Numerical control combined machining center

Abstract

The invention relates to the technical field of numerical control machining centers, in particular to a numerical control combined machining center which comprises a base, two guide rails are fixedly connected to the upper end of the base, a sliding plate is movably connected to the upper ends of the two guide rails, two guide plates are fixedly connected to the upper end of the sliding plate, and a tool rest is movably connected to the upper end of one guide plate. A mounting frame is movably connected to the upper end of the other guide plate, a tool mounting mechanism is movably connected into the mounting frame, a tool bar is mounted through the tool mounting mechanism, a tool mounting groove is formed in the upper end of the tool rest, and a tool pressing mechanism is arranged on the upper side of the tool mounting groove. The tool bars are mounted through the tool mounting mechanism, the tool bars of different types can be stored through the storage tool changing mechanism, when the tool bars need to be replaced, the tool bars needing to be used are driven by the storage tool changing mechanism to move to the position of the tool mounting mechanism, the tool mounting mechanism automatically clamps the tool bars, and rapid tool changing is completed.

Description

Technical Field

[0001] This invention relates to the field of CNC machining center technology, specifically a CNC composite machining center. Background Technology

[0002] For example, Chinese Patent CN112192229A discloses a composite machining CNC lathe, including a worktable, a tool post mechanism and a tapping mechanism. The tool post mechanism includes a tool post and a first tool assembly. The tool post is slidably mounted on the worktable. The first tool assembly includes a first slider, a first tool holder and a first tool. The first slider is slidably mounted on the tool post. The first tool is detachably connected to the first tool holder. The tapping mechanism includes a tapping frame and a tapping assembly. The tapping frame is slidably mounted on the worktable and the tapping assembly includes a tapping slider.

[0003] In the aforementioned patent, after clamping the workpiece, the first tool is used to machine the side of the workpiece. The tapping drive shaft drives the tapping shaft to rotate, which in turn drives the tapping tool to rotate and tap, thus completing the composite machining. However, the above solution has the following shortcomings: when the tool holder in the machining center is damaged and needs to be replaced, or when it is necessary to replace it with a different type of tool holder, it is often necessary for the operator to remove the tool holder and then install it. It is impossible to achieve automatic and fast replacement of the tool holder. Therefore, we have introduced a CNC composite machining center. Summary of the Invention

[0004] The purpose of this invention is to provide a CNC composite machining center to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A CNC machining center includes a base with two guide rails fixedly connected to its upper end. A slide plate is movably connected to the upper end of each guide rail. Two guide plates are fixedly connected to the upper end of each slide plate. A tool holder is movably connected to the upper end of one guide plate, and a mounting bracket is movably connected to the upper end of the other guide plate. A tool mounting mechanism is movably connected within the mounting bracket to mount a tool holder. The tool holder has a tool mounting slot at its upper end, and a tool clamping mechanism is provided on the upper side of the tool mounting slot. The tool clamping mechanism is connected to the tool holder and mounts the tool in the tool mounting slot. The tool holder is equipped with a tool-shielding mechanism to elevate the tool installed in the tool mounting slot. The tool mounting mechanism is equipped with a tool storage and changing mechanism on its upper side to replace the tapping tool. The tool storage and changing mechanism is connected to a connecting frame, which is fixedly connected to the upper end of the base. A chuck is movably connected to the outside of the base.

[0006] Preferably, the tool mounting mechanism includes an external threaded shaft, which is movably connected to the mounting bracket. One end of the external threaded shaft is fixedly connected to a connecting plate, and two clamping plates are movably connected to the upper end of the connecting plate. A first T-slot is provided on the outer side of the clamping plate, and a toothed ring is screwed onto the outer side of the external threaded shaft. An L-shaped connecting rod is slidably connected in the first T-slot, and the end of the L-shaped connecting rod away from the first T-slot is slidably connected in a second T-slot, which is located in one end of the toothed ring.

[0007] Preferably, a T-shaped slider is fixedly connected to the lower end of the clamping plate, the T-shaped slider slides in the T-shaped guide groove, the T-shaped guide groove is opened in the upper end of the connecting plate, and a first drive motor is fixedly connected to the outside of the mounting bracket, the output end of the first drive motor is fixedly connected to one end of the external threaded shaft.

