A preparation system and method for a self-healing, wear-resistant protective film for metals.

Abstract

This invention discloses a preparation system and method for a self-healing wear-resistant protective film for metals. The system includes a mixing and grinding device, a homogenizing suspension preparation device, and a grinding and film-forming device. The mixing and grinding device is connected to the homogenizing suspension preparation device, which is also connected to the grinding and film-forming device. The grinding and film-forming device contacts the surface of the workpiece to be coated. The method includes fine grinding and mixing of different coarse powders, preparation of a homogenizing suspension, and grinding and film-forming device grinding the workpiece surface to ultimately form a self-healing wear-resistant protective film for metals. This invention is used to prepare self-healing wear-resistant protective films for metals, ensuring a continuous preparation process, improving film-forming efficiency. Furthermore, it allows for preparation and film-on-demand, avoiding the problem of heterogeneity caused by prolonged static storage of the prepared homogenizing suspension, and preventing waste of the homogenizing suspension. This invention is applicable to the technical field of wear-resistant protective film processing.

Description

Technical Field

[0001] This invention belongs to the technical field of wear-resistant protective film processing, specifically, it relates to a preparation system and method for a metal self-healing wear-resistant protective film. Background Technology

[0002] Currently, to improve the wear resistance of bridge bearings and prevent excessive wear that could affect the overall structural strength and stability of the bridge, appropriate treatments are necessary. A common approach is to change the material of the bridge bearings, replacing the existing material with an alloy material that has higher wear resistance. While feasible, this method is complex to manufacture and extremely costly, hindering its widespread adoption. Another approach involves coating the friction surfaces of the existing bridge bearings with a wear-resistant plate or chrome plating. When relative friction occurs, the wear-resistant plate or chrome plating initially bears the brunt of the friction. This method effectively improves the wear resistance of the bridge bearings. However, over prolonged friction, because the wear-resistant plate or chrome plating is not permeable to the bearing surface, it can wear down, exposing the bearing surface or even flaking off, thus reducing the wear resistance of the bridge bearings. Moreover, the chrome plating process pollutes the environment and requires a large investment in wastewater treatment, which significantly increases costs. Summary of the Invention

[0003] This invention provides a preparation system and method for a self-healing wear-resistant protective film for metals, which makes the entire preparation process continuous during film formation, improves film formation efficiency, and allows for preparation on demand, avoiding the problem of heterogeneity caused by prolonged standing of the prepared homogeneous suspension, while also avoiding waste of the homogeneous suspension.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A system for preparing a self-healing wear-resistant protective film for metal includes a mixing grinding device, a homogenizing suspension preparation device, and a grinding film forming device. The outlet of the mixing grinding device is connected to the powder inlet of the homogenizing suspension preparation device through a first hose, and the mixing liquid outlet of the homogenizing suspension preparation device is connected to the inlet of the grinding film forming device through a second hose. The grinding film forming device is mounted on a robotic arm, and the lower part of the grinding film forming device is in contact with the surface of the workpiece to be coated.

[0006] Furthermore, the mixing and grinding device includes a vertically arranged mixing and grinding cylinder, with a feed hood whose diameter gradually decreases upward along its axis at the upper end of the mixing and grinding cylinder, and an upper end cover detachably connected to the upper end of the feed hood. Multiple feed oblique flow pipes are uniformly connected to the feed hood along its circumference. A discharge hood whose diameter gradually decreases downward along its axis is detachably connected to the lower end of the mixing and grinding cylinder, and a mixed powder outlet connector is constructed at the lower end of the discharge hood. A flow-guiding ball mill mechanism is installed in the reactor body formed by the mixing and grinding cylinder, the feed hood, and the discharge hood.

[0007] Furthermore, the flow-guiding ball mill mechanism includes a reversible flow-guiding component, a ball milling powder component, and a transmission rod. The reversible flow-guiding component and the ball milling powder component are respectively disposed inside the mixing and grinding cylinder and the discharge hood. The lower end of the transmission rod extends into the mixing and grinding cylinder from the upper end cover along the axis of the mixing and grinding cylinder, and the transmission rod is connected to the reversible flow-guiding component and the ball milling powder component respectively. A first transmission wheel is coaxially mounted on the upper end of the transmission rod.

[0008] Furthermore, the variable-direction diversion assembly includes a fixed base coaxially fixedly connected to the transmission rod, and a dispersive diversion impeller and a cohesive diversion impeller are sequentially fixed downward along the vertical direction on the fixed base, and the outer edges of the dispersive diversion impeller and the cohesive diversion impeller are rotatably connected to the inner wall of the mixing and crushing cylinder.

[0009] Furthermore, the ball mill powder assembly includes a feed disc with a recessed center, the feed disc being covered with feed holes, and the lower end of the transmission rod being fixedly connected to the center of the feed disc. A ball milling cylinder is constructed at the lower end of the feed disc, the lower end of the ball milling cylinder being closed, and the upper end of the ball milling cylinder being fixedly connected to the lower surface of the feed disc. Multiple grinding balls are arranged inside the ball milling cylinder. A conical impeller is fixedly fitted outside the ball milling cylinder, and the annular gap between the conical impeller and the discharge hood forms a discharge chamber.

[0010] Furthermore, the homogenized suspension preparation device includes a vertically arranged mixing vessel, which includes a primary vessel and a secondary vessel arranged sequentially upwards in the vertical direction. The primary vessel and the secondary vessel are separated by a powder dispensing component. The primary vessel is connected to the secondary vessel via a bypass pipe. A liquid outlet connector is constructed at the lower part of the secondary vessel, and the liquid outlet connector is connected to one end of a second flexible hose.

[0011] Furthermore, the powder dispensing assembly includes a powder inlet pipe extending downwards along the axis of the secondary vessel to the upper end of the primary vessel. The upper end of the powder inlet pipe is connected to the end of the first flexible tube, and the lower end of the powder inlet pipe is equipped with a vortex powder outlet. The diameter of the vortex powder outlet gradually decreases downwards in the vertical direction, and multiple vortex orifices are evenly formed on the peripheral wall of the vortex powder outlet. A first annular tube is sleeved on the upper part of the primary vessel, and multiple first vortex tubes are evenly connected to the first annular tube along its circumference. Each first vortex tube is connected to the primary vessel. The upper peripheral wall of the primary reactor body is connected, and a first connector is constructed on the first annular tube; a mixing shroud with a gradually decreasing diameter along the vertical direction is constructed on the upper part of the secondary reactor body, and a second annular tube is installed on the outer sleeve of the mixing shroud. Multiple second swirl tubes are evenly connected along the circumference of the second annular tube, and each second swirl tube is connected to the peripheral wall of the mixing shroud. A second connector is constructed on the second annular tube; a discharge pipe is constructed at the lower end of the primary reactor body, one end of the bypass pipe is connected to the discharge pipe, and the other end of the bypass pipe is connected to the second connector.

