Numerical control milling machine based on field bus control

Abstract

The application relates to the technical field of numerical control milling machines, and discloses a numerical control milling machine based on field bus control, which comprises a protection box, a main shaft and a workbench, further comprises two fixed plates symmetrically arranged on the two sides of the main shaft, a collecting box is arranged at the lower part of the fixed plate, a protection shell in a C-shaped ring structure is arranged above the collecting box, an arc-shaped electromagnet is arranged in the protection shell, a negative pressure box in a C-shaped ring structure is fixedly connected to the top of the protection shell, a plurality of through holes are formed in the bottom surface of the negative pressure box and on the side facing the inner wall of the protection shell, and a negative pressure pipe is fixedly connected to the top surface of the negative pressure box. The arc-shaped electromagnet forms a strong magnetic field in the annular cover to adsorb the chippings generated by the milling, meanwhile, the negative pressure box forms directional air flow in the annular cover to adsorb and guide the floating metal powder, so that the capturing effect on the metal powder is ensured, the chippings generated by the milling are effectively collected, the chippings are prevented from splashing everywhere, and the working environment in the protection box and the equipment safety are ensured.

Description

Technical Field

[0001] This invention relates to the field of CNC milling machine technology, and more particularly to a CNC milling machine based on fieldbus control. Background Technology

[0002] Fieldbus control technology, as the core of modern industrial automation, is gradually integrating deeply with small CNC milling machines to build a highly integrated and intelligent control architecture. This technology replaces traditional complex parallel wiring with a single communication cable, connecting servo drives, I / O modules, and various peripheral devices into a unified network. This not only greatly simplifies machine tool wiring and improves system reliability and scalability, but also enables comprehensive data acquisition and interaction from the machine tool's underlying devices, laying a solid foundation for advanced function development.

[0003] However, in the crucial chip removal stage, existing small CNC milling machines still largely rely on traditional pneumatic chip blowing methods, creating a significant gap in compatibility with the intelligent advantages of fieldbus control, thus becoming a bottleneck restricting the improvement of processing efficiency and accuracy. Traditional pneumatic chip blowing devices mostly adopt fixed air path layouts and simple switch controls, lacking linkage and coordination with the CNC system, resulting in several prominent shortcomings: First, the airflow direction and pressure are fixed, and the coverage area is limited, making it difficult to completely remove chips from hidden areas such as workpiece grooves, deep cavities, and complex contours. Residual chips can easily invade precision transmission components such as guide rails and lead screws, aggravating wear and causing positioning errors, seriously affecting the long-term accuracy and stability of the machine tool; Second, during the blowing process, chips are prone to splashing and spreading everywhere, polluting the workshop environment and potentially adhering to the surfaces of electrical components such as CNC system panels and sensors, causing signal interference, short circuits, and other malfunctions; At the same time, high-speed airflow may cause displacement of lightweight workpieces or small parts, compromising machining positioning accuracy, further restricting the processing quality and efficiency of small CNC milling machines. Summary of the Invention

[0004] In view of the problem that existing technologies for CNC milling machines have difficulty in completely removing chips caused by pneumatic chip blowing, a CNC milling machine based on fieldbus control is proposed.

[0005] The purpose is to use a detachable annular cover on the outside of the drill bit. When the annular cover is closed, it uses a combination of electromagnetic adsorption and negative pressure adsorption to adsorb the generated debris, preventing the debris from splashing and spreading.

[0006] The technical solution of this invention is a CNC milling machine based on fieldbus control, including a protective box, a spindle, a worktable, and communication cables for controlling the spindle and worktable. It also includes two fixing plates symmetrically distributed on both sides of the spindle. The fixing plates are fixedly installed on the inner wall of the protective box. A collection box is placed under the fixing plate. A protective shell with a C-shaped ring structure is set above the collection box. An arc-shaped electromagnet is set inside the protective shell. A negative pressure box with a C-shaped ring structure is fixedly connected to the top of the protective shell. Multiple through holes are opened on the bottom surface of the negative pressure box and on the side facing the inner wall of the protective shell. A negative pressure pipe is fixedly connected to the top surface of the negative pressure box. The negative pressure pipe passes through the protective box and is connected to an external negative pressure device. The arc-shaped electromagnet and the external negative pressure device are both signal connected to the fieldbus control module. A connecting rod is fixedly connected to the outer wall of the protective shell. A slider is slidably sleeved on the upper end of the connecting rod. A drive arm is slidably sleeved on the slider. The drive arm is arranged horizontally and one end is fixed to the outer wall of the transmission box of the main shaft. A guide hole in the shape of a zigzag line is opened on the fixed plate. The slider slides in cooperation with the guide hole.