[0008] Preferably, the tool clamping mechanism includes an L-shaped connecting box, the outer side of which is fixedly connected to the output end of a first connecting motor, the first connecting motor being fixedly installed inside the tool holder, an arc-shaped rod being fixedly connected to the outer side of the L-shaped connecting box, and an arc-shaped groove being provided on the outer side of the tool holder.

[0009] Preferably, the L-shaped connecting box has two first gears inside, and a screw is fixedly connected to the lower end of the first gear. The screw is screwed into the L-shaped connecting box, and the lower end of the screw passes through the L-shaped connecting box and extends into the external environment. The two first gears mesh with a gear column, and the gear column is movably connected to the inside of the L-shaped connecting box. A second drive motor is fixedly connected to the upper end of the L-shaped connecting box, and the output end of the second drive motor is fixedly connected to the gear column.

[0010] Preferably, the blade support mechanism includes several support plates, which are movably connected to the storage cavity, which is located inside the blade holder. Support springs are fixedly connected to both ends of the support plates, and the other end of the support springs is fixedly connected to the storage cavity. A first telescopic cylinder is fixedly connected inside the storage cavity, and a conversion motor is fixedly connected to the output end of the first telescopic cylinder. The output end of the conversion motor is fixedly connected to the rotating rod.

[0011] Preferably, the tool storage and changing mechanism includes a connecting box, which is movably connected to a connecting frame. A conveyor belt is provided inside the connecting box, and a plurality of connecting pulleys are sleeved on the inner side of the conveyor belt. The connecting pulleys are movably connected to the inner side of the connecting box. A second connecting motor is fixedly connected to the outer side of the connecting box, and the output end of the second connecting motor is fixedly connected to a connecting pulley.

[0012] Preferably, a transmission gear column is provided on the outside of the connecting box, a third connecting motor is fixedly connected to the inside of the connecting box, the output end of the third connecting motor is fixedly connected to the transmission gear column, a T-shaped guide column is fixedly connected to the upper end of the connecting box, the T-shaped guide column is movably connected to the connecting frame, a second telescopic cylinder is fixedly connected to the upper end of the connecting frame, and the output end of the second telescopic cylinder is fixedly connected to the upper end of the connecting box.

[0013] Preferably, a plurality of U-shaped plates are fixedly connected to the outer side of the conveyor belt, and two clamping blocks are provided on the inner side of the U-shaped plates. A plurality of T-shaped rods are fixedly connected to the opposite sides of the two clamping blocks. The T-shaped rods are movably connected inside the U-shaped plates. The lower end of the clamping block is arc-shaped. A connecting spring is sleeved on the outer side of the T-shaped rod. One end of the connecting spring is fixedly connected to the clamping block, and the other end is fixedly connected to the U-shaped plate.

[0014] Preferably, one end of the chuck is fixedly connected to a pulley, the pulley is connected to another pulley via a belt, the other pulley is fixedly connected to the output end of a first motor, the first motor is fixedly installed on the outside of the base, the upper side of the first motor is provided with a housing, the housing is fixedly connected to the base, a lead screw is movably connected inside the guide plate and the guide rail, the tool holder, the mounting bracket and the slide are respectively connected to the corresponding lead screw, a second motor is fixedly connected inside the guide rail and the guide plate, and the output end of the second motor is fixedly connected to the lead screw.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the tool holder is installed by the tool mounting mechanism, and the tool storage and changing mechanism can store different types of tool holders. When the tool holder needs to be changed, the tool holder to be used is moved to the position of the tool mounting mechanism by the tool storage and changing mechanism. The tool mounting mechanism automatically clamps the tool holder to complete the quick tool change. At the same time, the setting of the tool pad mechanism can increase the height of the cutting tool after installation, so that the cutting tool insert is close to the center point of the workpiece. By setting the cutting tool and different types of tool holders in the machining center, the composite machining of the workpiece can be realized. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the mounting position of the outer casing of the present invention; Figure 3 This is a three-dimensional structural diagram illustrating the connection between the pulley and the belt in this invention. Figure 4 This is a three-dimensional structural diagram of the chuck position of the present invention; Figure 5 This is a three-dimensional structural diagram illustrating the positional relationship between the L-shaped connecting box and the tool holder of the present invention; Figure 6This is a schematic diagram of the three-dimensional cross-sectional structure of the tool holder of the present invention; Figure 7 For the present invention Figure 6 Enlarged 3D structural diagram at point A in the middle; Figure 8 This is a three-dimensional structural diagram of the tool holder and the L-shaped connecting box of the present invention in a separated state; Figure 9 This is a three-dimensional structural diagram of the contact state between the gear ring and the transmission gear column of the present invention; Figure 10 This is a three-dimensional structural diagram illustrating the connection between the U-shaped plate and the conveyor belt in this invention. Figure 11 This is a three-dimensional structural diagram showing the positional relationship between the clamping plate and the connecting plate of the present invention; Figure 12 This is a three-dimensional structural diagram illustrating the connection relationship between the T-shaped guide groove and the T-shaped slider of the present invention; Figure 13 This is a three-dimensional structural diagram of the clamping block holding the tool holder in the present invention.

