TWI759117B - Spindle structure - Google Patents

Abstract

The invention relates to a main shaft structure, which comprises: a system is provided with a first accommodating groove, a ring convex rib, a first end surface and a ring groove; a rotating shaft is provided with a second screwing part and a first peripheral surface; a precision nut is provided with a second end surface; a rear cover and the precision nut have a first gap, the first gap is in the shape of an L-shaped circuitous path, and the rear cover is provided with a first set of A joint portion, a second accommodating groove, a third end face and a fourth end face; the sealing member is recessed with a second fitting portion, and the second fitting portion is compatible with the first fitting portion , a second gap is set between the second sleeve part and the first sleeve part, the second gap is connected with the first gap, and the second gap is in the shape of a U-shaped circuitous path; the second sleeve The joint part is provided with a protruding part.

Description

Spindle structure

The present invention is related to a main shaft structure, especially in a main shaft structure, the first gap is formed between the back cover and the precision nut, the first gap is in the shape of an L-shaped circuitous path, and the first sleeve fits The second gap is set between the second gap and the second sleeve, and the second gap is in the shape of a U-shaped circuitous path. The probability of the liquid entering the interior of the main shaft structure through the second gap and the first gap is reduce.

According to our previous knowledge, this is also the previous case of the patent we applied for, the conventional spindle structure, such as Taiwan patent case number: 107110781, certificate number: I647034, mainland application number: 201810386354.2, patent name: spindle structure, the patent The structure of the case is as follows: a first body 10, the first body 10 is assembled on various machine tools or various machining mother machines, one end of the first body is provided with a first end face 100, and the first body system A first accommodating groove 11 is provided, the first accommodating groove 11 is in the shape of a through groove, the first end face 10 is provided with a first fitting portion 12; a rotating shaft 20 is pivoted on the In the first accommodating groove 11 of the first body 10 , the rotating shaft 20 rotates rapidly in the first accommodating groove 11 , and one end of the rotating shaft 20 is provided with a first screwing portion 21 . The first screwing portion 21 is in the shape of an external thread; a first precision nut set 40 is screwed to the first screwing portion 21, and the first precision nut set 40 includes a first precision nut set 40. Precision nut 41; the first precision nut 41 is provided with a second end surface 410, the second end surface 410 is opposite to the first end surface 100, and there is a small gap between the second end surface 410 and the first end surface 410 clearance, the first precision nut 41 is set There is a second screwing part 411, the second screwing part 411 is for the first screwing part 21 to penetrate and screw with each other, the second screwing part 411 is in the shape of an internal thread, the second end surface 410 A second fitting portion 412 is provided at the tie ring, and the second fitting portion 412 is fitted with the first fitting portion 12 of the first body 10 , so that the second end face 410 and the first end face 100 are fitted together. The gap between them is in the shape of a circuitous path.

But what is missing from this conventional spindle structure is:

1. As shown in Figure 8, the second fitting portion 412 is fitted with the first fitting portion 12, so that only the gap between the second end face 410 and the first end face 100 is formed. In the shape of a detour, only the first body 10 and the first precision nut 41 constitute the detour, and the detour is relatively monotonous and easy to enter.

2. Please supplement as shown in the second figure of the Taiwan Bulletin. The first precision nut group 40 is different from the commonly used or used precision nut structure. The first precision nut group 40 needs to be processed and customized separately. If the second end face 410 is provided with the second fitting portion 412 , the cost of the first precision nut set 40 is greatly increased.

In view of the above-mentioned deficiency of the conventional structure, the inventor of the present invention has finally developed a product with a main shaft structure that can solve the drawbacks of the conventional structure with years of experience in manufacturing, production and design in related industries.

The problem to be solved by the invention: In the conventional main shaft structure, only the first body 10 and the first precision nut 41 constitute the circuitous path, and the circuitous path is relatively monotonous and easy to enter. In the main shaft structure of the present invention, there is the first gap between the back cover and the precision nut, the first gap is in the shape of an L-shaped circuitous path, and the gap between the first fitting portion and the second fitting portion is The inter-system has the Two gaps, the second gap is in the shape of a U-shaped circuitous path, and the probability of the liquid or the cutting fluid entering the interior of the spindle structure through the two circuitous paths of the second gap and the first gap is greatly reduced.

