TW202243790A - Spindle structure including a body, a rotary shaft, a first bearing set, a second bearing set, and a rear lock assembly - Google Patents

Abstract

This invention relates to a spindle structure, including a body provided with a first receiving groove and a first accommodating groove; a rotary shaft provided with a fourth circumferential surface, a first screwing portion, a third butting flange, a fifth circumferential surface, a second screwing portion, and a fourth butting flange; a first bearing set provided with a plurality of first bearings and a first precision nut, wherein the plurality of first bearings are sleeved onto the fourth circumferential surface, and the first precision nut is screwed and locked with the first screwing portion, such that the plurality of first bearings are assembled on the fourth circumferential surface; a second bearing set assembled with the body and the rotary shaft, wherein the second bearing set is provided with a plurality of second bearings, the plurality of second bearings are sleeved onto the fifth circumferential surface; and a rear lock assembly assembled with the body and the rotary shaft, wherein the rear lock assembly is assembled with the second bearing set.

Description

Spindle structure

The present invention relates to a main shaft structure, especially a main shaft structure, the first precision nut sets the plurality of first bearings on the rotating shaft, and the rotating shaft and the first bearing set are arranged on the rotating shaft The main body can avoid slippage between the first bearing and the rotating shaft, and the first bearing and the main body can be nested more smoothly.

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. The first abutting surface 52 is opposite to the first abutting edge 23 and the second abutting edge 32 , or the first abutting surface 52 is aligned with the first abutting edge 23 of the rotating shaft 20 and the first cover 30 The second abutting edge 32 abuts against each other, and the sealing member 50 A first end face 57 is provided at the end face of the shaft; at least one second cover 70 is fixed at the end of the rotating shaft 20, and the sealing member 50 and the second cover 70 It is combined with the rotating shaft 20 and rotates quickly with the rotating shaft 20. The second cover 70 is provided with a fourth abutting surface 71, and the fourth abutting surface 71 is connected with the first end surface of the sealing member 50. 57 is opposite to each other, 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 member 50 is restricted by the second cover 70 And can't be thrown off mutually with this rotating shaft 20.

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

Please refer to Figure 8 of the Taiwan Gazette, the rotating shaft 20 is pivotally installed in the main body 10 and rotates quickly. Structurally, there must be multiple bearings between the rotating shaft 20 and the main body 10, but when assembling, the The bearing system is prone to slippage uncertainty, that is, during assembly, there will be relative slippage between the rotating shaft 20 and the bearing, and there will be relative slippage between the body 10 and the bearing. Both of them will have relative slippage, and there are two variables of slippage. After assembly, the position of the bearing may be in an uncertain state.

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, there will be relative slippage between the rotating shaft and the bearing, and there will be relative slippage between the body and the bearing. Each of the three will have relative slippage. There are two variables, and the position of the bearing may be uncertain after assembly. In the main shaft structure of the present invention, the first precision nut sets the plurality of first bearings on the rotating shaft, and when the rotating shaft and the first bearings are arranged on the body, the second When a sliding phenomenon occurs between a bearing and the rotating shaft, the first bearing and the body can be sleeved more smoothly.

A main shaft structure, which includes: a system with a first accommodation groove and a first accommodation groove; a rotating shaft system with a fourth peripheral surface, a first screw joint, a third abutting edge, a The fifth peripheral surface, a second threaded portion and a fourth abutting edge; a first bearing group is provided with a plurality of first bearings and a first precision nut; the plurality of first bearings are sleeved on the fourth On the peripheral surface; the first precision nut is screwed and locked with the first threaded part, so that the plurality of first bearings are assembled on the fourth peripheral surface; a second bearing assembly is connected to the body and the rotating shaft, the second bearing group is provided with a plurality of second bearings; the plurality of second bearings are sleeved on the fifth peripheral surface; a rear lock group is connected with the body and the rotating shaft Assembled, the rear lock group is assembled with the second bearing group.

The first precision nut sets the plurality of first bearing groups on the rotating shaft, and when the rotating shaft and the first bearing group are arranged on the body, it can avoid slippage between the first bearing and the rotating shaft Without the phenomenon of shifting, the first bearing and the body can be nested more smoothly. The second bearing set can be assembled to a certain position through the locking of the rear lock set, avoiding slipping between the second bearing set and the rotating shaft, and has a better assembly structure. The first bearing has the first precision nut and its position is assembled, the second bearing has the rear lock group and is assembled at a fixed position, the first precision nut and the rear lock group have their own assembly functions and have more Good set up structure.

