Module cylinder body and stacked cylinder automatic tool changing electric spindle

Abstract

The utility model discloses a module cylinder body and an automatic tool changing motorized spindle of a stacked cylinder. The module cylinder body comprises a peripheral cylinder wall. Wherein a first air return hole and a second air return hole are formed in the peripheral cylinder wall, both the first air return hole and the second air return hole extend in the axial direction, and the first air return hole and the second air return hole are spaced by 180 degrees in the circumferential direction; the distance between the first air return hole and the central axis of the peripheral cylinder wall is equal to the distance between the second air return hole and the central axis of the peripheral cylinder wall, the peripheral cylinder wall is further provided with a plurality of threaded holes and bolt through holes in one-to-one correspondence with the threaded holes, and the threaded holes and the bolt through holes extend in the axial direction. The threaded holes and the corresponding bolt through holes are spaced by 180 degrees in the circumferential direction. The utility model can be used for manufacturing the stacking cylinder, is suitable for large-batch processing and production, does not need independent customized processing, and further can reduce the processing cost and improve the processing efficiency.

Description

Technical Field

[0001] The utility model relates to a modular cylinder body and a superimposed cylinder automatic tool-changing electric spindle. Background Art

[0002] At present, the electric spindle needs to use a cylinder to drive the tool broaching rod to move during the tool placement and installation process. In the existing electric spindle, the cylinder diameter cannot be made very large due to the limitation of the electric spindle diameter. Therefore, the thrust of the cylinder is often not large enough, which will affect the one-time success rate of the electric spindle tool change. In order to solve the problem of insufficient cylinder thrust, some electric spindles choose to use superimposed cylinders to drive the tool broaching rod to move. The superimposed cylinder can increase the tool change thrust without expanding the cylinder diameter, thereby improving the one-time success rate of the tool change. For example, the Chinese patents with publication numbers CN217252863U, CN205309312U and CN209100400U all use superimposed cylinders in electric spindles.

[0003] Among them, the stacked cylinder includes multiple cylinder bodies connected in sequence. In the existing stacked cylinders, the structure of each cylinder body is different, especially the distribution positions of the threaded holes, bolt through holes and return air holes in each cylinder body are different. Therefore, each cylinder body needs to be customized and processed separately, which has high processing costs and low efficiency and is not suitable for mass production. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a modular cylinder body, which can be used to manufacture stacked cylinders, is suitable for large-scale processing and production, does not require individual customized processing, and can thereby reduce processing costs and improve processing efficiency.

[0005] In order to solve the above technical problems, the technical solution of the present utility model is: a modular cylinder body, comprising an outer peripheral cylinder wall;

[0006] The outer cylinder wall is provided with a first air return hole and a second air return hole;

[0007] The first air return hole and the second air return hole both extend in the axial direction;

[0008] The first air return hole and the second air return hole are 180° apart in the circumferential direction, and the distance from the first air return hole to the central axis of the outer peripheral cylinder wall is equal to the distance from the second air return hole to the central axis of the outer peripheral cylinder wall;

[0009] The outer cylinder wall is also provided with a plurality of threaded holes and bolt through holes corresponding to the threaded holes one by one;

[0010] The threaded hole and the bolt through hole both extend in the axial direction;

[0011] The threaded hole and the corresponding bolt through hole are 180° apart in the circumferential direction, and the distance between the threaded hole and the central axis of the outer peripheral cylinder wall is equal to the distance between the corresponding bolt through hole and the central axis of the outer peripheral cylinder wall;

[0012] A piston cavity is provided on the inner side of the outer peripheral cylinder wall. The piston cavity is communicated with the first air return hole through a first air passage, and the piston cavity is communicated with the second air return hole through a second air passage.

[0013] Furthermore, the front end of the outer peripheral cylinder wall is connected to an end cylinder wall extending radially inward, a rod hole is provided in the center of the end cylinder wall, and the piston cavity is located behind the end cylinder wall;

[0014] A portion of the first air channel is provided in the peripheral cylinder wall, another portion of the first air channel is provided in the end cylinder wall, a portion of the second air channel is provided in the peripheral cylinder wall, another portion of the second air channel is provided in the end cylinder wall.