[0017] In the diagram: 1. Base; 2. Housing; 3. First motor; 4. Guide rail; 5. Slide plate; 6. Tool holder; 7. Guide plate; 8. Connecting frame; 9. Second telescopic cylinder; 10. T-shaped guide column; 11. Connecting box; 12. First drive motor; 13. Mounting bracket; 14. External threaded shaft; 15. Second motor; 16. Lead screw; 17. Chuck; 18. Pulley; 19. Belt; 20. Second connecting motor; 21. Arc rod; 22. Gear ring; 23. Second T-slot; 24. First T-slot; 25. L-shaped connecting rod; 26. Clamping plate; 27. Connecting plate; 28. T-shaped guide groove; 29. ​​Conveyor belt; 30. Third connecting motor; 31. Transmission gear column; 32. Connecting pulley; 33. U-shaped plate; 34. Clamping block; 35. T-shaped rod; 36. Connecting spring; 37. Tool mounting slot; 38. Screw; 39. L-shaped connecting box; 40. Second transmission motor; 41. Pad plate; 42. Support spring; 43. Storage cavity; 44. First telescopic cylinder; 45. Rotating rod; 46. Conversion motor; 47. Arc groove; 48. T-shaped slider; 49. First connecting motor; 50. Gear column; 51. First gear. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1-13The present invention provides a technical solution: Example 1: A CNC composite machining center includes a base 1, with a groove at the upper end of the base 1 for storing waste material cut off during machining. Figure 2 , 3 As shown, two guide rails 4 are fixedly connected to the upper end of the base 1. A slide plate 5 is movably connected to the upper end of the two guide rails 4. One side of the guide rail 4 has an inward recess, and a part of the slide plate 5 protrudes outward and slides into the recess. Two guide plates 7 are fixedly connected to the upper end of the slide plate 5. A tool holder 6 is movably connected to the upper end of one guide plate 7, and a mounting bracket 13 is movably connected to the upper end of the other guide plate 7. Figure 2 , 5 As shown, the guide plate 7 also has recesses on both sides. The tool holder 6 and part of the mounting bracket 13 are slidably connected in the recesses. The mounting bracket 13 is movably connected to a tool mounting mechanism. The tool holder is installed through the tool mounting mechanism. The tool holder includes milling cutters, drills and tapping cutters. The tool holder 6 has a tool mounting groove 37 at the upper end. The tool mounting groove 37 is provided with a tool clamping mechanism on the upper side. The tool clamping mechanism is connected to the tool holder 6. The cutting tool is installed in the tool mounting groove 37 through the tool clamping mechanism. The tool holder 6 is equipped with a tool-shielding mechanism, which elevates the tool installed in the tool mounting slot 37. By adjusting the tool-shielding mechanism, the height of the tool after installation can be increased, so that the tool blade is close to the center point of the workpiece. The tool mounting mechanism is equipped with a tool storage and changing mechanism on the upper side, which can replace and store the tool holder. The tool storage and changing mechanism is connected to the connecting frame 8, which is fixedly connected to the upper end of the base 1. A chuck 17 is movably connected to the outside of the base 1, which clamps the workpiece to be processed.

