Special tool for numerical control belt sander to machine round edge of kitchen knife

Abstract

The invention provides a special tool for a numerical control belt sander to machine a round edge of a kitchen knife, and relates to the technical field of kitchen knife machining, the special tool comprises a vertical rack and further comprises a workpiece machining positioning assembly, and the workpiece machining positioning assembly comprises machining bearing tables fixedly connected to the two ends of the outer side of the vertical rack; a base fixing seat is fixedly connected to the interior of the machining bearing table, and bottom supporting frames are fixedly connected to the four corners of the top end of the base fixing seat; the workpiece positioning assembly comprises a positioning support fixedly connected to the bottom supporting frame. The synchronous positioning driving assembly comprises a transmission rotating wheel rotationally connected to the bottom supporting frame, and a tensioning limiting wheel is fixedly connected to the top end of the base fixing seat, so that the beneficial effects that manual calibration is not needed during kitchen knife feeding, and the operation difficulty is reduced are achieved through the design; the problems of manual placement calibration and large positioning errors are solved, the kitchen knife positioning precision is remarkably improved, and the consistency of batch machining is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of kitchen knife processing technology, and in particular to a special tooling for machining the rounded edges of kitchen knives using a CNC belt sander. Background Technology

[0002] In the production and processing of kitchen knives, the rounding of the edge is a key process to ensure the safety and comfort of use. It is usually performed using a CNC belt sander for high-precision grinding. Because kitchen knives come in various sizes and the rounding of the edge requires extremely high dimensional accuracy, surface smoothness, and batch consistency, special tooling is needed to achieve precise positioning, stable clamping, and coordinated movement with the belt sander. Traditional industrial equipment is often designed with fixed specifications. This means that when it is necessary to change kitchen knives of different thicknesses or widths, operators must perform tedious disassembly and fixture replacement work, or readjust the entire equipment structure. Such operation process not only greatly reduces the efficiency of mold changing and prolongs the interruption time in the production process, but also increases the wear and maintenance costs of the equipment due to frequent disassembly and adjustment, thus significantly increasing the overall production cost. Therefore, in response to the above problems, a special tooling for machining the rounded edge of kitchen knives using a CNC belt sander is proposed. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a special tooling for machining the rounded edge of kitchen knives with a CNC belt sander.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a special tooling for machining the rounded edge of a kitchen knife on a CNC belt sander, comprising a vertical frame, and further comprising: A workpiece processing positioning assembly includes a processing support platform fixedly connected to both ends of the outer side of a vertical frame. A base fixing seat is fixedly connected inside the processing support platform, and a bottom support frame is fixedly connected to the top four corners of the base fixing seat. A workpiece positioning assembly, the workpiece positioning assembly including a positioning bracket fixedly connected to a bottom support frame; A synchronous positioning drive assembly includes a transmission wheel rotatably connected to a bottom support frame, and a tensioning limit wheel is fixedly connected to the top of the base fixing seat. A horizontal movement drive assembly, the horizontal movement drive assembly including a transverse guide rail bracket fixedly connected to a vertical frame.

[0005] Preferably, the workpiece processing positioning assembly further includes a threaded adjusting column, a drive push plate, a movable support frame, and a fixture plate, wherein the top ends of the two bottom support frames are fixedly connected to the threaded adjusting column, the drive push plate is rotatably connected to the inside of the threaded adjusting column, and the top end of the drive push plate is fixedly connected to the movable support frame and the fixture plate.

[0006] The technical effects of the above-mentioned solution are as follows: Through the coordinated operation of the vertical frame, workpiece processing positioning component, workpiece positioning component, synchronous positioning drive component, and horizontal movement drive component, precise positioning and stable clamping of the kitchen knife during processing can be achieved. The processing platform, base fixing seat, and bottom support frame in the workpiece processing positioning component form a stable processing foundation, ensuring that the kitchen knife does not wobble during grinding. The positioning bracket of the workpiece positioning component further precisely positions the kitchen knife, ensuring dimensional accuracy. The transmission wheel and tension limit wheel of the synchronous positioning drive component work together to keep the kitchen knife moving synchronously with the belt sander during processing, improving processing consistency. The transverse guide rail bracket of the horizontal movement drive component can flexibly adjust the processing position according to the processing requirements of kitchen knives of different specifications. Furthermore, the threaded adjusting column, drive push plate, moving support frame, and clamping plate in the workpiece processing positioning component can move by rotating the drive push plate through the rotation of the threaded adjusting column, thereby moving the moving support frame and clamping plate.