[0015] Furthermore, a first dust blowing hole and a second dust blowing hole are provided in the outer peripheral cylinder wall;

[0016] The first dust-blowing air hole and the second dust-blowing air hole both extend in the axial direction;

[0017] The first dust-blowing hole and the second dust-blowing hole are 180° apart in the circumferential direction, and the distance from the first dust-blowing hole to the central axis of the peripheral cylinder wall is equal to the distance from the second dust-blowing hole to the central axis of the peripheral cylinder wall.

[0018] Furthermore, three threaded holes and three bolt through holes are provided on the outer peripheral cylinder wall, and the bolt through holes correspond to the threaded holes one by one.

[0019] Furthermore, the first air return hole is located at the 0° position, the second air return hole is located at the 180° position, the three threaded holes are located at the 30°, 150° and 270° positions respectively, and the three bolt through holes are located at the 90°, 210° and 330° positions respectively.

[0020] Furthermore, the first air return hole, the second air return hole, the threaded hole and the bolt through hole are all distributed on the same circumference with the central axis of the outer peripheral cylinder wall as the center.

[0021] The utility model also provides a superimposed cylinder automatic tool-changing electric spindle, comprising an electric spindle body and a superimposed cylinder;

[0022] The electric spindle body includes a shell;

[0023] The stacked cylinder includes a cylinder head and at least two modular cylinder bodies;

[0024] Wherein, the modular cylinders are arranged and connected in sequence from front to back;

[0025] Between any front and rear adjacent modular cylinders, the first air return hole in the front modular cylinder is aligned and connected with the second air return hole in the rear modular cylinder, the second air return hole in the front modular cylinder is aligned and connected with the first air return hole in the rear modular cylinder, the threaded hole in the front modular cylinder is aligned with the bolt through hole in the rear modular cylinder, and the connecting bolt passes through the bolt through hole in the rear modular cylinder and is screwed into the threaded hole in the front modular cylinder to connect the front and rear adjacent modular cylinders together;

[0026] The frontmost module cylinder is connected to the housing;

[0027] The cylinder head is connected to the rearmost module cylinder body.

[0028] Furthermore, the electric spindle body also includes a broaching rod;

[0029] The stacked cylinder also includes piston components corresponding one-to-one to the module cylinder bodies;

[0030] Wherein, the piston component includes a piston disc portion and a piston rod portion connected to the piston disc portion;

[0031] The piston disc portion is slidably disposed in the piston cavity of the corresponding module cylinder along the front-to-back direction, and the piston disc portion divides the corresponding piston cavity into a front chamber and a rear chamber, wherein the front chamber is connected to the first air return hole through the first air passage, and the front chamber is also connected to the second air return hole through the second air passage;

[0032] The piston rod portion extends forward and extends into the rear chamber of the module cylinder body adjacent to the front and abuts against the piston component adjacent to the front, and the frontmost piston rod portion extends forward and is connected to the broaching rod;

[0033] An air guide hole is also provided in the piston rod portion, the rear end portion of the air guide hole is communicated with the rear chamber in the corresponding module cylinder body, and the front end portion of the air guide hole is communicated with the rear chamber in the module cylinder body adjacent to the front.

[0034] Furthermore, the cylinder head is provided with a first air return nozzle aligned and connected with the first air return hole on the rearmost module cylinder body, and a second air return nozzle aligned and connected with the second air return hole on the rearmost module cylinder body.

[0035] Furthermore, the cylinder head is also provided with an air intake nozzle which is connected to the rear chamber in the rearmost module cylinder body.

