Crushing process and equipment for PTFE micro powder for coating

Abstract

The invention relates to the technical field of physical crushing of materials, in particular to a process and equipment for crushing PTFE (Polytetrafluoroethylene) micro powder for a coating. The pre-treatment assembly is used for pre-treating PTFE raw materials, including drying, primary crushing and impurity removal, the mechanical grinding assembly is used for grinding the PTFE raw materials until the particle size requirement of the PTFE micro powder for the coating is met, and the physical crushing assembly is used for assisting the mechanical grinding assembly in crushing the PTFE raw materials. The grading and screening assembly is used for separating the crushed and ground PTFE micro powder according to the particle size, and the collecting and packaging assembly is used for sealing and packaging the graded PTFE micro powder. The low-temperature smashing and circulating process remarkably reduces energy consumption, meanwhile, raw material loss is reduced, the closed system design gives consideration to production efficiency and operation safety, graded packaging supports customized product output, and the requirements of diversified scenes from high-precision electronic coatings to industrial anti-corrosion coatings and the like are met.

Description

Technical Field

[0001] The present invention relates to the technical field of physical crushing of materials, and particularly to a crushing process and equipment for PTFE micro-powder used in coatings. Background Art

[0002] PTFE (polytetrafluoroethylene) is a polymer material with excellent chemical stability and high heat resistance, and is widely used in many fields such as coatings, electronics, electrical engineering, and chemical engineering. As an additive in coatings, PTFE micro-powder can significantly improve the performance of coatings. For example, it can improve the wear resistance, high temperature resistance, and corrosion resistance of coatings. At the same time, PTFE micro-powder has good fluidity, lubricity, and anti-sticking properties, so it is often used as a filler or additive in coatings. The particle size distribution of PTFE micro-powder used in coatings is crucial for the performance of coatings. Over-large particles will affect the uniformity and adhesion of coatings, while over-small particles may reduce their wear resistance and high temperature resistance. Therefore, the crushing process for producing PTFE micro-powder used in coatings needs to precisely control the particle size and maintain a high purity.

[0003] Existing crushing equipment such as jaw crushers and ball mills have low crushing efficiency when processing harder PTFE, especially in the fine crushing stage, which may require a long processing time, resulting in reduced production efficiency. During the crushing process, the equipment's particle size control ability is limited, which may lead to uneven particle size distribution of the micro-powder and unable to precisely control the required particle size range in the coating, affecting the final performance of the coating. Summary of the Invention

[0004] In order to solve the problem of low crushing efficiency of PTFE micro-powder and improve the screening control of PTFE micro-powder, the present invention provides a crushing process and equipment for PTFE micro-powder used in coatings.

[0005] On the one hand, a crushing process for PTFE micro-powder used in coatings provided by the present invention adopts the following technical scheme:

[0006] A crushing process for PTFE micro-powder used in coatings includes the following crushing steps:

[0007] Dry and preliminarily crush the PTFE raw material;

[0008] Screen and remove metal impurities and inorganic caking impurities in the PTFE raw material;

[0009] Successively carry out crushing and grinding on the dried and preliminarily crushed PTFE raw material;

[0010] Freeze and irradiate the PTFE raw material and carry out the cycle of crushing and grinding multiple times, and finally crush the PTFE raw material into PTFE micro-powder;

[0011] The PTFE fine powder is sieved, and finally qualified PTFE fine powder is selected;

[0012] The qualified PTFE fine powder is classified;

[0013] The classified PTFE fine powder is separately packaged according to different particle sizes.

[0014] By removing the moisture in the raw materials and pre-crushing, the stability of the subsequent crushing process is significantly improved, avoiding particle adhesion and energy loss caused by humidity. Physical screening means are used to efficiently remove metal and inorganic impurities, ensuring the chemical purity of the final product and avoiding the negative impact of impurities on the film-forming property and mechanical properties of the coating. The PTFE material is embrittled in an extremely low-temperature environment, combined with irradiation to initiate controllable chain scission of molecules, significantly reducing the crushing energy consumption. At the same time, it breaks through the limitation of the fineness of fine powder by traditional mechanical crushing. Through multiple cycles of freezing-irradiation-crushing, progressive refinement of particles is achieved, effectively controlling the particle size distribution range and avoiding particle agglomeration problems caused by over-crushing. Combining mechanical screening and air classification, different particle sizes of fine powder are accurately separated to meet the differentiated requirements for properties such as leveling and abrasion resistance in the coating system. The product specifications are adjusted in real time through multi-stage screening to ensure the consistency of particle size between batches, providing a stable raw material basis for the coating formulation design.

[0015] On the other hand, a crushing device for PTFE fine powder for coatings provided by the present invention adopts the following technical solutions:

[0016] A crushing device for PTFE fine powder for coatings, comprising:

[0017] A pretreatment component for pretreating the PTFE raw material, including drying, preliminary crushing, and impurity removal;

[0018] A mechanical grinding component, which is connected to the pretreatment component through a conveying device and is used for grinding the PTFE raw material to meet the particle size requirements of PTFE fine powder for coatings;

[0019] A physical crushing component, which is connected to the mechanical grinding component or the pretreatment component through a conveying device and is used to assist the mechanical grinding component in crushing the PTFE raw material;

[0020] A classification and screening component, which is connected to the physical crushing component through a conveying device and is used to separate the crushed and ground PTFE fine powder according to particle size;

[0021] A collection and packaging component, which is connected to the classification and screening component through a conveying device and is used to separately seal and package the classified PTFE fine powder.

[0022] Remove the moisture of the raw materials by means of heat conduction or air flow circulation to avoid the problem of material adhesion caused by humidity during the subsequent crushing process. Pre-crush the massive PTFE raw materials into millimeter-sized particles through a shearing or impact crushing mechanism to provide a uniform material basis for fine crushing. Configure a magnetic separation device and a vibrating screen to separate metal impurities and inorganic residues, ensuring that the chemical purity of the raw materials meets the requirements of coating production. Adopt a high-hardness grinding disc or roll pressing structure to grind the PTFE particles to the micron level by mechanical force, control the particle size distribution range. As an auxiliary system, further refine the particles after mechanical grinding through air flow impact or cryogenic embrittlement technology to break through the limitation of the toughness of PTFE materials on the crushing fineness. Combine vibrating screens with different mesh numbers to conduct three-stage separation of coarse, medium, and fine on the crushed products, remove oversized particles that do not meet the standards and over-crushed ultra-fine powders. Use the principles of centrifugal force field and aerodynamics to precisely classify the micron-sized particles to ensure the concentration of fine powders in each particle size range. The unqualified materials re-enter the crushing process through the return pipeline to form a continuous cyclic processing system. The two crushing systems adopt a phased working mode, switch the main crushing and auxiliary crushing processes according to the material state, and reduce the ineffective energy consumption.

