TW202241611A - Main shaft structure wherein the first gap is disposed between the rotating shaft and the first cover body, the second gap is disposed between the rotating shaft and the second cover body, and the first gap and the second gap are respectively in the shape of a roundabout path - Google Patents

Abstract

The present invention relates to a main shaft structure, which comprises a body provided with a first container slot; a rotating shaft pivotally disposed in the first container slot, wherein the rotating shaft is provided with a first fitting part and a second fitting part; a first cover body pivoted with the rotating shaft, wherein the first cover body is provided with a third fitting part for being pivotally arranged with the first fitting part, and a first gap with a roundabout path shape is formed between the third fitting part and the first fitting part; and a second cover body provided with a fourth fitting part for being pivotally arranged with the second fitting part, wherein the first fitting part and the second fitting part are disposed between the third fitting part and the fourth fitting part, a second gap is formed between the fourth fitting part and the second fitting part, the second gap has a roundabout path shape, and the second gap is communicated with the first gap. The body is assembled on various machine tools or various processing machine tools. The first container slot penetrates through the body. The first container slot is in the shape of a circular groove. The rotating shaft is in the shape of rapid rotation. At least one set of bearings is disposed between the rotating shaft and the first container slot. One end of the rotating shaft is used for the assembly of various knife tools. The first fitting part and the second fitting part are protruded out of the body.

Description

Spindle structure

The present invention is related to a main shaft structure, especially a main shaft structure in which the first gap is provided between the rotating shaft and the first cover, and the first gap is provided between the rotating shaft and the second cover. The second gap, the first gap and the second gap are in the shape of a roundabout path, with the first gap and the second gap, the liquid or cutting fluid passes through the first gap and the second gap through the two roundabout paths The probability of causing damage due to entering the interior of the main shaft structure is greatly reduced, and the two circuitous paths are more complicated.

According to our previous knowledge, the commonly used main shaft structure is also the patent case applied by the applicant. Taiwan patent case number: 107123297, certificate number: I647035, patent name: main shaft structure, the structure of the patent case lies in: a body 10 , the body 10 is assembled on the machine tool, the body 10 is provided with a first container 11, the first container 11 is perforated; a rotating shaft 20, the rotating shaft 20 is pivotally arranged on the second One end of the rotating shaft 20 is provided with a second containing groove 11, and the rotating shaft 20 is provided with a first peripheral surface 22 and a first abutting edge 23; a first cover 30, the first cover The body 30 is fixed at the end of the body 10, the first cover 30 is provided with a third container 31, and the third container 31 is provided for one end of the rotating shaft 20 to protrude and pivot. The outer peripheral surface of the container 31 is sequentially provided with a second abutting edge 32; The first peripheral surface 22 is sleeved so that the sealing member 50 is assembled on the rotating shaft 20 and rotates quickly with the rotating shaft 20. The sealing member 50 is provided with a first abutting surface 52. first meeting 52 is opposite to the first abutting edge 23 and the second abutting edge 32, or the first abutting surface 52 is in line with the first abutting edge 23 of the rotating shaft 20 and the second abutting edge 30 of the first cover 30. The abutting edges 32 are abutted against each other, and the end surface of the sealing member 50 is provided with a first end surface 57; at least one second cover 70 is fixed at the end of the rotating shaft 20, The sealing member 50 and the second cover 70 are combined with the rotating shaft 20 to rotate quickly with the rotating shaft 20. The second cover 70 is provided with a fourth abutting surface 71, and the fourth abutting surface 71 It is opposite to the first end surface 57 of the sealing member 50, that is, the sealing member 50 is assembled between the first abutting edge 23 and the fourth abutting surface 71 of the rotating shaft 20, so that the sealing The setting part 50 is restricted by the second cover 70 and cannot be disengaged from the rotating shaft 20 .