[0012] Furthermore, the grinding and film-forming device includes a shaft, an adapter sleeve, an assembly base, and a grinding head. The adapter sleeve is fixedly installed on a connecting base, which is connected to a robotic arm. One end of the adapter sleeve is connected to the second flexible tube. One end of the shaft passes through the adapter sleeve and is detachably connected to the assembly base. The shaft and the adapter sleeve have the same axis and are rotatably connected. The grinding head is detachably connected to the end of the assembly base away from the shaft. A second transmission wheel is coaxially mounted on the end of the shaft away from the assembly base. A liquid cavity is constructed inside the grinding head. Multiple liquid outlet holes are evenly opened along the circumference on the upper peripheral wall of the grinding head. Each liquid outlet hole is connected to the liquid cavity. A guide channel communicating with the adapter sleeve and the liquid cavity is opened inside the shaft.

[0013] Furthermore, a connector flange is constructed at the end of the assembly base away from the grinding head, and a flow guide hole is provided on the connector flange. A conical assembly groove is provided at the center of the end of the assembly base away from the connector flange. The two ends of the flow guide hole are respectively connected to the flow guide channel and the conical assembly groove. A splash guard is coaxially constructed at the edge of the assembly base. An annular splash guard cavity is formed between the splash guard and the corresponding peripheral wall of the grinding head. An annular flow gap is formed at the lower end of the annular splash guard cavity. Each of the liquid outlet holes is connected to the annular splash guard cavity. An installation groove is provided at the center of the end of the grinding head near the assembly base. A conical valve head is installed in the conical assembly groove. A columnar spring is connected to the end of the conical valve head near the grinding head. The end of the columnar spring away from the conical valve head is connected to the installation groove. An adjusting rod is movably connected to the conical valve head from the end of the grinding head away from the assembly base through the installation groove and the columnar spring. The adjusting rod is threadedly connected to the grinding head.

[0014] This invention also discloses a method for preparing a metal self-healing wear-resistant protective film using the above-mentioned metal self-healing wear-resistant protective film preparation system, comprising the following steps:

[0015] S1. Simultaneously supply multiple coarse powders with different components and proportions to the mixing grinding device;

[0016] S2. Simultaneously start the mixing and grinding device, where these coarse powders are gradually finely ground and mixed.

[0017] S3. Control the pressure inside the mixing grinding device according to the output of the mixing grinding device and the pressure inside the homogeneous suspension equipment.

[0018] S4. Inject the base liquid with a predetermined pressure into the homogenized suspension preparation device, so that the base liquid and the mixed fine powder entering the homogenized suspension preparation device are fully mixed to form a homogenized suspension.

[0019] S5. The obtained homogeneous suspension enters the grinding and film-forming device and is continuously supplied to the surface of the workpiece to be film-forming.

[0020] S6. Control the actions of the grinding film forming device and the robot arm so that the grinding film forming device grinds the surface of the workpiece coated with homogeneous suspension until a layer of metal self-healing wear-resistant protective film is formed on the surface of the workpiece.

[0021] The technological advancements achieved by this invention compared to existing technologies, due to the aforementioned structure, are as follows: When improving the wear resistance of the corresponding surface of a bridge bearing, this invention requires coating the prepared homogeneous suspension onto the surface of the bridge bearing to be ground. The surface is then continuously ground using a grinding film-forming device, causing the effective components in the homogeneous suspension to undergo micro-metallurgical processes on the bridge bearing surface, forming a ceramic-like self-healing wear-resistant protective film. Thus, throughout the grinding process, the coated homogeneous suspension needs to maintain a homogeneous state. To maintain homogeneity, this invention employs a method of immediate preparation and use to avoid sedimentation and heterogeneity. This invention utilizes a hybrid grinding device to pulverize and mix matrices of different types and components, ensuring that the particle size of these matrices falls within a predetermined range. The fully mixed components are then gradually introduced under positive pressure into a homogenized suspension preparation device, where they are thoroughly mixed with the base liquid gradually injected into the homogenized suspension preparation device, forming a homogenized suspension. This homogenized suspension is then supplied under positive pressure to a grinding and film-forming device, which is driven to grind the surface of the bridge bearing. During the grinding process, the homogenized suspension is gradually coated onto the surface of the bridge bearing to be ground. A robotic arm adjusts the grinding angle and the spinning pressure of the grinding and film-forming device on the surface to be ground, allowing the effective components in the homogenized suspension to undergo micro-metallurgical treatment on the surface of the bridge bearing to be ground, thereby forming a ceramic-like self-healing wear-resistant protective film. This self-healing wear-resistant protective film for metals, due to its ceramic morphology and high smoothness, effectively reduces the frictional force it bears. Furthermore, as the outer surface of the film thins under friction, the heat and frictional force cause the exposed surface to undergo micro-metallurgy, continuing to form a smooth ceramic-like outer surface. This prevents a decrease in the overall wear resistance of the film. In summary, this invention can efficiently prepare self-healing wear-resistant protective films for metals, maintaining a continuous preparation process, improving film-making efficiency, and allowing for immediate preparation, avoiding the inhomogenization problems that arise from prolonged static standing of the homogeneous suspension. It also prevents waste of the homogeneous suspension and environmental pollution during the preparation process. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0023] In the attached diagram:

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the hybrid grinding device according to an embodiment of the present invention;

[0026] Figure 3 This is an axial structural cross-sectional view of the hybrid grinding device according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the hybrid grinding device of the present invention after removing the flow-guiding ball mill mechanism;

[0028] Figure 5 This is a schematic diagram of the flow-guiding ball mill mechanism in the hybrid grinding device of this invention.

[0029] Figure 6 This is a partial structural cross-sectional view of the ball milling powder assembly in the flow-type ball milling mechanism according to an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the reversible flow diversion component in the flow diversion ball mill mechanism according to an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the conical impeller in the ball mill powder assembly according to an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of the homogenized suspension preparation device according to an embodiment of the present invention;

[0033] Figure 10 This is a schematic diagram of the homogenized suspension equipment device from another angle according to an embodiment of the present invention;

[0034] Figure 11 This is an axial structural cross-sectional view of the homogeneous suspension equipment according to an embodiment of the present invention;

[0035] Figure 12 This is a schematic diagram of the grinding and film-forming apparatus according to an embodiment of the present invention;

[0036] Figure 13 This is an axial structural cross-sectional view of the grinding and film-forming apparatus according to an embodiment of the present invention;

[0037] Figure 14 This is an exploded view of the grinding and film-forming apparatus of an embodiment of the present invention after removing the adapter sleeve and connecting seat;

[0038] Figure 15 This is a schematic diagram of the assembly base in the grinding and film forming apparatus according to an embodiment of the present invention;

[0039] Figure 16 This is an electron micrograph of the metal self-healing wear-resistant protective film according to an embodiment of the present invention;

[0040] Figure 17This is an electron microscopy compositional analysis diagram of the metal self-healing wear-resistant protective film according to an embodiment of the present invention;

[0041] Figure 18 This is a graph showing the effect of grinding line speed on film thickness in an embodiment of the present invention;

[0042] Figure 19 This is a graph showing the effect of counterweight on film thickness in an embodiment of the present invention;

[0043] Figure 20 This is a graph showing the relationship between film thickness and polishing time in an embodiment of the present invention;

[0044] Figure 21 This is a graph showing the effect of grinding line speed on surface roughness in an embodiment of the present invention.