Technical means for solving the problem: The present invention relates to a main shaft structure, which includes: a system is provided with a first accommodating groove, a ring convex rib, a first end face and a ring groove; a rotating shaft is provided with a second screw. A joint part and a first peripheral surface; a precision nut is provided with a second end surface; a back cover and the precision nut have a first gap, the first gap is in the shape of an L-shaped circuitous path, the back cover It is provided with a first fitting part, a second accommodating groove, a third end face and a fourth end face; the sealing element is concavely provided with a second fitting part, and the second fitting part is used for the first fitting part. The sleeve part is compatible, there is a second gap between the second sleeve part and the first sleeve part, the second gap is connected to the first gap, and the second gap is a curved U shape The shape of a circuitous path; the second sleeve part is provided with a protruding part.

Compared with the effect of the prior art: there is the first gap between the back cover and the precision nut, the first gap is in the shape of an L-shaped circuitous path, and between the first fitting portion and the second fitting portion The second gap is provided, and the second gap is in the shape of a U-shaped circuitous path. The liquid or the cutting fluid enters the interior of the spindle structure through the two circuitous paths of the second gap and the first gap, causing damage. That is greatly reduced. The precision nut is a commonly used precision nut structure, and does not need to be specially customized. Compared with the spindle structure such as the Taiwan patent case, the cost of manufacturing the spindle structure is reduced.

In order to make the committee members and those skilled in the art fully understand the effect of the present invention, the structure and composition of the present invention are explained in the following in conjunction with the drawings and drawing 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. Therefore, any modification made under the spirit of the present invention should still belong to the protection scope of the present invention.

10: Ontology

11: The first tank

12: Ring rib

13: The first end face

14: Ring groove

15: The first screw part

20: Rotation shaft

21: The second screw part

22: First week face

30: Ring body

40: Precision Nut

41: Second end face

50: Back cover

51: The first set of joints

52: Second week face

53: Third week face

531: First groove

54: Fourth week face

541: Second groove

55: Second container

56: Third end face

57: Fourth end face

58: The first slot

60: Screw parts

70: Sealing parts

71: The second set of joints

72: Fifth week face

73: Sixth week face

74: Seventh week face

75: Projection

76: Fifth end face

80: first gap

81: Second gap

Figure 1 is an exploded perspective view of the main shaft structure of the present invention.

Figure 2 is a side view of the rear cover 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 main shaft structure sealing member of the present invention.

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

FIG. 6 is a three-dimensional combined view of the main shaft structure of the present invention.

Figure 7 is a top view of the main shaft structure of the present invention.

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

Fig. 9 is an enlarged view of the position D of Fig. 8 of the present invention.

FIG. 10 is an enlarged cross-sectional view of the second embodiment of the present invention.

FIG. 11 is an enlarged cross-sectional view of the third embodiment of the present invention.

FIG. 12 is an enlarged cross-sectional view of the fourth embodiment of the present invention.

First, please refer to FIGS. 1 to 9. FIG. 1 is an exploded perspective view of the main shaft structure of the present invention, FIG. 2 is a side view of the rear cover 50 of the main shaft structure of the present invention, and FIG. 3 is a cross-sectional view of FIG. Fig. 4 is a side view of the main shaft structure sealing member 70 of the present invention, and Fig. 5 is B-B of Fig. 4 of the present invention Figure 6 is a three-dimensional combined view of the main shaft structure of the present invention; Figure 7 is a top view of the main shaft structure of the present invention; The enlarged view of the present invention relates to a main shaft structure, which includes:

A main body 10, the main body 10 is assembled on various types of machine tools or various processing master machines, the main body 10 is provided with a first accommodating groove 11, the first accommodating groove 11 runs through the main body 10, the first accommodating groove 11 The accommodating groove 11 is in the shape of a circular groove, and one end of the main body 10 is protruded with a protruding rib 12 . The protruding rib 12 is in the shape of a circular ring. 13 is in the shape of a plane, a ring groove 14 is formed on the outer peripheral surface of the annular rib 12, and one end of the main body 10 is provided with a plurality of first screw parts 15, and the plurality of first screw parts 15 are connected with the first screw part 15. A accommodating groove 11 is arranged in a ring-shaped space with an axis;

