Preparation method of fine-particle high-efficiency purification composite magnetic filter material

Abstract

The invention discloses a preparation method of a fine particle high-efficiency purification composite magnetic filter material, the prepared composite magnetic filter material is composed of polysulfonamide fiber, a metal net, glass fiber, PTFE mixed metal particle emulsion and carbon fiber, and the structure effectively enhances the magnetizing performance of the metal net and magnetic particles; the filtering effect of the filter material and the performance of the filter material in the dust removal and injection processes are obviously improved; according to the magnetizing device, electromagnets and permanent magnets are arranged in a staggered manner, a Halbach array is combined, and a transducer is arranged, so that the magnetizing efficiency of the filter material is improved. The filter material for efficiently trapping and purifying tiny welding fume can be prepared, the working environment is effectively improved, and the health of workers is protected.

Description

Technical Field

[0001] The invention belongs to the technical field of dust prevention and control, and in particular relates to a method for preparing a fine particle high-efficiency purification composite magnetic filter material. Background Art

[0002] Welding is one of the most important technologies for material forming and processing in modern manufacturing. It is widely used in the manufacturing of structural parts in petrochemical, engineering machinery, electric power, aerospace and marine engineering, as well as in industrial fields such as microelectronics and sensors. Welding fume contains a variety of harmful substances, and long-term inhalation may lead to a variety of occupational diseases, such as welder silicosis, manganese poisoning, and photoelectric conjunctivitis. Therefore, the development of welding fume filtration technology is of great significance for protecting workers' health and improving the working environment.

[0003] Welding fume filtration technology mainly includes source capture filtration, overall fume treatment and overall ventilation. Source capture filtration collects welding fume into the host indoors or outdoors through the fume hood and filters it to meet the standards before discharge; overall fume treatment sets up an air purification device inside the workshop, and directly discharges it into the workshop after filtering and purification; overall ventilation collects and purifies the workshop fume through the air supply and exhaust system, and then discharges it while replenishing fresh air.

[0004] Welding fumes are mainly formed by the volatilization, oxidation and condensation of compounds in welding rods, welding wires and their coating materials, the metal to be welded and their surface treatment layers under high temperature. These fumes contain a variety of harmful substances, such as MnO2, Fe2O3, SiO2, etc. The smallest particle size can reach more than ten nanometers, with strong diffusion and penetration capabilities, and are difficult to be captured. Therefore, achieving efficient control of fine welding fumes has become an international technical challenge. In view of this, it is particularly important to carry out basic research on efficient purification of fine welding fumes. For example, the comparative document with announcement number CN108071020B discloses a filter bag for filtering and recovering non-ferrous metal dust and a preparation method thereof, wherein the adsorption layer is a mixture obtained by blending magnetic nano-iron oxide, polytetrafluoroethylene dispersion emulsion and dispersant emulsion and then curing the mixture, and the mixture is loaded onto a microporous composite filter material by spraying or dipping; on the one hand, the process only has a single iron oxide, which has low magnetic properties and cannot effectively intercept fine particles, and at the same time cannot improve the antioxidant and corrosion resistance of the filter material; on the other hand, the use of iron oxide for mixed curing and spraying increases the dust removal resistance of the filter material, reduces its dust holding effect and shortens the life of the filter material. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing a fine particle high-efficiency purification composite magnetic filter material, which can prepare a filter material that can efficiently capture and purify tiny welding smoke, effectively improve the working environment and protect the health of workers.

[0006] To achieve the above object, the present invention provides a method for preparing a fine particle high-efficiency purification composite magnetic filter material, comprising the following steps:

[0007] Step 1: Fix the metal mesh on the workbench of the multi-axial warp knitting machine to ensure that it is flat and stable, and weave the organic fiber onto the metal mesh through the mesh holes of the metal mesh to form a composite metal mesh filter material;

[0008] Step 2: Use the thread stitching technology to needle the composite metal mesh filter material onto the glass fiber filter material, and perform heat setting treatment at 220°C to fix the structure. After heat setting, perform full saturation impregnation treatment, and use silane coupling agent to enhance the bonding force between fibers to form a composite glass fiber filter material;