[0007] Preferably, the threaded adjusting column is threadedly driven to the drive push plate, and the drive push plate achieves lifting and lowering motion through the rotation of the threaded adjusting column.

[0008] The technical advantages of the above solution are as follows: Through the threaded transmission between the threaded adjusting column and the drive push plate, the lifting height of the drive push plate can be precisely controlled, thereby enabling fine-tuning of the positions of the moving support frame and the clamping plate. This design allows the specialized tooling to adapt to the processing needs of kitchen knives of different thicknesses and widths. The position of the clamping plate can be quickly adjusted simply by rotating the threaded adjusting column, eliminating the need for cumbersome disassembly and replacement of clamps.

[0009] Preferably, the workpiece positioning assembly further includes a material conveying guide rail and a workpiece positioning baffle. The material conveying guide rail is installed on the inner side of the positioning bracket, and the workpiece positioning baffle is fixedly connected to the top of the positioning bracket.

[0010] The technical effects of adopting the above technical solution are as follows: the material conveying guide rail provides a stable and smooth channel for the conveying of the kitchen knife, ensuring that the kitchen knife can maintain the correct posture and position before entering the processing area, laying the foundation for subsequent precise positioning processing. The workpiece positioning baffle plays a key positioning role. When the kitchen knife moves along the material conveying guide rail to the processing position, the workpiece positioning baffle can accurately stop the kitchen knife from moving forward, making it stop precisely at the predetermined processing position.

[0011] Preferably, the material conveying guide rail extends along the length of the positioning bracket, and the workpiece positioning baffle is arranged perpendicular to the conveying direction of the material conveying guide rail.

[0012] The technical effect of adopting the above technical solution is that the material conveying guide rail extends along the length of the positioning bracket, which can ensure that the kitchen knife maintains a straight movement during the conveying process, avoids deviation or shaking, and thus ensures the accuracy and consistency of processing. The workpiece positioning baffle is arranged perpendicular to the conveying direction of the material conveying guide rail.

[0013] Preferably, the synchronous positioning drive assembly further includes a synchronous transmission belt, which is sleeved on the outside of the transmission wheel, and the outside of the synchronous transmission belt is in contact with the outside of the tensioning limit wheel.

[0014] The technical effect of adopting the above technical solution is that the synchronous transmission belt creates a close transmission connection between the transmission wheel and the tension limit wheel. When the transmission wheel rotates, the tension limit wheel will also rotate synchronously through the synchronous transmission belt. This synchronous rotation mechanism ensures that the kitchen knife can achieve precise synchronous movement with the belt sander during the processing, which greatly improves the consistency of the rounded edge processing of the kitchen knife and avoids processing errors caused by asynchronous movement.

[0015] Preferably, the tensioning and limiting wheel tensions and limits the synchronous transmission belt, so that the synchronous transmission belt maintains the predetermined transmission path.

[0016] The technical effect of adopting the above technical solution is that the tensioning and limiting wheel, by tensioning and limiting the synchronous transmission belt, ensures that the synchronous transmission belt is always in a proper tension state and will not slip due to slack, while ensuring its stable operation along the predetermined transmission path. In this way, the transmission relationship between the transmission wheel and the tensioning and limiting wheel is more stable and reliable.

[0017] Preferably, the horizontal movement drive assembly further includes a transmission rack, a vertical support frame, a drive mounting base, a drive motor, and a transmission gear. The top of the horizontal guide rail bracket is fixedly connected to the transmission rack, the outer side of the vertical frame is fixedly connected to the vertical support frame, the top of the vertical support frame is fixedly connected to the drive mounting base, the top of the drive mounting base is mounted with the drive motor, the drive end of the drive motor is fixedly connected to the transmission gear, and the transmission rack and the transmission gear are meshed together.