However, the lack of this conventional axis structure lies in:

Please refer to Figure 9 of the publication, the gap between the first cover 30 and the sealing member 50 is in the shape of a circuitous path, but there are only two gaps between the first cover 30 and the sealing member 50 The circuitous path formed between the components is relatively monotonous, and it is easy for various cutting fluids or cooling fluids to enter the interior of the spindle structure and cause damage.

In view of the lack of the above-mentioned conventional structure, the inventor has been engaged in the manufacture, production and design of related industries for many years, and finally a product with a spindle structure that can solve the conventional disadvantages comes out.

In the conventional spindle structure, the gap between the first cover and the sealing part is in the shape of a circuitous path, but only the circuitous path formed between the first cover and the sealing part More monotonous. In the main shaft structure of the present invention, the first gap is provided between the rotating shaft and the first cover, the second gap is provided between the rotating shaft and the second cover, and the first gap and the second cover are provided. The second gap is in the shape of a circuitous path, with the first gap and In the second gap, the probability of damage caused by the liquid or cutting fluid entering the main shaft structure through the two roundabout paths of the first gap and the second gap is greatly reduced, and the two roundabout paths are more complicated.

The present invention relates to a main shaft structure, which includes: a system is provided with a first container; a rotating shaft is pivotally arranged in the first container, and the rotating shaft is provided with a first fitting part and a first Two cover parts; a first cover system is pivoted with the rotation shaft, and the first cover system is provided with a third cover part for pivoting of the first cover part, and the third cover part is connected with the second cover part A circuitous path-like first gap is formed between the fitting parts; a second cover system is provided with a fourth fitting part to pivot with the second fitting part, the first fitting part and the second fitting part The two fitting parts are arranged between the third fitting part and the fourth fitting part, and a second gap is formed between the fourth fitting part and the second fitting part, and the second gap is In the form of a circuitous path, the second gap is connected to the first gap.

The first gap is provided between the rotating shaft and the first cover, the second gap is provided between the rotating shaft and the second cover, and the first gap and the second gap are circuitous. Path-shaped, with the first gap and the second gap, the probability of damage caused by the liquid or cutting fluid entering the main shaft structure through the two roundabout paths of the first gap and the second gap is greatly reduced. The first fitting part and the second fitting part are arranged between the third fitting part and the fourth fitting part, the first gap and the second gap are provided with at least two bends .

In order to make the committee members and those skilled in this art fully understand the effect of the present invention, the structure and composition of the present invention will be described below in conjunction with the drawings and figure numbers, but the following descriptions are only used to explain the implementation of the present invention example, it is not intended to limit the present invention in any form Any modifications made under the spirit of the present invention should still fall within the protection scope of the present invention.

10: Ontology

11: The first container

20: rotating shaft

21: The first joint

211: The first week

212: First ring groove

213: The first ring convex rib

214: first angle end

215: The second week

2151: The first holding tank

2152: The second holding tank

216: second ring groove

217: second ring convex rib

22: The second joint

221: The third week

2211: The third holding tank

222: The fourth storage tank

223: third ring convex rib

224: third ring groove

30: the first cover

31: The third joint

311: The fourth week

312: fourth ring convex rib

313: fourth ring groove

314: second angle end

315: The fifth week

316: fifth ring convex rib

3161: Fifth holding tank

317: first end face

40: Second cover

41: The fourth joint

411: Week 6

412: Week 7

413: fifth ring groove

414: Sixth ring convex rib

415: stomata

51: First gap

52:Second gap

Fig. 1 is the three-dimensional exploded view of the spindle structure of the present invention.

Fig. 2, is the side view of the rotating shaft of the main shaft structure of the present invention.

Fig. 3 is a cross-sectional view at A-A of Fig. 2 of the present invention.

Fig. 4 is a side view of the first cover of the spindle structure of the present invention.

Fig. 5 is a sectional view at B-B of Fig. 4 of the present invention.

Fig. 6 is a side view of the second cover of the spindle structure of the present invention.

Fig. 7 is a cross-sectional view at C-C of Fig. 6 of the present invention.

