Engraving and milling combined numerical control machine tool

Abstract

The invention relates to the technical field of engraving and milling machining, in particular to an engraving and milling composite numerical control machine tool which comprises a machine tool base, a double-shaft driving mechanism and a lifting mechanism are arranged on the machine tool base, a clamping table is arranged on the double-shaft driving mechanism, a multi-disc machining mechanism is arranged on the lifting mechanism, and the multi-disc machining mechanism comprises an upper support. A lower support is fixed at the bottom of the upper support; the switching motor is started according to process requirements, so that the upper butt joint block and the lower butt joint block of the specified engraving and milling cutter head are mutually nested, and the upper butt joint blocks and the lower butt joint blocks on other cutters are kept in a separated state, the automatic cutter changing process is achieved, the tedious operation of manual cutter changing is avoided, the auxiliary time is saved, and the working efficiency is improved. And the positioning deviation caused by manual tool changing is eliminated, the consistency of tool references in multi-procedure combined machining is ensured, the overall machining efficiency and the product size precision are effectively improved, and diversified engraving and milling combined machining requirements are met.

Description

Technical Field

[0001] This invention belongs to the field of engraving and milling technology, and specifically relates to an engraving and milling composite CNC machine tool. Background Technology

[0002] Milling and engraving composite machining technology is widely used in industries such as mold manufacturing, furniture decoration, advertising production, and precision parts processing. Its core requirement is to complete multiple processes such as milling and engraving in a single setup, balancing processing efficiency and precision. Existing milling and engraving equipment typically uses manual tool changing to adapt to diverse composite machining needs. However, manual tool changing suffers from problems such as cumbersome operation, long auxiliary time, and large positioning deviations, which seriously affect processing efficiency and product consistency. At the same time, chips easily adhere to the cutting tools during processing. Existing chip removal methods mostly involve stopping the machine after processing for cleaning or directly changing the tool, which not only reduces production efficiency but may also affect the accuracy of subsequent processing due to chip residue, or even damage the cutting edge of the tool. Therefore, it is necessary to design a milling and engraving composite CNC machine tool. Summary of the Invention

[0003] The purpose of this invention is to provide a simple and rationally designed CNC engraving and milling composite machine tool to solve the above-mentioned problems.

[0004] The present invention achieves the above objectives through the following technical solutions: A CNC engraving and milling composite machine tool includes a machine tool base. A dual-axis drive mechanism and a lifting mechanism are mounted on the machine tool base. A clamping table is mounted on the dual-axis drive mechanism. A multi-disc machining mechanism is mounted on the lifting mechanism. The multi-disc machining mechanism includes an upper support, a lower support fixed to the bottom of the upper support, and an outer support rotatably connected between the lower and upper supports. A switching mechanism is mounted on the outer support. A central gear is rotatably connected to the top center of the lower support and is mounted on a transmission mechanism. A docking drive mechanism is mounted on the lower support. The docking drive mechanism includes multiple drive gears rotatably connected to the lower support. These drive gears mesh with the central gear and are fixedly sleeved on a drive sleeve. A slag-removing mechanism is mounted within the drive sleeve. A lower docking block is fixed to the top of the drive sleeve. An inner sealing plate is fixed to the inner wall of the drive sleeve and slidably connected to an engraving and milling cutter head. The engraving and milling cutter head is fixed to the upper docking block, which is connected to the switching mechanism.

[0005] As a further optimization of the present invention, the switching mechanism includes a side slot formed on the inner wall of the outer support, a protrusion slidably connected in the side slot, and the protrusion fixed on the floating plate.

[0006] As a further optimization of the present invention, the floating plate is slidably connected to the lower support, and the upper connecting block is rotatably connected to the floating plate.

[0007] As a further optimization of the present invention, a toothed ring is fixedly sleeved on the top of the outer support, the toothed ring meshes with an upper gear, the upper gear is fixedly sleeved on the output end of the switching motor, and the switching motor is fixed on the upper support.