[0018] The technical advantages of the above solution are as follows: After the drive motor starts, its drive end drives the transmission gear to rotate. Since the transmission rack and transmission gear are meshed, the rotation of the transmission gear drives the transmission rack to move horizontally. The transmission rack is fixedly connected to the top of the horizontal guide rail bracket, so the horizontal guide rail bracket moves horizontally accordingly. This design allows the entire fixture to flexibly adjust its processing position according to the processing requirements of different sized kitchen knives, ensuring that the kitchen knife is always in the optimal position during processing, thereby improving processing accuracy and efficiency. Simultaneously, the vertical support frame and drive mounting plate provide stable support for the drive motor, ensuring its stability during operation.

[0019] Preferably, the drive motor drives the vertical support frame to move horizontally along the transverse guide rail support through the meshing of a transmission gear and a transmission rack.

[0020] The technical advantages of the above solution are as follows: through the precise meshing of the drive motor with the transmission gears and racks, the vertical support frame achieves smooth and accurate horizontal movement on the transverse guide rail support. This transmission method not only has high transmission efficiency but also ensures smooth movement, avoiding processing errors caused by transmission instability.

[0021] Preferably, the workpiece processing positioning component, the workpiece positioning component, and the synchronous positioning drive component are all disposed on the same side of the vertical frame, wherein the synchronous positioning drive component is located below the workpiece processing positioning component, and the workpiece positioning component is located above the workpiece processing positioning component.

[0022] The technical advantages of adopting the above-mentioned technical solution are as follows: The workpiece processing positioning component, workpiece positioning component, and synchronous positioning drive component are all centrally located on the same side of the vertical frame. This layout greatly optimizes the structural compactness of the tooling, reduces the space occupied by each component, and enables the entire tooling to operate efficiently within a limited space. Simultaneously, the synchronous positioning drive component is located below the workpiece processing positioning component. This design fully utilizes the vertical space of the vertical frame, ensuring that the synchronous positioning drive component does not interfere with other components during operation and facilitating its maintenance and repair. The workpiece positioning component is located above the workpiece processing positioning component. This arrangement allows the workpiece positioning component to more directly position the kitchen knife, ensuring that the knife is in an accurate position before entering the processing area.

[0023] Compared with the prior art, the advantages and positive effects of the present invention are as follows: 1. The kitchen knife is conveyed along the trajectory defined by the positioning bracket by the material conveying guide rail. After being limited by the end of the workpiece positioning baffle, the kitchen knife is accurately dropped into the predetermined position of the mobile carrier. This design realizes that the kitchen knife loading does not require manual calibration, which reduces the difficulty of operation and solves the problems of manual placement and calibration and large positioning errors. It significantly improves the positioning accuracy of the kitchen knife and ensures the consistency of batch processing. 2. By rotating the threaded adjusting column, the drive push plate is vertically raised and lowered, which in turn drives the moving support frame and the clamping plate to adjust their height synchronously. This design achieves the advantage of being able to adapt to kitchen knives of different thicknesses without disassembling and replacing the clamps, and the clamping plate can clamp kitchen knives of different widths from the side. It solves the problems of cumbersome mold changing and poor versatility of fixed specification tooling, greatly improves mold changing efficiency, and reduces equipment wear and maintenance costs. 3. The synchronous transmission belt is driven by the rotation of the transmission wheel, and the tension limit wheel is in contact with the synchronous transmission belt to ensure that it is tensioned and does not slip. This design achieves precise coordination between the kitchen knife delivery and the sanding belt processing, avoiding the benefits of motion interference, solving the problems of easy slippage and poor coordination, reducing processing interruptions and product scrap, and improving processing efficiency. 4. The drive motor starts and drives the transmission gear to rotate. The transmission gear meshes with the transmission rack on the horizontal guide rail bracket, driving the vertical frame to move horizontally in a straight line. This design achieves the benefits of smooth horizontal movement, high displacement accuracy, and precise matching with the processing rhythm of the CNC belt sander. It solves the problem of poor consistency and ensures that the grinding depth of the rounded edges of the kitchen knife is uniform at different positions, further improving the processing dimensional accuracy and surface smoothness. Attached Figure Description