[0009] Step 3: Use melt-blown equipment to evenly load PTFE onto the carbon fiber filter material, and then use a hot rolling mill to hot-press the carbon fiber filter material and PTFE. The temperature is controlled between 160 and 230 ° C and the pressure is 1 to 3 kg / cm 2 After the coating is completed, curing treatment is performed to ensure that the PTFE film and the carbon fiber filter material are firmly combined to form a composite carbon fiber filter material;

[0010] Step 4: Mix the acrylic polymer film-forming agent, water-based epoxy paint resin and PTFE emulsion and stir them at a low speed with an electric stirrer, add sodium lauryl sulfate, hydroxyethyl cellulose and hydroxypropyl methylcellulose into deionized water, stir to dissolve the solid, then add the solution into the mixed emulsion, slowly pour it in while stirring with a glass rod, finally add the prepared coating agent into the mixed magnetic particles, stir with an electric stirrer at a speed of 500 rpm for 15 minutes, and foam with a porous foamer;

[0011] Step 5: Use a scraper coating machine to evenly coat the foam-rich PTFE foaming solution between the composite glass fiber filter material and the composite carbon fiber filter material. The distance between the scraper blade and the filter material is 2 mm to ensure that the thickness of the PTFE foaming solution on the filter material surface is not more than 2 mm. Use a glue coating machine to press and remove excess coating liquid between the filter materials, then perform low-temperature drying and high-temperature sintering, and use a high-temperature hot press machine to hot-press and laminate at a hot-pressing temperature of 220 to 240°C, a hot-pressing time of 7 to 10 seconds, and a hot-pressing pressure of 1 to 2 MPa to form a composite magnetic filter material;

[0012] Step 6: Use a magnetizing device to magnetize the composite magnetic filter material. The transmission speed of the magnetizing machine is 0.8m / s.

[0013] As a further solution of the present invention: the material of the metal mesh used in step 1 is a high-carbon steel metal mesh with strong magnetism and residual magnetism. First, the impurities on the surface of the metal mesh are dissolved with an organic solvent, and then an oxide film is formed by chemical oxidation to improve its corrosion resistance and wear resistance.

[0014] As a further solution of the present invention: immersing the cleaned metal mesh in a concentrated sodium hydroxide solution, oxidizing it at a high temperature of 130 to 145°C, and then cleaning the workpiece to remove surface residues; soaking the metal mesh in a soapy water solution at 80 to 100°C to form a layer of iron stearate film to improve corrosion resistance, with the concentration of the saponified solution being 30 to 50 g / L; and finally boiling and washing with hot water to further solidify the film layer.

[0015] As a further solution of the present invention: in step 1, the organic fiber is arylsulfone fiber, and when the arylsulfone fiber is nested and woven with the metal mesh, a weaving knot of the fiber weaving is left at the mesh position of the metal mesh.

[0016] As a further solution of the present invention: Step 4: the mixed magnetic particles include neodymium iron boron particles, aluminum nickel cobalt particles, and barium ferrite particles, and are mixed in a ratio of 7:2:1.

[0017] As a further solution of the present invention: the magnetic device includes a fixed bracket, the fixed bracket is connected to a transmission mechanism and a magnetizing mechanism, the magnetizing mechanism is distributed above and below the transmission mechanism, and the fixed bracket is connected to a heat dissipation system for dissipating heat for the magnetizing mechanism;

[0018] The inlet and outlet ends of the magnetizing mechanism on the fixed bracket are respectively connected with clamping wheels, and the middle area of ​​the magnetizing mechanism on the fixed bracket is connected with a pressing wheel;

[0019] A detection device for detecting the transmission speed and magnetic strength of the composite magnetic filter material is connected to the outlet end of the magnetizing mechanism on the fixed bracket;

[0020] A material receiving device is provided on the fixed bracket at the end of the conveying mechanism;

[0021] A control box for connecting and controlling a transmission mechanism, a magnetizing mechanism, a heat dissipation system, a detection device and a material receiving device is arranged on the fixed bracket.

