A fixing base for antibacterial tool coating process

Abstract

This invention relates to the field of food contact knife manufacturing technology, specifically disclosing a fixed base for antibacterial knife coating processing. The base includes a fixed mounting frame located inside the coating chamber, an annular connecting frame fixedly mounted on one side of the fixed mounting frame, and a rotating platform rotatably mounted on one side of the annular connecting frame. By setting up a rotating platform and a fixed mounting frame that can rotate synchronously, multiple knives can be batch-clamped and rotated as a whole within the coating chamber, significantly improving processing efficiency. Simultaneously, the fixed mounting frame integrates multiple flexible clamping structures equipped with servo electric cylinder drives, effectively avoiding mechanical damage to the knife cutting edge or surface coating while ensuring clamping reliability. This design not only adapts to the rapid change and precise positioning of knives of different specifications but also meets the stringent requirements of high cleanliness and pollution-free operation for food-grade antibacterial knives, providing a stable and reliable tooling foundation for continuous industrial production.

Description

Technical Field

[0001] This invention relates to the field of food contact knife manufacturing technology, specifically to a fixing base for antibacterial knife coating processing. Background Technology

[0002] With increasing demands for food safety and hygiene, antibacterial knives are widely used in home kitchens, food processing, and medical surgeries. Currently, most mainstream antibacterial knives employ a hard coating with antibacterial activity, such as silver (Ag), copper (Cu), or titanium nitride (TiN), deposited on the substrate surface. This achieves long-lasting antibacterial effects through a dual mechanism of physical barrier and ion slow release. Such coatings are typically prepared using physical vapor deposition (PVD) or plasma-enhanced chemical vapor deposition (PECVD) processes, and their performance is highly dependent on the structural design and motion control of the workpiece clamping system within the coating equipment.

[0003] However, most existing commercial PVD equipment uses single-axis rotary fixtures or static hangers, which can only process 1-2 tools at a time, resulting in low production efficiency and difficulty in meeting the needs of industrial mass production. Secondly, due to the complex geometry of the tools, the target particles are easily blocked in a single revolution or rotation mode, resulting in an excessively thin coating or even no film on the back of the cutting edge and the root, forming a shadow effect. In addition, cutting oil, fingerprints or oxides often remain on the surface of the tools after machining. If the coating is applied directly without thorough cleaning, it will seriously affect the coating adhesion. Existing equipment mostly relies on external ultrasonic cleaning or manual wiping, which not only increases the number of processes but may also cause secondary pollution. Summary of the Invention

[0004] To address the above issues and overcome the shortcomings of existing technologies, this invention provides a fixed base for antibacterial tool coating processing. By setting up a rotating platform that can rotate synchronously and a fixed assembly frame, multiple tools can be batch-clamped and rotated as a whole within the coating chamber, significantly improving processing efficiency. Simultaneously, the fixed assembly frame integrates multiple tool positioning components distributed at equal angles. Each component is equipped with a flexible clamping structure driven by a servo electric cylinder, effectively avoiding mechanical damage to the tool cutting edge or surface coating while ensuring clamping reliability. This design not only adapts to the rapid replacement and precise positioning of tools of different specifications but also takes into account the stringent requirements of food-grade antibacterial tools for high cleanliness and pollution-free operation, providing a stable and reliable tooling foundation for continuous industrial production.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fixed base for antibacterial tool coating processing, comprising a fixed mounting frame located inside the coating chamber, an annular connecting frame fixedly mounted on one side of the fixed mounting frame, and a rotating base rotatably mounted on one side of the annular connecting frame. The fixed mounting frame has a rotating shaft rotatably mounted inside, and the rotating base is threadedly connected to a fixed assembly frame. The fixed assembly frame has a through hole at its center, and one end of the rotating shaft is fixedly connected to the through hole. A tool pretreatment component is also provided in the center of the front side of the fixed assembly frame, which performs surface cleaning on the tools to be processed. Several tool positioning components for tool processing positioning are also provided on one side of the fixed assembly frame, and these tool positioning components are equidistantly distributed about the central axis of the fixed assembly frame. By using the tool positioning components to process and position the tools to be processed, the tools are allowed to revolve around the central axis of the rotating base under the drive of the rotating base, thereby achieving batch coating processing of the tools.

[0006] Furthermore, two drive wheels are rotatably provided on one side of the back of the fixed mounting bracket, and the surfaces of the two drive wheels are connected by a synchronous belt drive; the interior of one of the drive wheels is fixedly connected to one end of the rotating shaft, and the interior of the rotating shaft is provided with a central through hole through both ends, and an air supply pipe is rotatably provided inside the end of the rotating shaft located inside the drive wheel, and one end of the air supply pipe passes through the coating chamber and extends to the outside.

