Rear waterproof and dustproof structure of the main shaft

Abstract

The present invention relates to a waterproof and dustproof structure at the rear of a main shaft, which comprises: a main body provided with a first receiving groove, a ring convex rib, a first end face and a ring groove; a rotating shaft provided with a second screwing portion and a first circumferential surface; a precision nut provided with a second end face; a rear cover having a first gap with the precision nut, the first gap being in an L-shaped meandering path, the rear cover being provided with a first fitting portion, a second receiving groove, a third end face and a fourth end face; a sealing member recessed with a second fitting portion, the second fitting portion being adapted to receive the first fitting portion, a second gap being provided between the second fitting portion and the first fitting portion, the second gap communicating with the first gap, the second gap being in a U-shaped meandering path; the second fitting portion being provided with a protruding portion.

Description

Technical Field

[0001] The present invention relates to a waterproof and dustproof structure at the rear of a main shaft, and particularly to a waterproof and dustproof structure at the rear of a main shaft. There is a first gap between the rear cover and the precision nut, the first gap is in an L-shaped circuitous path, a second gap is provided between the first fitting portion and the second fitting portion, the second gap is in a U-shaped circuitous path, and the probability of liquid entering the interior of the waterproof and dustproof structure at the rear of the main shaft through the second gap and the first gap is reduced. Background Art

[0002] As previously known, this is also the patent prior case applied by the applicant. A common waterproof and dustproof structure at the rear of a main shaft, such as the Taiwan, China patent case number: 107110781, certificate number: I647034, China application number: 201810386354.2, patent name: Waterproof and Dustproof Structure at the Rear of a Main Shaft. The structure of this patent case is as follows: a first body 10 is assembled on various machine tools or various machining mother machines. One end of the first body 10 is provided with a first end face 100, a first receiving groove 11 is provided inside the first body 10, the first receiving groove 11 is a through groove, and a first fitting portion 12 is provided at the first end face 10; a rotating shaft 20 is pivotally arranged in the first receiving groove 11 of the first body 10, the rotating shaft 20 rotates rapidly in the first receiving groove 11, one end of the rotating shaft 20 is provided with a first screwing portion 21, and the first screwing portion 21 is in an external thread shape; a first precision nut set 40 is screwed at the first screwing portion 21, and the first precision nut set 40 includes a first precision nut 41; the first precision nut 41 is provided with a second end face 410, the second end face 410 is opposite to the first end face 100, there is a small gap between the second end face 410 and the first end face 410, the first precision nut 41 is provided with a second screwing portion 411, the second screwing portion 411 is for the first screwing portion 21 to pass through and be screwed, the second screwing portion 411 is in an internal thread shape, and a second fitting portion 412 is provided in a ring shape at the second end face 410. The second fitting portion 412 is sleeved with the first fitting portion 12 of the first body 10, so that the gap between the second end face 410 and the first end face 100 is in a circuitous path.

[0003] However, the disadvantages of this common waterproof and dustproof structure at the rear of the main shaft are as follows:

[0004] 1. Please refer to Figure 8 As shown, the second fitting portion 412 is sleeved with the first fitting portion 12, only making the gap between the second end face 410 and the first end face 100 in a circuitous path. Only the first body 10 and the first precision nut 41 form the circuitous path, and the circuitous path is relatively monotonous and easy to enter.

[0005] 2. Please refer to theFigure 2 As shown, the first precision nut set 40 is different from the commonly used or common precision nut structures. The first precision nut set 40 needs to be processed and customized separately, so that a second fitting portion 412 is provided around the second end face 410, and the cost of the first precision nut set 40 is greatly increased.

[0006] In view of the disadvantages of the above-mentioned common structures, the inventor, based on years of experience in manufacturing, production and design in the relevant industry, finally has a product of the waterproof and dustproof structure at the rear of the main shaft that can solve the common drawbacks. Summary of the Invention

[0007] The main object of the present invention is that in the waterproof and dustproof structure at the rear of the main shaft of the present invention, there is a first gap between the rear cover and the precision nut. The first gap is in an L-shaped circuitous path. A second gap is provided between the first fitting portion and the second fitting portion. The second gap is in a U-shaped circuitous path. The probability that the liquid or the cutting fluid enters the interior of the waterproof and dustproof structure at the rear of the main shaft through the two circuitous paths of the second gap and the first gap and causes damage is greatly reduced.