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

111: The first week

112: The second week

113: The third week

114: The First Arrival

115: Second Arrival

116: The first storage tank

117: The first screw hole

20: rotating shaft

21: The fourth week

22: The first thread joint

23: The Third Arrival

24: The fifth week

25: The second threaded part

26: The Fourth Arrival

27: Week 6

30: The first bearing group

31: First bearing

32: The first precision nut

33: First washer

40: The second bearing group

41:Second bearing

42:Second washer

50: rear lock group

51: First labyrinth ring

511: The first retaining edge

52: Second labyrinth ring

53:Second Precision Nut

54: screw parts

55: First gap

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

Fig. 2 is a side view of the main shaft structure body 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 three-dimensional exploded view of the first bearing group of the main shaft structure of the present invention.

Fig. 5 is a three-dimensional exploded view of the second bearing group of the main shaft structure of the present invention.

Fig. 6 is a three-dimensional exploded view of the rear lock group of the main shaft structure of the present invention.

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

Fig. 8 is a side view of the first operating state of the spindle structure of the present invention.

Fig. 9 is a sectional view at B-B of Fig. 8 of the present invention.

Fig. 10 is a cross-sectional view of the second operating state of the spindle structure of the present invention.

Fig. 11 is a cross-sectional view of the third operating state of the spindle structure of the present invention.

Fig. 12 is an enlarged view of D in Fig. 11 of the present invention.

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

Fig. 14 is a sectional view of the third embodiment of the present invention.

First please refer to Fig. 1 to Fig. 6 and Fig. 12, 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 main shaft structure body 10 of the present invention, and Fig. 3 is A-A of Fig. 2 of the present invention The sectional view of place, Fig. 4 is the three-dimensional exploded view of the first bearing group 30 of the main shaft structure of the present invention, Fig. 5 is the three-dimensional exploded view of the second bearing group 40 of the main shaft structure of the present invention, Fig. 6 is the rear lock group 50 of the main shaft structure of the present invention Three-dimensional exploded view, Fig. 12 is an enlarged view of D in Fig. 11 of the present invention. The present invention relates to a main shaft structure, which includes:

A body 10, as shown in Fig. 3, the body 10 is assembled on various machine tools or various processing machines, the body 10 is provided with a first container 11, and the first container 11 is Through the body 10, the first container 11 is in the shape of a circular groove, and the first container 11 is provided with a first peripheral surface 111, a second peripheral surface 112 and a third peripheral surface 113. The first The peripheral surface 111 is arranged at the opening of one end of the first container 11, the third peripheral surface 113 is arranged between the first peripheral surface 111 and the second peripheral surface 112, and the diameter of the first peripheral surface 111 is It is smaller than the diameter of the third peripheral surface 113, so that the first accommodating groove 11 is provided with a first abutting edge 114, the first abutting edge 114 is planar, and the diameter of the third peripheral surface 113 is larger than the diameter of the third peripheral surface 113. The diameter of the second peripheral surface 112 is such that a second abutting edge 115 is arranged in the first containing groove 11, and the second abutting edge 115 is flat, and the body 10 is provided with a first containing groove 116. The first accommodating groove 116 is connected to the first accommodating groove 11, and the first accommodating groove 116 is in the shape of a circular groove. The first accommodating groove 116 is located near the second peripheral surface 112, The diameter of the first accommodating groove 116 is greater than the diameter of the second peripheral surface 112, the first accommodating groove 116 has a maximum diameter, and the first accommodating groove 116 is provided with a plurality of first screw holes 117. The plurality of first screw holes 117 are arranged in a ring at intervals with the axis center of the first accommodation groove 116, the number of the plurality of first screw holes 117 is 6, and the first screw holes 117 are perforated;