[0007] Furthermore, a rotary servo motor is fixedly installed outside the coating chamber, and one end of the output shaft of the rotary servo motor extends into the interior of the coating chamber. The output shaft of the rotary servo motor is fixedly connected to the interior of another transmission wheel.

[0008] Furthermore, one side of the annular connecting frame is provided with a connecting groove, and one side of the rotating base is slidably connected to the inside of the connecting groove. At the same time, a number of sliding balls are also arranged in an annular pattern on one side of the rotating base, and the surfaces of the number of sliding balls are all slidably connected to the inside of the connecting groove.

[0009] Furthermore, a stationary friction ring is fixedly provided in the middle of one side of the fixed mounting bracket; the fixed mounting bracket has a number of assembly threaded holes inside, and each of the assembly threaded holes is threadedly connected to an assembly sleeve, and each of the assembly sleeves is rotatably provided with a tool positioning frame inside; three connecting slide rods are slidably provided in one side of the tool positioning frame, and a drive wheel is fixedly provided at one end of each of the three connecting slide rods. Disc springs are also sleeved on the surface of the three connecting slide rods, and the two ends of the disc springs are respectively in contact with the drive wheel and one side of the tool positioning frame.

[0010] Furthermore, a limiting annular block is fixedly provided on one side of the surface of the tool positioning frame, and an annular sliding groove that cooperates with the limiting annular block is provided inside the mounting sleeve.

[0011] Furthermore, the tool positioning assembly includes a plurality of tool positioning blocks located inside the tool positioning frame, a plurality of tool positioning servo electric cylinders fixedly mounted on the outer peripheral surface of the tool positioning frame, and the plurality of tool positioning servo electric cylinders are distributed at equal angles about the central axis of the tool positioning frame, and one end of the drive shaft of the plurality of tool positioning servo electric cylinders is fixedly connected to one side of the plurality of tool positioning blocks respectively.

[0012] Furthermore, the tool pretreatment assembly includes a pretreatment frame, one side of which is threadedly connected to one side of the fixed assembly frame. The pretreatment frame has an airflow channel inside, and several air nozzles are evenly distributed on the outer circumference of the pretreatment frame. The interior of each air nozzle is connected to the interior of the airflow channel. Each air nozzle is equipped with an electromagnetic control valve for independently controlling the opening and closing of the air jet inside each air nozzle. Fiber optic arrays are also provided on the surface of the pretreatment frame and on both sides of each air nozzle to target and heat the cutting edge of the tool.

[0013] Furthermore, an RF coil is fixedly installed inside one side of the fixed assembly frame, and a center electrode is fixedly installed on the other side of the pretreatment frame, with the center electrode being encapsulated and fixed by a ceramic sleeve.

[0014] The beneficial effects achieved by the present invention using the above structure are as follows: This invention enables batch clamping and overall rotation of multiple cutting tools within a coating chamber by setting up a synchronously rotating base and a fixed assembly frame, significantly improving processing efficiency. Simultaneously, the fixed assembly frame integrates multiple equally angled tool positioning components, each equipped with a flexible clamping structure driven by a servo electric cylinder. This effectively avoids mechanical damage to the tool cutting edge or surface coating while ensuring clamping reliability. This design not only adapts to the rapid replacement and precise positioning of tools of different specifications but also meets the stringent requirements of food-grade antibacterial tools for high cleanliness and pollution-free operation, providing a stable and reliable tooling foundation for continuous industrial production.

[0015] In this invention, during the revolution of the cutting tool driven by the rotating base, each cutting tool positioning frame generates a reverse rotation torque through the relative sliding between the drive wheel and the stationary friction ring, thereby enabling the cutting tool to rotate simultaneously with its revolution. This composite motion effectively overcomes the problem of uneven coating caused by geometric shielding in traditional unidirectional rotational coating, allowing complex areas such as the cutting edge, sides, and root of the cutting tool to periodically face the coating source, significantly improving the integrity and thickness consistency of the film coverage. It is especially suitable for kitchen or medical antibacterial knives with complex contours.

[0016] This invention removes surface dust through controlled airflow before coating, uses infrared optical fiber to non-contactly heat key areas to promote contaminant desorption, and uses a radio frequency electrode system to excite low-temperature plasma near the tool to achieve efficient cleaning and chemical activation. This integrated pretreatment mechanism eliminates the need for additional workpiece transfer, avoids the risk of secondary contamination, and significantly improves the controllability of the surface state before coating, thus creating favorable conditions for the high adhesion deposition of subsequent antibacterial functional coatings. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a fixed base structure for antibacterial tool coating processing according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the transmission wheel, synchronous belt, and rotary servo motor structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the fixed mounting frame, rotating base, and pretreatment frame structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the rotating base and drive wheel structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the assembly sleeve and tool positioning frame structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the tool positioning frame and drive wheel structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the fixed assembly frame and pre-treatment frame structure according to an embodiment of the present invention.