[0008] To achieve the above object, a waterproof and dustproof structure at the rear of a main shaft of the present invention is characterized in that it includes:

[0009] A body, a first receiving groove is provided inside the body. The first receiving groove penetrates the body. The first receiving groove is in a circular groove shape. One end of the body protrudes with an annular rib. The annular rib is in a circular ring shape. The annular rib is provided with a first end face. The first end face is in a flat shape. An annular groove is provided around the outer peripheral surface of the annular rib.

[0010] A rotating shaft, the rotating shaft is pivotally arranged in the first receiving groove. The rotating shaft is provided with a second screwing portion. The second screwing portion is in an external thread shape. A first peripheral surface is provided on the outer peripheral surface of the rotating shaft.

[0011] An annular body, the annular body is sleeved at the annular groove.

[0012] A precision nut, the precision nut 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 portion. One end of the precision nut is provided with a second end face.

[0013] A rear cover, the rear cover is assembled with the body. The annular body and the precision nut are hidden inside the rear cover. The precision nut is pivotally arranged inside the body and the rear cover. There is a first gap between the rear cover and the precision nut. The first gap is in an L-shaped circuitous path. One end of the rear cover is provided with a first fitting portion. The cross section of the first fitting portion is slightly in a stepped convex block shape. The outer peripheral surface of the first fitting portion is sequentially provided with a second peripheral surface, a third peripheral surface and a fourth peripheral surface in the direction from the inside to the outside. The diameter of the second peripheral surface is larger than that of the third peripheral surface. The diameter of the third peripheral surface is larger than that of the fourth peripheral surface.

[0014] The rear cover is provided with a second receiving groove which penetrates through the rear cover. The second receiving groove is in the shape of a circular groove. The rotating shaft extends through the second receiving groove. A third end face and a fourth end face are provided at the position where the second receiving groove faces the main body. The third end face is directly opposite to the first end face. There is a slight gap or no gap between the third end face and the first end face. The fourth end face is directly opposite to the second end face. A partial path of the first gap is located between the fourth end face and the second end face;

[0015] A sealing member is assembled with the rotating shaft. A part of the rear cover is hidden in the sealing member. A second fitting portion is recessed at one end of the sealing member. The first fitting portion is compatibly arranged in the second fitting portion. A second gap is provided between the second fitting portion and the first fitting portion. The second gap communicates with the first gap. The second gap is in the shape of a U-shaped circuitous path. The cross-section of the second fitting portion cooperates with that of the first fitting portion. The cross-section of the second fitting portion is slightly in the shape of a stepped groove;

[0016] The inner peripheral surface of the second fitting portion is sequentially provided with a fifth peripheral surface, a sixth peripheral surface and a seventh peripheral surface in the direction from the outside to the inside. The diameter of the fifth peripheral surface is larger than that of the sixth peripheral surface. The diameter of the sixth peripheral surface is larger than that of the seventh peripheral surface. The fifth peripheral surface is directly opposite to the second peripheral surface. The sixth peripheral surface is directly opposite to the third peripheral surface. The seventh peripheral surface is directly opposite to the fourth peripheral surface. A partial path of the second gap is located between the second peripheral surface and the fifth peripheral surface, between the third peripheral surface and the sixth peripheral surface, and between the fourth peripheral surface and the seventh peripheral surface;

[0017] The second fitting portion is provided with a protruding portion which is received in the second receiving groove. The protruding portion is located between the first peripheral surface and the second receiving groove. A partial path of the second gap is located between the outer peripheral surface of the protruding portion and the inner peripheral surface of the second receiving groove.

