CNC (computer numerical control) built-in grinding device

Abstract

The utility model discloses a CNC (computer numerical control) machine interior polishing device, which belongs to the technical field of CNC machining and comprises a cutter handle with a limiting groove, a first fixing plate with a first through groove and a second through groove, a positioning pin, a sleeve and an elastic piece, the cutter handle is arranged in the first through groove, and the second through groove comprises a first groove body and a second groove body communicated with the first groove body. The projection of the second groove body on the first groove body in the length extending direction of the cutter handle is located on the first groove body. The sleeve comprises a limiting piece matched with the limiting groove and a barrel body connected with the limiting piece, the barrel body sequentially penetrates through the first groove body and the second groove body, a first through hole and a second through hole communicated with the first through hole are formed in the barrel body, and the projection of the second through hole on the positioning pin in the length extension direction of the positioning pin is located on the positioning pin; the elastic piece is arranged outside the cylinder in a sleeving mode, one end of the elastic piece is located between the first through hole and the first groove body, and the other end of the elastic piece is used for making contact with the limiting piece. The polishing device achieves the technical effect of improving the polishing efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of CNC machining, and particularly relates to a CNC in-machine grinding device. Background Art

[0002] Due to its high precision, high efficiency and automation characteristics, CNC machine tools are widely used in the machining and manufacturing of various complex parts. With the continuous improvement of machining accuracy and the increasing complexity of the workpieces being machined, the traditional tool replacement and grinding methods can no longer meet the requirements of modern machining. Currently, during the machining process of CNC machine tools, it is difficult to achieve automatic tool change within the CNC machine tool, and it is impossible to efficiently complete in-machine grinding of products, resulting in low grinding efficiency.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is the technical problem of low grinding efficiency.

[0005] To solve the above technical problem, the utility model provides a CNC in-machine grinding device, which includes: a tool holder with a limit groove, a first fixing plate with a first through groove and a second through groove, a positioning pin, a sleeve and an elastic member. The tool holder is arranged in the first through groove. The second through groove includes a first groove body and a second groove body communicating with the first groove body. The projection of the second groove body along the length extension direction of the tool holder on the first groove body is located on the first groove body. The sleeve includes a limiting member matching the limit groove and a cylinder body connected to the limiting member. The cylinder body sequentially penetrates through the first groove body and the second groove body. The cylinder body is provided with a first through hole and a second through hole communicating with the first through hole. The positioning pin is embedded in the first through hole. The projection of the second through hole along the length extension direction of the positioning pin on the positioning pin is located on the positioning pin. The elastic member is sleeved outside the cylinder body. One end of the elastic member is located between the first through hole and the first groove body, and the other end of the elastic member is used to contact the limiting member.

[0006] Optionally, the positioning pin is provided with a sealing groove located in the first through hole. The CNC in-machine grinding device further includes a sealing ring, and the sealing ring is embedded in the sealing groove, and the sealing groove is annular.

[0007] Optionally, the in-CNC machine grinding device further includes: two limit pins respectively disposed on the first fixed plate, the two limit pins are respectively located on both sides of the limiting member, the limiting member moves along the length extension direction of the limit pins, and the limiting member is located between the limiting groove and the first fixed plate, and the projection of the limiting member along the length extension direction of the limit pins in the limiting groove is located within the limiting groove.

[0008] Optionally, the in-CNC machine grinding device further includes: a second fixed plate and a grinding machine, the second fixed plate is connected to the tool shank; the grinding machine is connected to the second fixed plate.

[0009] Optionally, the in-CNC machine grinding device further includes: a first limiting block, the first limiting block is sleeved on the tool shank, and the first limiting block is connected to the first fixed plate, and the second fixed plate is located between the first limiting block and the grinding machine.

[0010] Optionally, the in-CNC machine grinding device further includes: a bearing disposed in the first through groove, the tool shank is connected to the bearing, and the first limiting block is located between the bearing and the second fixed plate.

[0011] Optionally, the in-CNC machine grinding device further includes: a third fixed plate and a first air pipe joint, the positioning pin is connected to the third fixed plate; the first air pipe joint is connected to the third fixed plate.