[0018] In the diagram, 1. Fixed mounting bracket; 2. Annular connecting bracket; 3. Rotating base; 4. Fixed assembly bracket; 5. Tool positioning assembly; 6. Tool pretreatment assembly; 7. Rotating shaft; 8. Transmission wheel; 9. Synchronous belt; 10. Rotary servo motor; 11. Air supply pipe; 12. Static friction ring; 13. Through hole; 14. Pretreatment bracket; 15. Air outlet; 16. Fiber optic array; 17. Assembly threaded hole; 18. Assembly sleeve; 19. Annular groove; 20. Tool positioning bracket; 21. Limiting annular block; 22. Connecting slide rod; 23. Disc spring; 24. Drive wheel; 25. RF coil; 26. Center electrode; 27. Tool positioning block; 28. Tool positioning servo electric cylinder. Detailed Implementation

[0019] 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.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] Example 1 Please see Figures 1 to 7 As shown, a fixed base for antibacterial tool coating processing includes: a fixed mounting frame 1 located inside the coating chamber, an annular connecting frame 2 fixedly located on one side of the fixed mounting frame 1, and a rotating base 3 rotatably located on one side of the annular connecting frame 2; the fixed mounting frame 1 has a rotating shaft 7 rotatably mounted inside, and the rotating base 3 is threadedly connected to a fixed assembly frame 4, with a through hole 13 at the center of the fixed assembly frame 4. One end of the rotating shaft 7 is fixedly connected to the inside of the through hole 13. A tool pretreatment component 6 is also provided in the center of the front of the fixed assembly frame 4, which performs surface cleaning treatment on the tools to be processed; a plurality of tool positioning components 5 for tool processing positioning are also provided on one side of the fixed assembly frame 4, and the plurality of tool positioning components 5 are distributed at equal angles about the central axis of the fixed assembly frame 4; by using the tool positioning components 5 to process and positioning the plurality of tools to be processed, the plurality of tools to be processed are made to revolve around the central axis of the rotating base 3 under the drive of the rotating base 3, thereby realizing batch coating processing of the tools.

[0022] It should be noted that the fixed mounting bracket 1 is made of high-strength stainless steel or high-temperature resistant alloy material, which has good thermal stability and mechanical strength; it has bearing seats inside to support the precision rolling bearings at both ends of the rotating shaft 7, ensuring smooth rotation and low friction; the back is provided with drive wheel mounting holes to fit two parallel drive wheels 8, ensuring that the tension of the synchronous belt 9 is adjustable.

[0023] The rotating shaft 7 adopts a high-precision dynamic balance design and is plated with hard chrome or ceramic coating to improve wear resistance and corrosion resistance. One end of the rotating shaft 7 is connected to the transmission wheel 8 through a coupling or direct key, and the other end is inserted into the through hole 13 and fixed by a stop screw.

[0024] Specifically, such as Figure 2 As shown, two drive wheels 8 are rotatably mounted on one side of the back of the fixed mounting bracket 1, and the surfaces of the two drive wheels 8 are connected by a synchronous belt 9; the interior of one of the drive wheels 8 is fixedly connected to one end of the rotating shaft 7, and the interior of the rotating shaft 7 has a central through hole through both ends. An air supply pipe 11 is rotatably mounted inside the end of the rotating shaft 7 located inside the drive wheel 8, and one end of the air supply pipe 11 passes through the coating chamber and extends to the outside; different types of gas are introduced into the interior of the rotating shaft 7 through the air supply pipe 11 to achieve different auxiliary treatments for the coating of the tool. A rotary servo motor 10 is fixedly installed outside the coating chamber, and one end of the output shaft of the rotary servo motor 10 extends into the interior of the coating chamber. One end of the output shaft of the rotary servo motor 10 is fixedly connected to the interior of another transmission wheel 8. The surface of the output shaft of the rotary servo motor 10 and the coating chamber are sealed by a magnetic fluid seal to ensure the airtightness of the interior of the coating chamber. The output shaft of the rotary servo motor 10 controls one of the transmission wheels 8 to rotate inside the fixed mounting frame 1. The synchronous belt 9 drives the two transmission wheels 8 to perform synchronous transmission inside the fixed mounting frame 1. Then, the other transmission wheel 8 drives the rotary shaft 7 to rotate. The rotary shaft 7 drives the rotary base 3 to rotate through the fixed mounting frame 4, so that the tool to be processed rotates as a whole inside the coating chamber, thereby realizing the batch coating process of the tool.