[0036] After adopting the above technical solution, when using multiple modular cylinder bodies of the embodiments of the present application to manufacture a stacked cylinder, the first modular cylinder body is placed at the front end, and the second modular cylinder body is placed behind the first modular cylinder body, so that the second modular cylinder body is rotated 180° around the central axis. At this time, since the first return air hole and the second return air hole in each modular cylinder body are 180° apart in the circumferential direction, and the threaded hole and the corresponding bolt through hole in each modular cylinder body are 180° apart in the circumferential direction, the first return air hole in the second modular cylinder body will be aligned and connected with the second return air hole in the first modular cylinder body, and the second return air hole in the second modular cylinder body will be aligned and connected with the first return air hole in the first modular cylinder body, and the bolt through hole in the second modular cylinder body will be aligned with the corresponding threaded hole in the first modular cylinder body. At this time, a connecting bolt can be used to pass through the bolt through hole in the second modular cylinder body and then screwed into the threaded hole in the first modular cylinder body, thereby connecting the second modular cylinder body and the first modular cylinder body together. Specifically, the third module cylinder is then placed behind the second module cylinder, so that the third module cylinder maintains the same angle as the first module cylinder, and the third module cylinder is 180° apart from the second module cylinder. Therefore, the first return air hole in the third module cylinder is aligned and connected with the second return air hole in the second module cylinder, and the second return air hole in the third module cylinder is aligned and connected with the first return air hole in the second module cylinder. The bolt through-hole in the third module cylinder is aligned with the corresponding threaded hole in the second module cylinder. At this time, a connecting bolt can be used to pass through the bolt through-hole in the third module cylinder and then screwed into the threaded hole in the second module cylinder, thereby connecting the third module cylinder and the second module cylinder together. Similarly, when the fourth module cylinder needs to be installed, the fourth module cylinder is placed behind the third module cylinder, so that the fourth module cylinder maintains the same angle as the second module cylinder, and the fourth module cylinder is 180° apart from the third module cylinder. Then, the connecting bolt is used to connect the fourth module cylinder and the third module cylinder together. Similarly, the fifth module cylinder, the sixth module cylinder, etc. can also be installed. Adjacent module cylinders can be connected by connecting bolts as long as they are rotated 180 degrees apart and the first air holes and the second air holes can be alternately connected.

[0037] Compared with the prior art, the threaded holes, bolt holes, and air return holes on each cylinder body of the existing stacked cylinders are distributed at different positions. Therefore, the structure of each cylinder body in the existing stacked cylinders is different, and each cylinder body needs to be individually customized and processed, which has high processing costs and low efficiency, and is not suitable for mass production. In the stacked cylinders manufactured using the modular cylinder body of the embodiment of the present application, each cylinder body adopts the modular cylinder body of the embodiment of the present application, and the dimensions and specifications of each modular cylinder body are the same, especially the threaded holes, bolt holes, first air return holes, and second air return holes in each modular cylinder body are distributed at the same positions and are standardized. Therefore, the modular cylinder body can be mass-produced with the same standards and the same processing steps, without the need for individual customization and processing, thereby reducing processing costs and improving processing efficiency, and can reduce the manufacturing cost of the electric spindle by 20% and shorten the manufacturing cycle by 30%. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic structural diagram of the modular cylinder body of the present utility model;

[0039] Figure 2 This is a front view of the modular cylinder of the present utility model;

[0040] Figure 3 It is a cross-sectional view of the modular cylinder of the present utility model;

[0041] Figure 4 This is a schematic structural diagram of the modular cylinders of the present invention arranged in sequence;

[0042] Figure 5 This is a cross-sectional view of the superimposed cylinder automatic tool-changing electric spindle of the present utility model;

[0043] Figure 6 for Figure 5 Partial detail drawing. DETAILED DESCRIPTION

[0044] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0045] Example 1

[0046] like Figures 1 to 4 As shown, a modular cylinder body comprises an outer peripheral cylinder wall 1;

[0047] The outer cylinder wall 1 is provided with a first air return hole 2 and a second air return hole 3;

[0048] The first air return hole 2 and the second air return hole 3 both extend in the axial direction;

[0049] The first air return hole 2 and the second air return hole 3 are 180° apart in the circumferential direction, and the distance between the first air return hole 2 and the central axis of the peripheral cylinder wall 1 is equal to the distance between the second air return hole 3 and the central axis of the peripheral cylinder wall 1;

[0050] The outer cylinder wall 1 is further provided with a plurality of threaded holes 4 and bolt through holes 5 corresponding to the threaded holes 4 one by one;

[0051] The threaded hole 4 and the bolt through hole 5 both extend in the axial direction;

[0052] The threaded hole 4 and the corresponding bolt through hole 5 are 180° apart in the circumferential direction, and the distance between the threaded hole 4 and the central axis of the outer peripheral cylinder wall 1 is equal to the distance between the corresponding bolt through hole 5 and the central axis of the outer peripheral cylinder wall 1;

[0053] A piston chamber 6 is provided on the inner side of the outer peripheral cylinder wall 1 . The piston chamber 6 is communicated with the first air return hole 2 through a first air passage 7 , and the piston chamber 6 is communicated with the second air return hole 3 through a second air passage 8 .

