Quick replacement device of numerical control cutter and replacement method thereof

Abstract

This invention belongs to the field of CNC machine tool technology, specifically a quick-change device and method for CNC cutting tools. The device includes a CNC machine tool body, inside which are respectively arranged a three-jaw chuck for clamping workpieces, a tailstock for assisting workpiece machining, a drive system for machining, and a tool post system for machining the workpiece. The tool post system consists of a longitudinal feed mechanism for driving the longitudinal movement of the tool post and an electric tool holder for automatic tool changing during workpiece machining. This quick-change device and method for CNC cutting tools, by setting up a quick-clamping mechanism and a limit drive mechanism, allows for the quick-clamping mechanism to be driven and limited during use. When changing tools, it enables rapid removal and placement of the tool from the tool slot, followed by rapid locking and installation, thereby solving the problem of low tool changing efficiency in existing CNC machine tools.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tool technology, and in particular to a quick-change device and method for CNC cutting tools. Background Technology

[0002] CNC machine tools, short for numerical control machine tools, are automated machine tools equipped with a program control system. This control system can logically process programs with control codes or other symbolic instructions, decode them, represent them with coded numbers, and input them into the CNC device via an information carrier. After processing, the CNC device sends out various control signals to control the machine tool's movements, automatically machining parts according to the shape and dimensions required by the drawings.

[0003] CNC machine tools include CNC horizontal lathes. The spindle of a CNC horizontal lathe is manually controlled, with an integrated electromechanical design, beautiful appearance, reasonable structure, wide range of uses, and convenient operation. This machine tool can realize automatic control and can turn various parts to perform internal and external circles, end faces, grooves, arbitrary conical surfaces, spherical surfaces, and metric, imperial threads, tapered threads, etc., making it suitable for mass production.

[0004] When machining workpieces on a CNC horizontal lathe, different cutting tools are required depending on the machining needs. The existing method of changing tools involves using hexagon socket head cap screws to rotate multiple bolts on the tool holder to separate the bolts from the tool, then removing the tool, and then rotating multiple bolts to lock them onto the tool surface. This requires rotating multiple bolts sequentially, which is inconvenient for tool changing. Therefore, a quick tool changing device and method for CNC tools are needed. Summary of the Invention

[0005] To address the problem of low tool changing efficiency in existing CNC machine tools, this invention proposes a quick tool changing device and method for CNC tools.

[0006] This invention proposes a quick-change device for CNC tools, comprising a CNC machine tool body. The CNC machine tool body consists of a machine tool base, a machine tool main body on the upper surface of the machine tool base, a control system disposed on the surface of the machine tool main body, and a machine tool protective door slidably connected to the surface of the machine tool main body. The interior of the machine tool main body is respectively provided with a three-jaw chuck for clamping workpieces, a tailstock for assisting workpiece machining, a drive system for machining, and a tool post system for machining workpieces. The tool post system consists of a longitudinal feed mechanism for driving the longitudinal movement of the tool post and an electric tool holder for automatic tool changing during workpiece machining.

[0007] The upper surface of the electric tool holder is respectively provided with a quick clamping mechanism for quick tool changing and a limit driving mechanism for driving and limiting the quick clamping mechanism.

[0008] The four quick clamping mechanisms and the four limiting drive mechanisms are symmetrically distributed on the upper surface of the electric tool holder, and correspond to the four tool slots provided on the electric tool holder.

[0009] In the quick clamping mechanism, when the locking pawl and locking ratchet are engaged in the limit drive mechanism, the tool is clamped and limited, which facilitates quick tool installation.

[0010] In the quick clamping mechanism, when the locking pawl and locking ratchet are separated in the limit drive mechanism, the clamping limit lock on the tool is released, making it easy to quickly remove the tool.

[0011] Preferably, the quick clamping mechanism includes two tool clamping blocks, which are symmetrically distributed about the axis of the tool groove. The lower surfaces of the two tool clamping blocks are provided with knurling to increase the clamping friction on the tool.

[0012] The upper surface of the tool clamping block is fixedly connected with a guide limiting post, and the inner top wall of the tool groove is fixedly provided with two guide grooves corresponding to the guide limiting post. The inner walls of the two ends of the guide groove are arc-shaped.