Fig. 8 is a three-dimensional combined view of the main shaft structure of the present invention.

Fig. 9 is a side view of the spindle structure of the present invention.

Fig. 10 is a sectional view at B-B of Fig. 9 of the present invention.

Fig. 11 is an enlarged view of D in Fig. 10 of the present invention.

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

Fig. 13 is a sectional view of the third embodiment of the present invention.

First please refer to Fig. 1 to Fig. 11, Fig. 1 is a three-dimensional exploded view of the main shaft structure of the present invention, Fig. 2 is a side view of the rotating shaft 20 of the main shaft structure of the present invention, and Fig. 3 is A-A of Fig. 2 of the present invention Fig. 4 is a side view of the first cover body 30 of the main shaft structure of the present invention, Fig. 5 is a sectional view of the B-B place of Fig. 4 of the present invention, Fig. 6 is a side view of the second cover body 40 of the main shaft structure of the present invention, Fig. 7 It is a cross-sectional view at C-C of Fig. 6 of the present invention. The present invention relates to a main shaft structure, which includes:

A main body 10, the main body 10 is assembled on various machine tools or various processing machine tools, the main body 10 is provided with a first container 11, the first container 11 runs through the main body 10, the first The holding tank 11 is in the shape of a circular tank;

A rotating shaft 20, please supplement as shown in Figure 2 and Figure 3, the rotating shaft 20 is pivotally arranged in the first container 11, the rotating shaft 20 is a fast rotation shape, the rotating shaft 20 and the first At least one set of bearings is provided between the tanks 11, and one end of the rotating shaft 20 is used for the assembly of various cutting tools. The rotating shaft 20 is provided with a first fitting part 21 and a second fitting part 22, The first fitting portion 21 and the second fitting portion 22 protrude outside the body 10;

The first fitting portion 21 is sequentially provided with a first peripheral surface 211, a first ring groove 212, a first ring rib 213, a first corner end 214, a second peripheral surface 215, a first Two ring grooves 216 and a second ring rib 217, the first peripheral surface 211 has an outer diameter, the first ring groove 212 is in the shape of a concave ring groove, and the first ring rib 213 is in the form of Convex ring shape, the first ring groove 212 and the first ring rib 213 and the first peripheral surface 211 are perpendicular or close to 90 degrees, the first ring groove 212 and the first ring groove 213 The first ring rib 213 is towards the main body 10, the first corner end 214 is curved, right angled, chamfered or rounded, and the diameter of the second peripheral surface 215 is larger than the first The diameter of the peripheral surface 211, the two sides of the second peripheral surface 215 are provided with a first accommodating groove 2151 and a second accommodating groove 2152, the first accommodating groove 2151 and the second accommodating groove 2152 have a relatively The large space buffers and accommodates various liquids. The liquid system can be cutting fluid or cooling fluid. The 216 series is in the shape of a concave ring groove, and the second ring The convex rib 217 is in the shape of a convex ring, the second ring groove 216 and the second ring rib 217 and the second peripheral surface 215 are perpendicular to or close to 90 degrees, the second ring The groove 216 and the second ring rib 217 are towards the body 10, the end surface of the second ring groove 216 is flat with the end surface of the first ring groove 212, and the second ring rib 217 The end surface of the ring is parallel to the end surface of the first annular rib 213;