[0018] The main function of the present invention is that: there is the first gap between the rear cover and the precision nut. The first gap is in the shape of an L-shaped circuitous path. There is the second gap between the first fitting portion and the second fitting portion. The second gap is in the shape of a U-shaped circuitous path. The probability that the liquid or the cutting fluid enters the inside of the waterproof and dustproof structure at the rear part of the main shaft through the two circuitous paths of the second gap and the first gap and causes damage is greatly reduced. The precision nut is a commonly used precision nut structure and does not need to be specially customized. Compared with the waterproof and dustproof structure at the rear part of the main shaft with the patent number in Taiwan, China, the cost of manufacturing the waterproof and dustproof structure at the rear part of the main shaft is reduced. Description of the Drawings

[0019] Figure 1 It is an exploded perspective view of the waterproof and dustproof structure at the rear part of the main shaft of the present invention.

[0020] Figure 2 It is a side view of the rear cover of the waterproof and dustproof structure of the main shaft of the present invention.

[0021] Figure 3 It is the Figure 2 cross-sectional view at A-A of the present invention.

[0022] Figure 4 It is a side view of the sealing member of the waterproof and dustproof structure of the rear part of the main shaft of the present invention.

[0023] Figure 5 It is the Figure 4 cross-sectional view at B-B of the present invention.

[0024] Figure 6 It is a three-dimensional combined view of the waterproof and dustproof structure of the rear part of the main shaft of the present invention.

[0025] Figure 7 It is a top view of the waterproof and dustproof structure of the rear part of the main shaft of the present invention.

[0026] Figure 8 It is the Figure 7 cross-sectional view at C-C of the present invention.

[0027] Figure 9 It is the Figure 8 enlarged view at D of the present invention.

[0028] Figure 10 It is an enlarged cross-sectional view of the second embodiment of the present invention.

[0029] Figure 11 It is an enlarged cross-sectional view of the third embodiment of the present invention.

[0030] Figure 12 It is an enlarged cross-sectional view of the fourth embodiment of the present invention. Specific Embodiments

[0031] First, please refer to Figures 1 to 9 as shown, Figure 1 It is a three-dimensional exploded view of the waterproof and dustproof structure of the rear part of the main shaft of the present invention, Figure 2 It is a side view of the rear cover 50 of the waterproof and dustproof structure of the rear part of the main shaft of the present invention, Figure 3 It is the Figure 2 cross-sectional view at A-A of the present invention, Figure 4 It is a side view of the sealing member 70 of the waterproof and dustproof structure of the rear part of the main shaft of the present invention, Figure 5 It is the Figure 4 cross-sectional view at B-B of the present invention, Figure 6 It is a three-dimensional combined view of the waterproof and dustproof structure of the rear part of the main shaft of the present invention, Figure 7 It is a top view of the waterproof and dustproof structure of the rear part of the main shaft of the present invention, Figure 8 It is the Figure 7 cross-sectional view at C-C of the present invention,Figure 9 is a magnified view of point D of the present invention Figure 8 The present invention relates to a waterproof and dustproof structure at the rear of a main shaft, which includes:

[0032] A body 10, which is assembled on various machine tools or various machining mother machines. A first receiving groove 11 is provided inside the body 10. The first receiving groove 11 penetrates the body 10 and is in a circular groove shape. One end of the body 10 protrudes with an annular convex rib 12. The annular convex rib 12 is in a ring shape. The annular convex rib 12 is provided with a first end face 13, and the first end face 13 is in a flat shape. An annular groove 14 is provided around the outer peripheral surface of the annular convex rib 12. One end of the body 10 is provided with a plurality of first screwing parts 15, and the plurality of first screwing parts 15 are arranged in a spaced annular shape with the first receiving groove 11 as the axis;

[0033] A rotating shaft 20, which is pivotally arranged in the first receiving groove 11. The rotating shaft 20 rotates rapidly. At least one set of bearing parts is provided between the rotating shaft 20 and the first receiving groove 11. One end of the rotating shaft 20 is for assembling various cutting tools. The rotating shaft 20 is provided with a second screwing part 21, and the second screwing part 21 is in an external thread shape. A first peripheral surface 22 is provided on the outer peripheral surface of the rotating shaft 20;