A rotating shaft 20, the rotating shaft 20 is pivotally arranged in the first container 11, and the rotating shaft 20 is fast rotating relative to the body 10, and one end of the rotating shaft 20 is provided for various cutters to be assembled together. Both ends of the rotating shaft 20 protrude from the body 10, and the rotating shaft 20 is provided with a fourth peripheral surface 21. The fourth peripheral surface 21 is opposite to the first peripheral surface 111. The rotating shaft 20 is provided with a first threaded portion 22. The first threaded portion 22 is in the shape of an external thread. The first threaded portion The maximum diameter of the joint part 22 is smaller than the outer diameter of the fourth peripheral surface 21, so that a third abutting edge 23 is arranged between the first screwing part 22 and the fourth peripheral surface 21, and the third abutting edge 23 is In a planar shape, the rotating shaft 20 is provided with a fifth peripheral surface 24, the fifth peripheral surface 24 is far away from the fourth peripheral surface 21, and the fifth peripheral surface 24 is opposite to the second peripheral surface 112. One end of the rotating shaft 20 is provided with a second threaded portion 25, the second threaded portion 25 is in the shape of an external thread, the rotating shaft 20 is provided with a fourth abutting edge 26, and the fifth peripheral surface 24 is provided with Between the fourth abutting edge 26 and the second threaded portion 25, the fourth abutting edge 26 is planar, and the rotating shaft 20 is provided with a sixth peripheral surface 27, which is in line with the sixth peripheral surface 27. The third peripheral surface 113 is opposite, and the rotating shaft 20 is sequentially provided with the fourth peripheral surface 21, the third abutting edge 23, the first threaded portion 22, the sixth peripheral surface 27, the fourth The diameter of the fourth peripheral surface 21 is larger than the diameter of the sixth peripheral surface 27, and the diameter of the sixth peripheral surface 27 is larger than the diameter of the sixth peripheral surface 27. The diameter of the five peripheral surfaces 24;

A first bearing group 30, as shown in Fig. 4, the first bearing group 30 is assembled with the body 10 and the rotating shaft 20, and the first bearing group 30 is arranged between the body 10 and the rotating shaft Between the shafts 20, the first bearing group 30 is provided with a plurality of first bearings 31, a first precision nut 32 and a first washer 33;

The plurality of first bearings 31 are sleeved on the fourth peripheral surface 21, the plurality of first bearings 31 are arranged between the first peripheral surface 111 and the fourth peripheral surface 21, one end of the plurality of first bearings 31 It is attached to one end surface of the rotating shaft 20, and the other end of the plurality of first bearings 31 is attached to the first abutting edge 114, so that the plurality of first bearings 31 cannot be displaced on the first peripheral surface 111. The quantity of the first bearing 31 is 3;

The first precision nut 32 is screwed and locked with the first threaded part 22, so that the plurality of first bearings 31 are assembled on the fourth peripheral surface 21 and cannot be displaced. 32 rotates with the rotating shaft 20, and the first precision nut 32 abuts or does not abut against the third abutting edge 23;

The first washer 33 fits on the fourth peripheral surface 21, the first washer 33 is arranged between the plurality of first bearings 31 and the first precision nut 32, and the first washer 33 is attached to the first precision nut 32. The rotating shaft 20 rotates;

The first precision nut 32 is pressed against the first washer 33 and the inner ring of the plurality of first bearings 31, so that the first washer 33, the first precision nut 32, and the inner ring of the plurality of first bearings 31 As the rotating shaft 20 rotates, the inner rings of the plurality of first bearings 31 and the rotating shaft 20 are tightly fitted;

A second bearing group 40, please supplement as shown in Figure 5, the second bearing group 40 is assembled with the body 10 and the rotating shaft 20, and the second bearing group 40 is arranged between the body 10 and the rotating shaft Between the shafts 20, the second bearing set 40 and the first bearing set 30 are arranged at opposite ends of the rotating shaft 20, and there is a gap between the second bearing set 40 and the first bearing set 30, the The second bearing set 40 is provided with a plurality of second bearings 41 and a second washer 42;

The plurality of second bearings 41 are sleeved on the fifth peripheral surface 24, the plurality of second bearings 41 are arranged between the second peripheral surface 112 and the fifth peripheral surface 24, the number of the plurality of second bearings 41 Department is 2;

The second washer 42 is sleeved on the fifth peripheral surface 24, the second washer 42 is abutted between the fourth abutting edge 26 and the inner rings of the plurality of second bearings 41, the second washer 42 is Rotate with the rotating shaft 20;

A rear lock group 50, please supplement as shown in Figure 6, the rear lock group 50 is combined with the body 10 and the rotating shaft 20, the rear lock group 50 is assembled with the second bearing group 40, the rear The lock group 50 is partly accommodated in the first accommodating groove 116, and the rear lock group 50 is provided with a first labyrinth ring 51, a second labyrinth ring 52, a second precision nut 53 and multiple screw joints. piece 54;