The second fitting portion 22 is sequentially provided with a third peripheral surface 221, a fourth accommodating groove 222, a third ring rib 223 and a third ring groove 224, and the third peripheral surface 221 has a maximum Outer diameter, the outer diameter of the third peripheral surface 221 is greater than the outer diameter of the first peripheral surface 211, the diameter of the third peripheral surface 221 is greater than the diameter of the second peripheral surface 215, the third peripheral surface 221 Two third accommodating tanks 2211 are provided, and the third accommodating tank 2211 has a relatively large space to buffer and accommodate the liquid. The fourth accommodating groove 222 is arranged in the range of the third peripheral surface 221, and the fourth accommodating groove 222 has a large space to buffer and accommodate the liquid. The fourth accommodating groove 222 is arranged on the second Between the three accommodation grooves 2211, the fourth accommodation groove 222 is in the shape of a concave ring, the third ring rib 223 is in the shape of a convex ring, and the third ring groove 224 is in the shape of a concave ring. The shape between the third ring rib 223 and the third ring groove 224 and the third peripheral surface 221 is perpendicular or close to 90 degrees. The third ring rib 223 and the third ring groove The groove 224 is not facing the body 10;

A first cover 30, as shown in Fig. 4 and Fig. 5, the first cover 30 is assembled at the end of the main body 10, and the first cover 30 is pivotally arranged with the rotating shaft 20 , the first cover 30 is provided with a third fitting portion 31, the third fitting portion 31 is used for the pivoting of the first fitting portion 21, the third fitting portion 31 and the first fitting portion A first gap 51 is formed between the 21, the first gap 51 is in the shape of a circuitous path, and the section of the third fitting part 31 matches the section of the first fitting part 21 Together, the third fitting portion 31 runs through the first cover 30, the third fitting portion 31 is in the shape of a circular groove, and the first fitting portion 31 is sequentially provided with a fourth peripheral surface 311, a a fourth ring rib 312 , a fourth ring groove 313 , a second corner end 314 , a fifth peripheral surface 315 , a fifth ring rib 316 and the first end face 217 ;

The fourth peripheral surface 311 is pivoted to the first peripheral surface 211, the fourth annular rib 312 is accommodated in the first annular groove 212, and the fourth annular rib 312 is in the form of a convex ring. body shape, the fourth ring groove 313 is compatible with the first ring rib 213, the fourth ring groove 313 is in the shape of a concave ring groove, and the second corner end 314 is aligned with the first ring groove. The corner end 214, the second corner end 314 is in a right-angle shape, the fifth peripheral surface 31 is pivotally arranged with the second peripheral surface 215, and the fifth ring rib 316 is accommodated in the second ring groove 216, the fifth annular rib 316 is in the shape of a convex ring, the first end face 317 is opposite to the second annular rib 217, the first end face 317 is planar, and the first end face 317 There is a large space between the fifth ring rib 316 for temporary storage of the cutting fluid or coolant, etc., and a fifth receiving groove is provided between the fifth ring rib 316 and the first end surface 317 3161, the fifth accommodating groove 3161 is in the shape of a concave circular groove, and the fifth accommodating groove 3161 has a large space for temporarily storing the cutting fluid or cooling fluid;

A second cover 40, as shown in Figure 6 and Figure 7, the second cover 40 is assembled on the body 10, and the second cover 40 is located at the end of the first cover 30 The first cover 30 is set between the main body 10 and the second cover 40, the second cover 40 is provided with a fourth fitting part 41, and the fourth fitting part 41 is connected with the The second fitting portion 22 is pivotally arranged, the first fitting portion 21 and the second fitting portion 22 are arranged between the third fitting portion 31 and the fourth fitting portion 41, and the fourth fitting portion A second gap 52 is formed between the joint part 41 and the second fitting part 22. The second gap 52 is in the shape of a roundabout path or an L-shaped roundabout path. The second gap 52 is connected to the first gap 51. , the fourth fitting The cross section of 41 matches the cross section of the second fitting portion 22, the fourth fitting portion 41 runs through the second cover 40, the fourth fitting portion 41 is in the shape of a concave circular groove, and the fourth fitting portion 41 is in the shape of a concave circular groove. The sleeve part 41 is provided with a sixth peripheral surface 411, a seventh peripheral surface 412, a fifth ring groove 413, a sixth ring rib 414 and an air hole 415;