[0013] Preferably, one end of the guide limiting post extends to the upper surface of the electric tool holder through the guide groove, and the surface of the guide limiting post is adapted to slide and fit the inner wall of the guide groove.

[0014] The inner wall of the guide groove is rotatably connected to a limiting ball via a rotating groove. The multiple limiting balls are symmetrically distributed around the axis of the guide groove. Two symmetrically distributed ball grooves are fixedly formed on the surface of the guide limiting post. The inner wall of the ball groove is slidably connected to the surface of the limiting ball.

[0015] Preferably, both of the tool clamping blocks have stepped grooves on their surfaces, and force-applying blocks are slidably connected to the inner walls of the stepped grooves. The surfaces of the force-applying blocks are U-shaped, and magnets with T-shaped surfaces are fixedly connected to both ends of the force-applying blocks by bolts.

[0016] The inner wall of the stepped groove is fixedly provided with a plug-in groove, and the inner walls of the two plug-in grooves are respectively adapted to slide and plug into the surfaces of the two magnets.

[0017] Preferably, a guide rod is fixedly connected to the upper surface of the force-applying block, and the two guide rods are symmetrically and alternately distributed with the axis of the force-applying block as the center. One end of the guide rod passes through and extends to the upper surface of the electric tool holder.

[0018] Preferably, a drive column is fixedly connected to the upper surface of the force-applying block, one end of the drive column penetrates and extends to the upper surface of the electric tool holder, and a drive helical tooth groove is fixedly opened on the surface of the drive column, and a plurality of drive helical tooth grooves are evenly distributed on the surface of the drive column.

[0019] The limiting drive mechanism includes a drive frame, which is fixedly installed on the upper surface of the electric tool holder. A bearing seat is fixedly installed on the upper surface of the drive frame, and a drive shaft is rotatably connected to the inner wall of the bearing seat through a bearing.

[0020] The two ends of the drive shaft are respectively fixedly connected to a locking ratchet and a driving ratchet, and the surface of the driving ratchet is inserted into the inner wall of the driving helical tooth groove.

[0021] Preferably, a force-applying handle is rotatably connected to the surface of the drive shaft, the inner wall of the force-applying handle is slidably connected to the surface of the locking ratchet, and a drive tooth is rotatably connected to the inner wall of the force-applying handle, one end of the drive tooth being inserted into the surface of the locking ratchet.

[0022] Preferably, the upper and lower surfaces of the other end of the drive tooth tongue are respectively provided with a limiting arc groove and an auxiliary groove, and a support spring is fixedly connected to the inner wall of the auxiliary groove. One end of the support spring is inserted into the inner bottom wall of the force application handle.

[0023] The upper surface of the force-applying handle is threaded with a handle limiting bolt, one end of which penetrates and extends to the inner wall of the force-applying handle and is inserted into the inner wall of the limiting arc groove.

[0024] Preferably, a locking shaft is rotatably connected to the inner wall of the drive frame, a torsion spring is sleeved on the surface of the locking shaft, a locking pawl is fixedly connected to the surface of the locking shaft, the two ends of the torsion spring are fixedly connected to the inner wall of the drive frame and the surface of the locking pawl respectively, and one end of the locking pawl is inserted into the surface of the locking ratchet.

[0025] Preferably, a method for changing a quick-change device for CNC cutting tools includes the following steps:

[0026] Step 1: When changing the cutting tool on the electric tool holder, move the locking pawl to separate it from the locking ratchet, release the lock on the locking ratchet, and then pull up the drive column.

[0027] Step 2: The lifting drive column drives the force block to move upward. The force block, through the magnet, causes the two tool clamping blocks to separate from the tool, and the tool is then removed.