[0012] Optionally, the in-CNC machine grinding device further includes: a second air pipe joint, the second air pipe joint is connected to the cylinder body, and the second air pipe joint is communicated with the second through hole, so as to form an air delivery channel through the first air pipe joint, the third fixed plate, the positioning pin, the cylinder body and the second air pipe joint.

[0013] Optionally, the in-CNC machine grinding device further includes: a second limiting block, the second limiting block is sleeved on the cylinder body, the second limiting block is connected to the first fixed plate, and the second limiting block is located between the second air pipe joint and the first fixed plate.

[0014] Optionally, the in-CNC machine grinding device further includes: a CNC main shaft, the CNC main shaft is respectively connected to the tool shank and the third fixed plate.

[0015] Beneficial effects:

[0016] The present utility model provides a CNC in-machine grinding device. The tool holder is arranged in a first through groove located on a first fixing plate. The second through groove on the first fixing plate includes a first groove body and a second groove body. The second groove body communicates with the first groove body. The projection of the second groove body along the length extension direction of the tool holder on the first groove body is located on the first groove body. The limiting member of the sleeve matches the limiting groove, and the limiting member can be embedded into the limiting groove. The cylinder body is connected to the limiting member. The cylinder body sequentially penetrates through the first groove body and the second groove body of the second through groove. The cylinder body is provided with a first through hole and a second through hole, and the second through hole communicates with the first through hole. The positioning pin is embedded inside the first through hole. The projection of the second through hole along the length extension direction of the positioning pin on the positioning pin is located on the positioning pin. The elastic member is sleeved outside the cylinder body. One end of the elastic member is located between the first through hole and the first groove body, and the other end of the elastic member is used to contact the limiting member. In this way, when the positioning pin pushes the limiting member of the sleeve to move in a direction away from the limiting groove of the tool holder, the limiting member is separated from the limiting groove, and after the fixing of the tool holder is released, the tool holder can freely rotate in the first through groove, facilitating automatic tool change. When the positioning pin pushes the limiting member of the sleeve to move in a direction close to the limiting groove of the tool holder, the limiting member will be embedded into the limiting groove. At this time, the limiting member limits the position of the tool holder, so that the tool holder is in a fixed position in the first through groove, ensuring the stability during the grinding process. At the same time, when the positioning pin pushes the limiting member of the sleeve to move in a direction away from the limiting groove of the tool holder, the elastic member will be continuously compressed. The elastic force of the elastic member causes the positioning pin and the cylinder body of the sleeve to be clamped tightly, maintaining the air passage between the positioning pin and the cylinder body, and then improving the grinding efficiency, and enabling grinding at any angle around the outer shape of the product. Thus, the technical effect of improving the grinding efficiency is achieved. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of a CNC in-machine grinding device provided by an embodiment of the present utility model.

[0019] Figure 2 It is a schematic structural diagram of a limiting groove in a CNC in-machine grinding device provided by an embodiment of the present utility model.

[0020] Figure 3 It is a schematic structural diagram of a sleeve in a CNC in-machine grinding device provided by an embodiment of the present utility model.

[0021] Figure 4Schematic diagram of the structure of the second through groove in a CNC in-machine grinding device provided by an embodiment of the present utility model.

[0022] Figure 5 Schematic diagram of the structure of the first fixing plate in a CNC in-machine grinding device provided by an embodiment of the present utility model.

[0023] The meanings of the reference numerals in the drawings are as follows:

[0024] 1—Tool shank, 11—Limit groove; 2—First fixing plate, 21—First through groove, 22—Second through groove, 221—First groove body, 222—Second groove body; 3—Positioning pin, 31—Sealing groove; 4—Sleeve, 41—Limiting member, 42—Cylinder body; 5—Elastic member; 6—Sealing ring; 7—Limit pin; 8—Second fixing plate; 9—Grinder; 10—First limiting block; 101—Bearing; 102—Third fixing plate; 103—First air pipe joint; 104—Second air pipe joint; 105—Second limiting block; 106—CNC main shaft; 107—Product. Detailed implementation manners

[0025] The following details the implementation manners of the present application. The examples of the implementation manners are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The implementation manners described below with reference to the drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.

[0026] In order to enable those skilled in the art of the present technology to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present application.

[0027] In the embodiments of the present application, "at least one" means one or more; "a plurality" means two or more. In the description of the present application, words such as "first", "second", and "third" are only used for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor as indicating or implying order.