[0025] In summary, this embodiment achieves simultaneous batch coating of multiple cutting tools by setting up a fixed mounting frame 1, an annular connecting frame 2, and a rotating base 3 within the coating chamber, and driving the rotating shaft 7 via a rotary servo motor 10 through a synchronous belt 9 and a transmission wheel 8, thereby causing the fixed mounting frame 4 to revolve as a whole. Simultaneously, the rotating shaft 7 adopts a hollow structure and has a built-in gas supply pipe 11, allowing the introduction of process gases such as Ar and N2 during the coating process for atmosphere control or reaction assistance. The rotating shaft 7 is rigidly connected to the fixed mounting frame 4 through a through hole 13 and supported within the fixed mounting frame 1 by high-precision bearings. Combined with a magnetohydrodynamic sealing structure, this ensures vacuum sealing and operational stability under high-speed rotation. This design significantly improves the automation level, process compatibility, and production efficiency of the equipment, solving problems such as the inability of traditional single-tool fixtures to process in batches, difficulties in gas supply, and easy seal failure, providing a reliable platform for the industrial-scale stable preparation of antibacterial coatings.

[0026] Example 2 Specifically, such as Figures 3 to 6As shown, it should be noted that one side of the annular connecting frame 2 is provided with a connecting groove, and one side of the rotating base 3 is slidably connected to the inside of the connecting groove. At the same time, several sliding balls are also distributed in a ring on one side of the rotating base 3, and the surfaces of the several sliding balls are all slidably connected to the inside of the connecting groove. The annular connecting frame 2 is circular, and the annular groove on one side is used to guide the rotating base 3 to slide circumferentially. The inner surface of the annular groove is polished to reduce the coefficient of friction, and together with the several sliding balls, it achieves rolling support and reduces rotational resistance. The material is selected as wear-resistant engineering plastic or surface nitrided metal, taking into account both wear resistance and insulation.

[0027] A stationary friction ring 12 is fixedly provided in the middle of one side of the fixed mounting bracket 1; the fixed assembly bracket 4 has a number of assembly threaded holes 17 inside, and each of the assembly threaded holes 17 is threadedly connected to an assembly sleeve 18, and each of the assembly sleeves 18 is rotatably provided with a tool positioning bracket 20; three connecting slide rods 22 are slidably provided on one side inside the tool positioning bracket 20, and a drive wheel 24 is fixedly provided at one end of each of the three connecting slide rods 22. Disc springs 23 are also sleeved on the surface of the three connecting slide rods 22, and the two ends of the disc springs 23 are in contact with the drive wheel 24 and one side of the tool positioning bracket 20, respectively.

[0028] It should be noted that the stationary friction ring 12 is fixed to one side of the fixed mounting bracket 1 and does not rotate with the rotating base 3; the surface is covered with a high friction coefficient coating to ensure sufficient friction; the inner diameter of the stationary friction ring 12 is slightly larger than the outer diameter of the drive wheel 24, so that the drive wheel 24 always slides against its surface during the revolution.

[0029] Furthermore, a limiting annular block 21 is fixedly provided on one side of the surface of the tool positioning holder 20, and the interior of the mounting sleeve 18 is provided with an annular groove 19 that cooperates with the limiting annular block 21. After the threaded assembly between the mounting sleeve 18 and the mounting threaded hole 17 is completed, the tool positioning holder 20 is also installed into the interior of the mounting threaded hole 17 through the sliding limitation between the limiting annular block 21 and the annular groove 19. At the same time, one side of the drive wheel 24 is subjected to the preload force of three disc springs 23, causing the drive wheel 24 to move away from the tool positioning holder 20 as a whole. At this time, the other side of the drive wheel 24 is always pressed against one side of the stationary friction ring 12. As the rotating base 3 rotates, The clockwise rotation causes the outer edges of several drive wheels 24 to slide synchronously around one side of the stationary friction ring 12. Since the stationary friction ring 12 is fixed, the outer edges of the drive wheels 24 slide across the surface of one side of the stationary friction ring 12 at a certain speed. According to the law of friction, the direction of friction is opposite to the direction of relative sliding. Therefore, when the friction force acts on the outer edge of the drive wheel 24, the direction of the friction force is counterclockwise tangential. The friction force generates a counterclockwise torque on the center of the drive wheel 24, thereby causing the drive wheel 24 to start rotating counterclockwise. The drive wheel 24, in conjunction with the three connecting slide rods 22, drives the tool positioning frame 20 to rotate counterclockwise.