A rotating shaft 20 , the rotating shaft 20 is pivoted in the first accommodating groove 11 , the rotating shaft 20 is in a rapid rotation shape, and at least one set of the rotating shaft 20 and the first accommodating groove 11 is connected Bearing parts, one end of the rotating shaft 20 is used for assembling various tools, the rotating shaft 20 is provided with a second screwing part 21, the second screwing part 21 is in the shape of an external thread, and the outer peripheral surface of the rotating shaft 20 is The system is provided with a first peripheral surface 22;

A ring body 30 is sleeved on the ring groove 14 , the ring body 30 is in a tight fit with the ring groove 14 , the ring body 30 is in the shape of a circle, and the ring body 30 is Soft material structure;

A precision nut 40, the precision nut 40 is assembled or screwed with the rotating shaft 20, the precision nut 40 rotates with the rotating shaft 20, and the precision nut 40 is screwed to the second At the screwing portion 21, one end of the precision nut 40 is provided with a second end surface 41, and the second end surface 41 is flat;

A back cover 50 , please refer to FIG. 2 and FIG. 3 , the back cover 50 is fixed with the main body 10 , the ring body 30 and the precision nut 40 are hidden in the back cover 50 , the precision The nut 40 is pivoted in the main body 10 and the rear cover 50 . The rear cover 50 and the precision nut 40 have a first gap 80 , and the first gap 80 is in the shape of an L-shaped circuitous path. One end of the cover 50 is provided with a first fitting portion 51 . The cross-section of the first fitting portion 51 is in the shape of a stepped bump. The outer peripheral surface of the first fitting portion 51 is arranged in sequence from the inside to the outside. There is a second peripheral surface 52, a third peripheral surface 53 and a fourth peripheral surface 54. The diameter of the second peripheral surface 52 is larger than that of the third peripheral surface 53, and the diameter of the third peripheral surface 53 is larger than that of the third peripheral surface 53. On the peripheral surface 54, a first groove 531 is formed in a ring between the second peripheral surface 52 and the third peripheral surface 53. The first groove 531 is in the shape of a ring groove. The outer diameter is smaller than the outer diameter of the third peripheral surface 53 . A second groove 541 is formed between the third peripheral surface 53 and the fourth peripheral surface 54 , and the second groove 541 is a ring groove. shape, the outer diameter of the second groove 541 is smaller than the outer diameter of the fourth peripheral surface 54;

The rear cover 50 is provided with a second accommodating groove 55 , the second accommodating groove 55 penetrates the rear cover 50 , the second accommodating groove 55 is in the shape of a circular groove, and the rotating shaft 20 extends through the second accommodating groove 55 . In the groove 55 , a third end face 56 and a fourth end face 57 are formed on the second accommodating groove 55 facing the main body 10 . The third end face 56 and the fourth end face 57 have a height difference. The third end face 56 and the fourth end face 57 The fourth end surface 57 is parallel, the third end surface 56 is opposite to the first end surface 13 , there is a gap or no gap between the third end surface 56 and the first end surface 13 , the The fourth end surface 57 is opposite to the second end surface 41, and a part of the path of the first gap 80 is located between the fourth end surface 57 and the second end surface 41;

The rear cover 50 is provided with a plurality of first through grooves 58 , each of the first through grooves 58 is aligned with each of the first screw parts 15 , and the plurality of first through grooves 58 are defined by the second accommodating groove 55 . Axle is spacer ring The number of the plurality of first through grooves 58 is matched with the number of the plurality of first screw parts 15;

A plurality of screwing parts 60, the screwing parts 60 are in the shape of external threads, the number of the plurality of screwing parts 60 is matched with the number of the plurality of first screwing parts 15 and the plurality of first through grooves 58, the screw The engaging piece 60 is inserted through the first through groove 58 and screwed to the first screwing portion 15, so that the rear cover 50 is assembled on the main body 10;

A sealing member 70, as shown in FIG. 4 to FIG. 5, is assembled with the rotating shaft 20, and the rear cover 50 is partially hidden in the sealing member 70. The sealing member 70 is The device 70 is in the shape of a cylinder or various shapes, the sealing member 70 is combined with the first peripheral surface 22 , the sealing member 70 drives the rotating shaft 20 to rotate, and the sealing member 70 can be It is a pulley member. One end of the sealing member 70 is recessed with a second fitting portion 71 . The second fitting portion 71 is compatible with the first fitting portion 51 . The second fitting portion 71 is connected to the A second gap 81 is defined between the first fitting parts 51 , the second gap 81 communicates with the first gap 80 , the second gap 81 is in the shape of a U-shaped circuitous path, and the second fitting part 71 The cross-section of the first fitting portion 51 is matched with the first fitting portion 51, and the cross-section of the second fitting portion 71 is slightly stepped groove shape;