[0024] Figure 1 A perspective view of the special tooling for machining the rounded edge of a kitchen knife using a CNC belt sander provided by the present invention; Figure 2 A schematic diagram of the transverse guide rail bracket structure of the special tooling for machining the rounded edge of a kitchen knife using a CNC belt sander provided by the present invention; Figure 3 for Figure 2 Enlarged view of point B in the image; Figure 4 A schematic diagram of the fixture plate structure for a special tooling for machining the rounded edge of a kitchen knife using a CNC belt sander, provided by the present invention; Figure 5 A schematic diagram of the synchronous transmission belt structure of the special tooling for machining the rounded edge of a kitchen knife using a CNC belt sander provided by the present invention; Figure 6 for Figure 4 Enlarged view of point A in the image.

[0025] Legend; 1. Vertical frame; 2. Workpiece machining positioning assembly; 21. Machining support table; 22. Base fixing seat; 23. Bottom support frame; 24. Threaded adjustment column; 25. Drive push plate; 26. Movable support frame; 27. Fixture clamping plate; 3. Workpiece positioning assembly; 31. Positioning bracket; 32. Material conveying guide rail; 33. Workpiece positioning baffle; 4. Synchronous positioning drive assembly; 41. Transmission wheel; 42. Tensioning and limiting wheel; 43. Synchronous transmission belt; 5. Horizontal movement drive assembly; 51. Transverse guide rail bracket; 52. Transmission rack; 53. Vertical support frame; 54. Drive mounting base plate; 55. Transmission gear; 56. Drive motor. Detailed Implementation

[0026] 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.