[0022] As a further solution of the present invention: the conveying mechanism includes a plurality of rollers evenly connected and distributed and a corresponding magnetizing mechanism providing a vibrating transducer for the composite magnetic filter material, a feed roller is provided at the front end of the conveying mechanism, and a motor for driving the feed roller to rotate is provided on the fixed bracket.

[0023] As a further solution of the present invention: the heat dissipation system includes a water-cooled heat sink, a water tank and a blower, the water-cooled heat sink and the water tank are connected through a circulating water pipe, and a water pump is connected to the circulating water pipe;

[0024] The water-cooled heat sink is divided into an air flow area and a water flow area by an air duct. The air duct is provided with an atomizing nozzle connected to the water flow area; the water flow area is provided with a water pipe interface connected to a circulating water pipe, and the air flow area is connected to an air interface for connecting a blower through a guide plate.

[0025] As a further solution of the present invention: the material receiving device includes a movable bracket and a material receiving roller connected to the movable bracket, the fixed bracket is connected to an adjusting rod through a hydraulic cylinder, one end of the adjusting rod is hinged to the fixed bracket, and the other end is connected to a pressure roller.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. In the present invention, aromatic sulfone fiber is nested and woven in a carbon steel metal mesh after oxidation treatment with a sodium hydroxide solution, and a fiber weaving knot is left at the mesh position of the metal mesh. Due to the fiber toughness and the influence of wind force during filtration and cleaning, the weaving knot can move inside and outside the metal mesh, and the dust initial layer can be formed faster during the cleaning function, with high filtration accuracy and high dust volume. The cleaning pressure required during the cleaning process is small, and the cleaning is more thorough under the same cleaning conditions;

[0028] 2. In the present invention, acrylic polymer film-forming agent, water-based epoxy paint resin and PTFE emulsion are used for foaming as a support layer for magnetic particles, and the mesh of the filter material is protected at the same time. The filter material is magnetized, and the external metal mesh is used as the primary magnetic filter, and the foaming layer of the mixed magnetic particles is used as the secondary magnetic filter, which effectively solves the problem that the current welding fume has a small particle size, has extremely strong diffusion and penetration ability, and is difficult to be captured, which is of great significance for protecting the health of workers and improving the working environment;

[0029] 3. The magnetizing device used in the present invention is simple in design and easy to operate. It can be used directly after the filter material is formed, effectively improving work efficiency;

[0030] 4. The heat dissipation system of the present invention dissipates heat by simultaneously using water cooling and water evaporation to absorb heat. The rapid flow of the blower in the air duct accelerates evaporation and more effectively handles the heat generated by high-power hardware. The water in the heat dissipation system can act as a buffer and filter out part of the environmental fluctuations, thereby making the unit run more smoothly, while evaporative cooling can cope with direct environmental fluctuations, thereby improving the safety and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the magnetizing device in the present invention;

[0032] Figure 2 It is a structural schematic diagram of the transmission mechanism in the present invention;

[0033] Figure 3 It is a schematic diagram of the cross-sectional structure of the magnetizing device in the present invention;

[0034] Figure 4 It is a structural schematic diagram of the electromagnet in the present invention;

[0035] Figure 5 It is a structural schematic diagram of the detection device in the present invention;

[0036] Figure 6 It is a schematic diagram of the structure of the pressing wheel in the present invention;

[0037] Figure 7 It is a structural schematic diagram of the heat dissipation system in the present invention;

[0038] Figure 8 It is a schematic diagram of the structure of the composite metal mesh filter material in the present invention;

[0039] Fig. 9 It is a schematic diagram of the side structure of the composite metal mesh filter material in the present invention.

