TW201811484A - Spindle structure capable of effectively preventing liquids from entering into spindle structure - Google Patents

Abstract

The present invention relates to a spindle structure, which comprises: a main body configured with a first receiving groove and a plurality of first screwing portions; an inner ring set which is fixed at one end of the main body and is configured with a second receiving groove to be aligned with the first receiving groove, wherein one end of the inner ring is configured with a first inner circumferential surface and a first drainage hole and the first drainage hole is in the form of a circuitous path; a rotating shaft, which is pivoted at the first receiving groove and the second receiving groove and is configured with a first outer circumferential surface, a first end surface and a plurality of annular notches; and, a front cover set, which is fixed at the end of the inner ring pivoted with the rotating shaft and comprises a front cover, wherein the front cover is configured with a second inner circumferential surface, and the second inner circumferential surface is pivoted with the first outer circumferential surface, and the second inner circumferential surface is configured with a plurality of annular grooves to be aligned with each of the annular notches, and the front cover is configured with a second drainage hole which is in the form of a circuitous path.

Description

   Spindle structure   

The present invention relates to a main shaft structure, and particularly to a main shaft structure which can be arranged vertically or horizontally. When the main shaft structure is arranged horizontally, the first drainage hole and the second drainage hole in a roundabout path are more Can reduce the probability that each liquid enters the main shaft structure from the first drainage hole and the second drainage hole, that is, whether the main shaft structure is arranged vertically or horizontally, the main shaft structure can be designed with the same structure, the first drainage hole And the second drainage hole is in a circuitous path, which can effectively reduce each liquid from entering the main shaft structure.

According to my previous knowledge, the spindle structure used in machine tools, such as Taiwan patent application number: 103207142, certificate number: M487800, patent name: Waterproof and dustproof processing machine spindle structure improvement, the patent case structure is: The waterproof and dustproof processing machine main shaft structure is improved, including: a set of tubes 20, a hollow tube structure and a set of tube end faces 21 at one end, and the sleeve 20 extends along an axial direction X, and the vertical axial direction X is defined as a radial direction Y; a shaft member 30, a sleeve sleeve multiple bearing 40, a shaft sleeve 50 and at least one drainage dust ring 60 are inserted into the sleeve 20, wherein: the shaft member 30 has a hollow channel 31 and one end is a connecting section 32 It is used to connect a machine tool, and the outer surface of the shaft member 30 has a ring recess 34, and the ring recess 34 has a first end surface 341 and a second end surface 342 opposite to each other, and connects the first end surface 341 and the first end surface 341. One side 343 of the two end faces 342; the bearings 40 are sleeved outside the shaft member 30 and located in the ring recess 34 and the sleeve 20, and each of the bearings 40 is arranged adjacent to each other, and one of the bearings 40 is abutted against The first end surface 341 and the side surface 343, and its The bearing 40 is at least abutted against the side surface 343. The sleeve 50 has an axial surface portion 51 extending in the axial direction X and a radial surface portion 52 extending in the radial direction Y. The axial surface portion 51 has an axial end surface 511 in the axial direction. The diameter surface portion 52 has a diameter end surface 521 in the radial direction. The sleeve 50 passes through the shaft member 30 and is located in the ring recessed portion 34. The shaft surface portion 51 of the sleeve 50 abuts against the ring recessed portion 34. The side surface 343, and the shaft end surface 511 of the shaft surface portion 51 abuts against one of the bearings 40, and the diameter surface portion 52 of the shaft sleeve 50 abuts against the second end surface 342 of the ring concave portion 34; At least one drainage dustproof channel 61 is provided along the radial direction Y, and the drainage dustproof ring 60 passes through the ring recess 34, covers the shaft sleeve 50, and abuts against the casing end surface 21 of the casing 20, and the drainage A collection space 70 is respectively provided between the drainage dust channel 61 of the dust ring 60 and the shaft sleeve 50 and the shaft member 30.

But the lack of this conventional spindle structure lies in:

1. Please supplement Figure 2 and Figure 3 of the Bulletin. The drainage dust ring 60 is provided with at least one drainage dust channel 61 in the radial direction Y, but the drainage dust channel 61 is provided in a straight hole shape in the radial direction Y. When the main shaft of the processing machine cooperates with the cutting tool for cutting operations, the straight-drained drainage channel 61 is easy to allow cutting fluid, chips or lubricating oil to enter the spindle from the drainage channel 61. This is the spindle structure. Missing.