[0008] As a further optimization of the present invention, an air extraction mechanism is provided on the top of the upper support. The air extraction mechanism includes an industrial vacuum cleaner fixed on the upper support. The input end of the industrial vacuum cleaner is connected to the lower housing through a connecting pipe, and the lower housing is fixed at the bottom edge of the lower support.

[0009] As a further optimization of the present invention, the transmission mechanism includes a drive shaft fixedly connected to a central gear, the drive shaft being rotatably connected in a support sleeve, an upper support fixed to the bottom of the support sleeve, the support sleeve being fixedly installed on a lifting frame, a transmission motor being fixedly installed on the top of the lifting frame, a first roller being fixedly sleeved on the output end of the transmission motor, a second roller being fixedly sleeved on the drive shaft, and belts being installed on the first roller and the second roller.

[0010] As a further optimization of the present invention, the slag cleaning mechanism includes a mounting groove formed on the inner wall of the drive sleeve, a mounting frame fixed in the mounting groove, and a brush head provided on the side of the mounting frame near the engraving cutter head.

[0011] As a further optimization of the present invention, the lifting mechanism includes a fixed frame fixed on the machine tool base, a lifting screw rotatably connected in the fixed frame, the lifting screw fixedly connected to the output end of the lifting motor, the lifting motor fixed on the fixed frame, the lifting frame slidably connected to the fixed frame, and the lifting frame connected to the lifting screw.

[0012] As a further optimization of the present invention, the dual-axis drive mechanism includes a first lead screw rotatably connected in the machine tool base, a first motor fixed on one side of the machine tool base, the output end of the first motor fixedly connected to one end of the first lead screw, and a transverse frame provided on the first lead screw, which is slidably connected to the machine tool base.

[0013] As a further optimization of the present invention, the transverse frame is slidably connected to the clamping table, a second motor is fixed on the transverse frame, a second lead screw is fixedly connected to the output end of the second motor, the second lead screw is rotatably connected in the transverse frame, and the clamping table is connected to the second lead screw.

[0014] The beneficial effects of this invention are as follows: 1. This invention starts the switching motor according to process requirements, drives the outer support to rotate through the meshing of the upper gear and the gear ring. The side groove of the inner wall of the outer support drives the floating plate to rise and fall through the protrusion block, so that the upper docking block and the lower docking block of the designated engraving and milling cutter head are nested together, while the upper docking block and the lower docking block of the other cutters remain separated, realizing the automatic tool changing process. This avoids the tedious operation of manual tool changing, saves auxiliary time, and eliminates the positioning deviation caused by manual tool changing. It ensures the consistency of tool reference in multi-process composite machining, effectively improves the overall processing efficiency and product dimensional accuracy, and adapts to diverse engraving and milling composite machining needs.

[0015] 2. During the processing stage of this invention, the engraving and milling cutter head can rotate at high speed. Since the upper and lower connecting blocks are detached from each other, the other engraving and milling cutter heads can be in the drive sleeve without power. During processing, the transmission motor drives all drive sleeves to rotate synchronously through the central gear and drive gear. The brush head of the cleaning mechanism inside the drive sleeve forms relative motion with the cutting edge of the tool, continuously cleaning the residual chips on the tool. This not only avoids chip accumulation affecting subsequent processing, but also eliminates the need to interrupt processing for separate cleaning, greatly improving the continuity of processing. It is especially suitable for long-term, multi-process composite processing scenarios.

[0016] 3. During the processing of this invention, the industrial vacuum cleaner transmits negative pressure to the lower housing fixed at the bottom of the lower support through the connecting pipe, forming a one-way air extraction channel. The chips and dust generated during the engraving and milling process are directly sucked into the channel under the action of negative pressure. This not only avoids the accumulation of chips on the surface of the workpiece, which affects the processing accuracy, but also prevents the dust from escaping into the surrounding environment, polluting the air and harming the health of the operators. At the same time, the inner sealing plate works in conjunction with the air extraction mechanism to prevent chips from entering the drive sleeve, thus avoiding chip wear on transmission components such as gears and bearings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the dual-axis drive mechanism and lifting mechanism in this invention; Figure 3 This is a partial three-dimensional structural diagram of the present invention; Figure 4 This is a schematic diagram of the air extraction mechanism in this invention; Figure 5 This is a schematic diagram of the switching mechanism in this invention; Figure 6 This is a schematic diagram of the external support structure in this invention; Figure 7 This is a schematic diagram of the docking drive mechanism in this invention; Figure 8 This is an exploded view of the docking drive mechanism in this invention; Figure 9This is an assembly diagram of the docking drive mechanism in this invention.