[0020] Example 2: Based on Embodiment 1, in order to enable quick replacement of different types of tool holders, the tool mounting mechanism includes an external threaded shaft 14, which is movably connected to the mounting bracket 13. One end of the external threaded shaft 14 is fixedly connected to a connecting plate 27, and the upper end of the connecting plate 27 is movably connected to two clamping plates 26. A first T-slot 24 is provided on the outer side of the clamping plate 26. The first T-slot 24 is inclined. A toothed ring 22 is screwed onto the outer side of the external threaded shaft 14. An L-shaped connecting rod 25 is slidably connected in the first T-slot 24. The end of the L-shaped connecting rod 25 away from the first T-slot 24 is slidably connected in the second T-slot 23. The second T-slot 23 is opened in one end of the toothed ring 22. Both ends of the L-shaped connecting rod 25, which is slidably connected in the first T-slot 24 and the second T-slot 23, are T-shaped. A T-shaped slider 48 is fixedly connected to the lower end of the clamping plate 26. The T-shaped slider 48 slides in the T-shaped guide groove 28, which is opened in the upper end of the connecting plate 27. A first drive motor 12 is fixedly connected to the outside of the mounting bracket 13. The output end of the first drive motor 12 is fixedly connected to one end of the external thread shaft 14. The clamping plate 26 is limited by the T-shaped slider 48 sliding in the T-shaped guide groove 28. Since one end of the L-shaped connecting rod 25 is movably connected in the second T-shaped groove 23 and the other end slides in the first T-shaped groove 24, and there is a slope at this position, when the toothed ring 22 drives the L-shaped connecting rod 25 to move, one end of the L-shaped connecting rod 25 will move along the inclined first T-shaped groove 24. At this time, the two clamping plates 26 will move inward to clamp the tool bar. The tool clamping mechanism includes an L-shaped connecting box 39. The outer side of the L-shaped connecting box 39 is fixedly connected to the output end of the first connecting motor 49. The first connecting motor 49 can be a servo motor of appropriate size and model. The first connecting motor 49 is fixedly installed inside the tool holder 6. An arc-shaped rod 21 is fixedly connected to the outer side of the L-shaped connecting box 39. An arc-shaped groove 47 is opened on the outer side of the tool holder 6. When the first connecting motor 49 drives the L-shaped connecting box 39 to rotate to the upper side of the tool mounting groove 37, the arc-shaped rod 21 will rotate into the arc-shaped groove 47. The arc-shaped rod 21 enters the arc-shaped groove 47 to support and limit the L-shaped connecting box 39. Two first gears 51 are provided inside the L-shaped connecting box 39. The lower end of the first gear 51 is fixedly connected to a screw 38. The screw 38 is screwed into the L-shaped connecting box 39, and the lower end of the screw 38 extends through the L-shaped connecting box 39 into the external environment. The two first gears 51 mesh with the gear column 50. The gear column 50 is movably connected to the inside of the L-shaped connecting box 39. A second drive motor 40 is fixedly connected to the upper end of the L-shaped connecting box 39. The output end of the second drive motor 40 is fixedly connected to the gear column 50. The second drive motor 40 can be a servo motor of appropriate size and model. like Figure 6As shown, the padding mechanism includes several pads 41, which are movably connected to the storage cavity 43. Both ends of the pads 41 are fixedly connected to sliders. The storage cavity 43 has several grooves for the sliders to slide into. The sliders connected to both ends of the pads 41 slide into the corresponding grooves. The storage cavity 43 is located inside the tool holder 6. Both ends of the pads 41 are fixedly connected to support springs 42. The other end of the support springs 42 is fixedly connected to the storage cavity 43. A first telescopic cylinder 44 is fixedly connected inside the storage cavity 43. A conversion motor 46 is fixedly connected to the output end of the first telescopic cylinder 44. The output end of the conversion motor 46 is fixedly connected to the rotating rod 45. When the first telescopic cylinder 44 drives the rotating rod 45 to move outward, the pads 41 are pushed outward. At this time, the support springs 42 are compressed. When the first telescopic cylinder 44 drives the rotating rod 45 to retract, the pads 41 retract back into the storage cavity 43 under the elastic force of the support springs 42. The tool storage and changing mechanism includes a connecting box 11, which is movably connected to the connecting frame 8. A conveyor belt 29 is provided inside the connecting box 11, and several connecting pulleys 32 are sleeved inside the conveyor belt 29. The connecting pulleys 32 are movably connected to the inside of the connecting box 11. A second connecting motor 20 is fixedly connected to the outside of the connecting box 11. The output end of the second connecting motor 20 is fixedly connected to one of the connecting pulleys 32. The second connecting motor 20 can be a servo motor of appropriate size and model. A transmission gear column 31 is provided on the outside of the connecting box 11, and a third connecting motor 30 is fixedly connected to the inside of the connecting box 11. The output end of the third connecting motor 30 is fixedly connected to the transmission gear column 31. The third connecting motor 30 can be a servo motor of appropriate size and model. A T-shaped guide column 10 is fixedly connected to the upper end of the connecting box 11. The T-shaped guide column 10 is movably connected to the connecting frame 8. A second telescopic cylinder 9 is fixedly connected to the upper end of the connecting frame 8. The output end of the second telescopic cylinder 9 is fixedly connected to the upper end of the connecting box 11.

