the through grooves are circular through holes, the through grooves are arranged in an annular shape, and all the through grooves are not aligned with the second air inlet holes or one through groove is aligned with the second air inlet holes.

A fourth accommodating groove is arranged at the other end of the second accommodating groove, the fourth accommodating groove is communicated with the second accommodating groove, the fourth accommodating groove is in a circular groove shape, the diameter of the fourth accommodating groove is larger than that of the second accommodating groove, so that a second abutting surface is arranged at the bottom of the fourth accommodating groove, and the second abutting surface is arranged between the second accommodating groove and the fourth accommodating groove; one end of the rotating shaft is provided with a third circumferential surface; the first elastic oil seal is arranged at the fourth containing groove of the second body, the end part of the first elastic oil seal abuts against the second abutting surface, the first elastic oil seal has outward-extending elasticity, a gap is not formed between the first elastic oil seal and the fourth containing groove of the two bodies, and the rotating shaft penetrates through the first containing groove of the first body, the second containing groove of the second body, the distribution ring and the first elastic oil seal.

The first elastic oil seal comprises a first ring body, a second ring body, a third ring body, a fourth ring body and a retaining ring; the first ring body is in a circular ring shape, the outer peripheral surface of the first ring body is provided with a first peripheral surface, the first peripheral surface is the outer peripheral surface of the first elastic oil seal, the first peripheral surface is abutted against the inner peripheral surface of the fourth containing groove, and no gap exists between the first peripheral surface and the fourth containing groove; the second ring body is in a circular ring shape and is accommodated in the first ring body; the third ring body is in a circular ring shape, the third ring body is accommodated in the first ring body, the second ring body is arranged between the first ring body and the third ring body, the first ring body, the second ring body and the third ring body are slightly assembled into a C shape, the inner circumferential surface of the third ring body is provided with a second circumferential surface, the second circumferential surface is the inner circumferential surface of the first elastic oil seal, the section of the third ring body is in a V shape, and the second circumferential surface is in a minimum area shape; the fourth ring body is in a circular ring shape and is accommodated in the first ring body, the second ring body and the third ring body, so that the first ring body, the second ring body and the third ring body are assembled, and the first ring body and the third ring body have outward-extending elasticity; the retaining ring is in a circular ring shape and is buckled on the peripheral surface of the third ring body, the third peripheral surface is abutted against the second peripheral surface of the first elastic oil seal, and the second peripheral surface is elastically pressed against the third peripheral surface.

One end of the fourth circumferential surface abuts against the first abutting surface of the second body, the rotating shaft is provided with a fifth circumferential surface, and the diameter of the fifth circumferential surface is smaller than that of the fourth circumferential surface so that a third abutting surface is arranged; the front cover limits the third abutting surface, so that the rotating shaft is not separated from the front cover, and an L-shaped airflow channel is formed between the front cover and the fifth circumferential surface of the rotating shaft as well as between the front cover and the third abutting surface.

And a second elastic oil seal is arranged in the first body and aligned with the other end of the rotating shaft.

The power mechanism is arranged at the other end part of the first body, the power mechanism is exposed out of the first body, the power mechanism is sleeved with the rotating shaft, and when the power mechanism is driven, the power mechanism drives the rotating shaft to rotate.

Wherein the first elastic oil seal can be replaced by a set of common labyrinth rings.

The second body is provided with a second screw hole which is communicated with the third containing groove of the second body, the second screw hole is symmetrical to the first screw hole, the end part of the second screw hole is in an internal thread shape, the first ring groove of the distribution ring is in a relative positive shape with the first screw hole and the second screw hole, a second screw part is arranged, the second screw part is combined with the end part of the second screw hole, the second screw part is provided with a through hole, the third containing groove is communicated with the outside through the through hole, and partial air flow can be discharged out of the main shaft structure through the through hole.

The invention has the beneficial effects that: the first air inlet of the first body is connected with an air flow source, the air flow enters the fourth peripheral surface of the rotating shaft from the first air inlet, the second air inlet of the second body and the distribution ring in sequence, the air flow enters the distribution ring and is provided with a temporary storage space, the air flow temporarily stored in the distribution ring can be discharged out of the main shaft structure from an annular gap between the fourth peripheral surface of the rotating shaft and the distribution ring, so that the dust or the cutting fluid is prevented from entering the main shaft structure, and the distribution ring has the effect of uniformly distributing the air flow at the fourth peripheral surface. The distributing ring is accommodated in the third accommodating groove, the peripheral surface of the distributing ring is provided with a first annular groove, the inner peripheral surface of the distributing ring is provided with a second annular groove, the distributing ring is provided with a plurality of through grooves, and each through groove enables the first annular groove and the second annular groove to be communicated, so that the distributing ring has the effects of temporarily storing and uniformly distributing the air flow.