[0030] It should be noted that the drive wheel 24 is disc-shaped, with an annular friction working surface of 5-8mm width on its outer edge; the stationary friction ring 12 is a coaxial annular boss fixed on the fixed mounting bracket 1, and its inner surface is sandblasted and covered with a fluororubber layer of 0.5-1.0mm thickness, with a Shore hardness of 60-70A; the friction working surface of the drive wheel 24 is covered with a polyimide composite coating, and the coefficient of friction μ is measured to be ≥0.4 under Ar atmosphere and 25℃ conditions; under the preload of the disc spring 23, the normal pressure N between the drive wheel 24 and the stationary friction ring 12 is 1.5-3.0N, ensuring that the drive wheel 24 can stably rotate without slipping when the revolution speed is 5-30rpm.

[0031] The free height of the disc spring 23 is 8mm, and the working height after compression is 5mm. The axial spring force provided by a single spring is 0.6-1.0N. The combined force of the three springs 23 provides a total clamping force of 1.8-3.0N, so that the drive wheel 24 is always pressed against the stationary friction ring 12, and effective contact can be maintained even when the rotating base 3 rotates at high speed or there is micro-vibration in the cavity.

[0032] Furthermore, the tool positioning assembly 5 includes a plurality of tool positioning blocks 27 disposed inside the tool positioning frame 20. A plurality of tool positioning servo cylinders 28 are fixedly disposed on the outer peripheral surface of the tool positioning frame 20, and the plurality of tool positioning servo cylinders 28 are distributed at equal angles about the central axis of the tool positioning frame 20. One end of the drive shaft of the plurality of tool positioning servo cylinders 28 is fixedly connected to one side of the plurality of tool positioning blocks 27 respectively.

[0033] It should be noted that each of the tool positioning blocks 27 has a soft buffer pad on one side, preferably a polytetrafluoroethylene or silicone pad, to protect the clamping area of ​​the tool and prevent damage to the cutting edge or surface coating. When the rotating base 3 revolves clockwise, the drive wheel 24 rotates counterclockwise due to friction caused by relative sliding, thereby driving the tool positioning frame 20 to rotate synchronously. The rotation speed is determined by the revolution speed, the coefficient of friction and the preload of the disc spring, realizing a composite motion of revolution and reverse rotation, which significantly improves the uniformity of the tool coating.

[0034] Specifically, let the angular velocity of the rotating base 3 be... Clockwise, with radius r of drive wheel 24 and radius R (the distance from the center of drive wheel to the center of the chamber), the linear velocity of the outer edge of drive wheel relative to stationary friction ring 12 is... Under steady state, the rotational angular velocity of the drive wheel 24 is... satisfy: Where k is the system damping coefficient, μ is the friction coefficient, and N is the normal force; actual measurements show that when the revolution speed is 8 rpm, the rotation speed of the drive wheel 24 is about 2-3 rpm, and the direction is opposite to the revolution; this revolution combined with the reverse rotation compound motion makes each surface of the tool edge periodically face the sputtering target, and the measured coating thickness uniformity is reduced from 22% of the traditional single revolution structure to below 9%.

[0035] In summary, this embodiment, based on embodiment 1, innovatively introduces a passive rotation mechanism consisting of a static friction ring 12, a drive wheel 24, a disc spring 23, a connecting slide rod 22, and a tool positioning frame 20. When the rotating base 3 drives the fixed assembly frame 4 to rotate clockwise, the drive wheel 24 is always pressed against the surface of the fixed static friction ring 12 due to the preload of the disc spring 23, and its outer edge slides relative to the surface. As a result, it is driven to rotate by the counterclockwise friction torque and drives the tool positioning frame 20 to rotate synchronously in the opposite direction through the three connecting slide rods 22. The tool positioning frame 20 achieves axial limitation and circumferential free rotation through the limiting ring block 21 and the annular slide groove 19 in the assembly sleeve 18. At the same time, the tool positioning servo cylinder 28 pushes the tool positioning block 27 with a soft buffer pad to clamp the tool and avoid damage to the cutting edge. This composite motion mechanism enables each tool to rotate in the opposite direction while revolving around the central axis, effectively eliminating the sputtering shadow effect. The measured coating thickness uniformity has been significantly reduced from 22% in the traditional single-revolution structure to below 9%, significantly improving coating uniformity, coverage and product consistency. It is especially suitable for high-quality antibacterial coating processing of tools with complex geometries.