[0023] Furthermore, the pretreatment component includes a drying treatment member, a preliminary crushing member, and a impurity removal member. The drying treatment member, the preliminary crushing member, and the impurity removal member are sequentially connected by a conveying device. The drying treatment member is used to remove the moisture in the PTFE raw materials. The preliminary crushing member is used to preliminarily crush the PTFE raw materials after moisture removal. The impurity removal member is used to remove impurities from the preliminarily crushed PTFE raw materials, including metal and inorganic lumps.

[0024] The drying, crushing, and impurity removal processes operate independently to prevent the mutual interference between moisture evaporation and the heat generated by mechanical crushing, ensure the stable treatment effect of each link, form a uniform particle distribution of the materials after preliminary crushing, and provide raw materials with suitable sizes for the subsequent crushing process. Through the synergistic effect of temperature regulation and air flow circulation, effectively reduce the moisture content of the raw materials, prevent equipment blockage and increased energy consumption caused by material adhesion during the subsequent crushing process. Use magnetic separation technology to remove iron-based metal residues and protect the subsequent crushing components from wear by hard particles. Achieve the separation of non-metallic impurities based on the density difference of the materials to ensure that the chemical purity of the raw materials meets the requirements of micro-powder production.

[0025] Further, the drying treatment member includes a heating box, an exhaust pipe, and a humidity sensor. A heating element is provided inside the heating box. The exhaust pipe is connected to the inside of the heating box and is externally connected to an air extraction device. The humidity sensor is installed inside the heating box. The preliminary crushing member includes a pushing rod, a shearing cutter, and a stirring comb. The pushing rod is telescopically installed in the straight groove of the preliminary crushing member. The shearing cutter is movably installed inside the straight groove of the preliminary crushing member. The pushing rod is installed on one side of the shearing cutter and telescopically moves towards the shearing cutter. The stirring comb is rotatably installed on the other side of the shearing cutter. The impurity removal member includes a magnetic separation roller, a blower, and a collection tank. The magnetic separation roller is horizontally rotatably installed and connected to the end of the preliminary crushing member. The blower is installed on one side below the magnetic separation roller and blows air towards directly below the magnetic separation roller. The collection tank is installed at the position below the magnetic separation roller and receives the materials falling from the magnetic separation roller.

[0026] The heating element provides a controllable heat source, and together with the air extraction device, forms a directional air flow cycle, accelerating the evaporation and discharge of moisture from the box body, avoiding problems of local over-wetting or overheating caused by uneven air flow distribution in traditional drying. The humidity sensor real-time monitors the environmental parameters inside the box, dynamically adjusts the heating power and air extraction rate, ensuring that the drying degree of the material meets the requirements of the subsequent crushing process. The enclosed drying environment and continuous conveying structure prevent the dried material from re-absorbing environmental moisture during transportation. The reciprocating movement of the pushing rod continuously presses the raw material into the working area of the shearing cutter, realizing the sequential crushing of batch materials and avoiding equipment jamming caused by excessive feeding at one time. The coordinated action of the shearing cutter and the pushing rod forms a controllable shearing strength, which can not only effectively crush large raw materials but also prevent powder flying loss caused by excessive pulverization. The rotational movement of the stirring comb breaks the electrostatic adsorption and mechanical entanglement of the crushed materials, ensuring smooth discharging and promoting the uniform dispersion of the crushed particles. The rotating magnetic separation roller automatically adsorbs ferromagnetic impurities during the transportation of materials and realizes automatic collection of impurities through separation in the non-magnetic area, forming an uninterrupted impurity removal operation. The blower applies a directional air flow in the later stage after magnetic separation, and uses the aerodynamic property differences between impurities and PTFE particles to further separate the remaining non-metallic inorganic substances. The inclination design and surface treatment process of the collection tank ensure that the sorted pure PTFE particles slide down without retention and prevent impurities from mixing into the downstream process.

[0027] Further, the mechanical grinding and powdering assembly includes a crushing member and a ball milling member. The crushing member and the ball milling member are sequentially connected by a conveying device, and the crushing member and the ball milling member sequentially crush the PTFE raw material in stages.

[0028] The crushing component coarsely crushes the raw materials and pre-processes the large pieces of material into a particle size range suitable for the ball mill feed requirements, avoiding ineffective collision of grinding media and energy waste caused by direct ball milling. After coarse crushing, the material forms a uniform intermediate particle size distribution, providing size-optimized input for the ball milling process, ensuring the grinding efficiency and the consistency of the final micro-powder particle size. The process combination of high-intensity impact crushing and low-speed grinding significantly reduces the overall energy consumption and improves energy utilization.

[0029] Furthermore, the crushing component includes a spiral crushing knife, a screen, a cleaning brush and a screw conveyor. The spiral crushing knife is a double group and meshes with each other. The spiral crushing knife is rotatably installed in the cavity of the crushing component. The screen is installed at the bottom opening of the cavity of the crushing component. The cleaning brush is movably installed on the screen. The conveying start end of the screw conveyor is installed and connected to the cleaning and collection end of the cleaning brush. The conveying end of the screw conveyor is installed and connected above the spiral crushing knife. The ball mill component includes a rotating shell, grinding balls, a discharging net and a discharging vibration motor. The grinding balls are placed in the rotating shell and are driven to collide with each other by the rotation of the rotating shell. The discharging net is installed at the discharging port of the rotating shell, and the discharging vibration motor is installed and connected to the discharging net.

[0030] Two sets of counter-rotating spiral crushing knives form a continuous shear-extrusion composite force field through meshing tooth surfaces, achieving progressive deconstruction of PTFE block materials, improving coarse crushing efficiency and reducing the risk of abnormal tool wear compared to single-axis crushing. The bottom screen is linked with the rotating cleaning brush to separate qualified particles in real time during the crushing process. At the same time, the cleaning brush removes blockages in the screen holes to ensure continuous material flow capacity. Substandard materials are directed back to the top of the crushing chamber via a screw conveyor, forming a closed-loop re-crushing process, avoiding manual intervention and improving raw material utilization. The rotating shell drives the grinding balls to form a high-density collision network in a composite motion mode, accelerating the micronization process. The discharging net and the vibration motor work together to eliminate the phenomenon of powder hanging on the wall through high-frequency micro-vibration, while accelerating qualified micro-powders to pass through the screen holes to avoid fine powder agglomeration caused by over-grinding.