2. When the main shaft structure is horizontally arranged, the drainage dust channel 61 which is arranged in a radial direction and formed in a straight hole shape is downward, and the cutting fluid, chips or lubricating oil is added into the main shaft structure Chance.

In view of the lack of the above-mentioned conventional spindle structure, the inventor has, through years of manufacturing, design, and production experience in related industries, finally came up with a product that can solve the conventional spindle structure.

When the conventional main shaft structure is horizontally arranged, the drain and dust-proof channel which is arranged in a radial direction and formed in a straight hole is downward, so that the probability of the cutting fluid, chips or lubricating oil entering the main shaft structure is increased. The invention relates to a main shaft structure, in particular to a main shaft structure system which can be arranged vertically or horizontally. When the main shaft structure is arranged horizontally, the first drainage hole and the second drainage hole system in a roundabout path shape. It can further reduce the probability that each liquid enters the main shaft structure from the first drainage hole and the second drainage hole, that is, whether the main shaft structure is vertically or horizontally arranged, the main shaft structure can be designed with the same structure. Both the drainage hole and the second drainage hole have a circuitous path can effectively reduce each liquid from entering the main shaft structure.

The invention relates to a main shaft structure, which comprises: a system provided with a first receiving groove and a plurality of first screwing portions; an inner ring body group, the inner ring body group is fixedly arranged at the end of the body; The inner ring body system includes: an inner ring body; the inner ring system is provided with a second receiving groove to be opposite to the first receiving groove of the body, and one end of the inner ring body is provided with a first inner peripheral surface and A first drainage hole, the first drainage hole is a circuitous path; a rotating shaft is pivotally arranged at the first receiving groove and the second receiving groove of the body, and the rotating shaft is provided with a first outer peripheral surface, The first end surface and the plurality of rings are notched; a front cover group is fixedly disposed at an end of the inner ring body, the front cover group is pivotally connected to the rotation shaft, and the front cover group includes: a front cover; the The front cover is provided with a second inner peripheral surface, the second inner peripheral surface is pivotally connected to the first outer peripheral surface, and a plurality of ring grooves are provided at the second inner peripheral surface to be relatively positive to each ring notch. The front cover is provided with a second drainage hole, and the second drainage hole is in a roundabout shape.

If the main shaft structure is arranged vertically, the first outer peripheral surface is pivoted with the second inner peripheral surface, so there is a gap between the first outer peripheral surface and the second inner peripheral surface, and the rotary shaft drives the tool to rotate rapidly At this time, each liquid such as cutting fluid or coolant is used between the tool and the workpiece. When each liquid enters upward, it can be discharged from the first drainage hole and the second drainage hole, thereby reducing the gap between the liquids. Probability of entering the spindle structure. The first plug member and the second plug member are respectively accommodated in the first drainage hole and the second drainage hole, so that the first drainage hole and the second drainage hole are in a circuitous path shape, and many spindles The structure is horizontally arranged, that is, the axis of the main shaft structure is horizontal. The first drainage hole and the second drainage hole are downwardly arranged. When the rotating shaft rotates rapidly, the first drainage hole and the The second drainage system has a circuitous path, and the probability that each liquid enters the main shaft structure through the first drainage hole and the second drainage hole is greatly reduced.

In order to fully understand the effects of the present invention by members of the Bureau and those skilled in the art, the structure and composition of the present invention are explained in conjunction with the drawings and figures, but the following are only used to explain the implementation of the present invention. For example, it is not intended to limit the present invention in any form, and any modification made under the spirit of the present invention should still fall within the protection scope of the present invention.