[0007] Furthermore, a support leg is fixedly connected to one corner of the fixing plate, and the support leg is fixedly connected to the inner wall of the protective box. A placement platform is fixedly connected to the lower part of the other side of the fixing plate, and a groove adapted to the collection box is provided on the placement platform.

[0008] Furthermore, the inner wall of the outer arc side of the protective shell is provided with silicon steel sheets.

[0009] Furthermore, the multiple through holes are distributed in an arc shape with equal spacing, and the through holes are set at an acute angle to the axis of the negative pressure box; A filter screen is installed inside the negative pressure box on the side facing the through hole.

[0010] Furthermore, a guide wheel is rotatably disposed within the guide hole, and the guide wheel is rotatably connected to the slider.

[0011] Furthermore, the bottom of the protective shell is fixedly connected with multiple limiting seats in an arc shape at equal intervals, and ball bearings are rolled inside the limiting seats; A guide rod is fixedly connected to the upper part of the connecting rod, and the other end of the guide rod is slidably connected to the slider. A spring is sleeved on the outer wall of the guide rod, and the two ends of the spring are respectively connected to the connecting rod and the slider.

[0012] Furthermore, a conical block is fixedly connected to the bottom surface of the negative pressure box. The conical block, together with the protective shell and the negative pressure box, forms a negative pressure cavity. The cross-section of the negative pressure cavity is a right-angled trapezoidal structure.

[0013] Furthermore, a clearance groove is provided on the side of the conical block near the main shaft, the inner diameter of the lower port of the clearance groove is larger than the inner diameter of the upper port, and multiple air guide holes communicating with the clearance groove are provided on the conical block.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The protective shell and the spindle move synchronously to form an annular cover on the outside of the drill bit. Inside the annular cover, a strong magnetic field is generated by an arc electromagnet to attract the chips generated by turning and milling. At the same time, the negative pressure box creates a directional airflow inside the annular cover to attract and guide the floating metal powder, ensuring the capture effect of metal powder. This achieves effective collection of chips, prevents chips generated by turning and milling from flying everywhere, and protects the working environment and equipment safety inside the protective box.

[0015] 2. The obliquely arranged through holes create a spiral airflow inside the annular cover. In conjunction with the conical block, this enhances the rotation speed of the airflow, allowing the floating metal powder to be thrown onto the inner arc sidewall of the arc electromagnet under stronger centrifugal force, further improving the capture effect of the metal powder.

[0016] 3. The combination of the clearance groove and the air guide hole allows the spiral airflow generated when the drill bit rotates to meet the spiral airflow generated by the through hole, amplifying the spiral strength and flow rate of the airflow, strengthening the directional pushing force on the metal powder, and allowing fine dust to gather more efficiently towards the inner arc sidewall of the arc electromagnet. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a front view schematic diagram of the spindle and fixing plate structure of the present invention; Figure 3 This is a schematic diagram showing the disassembled structure of the fixing plate and the collection box of the present invention; Figure 4 This is a schematic diagram of the drive arm, connecting rod, and protective shell structure of the present invention; Figure 5 This is a schematic cross-sectional view of the slider structure of the present invention; Figure 6 This is a schematic diagram of the protective shell and arc-shaped electromagnet structure of the present invention; Figure 7 This is a schematic diagram showing the disassembled structure of the protective shell of the present invention; Figure 8 This is a schematic diagram showing the disassembled structure of the negative pressure box of the present invention; Figure 9 This is a cross-sectional schematic diagram of the protective shell and negative pressure box structure of the present invention.