[0031] Further, the physical pulverization component includes a cryogenic treatment member and an irradiation treatment member. The cryogenic treatment member is respectively connected to the pretreatment component and the mechanical milling component through a conveying member. The cryogenic treatment member is used for the cryogenic treatment of PTFE raw materials. The irradiation treatment member is respectively connected to the pretreatment component and the mechanical milling component through a conveying member. The irradiation treatment member is used for the irradiation treatment of PTFE raw materials. The cryogenic treatment member includes a heat preservation shell, a heat preservation inner liner, a feeding port and a mixing comb. The heat preservation shell is wrapped outside the heat preservation inner liner. The feeding port passes through the heat preservation shell and communicates with the heat preservation inner liner. The feeding port is externally connected to a refrigerant conveying device. A mixing comb is rotatably arranged in the heat preservation inner liner. The irradiation treatment member includes a protection shell and an irradiation emitter. The irradiation emitter is installed in the protection shell and emits irradiation light towards the inner cavity of the protection shell.

[0032] The rotating mixing comb continuously stirs the material in the heat preservation inner liner to ensure the full heat exchange between the refrigerant and the PTFE raw material, eliminate the uneven freezing phenomenon caused by abnormal local temperature difference, and through precise control of the freezing temperature, make the PTFE glass transition interval best match the subsequent mechanical pulverization process, improve the crushing efficiency and reduce the fine powder agglomeration caused by plastic deformation. The spatial arrangement design of the irradiation emitter ensures that the PTFE raw material receives homogeneous irradiation from multiple angles during the conveying process, causing partial chain scission of the molecular chain without affecting the overall chemical stability. The pre-irradiation treatment reduces the material toughness, forms a process synergy with the subsequent mechanical pulverization, reduces the energy requirement of the grinding ball impact while increasing the micro-powder yield.

[0033] Further, the classification and screening component includes a vibration screening member, a turbo classification member and an electrostatic elimination member. The vibration screening member and the turbo classification member are sequentially connected through a conveying device. The electrostatic elimination member is respectively connected to the vibration screening member and the turbo classification member. The electrostatic elimination member is used to eliminate the static electricity of PTFE micro-powder.

[0034] The vibration screening member realizes three-dimensional screening movement through mechanical vibration, improves the screening efficiency while avoiding sieve hole blockage, and ensures the preliminary particle size classification effect of PTFE micro-powder. The vibration intensity of the vibration screening member can be automatically adjusted according to the material flow rate to ensure the stability and continuity of the screening process and avoid the efficiency decline caused by material accumulation. The turbo classification member uses the centrifugal force field generated by the rotating turbine to perform more precise particle size classification on the micro-powder, improves the sorting accuracy, meets the strict requirements of high-end applications for the powder particle size, and realizes flexible control of the classification particle size by adjusting the turbine speed or air flow parameters to adapt to different process requirements. The electrostatic elimination member is respectively connected to the vibration screening and turbo classification members, continuously eliminates the static electricity of PTFE micro-powder during the whole screening process, avoids powder agglomeration or adsorption on the equipment surface, ensures the powder fluidity and screening efficiency, and effectively reduces the residue of the powder during the conveying and classification processes, improving the sorting accuracy and the stability of the system operation.

[0035] Furthermore, the vibration screening component includes a screening tower, a screening vibration motor, and a shock absorber seat. A plurality of screening meshes are vertically and spacedly arranged in the screening tower, and the specifications of the screening meshes decrease sequentially from top to bottom. The screening vibration motor is installed and connected to the screening tower. The shock absorber seat is installed at the bottom of the screening tower to block the vibration of the screening tower from being transmitted to the ground or other equipment. The turbine classification component includes a first classification turbine, a second classification turbine, and a third classification turbine. The first classification turbine, the second classification turbine, and the third classification turbine are sequentially connected through a conveying device. The classification accuracies of the first classification turbine, the second classification turbine, and the third classification turbine increase sequentially. The static electricity elimination component includes ionization rods, an antistatic agent input pipe, and a protective gas input pipe. The ionization rods are installed inside the screening tower, the first classification turbine, the second classification turbine, and the third classification turbine. The antistatic agent input pipe is respectively communicated with the screening tower, the first classification turbine, the second classification turbine, and the third classification turbine and is externally connected to an antistatic agent supply device. The protective gas input pipe is respectively communicated with the screening tower, the first classification turbine, the second classification turbine, and the third classification turbine and is externally connected to a protective gas supply device.

[0036] A plurality of screening meshes are vertically arranged in the screening tower, and the specifications of the screening meshes decrease sequentially from top to bottom, realizing the gradient classification of PTFE micro-powder, ensuring the efficient separation of powders in different particle size ranges. The screening vibration motor provides a stable vibration source, ensuring the efficient vibration of the screening mesh, avoiding material blockage, and improving the screening efficiency. The shock absorber seat effectively blocks the vibration of the screening tower from being transmitted to the ground or other equipment, reducing the interference to surrounding equipment, and at the same time enhancing the stability of the screening process. The first classification turbine, the second classification turbine, and the third classification turbine are sequentially connected, and the classification accuracy increases step by step, realizing the multi-stage separation of PTFE micro-powder from coarse separation to fine separation. Each stage of turbine classifier adopts different turbine parameters, gradually improving the separation accuracy, meeting the stringent requirements for the particle size of powders in high-end applications. Connected through a conveying device, a continuous classification process is formed, reducing the residence time of powders in the classification process, and improving the production efficiency. The ionization rods efficiently neutralize static electricity: The ionization rods are installed inside the screening tower and each classification turbine, continuously releasing ions to neutralize the static electricity on the surface of the powders, avoiding powder agglomeration or adsorption on the surface of the equipment, and ensuring the fluidity and separation accuracy of the powders. The antistatic agent input pipe uniformly injects the antistatic agent into the screening tower and the classification turbine, further reducing the surface charge density of the powders and enhancing the static electricity elimination effect. The protective gas input pipe provides inert gas to prevent the PTFE micro-powder from being oxidized or degraded due to contact with air during the separation process, ensuring the powder quality.

[0037] Further, the collection and packaging assembly includes a blast collection component and a vacuum packaging component. The blast collection component and the vacuum packaging component are sequentially connected by a conveying device. The blast direction of the blast collection component is towards the vacuum packaging component. The blast collection component includes a blower, a collection cloth bag, and a closing valve. The blower and the collection cloth bag are installed and connected at the discharge end of the grading and screening assembly. The blower blows air towards the collection cloth bag. The closing valve is installed at the installation position of the collection cloth bag. The vacuum packaging component includes a drying oven, a bagging machine, and a vacuum machine. The drying oven is connected to the bagging machine by a conveying device, and the vacuum machine is installed inside the bagging machine.