While the present invention has been described in connection with the drawings and the accompanying drawings, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

Drawings

Fig. 1 is an exploded perspective view of the spindle structure of the present invention.

Fig. 2 is an exploded perspective view of a part of the spindle structure according to the present invention.

Fig. 3 is a side view of the first elastic oil seal of the main shaft structure of the invention.

Fig. 4 is a cross-sectional view taken at a-a of fig. 3 in accordance with the present invention.

Fig. 5 is an enlarged view of the invention at B in fig. 4.

Fig. 6 is a perspective assembly view of the spindle structure of the present invention.

Fig. 7 is a front view of the spindle structure of the present invention.

Fig. 8 is a cross-sectional view at C-C of fig. 7 of the present invention.

Fig. 9 is an enlarged view of the invention at D in fig. 8.

Fig. 10 is an enlarged view of the invention at E in fig. 8.

Fig. 11 is an enlarged view of the invention at F in fig. 8.

Fig. 12 is a cross-sectional view of a second embodiment of the invention.

Fig. 13 is an enlarged view of the invention at F in fig. 12.

Fig. 14 is an exploded perspective view of a part of the components of the third embodiment of the present invention.

Fig. 15 is a cross-sectional view of a third embodiment of the present invention.

Fig. 16 is an enlarged view of the invention at G in fig. 15.

10 first body 11 first vessel

12 first air inlet

20 second body 21 second vessel

22 third containing groove 23 first butting face

24 second air inlet hole 25 first screw hole

26 fourth groove 27 second butting face

28 second screw hole

30 distribution ring 31 first ring groove

32 second ring groove 33 through groove

40 first screw 41 second screw

411 perforation

50 first elastic oil seal 51 first ring body

511 first circumferential surface 52 second ring body

53 third ring body 531 second peripheral surface

54 fourth ring 55 clasp

60 rotating shaft 61 third peripheral surface

62 fourth circumferential surface 63 fifth circumferential surface

64 third abutting surface 65 first gap

66 second gap 67 airflow channel

70 front cover 80 second elastic oil seal

90 power mechanism

Detailed Description

Referring first to fig. 1 to 5, fig. 1 is an exploded perspective view of a spindle structure of the present invention, fig. 2 is an exploded perspective view of a part of the spindle structure of the present invention, fig. 3 is a side view of a first elastic oil seal 50 of the spindle structure of the present invention, fig. 4 is a cross-sectional view taken along line a-a of fig. 3 of the present invention, fig. 5 is an enlarged view taken along line B of fig. 4 of the present invention, and the present invention relates to a spindle structure, which includes:

a first body 10, the first body 10 is disposed on the machine tool, the first body 10 is provided with a first accommodating groove 11, the first accommodating groove 11 is in a through hole shape, the first body 10 is provided with a first air inlet hole 12, the first air inlet hole 12 is connected with an air flow source, the first air inlet hole 12 is disposed on one side of the first accommodating groove 11, and the first air inlet hole 12 is in a through hole shape;

a second body 20, please refer to fig. 2, the second body 20 is fixedly disposed at one end of the first body 10, the second body 20 is provided with a second accommodating groove 21, the second accommodating groove 21 is aligned with the first accommodating groove 11, the second accommodating groove 21 is in a circular through hole shape, one end of the second accommodating groove 21 is provided with a third accommodating groove 22, the third accommodating groove 22 is communicated with the second accommodating groove 21, the third accommodating groove 22 is in a circular ring groove shape, the diameter of the third accommodating groove 22 is larger than that of the second accommodating groove 21, so that the bottom of the third accommodating groove 22 is provided with a first abutting surface 23, the first abutting surface 23 is disposed between the second accommodating groove 21 and the third accommodating groove 22, the second body 20 is provided with a second air inlet 24, the second air inlet 24 is aligned with and communicated with the first air inlet 12, the second air inlet 24 is communicated with the third accommodating groove 22, the cross section of the second air inlet 24 is in a circular hole shape 24, the second air inlet path is in a circular hole shape 24, the second body 20 is provided with a first screw hole 25, the first screw hole 25 is communicated with the second air inlet 24, the end of the first screw hole 25 is in an internal thread shape, the other end of the second accommodating groove 21 is provided with a fourth accommodating groove 26, the fourth accommodating groove 26 is communicated with the second accommodating groove 21, the fourth accommodating groove 26 is in a circular groove shape, the diameter of the fourth accommodating groove 26 is larger than that of the second accommodating groove 21, so that the bottom of the fourth accommodating groove 26 is provided with a second abutting surface 27, and the second abutting surface 27 is arranged between the second accommodating groove 21 and the fourth accommodating groove 26;