[0054] Specifically, when a plurality of modular cylinder bodies 15 of the present application are used to manufacture a stacked cylinder 200, the first modular cylinder body 15 is placed at the front end, and the second modular cylinder body 15 is placed behind the first modular cylinder body 15, so that the second modular cylinder body 15 is rotated 180 degrees around the central axis. At this time, since the first air return hole 2 and the second air return hole 3 in each modular cylinder body 15 are 180 degrees apart in the circumferential direction, and the threaded hole 4 in each modular cylinder body 15 and the corresponding bolt through hole 5 are 180 degrees apart in the circumferential direction, the first air return hole 2 in the second modular cylinder body 15 is 180 degrees apart in the circumferential direction. The air hole 2 will be aligned and connected with the second air return hole 3 in the first module cylinder body 15, the second air return hole 3 in the second module cylinder body 15 will be aligned and connected with the first air return hole 2 in the first module cylinder body 15, and the bolt through hole 5 in the second module cylinder body 15 will be aligned with the corresponding threaded hole 4 in the first module cylinder body 15. At this time, the connecting bolt can be used to pass through the bolt through hole 5 in the second module cylinder body 15 and then screwed into the threaded hole 4 in the first module cylinder body 15, thereby connecting the second module cylinder body 15 and the first module cylinder body 15 together. Specifically, the third module cylinder body 15 is then placed behind the second module cylinder body 15, so that the third module cylinder body 15 maintains the same angle as the first module cylinder body 15, and then the third module cylinder body 15 and the second module cylinder body 15 will differ by 180°. Therefore, the first return air hole 2 in the third module cylinder body 15 will be aligned and connected with the second return air hole 3 in the second module cylinder body 15, and the second return air hole 3 in the third module cylinder body 15 will be aligned and connected with the first return air hole 2 in the second module cylinder body 15, and the bolt through hole 5 in the third module cylinder body 15 will be aligned with the corresponding threaded hole 4 in the second module cylinder body 15. At this time, the connecting bolt can be used to pass through the bolt through hole 5 in the third module cylinder body 15 and then screwed into the threaded hole 4 in the second module cylinder body 15, thereby connecting the third module cylinder body 15 and the second module cylinder body 15 together. Similarly, when the fourth modular cylinder 15 needs to be installed, the fourth modular cylinder 15 is placed behind the third modular cylinder 15, so that the fourth modular cylinder 15 maintains the same angle as the second modular cylinder 15, and thus there is a 180° difference between the fourth modular cylinder 15 and the third modular cylinder 15. Then, the fourth modular cylinder 15 and the third modular cylinder 15 are connected together using connecting bolts. Similarly, the fifth modular cylinder 15, the sixth modular cylinder 15, and so on can be installed. Adjacent modular cylinders 15 can be connected by connecting bolts as long as they are rotated 180° apart and can alternately connect the first air hole and the second air hole.

[0055] Compared with the prior art, the threaded holes 4, bolt holes 5, and air return holes on each cylinder body of the existing stacked cylinder 200 are distributed at different positions. Therefore, the structure of each cylinder body in the existing stacked cylinder 200 is different, and each cylinder body needs to be individually customized and processed, which has high processing costs and low efficiency, and is not suitable for mass production. In the stacked cylinder 200 manufactured using the modular cylinder body 15 of the embodiment of the present application, each cylinder body adopts the modular cylinder body 15 of the embodiment of the present application, and the dimensions and specifications of each modular cylinder body 15 are the same, especially the threaded holes 4, bolt holes 5, first air return holes 2, and second air return holes 3 in each modular cylinder body 15 are distributed at the same positions and are standardized. Therefore, the modular cylinder body 15 can be mass-produced with the same standards and the same processing steps, without the need for individual customization and processing, thereby reducing processing costs and improving processing efficiency, and can reduce the manufacturing cost of the electric spindle by 20% and shorten the manufacturing cycle by 30%.

[0056] like Figures 1 to 4 As shown, the front end of the outer peripheral cylinder wall 1 is connected to an end cylinder wall 9 extending radially inward, a rod hole 10 is provided in the center of the end cylinder wall 9, and the piston cavity 6 is located behind the end cylinder wall 9;

[0057] A portion of the first air channel 7 is provided in the peripheral cylinder wall 1 , and another portion of the first air channel 7 is provided in the end cylinder wall 9 .

