Multi-head engraving and milling machine

Abstract

The utility model relates to the field of numerical control machining equipment, in particular to a multi-head engraving and milling machine. The multi-head engraving and milling machine comprises an engraving and milling machine body, a clamping disc, a clamping mechanism, a transmission mechanism, a protective door and a clamping mechanism, a clamping table is installed in the engraving and milling machine body, sliding rails are symmetrically installed at the bottom of the clamping table, and clamping blocks are installed at the top of the clamping table at equal intervals. According to the multi-head engraving and milling machine, the first gear driven by the first motor is meshed with the first rack, the first rack is meshed with the second gears at the bottoms of the multiple clamping discs, synchronous clamping and loosening of the multiple workpieces are achieved, the machining efficiency is improved through the design, it is guaranteed that each workpiece can be evenly stressed, and the machining quality is improved. And due to the design of an arc-shaped groove in the clamping mechanism and a cross-shaped groove in the top of the clamping table, the clamping blocks can smoothly move in the clamping disc and get close to each other, so that a workpiece is effectively fixed, and the workpiece is prevented from deviating or loosening in the machining process.

Description

Technical Field

[0001] This utility model relates to the field of CNC machining equipment, and in particular to a multi-head engraving and milling machine. Background Technology

[0002] Multi-head machining technology is a method of processing multiple workpieces simultaneously to improve processing efficiency. This technology is widely used in multi-head engraving and milling machines. Multi-head engraving and milling machines adopt multi-axis linkage technology, which can simultaneously perform multiple processing operations such as milling, engraving, drilling, and tapping on multiple cylindrical and cuboid workpieces. This parallel processing method significantly improves processing efficiency and shortens the production cycle.

[0003] Traditional fixing methods often require operators to manually secure each workpiece to the machine's processing area, which usually necessitates reaching inside the machine, increasing the risk of injury. Furthermore, due to the potentially large number of workpieces, manual fixing is not only inefficient but can also lead to insecure securing, affecting processing quality. Additionally, during the processing of multi-head engraving and milling machines, the high-speed rotating tools generate cutting fluid, chips, and other flying debris that can cause injury to operators. However, most traditional engraving and milling machines use manually operated safety doors, which not only increases operational complexity but also makes it difficult to quickly close the safety doors in emergencies, thus increasing safety risks.

[0004] Therefore, it is necessary to provide a new multi-head engraving and milling machine to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a multi-head engraving and milling machine.

[0006] The multi-head engraving and milling machine provided by this utility model includes: an engraving and milling machine body, a clamping plate, a clamping mechanism, a transmission mechanism, a protective door, and a locking mechanism. A clamping platform is installed inside the engraving and milling machine body. Slide rails are symmetrically installed at the bottom of the clamping platform, and clamping blocks are equidistantly installed at the top of the clamping platform. Clamping discs extending from the top of the clamping platform are equidistantly installed inside the clamping platform. Arc-shaped grooves are equidistantly opened on the top of each of the clamping discs. A clamping mechanism is installed between the clamping platform and the clamping discs. The workpiece is tightly fixed to the clamping disc by the clamping blocks through the clamping mechanism. A transmission mechanism is installed between the engraving and milling machine body and the clamping platform. The transmission mechanism drives the clamping platform to move back and forth between the processing area and the loading area via the slide rails. A protective door is symmetrically installed on one side of the engraving and milling machine body. A locking mechanism is installed between the protective door and the transmission mechanism. The protective door is opened or closed by the transmission mechanism through the locking mechanism.

[0007] Preferably, the clamping mechanism includes: a motor, a gear, a rack, and a gear. The motor is fixedly connected to the bottom of the clamping table. The output end of the motor extends into the clamping table and is fixedly connected to the gear. The rack is slidably connected inside the clamping table. The gear and the rack are meshed together. The bottom of each of the clamping discs is fixedly connected to the gear, and each of the gears meshes with the rack. The design of the clamping mechanism enables the synchronous clamping and releasing of multiple workpieces. This design not only improves processing efficiency but also ensures that each workpiece is subjected to uniform force.