The sixth peripheral surface 411 is pivoted to the third peripheral surface 221, the inner diameter of the seventh peripheral surface 412 is larger than the inner diameter of the sixth peripheral surface 411, and the seventh peripheral surface 412 is connected to the fourth peripheral surface 412. The accommodating groove 222 is opposite to each other, and there is a large space between the seventh peripheral surface 412 and the fourth accommodating groove 222 for temporarily storing the cutting fluid or cooling fluid, etc., and the fifth ring groove 413 is for the The third ring rib 223 is accommodated, the fifth ring groove 413 is in the shape of a concave ring, the sixth ring rib 414 is accommodated in the third ring groove 224, and the air hole 415 is aligned On the seventh peripheral surface 412, the liquid or gas in the second gap 52 can be discharged from the main shaft structure through the air hole 415. The air hole 415 is in communication with the fourth fitting part 41. The air hole 415 is It is perforated, and the axis of the air hole 415 is perpendicular to the axis of the fourth fitting portion 41 .

Please refer to Fig. 8 to shown in Fig. 11, Fig. 8 is the three-dimensional assembly diagram of main shaft structure of the present invention, Fig. 9 is the side view of main shaft structure of the present invention, Fig. 10 is the sectional view of the B-B place of Fig. 9 of the present invention, Fig. 11 is this In the enlarged view of D in Figure 10, the first cover 30 and the second cover 40 are combined with the main body 10, and the second cover 40 is combined with the first cover 30. The rotating shaft 20 is pivotally arranged in the first cavity 11, the third fitting portion 31 and the fourth fitting portion 41, and the first fitting portion 21 and the third fitting portion 31 are connected to each other. The first gap 51 is provided, the second gap 52 is provided between the second fitting part 22 and the fourth fitting part 41, and the first gap 51 and the second gap 52 are in the shape of a circuitous path The first gap 51 and the second gap 52 greatly reduce the probability of the liquid entering the body 10, and the liquid or gas in the second gap 52 can be discharged from the main shaft through the air hole 415 outside the structure.

Please continue to refer to Fig. 12 and shown in Fig. 13, Fig. 12 is a cross-sectional view of the second embodiment of the present invention, Fig. 13 is a cross-sectional view of the third embodiment of the present invention, please compare it with Fig. 10, the transmission shaft 20 is assembled at the rear A different transmission assembly is provided, which drives the rotating shaft 20 to rotate rapidly.

The advantage of the spindle structure of the present invention is that:

1. The first gap 51 is provided between the rotating shaft 20 and the first cover 30, the second gap 52 is provided between the rotating shaft 20 and the second cover 40, and the first gap 51 and the second gap 52 are in the shape of a roundabout path, with the first gap 51 and the second gap 52, and the liquid enters the interior of the main shaft structure through the two roundabout paths of the first gap 51 and the second gap 52 The chance of causing damage is greatly reduced.

2. The first fitting portion 21 and the second fitting portion 22 are located between the third fitting portion 31 and the fourth fitting portion 41, so the first gap 51 and the second gap 52 The system has at least two bends.

3. A pivotal structure is tied between the rotating shaft 20 and the first cover 30, and a pivoting structure is tied between the rotating shaft 20 and the second cover 40. The first cover 30 and the second There is a relative relationship between the covers 40 , and there is a structural relationship between the rotating shaft 20 , the first cover 30 and the second cover 40 , that is, they have a better assembly structure.

4. Please refer to Figure 11, the first ring groove 212, the first ring rib 213, the second ring groove 216, the second ring rib 217, the third ring rib 223, The third ring groove 224, the fourth ring rib 312, the fourth ring groove 313, the fifth ring rib 316, the fifth ring groove 413 and the sixth ring rib 414 are With multiple bends, it is more difficult for the cutting fluid to enter the interior of the spindle structure.

5. Please refer to Figure 11, between the seventh peripheral surface 412 and the fourth accommodation groove 222, the third Between the accommodating groove 2211, the first end surface 317 and the second annular rib 217, the fifth accommodating groove 3161 and the second accommodating groove 2152 are a containing space for temporarily storing the liquid entering from the outside Or the cutting fluid may slow down the speed of its entry, and the liquid or the cutting fluid will increase the difficulty of entering the interior of the main shaft structure.