[0018] In the picture: 1. Protective box; 2. Spindle; 3. Worktable; 4. Fixing plate; 5. Support leg; 6. Placement platform; 7. Collection box; 8. Protective shell; 9. Arc electromagnet; 10. Silicon steel sheet; 11. Negative pressure box; 12. Through hole; 13. Negative pressure pipe; 14. Connecting rod; 15. Slider; 16. Drive arm; 17. Guide hole; 18. Guide wheel; 19. Filter screen; 20. Limit seat; 21. Ball bearing; 22. Guide rod; 23. Spring; 24. Conical block; 25. Negative pressure chamber; 26. Relief groove; 27. Air guide hole. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Example 1, referring to Figures 1-6 This is the first embodiment of the present invention, which provides a CNC milling machine based on fieldbus control, including a protective housing 1, a spindle 2, a worktable 3, and communication cables for controlling the spindle 2 and the worktable 3. It also includes two fixing plates 4 symmetrically distributed on both sides of the spindle 2. The fixing plates 4 are fixedly installed to the inner wall of the protective housing 1. A collection box 7 is placed at the lower part of the fixing plates 4, and a protective shell 8 with a C-shaped ring structure is arranged above the collection box 7. An arc-shaped electromagnet 9 is installed inside the protective shell 8. A negative pressure box 11 with a C-shaped ring structure is fixedly connected to the top of the protective shell 8, with the bottom surface of the negative pressure box 11 facing inwards towards the protective shell 8. Multiple through holes 12 are provided on one side of the wall. A negative pressure pipe 13 is fixedly connected to the top surface of the negative pressure box 11. The negative pressure pipe 13 passes through the protective box 1 and is connected to the external negative pressure equipment. The arc-shaped electromagnet 9 and the external negative pressure equipment are both connected to the fieldbus control module signal. A connecting rod 14 is fixedly connected to the outer wall of the protective shell 8. A slider 15 is slidably sleeved on the upper end of the connecting rod 14. A drive arm 16 is slidably sleeved on the slider 15. The drive arm 16 is arranged horizontally and one end is fixed to the outer wall of the transmission box of the main shaft 2. A guide hole 17 in the shape of a zigzag line is provided on the fixing plate 4. The slider 15 slides with the guide hole 17.

[0021] Specifically, the drive arm 16 moves up and down synchronously with the transmission box of the spindle 2. When the spindle 2 drives the drill bit to descend, the drive arm 16 and the slider 15 work together to drive the connecting rod 14 and the protective shell 8 to descend. The slider 15 moves along the direction of the guide hole 17 until the two protective shells 8 merge to form an annular cover, which is fitted onto the outside of the drill bit. When the drill bit is performing milling and turning, the fieldbus control module synchronously sends control signals to the arc electromagnet 9 and the external negative pressure device to control the arc electromagnet 9 to generate an annular magnetic field. Under the action of the magnetic field force, large particles of debris generated by milling and turning are quickly attracted to the inner arc sidewall of the arc electromagnet 9. At the same time, the external negative pressure device forms a stable negative pressure inside the negative pressure box 11 through the negative pressure pipe 13. The bottom surface of the negative pressure box 11 faces the protective shell. Multiple through holes 12 on the inner wall of the protective shell 8 simultaneously adsorb air from the annular cover, forming a directional airflow. This causes metal dust floating in the air to flow with the airflow, which not only improves the capture efficiency of the magnetic field for light debris, but also achieves timely and comprehensive collection of various debris generated by turning and milling through the synergistic effect of magnetic force and negative pressure. This effectively avoids debris splashing and diffusion, ensures a clean working environment inside the protective box 1, and prevents debris from causing signal interference or malfunctions to drive equipment, sensors and other components. At the same time, it avoids displacement of small parts or light workpieces caused by high-speed airflow and debris impact, thereby ensuring the machining positioning accuracy and long-term operational stability of the machine tool. It fully adapts to the intelligent advantages of fieldbus control and makes up for the shortcomings of traditional chip blowing methods.

[0022] When the main shaft 2 rises and resets, the two protective shells 8 separate and return to the corresponding collection box 7. At this time, the magnetic field and negative pressure are disconnected, and the adsorbed debris falls onto the collection box 7 for timely cleaning.

[0023] The arc-shaped electromagnet 9 is connected to the fieldbus control network via a bus-type digital output (DO) module and a bus-type analog input (AI) module. When the CNC parses the "start chip collection" instruction, it sends an "ON" signal to the DO module via the fieldbus. The electromagnet is energized, generating a strong magnetic field. When machining is complete or the adsorbed chips need to be removed, the CNC sends an "OFF" signal, the electromagnet is de-energized, and the magnetic field disappears. An external negative pressure device (usually a vacuum generator controlled by a solenoid valve or a vacuum pump) is connected to the fieldbus control network via a bus-type analog output (AO) module and a bus-type digital input (DI) module. The CNC can dynamically adjust the power of the negative pressure device via the AO module according to the machining stage (e.g., rough milling, finish milling) and material type. The start and stop of the negative pressure device are linked to the electromagnet's action; the electromagnet starts instantaneously before being energized and shuts down with a delay after being de-energized, ensuring that all light chips are completely removed.