[0028] References to "one embodiment" or "some embodiments" or the like described in this specification mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, the terms "including", "comprising", "having" and their variants in this specification mean "including but not limited to" unless otherwise specifically emphasized. It should be noted that in the embodiments of the present application, "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone.

[0029] It should be noted that in the embodiments of the present invention, when a component is referred to as "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. Also, in the embodiments of the present application, "connection" can also be understood as electrical connection, and the connection of two electrical components can be a direct or indirect connection between the two electrical components. For example, when A is connected to B, it can be a direct connection between A and B or an indirect connection between A and B through one or more other electrical components. The terms "vertical", "horizontal", "left", "right" and similar expressions used in the embodiments of the present invention are only for illustrative purposes and are not intended to limit the present invention.

[0030] A CNC in-machine grinding device provided by an embodiment of the present invention, please refer to Figures 1 to 5 as shown Figure 1 is a schematic structural diagram of a CNC in-machine grinding device provided by an embodiment of the present invention, Figure 2 is a schematic structural diagram of the limiting groove 11 in a CNC in-machine grinding device provided by an embodiment of the present invention, Figure 3 is a schematic structural diagram of the sleeve 4 in a CNC in-machine grinding device provided by an embodiment of the present invention, Figure 4 is a schematic structural diagram of the second through groove 22 in a CNC in-machine grinding device provided by an embodiment of the present invention, Figure 5It is a schematic structural diagram of the first fixing plate 2 in a CNC in-machine grinding device provided by an embodiment of the present invention. An in-machine grinding device provided by an embodiment of the present invention includes a tool shank 1, a first fixing plate 2, a positioning pin 3, a sleeve 4, and an elastic member 5. The tool shank 1 is provided with a limiting groove 11, the first fixing plate 2 is provided with a first through groove 21 and a second through groove 22. The tool shank 1 is arranged in the first through groove 21 of the first fixing plate 2. The second through groove 22 includes a first groove body 221 and a second groove body 222. The second groove body 222 communicates with the first groove body 221. The projection of the second groove body 222 along the length extension direction of the tool shank 1 on the first groove body 221 is located on the first groove body 221, so that the inner diameter of the second groove body 222 is smaller than the inner diameter of the first groove body 221. The limiting member 41 of the sleeve 4 matches with the limiting groove 11, and the limiting member 41 can be embedded in the limiting groove 11. The cylinder body 42 is connected to the limiting member 41. The cylinder body 42 sequentially passes through the first groove body 221 and the second groove body 222 of the second through groove 22. The cylinder body 42 is provided with a first through hole and a second through hole, and the second through hole communicates with the first through hole. The positioning pin 3 is embedded inside the first through hole. The projection of the second through hole along the length extension direction of the positioning pin 3 on the positioning pin 3 is located on the positioning pin 3, so that the inner diameter of the second through hole is smaller than the inner diameter of the first through hole. The positioning pin 3 is clamped in the first through hole. The elastic member 5 is sleeved outside the cylinder body 42. One end of the elastic member 5 is located between the first through hole and the first groove body 221, and the other end of the elastic member 5 is used to contact the limiting member 41.

[0031] Among them, the elastic member 5 includes a spring. The elastic member 5 can ensure that sufficient elastic force is generated when the positioning pin 3 pushes the sleeve 4, so that the positioning pin 3 is tightly clamped with the cylinder body 42 of the sleeve 4. The inside of the positioning pin 3 has a channel for conveying gas, and the gas can flow in the inside of the positioning pin 3, the first groove body 221 and the second groove body 222. The gas can be conveyed to the following grinding machine 9 through the inside of the positioning pin 3, the first groove body 221 and the second groove body 222. When it is necessary to push the limiting member 41 of the sleeve 4 by the positioning pin 3 to move in a direction away from the limiting groove 11 of the tool shank 1, the positioning pin 3 can be manually pressed to make the positioning pin 3 move downward, or driving devices such as a motor or a cylinder can be used to push the positioning pin 3 downward. After the limiting member 41 is separated from the limiting groove 11, the tool shank 1 can rotate freely to move the following grinding machine 9 to the required spatial position to automatically replace the grinding head of the grinding machine 9. After the replacement is completed, the position of the tool shank 1 is fixed by tightly clamping the limiting member 41 and the limiting groove 11. The following grinding machine 9 connected to the tool shank 1 can be communicated with the inside of the positioning pin 3 through a pipeline to supply gas to the following grinding machine 9, and the following grinding machine 9 grinds the product 107. The product 107 includes a mobile phone middle frame, etc.