[0027] like Figure 1 , Figure 4 and Figure 5 As shown, this embodiment provides a technical solution: a special tooling for machining the rounded edge of a kitchen knife using a CNC belt sander, including a vertical frame 1 and a workpiece machining positioning assembly 2. The workpiece machining positioning assembly 2 includes a machining support platform 21 fixedly connected to both ends of the outer side of the vertical frame 1. A base fixing seat 22 is fixedly connected inside the machining support platform 21. Bottom support frames 23 are fixedly connected to the four corners of the top of the base fixing seat 22. Threaded adjusting columns 24 are fixedly connected to the top of the two bottom support frames 23. A drive push plate 25 is rotatably connected inside the threaded adjusting column 24. A movable support frame 26 is fixedly connected to the top of the drive push plate 25. A clamping plate 27 is fixedly connected to the top of the drive push plate 25. The vertical frame 1 serves as the core load-bearing foundation of the entire special tooling, providing a stable installation benchmark and support for all functional modules such as the workpiece processing positioning component 2 and the horizontal movement drive component 5. This ensures the accuracy of the assembly positions of each component and also withstands the loads, vibrations, and lateral forces during the processing of kitchen knives using the abrasive belt. The processing platform 21 directly supports the base fixing seat 22 and subsequent positioning components, providing a stable working platform for kitchen knife processing. It also serves as a connecting transition between the vertical frame 1 and the internal positioning structure, expanding the load-bearing area and preventing structural damage caused by local stress concentration. It provides a flat processing benchmark surface, ensuring the horizontality of the kitchen knife after placement and indirectly improving the consistency of rounded edge processing. The base fixing seat 22 serves as the internal core fixing benchmark for the workpiece processing positioning component 2, used to position and install the bottom support frame 23, and provides an installation fulcrum for the tensioning limit wheel 42 of the synchronous positioning drive component 4. It integrates the assembly positions of the various internal sub-components. The bottom support frame 23 vertically supports the threaded adjustment column 24, the positioning bracket 31, and the transmission wheel 41, raising the positioning component. The distance from the bearing surface provides space for the arrangement of the synchronous transmission belt 43, while also enhancing the structural rigidity of the processing bearing table 21. The threaded adjustment column 24 achieves vertical displacement adjustment of the drive push plate 25 through threaded rotation, thereby adjusting the height of the movable bearing frame 26 and the clamping plate 27 to adapt to the processing needs of kitchen knives of different thicknesses and specifications. It can also finely adjust the contact gap between the kitchen knife and the sanding belt. The drive push plate 25 serves as the connecting carrier between the threaded adjustment column 24, the movable bearing frame 26, and the clamping plate 27, transferring the rotational movement of the threaded adjustment column 24 to the bearing surface. The linear lifting motion of the mobile carrier 26 is transformed into its own linear lifting motion, which synchronously drives the displacement of the upper positioning component. At the same time, it ensures the consistency of movement between the mobile carrier 26 and the clamping plate 27. The mobile carrier 26 directly supports the kitchen knife workpiece, providing a support surface that conforms to the shape of the kitchen knife. Together with the clamping plate 27, it achieves stable placement of the kitchen knife. At the same time, it follows the drive push plate 25 to complete the height adjustment. The clamping plate 27 clamps and positions the kitchen knife placed on the mobile carrier 26 laterally, limiting the horizontal displacement of the kitchen knife, especially resisting the lateral cutting force during belt sanding. like Figure 5 As shown, the workpiece positioning assembly 3 includes a positioning bracket 31 fixedly connected to the bottom support frame 23, a material conveying guide rail 32 installed on the inner side of the positioning bracket 31, and a workpiece positioning baffle 33 fixedly connected to the top of the positioning bracket 31. The positioning bracket 31 provides installation support for the material conveying guide rail 32 and the workpiece positioning baffle 33, and connects to the bottom support frame 23 to form an auxiliary positioning system. The height and angle of the positioning bracket 31 are adapted to the conveying and pre-positioning requirements of the kitchen knife. The material conveying guide rail 32 realizes the conveying guidance of the kitchen knife before processing, guides the kitchen knife to accurately enter the pre-positioning position of the mobile carrier 26, avoids position deviation when manually placed, and reduces friction damage between the kitchen knife and the bracket. The workpiece positioning baffle 33 limits the end of the kitchen knife on the conveying guide rail, clarifies the placement benchmark of the kitchen knife, and ensures that the end positioning of each kitchen knife is consistent when it enters the processing position, avoiding deviation in the round edge processing size due to different placement depths of the kitchen knife. like Figure 5 and Figure 6 As shown, the synchronous positioning drive assembly 4 includes a transmission wheel 41 rotatably connected to the bottom support frame 23, a tension limiting wheel 42 fixedly connected to the top of the base fixing seat 22, and a synchronous transmission belt 43 sleeved on the outer side of the transmission wheel 41, with the outer side of the synchronous transmission belt 43 in contact with the outer side of the tension limiting wheel 42. The transmission wheel 41, as the core transmission component of the synchronous transmission belt 43, drives the synchronous transmission belt 43 to move by rotating, thereby providing power transmission for the synchronous conveying or positioning of the workpiece. At the same time, it is rotatably connected to the bottom support frame 23 to ensure the smoothness of the transmission. The tension limit wheel 42 cooperates with the transmission wheel 41 to adjust and limit the tension of the synchronous transmission belt 43, avoiding transmission slippage caused by the slack of the synchronous transmission belt 43, and limiting the movement trajectory of the synchronous transmission belt 43 to ensure transmission accuracy. The synchronous transmission belt 43 transmits the power of the transmission wheel 41 to achieve the synchronization of workpiece conveying or positioning actions, especially ensuring the motion coordination between multiple stations or multiple processes, while buffering the vibration during the transmission process. The transverse guide rail bracket 51 carries the transmission rack 52 and provides a guiding reference for the horizontal movement of the vertical frame 1, limiting the direction of movement and ensuring that the vertical frame 1 drives the entire positioning structure to move smoothly in the horizontal direction, adapting to the different position requirements of belt abrasion processing. like Figure 1 - Figure 3 As shown, the horizontal movement drive assembly 5 includes a transverse guide rail bracket 51 fixedly connected to the vertical frame 1. A transmission rack 52 is fixedly connected to the top of the transverse guide rail bracket 51. A vertical support frame 53 is fixedly connected to the outer side of the vertical frame 1. A drive mounting base plate 54 is fixedly connected to the top of the vertical support frame 53. A drive motor 56 is mounted on the top of the drive mounting base plate 54. A transmission gear 55 is fixedly connected to the drive end of the drive motor 56. The transmission rack 52 and the transmission gear 55 are meshed together. The transmission rack 52 meshes with the transmission gear 55, converting the rotational motion of the drive motor 56 into the horizontal linear motion of the vertical frame 1. The accuracy of the movement distance is ensured by the precision of the rack's tooth pitch. The vertical support frame 53 supports the drive mounting base 54, raising the mounting position of the drive motor 56 to avoid interference with other moving parts. It also provides a stable mounting reference for the drive motor 56, ensuring the meshing precision of the transmission gear 55 and the transmission rack 52. The drive mounting base 54 serves as the direct mounting carrier for the drive motor 56, providing a flat and secure mounting surface. The position calibration of the drive motor 56 is achieved by fixing it with bolts, ensuring the coaxiality of the output shaft of the drive motor 56 and the transmission gear 55. The transmission gear 55 is connected to the output end of the drive motor 56 and meshes with the transmission rack 52, converting the rotational power of the drive motor 56 into horizontal linear driving force. The moving speed and displacement accuracy are controlled by the design of the number of teeth and module of the gear. The drive motor 56 serves as the power source of the horizontal moving drive component 5, providing stable power for the horizontal movement of the vertical frame 1. The motor speed and direction are controlled by the CNC system to achieve the regulation of the moving distance and direction.