[0045] Components labeled: 100-Mixing grinding device, 101-Mixing and crushing cylinder, 102-Feed hood, 103-Upper end cover, 104-Discharge hood, 105-Swirl-type air mill mixing chamber, 106-Drainage chamber, 107-Discharge chamber, 108-Feed inclined pipe, 109-Regulating valve, 110-Drive rod, 111-First drive wheel, 112-Reversing drainage assembly, 1121-Fixed base, 1122-Dispersing drainage impeller, 1123-Gathering drainage impeller, 113- 114-Ball mill cylinder, 115-Connecting rib, 116-Conical impeller, 117-Mixed powder outlet connector, 200-Homogeneous suspension preparation device, 201-Secondary reactor body, 202-Mixing hood, 203-Primary reactor body, 204-Powder inlet pipe, 205-Powder inlet valve, 206-Connecting gas pipe, 207-Pressure control valve, 208-Discharge pipe, 209-Discharge valve, 210-First annular pipe, 211-First cyclone pipe, 212-First connector, 213 214-Bypass pipe, 215-Second valve body, 216-Second connector, 217-Second annular pipe, 218-Second cyclone pipe, 219-Liquid outlet connector, 220-Liquid outlet valve, 221-Cyclone powder outlet, 222-Powder outlet chamber, 223-Cyclone port, 224-Secondary mixing chamber, 225-Primary mixing chamber, 300-First hose, 400-Grinding and film forming device, 401-Shaft, 402-Connecting port, 403-Connecting flange, 404-Second Drive wheel, 405-flow guide channel, 406-adapter sleeve, 407-adapter cavity, 408-connecting seat, 409-assembly seat, 410-joint flange, 411-flow guide hole, 412-conical assembly groove, 413-splash guard ring, 414-grinding head, 415-liquid cavity, 416-liquid outlet, 417-annular splash guard cavity, 418-flow gap, 419-mounting groove, 420-column spring, 421-conical valve head, 422-adjusting rod, 500-second hose. Detailed Implementation

[0046] The preferred embodiments of the present invention will now be described with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0047] This invention discloses a self-healing wear-resistant protective film for metals, which is made of Mg6Si4O 10 This material is composed of various mineral powders such as (OH)8, Al2O3, SiO2, Fe2O3, CaO, and MgO, as well as additives and catalysts. It does not chemically react with oils, does not alter the viscosity or properties of the oils, has no toxic side effects, and is chemically very stable at room temperature. In the preparation of a self-healing, wear-resistant protective film for metals, the physical changes that occur on the friction surface of the substrate (bridge bearing) in the homogeneous suspension clean and finely grind the metal surface. During film formation, the surface of the substrate is rubbed. The powder material in the homogeneous suspension is still a large particle relative to the pits and protrusions of the substrate's friction surface. After being carried into the friction surface of the substrate, it may be further ground and refined. During the grinding and refining process, the chemical reaction of particles on the surface of the base metal occurs. Ultrafine powder and lubricant accumulate on the surface of the base metal and undergo a unique micro-metallurgical process under the action of rolling or spinning grinding. This process is driven by the heat energy of grinding, which causes Mg atoms in the microparticle crystals to react with Fe atoms on the surface of the base metal, generating new iron silicate crystals with larger volume on the working surface of the base metal. Finally, a glass-ceramic protective layer is formed with Fe base metal bonded by chemical bonds.

[0048] During the development process, the spinning and rolling tooling and samples were tested to verify the physicochemical properties of the processed surface. The test results of the novel wear-free glass-ceramic protective film are as follows:

[0049] Film thickness: greater than 10 μm;

[0050] Coefficient of friction (silicone grease lubrication): ≤0.01;

[0051] Surface roughness: Ra≤8μm;

[0052] Surface hardness: HV350 higher than the non-film-forming surface of the substrate.

[0053] like Figure 16 As shown, the thickness of the self-healing wear-resistant protective film on metal is greater than 10 μm. Figure 17 The image shows an electron microscopy compositional analysis of the metal self-healing wear-resistant protective film after its formation, revealing more accurate composition and proportions.

[0054] The self-healing, wear-resistant protective film for metals of this invention, after scientific research and sample testing, fully demonstrates its superiority, enabling the bearing friction pair to possess excellent physical properties and chemical stability. Employing novel materials and processes, it can replace conventional welded stainless steel plates and chrome plating processes, improving the bearing friction condition, saving material costs while improving quality, and being more environmentally friendly. Its significant competitive advantage makes it widely applicable and worthy of promotion.

[0055] The economic benefits of this invention are analyzed as follows:

[0056] There are two existing processing techniques for bearing friction surfaces: one is chrome plating on the steel surface, and the other is covering the steel plate with stainless steel. However, both methods have their shortcomings. This invention addresses market pain points by developing a new processing technology aimed at improving bearing performance and service life, and solving problems related to cost, procedures, quality, and environmental impact associated with the old processes.

[0057] The self-healing wear-resistant protective film and its processing technology are designed and applied using domestically sourced materials. The required grinding materials and tooling materials, such as cast steel parts and steel plates, are all domestically produced, with reliable and stable supply channels to meet the needs of product and process promotion. For producing the same specifications of supports, with other raw materials remaining the same, for every 2.5 square meters of production area, comparing the cost of stainless steel plates (3mm thick, current market price of 316 stainless steel at 31 yuan / kg), the cost of stainless steel plates is 2.5m² × 3mm × 7.9dm³ / kg × 31 yuan / kg = 1836.8 yuan. Using the self-healing wear-resistant protective film process, the same volume of steel is required, with a market price of 5 yuan / kg. The cost of the base steel is 2.5m² × 3mm × 7.85dm³ / kg × 5 yuan / kg = 294.4 yuan. Each 2.5 square meters requires 100g of grease-based grinding material, costing approximately 200 yuan, for a total raw material cost of 494.4 yuan. Therefore, it is clear that it has an absolute advantage in terms of cost. The technology of this invention mainly utilizes various minerals, catalytic materials, film-forming agents, extreme pressure materials, and auxiliary materials, all of which are ultrafine powders of various natural minerals. This process is pollution-free, and the resulting glass-ceramic layer exhibits superior performance. It can replace stainless steel cladding or chrome plating, avoiding the issues of welded stainless steel defects or uneven coating thickness affecting the coefficient of friction. The process avoids or reduces welding steps, minimizing welding fume generation and emissions, and does not require specialized environmental certifications for the electroplating industry. Through process innovation, it reduces pollutant emissions during production, decreasing the total amount of pollutants requiring end-of-pipe treatment and reducing environmental costs.