The first labyrinth ring 51 is partially assembled at the first accommodation groove 116, and a first retaining edge 511 is arranged inside the first labyrinth ring 51, and the section of the first retaining edge 511 is slightly stepped. Shape, the first retaining edge 511 is a plane with a plurality of different heights, the plurality of different planes are parallel, the first retaining edge 511 is facing the opening of the first accommodation groove 116, the first labyrinth ring 51 is provided with a plurality of second screw holes 512, and the plurality of second screw holes 512 are arranged in a ring at intervals with the axis center of the first labyrinth ring 51, and each second screw hole 512 is connected with each first screw hole. The holes 117 are relatively positive, the number of the second screw holes 512 matches the number of the first screw holes 117, and the second screw holes 512 are perforated;

The second labyrinth ring 52 is sleeved on the fifth peripheral surface 54, the second labyrinth ring 52 is opposite to the first labyrinth ring 51, and one end of the second labyrinth ring 52 is against the plurality of second bearings 41 inner circle;

As shown in Figure 12, there is a first gap 55 between the first retaining edge 511 of the first labyrinth ring 51 and the second labyrinth ring 52, and the first gap 55 is in the shape of a circuitous path. The first gap 55 can reduce the probability of various liquids or cutting fluids entering the interior of the main shaft structure from the rear lock group 50;

The second precision nut 53 is screwed and locked with the second threaded part 25, so that the second bearing group 40 is assembled on the fifth peripheral surface 24 and the first labyrinth ring 51 and the second The second labyrinth ring 52 does not escape from the body 10, the second precision nut 53 rotates with the rotation shaft 20, and the second precision The nut 53 is pressed against the second labyrinth ring 52, the inner ring of the second bearing 41 and the second washer 42, so that the second labyrinth ring 52, the inner ring of the second bearing 41 and the second washer 42 Rotate with the rotating shaft 20, so that the second labyrinth ring 52, the inner ring of the second bearing 41 and the second washer 42 are tightly fitted with the rotating shaft 20;

The plurality of screw fittings 54 are passed through the second screw hole 512, and the plurality of screw fittings are screwed into the plurality of first screw holes 117, so that the first labyrinth ring 51 is assembled with the body 10, The quantity of the screw fittings 54 matches the quantity of the first screw holes 117, and the screw fittings 54 are in the shape of external threads.

Please continue to refer to FIG. 7, which is a perspective view of the main shaft structure of the present invention. The rotating shaft 20 is pivotally mounted in the first groove 11 and rotates quickly. The first bearing set 30 and the second bearing set 40 are Set between the body 10 and the rotating shaft 20, the first bearing set 30 is far away from the second bearing set 40, the rear lock set 50 is accommodated in the first receiving groove 116, the The first gap 55 is provided between the first labyrinth ring 52 and the first labyrinth ring 51 , and the first gap 55 is in the shape of a circuitous path.

Please refer to Fig. 8 to shown in Fig. 11, Fig. 8 is the side view of the first operating state of the main shaft structure of the present invention, Fig. 9 is the sectional view of the B-B place of Fig. 8 of the present invention, Fig. 10 is the second operating state of the main shaft structure of the present invention Sectional view, Fig. 11 is the sectional view of the third operating state of the main shaft structure of the present invention. First, the first bearing group 30 is fitted on the rotating shaft 20, and the first precision nut 31 is screwed and locked on the first nut. The joint part 22, and then the rotating shaft 20 and the first bearing group 30 are accommodated in the body 10 as shown in Figure 9, and then the second bearing group 40 is fitted on the fifth peripheral surface 24 as shown in FIG. As shown in Figure 10, the first labyrinth ring 51 is housed in the first accommodating groove 116, the second labyrinth ring 52 fits on the fifth peripheral surface 24, and the second precision The nut 53 is screwed and locked on the second screwed part 25 as shown in Fig. 11 shown.

Please continue to refer to Fig. 13 and shown in Fig. 14, Fig. 13 is a cross-sectional view of the second embodiment of the present invention, Fig. 14 is a cross-sectional view of the third embodiment of the present invention, please compare it with Fig. 11, the rear part of the drive shaft 20 is A different transmission assembly is assembled, and the transmission assembly is used to drive the rotating shaft 20 to rotate quickly.

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

1. The first precision nut 32 is to set the plurality of first bearings 31 on the rotating shaft 20. When the rotating shaft 20 and the first bearing set 30 are set on the body 10, the first bearing 31 can be avoided. The sliding phenomenon occurs between the bearing 31 and the rotating shaft 20 , and the sleeve between the first bearing 31 and the body 10 can be more smoothly.