[0028] Step 3: After removing the tool from the tool slot, place the new tool into the tool slot and release the pull on the drive column. Under the weight of the tool clamping block and the force applying block, the tool clamping block and the force applying block move downwards. The lower surface of the tool clamping block engages with the surface of the tool. Then, after the drive tooth on the force applying handle engages with the surface of the locking ratchet, rotate the force applying handle. The force applying handle drives the locking ratchet to rotate, which in turn drives the drive shaft and the drive ratchet to rotate. The drive ratchet drives the drive column downwards through the drive helical tooth groove, which in turn drives the force applying block downwards, causing the two tool clamping blocks to engage and clamp with the surface of the tool, locking the tool. When the locking ratchet rotates, the force of the torsion spring keeps the locking pawl in contact with the surface of the locking ratchet, locking the locking ratchet.

[0029] The beneficial effects of this invention are as follows:

[0030] 1. By setting up a quick clamping mechanism and a limit drive mechanism, the quick clamping mechanism is driven and limited by the limit drive mechanism during use. When changing tools, the tool can be quickly taken out from the tool slot and put in, and then quickly locked and installed. This solves the problem of low tool changing efficiency in existing CNC machine tools.

[0031] 2. By setting a limit drive mechanism, during use, the locking pawl in the limit drive mechanism locks the locking ratchet, thereby locking the drive shaft and drive ratchet, as well as the force application block and tool clamping block. This solves the problem that the existing replacement method of clamping the tool with bolts has a small contact area, and the bolts are connected to the tool holder by threads to lock the tool, which often results in the bolts loosening and causing the tool to shift, thus affecting the machining accuracy. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a quick-change device and method for CNC cutting tools proposed in this invention.

[0033] Figure 2 This is a schematic diagram of the longitudinal feed mechanism structure of a quick-change device and method for CNC tools proposed in this invention.

[0034] Figure 3 This is a perspective view of the electric tool holder structure of a quick-change device and method for CNC tools proposed in this invention.

[0035] Figure 4 This is a perspective view of the tool clamping block structure of a quick-change device and method for CNC tools proposed in this invention.

[0036] Figure 5This is a perspective view of the guide limit post structure of a quick-change device and method for CNC cutting tools proposed in this invention.

[0037] Figure 6 This is a perspective view of the force-applying block structure of a quick-change device and method for CNC cutting tools proposed in this invention.

[0038] Figure 7 This is a perspective view of the drive frame structure of a quick-change device and method for CNC cutting tools proposed in this invention.

[0039] Figure 8 This invention provides a quick-change device and method for CNC cutting tools. Figure 7 Enlarged view of the structure at point A in the middle;

[0040] Figure 9 This is a side view of the drive frame structure of a quick-change device and method for CNC tools proposed in this invention.

[0041] In the diagram: 1. Machine tool base; 2. Machine tool body; 3. Control system; 4. Machine tool safety door; 5. Three-jaw chuck; 6. Tailstock; 7. Drive system; 8. Tool post system; 801. Longitudinal feed mechanism; 802. Electric tool post; 9. Tool clamping block; 901. Guide limit post; 902. Guide groove; 903. Limiting ball; 904. Ball groove; 905. Force application block; 906. Magnet; 907. Guide rod; 908. Drive column; 909, drive helical tooth groove; 10, drive frame; 1001, bearing housing; 1002, drive shaft; 1003, locking ratchet; 1004, drive ratchet; 1005, force application handle; 1006, drive toothed tongue; 1007, limit arc groove; 1008, auxiliary groove; 1009, support spring; 1010, handle limit bolt; 1011, locking shaft; 1012, torsion spring; 1013, locking pawl. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0043] Reference Figures 1-9 A quick-change device for CNC cutting tools includes a CNC machine tool body, which is composed of a machine tool base 1, a machine tool body 2 on the upper surface of the machine tool base 1, a control system 3 disposed on the surface of the machine tool body 2, and a machine tool protective door 4 slidably connected to the surface of the machine tool body 2. The machine tool body 2 is equipped with a three-jaw chuck 5 for clamping workpieces, a tailstock 6 for assisting in the machining of workpieces, a drive system 7 for machining drive, and a tool post system 8 for machining workpieces.

[0044] The tool post system 8 consists of a longitudinal feed mechanism 801 for driving the longitudinal movement of the tool post and an electric tool post 802 for automatic tool changing during workpiece machining.