[0028] Working principle; like Figure 1 - Figure 6 As shown; In actual use, the operator first places the kitchen knife to be processed on the material conveying guide rail 32. It is conveyed along the guide trajectory defined by the positioning bracket 31, and then, after being limited by the end of the workpiece positioning baffle 33, the kitchen knife accurately falls into the predetermined position of the movable support frame 26. Then, by rotating the threaded adjusting column 24, the drive push plate 25 is driven to rise and fall vertically, thereby synchronously adjusting the height of the movable support frame 26 and the clamping plate 27 until it matches the thickness of the kitchen knife and the contact gap with the sanding belt. Simultaneously, the clamping plate 27 achieves lateral clamping and positioning of the kitchen knife. In the synchronous positioning drive assembly 4, the transmission wheel 41 rotates, driving the synchronous transmission belt 43 to move, and the tensioning limit wheel 42 cooperates... By ensuring that the synchronous transmission belt 43 is taut and does not slip, the power transmission of the synchronous transmission belt 43 can drive the kitchen knife conveying and processing actions in coordination, avoiding processing interference. In the horizontal movement drive assembly 5, after the drive motor 56 starts, it drives the transmission gear 55 to rotate. Since the transmission gear 55 meshes with the transmission rack 52 and the transmission rack 52 is fixed to the horizontal guide rail bracket 51, the rotational motion can be converted into the horizontal linear motion of the vertical frame 1. The vertical support frame 53 and the drive mounting base plate 54 ensure the installation accuracy of the drive motor 56 and the transmission gear 55, thereby driving the entire positioning structure to move smoothly in the horizontal direction, realizing the rounding processing of the kitchen knife at different positions.

[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A special tooling for machining the rounded edge of a kitchen knife on a CNC belt sander, comprising a vertical frame (1), characterized in that, Also includes: The workpiece processing positioning assembly (2) includes a processing support platform (21) fixedly connected to both ends of the outside of the vertical frame (1). The processing support platform (21) is fixedly connected to a base fixing seat (22). The base fixing seat (22) is fixedly connected to the top four corners of the base fixing seat (22). The workpiece positioning assembly (3) includes a positioning bracket (31) fixedly connected to the bottom support frame (23). Synchronous positioning drive assembly (4), the synchronous positioning drive assembly (4) includes a transmission wheel (41) rotatably connected to the bottom support frame (23), and a tensioning limit wheel (42) is fixedly connected to the top of the base fixing seat (22). The horizontal movement drive assembly (5) includes a transverse guide rail bracket (51) fixedly connected to the vertical frame (1).