[0034] A ring body 30, which is sleeved at the annular groove 14. The ring body 30 and the annular groove 14 are in a tight fit. The ring body 30 is in a circular shape and is made of a soft material structure;

[0035] A precision nut 40, which is assembled or screwed with the rotating shaft 20. The precision nut 40 rotates with the rotating shaft 20. The precision nut 40 is screwed at the second screwing part 21. One end of the precision nut 40 is provided with a second end face 41, and the second end face 41 is in a flat shape;

[0036] A rear cover 50, please supplement with Figure 2 and Figure 3As shown, the rear cover 50 is fixedly provided with the body 10. The ring body 30 and the precision nut 40 are hidden inside the rear cover 50. The precision nut 40 is pivotally provided inside the body 10 and the rear cover 50. There is a first gap 80 between the rear cover 50 and the precision nut 40. The first gap 80 is in the shape of an L-shaped tortuous path. One end of the rear cover 50 is provided with a first fitting portion 51. The cross-section of the first fitting portion 51 is slightly in the shape of a stepped convex block. The outer peripheral surface of the first fitting portion 51 is sequentially provided with a second peripheral surface 52, a third peripheral surface 53, and a fourth peripheral surface 54 in the direction from the inside to the outside. The diameter of the second peripheral surface 52 is greater than that of the third peripheral surface 53. The diameter of the third peripheral surface 53 is greater than that of the fourth peripheral surface 54. A first groove 531 is provided annularly between the second peripheral surface 52 and the third peripheral surface 53. The first groove 531 is in the shape of an annular groove. The outer diameter of the first groove 531 is smaller than the outer diameter of the third peripheral surface 53. A second groove 541 is provided annularly between the third peripheral surface 53 and the fourth peripheral surface 54. The second groove 541 is in the shape of an annular groove. The outer diameter of the second groove 541 is smaller than the outer diameter of the fourth peripheral surface 54;

[0037] The rear cover 50 is provided with a second receiving groove 55. The second receiving groove 55 penetrates the rear cover 50. The second receiving groove 55 is in the shape of a circular groove. The rotating shaft 20 extends through the second receiving groove 55. A third end face 56 and a fourth end face 57 are provided on the second receiving groove 55 facing the body 10. There is a height difference between the third end face 56 and the fourth end face 57. The third end face 56 and the fourth end face 57 are parallel to each other. The third end face 56 is aligned with the first end face 13. There is slightly a gap or no gap between the third end face 56 and the first end face 13. The fourth end face 57 is aligned with the second end face 41. A partial path of the first gap 80 is located between the fourth end face 57 and the second end face 41;

[0038] The rear cover 50 is provided with a plurality of first through grooves 58. Each first through groove 58 is aligned with each first screwing portion 15. The plurality of first through grooves 58 are arranged in a spaced annular pattern with the second receiving groove 55 as the axis. The number of the plurality of first through grooves 58 matches the number of the plurality of first screwing portions 15;

[0039] A plurality of screw members 60. The screw members 60 are in the shape of external threads. The number of the plurality of screw members 60 matches the number of the plurality of first screwing portions 15 and the number of the plurality of first through grooves 58. The screw members 60 pass through the first through grooves 58 and are screwed to the first screwing portions 15, so that the rear cover 50 is assembled on the body 10;

[0040] A sealing member 70, please supplement with Figures 4 to 5As shown, the sealing member 70 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 cylindrical or in various shapes. The sealing member 70 is combined with the first circumferential surface 22, and the sealing member 70 drives the rotating shaft 20 to rotate. The sealing member 70 is a pulley member. A second sleeve portion 71 is recessed at one end of the sealing member 70. The second sleeve portion 71 is compatible with the first sleeve portion 51. A second gap 81 is provided between the second sleeve portion 71 and the first sleeve portion 51. The second gap 81 is connected to the first gap 80. The second gap 81 is in the shape of a U-shaped circuitous path. The cross-section of the second sleeve portion 71 matches the first sleeve portion 51, and the cross-section of the second sleeve portion 71 is slightly stepped.