[0018] In the diagram: 1. Machine tool base; 2. Dual-axis drive mechanism; 3. Lifting mechanism; 4. Clamping table; 5. Multi-disc machining mechanism; 6. Engraving and milling cutter head; 21. First motor; 22. Transverse frame; 23. Second motor; 31. Fixed frame; 32. Lifting screw; 33. Lifting motor; 50. Center gear; 51. Upper support; 52. Lower support; 53. Outer support; 54. Switching mechanism; 55. Transmission mechanism; 56. Docking drive mechanism; 57. Slag removal mechanism; 58. Air extraction mechanism; 541. Side slot; 542. Convex... 543. Lifting block; 544. Floating plate; 545. Gear ring; 546. Upper gear; 547. Switching motor; 551. Drive shaft; 552. Support sleeve; 553. Lifting frame; 554. Transmission motor; 555. Belt; 561. Drive gear; 562. Drive sleeve; 563. Lower connecting block; 564. Upper connecting block; 565. Inner sealing plate; 571. Mounting slot; 572. Mounting bracket; 581. Industrial vacuum cleaner; 582. Lower housing; 5411. Horizontal section; 5412. Wave section; 5413. Inclined section. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0020] Example: Please refer to Figures 1-9A CNC engraving and milling composite machine tool includes a machine base 1, on which a dual-axis drive mechanism 2 and a lifting mechanism 3 are mounted. The lifting mechanism 3 includes a fixed frame 31 fixed to one side of the top of the machine base 1. A lifting screw 32 is rotatably connected to the fixed frame 31 via bearings. The top end of the lifting screw 32 is fixedly connected to the output end of a lifting motor 33, which is fixed to the fixed frame 31. A multi-disc machining mechanism 5 is mounted on the fixed frame 31. The multi-disc machining mechanism 5 is equipped with engraving and milling cutter heads 6. The multi-disc machining mechanism 5 is used to carry multiple sets of engraving and milling cutter heads 6. The composite machining process can be completed automatically by tool changing without manual tool changing, effectively improving processing efficiency and adapting to diverse processing needs. The dual-axis drive mechanism 2 includes a first lead screw rotatably connected to the machine tool base 1. A first motor 21 is fixed to one side of the machine tool base 1. The output end of the first motor 21 is fixedly connected to one end of the first lead screw. A transverse frame 22 is provided on the first lead screw. The transverse frame 22 is connected to the first lead screw through an internally embedded ball nut. The transverse frame 22 is slidably connected to the machine tool base 1. A clamping table 4 for fixing the workpiece is slidably connected to the transverse frame 22. A second motor 23 is fixed to the transverse frame 22. The output end of the second motor 23 is fixedly connected to a second lead screw. The second lead screw is rotatably connected to the transverse frame 22 through a bearing. The clamping table 4 is connected to the second lead screw through an internally embedded ball nut.

[0021] During processing, the operator fixes the workpiece to be processed on the clamping table 4. The first motor 21 drives the first lead screw to rotate, which can drive the clamping table 4 and the workpiece to move laterally through the transverse frame 22. The second motor 23 drives the second lead screw to rotate, which can drive the workpiece to move longitudinally along the transverse frame 22 through the clamping table 4, and adjust the horizontal position of the workpiece. At the same time, the lifting motor 33 drives the lifting lead screw 32 to rotate, and adjusts the multi-disc processing mechanism 5 and the engraving and milling cutter head 6 to move up and down, so as to realize multi-dimensional processing.