[0021] Several U-shaped plates 33 are fixedly connected to the outer side of the conveyor belt 29. Two clamping blocks 34 are provided on the inner side of the U-shaped plates 33. Several T-shaped rods 35 are fixedly connected to the opposite sides of the two clamping blocks 34. The T-shaped rods 35 are movably connected inside the U-shaped plates 33. The lower end of the clamping blocks 34 is arc-shaped. At the same time, clamping grooves are provided on the opposite surfaces of the two clamping blocks 34. A connecting spring 36 is sleeved on the outer side of the T-shaped rod 35. One end of the connecting spring 36 is fixedly connected to the clamping block 34, and the other end is fixedly connected to the U-shaped plate 33.

[0022] One end of the chuck 17 is fixedly connected to the pulley 18. The pulley 18 is connected to another pulley 18 via the belt 19. The other pulley 18 is fixedly connected to the output end of the first motor 3. The first motor 3 is fixedly installed on the outside of the base 1. The upper side of the first motor 3 is provided with a housing 2. The housing 2 is fixedly connected to the base 1. The guide plate 7 and the guide rail 4 are movably connected with lead screws 16. The tool holder 6, the mounting bracket 13 and the slide plate 5 are respectively connected to the corresponding lead screws 16. The guide rail 4 and the guide plate 7 are fixedly connected with second motors 15. The output end of the second motor 15 is fixedly connected to the lead screw 16. When the third connecting motor 30 and the second transmission motor 40 are performing a clamping operation, the motor current is relatively small when they first rotate to drive the corresponding component to clamp. When the clamping component contacts the object and begins to clamp, the resistance increases, the motor load becomes heavier, and the current rises significantly. When the current rises to the preset clamping threshold, the control circuit cuts off the motor power. The controller controls the motor rotation, and the current sensor monitors the motor operating current in real time. When the current is detected to continuously exceed the set value, it indicates that clamping has been achieved, and the controller immediately stops sending rotation commands to the motor.