[0038] The blower blows air towards the collection cloth bag, quickly transporting the PTFE fine powder at the discharge end of the grading and screening assembly into the collection cloth bag, avoiding the retention of the powder during transportation due to electrostatic or gravitational forces. The collection cloth bag uses a high-density filtering material to ensure efficient interception of the PTFE fine powder while allowing air flow through, preventing powder leakage or environmental pollution. The closing valve is installed at the installation position of the collection cloth bag and can be quickly closed after collection to prevent powder leakage or entry of external impurities, ensuring the tightness and cleanliness of the collection process. The drying oven is connected to the bagging machine by a conveying device, drying the collected PTFE fine powder to remove residual moisture or volatile substances on the powder surface, ensuring stable powder quality. The bagging machine uses automated packaging technology to fill the dried PTFE fine powder into packaging bags according to a preset weight or volume, improving packaging efficiency and reducing errors caused by manual operation. The vacuum machine is installed inside the bagging machine, performing vacuum pumping on the packaging bag to remove the air inside the bag, preventing the oxidation or moisture absorption of the PTFE fine powder during storage and extending the shelf life of the powder.

[0039] In summary, the present invention has the following beneficial technical effects:

[0040] 1. The obtained fine powder has a higher specific surface area and surface activity, showing excellent dispersibility and interfacial bonding force in coatings, which can enhance the core functions such as corrosion resistance and self-cleaning of the coating. The low-temperature grinding and recycling process significantly reduces energy consumption and raw material loss at the same time. The closed-system design takes into account both production efficiency and operation safety. The grading and packaging support customized product output, adapting to the diverse scenario requirements from high-precision electronic coatings to industrial anti-corrosion coatings.

[0041] 2. By connecting each component through a closed conveying pipeline, continuous production of the entire process from raw material pretreatment - grinding - grading - packaging is realized. The complementary effect of mechanical grinding and physical pulverization combined with multi-stage sorting can stably output PTFE fine powder within the applicable range. Negative pressure dust collection devices are set in the grinding and conveying links, used in combination with anti-static materials, effectively suppressing the risk of combustible dust diffusion. By adjusting the grinding disc gap, sieve mesh size, and air separation parameters, the processing requirements of PTFE raw materials with different crystallinities can be adapted.

[0042] 3. The pre-removal function significantly reduces the probability of metal hard particles entering the crushing system, extends the service life of the core crushing components, reduces energy loss during the crushing of the dried low-moisture content materials, and at the same time, the uniform particle size distribution improves the subsequent crushing efficiency. The effective control of the raw material purity ensures the chemical stability and particle size consistency of the final PTFE fine powder, meeting the requirements of high-end application scenarios for material properties. Pressure release and emergency discharge channels are set between modules to prevent the risk of system failures caused by material blockage.

[0043] 4. Each component realizes seamless connection of the drying-crushing-removal processes through the conveying device, reduces the material temporary storage link, and reduces the risk of cross-contamination. The modular design allows for individual maintenance or replacement of specific functional units, minimizes the downtime and improves the flexibility of the production line. Moisture control, coarse particle size adjustment, and impurity separation are completed in the pretreatment stage, significantly reducing the adjustment complexity and abnormal occurrence rate of the subsequent fine powder preparation process.

[0044] 5. The conveying device integrates functions of material flow monitoring and speed matching to ensure the material supply balance between processes, improve the system stability. The phased design isolates the high-wear components from the precision grinding system, reduces the maintenance complexity and extends the service life of the equipment. The two-stage crushing process significantly reduces the dispersion degree of the particle size distribution, ensuring that the final product has high homogeneity.

[0045] 6. The air flow generated by the vibrating screening component is rectified and used as the auxiliary air flow for turbine classification, reducing the total air consumption of the system. The sequential coordination of static electricity elimination and mechanical vibration continuously breaks the van der Waals force during the powder conveying process, maintaining the single-particle dispersion state. Quick-release sealing covers are set at the joints of each component to support in-situ pulse backwashing cleaning and eliminate cross-contamination caused by powder accumulation in dead zones.

[0046] 7. The vibrating screening component and the three-stage turbine classification component work together to achieve an efficient sorting process from coarse screening to fine separation, significantly improving the overall screening efficiency and the accuracy of the particle size distribution. The static electricity elimination component runs through the whole process of screening and classification to ensure that the powder maintains good dispersion and fluidity at each stage of sorting, avoiding powder agglomeration or equipment contamination caused by static electricity. Each component is connected by a standardized conveying device, facilitating modular maintenance and process adjustment to adapt to the production requirements of multiple varieties and batches.

[0047] 8. The air-blowing collection component and the vacuum packaging component are seamlessly connected through the conveying device to form a continuous process from collection to packaging, significantly improving the production efficiency. The coordinated design of air-blowing collection and vacuum packaging effectively reduces the loss of PTFE fine powder during collection and packaging, ensuring high utilization rate of the powder. The entire collection and packaging process is carried out in a closed environment, avoiding powder leakage or external impurity contamination. Description of the Drawings

[0048] Figure 1 Schematic diagram of the installation, layout and connection structure of each component of the present invention;

[0049] Figure 2 is Figure 1 Another perspective schematic diagram;

[0050] Figure 3 is Figure 1 Full-section structure schematic diagram at the central plane.

[0051] Explanation of reference numerals:

[0052] 1. Pretreatment component, 11. Drying treatment member, 111. Heating box, 112. Exhaust pipe, 113. Humidity sensor, 12. Preliminary crushing member, 121. Pushing rod, 122. Shearing cutter, 123. Stirring comb, 13. Impurity removal member, 131. Magnetic separation roller, 132. Blower, 133. Collection tank;

[0053] 2. Mechanical grinding component, 21. Crushing member, 211. Spiral crushing knife, 212. Screen, 213. Cleaning brush, 214. Screw conveyor, 22. Ball milling member, 221. Rotating shell, 222. Grinding balls, 223. Discharge screen, 224. Discharge vibration motor;

[0054] 3. Physical pulverization component, 31. Low-temperature treatment member, 311. Heat preservation shell, 312. Heat preservation inner liner, 313. Feeding port, 314. Mixing comb, 32. Irradiation treatment member, 321. Protection shell, 322. Irradiation emitter;

[0055] 4. Classification and screening component, 41. Vibration screening member, 411. Screening tower, 412. Screening vibration motor, 413. Shock absorber, 42. Turbine classification member, 421. First classification turbine, 422. Second classification turbine, 423. Third classification turbine, 43. Electrostatic elimination member, 431. Ionization rod, 432. Antistatic agent input pipe, 433. Protection gas input pipe;

[0056] 5. Collection and packaging component, 51. Blowing collection part, 511. Blower, 512. Collection cloth bag, 513. Closing valve, 52. Vacuum packaging part, 521. Drying box, 522. Packing machine, 523. Vacuum machine. Detailed implementation manners

[0057] Next, it will be combined with the attached Figures 1 - 3, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0058] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0059] Embodiment 1:

[0060] The present invention discloses a pulverization process for PTFE micro-powder for coatings, including the following pulverization steps:

[0061] Dry and preliminarily crush the PTFE raw material;

[0062] Screen and remove metal impurities and inorganic caking impurities in the PTFE raw material;

[0063] Successively perform crushing and grinding on the dried and preliminarily crushed PTFE raw material;

[0064] Freeze and irradiate the PTFE raw material and perform the crushing and grinding cycle multiple times. Finally, crush the PTFE raw material into PTFE micro-powder;

[0065] Perform screening on the PTFE micro-powder, and finally screen out qualified PTFE micro-powder;

[0066] Perform classification on the qualified PTFE micro-powder;

[0067] Pack the classified PTFE micro-powder separately according to different particle sizes.