[0058] Material selection for preparing the self-healing wear-resistant protective film for metals in this invention:

[0059] Catalysts: Cesium chloride, palladium chloride, etc.

[0060] Accelerators: Red phosphorus, mixed rare earth elements, fluorinated carbon, cerium, lanthanum

[0061] Film-forming agents: manganese dioxide, pyrolusite, etc.

[0062] Dispersant: T154, coating solution, calcium dodecyl sulfonate, potassium oleate, dodecyl hydroxystearate

[0063] Metal powders: Nano-sized copper powder, micron-sized brass powder

[0064] Multiple mineral powders:

[0065] ① Silicates: Wollastonite, Talc, Kaolinite, Tremolite, Actinolite, Jadeite, Mica, Graphite

[0066] ② Halides: fluorite, fluorite, graphite

[0067] ③ Nano-silicon powder: Diamond powder

[0068] ④ Synthetic powders: Phosphorus silicon powder, sodium phosphide silicon powder, molybdenum disulfide

[0069] ⑤ Ceramic raw materials: pyrophyllite, feldspar, wollastonite, diopside

[0070] Solid lubricants and friction reducers: graphite, platinum disulfide, melamine cyanurate, polytetrafluoroethylene, boron carbide

[0071] Antioxidant and corrosion inhibitors: dialkyl dithiophosphate, dialkyl dithiocarbamate rust inhibitors and extreme pressure additives (omitted)

[0072] Analysis of the formation principle of self-healing wear-resistant protective film on metal:

[0073] The metal self-healing wear-resistant protective film generation technology uses lubricating oil or grease as a carrier to deliver fine powder particles of wear-free reactive layer material to the working surface of the friction component. Through the high temperature and pressure generated during the operation of the friction pair, the fine inorganic powder adheres and grows on the surface of the friction pair substrate and reacts chemically with the substrate metal to generate a ceramic-like protective layer on the substrate surface. This improves the strength, hardness, and plasticity of the metal, realizes online strengthening of the friction pair, and enhances the load-bearing capacity and wear resistance of the friction pair.

[0074] Its reaction with the base metal can be represented as:

[0075] Nx + M + Z + C + F + CM = Ny + Mx + Q

[0076] In the formula: Nx represents oxides, halides, etc.;

[0077] M is a metal reducing agent (Mg, Al, Ca, etc.);

[0078] Z is a nonmetal or a nonmetal compound (N, C, SiO, etc.);

[0079] C represents a catalyst (cesium chloride, mixed rare earth elements);

[0080] F is a promoter (red phosphorus, nitrocellulose, cerium lanthanum fluorocarbon), which generates heat during friction and promotes the reaction synthesis;

[0081] CM is a film-forming agent (manganese dioxide, pyrolusite, etc.) that reacts metals and compounds to form a film;

[0082] Ny is a compound;

[0083] Mx is a compound of metal reducing agents;

[0084] Q represents the heat released during the chemical reaction.

[0085] The homogenized suspension provided in this invention can be prepared in several ways:

[0086] 1. It is composed of 20 parts by weight of serpentine, 20 parts by weight of wollastonite, 1 part by weight of cesium chloride, 20 parts by weight of nano glass powder catalyst auxiliary, 3 parts by weight of red phosphorus accelerator, and 30 parts by weight of bentonite, wherein the particle size of nano glass powder, red phosphorus and bentonite is less than 10 micrometers; the dispersant is a coating liquid, the dispersion medium is machine oil, and the powder material and liquid material are mixed in a ratio of 1:4.

[0087] 2. It is composed of 20 parts by weight of serpentine, 24 parts by weight of talc, 10 parts by weight of graphite, 20 parts by weight of tremolite, 5 parts by weight of molybdenum disulfide, 5 parts by weight of polytetrafluoroethylene powder, 1 part by weight of cesium chloride, 3 parts by weight of cerium lanthanum fluorocarbon, 2 parts by weight of pyrolusite powder, and 15 parts by weight of silicon phosphide, wherein the particle size of molybdenum disulfide, cerium lanthanum fluorocarbon and silicon phosphide is less than 10 micrometers; the dispersion medium is machine oil solution, and the powder material and liquid material are mixed in a ratio of 1:5.

[0088] 3. It is composed of 20 parts by weight of serpentine, 5 parts by weight of jadeite, 1 part by weight of cesium chloride, 3 parts by weight of pyrophyllite, 10 parts by weight of muscovite, 13 parts by weight of graphite, 5 parts by weight of lithium stearate, 5 parts by weight of mixed rare earth elements, 15 parts by weight of trichlorocyanuric acid, 3 parts by weight of red phosphorus, and 10 parts by weight of calcium carbonate, wherein the particle size of lithium stearate, red phosphorus, and calcium carbonate is less than 10 micrometers; the dispersion medium is lithium silicate solution, and the powder material and liquid material are mixed in a ratio of 1:6.

[0089] This invention also discloses a system for preparing a self-healing, wear-resistant protective film for metals, such as... Figure 1-15As shown, the device includes a mixing grinding device 100, a homogenizing suspension preparation device 200, and a grinding film forming device 400. The outlet of the mixing grinding device 100 is connected to the powder inlet of the homogenizing suspension preparation device 200 through a first hose 300. The mixing liquid outlet of the homogenizing suspension preparation device 200 is connected to the inlet of the grinding film forming device 400 through a second hose 500. The grinding film forming device 400 is mounted on a robotic arm, and the lower part of the grinding film forming device 400 is in contact with the surface of the workpiece to be film formed.

[0090] This invention also discloses a method for preparing a metal self-healing wear-resistant protective film using the above-mentioned metal self-healing wear-resistant protective film preparation system, comprising the following steps:

[0091] S1. Simultaneously supply multiple coarse powders with different components and proportions to the mixing grinding device 100;

[0092] S2. Simultaneously start the mixing and grinding device 100, and gradually grind and mix these coarse powders in the mixing and grinding device 100;

[0093] S3. Control the pressure inside the mixing grinding device 100 according to the output of the mixing grinding device 100 and the pressure inside the homogeneous suspension equipment 200.

[0094] S4. Inject the base liquid with a predetermined pressure into the homogenizing suspension preparation device 200, so that the base liquid and the mixed fine powder entering the homogenizing suspension preparation device 200 are fully mixed and a homogenizing suspension is formed.