10‧‧‧ Ontology

11‧‧‧ the first tank

12‧‧‧ the first screw joint

30‧‧‧ Inner ring body group

31‧‧‧ inner ring body

311‧‧‧Second tank

312‧‧‧First inner peripheral surface

313‧‧‧First drainage hole

3131‧‧‧First radial hole

3132‧‧‧Second radial hole

3133‧‧‧First axial hole

314‧‧‧ ring convex

315‧‧‧first perforation

316‧‧‧The first ring groove

32‧‧‧ the first plug

33‧‧‧Sealing ring

40‧‧‧The first screw joint

50‧‧‧rotation shaft

51‧‧‧Third tank

52‧‧‧First outer peripheral surface

53‧‧‧first end face

54‧‧‧Ring

55‧‧‧Ring recess

60‧‧‧ front cover group

61‧‧‧Front cover

611‧‧‧Second inner peripheral surface

612‧‧‧Ring groove

613‧‧‧Second drainage hole

6131‧‧‧Third radial hole

6132‧‧‧Second axial hole

614‧‧‧second perforation

62‧‧‧Second plug

70‧‧‧Second screw

The first figure is an exploded perspective view of the main shaft structure of the present invention.

The second figure is an exploded perspective view of the inner ring body group of the main shaft structure of the present invention.

The third figure is a side view of the inner ring body of the main shaft structure of the present invention.

The fourth figure is a sectional view at the third figure A-A of the present invention.

The fifth figure is a side view of the rotating shaft of the main shaft structure of the present invention.

The sixth figure is a cross-sectional view at the fifth figure B-B of the present invention.

The seventh figure is an exploded perspective view of the front cover group of the main shaft structure of the present invention.

Figure 8 is a side view of the front cover of the spindle structure of the present invention.

The ninth figure is a sectional view at C-C of the eighth figure of the present invention.

The tenth figure is a three-dimensional assembled view of some components of the main shaft structure of the present invention.

The eleventh figure is a three-dimensional combined view of the main shaft structure of the present invention.

Figure 12 is a side view of the main shaft structure of the present invention.

The thirteenth figure is a sectional view taken along the line D-D of the twelfth figure of the present invention.

The fourteenth figure is an enlarged view of the thirteenth figure E of the present invention.

Fig. 15 is a sectional view of an inner ring body according to a second embodiment of the present invention.

The sixteenth figure is a perspective view of a third embodiment of the present invention.