[0022] Please see Figures 3-9The multi-disc machining mechanism 5 includes a transmission mechanism 55, which includes a lifting frame 553 connected to a lifting screw 32 via ball nuts. The lifting frame 553 is slidably connected to a fixed frame 31. A support sleeve 552 is fixed on the lifting frame 553. A drive shaft 551 is rotatably connected to the support sleeve 552 via bearings. A central gear 50 is fixedly connected to the bottom of the drive shaft 551. A drive motor 554 is fixed to the top of the lifting frame 553. A first roller is fixed to the output end of the drive motor 554. A second roller is fixed to the top of the drive shaft 551. A belt 555 is tensioned on the first and second rollers. An upper support 51 is fixed to the bottom of the support sleeve 552. A lower support 52 is fixed to the bottom of the upper support 51. The lower support 52 consists of a bottom plate and multiple sets of longitudinal support rods. The support rods are fixedly inserted into the upper support 51. An outer support 53 is rotatably connected between the lower support 52 and the upper support 51. A switching mechanism 54 for tool changing is provided on the outer support 53. The central gear 50 is rotatably connected to the top center of the lower support 52. The lower support 52 is provided with a docking drive mechanism 56, which includes multiple drive gears 561 rotatably connected to the lower support 52. The multiple drive gears 561 are circumferentially distributed, and all drive gears 561 are meshed with the central gear 50. The drive gears 561 are fixedly sleeved on the drive sleeve 562. The drive sleeve 562 is provided with a slag cleaning mechanism 57. The top of the drive sleeve 562 is fixed with a lower docking block 563 by bolts. An inner sealing plate 565 is fixed on the inner wall of the drive sleeve 562. The inner sealing plate 565 is slidably connected to the engraving cutter head 6. The engraving cutter head 6 is fixed on the upper docking block 564. The protrusion at the bottom of the upper docking block 564 corresponds to the groove at the bottom of the lower docking block 563. When the upper docking block 564 and the lower docking block 563 are fully nested, the upper docking block 564 and the lower docking block 563 can rotate synchronously. The upper docking block 564 is connected to the switching mechanism 54.The switching mechanism 54 includes a side slot 541 formed on the inner wall of the outer support 53. The side slot 541 includes a horizontal section 5411 at a lower position and a undulating section 5412 at a higher position. The two ends of the undulating section 5412 are interconnected with the horizontal section 5411 through an inclined section 5413. A spherical protrusion 542 is slidably connected in the side slot 541. The protrusion 542 is fixed to the side wall of the floating plate 543. The floating plate 543 is slidably connected to the support rod of the lower support 52. When the protrusion 542 on the floating plate 543 is in the horizontal section 5411, the upper docking block 564 and the lower docking block 563 are completely connected. The system is fully nested. When the protrusion 542 is in the undulating segment 5412, the upper docking block 564 and the lower docking block 563 are completely separated. When the protrusion 542 on one floating plate 543 is in the horizontal segment 5411, the protrusions 542 on the remaining floating plates 543 are all located in the undulating segment 5412. The upper docking block 564 is rotatably connected to the floating plate 543 via a bearing. A toothed ring 544 is fixedly sleeved on the top of the outer support 53. The toothed ring 544 meshes with the upper gear 545. The upper gear 545 is fixedly sleeved on the output end of the switching motor 546. The switching motor 546 is fixed on the upper support 51.