[0040] In the figure: 1, conveying mechanism, 11, motor, 12, feed roller, 13, roller, 14, transducer;

[0041] 2. Clamping mechanism, 21. Clamping wheel, 22. Pressing wheel, 221. Spring, 222. Telescopic rod, 223. Rubber wheel;

[0042] 3. magnetizing mechanism, 31. electromagnet, 32. permanent magnet, 311. copper wire, 312. silicon steel sheet;

[0043] 4. Cooling system, 41. Water cooling radiator, 42. Water tank, 43. Water pump, 44. Blower, 411. Atomizing nozzle, 412. Air duct, 413. Guide plate, 414. Air interface, 415. Water pipe interface;

[0044] 5. Control box;

[0045] 6. Detection device, 61. Detector, 611. Metal probe, 612. Detection rubber wheel;

[0046] 7. Material receiving device, 71. Pressing roller, 72. Hydraulic rod, 73. Material receiving roller, 74. Moving bracket;

[0047] 8. Fix the bracket;

[0048] 9. Composite metal mesh filter material, 91. Metal mesh, 92. Braided knot, 93. Aromatic sulfone fiber. DETAILED DESCRIPTION

[0049] The present invention will be further described below by way of examples.

[0050] A method for preparing a fine particle high-efficiency purification composite magnetic filter material comprises the following steps:

[0051] Step 1: Fix the metal mesh 91 on the workbench of the multi-axial warp knitting machine to ensure that it is flat and stable, and weave the organic fibers onto the metal mesh 91 through the mesh holes of the metal mesh 91 to form a composite metal mesh filter material 9, such as Figure 8 As shown;

[0052] Step 2: Use the thread suture technology to pierce the composite metal mesh filter material 9 on the glass fiber filter material, and perform heat setting treatment at 220°C to fix the structure. After heat setting, perform full saturation impregnation treatment, use silane coupling agent to enhance the bonding force between fibers, and form a composite glass fiber filter material;

[0053] Step 3: Use melt-blown equipment to evenly load PTFE onto the carbon fiber filter material, and then use a hot rolling mill to hot-press the carbon fiber filter material and PTFE. The temperature is controlled between 160 and 230 ° C and the pressure is 1 to 3 kg / cm 2 After the coating is completed, curing treatment is performed to ensure that the PTFE film and the carbon fiber filter material are firmly combined to form a composite carbon fiber filter material;

[0054] Step 4: Mix the acrylic polymer film-forming agent, water-based epoxy paint resin and PTFE emulsion and stir them at a low speed with an electric stirrer, add sodium lauryl sulfate, hydroxyethyl cellulose and hydroxypropyl methylcellulose into deionized water, stir to dissolve the solid, then add the solution into the mixed emulsion, slowly pour it in while stirring with a glass rod, finally add the prepared coating agent into the mixed magnetic particles, stir with an electric stirrer at a speed of 500 rpm for 15 minutes, and foam with a porous foamer;

[0055] Step 5: Use a scraper coating machine to evenly coat the foam-rich PTFE foaming solution between the composite glass fiber filter material and the composite carbon fiber filter material. The distance between the scraper blade and the filter material is 2 mm to ensure that the thickness of the PTFE foaming solution on the filter material surface is not more than 2 mm. Use a glue coating machine to press and remove excess coating liquid between the filter materials, then perform low-temperature drying and high-temperature sintering, and use a high-temperature hot press machine to hot-press and laminate at a hot-pressing temperature of 220 to 240°C, a hot-pressing time of 7 to 10 seconds, and a hot-pressing pressure of 1 to 2 MPa to form a composite magnetic filter material;

[0056] Step 6: Use a magnetizing device to magnetize the composite magnetic filter material. The transmission speed of the magnetizing machine is 0.8m / s.

[0057] Furthermore, the material of the metal mesh 91 used in step 1 is a high-carbon steel metal mesh 91 with strong magnetism and residual magnetism. First, an organic solvent is used to dissolve impurities on the surface of the metal mesh 91, and then an oxide film is formed by chemical oxidation to improve its corrosion resistance and wear resistance.

[0058] Specifically, the cleaned metal mesh 91 is immersed in a concentrated sodium hydroxide solution and oxidized at a high temperature of 130 to 145° C., and then the workpiece is cleaned to remove surface residues; the metal mesh 91 is soaked in a soapy water solution at 80 to 100° C. to form a layer of iron stearate film to improve corrosion resistance, and the concentration of the saponified solution is 30 to 50 g / L; finally, hot water boiling is performed to further solidify the film layer.