[0058] A portion of the second air passage 8 is provided in the peripheral cylinder wall 1 , and another portion of the second air passage 8 is provided in the end cylinder wall 9 .

[0059] like Figures 1 to 4 As shown, the outer peripheral cylinder wall 1 is further provided with a first dust blowing hole 11 and a second dust blowing hole 12;

[0060] The first dust-blowing air hole 11 and the second dust-blowing air hole 12 both extend in the axial direction;

[0061] The first dust-blowing hole 11 and the second dust-blowing hole 12 are 180° apart in the circumferential direction, and the distance from the first dust-blowing hole 11 to the central axis of the peripheral cylinder wall 1 is equal to the distance from the second dust-blowing hole 12 to the central axis of the peripheral cylinder wall 1 .

[0062] like Figures 1 to 4 As shown, three threaded holes 4 and three bolt through holes 5 are provided on the outer peripheral cylinder wall 1 , and the bolt through holes 5 correspond to the threaded holes 4 one by one.

[0063] like Figures 1 to 4As shown, the first air return hole 2 is located at the 0° position, the second air return hole 3 is located at the 180° position, the three threaded holes 4 are located at the 30°, 150° and 270° positions respectively, and the three bolt through holes 5 are located at the 90°, 210° and 330° positions respectively.

[0064] like Figures 1 to 4 As shown, the first air return hole 2, the second air return hole 3, the threaded hole 4 and the bolt through hole 5, the first dust blowing hole 11 and the second dust blowing hole 12 are all distributed on the same circle with the central axis of the outer cylinder wall 1 as the center.

[0065] Example 2

[0066] like Figures 4-6 As shown, a superimposed cylinder automatic tool-changing electric spindle includes an electric spindle body 100 and a superimposed cylinder 200;

[0067] The electric spindle body 100 includes a housing 13;

[0068] The stacked cylinder 200 includes a cylinder head 14 and at least two modular cylinder bodies 15 as described in the first embodiment;

[0069] The modular cylinders 15 are arranged and connected in sequence from front to back;

[0070] Between any front and rear adjacent module cylinders 15, the first air return hole 2 in the front module cylinder 15 is aligned and connected with the second air return hole 3 in the rear module cylinder 15, the second air return hole 3 in the front module cylinder 15 is aligned and connected with the first air return hole 2 in the rear module cylinder 15, the threaded hole 4 in the front module cylinder 15 is aligned with the bolt through hole 5 in the rear module cylinder 15, and the connecting bolt passes through the bolt through hole 5 in the rear module cylinder 15 and is screwed into the threaded hole 4 in the front module cylinder 15, thereby connecting the front and rear adjacent module cylinders 15 together;

[0071] The frontmost module cylinder 15 is connected to the housing 13; specifically, the connecting bolt passes through the bolt through hole 5 in the frontmost module cylinder 15 and is screwed into the threaded hole 4 in the housing 13 to connect the frontmost module cylinder 15 to the housing 13;

[0072] The cylinder head 14 is connected to the rearmost module cylinder body 15 ; specifically, the connecting bolt passes through the bolt through hole 5 on the cylinder head 14 and is screwed into the threaded hole 4 in the rearmost module cylinder body 15 to connect the cylinder head 14 to the rearmost module cylinder body 15 .

[0073] In this embodiment, the stacking cylinder 200 is provided with three modular cylinders 15 . Each modular cylinder 15 has an identical structure, with adjacent modular cylinders 15 being 180° apart. This identical structure of each modular cylinder 15 facilitates mass production of the modular cylinders 15 , reducing production costs and improving production efficiency. Specifically, the user can stack any number of modular cylinders 15 based on the required thrust of the stacking cylinder 200 , and the broach spring 25 does not need to be replaced when stacking modular cylinders 15 .

[0074] like Figures 4-6 As shown, the electric spindle body 100 may further include a broaching rod 16;

[0075] The stacking cylinder 200 may further include a piston component corresponding one-to-one to the module cylinder body 15;

[0076] The piston component includes a piston disc portion 17 and a piston rod portion 18 connected to the piston disc portion 17;

[0077] The piston disc portion 17 is slidably disposed in the piston cavity 6 of the corresponding module cylinder body 15 along the front-to-back direction. The piston disc portion 17 divides the corresponding piston cavity 6 into a front chamber 19 and a rear chamber 20. The front chamber 19 is connected to the first air return hole 2 through the first air channel 7. The front chamber 19 is also connected to the second air return hole 3 through the second air channel 8.