[0045] The upper surface of the electric tool holder 802 is provided with a quick clamping mechanism for quick tool changing and a limit drive mechanism for driving and limiting the quick clamping mechanism.

[0046] Four quick clamping mechanisms and four limit drive mechanisms are symmetrically distributed on the upper surface of the electric tool post 802, corresponding to the four tool slots provided on the electric tool post 802.

[0047] The quick clamping mechanism includes two tool clamping blocks 9, which are symmetrically distributed around the axis of the tool groove. The lower surfaces of the two tool clamping blocks 9 are provided with knurling to increase the clamping friction on the tool.

[0048] The upper surface of the tool clamping block 9 is fixedly connected with a guide limiting post 901, and two guide grooves 902 corresponding to the guide limiting post 901 are fixedly opened on the inner top wall of the tool groove. The inner walls of the two ends of the guide groove 902 are arc-shaped.

[0049] Furthermore, the guide limit post 901 is fixedly connected to the tool clamping block 9 by bolts, thus facilitating the replacement and maintenance of the tool clamping block 9.

[0050] One end of the guide limit post 901 extends to the upper surface of the electric tool holder 802 through the guide groove 902, and the surface of the guide limit post 901 is adapted to slide and fit the inner wall of the guide groove 902.

[0051] The inner wall of the guide groove 902 is rotatably connected to the limiting ball 903 through the rotating groove. Multiple limiting balls 903 are symmetrically distributed around the axis of the guide groove 902. Two symmetrically distributed ball grooves 904 are fixedly opened on the surface of the guide limiting post 901. The inner wall of the ball groove 904 is slidably connected to the surface of the limiting ball 903.

[0052] In use, by setting the limiting ball 903, not only can the friction between the guide limiting post 901 and the guide groove 902 be reduced when the guide limiting post 901 moves up and down, but also the guiding accuracy of the guide limiting post 901 can be further improved by the cooperation of the limiting ball 903 and the ball groove 904, thereby achieving a better guiding and limiting effect.

[0053] Both tool clamping blocks 9 have stepped grooves on their surfaces. A force-applying block 905 is slidably connected to the inner wall of the stepped groove. The surface of the force-applying block 905 is U-shaped. Both ends of the force-applying block 905 are fixedly connected to magnets 906 with T-shaped surfaces by bolts.

[0054] When in use, the surface of the force-applying block 905 is U-shaped, which makes it easy for the force-applying block 905 to withstand and generate a certain deformation when subjected to force, so that the locking pawl 1013 can lock the locking ratchet 1003 and the driving ratchet 1004.

[0055] The inner wall of the stepped groove is fixedly provided with a plug-in groove, and the inner walls of the two plug-in grooves are respectively adapted to slide and plug into the surfaces of the two magnets 906.

[0056] In use, the force-applying block 905 is magnetically connected to the two tool clamping blocks 9 by the magnet 906, so that the two tool clamping blocks 9 can move together with the force-applying block 905. The magnet 906 is T-shaped and cooperates with the insertion slot to press, position and limit the tool clamping blocks 9.

[0057] A guide rod 907 is fixedly connected to the upper surface of the force application block 905. The two guide rods 907 are symmetrically and alternately distributed with the axis of the force application block 905 as the center. One end of the guide rod 907 passes through and extends to the upper surface of the electric tool holder 802.

[0058] When in use, the guide rod 907 has the function of guiding and limiting the movement of the force-applying block 905.

[0059] A drive column 908 is fixedly connected to the upper surface of the force application block 905. One end of the drive column 908 passes through and extends to the upper surface of the electric tool holder 802. A drive helical tooth groove 909 is fixedly opened on the surface of the drive column 908. Multiple drive helical tooth grooves 909 are evenly distributed on the surface of the drive column 908.

[0060] The limit drive mechanism includes a drive frame 10, which is fixedly mounted on the upper surface of the electric tool holder 802. A bearing seat 1001 is fixedly mounted on the upper surface of the drive frame 10, and a drive shaft 1002 is rotatably connected to the inner wall of the bearing seat 1001 through a bearing.