6. The rotating shaft 20 can rotate quickly, the second fitting part 22 is provided with the two third accommodation grooves 2211 and the fourth accommodation groove 222, and the cross section of the third accommodation groove 2211 is triangular Groove shape, after contacting the third peripheral surface 221, each liquid will be subjected to the inclination and the centrifugal force of rapid rotation in the third accommodating groove 2211, so that the liquid is thrown away or flows to the fourth accommodating groove 222 and At the seventh peripheral surface 412 , the probability of the liquids entering the main shaft structure from the gap between the rotating shaft 20 and the second cover 40 is greatly reduced.

7. With the air hole 415, the excess liquid or gas entering the fourth receiving groove 222 and the seventh peripheral surface 412 can be discharged out of the main shaft structure through the air hole 415, and the probability of damage to the main shaft structure is reduced.

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

10: Ontology

11: The first container

20: rotating shaft

21: The first joint

22: The second joint

30: the first cover

31: The third joint

40: Second cover

41: The fourth joint

Claims (10)

A spindle structure comprising: a body, the body is provided with a first container; A rotating shaft, the rotating shaft is pivotally arranged in the first container, and the rotating shaft is provided with a first fitting part and a second fitting part; A first cover body, the first cover system is assembled on the end of the body, the first cover system is pivoted to the rotation shaft, the first cover system is provided with a third fitting part, and the third cover system The joint part is used for the pivoting of the first sleeve part, and a first gap is formed between the third sleeve part and the first sleeve part, and the first gap is in the shape of a circuitous path; A second cover, the second cover is assembled on the main body, the second cover is arranged at the end of the first cover, the first cover is arranged between the main body and the second cover Between, the second cover system is provided with a fourth fitting part, the fourth fitting part is pivoted with the second fitting part, the first fitting part and the second fitting part are arranged on the Between the third fitting part and the fourth fitting part, a second gap is formed between the fourth fitting part and the second fitting part, and the second gap is in the shape of a circuitous path. The gap is connected to the first gap. The main shaft structure as described in Claim 1, wherein the main body is assembled on various machine tools or various processing machine tools, the first storage slot runs through the main body, and the first storage slot is in the shape of a circular slot; The rotating shaft system is in a fast-rotating shape. At least one set of bearings is arranged between the rotating shaft and the first container. One end of the rotating shaft is used to assemble various tools. The second fitting part protrudes outside the body. The main shaft structure according to claim 1, wherein, the first fitting part is sequentially provided with a first peripheral surface, a first ring groove, a first ring rib, a first corner end, a first two weeks surface, a second ring groove and a second ring rib, the first peripheral surface has an outer diameter, and the diameter of the second peripheral surface is greater than the diameter of the first peripheral surface. The main shaft structure according to claim 3, wherein, the first ring groove is in the shape of a concave ring groove, the first ring convex rib is in the shape of a convex ring, the first ring groove and the first The ring rib and the first peripheral surface are perpendicular or close to 90 degrees, the first ring groove and the first ring rib are facing the body, and the first corner end is curved , right-angled, chamfered or rounded, the two sides of the second peripheral surface are provided with a first accommodating groove and a second accommodating groove, the first accommodating groove and the second accommodating groove The groove has a large space to buffer and accommodate various liquids. The liquid system can be cutting fluid or cooling fluid. The groove is in the shape of a concave ring groove, the second ring rib is in the shape of a convex ring, and the second ring groove and the second ring rib are perpendicular to the second peripheral surface or Close to 90 degrees, the second ring groove and the second ring rib are facing the body, the end surface of the second ring groove is flat with the end surface of the first ring groove, the second The end surface of the ring convex rib is parallel to the end surface of the first ring convex rib. The main shaft structure according to claim 3, wherein the second fitting part is provided with a third peripheral