First, please refer to the first to ninth diagrams. The first diagram is an exploded perspective view of the spindle structure of the present invention, the second diagram is an exploded perspective view of the inner ring body group 30 of the spindle structure of the present invention, and the third diagram is the present invention. Side view of the inner ring body 31 of the main shaft structure, the fourth view is a cross-sectional view at the third diagram AA of the present invention, the fifth view is a side view of the rotation shaft 50 of the main shaft structure of the present invention, and the sixth view is the fifth view BB of the present invention The seventh view is an exploded perspective view of the front cover 60 of the main shaft structure of the present invention, the eighth view is a side view of the front cover 61 of the main shaft structure of the present invention, and the ninth view is a cross-sectional view at the eighth view CC of the present invention. The invention relates to a main shaft structure, which is used on a machine tool. The main shaft structure includes: a main body 10, which is provided on the machine tool, and the main body 10 is provided with a first receiving groove 11, and the first The receiving groove 11 is perforated. The first receiving groove 11 is penetrating. One end surface of the body 10 is provided with a plurality of first screwing portions 12. The plurality of first screwing portions 12 are formed by the first container. The grooves 11 are annularly arranged along the axis, and the number of the first screwing portions 12 is twelve, and It is a screw hole shape; an inner ring body group 30, please supplement as shown in the third figure, the inner ring body group 30 is fixed at the end of the body 10, and the inner ring body group 30 includes: an inner ring Body 31, a plurality of first plug members 32, and a seal ring 33; the inner ring body 31, as shown in the third and fourth figures, the inner ring body 31 is provided with a second receiving groove 311, and the second The receiving groove 311 is opposite to the first receiving groove 11 of the body 10, the second receiving groove 311 has a circular hole shape penetrating, one end of the inner ring body 31 is provided with a first inner peripheral surface 312, and the first An inner peripheral surface 312 surrounds the first receiving groove 311, and the inner ring body 31 is provided with a first drainage hole 313. The first drainage hole 313 is connected to the first inner peripheral surface 312 and the inner ring body 31. The outer peripheral surfaces are all connected. The first drainage hole 313 is a circuitous path, that is, the openings at the two ends of the first drainage hole 313 are not on the same axis. The first drainage hole 313 is an N-shaped path. The first drainage hole 313 includes a first radial hole 3131, a second radial hole 3132, and a first axial hole 3133. The first axial hole 3133 is connected to the first radial hole 3131 and the second radial hole. The radial holes 3132 are connected, and the first diameter The direction hole 3131 is parallel to the second radial hole 3132, and the first axial hole 3133 is perpendicular to the first radial hole 3131 and the second radial hole 3132. The second container A plurality of annular convex portions 314 are convexly provided between the groove 311 and the first inner peripheral surface 312. The annular convex portions 314 and the first inner peripheral surface 312 are provided at the same end surface of the inner ring body 31. The portion 314 is in the shape of a ring. The inner ring body 31 is provided with a plurality of first perforations 315. Each first perforation 315 is relatively positive to each first screwing portion 12 of the body 10. The first perforation 315 The number is the same as that of the first screwing portion 12, the plurality of first perforations 315 are circularly arranged with the second receiving groove 311 as an axis, the first perforations 315 are penetrating, and the inner ring body 31 The other end surface is provided with a first ring groove 316, which is opposite to the body 10, the first ring groove 316 is far from the first inner peripheral surface 312, and the first ring groove 316 The first plug member 32 is received in the first radial hole 3131, and the other first plug member 32 is received in the first drainage hole 313. Piece 32 is accommodated in the first axis At 3133, the plurality of first plug members 32 make the first drainage hole 313 take a circuitous path, the first plug members 32 take the shape of a round body; the seal ring 33 is accommodated at the first ring groove 316 The sealing ring 33 and the first ring groove 316 are in a tight fit state. The sealing ring 33 is provided between the body 10 and the inner ring body 31; a plurality of first screwing members 40, the first screwing The member 40 is threaded through the first perforation 315 of the inner ring body 31 and is screwed at the first screwing portion 12, so that the inner ring body group 30 is fixed at the end face of the body 10. The number of the joint members 40 is six, and the first screw joint member 40 is externally threaded. A rotating shaft 50 is supplemented by the fifth and sixth figures. At one end of the first receiving groove 11 of the main body 10 and the second receiving groove 311 of the inner ring body 31, one end of the rotating shaft 50 projects out of the inner ring body 31, and the rotating shaft 50 and the first receiving groove There are 11 pieces of bearing parts. One end of the rotating shaft 50 is provided with a third receiving groove 51. The third receiving groove 51 is used for receiving tools. The rotating shaft 50 is provided with a first outer peripheral surface 52. The outer peripheral surface 52 projects from the inner ring body 31 The rotating shaft 50 is provided with a first end surface 53 which abuts against the end surface of the inner ring body 31. A plurality of ring gaps 54 are provided at the first outer peripheral surface 52, and the plurality of ring gaps 54 The grooves 54 are linearly arranged in the axial direction of the rotating shaft 50. Each ring lacking groove 54 is a ladder shape. The rotating shaft 50 is provided with a ring recess 55 near the first end surface 53. The ring recess 55 is It is accommodated at the annular convex portion 314 of the inner ring body 31, so that the annular concave portion 55 and the annular convex portion 55 are in a circuitous gap shape, and the annular concave portion 55 is annular shape; a front cover group 60, Please supplement as shown in the seventh figure. The front cover group 60 is fixed at the end of the inner ring body 31. The front cover group 60 is pivoted with the rotation shaft 50. The front cover group 60 includes : The front cover 61 and the plurality of second plugs 62; the front cover 61 is supplemented by the eighth and ninth illustrations. The front cover 61 is provided with a second inner peripheral surface 611 and a second inner peripheral surface. 611 is pivoted with the first outer peripheral surface 52 of the rotating shaft 50, the second inner peripheral surface 611 and the first outer peripheral surface 52 are in a loose fit structure, and the second inner peripheral surface 611 is provided at Plural ring grooves 612, each ring groove 612 is Opposite to each ring notch 54 of the rotating shaft 50, the front cover 61 is provided with a second drainage hole 613, and the second drainage hole 613 is formed on the outer peripheral surface of the ring groove 612 and the front cover 61. Connected, the second drainage hole 613 is a circuitous path, that is, the second drainage hole 613 is not on the same axis at the open end of the second drainage hole 613, the second drainage hole 613 is an N-shaped path, and the second The drainage hole 613 includes four third radial holes 6131 and a second axial hole 6132. The second axial hole 6132 is in communication with the four third radial holes 6131. The four third radial holes The holes 6131 are parallel, the second axial hole 6132 is perpendicular to the four third radial holes 6131, the front cover 61 is provided with a plurality of second perforations 614, and each of the second perforations 614 is Relative to each first perforation 315, the number of the second perforations 614 is one and a half of the first screwing portion 12 and the first perforation 315. The plurality of second perforations 614 are based on the second inner peripheral surface 611. It is arranged axially in a ring shape; the plurality of second plugs 62 are accommodated at appropriate positions of the second drainage hole 613, and the plurality of second plugs 62 include four transverse members and two Axial members, each transverse member is accommodated at a proper position of each third radial hole 6131, and the two axial members are accommodated at a proper position of the second axial hole 6132 The plurality of second plug members 62 make the second drainage hole 613 take a circuitous path; the plurality of second screw members 70 are passed through the first perforation 315 and the second perforation. 614 is screwed on the first screwing portion 12 so that the front cover group 60 is pressed against the end surface of the inner ring body group 30, so that the front cover group 60 is fixed to the body 10, and the first The number of the two screwing members 70 is six, and the second screwing member 70 and the first screwing member 40 are arranged in an annular space.