[0032] In this embodiment, the tool holder 1 is arranged in the first through groove 21 of the first fixing plate 2. The second through groove 22 of the first fixing plate 2 includes a first groove body 221 and a second groove body 222. The second groove body 222 communicates with the first groove body 221. The projection of the second groove body 222 along the length extension direction of the tool holder 1 on the first groove body 221 is located on the first groove body 221. The limiting member 41 of the sleeve 4 matches with the limiting groove 11. The limiting member 41 can be embedded into the limiting groove 11. The cylinder body 42 is connected to the limiting member 41. The cylinder body 42 sequentially penetrates through the first groove body 221 and the second groove body 222 of the second through groove 22. The cylinder body 42 is provided with a first through hole and a second through hole. The second through hole communicates with the first through hole. The positioning pin 3 is embedded into the interior of the first through hole. The projection of the second through hole along the length extension direction of the positioning pin 3 on the positioning pin 3 is located on the positioning pin 3. The elastic member 5 is sleeved outside the cylinder body 42. One end of the elastic member 5 is located between the first through hole and the first groove body 221. The other end of the elastic member 5 is used to contact with the limiting member 41. In this way, when the positioning pin 3 pushes the limiting member 41 of the sleeve 4 to move in a direction away from the limiting groove 11 of the tool holder 1, the limiting member 41 is separated from the limiting groove 11. After releasing the fixation of the tool holder 1, the tool holder 1 can freely rotate in the first through groove 21, which is convenient for automatic tool change. When the positioning pin 3 pushes the limiting member 41 of the sleeve 4 to move in a direction close to the limiting groove 11 of the tool holder 1, the limiting member 41 will be embedded into the limiting groove 11. At this time, the limiting member 41 limits the position of the tool holder 1, so that the tool holder 1 is in a fixed position in the first through groove 21, ensuring the stability during the grinding process. At the same time, when the positioning pin 3 pushes the limiting member 41 of the sleeve 4 to move in a direction away from the limiting groove 11 of the tool holder 1, the elastic member 5 will be continuously compressed. The elastic force of the elastic member 5 makes the positioning pin 3 and the cylinder body 42 of the sleeve 4 tightly clamped, keeping the air path between the positioning pin 3 and the cylinder body 42 unblocked. Then, the grinding efficiency is improved, and the outer shape of the product 107 can be ground at any angle. Thus, the technical effect of improving the grinding efficiency is achieved.

[0033] As an implementation manner, the positioning pin 3 is provided with a sealing groove 31. The sealing groove 31 is located inside the first through hole. A CNC machine internal grinding device provided by an embodiment of the present invention further includes a sealing ring 6. The sealing ring 6 is embedded into the sealing groove 31. The sealing groove 31 is in a ring shape. When the positioning pin 3 is embedded into the cylinder body 42 of the sleeve 4, the sealing ring 6 is closely attached between the sealing groove 31 and the cylinder body 42, effectively preventing gas leakage, ensuring the tightness of the air path or liquid path system of the CNC machine internal grinding device, and enhancing the reliability and safety of the device.

[0034] As an implementation manner, a CNC in-machine grinding device provided by an embodiment of the present utility model further includes two limit pins 7. The two limit pins 7 are respectively arranged on the first fixing plate 2. The two limit pins 7 are respectively located on both sides of the limiting member 41. The limiting member 41 moves along the length extension direction of the limit pin 7, and the limiting member 41 is located between the limiting groove 11 and the first fixing plate 2. The projection of the limiting member 41 along the length extension direction of the limit pin 7 on the limiting groove 11 is located inside the limiting groove 11. The two limit pins 7 provide accurate guiding and limiting functions for the limiting member 41, effectively preventing the limiting member 41 from shifting or shaking during the movement, making the fixing and unlocking processes of the tool holder 1 smoother and more accurate.