[0095] S5. The obtained homogeneous suspension enters the grinding and film-forming device 400 and is continuously supplied to the surface of the workpiece to be film-forming.

[0096] S6. Control the actions of the grinding film forming device 400 and the robot arm so that the grinding film forming device 400 grinds the surface of the workpiece coated with homogeneous suspension until a layer of metal self-healing wear-resistant protective film is formed on the surface of the workpiece.

[0097] The working principle and advantages of this invention are as follows: When improving the wear resistance of the corresponding surface of a bridge bearing, the present invention requires coating the prepared homogeneous suspension onto the surface of the bridge bearing to be ground. The surface is then continuously ground by the grinding film forming device 400, causing the effective components in the homogeneous suspension to undergo micro-metallurgy on the surface of the bridge bearing and form a ceramic-like self-healing wear-resistant protective film. Thus, during the entire grinding process, the coated homogeneous suspension needs to maintain a homogeneous state. To maintain homogeneity, the present invention employs a method of preparing and using the solution immediately to avoid sedimentation and heterogeneity. This invention uses a mixing grinding device 100 to pulverize and mix matrices of different types and components, ensuring that the particle size of these matrices is within a predetermined range. The fully mixed materials are gradually introduced into a homogenized suspension preparation device 200 under positive pressure and thoroughly mixed with the base liquid gradually injected into the homogenized suspension preparation device 200 to form a homogenized suspension. This homogenized suspension is then supplied under positive pressure to a grinding and film-forming device 400, which is driven to grind the surface of the bridge bearing. During the grinding process, the homogenized suspension is gradually coated onto the surface of the bridge bearing to be ground. The grinding angle and the spinning pressure of the grinding and film-forming device 400 on the surface to be ground are adjusted by a robotic arm, allowing the effective components in the homogenized suspension to perform micro-metallurgy on the surface of the bridge bearing to be ground, thereby forming a ceramic-shaped metal self-healing wear-resistant protective film. This self-healing wear-resistant protective film for metals, due to its ceramic morphology and high smoothness, effectively reduces the frictional force it bears. Furthermore, as the outer surface of the film thins under friction, the heat and frictional force cause the exposed surface to undergo micro-metallurgy, continuing to form a smooth ceramic-like outer surface. This prevents a decrease in the overall wear resistance of the film. In summary, this invention can efficiently prepare self-healing wear-resistant protective films for metals, maintaining a continuous preparation process, improving film-making efficiency, and allowing for immediate preparation, avoiding the inhomogenization problems that arise from prolonged static standing of the homogeneous suspension. It also prevents waste of the homogeneous suspension and environmental pollution during the preparation process.

[0098] As a preferred embodiment of the present invention, such as Figure 2-8As shown, the mixing and grinding device 100 includes a mixing and grinding cylinder 101, a feed hood 102, an upper cover 103, a discharge hood 104, and a flow-guiding ball mill mechanism. The mixing and grinding cylinder 101 is vertically arranged, and its inner cavity is a flow-guiding cavity 106. The feed hood 102 is constructed at the upper end of the mixing and grinding cylinder 101, and its diameter gradually decreases upward along the axis of the mixing and grinding cylinder 101. The inner cavity of the feed hood 102 is a vortex-type air mill mixing cavity 105. The upper cover 103 is detachably connected to the upper end of the feed hood 102. Multiple feed oblique flow pipes 108 are evenly connected along the circumference of the feed hood 102, and a regulating valve 109 is installed on each feed oblique flow pipe 108. In this embodiment, the discharge hood 104 is detachably connected to the lower end of the mixing and grinding cylinder 101. The discharge hood 104 gradually narrows in diameter downwards along the axis of the mixing and grinding cylinder 101, and a mixed powder outlet connector 117 is constructed at the lower end of the discharge hood 104. The mixed powder outlet connector 117 is connected to one end of the first flexible hose 300. In this embodiment, the mixing and grinding cylinder 101, the feed hood 102, and the discharge hood 104 constitute a reactor body, and the flow-guiding ball mill mechanism is installed inside the reactor body. The flow-guiding ball mill mechanism of this embodiment includes a reversible flow-guiding component 112, a ball milling powder component, and a transmission rod 110. The reversible flow-guiding component 112 is disposed inside the mixing and grinding cylinder 101, the ball milling powder component is disposed inside the discharge hood 104, and the lower end of the transmission rod 110 extends into the mixing and grinding cylinder 101 from the upper end cover 103 along the axis of the mixing and grinding cylinder 101. The transmission rod 110 is connected to the reversible flow-guiding component 112 and the ball milling powder component, respectively. A first transmission wheel 111 is coaxially mounted on the upper end of the transmission rod 110. The working principle and advantages of this embodiment are as follows: The first transmission wheel 111 is driven to rotate, causing it to drive the directional flow guiding assembly 112 and the ball mill powder assembly to rotate via the transmission rod 110. Different powders pass through corresponding feed oblique flow pipes 108, and the opening of the corresponding regulating valves 109 is adjusted so that the amount of material flowing through different feed oblique flow pipes 108 is different. Under the guidance of the directional flow guiding assembly 112, the material gradually swirls into the swirl-type air mill mixing chamber 105. Furthermore, to improve the powder entry efficiency and the pressure inside the vessel, the inlet end of the feed oblique flow pipe 108 can be pressurized (generally...). The method employed is to introduce pressurized gas, which causes different powders entering the vortex air mill mixing chamber 105 to swirl and mix. The particles rub and collide with each other, thus completing the air milling. Afterward, the mixed powder is guided by the deflecting flow component 112, which further mixes the different materials and enters the ball mill powder component. The ball mill powder component ball mills the mixture, thereby making the particle size of the mixture reach the predetermined range. The mixture after fine grinding is discharged through the mixed powder outlet connector 117 and then enters the homogenized suspension preparation device 200 through the first hose 300.