[0061] The two ends of the drive shaft 1002 are respectively fixedly connected to a locking ratchet 1003 and a drive ratchet 1004, and the surface of the drive ratchet 1004 is inserted into the inner wall of the drive helical tooth groove 909.

[0062] In use, the drive ratchet 1004 is connected to the drive helical tooth groove 909. When the drive ratchet 1004 rotates, the drive helical tooth groove 909 drives the drive column 908 to move.

[0063] A force-applying handle 1005 is rotatably connected to the surface of the drive shaft 1002. The inner wall of the force-applying handle 1005 is slidably connected to the surface of the locking ratchet 1003. A drive tooth 1006 is rotatably connected to the inner wall of the force-applying handle 1005. One end of the drive tooth 1006 is inserted into the surface of the locking ratchet 1003.

[0064] In use, by rotating the force application handle 1005, the force application handle 1005 drives the drive tooth tongue 1006 to drive the locking ratchet 1003 to rotate, which in turn drives the drive shaft 1002 and the drive ratchet 1004 to rotate.

[0065] The upper and lower surfaces of the other end of the drive tongue 1006 are respectively provided with a limiting arc groove 1007 and an auxiliary groove 1008. A support spring 1009 is fixedly connected to the inner wall of the auxiliary groove 1008, and one end of the support spring 1009 is inserted into the inner bottom wall of the force application handle 1005.

[0066] The upper surface of the force application handle 1005 is threaded with a handle limiting bolt 1010. One end of the handle limiting bolt 1010 passes through and extends to the inner wall of the force application handle 1005 and is inserted into the inner wall of the limiting arc groove 1007.

[0067] In use, the drive tongue 1006 is supported by the inner bottom wall of the support spring 1009 and the force application handle 1005, which facilitates the quick engagement of the drive tongue 1006 with the locking ratchet 1003, thereby achieving the effect of quickly driving the locking ratchet 1003 to rotate.

[0068] A locking shaft 1011 is rotatably connected to the inner wall of the drive frame 10. A torsion spring 1012 is sleeved on the surface of the locking shaft 1011. A locking pawl 1013 is fixedly connected to the surface of the locking shaft 1011. The two ends of the torsion spring 1012 are fixedly connected to the inner wall of the drive frame 10 and the surface of the locking pawl 1013, respectively. One end of the locking pawl 1013 is inserted into the surface of the locking ratchet 1003.

[0069] In use, the torsion spring 1012 keeps the locking pawl 1013 locked to the locking ratchet 1003, thereby locking the drive shaft 1002 and the drive ratchet 1004.

[0070] A method for changing a quick-change device for CNC cutting tools includes the following steps:

[0071] Step 1: When replacing the cutting tool on the electric tool holder 802, move the locking pawl 1013 to separate it from the locking ratchet 1003, release the lock on the locking ratchet 1003, and then pull up the drive column 908.

[0072] Step 2: The lifting drive column 908 drives the force block 905 to move upward. The force block 905 drives the two tool clamping blocks 9 to separate from the tool through the magnet 906, and the tool is removed.

[0073] Step 3: After removing the tool from the tool slot, place the new tool into the tool slot and release the pull on the drive column 908. Under the weight of the tool clamping block 9 and the force applying block 905, the tool clamping block 9 and the force applying block 905 move downwards, and the lower surface of the tool clamping block 9 engages with the surface of the tool. Then, the drive tooth 1006 on the force applying handle 1005 engages with the surface of the locking ratchet 1003. Rotate the force applying handle 1005, which drives the locking ratchet 1003 to rotate, locking... The stop ratchet 1003 drives the drive shaft 1002 and the drive ratchet 1004 to rotate. The drive ratchet 1004 drives the drive column 908 to move downward through the drive helical tooth groove 909, which in turn drives the force application block 905 to move downward, so that the two tool clamping blocks 9 are inserted and pressed into the surface of the tool to lock the tool. When the locking ratchet 1003 rotates, the force of the torsion spring 1012 keeps the locking pawl 1013 in contact with the surface of the locking ratchet 1003, thus locking the locking ratchet 1003.