[0059] Furthermore, in step 1, the organic fiber is an aromatic sulfone fiber 93, and when the aromatic sulfone fiber 93 is nested and woven with the metal mesh 91, a fiber weaving knot 92 is left at the mesh position of the metal mesh 91, such as Fig. 9 shown.

[0060] Furthermore, in step four, the mixed magnetic particles include neodymium iron boron particles, aluminum nickel cobalt particles, and barium ferrite particles, and are mixed in a ratio of 7:2:1.

[0061] In order to realize the magnetization of the composite magnetic filter material, further, such as Figures 1 to 3 As shown, the magnetic device includes a fixed bracket 8, to which a conveying mechanism 1 and a magnetizing mechanism 3 are connected. The magnetizing mechanism 3 is distributed above and below the conveying mechanism 1, and a heat dissipation system 4 for dissipating heat for the magnetizing mechanism 3 is connected to the fixed bracket 8;

[0062] The fixed bracket 8 is connected to the inlet and outlet ends of the magnetizing mechanism 3 with clamping wheels 21, and the fixed bracket 8 is connected to the middle area of ​​the magnetizing mechanism 3 with a pressing wheel 22; the clamping wheel 21 cooperates with the pressing wheel 22 to form a clamping mechanism 2. Figure 6 As shown, the pressing wheel 22 includes a telescopic rod 222 connected to the fixed bracket 8, the end of the telescopic rod 222 is connected to a rubber wheel 223, and a spring 221 is sleeved on the telescopic rod 222 to use elastic potential energy to maintain the rubber wheel 223 pressing the filter material and reduce the wear of the rubber wheel 223 caused by vibration;

[0063] A detection device 6 for detecting the transmission speed and magnetic strength of the composite magnetic filter material is connected to the outlet end of the magnetizing mechanism 3 on the fixed bracket 8;

[0064] The detection device 6 is located on the filter material at the outlet of the magnetizing mechanism 3, and includes a detector 61 for detecting the speed and magnetic strength of the composite magnetic filter material. The detection is performed after the filter material passes through the magnetizing area. The detector 61 measures the magnetic strength of the filter material surface through a metal probe 611, and measures the filter material speed through the detection rubber wheels 612 connected to the two ends of the detector 61 and the filter material, so as to adjust the magnetization time and magnetization strength to ensure a better magnetization effect;

[0065] A material receiving device 7 is provided on the fixed bracket 8 at the end of the conveying mechanism 1;

[0066] A control box 5 connected to control the conveying mechanism 1 , the magnetizing mechanism 3 , the heat dissipation system 4 , the detection device 6 and the material receiving device 7 is provided on the fixed bracket 8 .

[0067] Further, such as Figure 2 As shown, the conveying mechanism 1 includes a plurality of rollers 13 evenly connected and distributed and a vibration transducer 14 corresponding to the magnetizing mechanism 3 for the composite magnetic filter material. A feed roller 12 is provided at the front end of the conveying mechanism 1, and a motor 11 for driving the feed roller 12 to rotate is provided on the fixed bracket 8. The rollers 13 can reduce the friction resistance of the filter material during the conveying process; Figure 3 As shown, the magnetizing mechanism 3 has electromagnets 31 and permanent magnets 32 arranged in a radial array and a tangential array to form a Halbach array. The Halbach array strengthens the magnetic field and the transducer 14 provides vibration to the filter material to enhance the magnetization effect of the filter material.

[0068] like Figure 4 As shown, the core material of the electromagnet 31 is made of stacked silicon steel sheets 312 to ensure efficient conduction of magnetic flux and at the same time weaken the eddy current effect generated when power is turned on to reduce the thermal effect. The copper wire 311 is wound around the core in a spiral shape along the stacking direction of the silicon steel sheets 312.

[0069] Furthermore, the heat dissipation system 4 includes a water-cooled heat sink 41, a water tank 42 and a blower 44. The water-cooled heat sink 41 and the water tank 42 are connected through a circulating water pipe, and a water pump 43 is connected to the circulating water pipe.