[0036] Example 3 Specifically, such as Figure 7 As shown, the tool pretreatment assembly 6 includes a pretreatment frame 14. One side of the pretreatment frame 14 is threadedly connected to one side of the fixed assembly frame 4. The pretreatment frame 14 has an air flow channel inside. Several air nozzles 15 are evenly distributed on the outer circumferential surface of the pretreatment frame 14. The interior of each air nozzle 15 is connected to the interior of the air flow channel. Each air nozzle 15 is equipped with an electromagnetic control valve to independently control the opening and closing of the air jet inside each air nozzle 15. Fiber optic arrays 16 are also provided on the surface of the pretreatment frame 14 and on both sides of each air nozzle 15. The fiber optic arrays 16 are used to target and heat the cutting edge of the tool.

[0037] It should be noted that the air supply pipe 11 is a flexible metal corrugated pipe or a rigid stainless steel pipe, with one end connected to an external air source through a rotary joint; a mass flow controller and a solenoid valve are provided outside the coating chamber to achieve precise control of the gas type and flow rate; the gas enters the internal cavity of the fixed assembly frame 4 through the central through hole, and is then distributed to each air outlet 15 through the air flow channel of the pretreatment frame 14.

[0038] Furthermore, an RF coil 25 is fixedly installed inside one side of the fixed assembly frame 4, and a center electrode 26 is fixedly installed on the other side of the pretreatment frame 14, and the center electrode 26 is fixed by a ceramic sleeve.

[0039] It should be noted that the pretreatment frame 14 is connected to the fixed assembly frame 4 by threads, which facilitates maintenance and replacement; the interior is provided with annular or star-shaped air flow channels to evenly distribute compressed air or inert gas to each air outlet 15; the number of air outlets 15 corresponds one-to-one with the tool positioning assembly 5 to achieve targeted blowing; each air outlet 15 is equipped with an independent electromagnetic control valve, which can be selectively opened according to the tool position, which is energy-saving and precise; the air outlets 15 can spray compressed air, nitrogen or gas containing active ingredients to remove oil, moisture or activate surfaces.

[0040] Meanwhile, fiber arrays 16 are distributed on both sides of each air outlet 15 and consist of multiple infrared optical fibers; the fiber arrays 16 are connected to external laser or halogen light sources to perform local non-contact heating on the cutting edge area of ​​the tool; heating can promote surface desorption and increase the nucleation density of the coating, which is particularly suitable for the deposition of antibacterial coatings.

[0041] The RF coil 25 is made of 0.8mm diameter copper wire, wound 12 turns to form a ring-shaped induction coil, and installed in a groove on the inner wall of the fixed mounting bracket 4. One end of the RF coil 25 is connected to an external 13.56MHz RF power supply via a coaxial cable, and the other end is connected to the ground potential of the coating chamber via an RF grounding terminal. A polytetrafluoroethylene insulating gasket is provided between the RF coil 25 and the fixed mounting bracket 4 to prevent leakage. To reduce electromagnetic interference, an aluminum foil shielding layer is wrapped around the outside of the RF coil 25 and grounded via a metal bolt. The center electrode 26 is a stainless steel rod with a diameter of Φ6mm and a length of 20mm. One end of the rod extends out of the front end face of the pretreatment bracket 14 to approach the tool surface. The center electrode 26 is insulated from the pretreatment bracket 14 by an alumina ceramic sleeve. A metal shielding cover is provided on the outside of the ceramic sleeve to prevent arc breakdown. The other end of the center electrode 26 passes through the rear of the pretreatment bracket 14 and is connected to the high-voltage output terminal of the 13.56MHz RF power supply via an RF matching network.

[0042] The RF coil 25 and the center electrode 26 do not conduct electricity directly, but instead form an equivalent capacitance C through spatial capacitive coupling. When an alternating voltage is applied by the RF power supply, a strong alternating electric field is generated between the center electrode 26 and the RF coil 25, with an electric field strength reaching [insert value here]. Ar gas is introduced into the vacuum chamber, where electrons are accelerated in the electric field and collide with Ar atoms, triggering avalanche ionization and forming a localized high-density plasma. This plasma is concentrated within a 0.5-1.0 mm range on the tool surface, effectively removing organic contaminants and activating the metal surface to generate active groups, significantly improving the adhesion of subsequent coatings. A capacitive coupling structure is formed between the RF coil 25 and the central electrode 26. When 80W of RF power and 0.8Pa of Ar gas pressure are applied, high-density plasma is generated near the tool surface, effectively removing oil and activating the surface, thereby increasing the adhesion of the subsequent antibacterial coating to over 7.8N.