a distribution ring 30, please refer to fig. 2, the distribution ring 30 is accommodated in the third accommodating groove 22 of the second body 20, the distribution ring 30 is aligned with the second air inlet 24, the end surface of the distribution ring 30 abuts against the first abutting surface 23, the distribution ring 30 is in a circular ring shape, the distribution ring 30 can be slightly elastic or inelastic, a gap or no gap can be provided between the outer circumferential surface of the distribution ring 30 and the inner circumferential surface of the third accommodating groove 22, the outer circumferential surface of the distribution ring 30 is provided with a first ring groove 31, the first ring groove 31 and the second air inlet 24 are relatively aligned, the first ring groove 31 is in a concave ring groove shape, the inner circumferential surface of the distribution ring 30 is provided with a second ring groove 32, the second ring groove 32 is in a concave ring groove shape, the cross section of the distribution ring 30 is slightly H-shaped, the second ring groove 32 and the first ring groove 31 are relatively symmetrical to the distribution ring 30, the distribution ring 30 is provided with a plurality of through grooves 33, each through groove 33 penetrates through the distribution ring 30, that is, each through groove 33 enables the first ring groove 31 and the second ring groove 32 to be communicated, the through grooves 33 are in a circular through hole shape, the through grooves 33 are in an annular arrangement shape, and all the through grooves 33 are not aligned with the second air inlet holes 24 or one through groove 33 is aligned with the second air inlet holes 24;

a first screw 40, the first screw 40 is combined with the end of the first screw 25 of the second body 20, so that the first screw 25 is closed, and the first screw 40 is in an external thread shape;

a first elastic oil seal 50, the first elastic oil seal 50 being accommodated in the fourth accommodating groove 26 of the second body 20, an end of the first elastic oil seal 50 abutting against the second abutting surface 27, the first elastic oil seal 50 having a slight outward-extending elasticity, and no gap being formed between the first elastic oil seal 50 and the fourth accommodating groove 26 of the second body 20, please refer to fig. 3 to 5, wherein the first elastic oil seal 50 includes a first ring body 51, a second ring body 52, a third ring body 53, a fourth ring body 54 and a retaining ring 55;

the first ring body 51 is a circular ring body, the outer peripheral surface of the first ring body 51 is provided with a first peripheral surface 511, the first peripheral surface 511 is the outer peripheral surface of the first elastic oil seal 50, the first peripheral surface 511 is abutted against the inner peripheral surface of the fourth containing groove 26, and no gap exists between the first peripheral surface 511 and the fourth containing groove 26;

the second ring body 52 is a circular ring body, and the second ring body 52 is accommodated in the first ring body 51;

the third ring 53 is a circular ring, the third ring 53 is accommodated in the first ring 51, the second ring 52 is arranged between the first ring 51 and the third ring 53, the first ring 51, the second ring 52 and the third ring 54 are arranged in a C shape, the inner circumferential surface of the third ring 53 is provided with a second circumferential surface 531, the second circumferential surface 531 is the inner circumferential surface of the first elastic oil seal 50, the cross section of the third ring 53 is a V shape, so that the second circumferential surface 531 has a minimum area;

the fourth ring 54 is circular ring, the fourth ring 54 is accommodated in the first ring 51, the second ring 52 and the third ring 53, the first ring 51, the second ring 52 and the third ring 53 are assembled, and the first ring 51 and the third ring 53 have slight outward-extending elasticity;

the retaining ring 55 is in the shape of a circular ring, and the retaining ring 55 is fastened to the outer peripheral surface of the third ring body 53;