[0068] Place the PTFE raw material in a drying oven and dry it at a temperature of 80°C - 100°C for 1 - 2 hours to ensure that the moisture content of the material is less than 0.05%.

[0069] Use a shear crusher to preliminarily crush the dried PTFE raw material, and control the particle size of the crushed material within 1 cm - 5 cm.

[0070] Put the screened PTFE material into a crusher for secondary crushing, and control the particle size after crushing to be 100μm - 500μm.

[0071] Use a ball mill to grind the crushed material, control the grinding time to be 1 - 3h, and finally reach a particle size of 10 - 50μm.

[0072] Place the PTFE material in a freezer and freeze it at a temperature of -80°C to -100°C for 1 to 2 hours to make the material brittle, or use an electron beam irradiation device to irradiate the frozen PTFE material, with an irradiation dose of 10 to 50kGy, to improve the crushing efficiency of the material.

[0073] Crush and grind the material after freezing and irradiation treatment again, with the number of cycles being 3 to 5 times until the particle size of the material reaches 1μm - 10μm.

[0074] The classification particle size ranges from 1 to 5μm, 5 to 10μm and other different specifications.

[0075] Example 2:

[0076] The embodiment of the present invention discloses a crushing device for PTFE micro powder for coatings. Refer to Figure 1 , including:

[0077] A pretreatment component 1, used for pretreating the PTFE raw material, including drying, preliminary crushing and impurity removal;

[0078] A mechanical grinding component 2, the mechanical grinding component 2 is connected to the pretreatment component 1 through a conveying device, and is used for grinding the PTFE raw material and meeting the particle size requirements of the PTFE micro powder for coatings;

[0079] A physical crushing component 3, the physical crushing component 3 is connected to the mechanical grinding component 2 or the pretreatment component 1 through a conveying device, and is used to assist the mechanical grinding component 2 to crush the PTFE raw material;

[0080] A classification and screening component 4, the classification and screening component 4 is connected to the physical crushing component 3 through a conveying device, and is used to separate the crushed and ground PTFE micro powder according to the particle size;

[0081] A collection and packaging component 5, the collection and packaging component 5 is connected to the classification and screening component 4 through a conveying device, and is used to seal and package the classified PTFE micro powder respectively.

[0082] Place the PTFE raw material in a drying oven and dry it at a temperature of 80°C to 100°C for 1 to 2 hours to ensure that the moisture content of the material is less than 0.05%. Use a shear crusher to preliminarily crush the dried PTFE raw material, and control the particle size of the crushed material within 1 - 5 cm.

[0083] Use a magnetic separation device to remove metal impurities, and convey the pretreated PTFE material to the mechanical milling assembly 2 through a conveying device. Feed the pretreated PTFE material into the mechanical milling assembly 2 for milling treatment, and control the milling time within 1 to 3 hours to make the particle size of the material reach 10μm - 50μm.

[0084] Convey the milled PTFE fine powder to the physical pulverization assembly 3 through a conveying device. Place the PTFE material in a freezer and freeze it at a temperature of -80°C to -100°C for 1 to 2 hours to make the material brittle. Use an electron beam irradiation device to irradiate the frozen PTFE material, with an irradiation dose of 10 - 50 kGy to improve the pulverization efficiency of the material. Re - conduct mechanical milling treatment on the frozen and irradiated material for 3 - 5 cycles until the particle size of the material reaches 1μm - 10μm.

[0085] Convey the treated PTFE fine powder to the classification and screening assembly 4 through a conveying device, and use the classification and screening assembly 4 to classify and screen the PTFE fine powder.

[0086] Convey the classified PTFE fine powder to the collection and packaging assembly 5 through a conveying device. Collect the classified PTFE fine powder into anti - static PE bags or aluminum foil bags respectively, and conduct sealed packaging according to different particle size specifications. The weight of each bag is 1 kg or 5 kg, ensuring that the packaging is leak - free and moisture - proof. Store the packaged PTFE fine powder in a dry and cool warehouse, avoiding direct sunlight and high temperature.

[0087] Example 3:

[0088] Based on Example 2, add:

[0089] Refer to Figure 1 , the pretreatment assembly 1 includes a drying treatment component 11, a preliminary crushing component 12, and an impurity removal component 13. The drying treatment component 11, the preliminary crushing component 12, and the impurity removal component 13 are sequentially connected through a conveying device. The drying treatment component 11 is used to remove moisture from the PTFE raw material, the preliminary crushing component 12 is used to preliminarily crush the PTFE raw material after moisture removal, and the impurity removal component 13 is used to remove impurities from the preliminarily crushed PTFE raw material, including metals and inorganic lumps.

[0090] Refer to Figure 2 and Figure 3, the drying component 11 includes a heating box 111, an exhaust pipe 112, and a humidity sensor 113. A heating element is provided inside the heating box 111. The exhaust pipe 112 is connected to the inside of the heating box 111 and is externally connected to an exhaust device. The humidity sensor 113 is installed inside the heating box 111;

[0091] The preliminary crushing component 12 includes a pushing rod 121, a shearing cutter 122, and a stirring comb 123. The pushing rod 121 is telescopically installed in the straight groove of the preliminary crushing component 12. The shearing cutter 122 is movably installed inside the straight groove of the preliminary crushing component 12. The pushing rod 121 is installed on one side of the shearing cutter 122 and telescopically moves towards the shearing cutter 122. The stirring comb 123 is rotatably installed on the other side of the shearing cutter 122;

[0092] The impurity removal component 13 includes a magnetic separation roller 131, a blower 132, and a collection tank 133. The magnetic separation roller 131 is horizontally rotatably installed and connected to the end of the preliminary crushing component 12. The blower 132 is installed on one side below the magnetic separation roller 131 and blows air towards directly below the magnetic separation roller 131. The collection tank 133 is installed at the position below the magnetic separation roller 131 and receives the materials falling from the magnetic separation roller 131.

[0093] Put the PTFE raw material into the heating box 111, start the heating element, control the temperature inside the box at 80°C to 100°C, connect an external exhaust device through the exhaust pipe 112, continuously extract the moisture inside the box, accelerate the drying process, and the humidity sensor 113 monitors the humidity inside the box in real time. When the humidity is lower than 0.05%, the drying is completed. The dried PTFE raw material is transported to the preliminary crushing component 12 through a conveying device (such as a screw conveyor).