[0043] In summary, this embodiment further integrates a multi-functional tool pretreatment component 6. Its pretreatment frame 14 is threadedly connected to the fixed assembly frame 4, and has an internal airflow channel connected to multiple air outlets 15 with electromagnetic control valves, which can target specific tools for cleaning as needed. Fiber optic arrays 16 are arranged on both sides of the air outlets 15, using infrared light to locally heat the cutting edge to 100-300°C, promoting the desorption of contaminants. More importantly, an RF coil 25 is embedded in the fixed assembly frame 4, and a central electrode 26 insulated and encapsulated by an alumina ceramic sleeve is set in the center of the pretreatment frame 14. The two constitute a capacitively coupled plasma excitation structure. When 80W, 13.56MHz radio frequency power is applied in a 0.8PaAr atmosphere, high-density plasma can be generated within a range of 0.5-1.0mm on the tool surface, efficiently removing oil and activating the metal surface, thereby increasing the adhesion of the subsequent TiN / Ag antibacterial coating from 2.5N to over 7.8N. This integrated pretreatment module achieves the synergistic effects of cleaning, heating, and activation, completely solving the problem of insufficient adhesion caused by surface contamination before plating. It significantly improves the functionality, durability, and food safety compliance of the antibacterial coating, setting a new standard for PVD coating processes in high-end kitchen knives.

[0044] Example 4 Specifically, this embodiment proposes a working method for a fixing base used in antibacterial tool coating processing, including the following steps: Step S1: Insert several antibacterial cutting tools to be processed into multiple cutting tool positioning components 5 on the fixed assembly frame 4; by controlling the drive shaft of each cutting tool positioning servo cylinder 28 to extend, push the corresponding cutting tool positioning block 27 to move towards the center, so that the cutting tool is clamped inside the cutting tool positioning frame 20; wherein, the soft buffer pad on one side of the cutting tool positioning block 27 contacts the cutting tool to avoid pinching the cutting edge or damaging the surface.

[0045] Step S2: Activate the tool pretreatment assembly 6, control the air supply pipe 11 to introduce compressed air or high-purity Ar gas, which enters the internal cavity of the fixed assembly frame 4 through the central through hole of the rotating shaft 7, and is then distributed to each air outlet 15 through the air flow channel of the pretreatment frame 14; according to the tool position, selectively open the electromagnetic control valve in the corresponding air outlet 15 to perform targeted blowing on the surface of the target tool to remove floating dust and moisture; at the same time, activate the external infrared light source connected to the fiber array 16 to target and heat the tool cutting edge area, raising the local temperature to 100-3.5℃ to promote the desorption of organic pollutants; then, apply 13.56MHz, 80W radio frequency power to the RF coil 25 and the central electrode 26 to excite local plasma in a 0.8Pa Ar atmosphere, performing in-situ cleaning and activation of the tool surface for 30 seconds to generate active groups to improve the nucleation density of subsequent coatings.

[0046] Step S3: Start the rotary servo motor 10. Its output shaft drives one transmission wheel 8 to rotate, and drives another transmission wheel 8 and the rotating shaft 7 to rotate synchronously through the synchronous belt 9. The rotating shaft 7 drives the fixed assembly frame 4, the rotating base 3 and the tool it carries to revolve clockwise around the central axis of the coating chamber through the through hole 13. The revolution speed is set to 5-30 rpm. During the revolution, each drive wheel 24 is always pressed against the surface of the fixed static friction ring 12 by the preload of the disc spring 23. Its outer edge slides relative to the revolution and rotates counterclockwise under the action of friction. It drives the tool positioning frame 20 to rotate synchronously in the opposite direction through the three connecting slide rods 22, forming a compound motion of revolution and reverse rotation. At the same time, N2 or reaction gas containing Ag precursor is continuously introduced through the air supply pipe 11. In conjunction with the sputtering target, a TiN / Ag composite antibacterial coating is deposited on the tool surface.

[0047] Step S4: After the coating time reaches the preset value, turn off the RF power supply, infrared light source, gas supply and rotary servo motor 10 in sequence; after the rotating base 3 stops completely, control the retraction of each tool positioning servo cylinder 28 and release the tool positioning block 27; take out the antibacterial tool that has been coated and carry out subsequent quality inspection or packaging.