2. The special tooling for machining the rounded edge of a kitchen knife on a CNC belt sander according to claim 1, characterized in that, The workpiece processing positioning assembly (2) further includes a threaded adjusting column (24), a drive push plate (25), a movable support frame (26), and a fixture plate (27). The top ends of the two bottom support frames (23) are fixedly connected to the threaded adjusting column (24), the drive push plate (25) is rotatably connected inside the threaded adjusting column (24), and the top end of the drive push plate (25) is fixedly connected to the movable support frame (26) and the fixture plate (27).

3. The special tooling for machining the rounded edge of a kitchen knife on a CNC belt sander according to claim 2, characterized in that, The threaded adjusting column (24) is threadedly driven to the drive push plate (25), and the drive push plate (25) achieves lifting and lowering motion through the rotation drive of the threaded adjusting column (24).

4. The special tooling for machining the rounded edge of a kitchen knife on a CNC belt sander according to claim 1, characterized in that, The workpiece positioning assembly (3) also includes a material conveying guide rail (32) and a workpiece positioning baffle (33). The material conveying guide rail (32) is installed on the inner side of the positioning bracket (31), and the workpiece positioning baffle (33) is fixedly connected to the top of the positioning bracket (31).

5. The special tooling for machining the rounded edge of a kitchen knife on a CNC belt sander according to claim 4, characterized in that, The material conveying guide rail (32) extends along the length of the positioning bracket (31), and the workpiece positioning baffle (33) is arranged perpendicular to the conveying direction of the material conveying guide rail (32).

6. The special tooling for machining the rounded edge of a kitchen knife on a CNC belt sander according to claim 1, characterized in that, The synchronous positioning drive assembly (4) also includes a synchronous transmission belt (43), which is sleeved on the outside of the transmission wheel (41), and the outside of the synchronous transmission belt (43) is in contact with the outside of the tensioning limit wheel (42).

7. The special tooling for machining the rounded edge of a kitchen knife on a CNC belt sander according to claim 6, characterized in that, The tensioning and limiting wheel (42) tensions and limits the synchronous transmission belt (43) so that the synchronous transmission belt (43) maintains the predetermined transmission path.

8. The special tooling for machining the rounded edge of a kitchen knife on a CNC belt sander according to claim 1, characterized in that, The horizontal movement drive assembly (5) further includes a transmission rack (52), a vertical support frame (53), a drive mounting base (54), a drive motor (56), and a transmission gear (55). The top of the horizontal guide rail bracket (51) is fixedly connected to the transmission rack (52). The outside of the vertical frame (1) is fixedly connected to the vertical support frame (53). The top of the vertical support frame (53) is fixedly connected to the drive mounting base (54). The top of the drive mounting base (54) is equipped with the drive motor (56). The drive end of the drive motor (56) is fixedly connected to the transmission gear (55). The transmission rack (52) and the transmission gear (55) are meshed.

9. The special tooling for machining the rounded edge of a kitchen knife on a CNC belt sander according to claim 8, characterized in that, The drive motor (56) drives the vertical support frame (53) to move horizontally along the transverse guide rail bracket (51) through the meshing of the transmission gear (55) and the transmission rack (52).

10. The special tooling for machining the rounded edge of a kitchen knife on a CNC belt sander according to claim 1, characterized in that, The workpiece processing positioning component (2), the workpiece positioning component (3) and the synchronous positioning drive component (4) are all located on the same side of the vertical frame (1), wherein the synchronous positioning drive component (4) is located below the workpiece processing positioning component (2) and the workpiece positioning component (3) is located above the workpiece processing positioning component (2).

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