[0094] The pushing rod 121 pushes the dried PTFE raw material from one side to the position of the shearing cutter 122. The shearing cutter 122 shears and crushes the material, and the particle size after crushing is controlled within 1 to 5 cm. The stirring comb 123 rotates to stir the sheared material to prevent the material from piling up and ensure uniform crushing. The preliminarily crushed PTFE material is transported to the impurity removal component 13 through a conveying device.

[0095] The magnetic separation roller 131 rotates horizontally, adsorbs the metal impurities in the material and falls into the collection tank 133 behind the magnetic separation roller 131. The blower 132 blows the light PTFE raw material in the material away from the magnetic separation roller 131 and into the collection tank 133 at the farthest distance. The collection tank 133 directly below the magnetic separation roller 131 receives the inorganic lumps falling from the magnetic separation roller 131. The PTFE material after impurity removal is transported to the mechanical grinding assembly 2 through a conveying device.

[0096] Example 4:

[0097] Based on Example 2, add:

[0098] Refer to Figure 1 , the mechanical grinding component 2 includes a crushing member 21 and a ball milling member 22. The crushing member 21 and the ball milling member 22 are sequentially connected by a conveying device, and the crushing member 21 and the ball milling member 22 sequentially pulverize the PTFE raw material in stages.

[0099] Refer to Figure 2 and Figure 3 , the crushing member 21 includes a spiral crushing knife 211, a screen 212, a cleaning brush 213 and a spiral conveyor 214. The spiral crushing knives 211 are in a double group and mesh with each other. The spiral crushing knives 211 are rotatably installed in the cavity of the crushing member 21. The screen 212 is installed at the bottom opening of the cavity of the crushing member 21. The cleaning brush 213 is movably installed on the screen 212. The conveying starting end of the spiral conveyor 214 is installed and connected to the cleaning and collecting end of the cleaning brush 213. The conveying end of the spiral conveyor 214 is installed and connected above the rotating crushing knife 211;

[0100] The ball milling member 22 includes a rotating housing 221, grinding balls 222, a discharge screen 223 and a discharge vibration motor 224. The grinding balls 222 are placed in the rotating housing 221 and collide with each other driven by the rotation of the rotating housing 221. The discharge screen 223 is installed at the discharge port of the rotating housing 221. The discharge vibration motor 224 is installed and connected to the discharge screen 223.

[0101] The pretreated PTFE raw material enters the crushing cavity. The double-group spiral crushing knives 211 mesh with each other and rotate to initially pulverize the material. The pulverized material is separated by the screen 212 at the bottom of the cavity. The material with a larger particle size is intercepted, and the material with a smaller particle size passes through the screen and enters the physical pulverization component 3. The cleaning brush 213 moves to clean the surface of the screen 212 to prevent the screen from being blocked, and pushes the intercepted material with a larger particle size to the spiral conveyor 214. The spiral conveyor 214 conveys the material collected by the cleaning brush 213 back above the spiral crushing knife 211 for cyclic pulverization until the particle size of the material meets the requirements. The material passing through the screen 212 enters the ball milling member 22 through the conveying device.

[0102] The initially pulverized PTFE material enters the rotating housing 221. The inside of the housing is filled with grinding balls 222. The rotation of the rotating housing 221 drives the grinding balls 222 to collide with each other to finely pulverize the material. The pulverized material is separated by the discharge screen 223. The material with a particle size meeting the requirements passes through the discharge screen and enters the collection device. The discharge vibration motor 224 drives the discharge screen 223 to vibrate to prevent the discharge screen from being blocked and ensure the smooth discharge of the material. The pulverized PTFE fine powder enters the classification and screening component 4 through the conveying device.

[0103] Example 5:

[0104] Based on Embodiment 2, add:

[0105] Referring to Figures 1 - 3 , the physical pulverization assembly 3 includes a low-temperature treatment member 31 and an irradiation treatment member 32. The low-temperature treatment member 31 is respectively connected to the pretreatment assembly 1 and the mechanical milling assembly 2 through a conveying member. The low-temperature treatment member 31 is used for the freezing treatment of PTFE raw materials. The irradiation treatment member 32 is respectively connected to the pretreatment assembly 1 and the mechanical milling assembly 2 through a conveying member. The irradiation treatment member 32 is used for the irradiation treatment of PTFE raw materials;

[0106] The low-temperature treatment member 31 includes a heat preservation housing 311, a heat preservation inner liner 312, a feeding port 313 and a mixing comb 314. The heat preservation housing 311 is wrapped outside the heat preservation inner liner 312. The feeding port 313 passes through the heat preservation housing 311 and communicates with the heat preservation inner liner 312. The feeding port 313 is externally connected to a refrigerant conveying device. A mixing comb 314 is rotatably arranged in the heat preservation inner liner 312;

[0107] The irradiation treatment member 32 includes a protection housing 321 and an irradiation emitter 322. The irradiation emitter 322 is installed in the protection housing 321 and emits irradiation light towards the inner cavity of the protection housing 321.

[0108] The heat preservation housing 311 is wrapped outside the heat preservation inner liner 312 to provide heat insulation, ensure the stability of the low-temperature environment. The heat preservation inner liner 312 is the main cavity for freezing treatment, filled with refrigerant inside to lower the temperature to the required range. The feeding port 313 passes through the heat preservation housing 311 and communicates with the heat preservation inner liner 312, used to add PTFE raw materials and refrigerant. The mixing comb 314 is rotatably installed in the heat preservation inner liner 312 to stir the PTFE raw materials to ensure uniform freezing. The frozen PTFE raw materials enter the mechanical milling assembly 2 through a conveying device.

[0109] The protection housing 321 is the cavity for irradiation treatment, providing safety protection to prevent irradiation leakage. The irradiation emitter 322 is installed in the protection housing 321, emitting irradiation light towards the cavity to irradiate the PTFE raw materials. The irradiated PTFE raw materials enter the mechanical milling assembly 2 through a conveying device.

[0110] Embodiment 6:

[0111] Based on Embodiment 2, add:

[0112] Referring to Figure 1, the grading and screening component 4 includes a vibration screening member 41, a turbine grading member 42, and an electrostatic elimination member 43. The vibration screening member 41 and the turbine grading member 42 are sequentially connected by a conveying device. The electrostatic elimination member 43 is respectively connected to the vibration screening member 41 and the turbine grading member 42, and the electrostatic elimination member 43 is used to eliminate the static electricity of the PTFE fine powder.