[0078] The piston rod portion 18 extends forward and extends into the rear chamber 20 of the module cylinder 15 adjacent to the front and abuts against the piston component adjacent to the front. The frontmost piston rod portion 18 extends forward and is connected to the broaching rod 16.

[0079] An air guide hole 21 is also provided in the piston rod portion 18, the rear end portion of the air guide hole 21 is connected to the rear chamber 20 in the corresponding module cylinder body 15, and the front end portion of the air guide hole 21 is connected to the rear chamber 20 in the module cylinder body 15 adjacent to the front; in this embodiment, the air guide hole 21 is not provided in the frontmost piston rod portion 18.

[0080] like Figures 4-6 As shown, the cylinder head 14 is provided with a first return air nozzle 22 aligned and connected with the first return air hole 2 on the rearmost module cylinder body 15, and a second return air nozzle 23 aligned and connected with the second return air hole 3 on the rearmost module cylinder body 15; specifically, after the module cylinder bodies 15 are connected in sequence from front to back, the first return air hole 2 and the second return air hole 3 are alternately connected to form two return air passages 300, one of which is connected to the first return air nozzle 22, and the other is connected to the second return air nozzle 23.

[0081] like Figures 4-6 As shown, the cylinder head 14 is further provided with an air intake nozzle 24 which is in communication with the rear chamber 20 in the rearmost module cylinder body 15 .

[0082] During the knife placement process, air enters the air inlet nozzle 24, flows from the air inlet nozzle 24 into the rear chamber 20 of the rearmost module cylinder 15, and then flows through the air guide hole 21 into the rear chamber 20 of each module cylinder 15, thereby driving each piston component forward, and in turn, the tool broaching rod 16 forward to achieve knife placement. Furthermore, during the knife placement process, air in the front chamber 19 flows through the first and second air channels 7 and 8 into the two return air passages 300, and then out through the first and second return air nozzles 22 and 23. During the knife loading process, air enters the first and second return air nozzles 22 and 23, and then flows from the return air passages 300 through the first and second air channels 7 and 8 into the front chamber 19 of each module cylinder 15, thereby driving each piston component backward, and thus the tool broaching rod 16 backward to achieve knife loading. Simultaneously, the tool broaching spring 25 in the electric spindle body 100 also propels the tool broaching rod 16 backward through its elastic force. The stacking cylinder automatic tool-changing electric spindle of the embodiment of the present application is simple to install, has a stable air circuit, a large tool-changing thrust, a fast return speed, an auxiliary tool-pulling force on the return stroke, more reliable tool installation, and convenient and reliable stacking.

[0083] In summary, when a plurality of modular cylinder bodies 15 of the present application are used to manufacture a stacked cylinder 200, the first modular cylinder body 15 is placed at the front end, and the second modular cylinder body 15 is placed behind the first modular cylinder body 15, so that the second modular cylinder body 15 is rotated 180 degrees around the central axis. At this time, since the first air return hole 2 and the second air return hole 3 in each modular cylinder body 15 are 180 degrees apart in the circumferential direction, and the threaded hole 4 in each modular cylinder body 15 and the corresponding bolt through hole 5 are 180 degrees apart in the circumferential direction, the first air return hole 2 in the second modular cylinder body 15 is 180 degrees apart in the circumferential direction. The air hole 2 will be aligned and connected with the second air return hole 3 in the first module cylinder body 15, the second air return hole 3 in the second module cylinder body 15 will be aligned and connected with the first air return hole 2 in the first module cylinder body 15, and the bolt through hole 5 in the second module cylinder body 15 will be aligned with the corresponding threaded hole 4 in the first module cylinder body 15. At this time, the connecting bolt can be used to pass through the bolt through hole 5 in the second module cylinder body 15 and then screwed into the threaded hole 4 in the first module cylinder body 15, thereby connecting the second module cylinder body 15 and the first module cylinder body 15 together. Specifically, the third module cylinder body 15 is then placed behind the second module cylinder body 15, so that the third module cylinder body 15 maintains the same angle as the first module cylinder body 15, and then the third module cylinder body 15 and the second module cylinder body 15 will differ by 180°. Therefore, the first return air hole 2 in the third module cylinder body 15 will be aligned and connected with the second return air hole 3 in the second module cylinder body 15, and the second return air hole 3 in the third module cylinder body 15 will be aligned and connected with the first return air hole 2 in the second module cylinder body 15, and the bolt through hole 5 in the third module cylinder body 15 will be aligned with the corresponding threaded hole 4 in the second module cylinder body 15. At this time, the connecting bolt can be used to pass through the bolt through hole 5 in the third module cylinder body 15 and then screwed into the threaded hole 4 in the second module cylinder body 15, thereby connecting the third module cylinder body 15 and the second module cylinder body 15 together. Similarly, when the fourth modular cylinder 15 needs to be installed, the fourth modular cylinder 15 is placed behind the third modular cylinder 15, so that the fourth modular cylinder 15 maintains the same angle as the second modular cylinder 15, and thus there is a 180° difference between the fourth modular cylinder 15 and the third modular cylinder 15. Then, the fourth modular cylinder 15 and the third modular cylinder 15 are connected together using connecting bolts. Similarly, the fifth modular cylinder 15, the sixth modular cylinder 15, and so on can be installed. Adjacent modular cylinders 15 can be connected by connecting bolts as long as they are rotated 180° apart and can alternately connect the first air hole and the second air hole.