[0024] Reference Figure 3One side corner of the fixed plate 4 is fixedly connected with a support leg 5, which is connected and fixed to the inner wall of the protective box 1. The lower part of the other side of the fixed plate 4 is fixedly connected with a placement platform 6, which has a groove that matches the collection box 7.

[0025] Specifically, the collection box 7 is placed in the groove of the placement table 6. The groove and the matching structure of the collection box 7 achieve stable positioning, effectively preventing the collection box 7 from shifting due to vibration during machine tool processing. At the same time, this placement method does not require additional fixing parts, making it easy for operators to quickly pick up and put down the collection box 7, so as to clean the debris collected inside in time and ensure the continuous and stable operation of the debris collection system.

[0026] Reference Figure 7 The inner wall of the outer arc side of the protective shell 8 is provided with silicon steel sheet 10.

[0027] Specifically, the silicon steel sheet 10 provided on the inner wall of the outer arc side of the protective shell 8 has the characteristic of strongly guiding magnetic lines of force, which can make the magnetic lines of force generated by the arc electromagnet 9 preferentially form a closed loop along the inside of the silicon steel sheet 10, thereby firmly confining the magnetic field inside the annular cover formed after the two protective shells 8 are combined, effectively preventing the magnetic field from leaking outward, preventing electromagnetic interference to precision equipment and sensors on CNC milling machines, and ensuring the operational stability and control accuracy of the equipment.

[0028] Reference Figure 8 Multiple through holes 12 are distributed in an arc shape at equal intervals, and the through holes 12 are set at an acute angle to the axis of the negative pressure box 11; a filter screen 19 is provided inside the negative pressure box 11 on the side facing the through holes 12.

[0029] Specifically, when a negative pressure is formed inside the negative pressure box 11, the bottom surface of the through hole 12 draws in air from the annular cover at an angle. The combined effect of multiple angled through holes 12 creates a spiral upward directional airflow inside the annular cover. Metal dust floating in the air is thrown onto the inner arc sidewall of the arc electromagnet 9 by the centrifugal force generated by the airflow, significantly enhancing the capture efficiency of light metal dust. Meanwhile, the filter screen 19 set inside the negative pressure box 11 facing the through hole 12 can effectively intercept fine dust that is not captured by the magnetic field, preventing it from being discharged through the negative pressure pipe 13 or entering the external negative pressure equipment. This ensures the comprehensiveness of debris collection, prevents dust from polluting the external environment and damaging the negative pressure equipment, and further improves the cleanliness and operational stability of the system.

[0030] Understandably, after the negative pressure box 11 has been working for a period of time, an external negative pressure device blows air back onto the negative pressure box 11 to remove the dust clogging the filter screen 19, ensuring the effective filtration of the filter screen 19.

[0031] Example 2, refer to Figure 3 , Figure 5This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that a guide wheel 18 is rolled inside the guide hole 17, and the guide wheel 18 is rotatably connected to the slider 15.

[0032] Specifically, the upper part of the guide hole 17 is inclined and the lower part is vertical. The guide wheel 18 inside is rotatably connected to the slider 15. When the drive arm 16 descends with the transmission box of the main shaft 2, the guide wheel 18 slides down along the upper inclined section of the guide hole 17, and simultaneously drives the connecting rod 14 to move in an inclined manner, so that the protective shell 8 gradually separates from the collection box 7 and moves towards the drill bit. When the guide wheel 18 slides to the lower vertical section of the guide hole 17, the two protective shells 8 precisely merge to form an annular cover, and then descend vertically with the drill bit and are fitted on the outside of the drill bit. The rolling cooperation between the guide wheel 18 and the guide hole 17 reduces the frictional resistance when the slider 15 moves, and ensures the smoothness and accuracy of the opening, closing and lifting of the protective shell 8, ensuring reliable linkage and coordination with the main shaft 2.

[0033] Reference Figure 4 , Figure 6 The bottom of the protective shell 8 is fixedly connected with multiple limit seats 20 at equal intervals in an arc shape, and a ball bearing 21 is rolled inside the limit seat 20; a guide rod 22 is fixedly connected to the upper part of the connecting rod 14, and the other end of the guide rod 22 is slidably connected to the slider 15. A spring 23 is sleeved on the outer wall of the guide rod 22, and the two ends of the spring 23 are connected to the connecting rod 14 and the slider 15 respectively.