[0035] As an implementation manner, a CNC in-machine grinding device provided by an embodiment of the present utility model further includes a second fixing plate 8 and a grinding machine 9. The second fixing plate 8 is connected to the tool holder 1, and the grinding machine 9 is connected to the second fixing plate 8. The second fixing plate 8 provides support and stability for the grinding machine 9, and the grinding machine 9 is used for actual grinding operations on the product 107.

[0036] In some implementation manners, a CNC in-machine grinding device provided by an embodiment of the present utility model further includes a first limiting block 10. The first limiting block 10 is sleeved on the tool holder 1, and the first limiting block 10 is connected to the first fixing plate 2. The second fixing plate 8 is located between the first limiting block 10 and the grinding machine 9. The first limiting block 10 provides additional limiting and supporting functions for the tool holder 1, effectively preventing the tool holder 1 from shifting or shaking due to uneven force during the grinding process, not only improving the grinding accuracy and stability, but also extending the service life of the tool holder 1 and the entire device.

[0037] In some implementation manners, a CNC in-machine grinding device provided by an embodiment of the present utility model further includes a bearing 101. The bearing 101 is arranged in the first through groove 21. The tool holder 1 is connected to the bearing 101. The first limiting block 10 is located between the bearing 101 and the second fixing plate 8. The bearing 101 reduces the frictional resistance and energy consumption of the tool holder 1 during rotation, making the rotation of the tool holder 1 smoother and more efficient, improving the grinding efficiency, reducing the heat and wear generated by friction, and extending the service life of the tool holder 1 and the bearing 101.

[0038] In some implementation manners, a CNC in-machine grinding device provided by an embodiment of the present utility model further includes a third fixing plate 102 and a first air pipe joint 103. The positioning pin 3 is connected to the third fixing plate 102, and the first air pipe joint 103 is connected to the third fixing plate 102. A connection channel with an external air source is established through the third fixing plate 102 and the first air pipe joint 103. The first air pipe joint 103 enables gas to smoothly enter the device interior, providing a stable air source for subsequent grinding operations.

[0039] In some embodiments, a CNC in-machine grinding device provided by an embodiment of the present utility model further includes a second air pipe joint 104. The second air pipe joint 104 is connected to the cylinder body 42 and communicates with the second through hole, so as to form an air delivery channel through the first air pipe joint 103, the third fixing plate 102, the positioning pin 3, the cylinder body 42 and the second air pipe joint 104. The second air pipe joint 104 enables gas to smoothly enter the device from an external air source through the first air pipe joint 103, then pass through the positioning pin 3 and the cylinder body 42, and finally be output to the grinding machine 9 through the first air pipe joint 103, ensuring the stability and continuity of gas supply and providing a reliable air source guarantee for the grinding operation.

[0040] In some embodiments, a CNC in-machine grinding device provided by an embodiment of the present utility model further includes a second limiting block 105. The second limiting block 105 is sleeved on the cylinder body 42, the second limiting block 105 is connected to the first fixing plate 2, and the second limiting block 105 is located between the second air pipe joint 104 and the first fixing plate 2. The second limiting block 105 provides additional limiting and supporting effects for the cylinder body 42, effectively preventing the cylinder body 42 from shaking and shifting during movement or operation. At the same time, the connection between the second limiting block 105 and the first fixing plate 2 also strengthens the structural strength of the device, making the entire grinding device more stable and reliable during operation.

[0041] In some embodiments, a CNC in-machine grinding device provided by an embodiment of the present utility model further includes a CNC main shaft 106. The CNC main shaft 106 is respectively connected to the tool holder 1 and the third fixing plate 102. The automatic control function of the CNC main shaft 106 makes the grinding operation more convenient and efficient. In actual work, after the CNC machine tool automatically changes the tool, the positioning pin 3 will push the sleeve 4 downward as a whole, and the sleeve 4 and the limiting groove 11 of the tool holder 1 are in a non-contact state, so that when the CNC main shaft 106 rotates, there is no interference between the tool holder 1 and the device. The sleeve 4 uses the spring force of the elastic member 5 to make the sleeve 4 and the sealing ring 6 provided on the positioning pin 3 in a stuck state, which can ensure that the air path at the air delivery channel formed by the CNC main shaft 106, the first air pipe joint 103, the third fixing plate 102, the positioning pin 3, the cylinder body 42 and the second air pipe joint 104 can smoothly lead to the grinding machine 9, ensuring that the air pipe does not need to be unplugged when changing the tool. In addition, the pneumatic grinding machine 9 can rotate at any angle following the rotation of the CNC main shaft 106 through code. The pneumatic grinding machine 9 is driven independently through the air path, and the tool holder 1 is driven by the CNC main shaft 106 to rotate 360° to realize grinding at any angle of the outer circumference of the product 107.