Please refer to the tenth to thirteenth diagrams. The tenth diagram is a three-dimensional assembly diagram of some components of the spindle structure of the present invention, the eleventh diagram is a three-dimensional assembly diagram of the spindle structure of the present invention, and the twelfth diagram is the present invention. The side view of the main shaft structure, the thirteenth figure is a cross-sectional view at the twelfth figure DD of the present invention, which can be clearly shown from the figure, the inner ring body group 30 is fixed at the end of the body 10, and the seal ring 33 is accommodated in the first ring groove 316, and the first screwing member 40 is threaded through the first perforation 315 and is screwed with the first screwing portion 12, so that the inner ring body group 30 and The main body 10 is fixed to each other. The rotating shaft 50 is pivotally disposed at the first receiving groove 11 and the second receiving groove 311. One end of the rotating shaft 50 protrudes from the inner ring body 31. The front cover group The 60 series is fixedly disposed at the end of the inner ring body group 30. The second inner peripheral surface 611 is pivoted with the first outer peripheral surface 52. The ring groove 612 is relatively positive with the ring notch 54. The The second screwing member 70 is threaded through the first through hole 315 and the second through hole 614 and is screwed with the first screwing portion 12, so that the front cover group 60 is pressed against the inner ring body group. At the end of 30 and with 10 fixedly disposed.

Please continue to refer to the fourteenth figure, which is an enlarged view of the thirteenth figure E of the present invention. The two first plug members 32 are accommodated in the first drainage hole 313, so that the first The drainage hole 313 has a circuitous path. The plurality of second plugs 62 are accommodated in the second drainage hole 613, so that the second drainage hole 613 is a circuitous path. The first drainage hole 313 and the second The drainage holes 613 all have an N-shaped path shape.

Please continue to refer to FIG. 15. FIG. 15 is a cross-sectional view of the inner ring body 31 of the second embodiment of the present invention. As can be clearly shown from the figure, the axis of the first drainage hole 313 of the inner ring body 31 The center is inclined with respect to the axis of the second volume 311.

Please continue to refer to the sixteenth figure. The sixteenth figure is a perspective view of the third embodiment of the present invention. Please compare it with the tenth figure. The appearance of the rotating shaft 50 is different from the rotating shaft 50 of the tenth figure. .

According to another embodiment of the present invention, the first drainage hole 313 and the second drainage hole 613 are in an N-shaped path shape, and similarly, the first drainage hole 313 and the second drainage hole 613 are in a U-shaped path shape.

In another embodiment of the present invention, the first drainage holes 313 are in a plurality and the second receiving grooves 311 are arranged in a ring shape as an axis. The second drainage holes 612 are in a plurality and have two inner peripheral surfaces. The axis 611 is arranged in a ring shape.

The advantages of the spindle structure of the present invention are:

1. If the main shaft structure is vertically arranged, the first outer peripheral surface 52 of the rotating shaft 50 is pivoted with the second inner peripheral surface 611 of the front cover 61, so the first outer peripheral surface 52 and the first outer peripheral surface 52 are pivoted. There will be a gap between the two inner peripheral surfaces 611. When the rotary shaft 50 drives the tool to rotate rapidly, various fluids such as cutting fluid or coolant are used between the cutter and the workpiece. When each fluid enters upward, it can be from the first The drainage holes 313 and the second drainage holes 613 are discharged, reducing the probability that each liquid enters the main shaft structure through the gap.