[0084] Compared with the prior art, the threaded holes 4, bolt holes 5, and air return holes on each cylinder body of the existing stacked cylinder 200 are distributed at different positions. Therefore, the structure of each cylinder body in the existing stacked cylinder 200 is different, and each cylinder body needs to be individually customized and processed, which has high processing costs and low efficiency, and is not suitable for mass production. In the stacked cylinder 200 manufactured using the modular cylinder body 15 of the embodiment of the present application, each cylinder body adopts the modular cylinder body 15 of the embodiment of the present application, and the dimensions and specifications of each modular cylinder body 15 are the same, especially the threaded holes 4, bolt holes 5, first air return holes 2, and second air return holes 3 in each modular cylinder body 15 are distributed at the same positions and are standardized. Therefore, the modular cylinder body 15 can be mass-produced with the same standards and the same processing steps, without the need for individual customization and processing, thereby reducing processing costs and improving processing efficiency, and can reduce the manufacturing cost of the electric spindle by 20% and shorten the manufacturing cycle by 30%.

[0085] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A modular cylinder, characterized in that: comprising an outer cylinder wall (1); The outer peripheral cylinder wall (1) is provided with a first air return hole (2) and a second air return hole (3); The first air return hole (2) and the second air return hole (3) both extend in the axial direction; The first air return hole (2) and the second air return hole (3) are 180° apart in the circumferential direction, and the distance from the first air return hole (2) to the central axis of the outer peripheral cylinder wall (1) is equal to the distance from the second air return hole (3) to the central axis of the outer peripheral cylinder wall (1); The outer peripheral cylinder wall (1) is further provided with a plurality of threaded holes (4) and bolt through holes (5) corresponding one to one to the threaded holes (4); The threaded hole (4) and the bolt through hole (5) both extend in the axial direction; The threaded hole (4) and the corresponding bolt through hole (5) are 180° apart in the circumferential direction, and the distance from the threaded hole (4) to the central axis of the outer peripheral cylinder wall (1) is equal to the distance from the corresponding bolt through hole (5) to the central axis of the outer peripheral cylinder wall (1); A piston chamber (6) is provided on the inner side of the outer peripheral cylinder wall (1), and the piston chamber (6) is communicated with the first air return hole (2) through a first air channel (7), and the piston chamber (6) is communicated with the second air return hole (3) through a second air channel (8).

2. The modular cylinder according to claim 1, characterized in that: The front end of the outer peripheral cylinder wall (1) is connected to an end cylinder wall (9) extending radially inward, a rod hole (10) is provided at the center of the end cylinder wall (9), and the piston chamber (6) is located behind the end cylinder wall (9); A portion of the first air channel (7) is provided in the peripheral cylinder wall (1), another portion of the first air channel (7) is provided in the end cylinder wall (9), a portion of the second air channel (8) is provided in the peripheral cylinder wall (1), another portion of the second air channel (8) is provided in the end cylinder wall (9).