A fifth peripheral surface 72 , a sixth peripheral surface 73 and a seventh peripheral surface 74 are sequentially formed on the inner peripheral surface of the second fitting portion 71 from the outside to the inside. The diameter of the fifth peripheral surface 72 is larger than the diameter of the sixth peripheral surface 73 , the diameter of the sixth peripheral surface 73 is larger than the diameter of the seventh peripheral surface 74 , the fifth peripheral surface 72 is opposite to the second peripheral surface 52 , and the sixth peripheral surface 72 is opposite to the second peripheral surface 52 . The peripheral surface 73 is opposite to the third peripheral surface 53 , the seventh peripheral surface 74 is opposite to the fourth peripheral surface 54 , and a part of the path of the second gap 81 is located between the second peripheral surface 52 and the fourth peripheral surface 54 . Between the fifth peripheral surface 72, between the third peripheral surface 53 and the sixth peripheral surface 73, and between the fourth peripheral surface 54 and the seventh peripheral surface, the first groove 531 is located in the second peripheral surface between At the turning point of the path of the gap 81, the second groove 541 is located at the turning point of the path of the second gap 81;

The second fitting portion 71 is provided with a protruding portion 75 , the protruding portion 75 is accommodated in the second accommodating groove 55 , and the protruding portion 75 is located between the first peripheral surface 22 and the second accommodating portion 75 . Between the grooves 55, part of the path of the second gap 81 is located between the outer peripheral surface of the protruding portion 75 and the inner peripheral surface of the second accommodating groove 55;

The end surface of the protruding portion 75 is provided with a fifth end surface 76 , the fifth end surface 76 is opposite to the second end surface 41 , the fifth end surface 76 is flat, and the fifth end surface 76 and the second end surface There is a gap or no gap between 41 , and the fifth end surface 76 is flush with the fourth end surface 57 .

Please refer to FIG. 7 to FIG. 9 , the rotating shaft 20 is pivoted in the main body 10 , the ring body 30 is sleeved on the ring groove 14 , and the precision nut 40 is connected with the second screwing part 21 are screwed together, the back cover 50 is assembled on the main body 10, the precision nut 40 is hidden in the main body 10 and the back cover 50, the screw element 60 is screwed on the first screw The rear cover 50 is fixed on the end of the main body 10 at the part 15 and the first through groove 58, the rear cover 50 and the precision nut 40 have the first gap 80, and the sealing member 70 is combined At the first peripheral surface 22 , the sealing member 70 drives the rotating shaft 20 and the precision nut 40 to rotate synchronously, and the second engaging portion 71 and the first engaging portion 51 are provided with the second The gap 81 , the second gap 81 and the first gap 80 greatly reduce the probability of each liquid entering the body 10 .

Please continue to refer to FIG. 10 . FIG. 10 is an enlarged cross-sectional view of the second embodiment of the present invention. In this embodiment, the sealing member 70 may have a relatively short length, and the sealing member 70 is not a pulley structure.

Please continue to refer to FIG. 11 . FIG. 11 is an enlarged cross-sectional view of a third embodiment of the present invention. In this embodiment, the second engaging portion 71 is not provided with the fifth peripheral surface 72 , and the second peripheral surface 52 is not provided with the fifth peripheral surface 72 . And the first groove 531 is exposed outside the sealing member 70 .

Please continue to refer to FIG. 12 . FIG. 12 is an enlarged cross-sectional view of the fourth embodiment of the present invention. In this embodiment, the second engaging portion 71 is not provided with the fifth peripheral surface 72 and the sixth peripheral surface 72 . The peripheral surface 73 , the second peripheral surface 52 , the third peripheral surface 53 and the first groove 531 are exposed outside the sealing member 70 .

The advantages of the main shaft structure of the present invention lie in:

1. The rear cover 50 and the precision nut 40 have the first gap 80 , the first gap 80 is in the shape of an L-shaped circuitous path, between the first fitting portion 51 and the second fitting portion 71 The second gap 81 is provided, and the second gap 81 is in the shape of a U-shaped circuitous path. The liquid or the cutting fluid enters the interior of the spindle structure through the two circuitous paths of the second clearance 81 and the first clearance 80. The chance of causing damage is greatly reduced.