[0008] Preferably, the transmission mechanism includes: a second motor, a threaded rod, and a threaded block. The second motor is fixedly connected inside the engraving and milling machine body. The output end of the second motor is fixedly connected to a threaded rod. The threaded rod is threadedly connected to a threaded block near the middle of the clamping table. The top of the threaded block is fixedly connected to the clamping table, so that the clamping table can move smoothly and accurately between the processing area and the loading area via a slide rail. This design not only improves the automation level of the equipment, but also ensures the stability and accuracy of the processing process.

[0009] Preferably, a gear three is fixedly connected to the end of the threaded rod away from the output end of the motor two, and a rack two is symmetrically meshed with the surface of the gear three.

[0010] Preferably, the locking mechanism includes: a spring, a spherical protrusion, a trapezoidal slider, and a locking groove. The ends of the two racks two away from the gear three are respectively fixedly connected to trapezoidal sliders. Each of the two trapezoidal sliders has a locking groove inside. Each of the two protective doors has a circular groove inside. Springs are fixedly connected to the inner walls of each of the two circular grooves. A spherical protrusion is fixedly connected to one end of each of the two springs. The two spherical protrusions engage with their corresponding locking grooves. The protective doors are connected to the transmission mechanism through the locking mechanism, and can automatically close during the movement of the clamping table, effectively preventing injury to operators from splashes and noise during processing.

[0011] Preferably, the inner sides of the two protective door handles are respectively rotatably connected to pull rods, the top ends of the two pull rods are respectively fixedly connected to steel ropes, and one end of the two steel ropes passes through the interior of the corresponding protective door and is fixedly connected to the corresponding spherical protrusion.

[0012] Preferably, a fixing plate is fixedly connected to the upper middle part of both of the protective door handles, and one end of each fixing plate extends into the interior of the corresponding protective door and is rotatably connected to a roller. This design reduces the friction of the steel rope during movement, making it easy for the operator to unlock the protective door.

[0013] Preferably, the middle part of the two protective doors is made of tempered glass, which allows operators to observe the processing without opening the protective doors, thus improving the transparency and operability of the equipment.

[0014] Compared with related technologies, the multi-head engraving and milling machine provided by this utility model has the following beneficial effects:

[0015] High-efficiency clamping and releasing mechanism:

[0016] By engaging gear one driven by motor one with rack one, and rack one engaging with gear two at the bottom of multiple clamping discs, simultaneous clamping and releasing of multiple workpieces is achieved. This design not only improves processing efficiency but also ensures that each workpiece is subjected to uniform force, thereby improving processing accuracy.

[0017] The arc-shaped groove in the clamping mechanism and the cross-shaped groove on the top of the clamping table allow the clamping blocks to move smoothly inside the clamping plate and close together, thereby effectively fixing the workpiece and preventing it from shifting or loosening during processing.

[0018] Flexible transmission and movement mechanism:

[0019] The threaded connection design of the threaded rod and threaded block driven by the motor allows the clamping table to move smoothly and accurately between the processing area and the loading area via the slide rail. This design not only improves the automation level of the equipment, but also ensures the stability and accuracy of the processing process.

[0020] The gear three, which is fixed at the end of the threaded rod away from the output end of motor two, meshes symmetrically with the two racks two, realizing the linkage between the transmission mechanism and the protective door, and further improving the overall coordination and efficiency of the equipment;

[0021] Safe protective door design:

[0022] The protective door is connected to the transmission mechanism via a snap-fit ​​mechanism, and can automatically close during the movement of the clamping table, effectively preventing splashes and noise during processing from injuring operators and improving workplace safety.

[0023] In special circumstances, such as when an emergency shutdown or workpiece inspection is required, the operator can manually open the safety door by pulling the lever. This design ensures both the flexibility of the equipment and the safety of the operator.

[0024] Design for easy observation and maintenance:

[0025] The protective door is made of tempered glass in the middle, allowing operators to observe the processing without opening the door, thus improving the transparency and operability of the equipment.

[0026] A fixing plate is fixed to the upper middle part of the door handle. One end of the fixing plate extends into the interior of the corresponding protective door and is connected to a roller. This design reduces the friction of the steel rope during movement, making it easy for the operator to unlock the protective door. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of the multi-head engraving and milling machine provided by this utility model;

[0028] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the engraving and milling machine body.

[0029] Figure 3 for Figure 2 The diagram shows the structure of the clamping platform.