[0041] The inner circumference of the second sleeve-fitting portion 71 is provided with a fifth circumferential surface 72, a sixth circumferential surface 73 and a seventh circumferential surface 74 in sequence from the outside to the inside. The diameter of the fifth circumferential surface 72 is greater than the diameter of the sixth circumferential surface 73, and the diameter of the sixth circumferential surface 73 is greater than the diameter of the seventh circumferential surface 74. The fifth circumferential surface 72 is aligned with the second circumferential surface 52, the sixth circumferential surface 73 is aligned with the third circumferential surface 53, and the seventh circumferential surface 74 is aligned with the fourth circumferential surface 54. Part of the path of the second gap 81 is located between the second circumferential surface 52 and the fifth circumferential surface 72, between the third circumferential surface 53 and the sixth circumferential surface 73, and between the fourth circumferential surface 54 and the seventh circumferential surface. The first groove 531 is located at the turning point of the path of the second gap 81, and the second groove 541 is located at the turning point of the path of the second gap 81.

[0042] The second sleeve portion 71 is provided with a protruding portion 75, and the protruding portion 75 is received in the second receiving groove 55. The protruding portion 75 is located between the first circumferential surface 22 and the second receiving groove 55, and a part of the path of the second gap 81 is located between the outer circumferential surface of the protruding portion 75 and the inner circumferential surface of the second receiving groove 55.

[0043] The end surface of the protruding portion 75 is provided with a fifth end surface 76 , which is aligned with the second end surface 41 . The fifth end surface 76 is planar, with a slight gap or no gap between the fifth end surface 76 and the second end surface 41 , and the fifth end surface 76 is flush with the fourth end surface 57 .

[0044] Please assist Figures 7 to 9, the rotating shaft 20 is pivotally provided in the body 10, the annular body 30 is sleeved at the annular groove 14, the precision nut 40 is screwed with the second screwing portion 21, the rear cover 50 is assembled on the body 10, the precision nut 40 is hidden in the body 10 and the rear cover 50, the screwing member 60 is screwed at the first screwing portion 15 and the first through groove 58, so that the rear cover 50 is fixed at the end of the body 10, there is a first gap 80 between the rear cover 50 and the precision nut 40, 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, there is a second gap 81 between the second sleeving portion 71 and the first sleeving portion 51, and the second gap 81 and the first gap 80 greatly reduce the probability of various liquids entering the body 10.

[0045] Please continue to refer to Figure 10 , Figure 10 which is an enlarged sectional view of the second embodiment of the present invention. In this embodiment, the sealing member 70 can be of a shorter length, and the sealing member 70 is not a pulley structure.

[0046] Please continue to refer to Figure 11 , Figure 11 which is an enlarged sectional view of the third embodiment of the present invention. In this embodiment, the second sleeving portion 71 does not have the fifth peripheral surface 72, and the second peripheral surface 52 and the first groove 531 are exposed outside the sealing member 70.

[0047] Please continue to refer to Figure 12 as shown in Figure 12 which is an enlarged sectional view of the fourth embodiment of the present invention. In this embodiment, the second sleeving portion 71 does not have the fifth peripheral surface 72 and the sixth peripheral surface 73, and the second peripheral surface 52, the third peripheral surface 53 and the first groove 531 are exposed outside the sealing member 70.

[0048] The advantages of the waterproof and dustproof structure at the rear of the main shaft of the present invention are as follows:

[0049] 1. There is a first gap 80 between the rear cover 50 and the precision nut 40, the first gap 80 is in an L-shaped winding path, there is a second gap 81 between the first sleeving portion 51 and the second sleeving portion 71, the second gap 81 is in a U-shaped winding path, and the probability of the liquid or the cutting fluid entering the waterproof and dustproof structure at the rear of the main shaft through the two winding paths of the second gap 81 and the first gap 80 and causing damage is greatly reduced.