2. There is a relative alignment between the precision nut 40 and the rear cover 50 , a relative alignment between the precision nut 40 and the sealing member 70 , and a relative alignment between the rear cover 50 and the sealing member 70 . There are relatively positive, that is, there is a structural relationship between the precision screw cap 40, the back cover 50 and the sealing member 70, that is, a better assembly structure.

3. Part of the path of the second gap 81 is located between the second peripheral surface 52 and the fifth peripheral surface 72 , between the third peripheral surface 53 and the sixth peripheral surface 73 and the fourth peripheral surface Between 54 and the seventh peripheral surface, part of the path of the second gap 81 has five corners, and the second gap 81 has a liquid-proof effect.

4. The first groove 531 is formed between the second peripheral surface 52 and the third peripheral surface 53, and the second groove is formed between the third peripheral surface 53 and the fourth peripheral surface 54 541, the first groove 531 is located in At the turning corner of the path of the second gap 81 , the second groove 541 is located at the turning corner of the path of the second gap 81 , and the first groove 531 and the second groove 541 are an accommodating space The liquid or cutting fluid entering from the outside can be temporarily stored, and the difficulty is increased when the liquid or the cutting fluid enters the interior of the main body 10 .

5. With the ring body 30 , it is impossible for the liquid and the cutting fluid to enter between the first end face 13 and the third end face 56 from between the main body 10 and the back cover 50 and into the main body 10 Inside, if each of the liquid and each of the cutting fluids accidentally pass through the ring body 30, an L-shaped circuitous path is formed between the annular rib 12 and the rear cover 50, which can also reduce the entry of the liquid or the cutting fluid into the ring body 30. Probability inside the spindle structure.

6. The precision nut 40 is a commonly used precision nut structure and does not need to be specially customized. Compared with the spindle structure such as Taiwan Patent No. 107110781, the cost of manufacturing the spindle structure is reduced.

Therefore, the main shaft structure of the present invention has industrial applicability, novelty and progress, and can sincerely meet the application requirements for an invention patent, and an application can be filed in accordance with the law.

10: Ontology

11: The first tank

12: Ring rib

13: The first end face

14: Ring groove

15: The first screw part

20: Rotation shaft

21: The second screw part

22: First week face

30: Ring body

40: Precision Nut

41: Second end face

50: Back cover

60: Screw parts

70: Sealing parts

Claims (11)