[0030] Figure 4 for Figure 2 The diagram shows a partially enlarged cross-sectional view of the CNC engraving and milling machine body.

[0031] Figure 5 for Figure 2 The diagram shows a partially enlarged structural schematic of the tie rod.

[0032] The following components are labeled in the diagram: 1. Engraving and milling machine body; 2. Clamping table; 3. Slide rail; 4. Clamping block; 5. Clamping disc; 6. Arc groove; 7. Protective door; 8. Motor 1; 9. Gear 1; 10. Rack 1; 11. Gear 2; 12. Motor 2; 13. Threaded rod; 14. Threaded block; 15. Gear 3; 16. Rack 2; 17. Spring; 18. Spherical protrusion; 19. Trapezoidal slider; 20. Slot; 21. Pull rod; 22. Steel rope; 23. Fixing plate. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0034] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0035] Please see Figures 1 to 5A multi-head engraving and milling machine includes: a machine body 1, clamping plates 5, a clamping mechanism, a transmission mechanism, a protective door 7, and a locking mechanism. A clamping platform 2 is installed inside the machine body 1. Slide rails 3 are symmetrically installed on the bottom of the clamping platform 2. Clamping blocks 4 are equidistantly installed on the top of the clamping platform 2. Clamping plates 5 extending from the top of the clamping platform 2 are equidistantly installed inside the clamping platform 2. Arc-shaped grooves 6 are equidistantly formed on the tops of the clamping plates 5. A clamping mechanism is installed between the clamping platform 2 and the clamping plates 5. The workpiece is tightly fixed to the clamping plates 5 by the clamping blocks 4 through the clamping mechanism. A transmission mechanism is installed between the machine body 1 and the clamping platform 2, driving the clamping platform 2 through... The slide rail 3 moves back and forth between the processing area and the loading area. A protective door 7 is symmetrically installed on one side of the engraving and milling machine body 1. A locking mechanism is installed between the protective door 7 and the transmission mechanism. The protective door 7 is opened or closed by the transmission mechanism through the locking mechanism. The clamping mechanism includes: motor 8, gear 9, rack 10 and gear 11. Motor 8 is fixedly connected to the bottom of the clamping table 2. Gear 9 is fixedly connected to the output end of motor 8 inside the clamping table 2. Rack 10 is slidably connected inside the clamping table 2. Gear 9 and rack 10 are meshed. Gear 11 is fixedly connected to the bottom of each of the clamping discs 5. Each of the gears 11 is meshed with rack 10.

[0036] It should be noted that: In the initial state, the protective door 7 is open, and the clamping table 2 is located near the protective door 7 for easy loading by the operator. The clamping mechanism is not activated, and the clamping block 4 does not apply clamping force to the workpiece. The operator places the workpiece to be processed on the top of the clamping plate 5 and starts the motor 8. Its output end drives the gear 9 to rotate. The gear 9 meshes with the rack 10, driving the rack 10 to slide inside the clamping table 2. Since the rack 10 meshes with the gears 11 at the bottom of multiple clamping plates 5, the movement of the rack 10 will drive all clamping plates 5 to rotate synchronously. The top of the clamping plate 5 is provided with arc-shaped grooves 6 at equal intervals. The top of the clamping table 2 is provided with cross-shaped grooves at the corresponding positions of the clamping plates 5. The rotation of the clamping plate 5 will squeeze the clamping block 4 inside the arc-shaped groove 6 to slide in the cross groove. By moving the clamping block 4 in the arc-shaped groove 6 inside the clamping plate 5 and moving towards the center, clamping force is applied to the workpiece, and it is firmly fixed on the clamping plate 5.

[0037] The bottom of the clamping block 4 is a rectangular block that slides in connection with the inner wall of the cross groove on the top of the clamping platform 2. The middle part of the clamping block 4 is a cylindrical design that slides in connection with the inner wall of the arc groove 6 inside the clamping plate 5.

[0038] Please see Figure 3The transmission mechanism includes: motor 12, threaded rod 13 and threaded block 14. Motor 12 is fixedly connected inside the engraving and milling machine body 1. Threaded rod 13 is fixedly connected to the output end of motor 12. Threaded block 14 is threadedly connected to the threaded rod 13 near the middle of the clamping table 2. The top of threaded block 14 is fixedly connected to the clamping table 2.