[0048] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fixed base for antibacterial knife coating processing, comprising a fixed mounting frame (1) disposed inside the coating chamber, an annular connecting frame (2) fixedly disposed on one side of the fixed mounting frame (1), and a rotating base (3) rotatably disposed on one side of the annular connecting frame (2), characterized in that, The fixed mounting bracket (1) has a rotating shaft (7) inside, and the rotating base (3) is threadedly connected to a fixed assembly bracket (4). The fixed assembly bracket (4) has a through hole (13) in its center. One end of the rotating shaft (7) is fixedly connected to the inside of the through hole (13). The fixed assembly bracket (4) also has a tool pretreatment component (6) in the middle of its front side. The tool pretreatment component (6) is used to clean the surface of the tool to be processed. The fixed assembly bracket (4) also has several tool positioning components (5) on one side for tool processing positioning. The tool positioning components (5) are arranged at equal angles about the central axis of the fixed assembly bracket (4). By using the tool positioning components (5) to process and position the tool to be processed, the tool to be processed is rotated around the central axis of the rotating base (3) under the drive of the rotating base (3), thereby realizing the batch coating and film processing of the tool.

2. The fixing base for antibacterial tool coating processing according to claim 1, characterized in that, Two drive wheels (8) are rotatably provided on one side of the back of the fixed mounting bracket (1), and the surfaces of the two drive wheels (8) are connected by a synchronous belt (9); the interior of one of the drive wheels (8) is fixedly connected to one end of the rotating shaft (7), and the interior of the rotating shaft (7) is provided with a central through hole through both ends. An air supply pipe (11) is rotatably provided inside the end of the rotating shaft (7) located inside the drive wheel (8), and one end of the air supply pipe (11) passes through the coating chamber and extends to the outside.

3. A fixing base for antibacterial tool coating processing according to claim 2, characterized in that, A rotary servo motor (10) is fixedly installed outside the coating chamber, and one end of the output shaft of the rotary servo motor (10) extends into the interior of the coating chamber. One end of the output shaft of the rotary servo motor (10) is fixedly connected to the interior of another transmission wheel (8).

4. A fixing base for antibacterial tool coating processing according to claim 1, characterized in that, The annular connecting frame (2) has a connecting groove on one side, and the rotating base (3) is slidably connected to the inside of the connecting groove on one side. At the same time, a number of sliding balls are also distributed in an annular pattern on one side of the rotating base (3), and the surfaces of the number of sliding balls are slidably connected to the inside of the connecting groove.

5. A fixing base for antibacterial tool coating processing according to claim 1, characterized in that, A static friction ring (12) is fixedly provided in the middle of one side of the fixed mounting bracket (1); the fixed assembly bracket (4) has a number of assembly thread holes (17) inside, and each of the assembly thread holes (17) is threadedly connected to an assembly sleeve (18), and each of the assembly sleeves (18) is rotatably provided with a tool positioning frame (20); three connecting slide rods (22) are slidably provided on one side inside the tool positioning frame (20), and a drive wheel (24) is fixedly provided at one end of each of the three connecting slide rods (22). Disc springs (23) are also sleeved on the surface of the three connecting slide rods (22), and the two ends of the disc springs (23) are in contact with the drive wheel (24) and one side of the tool positioning frame (20) respectively.

6. A fixing base for antibacterial tool coating processing according to claim 5, characterized in that, A limiting ring block (21) is fixedly provided on one side of the surface of the tool positioning frame (20), and an annular groove (19) that cooperates with the limiting ring block (21) is provided inside the mounting sleeve (18).

7. A fixing base for antibacterial tool coating processing according to claim 1, characterized in that, The tool positioning assembly (5) includes several tool positioning blocks (27) located inside the tool positioning frame (20). Several tool positioning servo cylinders (28) are fixedly provided on the outer peripheral surface of the tool positioning frame (20). The several tool positioning servo cylinders (28) are distributed at equal angles about the central axis of the tool positioning frame (20). One end of the drive shaft of the several tool positioning servo cylinders (28) is fixedly connected to one side of the several tool positioning blocks (27).

8. A fixing base for antibacterial tool coating processing according to claim 1, characterized in that, The tool pretreatment assembly (6) includes a pretreatment frame (14), one side of which is threadedly connected to one side of the fixed assembly frame (4), and the interior of the pretreatment frame (14) is provided with an air flow channel. Several air nozzles (15) are distributed at equal angles on the outer circumference of the pretreatment frame (14), and the interior of each air nozzle (15) is connected to the interior of the air flow channel. Each air nozzle (15) is provided with an electromagnetic control valve for independently controlling the opening and closing of the air jet inside each air nozzle (15). Fiber optic arrays (16) are also provided on the surface of the pretreatment frame (14) and on both sides of each air nozzle (15) to target the cutting edge of the tool through the fiber optic arrays (16).

9. A fixing base for antibacterial tool coating processing according to claim 8, characterized in that, An RF coil (25) is also fixed inside one side of the fixed assembly frame (4), and a center electrode (26) is fixed on the other side of the pretreatment frame (14), and the center electrode (26) is fixed by a ceramic sleeve.

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