[0023] Working principle: When in use, the workpiece is clamped by the chuck 17, and the first motor 3 drives the pulley 18 connected to its output end to rotate. Under the drive of the belt 19, the pulley 18 connected to the chuck 17 will start to rotate, and at this time the chuck 17 drives the workpiece to rotate. The height of the tool after installation can be increased by adjusting the tool pad mechanism, so that the tool blade is closer to the center point of the workpiece. Specifically, the conversion motor 46 is controlled to rotate according to the number of pads 41 to be used, so that the rotating rod 45 rotates to the corresponding number of positions. If two pads 41 are required, the rotating rod 45 is controlled to rotate to the height of the two pads 41. The first telescopic cylinder 44 is opened so that the rotating rod 45 pushes the two pads 41 in contact with it to move. When the two pads 41 enter the tool mounting slot 37, the first telescopic cylinder 44 stops pushing the pads 41. At the same time, the support spring 42 is compressed by the pads 41, and the tool is placed in the tool mounting slot 37. The first connecting motor 49 is opened to drive the L-shaped connecting box 39 to rotate, so that the L-shaped connecting box 39 rotates to the upper side of the tool mounting slot 37. At this time, the arc rod 21 enters the arc groove 47, and the first connecting motor 49 will be in a temporary self-locking state. By turning on the second drive motor 40, the gear column 50 connected to its output end is rotated. The rotation of the gear column 50 drives the two first gears 51 to rotate. The rotation of the first gears 51 drives the screw 38 to rotate. Since the screw 38 is screwed into the L-shaped connecting box 39, when the screw 38 rotates, the screw 38 will drive the first gear 51 to move downward along the gear column 50. At this time, the downward moving screw 38 will press the tool into the tool mounting slot 37, and the tool installation is completed. By opening the second motor 15 inside the two guide rails 4, the lead screw 16 connected to it starts to rotate. The rotation of the two lead screws 16 causes the slide plate 5 to move. When the tool is close to the workpiece, the second motor 15 on the lower side of the tool holder 6 is opened to start, so that the lead screw 16 connected to it rotates. At this time, the tool holder 6 drives the tool to move closer to the workpiece for processing. When it is necessary to mill grooves, drill holes or tap the outer side of the workpiece, the tool mounting mechanism is controlled to move to the lower side of the connecting box 11. The first transmission motor 12 drives the external thread shaft 14 to rotate, so that the gap between the two clamping plates 26 rotates to the upper side. After the rotation is completed, the first transmission motor 12 is controlled to be in a self-locking state. By activating the second connecting motor 20, the connecting pulley 32 connected to it rotates, causing the conveyor belt 29 to move. When the tool type to be used, clamped between the two clamping blocks 34, moves to the upper side of the two clamping plates 26, the second connecting motor 20 stops rotating. Simultaneously, the second telescopic cylinder 9 moves the connecting box 11 downwards, at which point one end of the corresponding tool enters between the two clamping plates 26. At the same time, the transmission gear column 31 meshes with the gear ring 22. The third connecting motor 30, while rotating, drives... The transmission gear column 31 rotates, driving the gear ring 22 to move along the surface of the external thread shaft 14. Since one end of the L-shaped connecting rod 25 is movably connected to the second T-slot 23 and the other end slides into the first T-slot 24, and this position has a ramp, when the gear ring 22 drives the L-shaped connecting rod 25 to move, one end of the L-shaped connecting rod 25 will move along the inclined first T-slot 24. At this time, the two clamping plates 26 will move inward to clamp the tool holder. When the connecting box 11 rises back to its initial position... Opening the second telescopic cylinder 9 causes the connecting box 11 connected to its output end to move downwards. During the movement of the connecting box 11, the tool bar will disengage from the two clamping blocks 34. When the connecting box 11 returns to the initial position, the second telescopic cylinder 9 stops. By opening the first transmission motor 12, the tool bar can be rotated to process the workpiece. When the corresponding tool bar needs to be replaced, the connecting box 11 first causes the two clamping blocks 34 that are not clamping the tool bar to move downwards. Since the lower end of the clamping blocks 34 is arc-shaped, after the two clamping blocks 34 come into contact with the tool bar, the two clamping blocks 34 will be pushed outwards. When the tool bar enters between the two clamping blocks 34, the clamping blocks 34 will clamp the tool bar under the elastic force of the connecting spring 36. The control gear ring 22 moves inwards, causing the two clamping plates 26 to open. The connecting box 11 drives the removed tool bar to move upwards. The tool bar to be replaced rotates to the upper side of the two clamping plates 26. The connecting box 11 then drives the tool bar to move downwards again to enter between the two clamping plates 26 for clamping and installation.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A CNC composite machining center, comprising a base, characterized in that: Two guide rails are fixedly connected to the upper end of the base. A slide plate is movably connected to the upper end of the two guide rails. Two guide plates are fixedly connected to the upper end of the slide plate. A tool holder is movably connected to the upper end of one guide plate, and a mounting bracket is movably connected to the upper end of the other guide plate. A tool mounting mechanism is movably connected inside the mounting bracket. The tool holder is mounted by the tool mounting mechanism. A tool mounting slot is opened at the upper end of the tool holder. A tool clamping mechanism is provided on the upper side of the tool mounting slot. The tool clamping mechanism is connected to the tool holder and the tool is mounted in the tool mounting slot by the tool clamping mechanism. The tool holder is equipped with a tool-shielding mechanism to elevate the tool installed in the tool mounting slot. The tool mounting mechanism is equipped with a tool storage and changing mechanism on its upper side to replace the tapping tool. The tool storage and changing mechanism is connected to a connecting frame, which is fixedly connected to the upper end of the base. A chuck is movably connected to the outside of the base.