[0039] It should be noted that when motor 12 starts, its output end drives the threaded rod 13 to rotate. The threaded rod 13 is threadedly connected to the threaded block 14. Therefore, the rotation of the threaded rod 13 will drive the threaded block 14 to move along the threaded rod 13. Since the top of the threaded block 14 is fixedly connected to the clamping table 2, the movement of the threaded block 14 will drive the clamping table 2 and the workpiece on it to move back and forth on the slide rail 3. As motor 12 continues to rotate, the clamping table 2 moves from the position near the protective door 7 to the processing area inside the engraving and milling machine body 1.

[0040] Please see Figures 2 to 5 A gear 15 is fixedly connected to the end of the threaded rod 13 away from the output end of the motor 12. A rack 16 is symmetrically meshed with the surface of the gear 15. The locking mechanism includes a spring 17, a spherical protrusion 18, a trapezoidal slider 19, and a slot 20. Trapezoidal sliders 19 are fixedly connected to the ends of the two racks 16 away from the gear 15. Slots 20 are provided inside the two trapezoidal sliders 19. Circular grooves are provided inside the two protective doors 7. Springs 17 are fixedly connected to the inner walls of the two circular grooves. One end of each spring 17 is fixedly connected to... Spherical protrusions 18, two of the spherical protrusions 18 are engaged with corresponding slots 20, pull rods 21 are rotatably connected to the inner sides of the handles of the two protective doors 7, steel ropes 22 are fixedly connected to the top ends of the two pull rods 21, one end of the two steel ropes 22 passes through the interior of the corresponding protective door 7 and is fixedly connected to the corresponding spherical protrusions 18, fixing plates 23 are fixedly connected to the upper middle part of the handles of the two protective doors 7, one end of the two fixing plates 23 extends into the interior of the corresponding protective door 7 and is rotatably connected to rollers, and the middle part of the two protective doors 7 is made of tempered glass;

[0041] It should be noted that during the movement of the clamping table 2, the gear 3 15 fixed at the end of the threaded rod 13 away from the output end of the motor 2 12 also rotates. The gear 3 15 meshes symmetrically with the two racks 2 16. Therefore, the rotation of the gear 3 15 will drive the two racks 2 16 to move to both sides respectively. The movement of the racks 2 16 will drive the trapezoidal slider 19 to move. The slot 20 inside the trapezoidal slider 19 engages with the spherical protrusion 18 inside the protective door 7, thereby realizing that the protective door 7 automatically closes as the clamping table 2 moves.

[0042] In special circumstances, such as when an emergency stop or inspection of a workpiece is required, the operator can pull the lever 21 to move it inside the fixed seat at the upper part of the door handle. The top of the lever 21 is fixedly connected to a steel rope 22. The steel rope 22 passes through the inside of the protective door 7, goes around the roller, and is fixedly connected to the spherical protrusion 18. Pulling the lever 21 will drive the steel rope 22 to move, thereby lifting the spherical protrusion 18 and compressing the spring 17 until the spherical protrusion 18 is completely disengaged from the slot 20. At this time, the protective door 7 can be opened manually.

[0043] After processing is completed, motor 212 rotates in the opposite direction, driving the clamping table 2 to move from the processing area back to the position close to the protective door 7. As the clamping table 2 moves, gear 315 rotates again and drives rack 216 to move. At the same time, trapezoidal slider 19 moves accordingly and engages with slot 20 through spherical protrusion 18, thereby driving the protective door 7 to open.

[0044] In special circumstances, if the protective door 7 is opened but not closed, after processing is completed, the motor 2 12 reverses and drives the gear 3 15 to move the trapezoidal slider 19 in the direction of opening the protective door 7. When the trapezoidal slider 19 contacts the spherical protrusion 18, it will squeeze the spherical protrusion 18 and compress the spring 17, so that the spherical protrusion 18 will be re-engaged in the slot 20. The protective door 7 can still be automatically closed in the next operation.

[0045] The middle part of the protective door 7 is made of tempered glass, which allows operators to observe the processing without opening the protective door 7, thus improving the transparency and operability of the equipment.