[0113] Refer to Figure 2 and Figure 3 , the vibration screening member 41 includes a screening tower 411, a screening vibration motor 412, and a shock absorber seat 413. A plurality of layers of screening meshes are vertically and spacedly arranged in the screening tower 411, and the specifications of the screening meshes decrease sequentially from top to bottom. The screening vibration motor 412 is installed and connected to the screening tower 411, and the shock absorber seat 413 is installed at the bottom of the screening tower 411 to block the vibration of the screening tower 411 from being transmitted to the ground or other equipment;

[0114] The turbine grading member 42 includes a first grading turbine 421, a second grading turbine 422, and a third grading turbine 423. The first grading turbine 421, the second grading turbine 422, and the third grading turbine 423 are sequentially connected by a conveying device, and the grading accuracies of the first grading turbine 421, the second grading turbine 422, and the third grading turbine 423 increase sequentially;

[0115] The electrostatic elimination member 43 includes an ionization rod 431, an antistatic agent input pipe 432, and a protective gas input pipe 433. The ionization rod 431 is installed inside the screening tower 411, the first grading turbine 421, the second grading turbine 422, and the third grading turbine 423. The antistatic agent input pipe 432 is respectively communicated with the screening tower 411, the first grading turbine 421, the second grading turbine 422, and the third grading turbine 423 and is externally connected to an antistatic agent supply device, and the protective gas input pipe 433 is respectively communicated with the screening tower 411, the first grading turbine 421, the second grading turbine 422, and the third grading turbine 423 and is externally connected to a protective gas supply device.

[0116] A plurality of layers of screening meshes are vertically and spacedly arranged in the screening tower 411, and the specifications of the screening meshes decrease sequentially from top to bottom, which is used for grading and screening the PTFE fine powder. The screening vibration motor 412 is installed on the screening tower 411 to drive the screening tower 411 to vibrate and promote the screening of the PTFE fine powder. The shock absorber seat 413 is installed at the bottom of the screening tower 411 to block the vibration of the screening tower 411 from being transmitted to the ground or other equipment.

[0117] The first classification turbine 421 preliminarily classifies the PTFE fine powder to separate particles with larger particle sizes. The second classification turbine 422 further classifies the material processed by the first classification turbine 421 to separate particles with medium particle sizes. The third classification turbine 423 finely classifies the material processed by the second classification turbine 422 to separate particles with smaller particle sizes. The first classification turbine 421, the second classification turbine 422, and the third classification turbine 423 are sequentially connected by a conveying device.

[0118] The ionization rod 431 is installed inside the screening tower 411 to eliminate the static electricity of the PTFE fine powder. The antistatic agent input pipe 432 is respectively connected to the screening tower 411 and is externally connected to an antistatic agent supply device to inject an antistatic agent into the device. The protective gas input pipe 433 is respectively connected to the screening tower 411 and is externally connected to a protective gas supply device to inject a protective gas into the device.

[0119] Example 7:

[0120] Based on Example 2, add:

[0121] Refer to Figures 1 - 3 , the collection and packaging assembly 5 includes a blowing collection component 51 and a vacuum packaging component 52. The blowing collection component 51 and the vacuum packaging component 52 are sequentially connected by a conveying device. The blowing direction of the blowing collection component 51 faces the vacuum packaging component 52;

[0122] The blowing collection component 51 includes a blower 511, a collection cloth bag 512, and a closing valve 513. The blower 511 and the collection cloth bag 512 are installed and connected at the discharge end of the classification and screening assembly 4. The blower 511 blows air towards the collection cloth bag 512. The closing valve 513 is installed at the installation location of the collection cloth bag 512;

[0123] The vacuum packaging component 52 includes a drying box 521, a bagging machine 522, and a vacuum machine 523. The drying box 521 is connected to the bagging machine 522 through a conveying device. The vacuum machine 523 is installed inside the bagging machine 522.

[0124] The blower 511 is installed at the discharge end of the classification and screening assembly 4 and blows air towards the collection cloth bag 512. The collection cloth bag 512 is connected to the discharge end of the classification and screening assembly 4 and is used to collect the PTFE fine powder. The closing valve 513 is installed at the installation location of the collection cloth bag 512 and is used to control the opening and closing of the collection cloth bag 512.

[0125] The drying box 521 is connected to the bagging machine 522 through a conveying device and is used to dry the PTFE fine powder. The bagging machine 522 is used to pack the PTFE fine powder into a packaging bag. The vacuum machine 523 is installed inside the bagging machine 522 and is used to evacuate the packaging bag.

[0126] The above content is only an example and explanation of the structure of the present invention. Those skilled in the art of the present technology can make various modifications or supplements to the described specific embodiments or use similar methods for substitution. As long as they do not deviate from the structure of the invention or exceed the scope defined by this claim book, they should all fall within the protection scope of the present invention.

Claims

1. A pulverizing process for PTFE powder for coating, characterized in that: The crushing steps include: Drying and preliminary crushing of PTFE raw materials; Screen and remove metal impurities and inorganic agglomerate impurities in PTFE raw materials; The dried and preliminarily crushed PTFE raw materials are crushed and ground in turn; The PTFE raw material is subjected to freezing and irradiation treatment and subjected to a crushing and grinding treatment cycle for multiple times, and finally the PTFE raw material is crushed into PTFE micro powder; Screening the PTFE micropowder and finally selecting the qualified PTFE micropowder; Classify qualified PTFE powder; The classified PTFE micropowder is packaged according to different particle sizes.

2. A PTFE powder pulverizing device for coating, characterized in that: include: A pretreatment component (1) is used for pretreatment of PTFE raw materials, including drying, preliminary crushing and impurity removal; A mechanical grinding component (2), the mechanical grinding component (2) being connected to the pretreatment component (1) via a conveying device, and being used for grinding the PTFE raw material to achieve the particle size requirement of the PTFE micropowder for coating; A physical crushing component (3), wherein the physical crushing component (3) is connected to the mechanical grinding component (2) or the pretreatment component (1) via a conveying device, and is used to assist the mechanical grinding component (2) in crushing the PTFE raw material; A grading and screening component (4), wherein the grading and screening component (4) is connected to the physical crushing component (3) via a conveying device and is used to separate the crushed and ground PTFE micropowder according to particle size; A collecting and packaging component (5) is connected to the grading and screening component (4) via a conveying device and is used to seal and package the graded PTFE micropowders respectively.

3. A pulverizing device for PTFE powder for coating according to claim 2, characterized in that: The pretreatment component (1) comprises a drying component (11), a preliminary crushing component (12) and a de-impurity component (13); the drying component (11), the preliminary crushing component (12) and the de-impurity component (13) are connected in sequence via a conveying device; the drying component (11) is used to remove moisture from the PTFE raw material; the preliminary crushing component (12) is used to perform preliminary crushing on the PTFE raw material after the moisture is removed; and the de-impurity component (13) is used to remove impurities, including metal and inorganic agglomerates, from the preliminary crushed PTFE raw material.