2. The CNC composite machining center according to claim 1, characterized in that: The tool mounting mechanism includes an external threaded shaft, which is movably connected to a mounting bracket. One end of the external threaded shaft is fixedly connected to a connecting plate. Two clamping plates are movably connected to the upper end of the connecting plate. A first T-slot is provided on the outer side of the clamping plate. A toothed ring is screwed onto the outer side of the external threaded shaft. An L-shaped connecting rod is slidably connected in the first T-slot. The end of the L-shaped connecting rod away from the first T-slot is slidably connected in a second T-slot, which is located in one end of the toothed ring.

3. A CNC composite machining center according to claim 2, characterized in that: A T-shaped slider is fixedly connected to the lower end of the clamping plate. The T-shaped slider slides in the T-shaped guide groove, which is opened in the upper end of the connecting plate. A first drive motor is fixedly connected to the outside of the mounting bracket. The output end of the first drive motor is fixedly connected to one end of the external threaded shaft.

4. A CNC composite machining center according to claim 1, characterized in that: The tool clamping mechanism includes an L-shaped connecting box, the outer side of which is fixedly connected to the output end of a first connecting motor. The first connecting motor is fixedly installed inside the tool holder. An arc-shaped rod is fixedly connected to the outer side of the L-shaped connecting box, and an arc-shaped groove is provided on the outer side of the tool holder.

5. A CNC composite machining center according to claim 4, characterized in that: The L-shaped connecting box has two first gears inside. The lower end of the first gear is fixedly connected to a screw. The screw is screwed into the L-shaped connecting box and the lower end of the screw extends through the L-shaped connecting box into the external environment. The two first gears mesh with a gear column. The gear column is movably connected to the inside of the L-shaped connecting box. The upper end of the L-shaped connecting box is fixedly connected to a second drive motor. The output end of the second drive motor is fixedly connected to the gear column.

6. A CNC composite machining center according to claim 1, characterized in that: The blade support mechanism includes several pads, which are movably connected to the storage cavity, which is located inside the blade holder. Support springs are fixedly connected to both ends of the pads, and the other end of the support springs is fixedly connected to the storage cavity. A first telescopic cylinder is fixedly connected inside the storage cavity, and a conversion motor is fixedly connected to the output end of the first telescopic cylinder. The output end of the conversion motor is fixedly connected to the rotating rod.

7. A CNC composite machining center according to claim 1, characterized in that: The tool storage and changing mechanism includes a connecting box, which is movably connected to a connecting frame. A conveyor belt is provided inside the connecting box, and several connecting pulleys are sleeved on the inner side of the conveyor belt. The connecting pulleys are movably connected to the inner side of the connecting box. A second connecting motor is fixedly connected to the outer side of the connecting box, and the output end of the second connecting motor is fixedly connected to a connecting pulley.

8. A CNC composite machining center according to claim 7, characterized in that: The outer side of the connecting box is provided with a transmission gear column, and the inner side of the connecting box is fixedly connected with a third connecting motor. The output end of the third connecting motor is fixedly connected to the transmission gear column. The upper end of the connecting box is fixedly connected with a T-shaped guide column, which is movably connected to the connecting frame. The upper end of the connecting frame is fixedly connected with a second telescopic cylinder, and the output end of the second telescopic cylinder is fixedly connected to the upper end of the connecting box.

9. A CNC composite machining center according to claim 7, characterized in that: Several U-shaped plates are fixedly connected to the outside of the conveyor belt. Two clamping blocks are provided on the inside of the U-shaped plates. Several T-shaped rods are fixedly connected to the opposite sides of the two clamping blocks. The T-shaped rods are movably connected inside the U-shaped plates. The lower end of the clamping block is arc-shaped. A connecting spring is sleeved on the outside of the T-shaped rod. One end of the connecting spring is fixedly connected to the clamping block, and the other end is fixedly connected to the U-shaped plate.

10. A CNC composite machining center according to claim 1, characterized in that: One end of the chuck is fixedly connected to a pulley, which is connected to another pulley via a belt. The other pulley is fixedly connected to the output end of a first motor. The first motor is fixedly installed on the outside of the base. A housing is provided on the upper side of the first motor, and the housing is fixedly connected to the base. Lead screws are movably connected inside the guide plate and the guide rail. The tool holder, mounting bracket, and slide plate are respectively connected to the corresponding lead screws. A second motor is fixedly connected inside the guide rail and the guide plate. The output end of the second motor is fixedly connected to the lead screw.

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