a rotating shaft 60, the rotating shaft 60 is disposed through the first receiving groove 11 of the first body 10, the second receiving groove 21 of the second body 20, the distribution ring 30 and the first elastic oil seal 50, the rotating shaft 60 rotates in the first receiving groove 11 and the second receiving groove 21, one end of the rotating shaft 60 is provided with a third circumferential surface 61 and a fourth circumferential surface 62, the third circumferential surface 61 abuts against the second circumferential surface 531 of the first elastic oil seal 50, the second circumferential surface 531 slightly elastically presses against the third circumferential surface 61, the fourth circumferential surface 62 aligns with the inner circumferential surface of the distribution ring 30 and the second circumferential groove 32, a gap is formed between the distribution ring 30 and the fourth circumferential surface 62 of the rotating shaft 60, the fourth circumferential surface 62 is in an inclined plane shape, that is, the outer diameter of the fourth circumferential surface 62 is the smallest as the fourth circumferential surface 62 goes beyond the outer surface, and one end of the fourth circumferential surface 62 abuts against the first abutting surface 23 of the second body 20, the rotating shaft 60 is provided with a fifth peripheral surface 63, and the diameter of the fifth peripheral surface 63 is smaller than that of the fourth peripheral surface 62, so that a third abutting surface 64 is arranged; whether the green font is changed into: the shoulder formed is the third abutting surface 64.

The air flow is sequentially distributed from the first air inlet 12, the second air inlet 24, the first annular groove 31, the plurality of through grooves 33 and the second annular groove 32 to enter the fourth circumferential surface 62 of the rotating shaft 60;

a front cover 70, the front cover 70 is fixedly installed and combined at the end of the second body 20, the front cover 70 provides a protruding and pivoting of one end of the rotating shaft 60, that is, the rotating shaft 60 sequentially penetrates through and is pivoted to the front cover 70, the distribution ring 30, the second accommodating groove 21, the first elastic oil seal 50 and the first accommodating groove 11, the front cover 70 limits the third abutting surface 64, so that the rotating shaft 60 is not separated from the front cover 70;

as shown in fig. 10, a first gap 65 and a second gap 66 are formed between the fourth circumferential surface 62 and the inner circumferential surface of the distribution ring 30, the first gap 65 is larger than the second gap 66, and an L-shaped airflow channel 67 is formed between the front cover 70 and the fifth circumferential surface 63 and the third abutting surface 64 of the rotation shaft 60.

A second elastic oil seal 80, the second elastic oil seal 80 being accommodated in the first body 10, the second elastic oil seal 80 being away from the first elastic oil seal 50, the second elastic oil seal 80 being aligned with the other end of the rotating shaft 60, the second elastic oil seal 80 having the same structure as the first elastic oil seal 50;

a power mechanism 90, the power mechanism 90 is disposed at the other end of the first body 10, the power mechanism 90 protrudes out of the first body 10, the power mechanism 90 is sleeved with the rotating shaft 60, and when the power mechanism 90 is driven, the power mechanism 90 drives the rotating shaft 60 to rotate.

Referring to fig. 6 to 8, fig. 6 is a perspective view of the main shaft structure of the present invention, fig. 7 is a front view of the main shaft structure of the present invention, fig. 8 is a cross-sectional view taken along the line C-C in fig. 7, as is clear from the figure, the second body 20 is fixedly assembled to one end of the first body 10, the distribution ring 30 is accommodated in the third accommodating groove 22 of the second body 20, the first screw 40 is assembled to the end of the first screw 25 to seal the first screw 25, the first elastic oil seal 50 is accommodated in the fourth accommodating groove 26, the rotating shaft 60 is pivotally inserted into the first accommodating groove 11, the second accommodating groove 21, the distribution ring 30 and the first elastic oil seal 50, the front cover 70 is fixedly assembled to the end of the second body 20 in a protruding manner, one end of the rotating shaft 60 is pivotally inserted into the front cover 70, the second elastic oil seal 80 is accommodated in the first elastic oil seal 10, the second elastic oil seal 80 is aligned with the other end of the rotating shaft 60, the power mechanism 90 is disposed at the other end of the first body 10, the power mechanism 90 protrudes out of the first body 10, and the power mechanism 90 is sleeved with the rotating shaft 60.

Referring to fig. 9, fig. 9 is an enlarged view of the position D in fig. 8 of the present invention, the second body 20 is fixedly mounted at one end of the first body 10, the second air inlet 24 of the second body 20 is aligned with the first air inlet 12, the distribution ring 30 is accommodated in the third accommodating groove 22, and the first screw 40 is coupled at an end of the first screw 25 to close the first screw 25.

Referring to fig. 10, fig. 10 is an enlarged view of the position E in fig. 8 of the present invention, as can be clearly seen from the illustration, the fourth circumferential surface 62 is in an inclined plane shape, a first gap 65 and a second gap 66 are formed between the fourth circumferential surface 62 and the inner circumferential surface of the distribution ring 30, the first gap 65 is greater than the second gap 66, and an L-shaped air flow channel 67 is formed between the front cover 70, the fifth circumferential surface 63 and the third abutting surface 64.