[0046] A fixing plate 23 is fixedly connected to the upper part of the door handle of the protective door 7. The fixing plate 23 has a groove inside that allows the pull rod 21 to slide, so as to ensure that when the pull rod 21 is pulled, the pull rod 21 will move in the groove without tilting or deviating.

[0047] The working principle of the multi-head engraving and milling machine provided by this utility model is as follows:

[0048] initial state

[0049] In the initial state, the protective door 7 is open, the clamping table 2 is located near the protective door 7 for easy loading by the operator, the clamping mechanism is not activated, and the clamping block 4 does not apply clamping force to the workpiece.

[0050] Feeding and clamping

[0051] The operator places the workpiece to be processed on the top of the clamping plate 5 and starts the motor 8. Its output end drives the gear 9 to rotate. The gear 9 meshes with the rack 10, driving the rack 10 to slide inside the clamping table 2. Since the rack 10 meshes with the gears 11 at the bottom of multiple clamping plates 5, the movement of the rack 10 will drive all the clamping plates 5 to rotate synchronously. The top of the clamping plate 5 is provided with arc-shaped grooves 6 at equal intervals. The top of the clamping table 2 is provided with cross-shaped grooves at the corresponding positions of the clamping plates 5. The rotation of the clamping plate 5 will squeeze the clamping block 4 inside the arc-shaped groove 6 to slide in the cross groove. By moving the clamping block 4 in the arc-shaped groove 6 inside the clamping plate 5 and moving towards the center, a clamping force is applied to the workpiece, and it is firmly fixed on the clamping plate 5.

[0052] Moving and protective door closing

[0053] Start the transmission mechanism: Motor 2 12 starts, and its output end drives the threaded rod 13 to rotate. The threaded rod 13 is threadedly connected to the threaded block 14. Therefore, the rotation of the threaded rod 13 will drive the threaded block 14 to move along the threaded rod 13. Since the top of the threaded block 14 is fixedly connected to the clamping table 2, the movement of the threaded block 14 will drive the clamping table 2 and the workpiece on it to move back and forth on the slide rail 3. As the motor 2 12 continues to rotate, the clamping table 2 moves from the position near the protective door 7 to the processing area inside the engraving and milling machine body 1.

[0054] Protective door closing: During the movement of the clamping table 2, the gear 3 15 fixed at the end of the threaded rod 13 away from the output end of the motor 2 12 also rotates. The gear 3 15 meshes symmetrically with the two racks 2 16. Therefore, the rotation of the gear 3 15 will drive the two racks 2 16 to move to both sides respectively. The movement of the racks 2 16 will drive the trapezoidal slider 19 to move. The slot 20 inside the trapezoidal slider 19 engages with the spherical protrusion 18 inside the protective door 7, thereby realizing that the protective door 7 automatically closes as the clamping table 2 moves.

[0055] In special circumstances, such as when an emergency stop or inspection of a workpiece is required, the operator can pull the lever 21 to move it inside the fixed seat at the upper part of the door handle. The top of the lever 21 is fixedly connected to a steel rope 22. The steel rope 22 passes through the inside of the protective door 7, goes around the roller, and is fixedly connected to the spherical protrusion 18. Pulling the lever 21 will drive the steel rope 22 to move, thereby lifting the spherical protrusion 18 and compressing the spring 17 until the spherical protrusion 18 is completely disengaged from the slot 20. At this time, the protective door 7 can be opened manually.

[0056] Processing completion and reset

[0057] After processing is completed, motor 212 rotates in the opposite direction, driving the clamping table 2 to move from the processing area back to the position close to the protective door 7. As the clamping table 2 moves, gear 315 rotates again and drives rack 216 to move. At the same time, trapezoidal slider 19 moves accordingly and engages with slot 20 through spherical protrusion 18, thereby driving the protective door 7 to open.

[0058] In special circumstances where the protective door 7 is opened but not closed, after processing is completed, the motor 2 12 reverses and drives the gear 3 15 to move the trapezoidal slider 19 in the direction of opening the protective door 7. When the trapezoidal slider 19 contacts the spherical protrusion 18, it will squeeze the spherical protrusion 18 and compress the spring 17, so that the spherical protrusion 18 can be re-engaged in the slot 20. The protective door 7 can still be automatically closed in the next operation.