[0023] During the rotation of the lifting screw 32 driven by the lifting motor 33, the lifting frame 553 can be moved up and down through the cooperation of the ball nut, which can adjust the height position of the docking drive mechanism 56 and the engraving cutter head 6. Before processing, the tool is selected by the switching mechanism 54. During the tool selection process, the switching motor 546 drives the gear ring 544 and the outer support 53 to rotate through the meshing of the upper gear 545. During the rotation of the outer support 53, multiple floating plates 543 move up and down along the support rod on the lower support 52 under the action of the protrusion block 542 and the side groove 541. The upper docking block 564 with the specified engraving cutter head 6 and the floating plates 543 are docked and nested with the lower docking block 563 under the limit of the protrusion block 542. The protrusions 542 on the remaining floating plates 543 are all located in the high-position undulating section 5412. The lower docking block 563 and the upper docking block 564 are completely separated in the longitudinal position. At this time, the drive motor 554 rotates through the first roller, and the drive shaft 551 can be driven to rotate by the belt 555 and the second roller. The central gear 50 at the bottom of the drive shaft 551 drives the drive gear 561 to rotate synchronously. The engraving and milling cutter head 6 on the upper docking block 564, which is completely nested with the lower docking block 563 in the longitudinal position, can rotate synchronously with the drive gear 561. At the same time, the cutter head of the engraving and milling cutter head 6 extends out of the lower support 52. With the help of the dual-axis drive mechanism 2 and the lifting mechanism 3, the workpiece can be engraved and milled.

[0024] The cleaning mechanism 57 includes a T-shaped mounting groove 571 formed on the inner wall of the drive sleeve 562. A mounting bracket 572 is fixed in the mounting groove 571. A brush head is provided on the side of the mounting bracket 572 near the milling cutter head 6. The upper docking block 564 and the lower docking block 563 fixed on the protrusion block 542 and floating plate 543 of the undulating section 5412 are completely separated. When the lower docking block 563 rotates, the upper docking block 564 will not rotate synchronously. At the same time, the milling cutter head 6 fixed on the upper docking block 564 is located in the drive sleeve 562, and the cutting head part of the milling cutter head 6 is in contact with the brush head on the mounting bracket 572. During processing, as the drive gear 561 rotates, the brush head can clean the debris on the milling cutter head 6. During the processing, the switching motor 546 stops running, keeping the milling cutter head 6 in the processing state always in a low position. That is, the protrusion 542 on the floating plate 543 corresponding to the longitudinal position of the milling cutter head 6 in the processing state is always in the horizontal section 5411, while the other milling cutter heads 6 in the cleaning state are always in a high position. During the tool changing process, as the outer support 53 rotates, the protrusion 542 on the undulating section 5412 and the inclined section 5413 and the upper docking block 564 fixed on the floating plate 543 will drive the milling cutter head 6 to move up and down. In this way, the longitudinal displacement of the milling cutter head 6 and the brush head is used to clean the debris on the milling cutter head 6, further ensuring the debris removal effect.

[0025] An air extraction mechanism 58 is provided on the top of the upper support 51. The air extraction mechanism 58 includes an industrial vacuum cleaner 581 fixed on the upper support 51 (the industrial vacuum cleaner 581 is prior art and will not be described in detail here). The input end connecting pipe of the industrial vacuum cleaner 581 is connected to the lower housing 582, and the lower housing 582 is fixed at the bottom edge of the lower support 52. During the processing, the output end of the industrial vacuum cleaner 581 is connected to an external debris collection device. The industrial vacuum cleaner 581 generates negative pressure when it is working, which is conducted to the lower housing 582 through the connecting pipe, forming an air extraction channel from the lower housing 582 to the industrial vacuum cleaner 581. This provides a negative pressure environment for the suction of chips during processing. The chips and dust generated during processing can be directly sucked into the channel and collected centrally by the external debris collection device, avoiding the accumulation of chips on the workpiece surface or direct dispersion into the surrounding environment.