[0034] Specifically, the elastic cooperation between the guide rod 22 and the spring 23 enables the ball bearing 21 to form an elastic contact with the top surface of the workpiece. On the one hand, when the worktable 3 moves the workpiece, the rolling action of the ball bearing 21 prevents scratches on the material surface, ensuring the appearance quality of the workpiece. On the other hand, it adapts to the flatness of the top surface of the workpiece, ensuring that the bottom of the protective shell 8 and the top surface of the workpiece always maintain a fixed distance, thus ensuring a stable and uniform airflow environment inside the annular cover and improving the capture effect of debris and dust. The remaining structure is the same as that in Embodiment 1.

[0035] Example 3, referring to Figure 6 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that a conical block 24 is fixedly connected to the bottom surface of the negative pressure box 11. The conical block 24, together with the protective shell 8 and the negative pressure box 11, forms a negative pressure cavity 25. The cross-section of the negative pressure cavity 25 is a right-angled trapezoidal structure.

[0036] Specifically, the cone-shaped block 24 has a bottom height higher than the bottom height of the protective shell 8. When the two protective shells 8 are combined to form an annular cover, the two cone-shaped blocks 24 are simultaneously spliced ​​into a cone-shaped guide cover. This guide cover can actively guide the debris generated by milling and turning to gather towards the inner arc sidewall of the arc electromagnet 9. At the same time, the cone-shaped block 24, the protective shell 8, and the negative pressure box 11 cooperate to form a negative pressure cavity 25 with a right-angled trapezoidal cross-section. The special structure of the negative pressure cavity 25 can guide and accelerate the airflow during the spiral airflow as it rises, significantly increasing the speed of the upper airflow, thereby enhancing the centrifugal force generated by the airflow, strengthening the throwing effect on metal powder, and allowing more fine dust to be adsorbed onto the surface of the arc electromagnet 9, effectively improving the capture efficiency of debris and dust.

[0037] Reference Figure 6 , Figure 9 The tapered block 24 has a relief groove 26 on the side near the main shaft 2. The inner diameter of the lower port of the relief groove 26 is larger than the inner diameter of the upper port, and the tapered block 24 has a plurality of air guide holes 27 that communicate with the relief groove 26.

[0038] Specifically, the inner diameter of the lower port of the clearance groove 26 is smaller than the outer diameter of the drill bit, providing ample space for the drill bit to rotate. When the drill bit rotates at high speed, the spiral groove on its surface will generate a combined force of "axial pushing + circumferential rotation", forcing the surrounding air to form a spiral airflow along the spiral groove trajectory. After passing through the air guide hole 27, this airflow superimposes with the original spiral airflow in the annular cover, further pushing the metal powder closer to the inner arc sidewall of the arc electromagnet 9, significantly improving the capture efficiency of fine metal powder, avoiding dust suspension or residue, and further ensuring the comprehensiveness and stability of debris collection.

[0039] The clearance groove 26 adopts an opening structure design that is larger at the top and smaller at the bottom, which can guide the outside air to enter smoothly from its upper opening. At the same time, as the lower space of the clearance groove 26 gradually shrinks, the spiral airflow formed around it when the drill bit rotates at high speed is gradually squeezed and then forced to be discharged in a direction through the air guide hole 27, so that the airflow can be accurately merged into the spiral airflow in the same direction inside the annular cover.

[0040] It should be noted that the spiral airflow direction formed by the through hole 12 is the same as that formed by the drill bit. This unidirectional design avoids the two airflows from canceling each other out. After the spiral airflow generated by the rotation of the drill bit passes through the air guide hole 27, it forms a synergistic superposition effect with the spiral airflow guided by the through hole 12. This amplifies the spiral intensity and velocity of the airflow and strengthens the directional pushing force on the metal powder, allowing fine dust to more efficiently gather towards the inner arc sidewall of the arc electromagnet 9. The rest of the structure is the same as that of Embodiment 2.