2. When the rotating shaft 20 and the first bearing group 30 are assembled in the first cavity 11, the plurality of first bearings 31 are pressed against the first abutting edge 114, and the rotating shaft 20 and the first bearing group A bearing set 30 can be assembled in the main body 10 and its position can be determined. When assembled, it has a fool-proof design and has a better assembly structure.

3. The second washer 42, the inner ring of the second bearing 41 and the second labyrinth ring 52 rotate with the rotating shaft 20, and the second precision nut 53 makes the second washer 42 lean against the At the fourth abutting edge 26, the second bearing set 40 can be assembled to a certain position through the locking of the second precision nut 53 to avoid slippage between the second bearing set 40 and the rotating shaft 20 phenomenon, and has a better organizational structure.

4. The first bearing 31 has the first precision nut 32 and its position is assembled, the second bearing 41 has the second precision nut 53 and is assembled at a certain position, the first precision nut 32 and the first precision nut 53 The two precision nuts 53 are located at the two ends of the body 10 and the rotating shaft 20 and have respective assembly functions and better assembly structures.

5. The two ends of the rotating shaft 20 are respectively provided with the first bearing 31 and the second bearing 41. There is a better pivotal structure between the body 10 and the rotating shaft 20. The two ends of the rotating shaft 20 are Be supportive.

6. The rear lock group 50 is assembled with the second bearing group 40, and there is a first gap 55 between the first labyrinth ring 51 and the second labyrinth ring 52, and the first gap 55 is in the shape of a circuitous path Therefore, the probability of cutting fluid entering the main shaft structure through the detour path of the first gap 55 and causing damage is greatly 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 fourth week

22: The first thread joint

23: The Third Arrival

24: The fifth week

25: The second threaded part

26: The Fourth Arrival

27: Week 6

30: The first bearing group

40: The second bearing group

50: rear lock group

Claims (7)