[0050] 2. There is relative alignment between the precision nut 40 and the rear cover 50, there is relative alignment between the precision nut 40 and the sealing member 70, and there is relative alignment between the rear cover 50 and the sealing member 70. That is, there is a structural relationship among the precision nut 40, the rear cover 50 and the sealing member 70, which has a better assembly structure.

[0051] 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 between the fourth peripheral surface 54 and the seventh peripheral surface, so that part of the path of the second gap 81 has five turning angles, and the second gap 81 further has the function of preventing liquid.

[0052] 4. The first groove 531 is provided annularly between the second peripheral surface 52 and the third peripheral surface 53, and the second groove 541 is provided annularly between the third peripheral surface 53 and the fourth peripheral surface 54. The first groove 531 is located at the turning angle of the path of the second gap 81, and the second groove 541 is located at the turning angle of the path of the second gap 81. The first groove 531 and the second groove 541 are accommodation spaces for temporarily storing the liquid or cutting fluid entering from the outside, and it is more difficult for the liquid or the cutting fluid to enter the inside of the main body 10.

[0053] 5. The ring body 30 is provided, so that it is impossible for each liquid and each cutting fluid to enter between the first end surface 13 and the third end surface 56 and then enter the main body 10 between the main body 10 and the rear cover 50. If each liquid and each cutting fluid accidentally pass through the ring body 30, an L-shaped detour path is formed between the ring rib 12 and the rear cover 50, which can also reduce the probability of each liquid or each cutting fluid entering the inside of the waterproof and dustproof structure at the rear of the main shaft.

[0054] 6. The precision nut 40 is a commonly used precision nut structure and does not need to be specially customized. Compared with the waterproof and dustproof structure at the rear of the main shaft in Taiwan Patent Case No. 107110781, the cost of manufacturing the waterproof and dustproof structure at the rear of the main shaft is reduced.

[0055] Therefore, the waterproof and dustproof structure at the rear of the main shaft of the present invention has industrial applicability, novelty and progressiveness, and can truly meet the application requirements of invention patents, and an application is filed according to law.

Claims

1. A waterproof and dustproof structure at the rear of the main shaft, characterized in that: It includes: A body, within which there is a first receiving groove that penetrates the body. The first receiving groove is in the shape of a circular groove. One end of the body protrudes with an annular convex rib. The annular convex rib is in the shape of a circular ring body. The annular convex rib has a first end face that is flat. The outer peripheral surface of the annular convex rib is provided with an annular groove. A rotating shaft that is pivotally arranged within the first receiving groove. The rotating shaft is provided with a second screwing part that is in the shape of an external thread. The outer peripheral surface of the rotating shaft is provided with a first peripheral surface. An annular body that is sleeved at the annular groove. A precision nut that 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. One end of the precision nut is provided with a second end face. A rear cover that is assembled with the body. The annular body and the precision nut are hidden within the rear cover. The precision nut is pivotally arranged within the body and the rear cover. There is a first gap between the rear cover and the precision nut. The first gap is in the shape of an L-shaped circuitous path. One end of the rear cover is provided with a first fitting part. The cross-section of the first fitting part is slightly in the shape of a stepped convex block. The outer peripheral surface of the first fitting part is sequentially provided with a second peripheral surface, a third peripheral surface, and a fourth peripheral surface in the direction from the inside to the outside. The diameter of the second peripheral surface is greater than that of the third peripheral surface, and the diameter of the third peripheral surface is greater than that of the fourth peripheral surface. The rear cover is provided with a second receiving groove that penetrates the rear cover. The second receiving groove is in the shape of a circular groove. The rotating shaft penetrates through the second receiving groove. The second receiving groove is provided with a third end face and a fourth end face facing the body. The third end face is aligned with the first end face. There is slightly a gap or no gap between the third end face and the first end face. The fourth end face is aligned with the second end face. A part of the path of the first gap is located between the fourth end face and the second end face. A sealing member that is assembled with the rotating shaft. A part of the rear cover is hidden within the sealing member. One end of the sealing member is recessed with a second fitting part for the first fitting part to be compatibly arranged. There is a second gap between the second fitting part and the first fitting part. The second gap communicates with the first gap. The second gap is in the shape of a U-shaped circuitous path. The cross-section of the second fitting part is matched with that of the first fitting part. The cross-section of the second fitting part is slightly in the shape of a stepped groove. The inner peripheral surface of the second fitting part is sequentially provided with a fifth peripheral surface, a sixth peripheral surface, and a seventh peripheral surface in the direction from the outside to the inside. The diameter of the fifth peripheral surface is greater than that of the sixth peripheral surface, and the diameter of the sixth peripheral surface is greater than that of the seventh peripheral surface. The fifth peripheral surface is aligned with the second peripheral surface, the sixth peripheral surface is aligned with the third peripheral surface, and the seventh peripheral surface is aligned with the fourth peripheral surface. A part of the path of the second gap is located between the second peripheral surface and the fifth peripheral surface, between the third peripheral surface and the sixth peripheral surface, and between the fourth peripheral surface and the seventh peripheral surface. The second fitting part is provided with a protruding part that is accommodated within the second receiving groove. The protruding part is located between the first peripheral surface and the second receiving groove. A part of the path of the second gap is located between the outer peripheral surface of the protruding part and the inner peripheral surface of the second receiving groove.