[0070] The water-cooled heat sink 41 is divided into an air flow area and a water flow area by an air duct 412. The air duct 412 is provided with an atomizing nozzle 411 connected to the water flow area; the water flow area is provided with a water pipe interface 415 connected to a circulating water pipe, and the air flow area is connected to an air interface 414 for connecting to a blower 44 through a guide plate 413.

[0071] The cross-section of the air duct 412 is a fan-shaped with an angle of 25° to 30°. The atomizing nozzle 411 is arranged at the position of the angle. During use, the pressure of the water pump 43 will spray water mist through the atomizing nozzle 411 to moisten the inner wall of the air duct 412. The blower 44 promotes air circulation in the air duct 412 to accelerate the evaporation of water on the inner wall of the air duct 412, thereby taking away heat. The combination of water cooling and water vapor evaporation ensures the heat dissipation effect of the magnetizing mechanism 3.

[0072] Furthermore, the material receiving device 7 includes a movable bracket 74 and a material receiving roller 73 connected to the movable bracket 74. The fixed bracket 8 is connected to an adjusting rod through a hydraulic rod 72. One end of the adjusting rod is hinged to the fixed bracket 8, and the other end is connected to a pressure roller 71.

[0073] The pressure between the pressure roller 71 and the receiving roller 73 can be adjusted and controlled by the hydraulic rod 72, which can be achieved through pressure sensing, thereby ensuring that the magnetized filter material can be tightly rolled.

Claims

1. A method for preparing a fine particle high-efficiency purification composite magnetic filter material, characterized in that: The following steps are involved: Step 1: fix the metal mesh (91) on the workbench of the multi-axial warp knitting machine to ensure that it is flat and stable, and weave the organic fibers onto the metal mesh (91) through the mesh holes of the metal mesh (91) to form a composite metal mesh filter material (9); Step 2: using a thread stitching technique to needle-puncture the composite metal mesh filter material (9) onto the glass fiber filter material, and heat-setting treatment at 220° C. to fix the structure, and after heat-setting, full saturation impregnation treatment is performed, and a silane coupling agent is used to enhance the bonding force between the fibers to form a composite glass fiber filter material; Step 3: Use melt-blown equipment to evenly load PTFE onto the carbon fiber filter material, and then use a hot rolling mill to hot-press the carbon fiber filter material and PTFE. The temperature is controlled between 160 and 230 ° C and the pressure is 1 to 3 kg / cm 2 After the coating is completed, curing treatment is performed to ensure that the PTFE film and the carbon fiber filter material are firmly combined to form a composite carbon fiber filter material; Step 4: Mix the acrylic polymer film-forming agent, water-based epoxy paint resin and PTFE emulsion and stir them at a low speed with an electric stirrer, add sodium lauryl sulfate, hydroxyethyl cellulose and hydroxypropyl methylcellulose into deionized water, stir to dissolve the solid, then add the solution into the mixed emulsion, slowly pour it in while stirring with a glass rod, finally add the prepared coating agent into the mixed magnetic particles, stir with an electric stirrer at a speed of 500 rpm for 15 minutes, and foam with a porous foamer; Step 5: Use a scraper coating machine to evenly coat the foam-rich PTFE foaming solution between the composite glass fiber filter material and the composite carbon fiber filter material. The distance between the scraper blade and the filter material is 2 mm to ensure that the thickness of the PTFE foaming solution on the filter material surface is not more than 2 mm. Use a glue coating machine to press and remove excess coating liquid between the filter materials, then perform low-temperature drying and high-temperature sintering, and use a high-temperature hot press machine to hot-press and laminate at a hot-pressing temperature of 220 to 240°C, a hot-pressing time of 7 to 10 seconds, and a hot-pressing pressure of 1 to 2 MPa to form a composite magnetic filter material; Step 6: Use a magnetizing device to magnetize the composite magnetic filter material. The transmission speed of the magnetizing machine is 0.8m / s.

2. The method for preparing a fine particle high-efficiency purification composite magnetic filter material according to claim 1, characterized in that: The material of the metal mesh (91) used in step 1 is a high-carbon steel metal mesh (91) with strong magnetism and remanence. First, an organic solvent is used to dissolve impurities on the surface of the metal mesh (91), and then an oxide film is formed by chemical oxidation to improve its corrosion resistance and wear resistance.