[0074] By setting up a quick clamping mechanism and a limit drive mechanism, the quick clamping mechanism is driven and limited during use. When changing tools, the tool can be quickly removed from the tool slot and put into place, and then quickly locked and installed. This solves the problem of low tool changing efficiency in existing CNC machine tools.

[0075] By setting a limit drive mechanism, during use, the locking pawl 1013 in the limit drive mechanism locks the locking ratchet 1003, thereby locking the drive shaft 1002 and the drive ratchet 1004, as well as the force application block 905 and the tool clamping block 9. This solves the problem that existing replacement methods use bolts to clamp the tool, which have a small contact area and the bolts are connected to the tool holder by threads, often resulting in bolt loosening and tool displacement, thus affecting machining accuracy.

[0076] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A quick-change device for CNC cutting tools, comprising a tool holder system (8) for machining workpieces, characterized in that: The tool post system (8) consists of a longitudinal feed mechanism (801) for driving the longitudinal movement of the tool post and an electric tool post (802) for automatic tool changing during workpiece machining; The upper surface of the electric tool holder (802) is respectively provided with a quick clamping mechanism for quick changing of machining tools and a limit driving mechanism for driving and limiting the quick clamping mechanism. The four quick clamping mechanisms and the four limiting drive mechanisms are symmetrically distributed on the upper surface of the electric tool holder (802), and correspond to the four tool slots provided on the electric tool holder (802); In the quick clamping mechanism, when the locking pawl (1013) and the locking ratchet (1003) are inserted in the limit drive mechanism, the tool is clamped and limited, which facilitates quick installation of the tool. The quick clamping mechanism includes a tool clamping block (9), two tool clamping blocks (9) are symmetrically distributed around the axis of the tool groove, and both tool clamping blocks (9) have stepped grooves on their surfaces. A force-applying block (905) is slidably connected to the inner wall of the stepped groove. A drive column (908) is fixedly connected to the upper surface of the force-applying block (905). One end of the drive column (908) passes through and extends to the upper surface of the electric tool holder (802). A drive helical tooth groove (909) is fixedly opened on the surface of the drive column (908). Multiple drive helical tooth grooves (909) are evenly distributed on the surface of the drive column (908). In the quick clamping mechanism, when the locking pawl (1013) and the locking ratchet (1003) in the limit drive mechanism are separated, the clamping limit lock on the tool is released, which facilitates the quick removal of the tool. The limiting drive mechanism includes a drive frame (10), which is fixedly installed on the upper surface of the electric tool holder (802). A bearing seat (1001) is fixedly installed on the upper surface of the drive frame (10), and the inner wall of the bearing seat (1001) is rotatably connected to the drive shaft (1002) through the bearing. The two ends of the drive shaft (1002) are respectively fixedly connected to a locking ratchet (1003) and a drive ratchet (1004). The surface of the drive ratchet (1004) is inserted into the inner wall of the drive helical tooth groove (909). The surface of the drive shaft (1002) is rotatably connected to a force-applying handle (1005). The inner wall of the force-applying handle (1005) is slidably connected to the surface of the locking ratchet (1003). The inner wall of the force-applying handle (1005) is rotatably connected to a drive toothed tongue (1006). One end of the drive toothed tongue (1006) is inserted into the surface of the locking ratchet (1003). The upper and lower surfaces of the other end of the drive tongue (1006) are respectively provided with a limiting arc groove (1007) and an auxiliary groove (1008). A support spring (1009) is fixedly connected to the inner wall of the auxiliary groove (1008). One end of the support spring (1009) is inserted into the inner bottom wall of the force application handle (1005). The upper surface of the force-applying handle (1005) is threaded with a handle limiting bolt (1010). One end of the handle limiting bolt (1010) passes through and extends to the inner wall of the force-applying handle (1005) and is inserted into the inner wall of the limiting arc groove (1007). The inner wall of the drive frame (10) is rotatably connected with a locking shaft (1011). A torsion spring (1012) is sleeved on the surface of the locking shaft (1011). A locking pawl (1013) is fixedly connected to the surface of the locking shaft (1011). The two ends of the torsion spring (1012) are fixedly connected to the inner wall of the drive frame (10) and the surface of the locking pawl (1013), respectively. One end of the locking pawl (1013) is inserted into the surface of the locking ratchet (1003).