[0099] As a preferred embodiment of the present invention, such as Figure 3 , 5 As shown in Figure 7, the variable-direction diversion assembly 112 includes a fixed base 1121, a dispersing diversion impeller 1122, and a converging diversion impeller 1123. The fixed base 1121 is fixedly connected to the transmission rod 110, and the axes of the fixed base 1121 and the transmission rod 110 coincide. The dispersing diversion impeller 1122 and the converging diversion impeller 1123 are sequentially fixed downwards along the vertical direction on the fixed base 1121, and the outer edges of both the dispersing diversion impeller 1122 and the converging diversion impeller 1123 are rotatably connected to the inner wall of the mixing and crushing cylinder 101. In this embodiment, during the rotation of the drive rod 110, the drive rod 110 drives the direction-changing flow guiding assembly 112 to rotate. The direction-changing flow guiding assembly 112 guides the mixture passing through the flow guiding chamber 106. Specifically, the dispersing flow guiding impeller 1122 guides the mixture and causes it to swirl downwards and outwards, dispersing it. The cohesive flow guiding impeller 1123 then swirls and coheses the dispersed mixture. In this way, the materials in the mixture are once again air-milled and mixed, and efficiently supplied to the ball mill powder assembly. Figure 5 , 6As shown in Figure 8, the ball mill powder assembly includes a feed pan 113, a ball mill cylinder 114, and a conical impeller 116. The feed pan 113 has a concave center and is covered with feed holes to facilitate the smooth passage of the mixture from the deflecting flow assembly 112 through the feed pan 113. The lower end of the transmission rod 110 is fixedly connected to the center of the feed pan 113. In this embodiment, the ball milling cylinder 114 is constructed at the lower end of the feed pan 113. The upper end of the ball milling cylinder 114 is fixedly connected to the lower surface of the feed pan 113, and the axis of the ball milling cylinder 114 coincides with that of the feed pan 113. Multiple connecting ribs 115 are uniformly arranged along the circumference on the inner wall of the ball milling cylinder 114. Each connecting rib 115 extends from the upper end of the ball milling cylinder 114 to the lower end of the ball milling cylinder 114, forming a ball milling cavity inside the ball milling cylinder 114. The lower end of the ball milling cylinder 114 is closed, and multiple grinding balls are arranged inside the ball milling cylinder 114. In this embodiment, the conical impeller 116 is sleeved outside the ball mill cylinder 114, and the lower end of the conical impeller 116 is fixedly connected to the lower outer wall of the ball mill cylinder 114. The annular gap between the conical impeller 116 and the discharge hood 104 forms a discharge chamber 107, and the lower end of the discharge chamber 107 is connected to the mixed powder outlet connector 117. In this embodiment, the transmission rod 110 is driven to rotate the ball mill powder assembly. During the rotation of the ball mill powder assembly, the grinding balls in the ball mill cylinder 114 ball mill the mixture entering the ball mill cylinder 114, thereby further refining the particle size of the mixture and forming a mixture with the required particle size. Under the combined action of the positive pressure of the reactor body, the deflecting flow assembly 112, and the conical impeller 116, the mixture smoothly passes through the ball mill cylinder 114 into the discharge chamber 107 and is finally discharged from the mixed powder outlet connector 117. Furthermore, throughout the process, the grinding balls collide with the ball mill cylinder 114, causing the cylinder to vibrate. Simultaneously, the conical impeller 116 scrapes the outer wall of the ball mill cylinder 114, thus preventing the holes in the cylinder from becoming blocked and ensuring that the mixture can smoothly enter the discharge chamber 107. This embodiment uses a combination of air milling and ball milling to finely grind and mix different materials, improving the efficiency of fine grinding and mixing.

[0100] As a preferred embodiment of the present invention, such as Figure 9-11As shown, the homogenizing suspension preparation device 200 includes a mixing vessel and a powder dispensing assembly. The mixing vessel is vertically positioned, and the powder dispensing assembly is disposed within it. The mixing vessel comprises a primary vessel body 203 and a secondary vessel body 201, both integrally formed, arranged vertically upwards. The primary vessel body 203 has an inner cavity that forms a primary mixing chamber 225, and the secondary vessel body 201 has an inner cavity that forms a secondary mixing chamber 224. The primary mixing chamber 225 and the secondary mixing chamber 224 are separated by the powder dispensing assembly. The primary vessel body 203 is connected to the secondary vessel body 201 via a bypass pipe 214. A liquid outlet connector 219 is constructed at the lower part of the secondary vessel body 201, and a liquid outlet valve 220 is installed on the liquid outlet connector 219. The liquid outlet connector 219 is connected to one end of a second flexible hose 500. In this embodiment, a connecting air pipe 206 is constructed at the upper end of the mixing vessel, and a pressure control valve 207 is installed on the connecting air pipe 206. When the air pressure in the secondary mixing chamber 224 is too high or too low, the air can be released or pressurized through the connecting air pipe 206 to stably supply homogeneous suspension to the grinding and film forming device 400. The specific structure of the powder dispensing component in this embodiment is as follows: the powder dispensing component includes a powder inlet pipe 204 and a cyclone powder outlet 221. The powder inlet pipe 204 extends downward along the axis of the secondary vessel 201 to the upper end of the primary vessel 203. A powder inlet valve 205 is installed on the part of the powder inlet pipe 204 located above the secondary vessel 201. The upper end of the powder inlet pipe 204 is connected to the end of the first flexible hose 300, and the lower end of the powder inlet pipe 204 is fixedly connected to the cyclone powder outlet 221. The cyclone powder outlet 221 has a powder outlet chamber 222, and the powder inlet pipe 204 is connected to the powder outlet chamber 222. In this embodiment, the diameter of the cyclone powder outlet 221 gradually decreases downward in the vertical direction, and multiple cyclone outlets 223 are evenly opened on the peripheral wall of the cyclone powder outlet 221. A first annular pipe 210 is sleeved on the upper part of the primary vessel body 203. Multiple first cyclone pipes 211 are evenly connected to the first annular pipe 210 along its circumference. Each first cyclone pipe 211 is connected to the upper peripheral wall of the primary vessel body 203. A first connector 212 is constructed on the first annular pipe 210, and a first valve body 213 is installed on the first connector 212. The base liquid with a predetermined pressure enters the first annular pipe 210 through the first connector 212, and is then evenly distributed to each of the first vortex pipes 211, so that the base liquid exiting from the first vortex pipes 211 enters the primary mixing chamber 225 in a swirling form. At the same time, the mixture enters the powder outlet chamber 222 of the vortex powder outlet 221 through the powder inlet pipe 204, and then swirls out from each vortex port 223. Moreover, the swirling direction of the mixture is opposite to that of the base liquid, which causes the two to blend together under the action of high shear force, thereby improving the fullness of the mixing.In this embodiment, a mixing shroud 202 is constructed on the upper part of the secondary vessel 201. The mixing shroud 202 gradually narrows in diameter as it rises vertically. A second annular tube 217 is fitted over the mixing shroud 202. Multiple second swirling tubes 218 are uniformly connected to the second annular tube 217 along its circumference. Each second swirling tube 218 is connected to the peripheral wall of the mixing shroud 202, thereby enabling the second swirling tube 218 to connect to the secondary mixing chamber 224. A second connector 216 is constructed on the second annular tube 217. In this embodiment, a discharge pipe 208 is constructed at the lower end of the primary vessel 203. A discharge valve 209 is installed at the lower part of the discharge pipe 208. One end of a bypass pipe 214 is connected to the upper part of the discharge pipe 208, and the other end of the bypass pipe 214 is connected to the second connector 216. A second valve body 215 is installed on the bypass pipe 214. The mixture after mixing in the primary mixing chamber 225 can be directly supplied to the grinding and film forming device 400 through the discharge pipe 208, depending on the mixing situation. Alternatively, the initially mixed mixture can be forced into the second annular pipe 217 through the bypass pipe 214, and then swirled into the secondary mixing chamber 224 through the second vortex pipe 218 to achieve the purpose of secondary mixing, improve the uniformity of mixing, and avoid the sedimentation of the matrix in the base liquid. After the secondary mixing is completed, the mixture is supplied to the grinding and film forming device 400 through the liquid outlet connector 219, thereby ensuring that the grinding and film forming device 400 continuously coats the mixture onto the substrate surface.