[0026] It should be noted that, before processing, the transverse frame 22 and clamping table 4 of the dual-axis drive mechanism 2 are both at their origin positions; the lifting frame 553 of the lifting mechanism 3 is at its initial safe height; the multi-disc processing mechanism 5 is not in contact with the workpiece; the outer support 53 is stationary; only the protrusion 542 on the floating plate 543 corresponding to the initial engraving and milling cutter head 6 is located in the horizontal section 5411 of the side groove 541; the upper docking block 564 and the lower docking block 563 at the corresponding position are completely nested; the protrusions 542 on the remaining floating plates 543 are all in the undulating section 5412; the upper docking block 564 and the lower docking block 563 are separated; the corresponding engraving and milling cutter head 6 is located inside the drive sleeve 562; and the cutter head is in contact with the brush head of the slag cleaning mechanism 57. During processing, the operator fixes the workpiece to be processed on the clamping table 4, ensuring a firm clamping and preventing displacement during processing. Based on processing requirements, the operator starts the switching motor 546. The upper gear 545 at the output of the switching motor 546 meshes with the drive gear ring 544, causing the outer support 53 to rotate around the upper support 51 and the lower support 52. As the outer support 53 rotates, the protrusions 542 of each floating plate 543 slide along the trajectory of the side groove 541. The protrusion 542 corresponding to the designated engraving cutter head 6 moves from the undulating section 5412 through the inclined section 5413 into the horizontal section 54. 11. The floating plate 543 descends to the low position along the support rod of the lower support 52, and the upper docking block 564 and the lower docking block 563 are completely nested; the protrusions 542 on all other floating plates 543 remain in the wave section 5412, the floating plate 543 at the corresponding position is in the high position, the upper docking block 564 and the lower docking block 563 are separated, after the tool selection is completed, the switching motor 546 maintains the position of the outer support 53, and keeps the protrusion 542 corresponding to the specified tool always in the horizontal section 5411, and the other protrusions 542 always in the wave section 5412; The drive motor 554 is started, and the first roller drives the second roller and drive shaft 551 to rotate through the belt 555. The central gear 50 meshes and drives all drive gears 561. Only the engraving and milling cutter head 6 is designated to rotate at high speed in a low position. The other engraving and milling cutter heads 6 are not powered and remain in the drive sleeve 562. The industrial vacuum cleaner 581 is started at the same time. A negative pressure is formed in the industrial vacuum cleaner 581 and transmitted to the lower housing 582 through the connecting pipe to build a one-way air extraction channel to prepare for the suction of debris. The first motor 21 drives the first lead screw to rotate, which in turn drives the clamping table 4 and the workpiece to move laterally through the transverse frame 22. The second motor 23 drives the second lead screw to rotate, which drives the clamping table 4 to move longitudinally along the transverse frame 22. Together, they adjust the workpiece to the processing start position. The lifting motor 33 drives the lifting lead screw 32 to rotate, which drives the lifting frame 553 to move downward as a whole through the ball nut. This, in turn, drives the multi-disc processing mechanism 5 and the rotating designated engraving and milling cutter head 6 to descend until the cutter head contacts the workpiece and reaches the preset cutting depth. The high-speed rotating engraving and milling cutter head 6 then performs engraving and milling processing on the workpiece. During the engraving and milling process, the drive motor 554 drives the drive sleeve 562 to rotate. The non-processing engraving and milling cutter head 6, which is stationary inside the drive sleeve 562, moves relative to the brush head. The brush head cleans the residual chips on the cutting edge of the engraving and milling cutter head 6. At the same time, the exhaust channel continuously generates negative pressure, which directly sucks the chips and dust generated during processing into the channel, preventing them from accumulating on the workpiece surface or escaping into the environment. The inner sealing plate 565 works in conjunction with the exhaust to prevent chips from entering the interior of the drive sleeve 562 and to protect the transmission structure.

[0027] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A CNC engraving and milling composite machine tool, comprising a machine tool base (1), characterized in that: The machine tool base (1) is provided with a dual-axis drive mechanism (2) and a lifting mechanism (3). The dual-axis drive mechanism (2) is provided with a clamping table (4). The lifting mechanism (3) is provided with a multi-disc machining mechanism (5). The multi-disc machining mechanism (5) includes an upper support (51). A lower support (52) is fixed to the bottom of the upper support (51). An outer support (53) is rotatably connected between the lower support (52) and the upper support (51). A switching mechanism (54) is provided on the outer support (53). A central gear (50) is rotatably connected to the top center of the lower support (52). The central gear (50) is provided on the transmission mechanism (55). A pair of gears is provided on the lower support (52). The docking drive mechanism (56) includes multiple drive gears (561) rotatably connected to the lower support (52). The drive gears (561) mesh with the center gear (50). The drive gears (561) are fixedly sleeved on the drive sleeve (562). A slag cleaning mechanism (57) is provided in the drive sleeve (562). A lower docking block (563) is fixed on the top of the drive sleeve (562). An inner sealing plate (565) is fixed on the inner wall of the drive sleeve (562). The inner sealing plate (565) is slidably connected to the milling cutter head (6). The milling cutter head (6) is fixed on the upper docking block (564). The upper docking block (564) is connected to the switching mechanism (54).