2. The quick-change device for CNC cutting tools according to claim 1, characterized in that: The lower surfaces of both tool clamping blocks (9) are provided with knurling to increase the clamping friction on the tool; The upper surface of the cutting tool clamping block (9) is fixedly connected with a guide limiting post (901), and the inner top wall of the cutting tool groove is fixedly provided with two guide grooves (902) corresponding to the guide limiting post (901). The inner walls of the two ends of the guide groove (902) are arc-shaped.

3. The quick-change device for CNC cutting tools according to claim 2, characterized in that: One end of the guide limiting post (901) extends to the upper surface of the electric tool holder (802) through the guide groove (902), and the surface of the guide limiting post (901) is adapted to slide and fit the inner wall of the guide groove (902). The inner wall of the guide groove (902) is rotatably connected to the limiting ball (903) through the rotating groove. The multiple limiting balls (903) are symmetrically distributed around the axis of the guide groove (902). The surface of the guide limiting post (901) is fixedly provided with two symmetrically distributed ball grooves (904). The inner wall of the ball groove (904) is slidably connected to the surface of the limiting ball (903).

4. The quick-change device for CNC cutting tools according to claim 3, characterized in that: The surface of the force-applying block (905) is U-shaped, and both ends of the force-applying block (905) are fixedly connected with strong magnets (906) with T-shaped surfaces by bolts. The inner wall of the stepped groove is fixedly provided with a plug-in groove, and the inner walls of the two plug-in grooves are respectively adapted to slide and plug into the surfaces of the two strong magnets (906).

5. A quick-change device for CNC cutting tools according to claim 4, characterized in that: The upper surface of the force-applying block (905) is fixedly connected with a guide rod (907). The two guide rods (907) are symmetrically and alternately distributed with the axis of the force-applying block (905) as the center. One end of the guide rod (907) passes through and extends to the upper surface of the electric tool holder (802).

6. A quick-change device for CNC cutting tools according to claim 5, characterized in that: The machine tool body includes a CNC machine tool base (1), a machine tool body (2) on the upper surface of the machine tool base (1), a control system (3) set on the surface of the machine tool body (2), and a machine tool protective door (4) slidably connected to the surface of the machine tool body (2). The machine tool body (2) is equipped with a three-jaw chuck (5) for clamping workpieces, a tailstock (6) for assisting in the processing of workpieces, and a drive system (7) for processing.

7. The replacement method of the quick-change device for CNC cutting tools according to claim 6, characterized in that, Includes the following steps: Step 1: When replacing the cutting tool on the electric tool holder (802), move the locking pawl (1013) to separate the locking pawl (1013) from the locking ratchet (1003), release the lock on the locking ratchet (1003), and then pull up the drive column (908). Step 2: The force application block (905) is moved upward by the lifting drive column (908). The force application block (905) drives the two tool clamping blocks (9) to separate from the tool through the strong magnet (906), and the tool is removed. Step 3: After removing the tool from the tool slot, place the new tool into the tool slot and release the pull on the drive column (908). Under the weight of the tool clamping block (9) and the force applying block (905), the tool clamping block (9) and the force applying block (905) move downwards. The lower surface of the tool clamping block (9) engages with the surface of the tool. Then, the drive tooth (1006) on the force applying handle (1005) engages with the surface of the locking ratchet (1003). Rotate the force applying handle (1005). The force applying handle (1005) drives the locking ratchet (1003) to rotate, locking the ratchet. The ratchet (1003) drives the drive shaft (1002) and the drive ratchet (1004) to rotate. The drive ratchet (1004) drives the drive column (908) to move downward through the drive helical tooth groove (909), which in turn drives the force block (905) to move downward, so that the two tool clamping blocks (9) are inserted and pressed into the surface of the tool to lock the tool. When the locking ratchet (1003) rotates, the locking pawl (1013) is always in contact with the surface of the locking ratchet (1003) by the force of the torsion spring (1012) to lock the locking ratchet (1003).

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