[0041] Based on embodiments 1-3, the working principle of this invention is as follows: During machining, the spindle 2 drives the drill bit to descend, and the drive arm 16 synchronously links with the slider 15, causing the guide wheel 18 to slide through the guide hole 17. The two protective shells 8 gradually converge and merge into an annular cover, which is fitted onto the outside of the drill bit. The fieldbus control module synchronously triggers the arc electromagnet 9 and the external negative pressure device. The arc electromagnet 9 generates an annular magnetic field, and the negative pressure device forms a stable negative pressure in the negative pressure box 11 through the negative pressure pipe 13. Multiple oblique through holes 12 guide the formation of a spiral airflow inside the annular cover. Large particles of debris generated during milling are directly adsorbed by the magnetic field, while fine metal dust is thrown to the inner wall of the electromagnet under the centrifugal force of the airflow. After machining is completed, the spindle 2 rises, the protective shell 8 separates and resets above the collection box 7, and the magnetic field and the negative pressure device are shut down in sequence. The adsorbed debris falls into the collection box 7, achieving centralized cleaning.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A CNC milling machine based on fieldbus control, comprising a protective housing (1), a spindle (2), a worktable (3), and a communication cable for controlling the spindle (2) and the worktable (3), characterized in that, It also includes two symmetrically distributed fixing plates (4) on both sides of the main shaft (2). The fixing plates (4) are fixed to the inner wall of the protective box (1). A collection box (7) is placed at the bottom of the fixing plates (4). A protective shell (8) with a C-shaped ring structure is set above the collection box (7). An arc electromagnet (9) is set inside the protective shell (8). A negative pressure box (11) with a C-shaped ring structure is fixedly connected to the top of the protective shell (8). Multiple through holes (12) are opened on the bottom surface of the negative pressure box (11) and on the side facing the inner wall of the protective shell (8). A negative pressure pipe (13) is fixedly connected to the top surface of the negative pressure box (11). The negative pressure pipe (13) passes through the protective box (1) and is connected to the external negative pressure equipment. The arc electromagnet (9) and the external negative pressure equipment are both connected to the fieldbus control module signal. A connecting rod (14) is fixedly connected to the outer wall of the protective shell (8). A slider (15) is slidably sleeved on the upper end of the connecting rod (14). A driving arm (16) is slidably sleeved on the slider (15). The driving arm (16) is arranged horizontally and one end is fixed to the outer wall of the transmission box of the main shaft (2). A guide hole (17) in the shape of a broken line is opened on the fixing plate (4). The slider (15) slides in cooperation with the guide hole (17).

2. The CNC milling machine based on fieldbus control according to claim 1, characterized in that, One side corner of the fixed plate (4) is fixedly connected with a support leg (5), which is connected and fixed to the inner wall of the protective box (1). The lower part of the other side of the fixed plate (4) is fixedly connected with a placement platform (6), which has a groove that is compatible with the collection box (7).

3. The CNC milling machine based on fieldbus control according to claim 1, characterized in that, The protective shell (8) has a silicon steel sheet (10) on the inner wall of the outer arc side.

4. The CNC milling machine based on fieldbus control according to claim 1, characterized in that, The multiple through holes (12) are distributed in an arc shape at equal intervals, and the through holes (12) are set at an acute angle to the axis of the negative pressure box (11); A filter screen (19) is provided inside the negative pressure box (11) on the side facing the through hole (12).

5. The CNC milling machine based on fieldbus control according to claim 1, characterized in that, A guide wheel (18) is rolled inside the guide hole (17), and the guide wheel (18) is rotatably connected to the slider (15).

6. The CNC milling machine based on fieldbus control according to claim 1, characterized in that, The bottom of the protective shell (8) is fixedly connected with multiple limiting seats (20) at equal intervals in an arc shape, and a ball bearing (21) is rolled inside the limiting seat (20). A guide rod (22) is fixedly connected to the upper part of the connecting rod (14). The other end of the guide rod (22) is slidably connected to the slider (15). A spring (23) is sleeved on the outer wall of the guide rod (22). The two ends of the spring (23) are connected to the connecting rod (14) and the slider (15) respectively.

7. The CNC milling machine based on fieldbus control according to claim 1, characterized in that, A conical block (24) is fixedly connected to the bottom surface of the negative pressure box (11). The conical block (24), together with the protective shell (8) and the negative pressure box (11), forms a negative pressure cavity (25). The cross-section of the negative pressure cavity (25) is a right-angled trapezoidal structure.

8. The CNC milling machine based on fieldbus control according to claim 7, characterized in that, The conical block (24) has a relief groove (26) on the side near the main shaft (2). The inner diameter of the lower port of the relief groove (26) is larger than the inner diameter of the upper port, and the conical block (24) has a plurality of air guide holes (27) connected to the relief groove (26).

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