2. The first plug member 32 and the second plug member 62 are respectively accommodated in the first drainage hole 313 of the inner ring body 31 and the second drainage hole 613 of the front cover 61, so that the first The drainage hole 313 and the second drainage hole 613 are in a roundabout path, and many main shaft structures are horizontally arranged, that is, the axis of the main shaft structure is horizontal. The first drainage hole 313 and the second drainage hole 613 are horizontal. That is, it is disposed downward. When the rotating shaft 50 is rapidly rotated, the first drainage hole 313 and the second drainage 613 are in a roundabout path, and each liquid enters through the first drainage hole 313 and the second drainage hole 613. The probability of this spindle structure is greatly reduced.

3. The main shaft structure can be arranged vertically or horizontally. When the main shaft structure is arranged horizontally, the first drainage hole 313 and the second drainage hole 613 in a roundabout path are straight holes compared with the conventional drainage hole. The main shaft structure, such as Taiwan Patent Application No. 103207142, can further reduce the probability that each liquid enters the main shaft structure from the first drainage hole 313 and the second drainage hole 613, that is, whether the main shaft structure is arranged vertically or horizontally. The main shaft structures can all have the same structural design, and the first drainage hole 313 and the second drainage hole 613 have a circuitous path, which can effectively reduce each liquid from entering the main shaft structure.

4. The ring groove 54 is opposite to the ring groove 612, and the ring groove 612 is in communication with the second drainage hole 613. When the liquid enters the ring groove 54, the liquid flows to the ring. The groove 612 is also discharged from the second drainage hole 613.

5. When each liquid passes through the first inner peripheral surface 312 of the front cover 31, since the first inner peripheral surface 312 is in communication with the first drainage hole 313, each liquid will pass from the front cover 31. The first drainage hole 313 is discharged.

Therefore, the main shaft structure of the present invention has industrial applicability, novelty, and progressiveness, and can meet the application requirements of the invention patent, and apply according to law.

Claims (13)