Referring to fig. 11, fig. 11 is an enlarged view of the portion F in fig. 8 of the present invention, as can be clearly seen from the illustration, the first elastic oil seal 50 is accommodated in the fourth accommodating groove 26, the first peripheral surface 511 abuts against the inner peripheral surface of the fourth accommodating groove 26, the rotating shaft 60 sequentially penetrates through and is pivotally disposed at the front cover 70, the distributing ring 30, the second accommodating groove 21, the first elastic oil seal 50 and the first accommodating groove 11, and the third peripheral surface 61 abuts against the second peripheral surface 531 of the first elastic oil seal 50.

Referring to fig. 12 and 13, fig. 12 is a sectional view of a second embodiment of the present invention, fig. 13 is an enlarged view of F in fig. 12, which is clearly shown in the figure, and the first elastic oil seal 50 can be replaced by a set of common labyrinth rings, which also has the same effect.

Referring still to fig. 14-16, fig. 14 is an exploded perspective view of a portion of the components of the third embodiment of the present invention, fig. 15 is a cross-sectional view of a third embodiment of the invention, fig. 16 is an enlarged view at G of fig. 15 of the invention, as is apparent from the illustration, the second body 20 is provided with a second screw hole 28, the second screw hole 28 is communicated with the third containing groove 22 of the second body 20, the second screw hole 28 is symmetrical to the first screw hole 25, the end of the second screw hole 28 is an internal thread, the first ring groove 31 of the distribution ring 30 is opposite to the first screw hole 25 and the second screw hole 28, and is provided with a second screw element 41, the second screw member 41 is combined with the end portion of the second screw hole 28, the second screw member 41 is provided with a through hole 411, the through hole 411 makes the third container 22 communicate with the outside, and the through hole 411 can allow part of the air flow to be discharged out of the spindle structure.

The main shaft structure of the invention has the advantages that:

1. the first air inlet 12 of the first body 10 is connected to an air flow source, the air flow sequentially enters the fourth circumferential surface 62 of the rotating shaft 60 through the first air inlet 12, the second air inlet 24 of the second body 20, and the distribution ring 30, the air flow enters the distribution ring 30 and has a temporary storage space, when the rotating shaft 60 rotates with the power mechanism 90 in the first and second accommodating grooves 11 and 21, the air flow temporarily stored in the distribution ring 30 can be discharged out of the spindle structure through an annular gap between the fourth circumferential surface 62 of the rotating shaft 60 and the distribution ring 30, so as to prevent the dust or cutting fluid from entering the inside of the spindle structure, and the distribution ring 30 has an effect of uniformly distributing the air flow at the fourth circumferential surface 62.

2. The distribution ring 30 is accommodated in the third accommodating groove 22, the outer peripheral surface of the distribution ring 30 is provided with a first annular groove 31, the inner peripheral surface of the distribution ring 30 is provided with a second annular groove 32, so that the section of the distribution ring 30 is approximately in an H shape, the distribution ring 30 is provided with a plurality of through grooves 33, each through groove 33 enables the first annular groove 31 and the second annular groove 32 to be communicated, and the distribution ring 30 has the effects of temporarily storing and uniformly distributing the air flow.

3. Generally speaking, the air flow has a certain amount of moisture, because the fourth peripheral surface 62 is in an inclined plane shape, a first gap 65 and a second gap 66 are formed between the fourth peripheral surface 62 and the inner peripheral surface of the distribution ring 30, the first gap 65 is larger than the second gap 66, so that the air flow is almost completely discharged out of the spindle structure through the first gap 65, the probability of the air flow flowing into the spindle structure through the second gap 66 is quite low, and thus the moisture of the air flow entering the interior of the spindle structure and corroding parts can be greatly reduced.

4. An L-shaped airflow channel is formed between the front cover 70 and the fifth circumferential surface 63 and the third abutting surface 64, and the probability of dust or cutting fluid entering the fourth circumferential surface 62 of the rotating shaft 60 through the airflow channel 67 is low.

5. The first elastic oil seal 50 has a slight outward expansion elasticity, there is no gap between the first elastic oil seal 50 and the fourth accommodating groove 26 of the two bodies 20, and the first elastic oil seal 50 is slightly elastically pressed against the third peripheral surface 61 of the rotating shaft 60, so that the probability of the air flow entering the first body 10 is very low.

Therefore, the main shaft structure of the invention has industrial utilization, novelty and advancement, and can be applied according to law as meeting the application requirements of the invention patent.