[0042] Finally, it should be noted that the above specific implementation manners are only used to illustrate the technical solutions of the present utility model rather than to limit them. Although the present utility model has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and all of them should be covered within the scope of the claims of the present utility model.

Claims

1. A grinding device inside a CNC machine, characterized in that, The in-CNC machine grinding device includes: a tool holder with a limit groove, a first fixing plate with a first through groove and a second through groove, a positioning pin, a sleeve and an elastic member. The tool holder is disposed in the first through groove. The second through groove includes a first groove body and a second groove body communicating with the first groove body. The projection of the second groove body on the first groove body along the length extension direction of the tool holder is located on the first groove body. The sleeve includes a limiting member matching the limit groove and a cylinder body connected to the limiting member. The cylinder body sequentially penetrates through the first groove body and the second groove body. The cylinder body is provided with a first through hole and a second through hole communicating with the first through hole. The positioning pin is embedded in the first through hole. The projection of the second through hole on the positioning pin along the length extension direction of the positioning pin is located on the positioning pin. The elastic member is sleeved outside the cylinder body. One end of the elastic member is located between the first through hole and the first groove body, and the other end of the elastic member is used to contact the limiting member.

2. The CNC in-machine grinding device according to claim 1, characterized in that: The positioning pin is provided with a sealing groove, and the sealing groove is located in the first through hole. The in-CNC machine grinding device further includes a sealing ring, and the sealing ring is embedded in the sealing groove, and the sealing groove is annular.

3. The CNC in-machine grinding device according to claim 1, characterized in that, The in-CNC machine grinding device further includes: two limiting pins respectively disposed on the first fixing plate. The two limiting pins are respectively located on two sides of the limiting member. The limiting member moves along the length extension direction of the limiting pin, and the limiting member is located between the limit groove and the first fixing plate. The projection of the limiting member on the limit groove along the length extension direction of the limiting pin is located in the limit groove.

4. The CNC in-machine grinding device according to claim 1, characterized in that, The in-CNC machine grinding device further includes: a second fixing plate and a grinding machine. The second fixing plate is connected to the tool holder. The grinding machine is connected to the second fixing plate.

5. The CNC in-machine grinding device according to claim 4, characterized in that, The in-CNC machine grinding device further includes: a first limiting block, and the first limiting block is sleeved on the tool holder and the first limiting block is connected to the first fixing plate. The second fixing plate is located between the first limiting block and the grinding machine.

6. The CNC in-machine grinding device according to claim 5, characterized in that, The in-CNC machine grinding device further includes: a bearing disposed in the first through groove, and the tool holder is connected to the bearing. The first limiting block is located between the bearing and the second fixing plate.

7. The CNC in-machine grinding device according to claim 1, wherein The in-CNC machine grinding device further includes: a third fixing plate and a first air pipe joint. The positioning pin is connected to the third fixing plate. The first air pipe joint is connected to the third fixing plate.

8. The CNC in-machine grinding device according to claim 7, characterized in that, The in-CNC machine grinding device further includes: a second air pipe joint, and the second air pipe joint is connected to the cylinder body and the second air pipe joint communicates with the second through hole, so as to form an air delivery channel through the first air pipe joint, the third fixing plate, the positioning pin, the cylinder body and the second air pipe joint.

9. The CNC in-machine grinding device according to claim 8, characterized in that, The in-CNC machine grinding device further includes: a second limiting block, and the second limiting block is sleeved on the cylinder body. The second limiting block is connected to the first fixing plate, and the second limiting block is located between the second air pipe joint and the first fixing plate.

10. The CNC in-machine grinding device according to claim 7, characterized in that, The internal grinding device in the CNC machine further includes: a CNC spindle, and the CNC spindle is respectively connected to the tool holder and the third fixing plate.

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