surface, a fourth receiving groove, a third ring rib and a third ring groove in sequence, the The third peripheral surface has a maximum outer diameter, the outer diameter of the third peripheral surface is larger than the outer diameter of the first peripheral surface, the diameter of the third peripheral surface is larger than the diameter of the second peripheral surface, and the fourth container The storage groove is arranged within the range of the third peripheral surface, and the fourth accommodating groove has a large space for buffering and accommodating the liquid. The main shaft structure as described in Claim 5, wherein, the third peripheral surface is provided with two third accommodation grooves, and the third accommodation grooves have a larger space to buffer and accommodate the liquid, and the third accommodation The cross section of the groove is slightly triangular groove shape or each groove shape, the fourth containing groove is arranged between the two third containing grooves, the fourth containing groove is in the shape of a concave ring groove, the third ring The convex rib is in the shape of a convex ring, the third ring groove is in the shape of a concave ring, and the third ring convex rib and the third ring groove are perpendicular to the third peripheral surface. Or close to 90-degree shape, the third ring rib and the third ring groove are not facing the body. The main shaft structure as described in claim 5, wherein, the cross section of the third fitting part matches the cross section of the first fitting part, the third fitting part passes through the first cover, and the third fitting part The fitting part is in the shape of a circular groove, and the first fitting part is sequentially provided with a fourth peripheral surface, a fourth ring rib, a fourth ring groove, a second corner end, and a fifth peripheral surface 1. A fifth ring convex rib and the first end surface; the fourth peripheral surface is pivoted with the first peripheral surface, the fourth ring convex rib is accommodated in the first ring groove, the fourth ring The groove is compatible with the first ring rib, the second corner end is aligned with the first corner end, the fifth peripheral surface is pivoted with the second peripheral surface, and the fifth ring rib is It is accommodated in the groove of the second ring, and the first end surface is opposite to the convex rib of the second ring. The main shaft structure as described in Claim 7, wherein the fourth ring convex rib is in the shape of a convex ring, the fourth ring groove is in the shape of a concave ring groove, and the second corner end is in the shape of a right angle, The fifth ring convex rib is in the form of a convex ring, the first end surface is flat, and there is a large space between the first end surface and the fifth ring convex rib for temporary storage of the cutting fluid or cooling fluid etc., a fifth accommodating groove is arranged between the fifth annular convex rib and the first end surface, the fifth accommodating groove is in the shape of a concave ring groove, and the fifth accommodating groove has a relatively large space for For temporary storage of the cutting fluid or coolant, etc. The main shaft structure as described in claim 7, wherein, the cross section of the fourth fitting part matches the cross section of the second fitting part, the fourth fitting part penetrates the second cover, and the first fitting part The four fitting parts are in the shape of concave circular grooves, and the fourth fitting part is provided with a sixth peripheral surface, a seventh peripheral surface, a fifth ring groove, a sixth ring convex rib and an air hole; The six peripheral surfaces are pivotally arranged with the third peripheral surface, the inner diameter of the seventh peripheral surface is larger than the inner diameter of the sixth peripheral surface, the seventh peripheral surface is opposite to the fourth accommodating groove, and the seventh peripheral surface is opposite to the fourth accommodating groove. There is a relatively large space between the seventh peripheral surface and the fourth accommodating groove for temporary storage of the cutting fluid or cooling fluid, etc., the fifth ring groove is for the third ring rib to be accommodated, and the sixth ring The convex rib is accommodated in the third ring groove, the air hole is aligned with the seventh peripheral surface, the liquid or gas in the second gap can be discharged from the main shaft structure through the air hole, and the air hole and the The fourth cover part is in the same shape. The main shaft structure as described in Claim 9, wherein, the fifth ring groove is in the shape of a concave ring, the air hole is in the shape of a perforation, and the axis of the air hole is aligned with the axis of the fourth fitting part. vertical.

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