A spindle structure comprising: A body, the body is provided with a first storage tank, the first storage tank runs through the body, the body system is provided with a first storage tank, and the first storage tank is in communication with the first storage tank shape; A rotating shaft, the rotating shaft is pivotally arranged in the first container, the rotating shaft is provided with a fourth peripheral surface, the rotating shaft is provided with a first threaded part, and the first threaded part is an outer Thread shape, the maximum diameter of the first threaded part is smaller than the outer diameter of the fourth peripheral surface, so that a third abutting edge is provided between the first threaded part and the fourth peripheral surface, and the rotation shaft is set There is a fifth peripheral surface, the fifth peripheral surface is far away from the fourth peripheral surface, a second threaded part is provided at one end of the rotating shaft, the second threaded part is in the shape of an external thread, and the rotating shaft is provided with a fourth abutting edge, the fifth peripheral surface is arranged between the fourth abutting edge and the second threaded portion; A first bearing group, the first bearing group is assembled with the body and the rotating shaft, the first bearing group is arranged between the body and the rotating shaft, the first bearing group is provided with a plurality of A bearing, a first precision nut and a first washer; The plurality of first bearings are sleeved on the fourth peripheral surface, the plurality of first bearings are arranged between the first cavity and the fourth peripheral surface, and one end of the plurality of first bearings is against the rotating shaft one end face; The first precision nut is screwed and locked with the first threaded part, so that the plurality of first bearings are assembled on the fourth peripheral surface and cannot be displaced, and the first precision nut is rotated with the When the axis rotates, the first precision nut is abutted or not abutted against the third abutting edge; The first washer fits on the fourth peripheral surface, the first washer is arranged between the plurality of first bearings and the first precision nut, and the first washer rotates with the rotating shaft; A second bearing group, the second bearing group is assembled with the body and the rotating shaft, the second bearing group is arranged between the body and the rotating shaft, the second bearing group is connected with the first bearing The sets are arranged at opposite ends of the rotating shaft, and there is a gap between the second bearing set and the first bearing set; A rear lock group, the rear lock group is assembled with the body and the rotating shaft, and the rear lock group is assembled with the second bearing group. 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 container is in the shape of a circular groove, and a first container is arranged in the first container. A peripheral surface, a second peripheral surface and a third peripheral surface, the first peripheral surface is arranged at the opening at one end of the first container, the third peripheral surface is arranged between the first peripheral surface and the second peripheral surface Between the two peripheral surfaces, the diameter of the first peripheral surface is smaller than the diameter of the third peripheral surface, so that a first abutting edge is arranged in the first container, the first abutting edge is flat, and the second abutting edge is flat. The diameters of the three peripheral surfaces are larger than the diameter of the second peripheral surface, so that a second abutting edge is arranged in the first container, and the second abutting edge is planar. The main shaft structure according to claim 2, wherein the first accommodation groove is in the shape of a circular groove, the first accommodation groove is arranged near the second peripheral surface, and the diameter of the first accommodation groove is Greater than the diameter of the second peripheral surface, the first storage tank has the largest diameter, and the first storage tank is provided with a plurality of first screw holes, and the plurality of first screw holes are connected to the first storage tank. The axes are arranged in a ring at intervals, and the number of the plurality of first screw holes is six. The main shaft structure as described in Claim 2, wherein, the rotating shaft is in a fast-rotating shape relative to the main body, one end of the rotating shaft is used for the assembly of various tools, and the two ends of the rotating shaft are protruded outside the main body, The fourth peripheral surface is opposite to the first peripheral surface, and the third abutting edge is Planar, the fifth peripheral surface is opposite to the second peripheral surface, the rotation axis is provided with a sixth peripheral surface, the sixth peripheral surface is opposite to the third peripheral surface, and the rotation axis is sequentially The fourth peripheral surface, the third abutting edge, the first threaded portion, the sixth peripheral surface, the fourth abutting edge, the fifth peripheral surface and the second threaded portion are provided, and the fourth peripheral surface The diameter of the surface is larger than the diameter of the sixth peripheral surface, and the diameter of the sixth peripheral surface is larger than the diameter of the fifth peripheral surface. The main shaft structure according to claim 2, wherein the plurality of first bearings are arranged between the first peripheral surface and the fourth peripheral surface, and the other ends of the plurality of first bearings are abutted against the first abutting edge , so that the plurality of first bearings cannot be displaced on the first peripheral surface, and the number of the plurality of first bearings is three. The main shaft structure as described in claim 3, wherein, the second bearing group is provided with a plurality of second bearings and a second washer; the plurality of second bearings are sleeved on the fifth peripheral surface, and the plurality of second The bearing is arranged between the second peripheral surface and the fifth peripheral surface, and the number of the plurality of second bearings is 2; the second washer is sleeved on the fifth peripheral surface, and the second washer is against the fifth peripheral surface. Between the fourth abutting edge and the inner rings of the plurality of second bearings, the second washer rotates with the rotating shaft. The main shaft structure as described in claim 6, wherein, the rear lock group is partially accommodated in the first accommodating groove, and the rear lock group is provided with a first labyrinth ring, a second labyrinth ring, a first Two precision nuts and a plurality of screw fittings; the first labyrinth ring is partially assembled at the first accommodation groove, and a first retaining edge is arranged inside the first labyrinth ring, and the break of the first retaining edge The surface is slightly stepped, the first retaining edge has a plurality of planes with different heights, and the plurality of different planes are parallel, the first retaining edge faces the opening of the first accommodation tank, the first The labyrinth ring is provided with a plurality of second screw holes, and the plurality of second screw holes is formed by the axis of the first labyrinth ring. Arranged in a ring at intervals, each second screw hole is opposite to each first screw hole, the number of the second screw hole matches the number of the first screw hole, and the second screw hole is a through hole shape; the second labyrinth ring is sleeved on the fifth peripheral surface, the second labyrinth ring is opposite to the first labyrinth ring, and one end of the second labyrinth ring is against the inner ring of the plurality of second bearings There is a first gap between the first edge of the first labyrinth ring and the second labyrinth ring, the first gap is in the shape of a circuitous path, and the first gap can reduce the flow of various liquids or cutting fluids. The probability that the rear lock group enters the interior of the main shaft structure; the second precision nut is screwed and locked with the second threaded part, so that the second bearing group is assembled on the fifth peripheral surface and the The first labyrinth ring and the second labyrinth ring do not come out of the body, the second precision nut rotates with the rotating shaft, and the second precision nut is pressed against the second labyrinth ring and the second bearing. The inner ring and the second washer make the second labyrinth ring, the inner ring of the second bearing and the second washer rotate with the rotating shaft, so that the second labyrinth ring, the inner ring of the second bearing and the second washer The second washer is in a tight fit shape with the rotating shaft; the plurality of screw fittings are passed through the second screw holes, and the plurality of screw fittings are screwed into the plurality of first screw holes, so that the first labyrinth ring Assembled with the main body, the number of the screw fittings matches the number of the first screw holes, and the screw fittings are in the shape of external threads.

Images