2. The CNC engraving and milling composite machine tool according to claim 1, characterized in that: The switching mechanism (54) includes a side slot (541) opened on the inner wall of the outer support (53), and a protrusion (542) is slidably connected in the side slot (541), and the protrusion (542) is fixed on the floating plate (543).

3. The CNC engraving and milling composite machine tool according to claim 2, characterized in that: The floating plate (543) is slidably connected to the lower support (52), and the upper connecting block (564) is rotatably connected to the floating plate (543).

4. The CNC engraving and milling composite machine tool according to claim 1, characterized in that: The top of the outer support (53) is fixedly fitted with a toothed ring (544), which meshes with the upper gear (545). The upper gear (545) is fixedly fitted on the output end of the switching motor (546), which is fixed on the upper support (51).

5. A CNC engraving and milling composite machine tool according to claim 4, characterized in that: The top of the upper support (51) is provided with an air extraction mechanism (58), which includes an industrial vacuum cleaner (581) fixed on the upper support (51). The input end of the industrial vacuum cleaner (581) is connected to the lower housing (582) through a connecting pipe, and the lower housing (582) is fixed at the bottom edge of the lower support (52).

6. The CNC engraving and milling composite machine tool according to claim 1, characterized in that: The transmission mechanism (55) includes a drive shaft (551) fixedly connected to the central gear (50). The drive shaft (551) is rotatably connected in the support sleeve (552). The upper support (51) is fixed to the bottom of the support sleeve (552). The support sleeve (552) is fixedly installed on the lifting frame (553). A transmission motor (554) is fixedly installed on the top of the lifting frame (553). A first roller is fixedly sleeved on the output end of the transmission motor (554). A second roller is fixedly sleeved on the drive shaft (551). A belt (555) is installed on the first roller and the second roller.

7. A CNC engraving and milling composite machine tool according to claim 1, characterized in that: The slag cleaning mechanism (57) includes an installation groove (571) opened on the inner wall of the drive sleeve (562), a mounting bracket (572) is fixed in the installation groove (571), and a brush head is provided on the side of the mounting bracket (572) near the milling cutter head (6).

8. A CNC engraving and milling composite machine tool according to claim 6, characterized in that: The lifting mechanism (3) includes a fixed frame (31) fixed on the machine tool base (1), a lifting screw (32) is rotatably connected in the fixed frame (31), the lifting screw (32) is fixedly connected to the output end of the lifting motor (33), the lifting motor (33) is fixed on the fixed frame (31), the lifting frame (553) is slidably connected to the fixed frame (31), and the lifting frame (553) is connected to the lifting screw (32).

9. A CNC engraving and milling composite machine tool according to claim 1, characterized in that: The dual-axis drive mechanism (2) includes a first lead screw rotatably connected in the machine tool base (1), a first motor (21) fixed on one side of the machine tool base (1), the output end of the first motor (21) fixedly connected to one end of the first lead screw, a transverse frame (22) provided on the first lead screw, and the transverse frame (22) slidably connected on the machine tool base (1).

10. A CNC engraving and milling composite machine tool according to claim 9, characterized in that: The transverse frame (22) is slidably connected to the clamping table (4). A second motor (23) is fixed on the transverse frame (22). A second lead screw is fixedly connected to the output end of the second motor (23). The second lead screw is rotatably connected in the transverse frame (22). The clamping table (4) is connected to the second lead screw.

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