[0059] Release clamping mechanism: Motor 8 rotates in the reverse direction, and through the meshing relationship of gear 9 and rack 10, drives clamping disk 5 to rotate in the reverse direction and release the workpiece.

[0060] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A multi-head engraving and milling machine, characterized in that, Including CNC engraving and milling machines: The engraving and milling machine body (1) has a clamping table (2) installed inside the engraving and milling machine body (1). The bottom of the clamping table (2) is symmetrically equipped with slide rails (3), and the top of the clamping table (2) is equidistantly equipped with clamping blocks (4). Clamping discs (5), clamping tables (5) extending out of the top of clamping table (2) are installed at equal intervals inside the clamping table (2), and arc-shaped grooves (6) are opened at equal intervals on the top of several clamping discs (5); A clamping mechanism is installed between the clamping table (2) and several clamping discs (5), and the workpiece is tightly fixed on the clamping discs (5) by the clamping block (4) through the clamping mechanism; A transmission mechanism is installed between the engraving and milling machine body (1) and the clamping table (2). The transmission mechanism drives the clamping table (2) to move back and forth between the processing area and the loading area via the slide rail (3). Protective door (7) is symmetrically installed on one side of the engraving and milling machine body (1). A snap-fit ​​mechanism is installed between the protective door (7) and the transmission mechanism. The protective door (7) is opened or closed by the transmission mechanism through the snap-fit ​​mechanism.

2. The multi-head engraving and milling machine according to claim 1, characterized in that, The clamping mechanism includes: motor 1 (8), gear 1 (9), rack 1 (10) and gear 2 (11). Motor 1 (8) is fixedly connected to the bottom of the clamping platform (2). The output end of motor 1 (8) extends into the clamping platform (2) and is fixedly connected to gear 1 (9). Rack 1 (10) is slidably connected inside the clamping platform (2). Gear 1 (9) and rack 1 (10) are meshed. Gear 2 (11) is fixedly connected to the bottom of each of the clamping discs (5). Each of the gear 2 (11) is meshed with rack 1 (10).

3. The multi-head engraving and milling machine according to claim 1, characterized in that, The transmission mechanism includes: motor 2 (12), threaded rod (13) and threaded block (14). Motor 2 (12) is fixedly connected inside the engraving and milling machine body (1). Threaded rod (13) is fixedly connected to the output end of motor 2 (12). Threaded block (14) is threadedly connected to the middle of the threaded rod (13) near the clamping table (2). The top of threaded block (14) is fixedly connected to the clamping table (2).

4. The multi-head engraving and milling machine according to claim 3, characterized in that, A gear three (15) is fixedly connected to one end of the threaded rod (13) away from the output end of motor two (12), and a rack two (16) is symmetrically meshed on the surface of gear three (15).

5. The multi-head engraving and milling machine according to claim 4, characterized in that, The snap-fit ​​mechanism includes: a spring (17), a spherical protrusion (18), a trapezoidal slider (19), and a slot (20). The ends of the two racks (16) away from the gear (15) are respectively fixedly connected to trapezoidal sliders (19). The interior of the two trapezoidal sliders (19) is provided with slots (20). The interior of the two protective doors (7) is provided with circular grooves. The inner walls of the two circular grooves are fixedly connected to springs (17). The ends of the two springs (17) are fixedly connected to spherical protrusions (18). The two spherical protrusions (18) snap into the corresponding slots (20).

6. The multi-head engraving and milling machine according to claim 5, characterized in that, The inner sides of the handles of the two protective doors (7) are respectively connected to pull rods (21), and the top ends of the two pull rods (21) are respectively fixedly connected to steel ropes (22). One end of the two steel ropes (22) passes through the interior of the corresponding protective door (7) and is fixedly connected to the corresponding spherical protrusion (18).

7. The multi-head engraving and milling machine according to claim 1, characterized in that, The upper middle part of the handles of the two protective doors (7) are fixedly connected to a fixing plate (23), and one end of the two fixing plates (23) extends into the interior of the corresponding protective door (7) and is rotatably connected to a roller.

8. The multi-head engraving and milling machine according to claim 1, characterized in that, The middle part of the two protective doors (7) is made of tempered glass.

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