    A spindle structure, which is used on a machine tool, comprises: a body; the system is provided on the machine tool; the system is provided with a first tank, the first tank is perforated, and A plurality of first screwing portions are arranged at one end surface of the body, and the plurality of first screwing portions are arranged in a ring shape with the first receiving groove as an axis; an inner ring body group is fixed by the inner ring body group. Located at the end of the body, the inner ring body system includes: an inner ring body; the inner ring body, the inner ring system is provided with a second receiving tank, and the second receiving tank is connected with the first body of the body The receiving groove is relatively positive, and the second receiving groove is in the shape of a round hole passing through. The inner ring system is provided with a plurality of first perforations. Each first perforation is relatively positive with each first screwing portion of the body. The number of the first perforations is the same as that of the first screwing portion. The plurality of first perforations are arranged in a ring shape with the second groove as an axis. The first perforations are penetrating. Piece, the first screwing part is threaded through the first perforation of the inner ring body and screwed at the first screwing part, so that the inner ring body is fixedly set on the At the end surface of the body; a rotating shaft is pivotally arranged at the first receiving groove of the body and the second receiving groove of the inner ring body, and one end of the rotating shaft is protruding outside the inner ring body, and A third receiving groove is provided at one end of the rotating shaft, and the third receiving groove is used for receiving a cutter. The rotating shaft is provided with a first outer peripheral surface. The first outer peripheral surface is protruded outside the inner ring. A first end surface is provided, the first end surface is abutted against the end surface of the inner ring body, and a plurality of ring notches are provided at the first outer peripheral surface. The direction is linearly arranged; a front cover group is fixedly arranged at the end of the inner ring body, the front cover group is pivoted with the rotation shaft, and the front cover group includes: a front cover The front cover, the front cover is provided with a second inner peripheral surface, the second inner peripheral surface is pivoted with the first outer peripheral surface of the rotating shaft, and the second inner peripheral surface is between the first outer peripheral surface and the first outer peripheral surface; It has a loose-fitting structure. A plurality of ring grooves are provided at the second inner peripheral surface, and each ring groove is relatively positive with each ring notch of the rotating shaft. The front cover is provided with Two drainage holes, the second drainage hole is in communication with the ring groove and the outer peripheral surface of the front cover, the second drainage hole is a roundabout path, the front cover is provided with a plurality of second perforations, each A second perforation is relatively positive to each first perforation. The number of the second perforations is one and a half of the first screwing portion and the first perforation. The plurality of second perforations are based on the second inner peripheral surface as The axis is arranged in a ring shape; a plurality of second screwing members are threaded through the first perforation and the second perforation and are screwed at the first screwing portion, so that the front cover group is pressed. Abutting on the end face of the inner ring body group, the front cover group is fixed with the body.         The spindle structure according to claim 1, wherein the number of the first screwing parts is twelve; the number of the first screwing parts is six, and the first screwing parts are externally threaded. The number of the second screwing members is six, and the second screwing members are arranged in an annular space with the first screwing members.         The spindle structure according to claim 1, wherein the inner ring body is provided with a first inner peripheral surface at one end, the first inner peripheral surface is surrounded by the first receiving groove, and the inner ring system is provided with a first drainage Hole, the first drainage hole is in communication with the first inner peripheral surface and the outer peripheral surface of the inner ring body, and the first drainage hole is in a detour path.         The main shaft structure according to claim 3, wherein the openings at the two ends of the first drainage hole are not on the same axis.         The main shaft structure according to claim 3, wherein the first drainage hole has an N-shaped path shape.         The spindle structure according to claim 3, wherein the first drainage hole includes a first radial hole, a second radial hole, and a first axial hole, and the first axial hole is connected to the first radial hole. The hole and the second radial hole are in communication, the first radial hole and the second radial hole system are in parallel, the first axial hole, the first radial hole, and the second radial hole. The hole system is vertical, the inner ring body group is provided with a plurality of first plugs, the plurality of first plugs are accommodated in the first drainage hole, and a first plug is accommodated in the first At the radial hole, another first plug member is accommodated at the first axial hole. The plurality of first plug members make the first drainage hole take a circuitous path, and the first plug member is round. shape.         The spindle structure according to claim 1, wherein a plurality of annular convex portions are convexly provided between the second receiving groove and the first inner peripheral surface, and the annular convex portions and the first inner peripheral surface are provided in the inner portion. At the same end surface of the ring body, the ring convex portion is ring-shaped, and the first end surface of the rotating shaft is provided with a ring concave portion, and the ring concave portion is accommodated at the ring convex portion of the inner ring body. The ring-shaped recessed portion and the ring-shaped protruding portion are formed in a circuitous gap shape, and the ring-shaped recessed portion is formed in a ring shape.         The spindle structure according to claim 1, wherein the other end surface of the inner ring body is provided with a first ring groove, the first ring groove is opposite to the body, and the first ring groove is connected to the first inner periphery. The first ring groove is in the shape of a concave ring groove facing away from each other. The inner ring body group is provided with a seal ring. The seal ring is accommodated at the first ring groove, and the seal ring is between the first ring groove and the first ring groove. The seal ring is in a tight fit state, and the seal ring is provided between the body and the inner ring body.         The main shaft structure according to claim 1, wherein each of the ring gaps has a ladder shape.         The main shaft structure according to claim 1, wherein the openings at the two ends of the second drainage hole are not on the same axis.         The main shaft structure according to claim 1, wherein the second drainage hole has an N-shaped path shape.         The main shaft structure according to claim 1, wherein the second drainage hole includes four third radial holes and a second axial hole, and the second axial hole is in line with the four third radial holes. Connected, the four third radial holes are parallel, the second axial holes are perpendicular to the four third radial holes, and the front cover group is provided with a plurality of second plugs. The plurality of second plug members are accommodated at appropriate positions of the second drainage hole. The plurality of second plug members include four transverse members and two axial members, and each transverse member is accommodated in the receiver. At a proper position of each third radial hole, the two axial members are accommodated at appropriate positions of the second axial hole, and the plurality of second plug members make the second drainage hole take a circuitous path shape. .         The main shaft structure according to claim 1, wherein an axis of the first drainage hole of the inner ring body is inclined with respect to an axis of the second receiving groove.