3. The modular cylinder according to claim 1, characterized in that The outer peripheral cylinder wall (1) is further provided with a first dust blowing hole (11) and a second dust blowing hole (12); The first dust-blowing air hole (11) and the second dust-blowing air hole (12) both extend in the axial direction; The first dust-blowing hole (11) and the second dust-blowing hole (12) are 180° apart in the circumferential direction, and the distance from the first dust-blowing hole (11) to the central axis of the peripheral cylinder wall (1) is equal to the distance from the second dust-blowing hole (12) to the central axis of the peripheral cylinder wall (1).

4. The modular cylinder according to claim 1, characterized in that The outer peripheral cylinder wall (1) is provided with three threaded holes (4) and three bolt through holes (5), and the bolt through holes (5) correspond one to one to the threaded holes (4).

5. The modular cylinder according to claim 4, characterized in that: The first air return hole (2) is located at the 0° position, the second air return hole (3) is located at the 180° position, the three threaded holes (4) are respectively located at the 30°, 150° and 270° positions, and the three bolt through holes (5) are respectively located at the 90°, 210° and 330° positions.

6. The modular cylinder according to claim 1, characterized in that The first air return hole (2), the second air return hole (3), the threaded hole (4) and the bolt through hole (5) are all distributed on the same circumference with the central axis of the outer peripheral cylinder wall (1) as the center.

7. A superimposed cylinder automatic tool changing electric spindle, characterized in that: It comprises an electric spindle body (100) and a superposition cylinder (200); The electric spindle body (100) includes a housing (13); The stacked cylinder (200) comprises a cylinder head (14) and at least two modular cylinder bodies (15) according to any one of claims 1 to 6; Wherein, the modular cylinders (15) are arranged and connected in sequence from front to back; Between any front and rear adjacent module cylinders (15), the first air return hole (2) in the front module cylinder (15) is aligned and communicated with the second air return hole (3) in the rear module cylinder (15), the second air return hole (3) in the front module cylinder (15) is aligned and communicated with the first air return hole (2) in the rear module cylinder (15), the threaded hole (4) in the front module cylinder (15) is aligned with the bolt through hole (5) in the rear module cylinder (15), and the connecting bolt passes through the bolt through hole (5) in the rear module cylinder (15) and is screwed into the threaded hole (4) in the front module cylinder (15), thereby connecting the front and rear adjacent module cylinders (15) together; The frontmost module cylinder (15) is connected to the housing (13); The cylinder head (14) is connected to the rearmost module cylinder body (15).

8. The superimposed cylinder automatic tool-changing electric spindle according to claim 7, characterized in that: The electric spindle body (100) also includes a broaching rod (16); The stacking cylinder (200) further includes a piston component corresponding one-to-one to the module cylinder body (15); Wherein, the piston component comprises a piston disc portion (17) and a piston rod portion (18) connected to the piston disc portion (17); The piston disc portion (17) is slidably disposed in the piston chamber (6) in the corresponding module cylinder body (15) along the front-back direction, and the piston disc portion (17) divides the corresponding piston chamber (6) into a front chamber (19) and a rear chamber (20), wherein the front chamber (19) is connected to the first air return hole (2) through the first air channel (7), and the front chamber (19) is also connected to the second air return hole (3) through the second air channel (8); The piston rod portion (18) extends forward and extends into the rear chamber (20) in the module cylinder (15) adjacent to the front and abuts against the piston component adjacent to the front, and the frontmost piston rod portion (18) extends forward and is connected to the broaching rod (16); An air guide hole (21) is also provided in the piston rod portion (18), the rear end portion of the air guide hole (21) is connected to the rear chamber (20) in the corresponding module cylinder (15), and the front end portion of the air guide hole (21) is connected to the rear chamber (20) in the module cylinder (15) adjacent to the front.

9. The superimposed cylinder automatic tool-changing electric spindle according to claim 8, characterized in that: The cylinder cover (14) is provided with a first air return nozzle (22) aligned and connected with the first air return hole (2) on the rearmost module cylinder body (15), and a second air return nozzle (23) aligned and connected with the second air return hole (3) on the rearmost module cylinder body (15).

10. The superimposed cylinder automatic tool-changing electric spindle according to claim 8, characterized in that: The cylinder cover (14) is also provided with an air intake nozzle (24) which is in communication with the rear chamber (20) in the rearmost module cylinder body (15).

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