3. The method for preparing a fine particle high-efficiency purification composite magnetic filter material according to claim 2, characterized in that: The cleaned metal mesh (91) is immersed in a concentrated sodium hydroxide solution and oxidized at a high temperature of 130-145° C., and then the workpiece is cleaned to remove surface residues; the metal mesh (91) is soaked in a soapy water solution at 80-100° C. to form a layer of iron stearate film to improve corrosion resistance, and the concentration of the saponified solution is 30-50 g / L; and finally, hot water is used for boiling and washing to further solidify the film layer.

4. The method for preparing a fine particle high-efficiency purification composite magnetic filter material according to any one of claims 1 to 3, characterized in that: Step 1: The organic fiber is arylsulfone fiber (93). When the arylsulfone fiber (93) and the metal mesh (91) are nested and woven, a fiber weaving knot (92) is left at the mesh position of the metal mesh (91).

5. The method for preparing a fine particle high-efficiency purification composite magnetic filter material according to claim 1, characterized in that: Step 4: Mixing magnetic particles including neodymium iron boron particles, aluminum nickel cobalt particles, and barium ferrite particles, and mixing them in a ratio of 7:2:

1.

6. The method for preparing a fine particle high-efficiency purification composite magnetic filter material according to claim 1, characterized in that: The magnetic device comprises a fixed bracket (8), the fixed bracket (8) is connected to a transmission mechanism (1) and a magnetizing mechanism (3), the magnetizing mechanism (3) is distributed above and below the transmission mechanism (1), and the fixed bracket (8) is connected to a heat dissipation system (4) for dissipating heat from the magnetizing mechanism (3); The inlet end and the outlet end of the fixed bracket (8) located at the magnetizing mechanism (3) are respectively connected to clamping wheels (21), and the middle area of ​​the fixed bracket (8) located at the magnetizing mechanism (3) is connected to a pressing wheel (22); A detection device (6) for detecting the transmission speed and magnetic strength of the composite magnetic filter material is connected to the outlet end of the magnetizing mechanism (3) on the fixed bracket (8); A material receiving device (7) is provided on the fixed bracket (8) at the end of the conveying mechanism (1); A control box (5) connected to control the conveying mechanism (1), the magnetizing mechanism (3), the heat dissipation system (4), the detection device (6) and the material receiving device (7) is provided on the fixed bracket (8).

7. The method for preparing a fine particle high-efficiency purification composite magnetic filter material according to claim 6, characterized in that: The conveying mechanism (1) comprises a plurality of rollers (13) evenly connected and distributed, and a vibrating transducer (14) corresponding to the magnetizing mechanism (3) for providing the composite magnetic filter material. A feed roller (12) is provided at the front end of the conveying mechanism (1), and a motor (11) for driving the feed roller (12) to rotate is provided on the fixed bracket (8).

8. The method for preparing a fine particle high-efficiency purification composite magnetic filter material according to claim 6, characterized in that: The heat dissipation system (4) comprises a water-cooled heat sink (41), a water tank (42) and a blower (44); the water-cooled heat sink (41) and the water tank (42) are connected via a circulating water pipe, and a water pump (43) is connected to the circulating water pipe; The water-cooled heat sink (41) is divided into an air flow area and a water flow area by an air duct (412); an atomizing nozzle (411) connected to the water flow area is provided on the air duct (412); a water pipe interface (415) connected to a circulating water pipe is provided in the water flow area; and an air interface (414) for connecting to a blower (44) is connected to the air flow area via a guide plate (413).

9. The method for preparing a fine particle high-efficiency purification composite magnetic filter material according to claim 6, characterized in that: The material receiving device (7) comprises a movable bracket (74) and a material receiving roller (73) connected to the movable bracket (74); an adjusting rod is connected to the fixed bracket (8) via a hydraulic rod (72); one end of the adjusting rod is hinged to the fixed bracket (8), and the other end is connected to a pressing roller (71).

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