2. The waterproof and dustproof structure at the rear of the main shaft according to claim 1, wherein: Among them, The body is provided on various machine tools or various machining mother machines.

3. The waterproof and dustproof structure at the rear of the main shaft according to claim 1, characterized in that: Among them, One end of the 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 accommodating groove as the axis; the rear cover is provided with a plurality of first through grooves, and each first through groove is aligned with each first screwing part, and the plurality of first through grooves are arranged in a spaced annular shape with the second accommodating groove as the axis, and the number of the plurality of first through grooves matches the number of the plurality of first screwing parts; a plurality of screwing parts are provided, the screwing parts are in the shape of external threads, and the number of the plurality of screwing parts matches the number of the plurality of first screwing parts and the number of the plurality of first through grooves, and the screwing parts pass through the first through grooves and are screwed at the first screwing parts, so that the rear cover is assembled on the body.

4. The waterproof and dustproof structure at the rear of the main shaft according to claim 1, characterized in that: Among them, The rotating shaft rotates rapidly, and at least one set of bearing parts is provided between the rotating shaft and the first accommodating groove, and one end of the rotating shaft is for assembling various cutting tools.

5. The waterproof and dustproof structure at the rear of the main shaft according to claim 1, characterized in that: Among them, The ring body and the ring groove are in a tightly fitting state, the ring body is in a circular body shape, and the ring body is made of a soft material structure.

6. The waterproof and dustproof structure at the rear of the main shaft according to claim 1, characterized in that: Among them, The second end face is in a flat shape.

7. The waterproof and dustproof structure at the rear of the main shaft according to claim 1, wherein: Among them, A first groove is annularly provided between the second peripheral surface and the third peripheral surface, the first groove is in a ring groove shape, and the outer diameter of the first groove is smaller than the outer diameter of the third peripheral surface; a second groove is annularly provided between the third peripheral surface and the fourth peripheral surface, the second groove is in a ring groove shape, and 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 corner turning of the path of the second gap, and the second groove is located at the corner turning of the path of the second gap.

8. The waterproof and dustproof structure at the rear of the main shaft according to claim 1, characterized in that: Among them, There is a height difference between the third end face and the fourth end face, and the third end face and the fourth end face are parallel to each other.

9. The waterproof and dustproof structure at the rear of the spindle according to claim 1, characterized in that: Among them, The sealing part is in a cylindrical shape, the sealing part is combined at the first peripheral surface, the sealing part drives the rotating shaft to rotate, and the sealing part is a pulley part.

10. The waterproof and dustproof structure at the rear of the main shaft according to claim 1, characterized in that: Among them, A fifth end face is provided on the end face of the protruding part, the fifth end face is aligned with the second end face, the fifth end face is in a flat shape, there is a slight gap or no gap between the fifth end face and the second end face, or the fifth end face is flush with the fourth end face.

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