[0101] As a preferred embodiment of the present invention, such as Figure 12-15As shown, the grinding film forming apparatus 400 includes a shaft 401, an adapter sleeve 406, a mounting base 409, and a grinding head 414. The adapter sleeve 406 is fixedly mounted on a connecting base 408, which is connected to a robotic arm. The adapter sleeve 406 is connected to one end of the second flexible hose 500. In this embodiment, one end of the shaft 401 passes through the adapter sleeve 406 and is detachably connected to the mounting base 409. The shaft 401 and the adapter sleeve 406 have their axes coincident and are rotatably connected. The grinding head 414 is detachably connected to the end of the mounting base 409 away from the shaft 401. A second transmission wheel 404 is coaxially mounted on the end of the shaft 401 away from the mounting base 409. In this embodiment, a liquid cavity 415 is constructed inside the grinding head 414. Multiple liquid outlet holes 416 are evenly formed along the circumference of the upper peripheral wall of the grinding head 414, each communicating with the liquid cavity 415. A guide channel 405 communicating with the adapter sleeve 406 and the liquid cavity 415 is formed inside the shaft 401. In this embodiment, the inner cavity of the adapter sleeve 406 is an adapter cavity 407. Multiple connecting ports 402 are formed on the shaft 401 located in the adapter cavity 407, connecting the adapter cavity 407 with the guide channel 405. In this embodiment, a connecting flange 403 is constructed at the lower end of the shaft 401, and a joint flange 410 is constructed at the end of the mounting base 409 away from the grinding head 414. The joint flange 410 and the connecting flange 403 are detachably connected together. A flow guide hole 411 is provided on the connector flange 410, and a tapered assembly groove 412 is provided at the center of the end of the mounting base 409 away from the connector flange 410. The two ends of the flow guide hole 411 are connected to the flow guide channel 405 and the tapered assembly groove 412, respectively. A splash guard ring 413 is coaxially constructed on the edge of the mounting base 409. An annular splash guard cavity 417 is formed between the splash guard ring 413 and the corresponding peripheral wall of the grinding head 414. The diameter of the annular splash guard cavity 417 gradually decreases downward in the vertical direction, and an annular flow gap 418 is formed at the lower end of the annular splash guard cavity 417. Each liquid outlet hole 416 is connected to the annular splash guard cavity 417, and the diameter of the liquid outlet hole 416 gradually expands in the direction of flow of homogeneous suspension. This can effectively slow down the flow rate and avoid excessive pressure when the homogeneous suspension enters the annular splash guard cavity 417, which would cause the homogeneous suspension exiting from the flow gap 418 to splash. In this embodiment, a mounting groove 419 is provided at the center of one end of the grinding head 414 near the mounting base 409. A conical valve head 421 is installed in the conical mounting groove 412. A columnar spring 420 is connected to one end of the conical valve head 421 near the grinding head 414. The end of the columnar spring 420 away from the conical valve head 421 is connected to the mounting groove 419. An adjusting rod 422 is movably connected to the conical valve head 421 from the end of the grinding head 414 away from the mounting base 409 via the mounting groove 419 and the columnar spring 420. The adjusting rod 422 is also threadedly connected to the grinding head 414.The working principle and advantages of this embodiment are as follows: By rotating the adjusting rod 422, the depth of the adjusting rod 422 extending into the conical valve head 421 is adjusted, thereby adjusting the gap between the conical valve head 421 and the conical assembly groove 412 under a predetermined pressure. This adjusts the amount of homogeneous suspension entering the annular anti-splash cavity 417. The homogeneous suspension enters the annular anti-splash cavity 417 and is then coated onto the surfaces of the substrate and the grinding head 414 through the flow gap 418. Simultaneously, the second transmission wheel 404 is driven, causing the shaft 401 to rotate, which in turn drives the grinding head 414 to rotate. This allows the substrate to be ground while continuously supplying homogeneous suspension until a self-healing, wear-resistant protective film is formed on the substrate surface. Figure 18 The graph shows the effect of grinding linear speed on film thickness. When the grinding linear speed is relatively fast, the film thickness gradually increases over time. When it increases to a certain extent, that is, after the ceramic-like film (metal self-healing wear-resistant protective film) has been formed, the film thickness will gradually decrease when grinding is performed again. Therefore, the linear speed and grinding time need to be adjusted to a reasonable range. Figure 19 The graph shows the effect of different counterweights on the film thickness of the grinding film forming device 400. When counterweighting the grinding film forming device 400, the counterweight 1 in the graph is generally 2-5 kg, the counterweight 2 is generally 6-7 kg, and the counterweight 3 is generally 8-10 kg. It is not possible to obtain a ceramic-like film with better thickness simply by increasing the counterweight. The counterweight needs to be adjusted within a certain range, generally 7-8 kg. Figure 20 The graph shows the relationship between film thickness and grinding time. As the grinding time increases, the homogeneous suspension reacts with the substrate surface and gradually forms a ceramic-like film. When the thickness of this ceramic-like film reaches a predetermined range, i.e. when film formation is complete, further grinding will cause the thickness of the ceramic-like film to gradually decrease slightly, making it impossible to continue forming a film. Therefore, the grinding time is generally controlled at around 90 minutes. Figure 21 The graph shows the effect of grinding linear speed on roughness. It can be seen that the higher the grinding linear speed, the lower the roughness of the film.