4. The pulverizing device for PTFE powder for coating according to claim 3, characterized in that: The drying processing component (11) comprises a heating box (111), an exhaust pipe (112) and a humidity sensor (113); a heating element is arranged inside the heating box (111); the exhaust pipe (112) is connected to the inside of the heating box (111) and to an external exhaust device; and the humidity sensor (113) is installed inside the heating box (111); The preliminary crushing component (12) comprises a push rod (121), a shearing guillotine (122) and a stirring comb (123); the push rod (121) is telescopically installed in a straight groove of the preliminary crushing component (12); the shearing guillotine (122) is movably installed inside the straight groove of the preliminary crushing component (12); the push rod (121) is installed on one side of the shearing guillotine (122) and is telescopically movable toward the shearing guillotine (122); and the stirring comb (123) is rotatably installed on the other side of the shearing guillotine (122); The impurity removal component (13) comprises a magnetic separation roller (131), a blower (132) and a collecting trough (133); the magnetic separation roller (131) is horizontally rotatably installed and connected to the end of the preliminary crushing component (12); the blower (132) is installed on one side below the magnetic separation roller (131) and blows air directly below the magnetic separation roller (131); and the collecting trough (133) is installed below the magnetic separation roller (131) and receives materials falling from the magnetic separation roller (131).

5. The pulverizing device for PTFE powder for coating according to claim 2, characterized in that: The mechanical grinding component (2) comprises a crushing component (21) and a ball mill component (22), wherein the crushing component (21) and the ball mill component (22) are connected in sequence via a conveying device, and the crushing component (21) and the ball mill component (22) crush the PTFE raw material in stages in sequence.

6. The pulverizing device for PTFE powder for coating according to claim 5, characterized in that: The crushing member (21) comprises a spiral crushing knife (211), a screen (212), a cleaning brush (213) and a spiral conveyor (214); the spiral crushing knife (211) is a double group and meshes with each other; the spiral crushing knife (211) is rotatably mounted in the cavity of the crushing member (21); the screen (212) is mounted at the bottom opening of the cavity of the crushing member (21); the cleaning brush (213) is movably mounted on the screen (212); the conveying start end of the spiral conveyor (214) is mounted and connected to the cleaning and collecting end of the cleaning brush (213); and the conveying end of the spiral conveyor (214) is mounted and connected above the spiral crushing knife (211); The ball mill component (22) comprises a rotating shell (221), grinding balls (222), a discharging net (223) and a discharging vibration motor (224); the grinding balls (222) are placed in the rotating shell (221) and are driven by the rotating shell (221) to collide with each other; the discharging net (223) is installed at the discharging port of the rotating shell (221); and the discharging vibration motor (224) is installed and connected to the discharging net (223).

7. The pulverizing device for PTFE powder for coating according to claim 2, characterized in that: The physical pulverization component (3) comprises a cryogenic treatment component (31) and an irradiation treatment component (32), wherein the cryogenic treatment component (31) is respectively connected to the pretreatment component (1) and the mechanical grinding component (2) via a conveying component, and the cryogenic treatment component (31) is used for freezing treatment of PTFE raw materials, and the irradiation treatment component (32) is respectively connected to the pretreatment component (1) and the mechanical grinding component (2) via a conveying component, and the irradiation treatment component (32) is used for irradiation treatment of PTFE raw materials; The low temperature treatment component (31) comprises a heat-insulating shell (311), a heat-insulating inner liner (312), a charging port (313) and a mixing comb (314); the heat-insulating shell (311) is wrapped around the outer side of the heat-insulating inner liner (312); the charging port (313) passes through the heat-insulating shell (311) and is connected to the heat-insulating inner liner (312); the charging port (313) is externally connected to a refrigerant conveying device; and a mixing comb (314) is rotatably arranged in the heat-insulating inner liner (312); The radiation treatment component (32) comprises a protective shell (321) and a radiation emitter (322). The radiation emitter (322) is installed in the protective shell (321) and emits radiation light toward the inner cavity of the protective shell (321).

8. The pulverizing device for PTFE powder for coating according to claim 2, characterized in that: The grading and screening component (4) comprises a vibrating screening component (41), a turbine grading component (42) and a static elimination component (43); the vibrating screening component (41) and the turbine grading component (42) are connected in sequence via a conveying device; the static elimination component (43) is connected to the vibrating screening component (41) and the turbine grading component (42), respectively; and the static elimination component (43) is used to eliminate static electricity of PTFE micropowder.

9. The pulverizing device for PTFE powder for coating according to claim 8, characterized in that: The vibrating screening component (41) comprises a screening tower (411), a screening vibration motor (412) and a shock-absorbing seat (413); multiple layers of screening nets are vertically spaced in the screening tower (411), and the specifications of the screening nets decrease from top to bottom; the screening vibration motor (412) is installed and connected to the screening tower (411); the shock-absorbing seat (413) is installed at the bottom of the screening tower (411) and blocks the transmission of vibration of the screening tower (411) to the ground or other equipment; The turbine classification component (42) comprises a first classification turbine (421), a second classification turbine (422) and a third classification turbine (423); the first classification turbine (421), the second classification turbine (422) and the third classification turbine (423) are connected in sequence through a conveying device; and the classification accuracies of the first classification turbine (421), the second classification turbine (422) and the third classification turbine (423) increase in sequence; The static elimination component (43) includes an ionization rod (431), an antistatic agent input pipe (432) and a protective gas input pipe (433). The ionization rod (431) is installed inside the sieve tower (411), the first classification turbine (421), the second classification turbine (422) and the third classification turbine (423). The antistatic agent input pipe (432) is respectively connected to the sieve tower (411), the first classification turbine (421), the second classification turbine (422) and the third classification turbine (423) and is externally connected to an antistatic agent supply device. The protective gas input pipe (433) is respectively connected to the sieve tower (411), the first classification turbine (421), the second classification turbine (422) and the third classification turbine (423) and is externally connected to a protective gas supply device.

10. The pulverizing device for PTFE powder for coating according to claim 2, characterized in that: The collecting and packaging component (5) comprises an air-blast collecting component (51) and a vacuum packaging component (52), wherein the air-blast collecting component (51) and the vacuum packaging component (52) are connected in sequence via a conveying device, and the air-blast collecting component (51) blows air in a direction toward the vacuum packaging component (52); The air blowing and collecting component (51) comprises an air blower (511), a collecting bag (512) and a closing valve (513); the air blower (511) and the collecting bag (512) are installed and connected at the discharge end of the grading and screening component (4); the air blower (511) blows air toward the collecting bag (512); and the closing valve (513) is installed at the installation position of the collecting bag (512); The vacuum packaging component (52) comprises a drying box (521), a packaging machine (522) and a vacuum machine (523); the drying box (521) is connected to the packaging machine (522) via a conveying device, and the vacuum machine (523) is installed in the packaging machine (522).

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