A main shaft structure comprises: a main body, the main body is provided with a first accommodating groove, one end of the main body is protruded with a ring convex rib, the ring convex rib is in the shape of a circular ring, and the ring convex rib is set There is a first end surface, a ring groove is formed on the outer peripheral surface of the ring convex rib; a rotating shaft is pivoted in the first accommodating groove, and the rotating shaft is provided with a second screwing part, The second screwing portion is in the shape of an external thread, and the outer peripheral surface of the rotating shaft is provided with a first peripheral surface; a ring body, the ring system is sleeved at the ring groove; a precision nut, the precision nut It is assembled or screwed with the rotating shaft, the precision nut rotates with the rotating shaft, the precision nut is screwed at the second screwing part, and one end of the precision nut is provided with a second end face; a back cover, the back cover is assembled with the main body, the ring body and the precision nut are hidden in the back cover, the precision nut is pivoted in the main body and the back cover, the The back cover and the precision nut have a first gap, the first gap is in the shape of an L-shaped circuitous path, and one end of the back cover is provided with a first fitting portion; the cross-section of the first fitting portion is roughly Step-shaped bump shape, the outer peripheral surface of the first sleeve portion is sequentially provided with a second peripheral surface and a third peripheral surface from the inside to the outside. The diameter of the second peripheral surface is larger than that of the third peripheral surface ; The rear cover is provided with a second accommodating groove, the second accommodating groove runs through the rear cover, the second accommodating groove is in the shape of a circular groove, the rotating shaft extends through the second accommodating groove, and the first accommodating groove is in the shape of a circular groove. A third end face and a fourth end face are formed on the two accommodating grooves facing the body, and the third end face is opposite to the first end face Positive, there is a gap or no gap between the third end surface and the first end surface, the fourth end surface is opposite to the second end surface, and part of the path of the first gap is located on the fourth end surface and the second end face; a sealing member, the sealing member is assembled with the rotating shaft, the rear cover is partially hidden in the sealing member, and one end of the sealing member is recessed with a first Two fitting parts, the second fitting part is compatible with the first fitting part, a second gap is defined between the second fitting part and the first fitting part, and the second gap is Connecting with the first gap, the second gap is in the shape of a U-shaped circuitous path; the cross section of the second sleeve part is matched with the first sleeve part, and the cross section of the second sleeve part is slightly stepped Grooved, the inner peripheral surface of the second fitting portion is sequentially provided with a fifth peripheral surface and a sixth peripheral surface from the outside to the inside, and the diameter of the fifth peripheral surface is larger than that of the sixth peripheral surface The diameter of the fifth peripheral surface is opposite to the second peripheral surface, the sixth peripheral surface is opposite to the third peripheral surface, and part of the path of the second gap is located between the second peripheral surface and the third peripheral surface. between the fifth peripheral surface and between the third peripheral surface and the sixth peripheral surface; the second fitting portion is provided with a protruding portion, the protruding portion is accommodated in the second accommodating groove, the The protruding portion is located between the first peripheral surface and the second accommodating groove, and a part of the path of the second gap is located between the outer peripheral surface of the protruding portion and the inner peripheral surface of the second accommodating groove. The main shaft structure according to claim 1, wherein the main body is assembled on various machine tools or various machining mother machines, the first accommodating groove runs through the main body, the first accommodating groove is in the shape of a circular groove, the The first end face is flat. The main shaft structure according to claim 1, wherein one end of the main body is provided with a plurality of first screwing parts, and the plurality of first screwing parts are arranged in a spaced annular shape with the first receiving groove as the axis; the The back cover is provided with a plurality of first through grooves, and each first through groove is aligned with each first screw. a joint part, the plurality of first through grooves are arranged in a spaced annular shape with the second accommodating groove as the axis, the number of the plurality of first through grooves is matched with the number of the plurality of first screw parts; A plurality of screw parts, the screw parts are in the shape of external threads, the number of the plurality of screw parts is matched with the number of the plurality of first screw parts and the plurality of first through grooves, and the screw parts are threaded through The rear cover is assembled on the main body by screwing the first screwing portion in the first through groove. The main shaft structure according to claim 1, wherein the rotating shaft rotates rapidly, at least one bearing is arranged between the rotating shaft and the first accommodating groove, and one end of the rotating shaft is used for assembling various tools . The main shaft structure according to claim 1, wherein the ring system and the ring groove are in a tight fit shape, the ring system is in the shape of a circle, and the ring system is in a soft material structure. The main shaft structure according to claim 1, wherein the second end face is flat. The main shaft structure according to claim 1, wherein the first fitting portion is provided with a fourth peripheral surface, the diameter of the third peripheral surface is larger than that of the fourth peripheral surface; the second fitting portion is provided with a The seventh peripheral surface, the diameter of the sixth peripheral surface is larger than the diameter of the seventh peripheral surface, the seventh peripheral surface is opposite to the fourth peripheral surface, and the part of the path of the second gap is located in the fourth peripheral surface. between the peripheral surface and the seventh peripheral surface. The main shaft structure according to claim 7, wherein a first groove is annularly formed between the second peripheral surface and the third peripheral surface, the first groove is in the shape of a ring groove, and the first concave The outer diameter of the groove is smaller than the outer diameter of the third peripheral surface, and a second groove is arranged between the third peripheral surface and the fourth peripheral surface, and the second groove is in the shape of a ring groove. The outer diameter of the second groove is smaller than the outer diameter of the fourth peripheral surface; the first groove is located at the turning point of the path bend of the second gap, and the second groove is located at the path bend of the second gap corner turning. The main shaft structure according to claim 1, wherein the third end surface and the fourth end surface have a height difference, and the third end surface and the fourth end surface are parallel. The main shaft structure according to claim 1, wherein the sealing member is in the shape of a cylinder, the sealing member is coupled to the first peripheral surface, the sealing member drives the rotating shaft to rotate, and the sealing member is in the shape of a cylinder. The device may be a pulley member. The main shaft structure of claim 1, wherein the end face of the protruding portion is provided with a fifth end face, the fifth end face is opposite to the second end face, the fifth end face is flat, and the fifth end face is in the shape of a plane. There is a gap or no gap between the end face and the second end face, or the fifth end face is flush with the fourth end face.

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