[0102] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A system for preparing a self-healing, wear-resistant protective film for metal, characterized in that: The device includes a mixing grinding unit, a homogenizing suspension preparation unit, and a grinding film forming unit. The outlet of the mixing grinding unit is connected to the powder inlet of the homogenizing suspension preparation unit via a first hose, and the mixing liquid outlet of the homogenizing suspension preparation unit is connected to the inlet of the grinding film forming unit via a second hose. The grinding film forming unit is mounted on a robotic arm, and its lower part is in contact with the surface of the workpiece to be coated. The grinding film forming unit includes a shaft, an adapter sleeve, a mounting base, and a grinding head. The adapter sleeve is fixedly mounted on a connecting base, which is connected to the robotic arm. One end of the adapter sleeve is connected to one end of the second hose. One end of the shaft passes through the adapter sleeve and is detachably connected to the mounting base. The shaft and the adapter sleeve have the same axis and are rotatably connected. The grinding head is detachably connected to the end of the mounting base away from the shaft. A second transmission wheel is coaxially mounted on the end of the shaft away from the mounting base. A liquid cavity is constructed inside the grinding head, and multiple liquid outlet holes are evenly opened along its circumference on the upper peripheral wall of the grinding head. The hole communicates with the liquid cavity, and a flow guide channel communicating with the adapter sleeve and the liquid cavity is provided in the shaft. A joint flange is constructed at the end of the assembly base away from the grinding head, and a flow guide hole is provided on the joint flange. A conical assembly groove is provided at the center of the end of the assembly base away from the joint flange. The two ends of the flow guide hole are respectively connected to the flow guide channel and the conical assembly groove. A splash guard is coaxially constructed at the edge of the assembly base. An annular splash guard cavity is formed between the splash guard and the corresponding peripheral wall of the grinding head. An annular flow gap is formed at the lower end of the annular splash guard cavity. Each liquid outlet hole communicates with the annular splash guard cavity. An installation groove is provided at the center of the end of the grinding head near the assembly base. A conical valve head is installed in the conical assembly groove. A columnar spring is connected to the end of the conical valve head near the grinding head. The end of the columnar spring away from the conical valve head is connected to the installation groove. An adjusting rod is movably connected to the conical valve head from the end of the grinding head away from the assembly base through the installation groove and the columnar spring. The adjusting rod is threadedly connected to the grinding head.

2. The preparation system for a self-healing, wear-resistant protective film for metal according to claim 1, characterized in that: The mixing and grinding device includes a vertically arranged mixing and grinding cylinder. A feed hood with a gradually decreasing diameter along its axis is constructed at the upper end of the mixing and grinding cylinder. An upper end cover is detachably connected to the upper end of the feed hood. Multiple feed oblique flow pipes are uniformly connected to the feed hood along its circumference. A discharge hood with a gradually decreasing diameter along its axis is detachably connected to the lower end of the mixing and grinding cylinder. A mixed powder outlet connector is constructed at the lower end of the discharge hood. A flow-guiding ball mill mechanism is installed in the reactor body formed by the mixing and grinding cylinder, the feed hood, and the discharge hood.

3. The preparation system for a self-healing, wear-resistant protective film for metal according to claim 2, characterized in that: The flow-guiding ball mill mechanism includes a reversible flow-guiding component, a ball milling powder component, and a transmission rod. The reversible flow-guiding component and the ball milling powder component are respectively disposed inside the mixing and crushing cylinder and the discharge hood. The lower end of the transmission rod extends into the mixing and crushing cylinder from the upper end cover along the axis of the mixing and crushing cylinder, and the transmission rod is connected to the reversible flow-guiding component and the ball milling powder component respectively. A first transmission wheel is coaxially mounted on the upper end of the transmission rod.

4. The preparation system for a self-healing, wear-resistant protective film for metal according to claim 3, characterized in that: The variable-direction diversion assembly includes a fixed base coaxially fixedly connected to the transmission rod. A dispersion diversion impeller and a cohesive diversion impeller are sequentially fixed downward along the vertical direction on the fixed base, and the outer edges of the dispersion diversion impeller and the cohesive diversion impeller are rotatably connected to the inner wall of the mixing and crushing cylinder.

5. The preparation system for a self-healing, wear-resistant protective film for metal according to claim 3, characterized in that: The ball mill powder assembly includes a concave feed plate with feed holes distributed throughout it. The lower end of a transmission rod is fixedly connected to the center of the feed plate. A ball milling cylinder is constructed at the lower end of the feed plate, and the lower end of the ball milling cylinder is closed. The upper end of the ball milling cylinder is fixedly connected to the lower surface of the feed plate. Multiple grinding balls are arranged inside the ball milling cylinder. A conical impeller is fixedly fitted around the ball milling cylinder, and the annular gap between the conical impeller and the discharge hood forms a discharge chamber.

6. The preparation system for a self-healing, wear-resistant protective film for metal according to claim 1, characterized in that: The homogenized suspension preparation device includes a vertically arranged mixing tank, which includes a primary tank and a secondary tank arranged sequentially upwards in the vertical direction. The primary tank and the secondary tank are separated by a powder dispensing component. The primary tank is connected to the secondary tank via a bypass pipe. A liquid outlet connector is constructed at the lower part of the secondary tank, and the liquid outlet connector is connected to one end of a second flexible hose.

7. The preparation system for a self-healing, wear-resistant protective film for metal according to claim 6, characterized in that: The powder dispensing assembly includes a powder inlet pipe extending downwards along the axis of the secondary vessel to the upper end of the primary vessel. The upper end of the powder inlet pipe is connected to the end of a first flexible tube, and the lower end of the powder inlet pipe is equipped with a vortex powder outlet. The diameter of the vortex powder outlet gradually narrows downwards in the vertical direction, and multiple vortex orifices are evenly formed on the peripheral wall of the vortex powder outlet. A first annular tube is sleeved on the upper part of the primary vessel, and multiple first vortex tubes are evenly connected to the first annular tube along its circumference. Each first vortex tube is connected to the primary vessel. The upper peripheral wall of the primary vessel is connected, and a first connector is constructed on the first annular tube; a mixing shroud with a gradually decreasing diameter along the vertical direction is constructed on the upper part of the secondary vessel, and a second annular tube is provided on the outer sleeve of the mixing shroud. Multiple second swirling tubes are uniformly connected along the circumference of the second annular tube, and each second swirling tube is connected to the peripheral wall of the mixing shroud. A second connector is constructed on the second annular tube; a discharge pipe is constructed at the lower end of the primary vessel, one end of the bypass pipe is connected to the discharge pipe, and the other end of the bypass pipe is connected to the second connector.

8. A method for preparing a self-healing wear-resistant protective film using the preparation system of any one of claims 1-7, characterized in that, Includes the following steps: S1. Simultaneously supply multiple coarse powders with different components and proportions to the mixing grinding device; S2. Simultaneously start the mixing and grinding device, where these coarse powders are gradually finely ground and mixed. S3. Control the pressure inside the mixing grinding device according to the output of the mixing grinding device and the pressure inside the homogeneous suspension equipment. S4. Inject the base liquid with a predetermined pressure into the homogenized suspension preparation device, so that the base liquid and the mixed fine powder entering the homogenized suspension preparation device are fully mixed to form a homogenized suspension. S5. The obtained homogeneous suspension enters the grinding and film-forming device and is continuously supplied to the surface of the workpiece to be film-forming. S6. Control the actions of the grinding film forming device and the robot arm so that the grinding film forming device grinds the surface of the workpiece coated with homogeneous suspension until a layer of metal self-healing wear-resistant protective film is formed on the surface of the workpiece.

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