A soft magnetic powder coating device and a soft magnetic powder coating process

Abstract

The application belongs to the field of soft magnetic powder coating and provides a soft magnetic powder coating device and a soft magnetic powder coating process, which comprise a reaction kettle, a heat exchanger is arranged on the lower part of the side wall of the reaction kettle, a stirring assembly is arranged on the stirring assembly, a stirring bin is arranged on the stirring assembly, a first feeding end is arranged on the upper end of the stirring bin, the first feeding end is used for feeding soft magnetic powder, a dust removal bag and a second feeding end are arranged on both sides of the upper part of the stirring bin, the second feeding end is used for feeding insulating accessories and alcohol, an alcohol recovery assembly is arranged on the alcohol recovery assembly, a filter and a condenser are arranged on the alcohol recovery assembly, the heat exchanger is opened while the stirring bin is stirred by feeding through the first feeding end and the second feeding end, the dust removal bag can absorb the dust in the stirring bin, and the condenser can recover the evaporated alcohol when the soft magnetic powder flows to the reaction kettle after coating. Compared with the prior art, the dust removal bag recovery can prevent dust from being exposed to the air, the condenser can recover and utilize alcohol, and energy consumption can be reduced by recycling.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of soft magnetic powder coating, and particularly relates to a soft magnetic powder coating device and a soft magnetic powder coating process. BACKGROUND

[0002] The soft magnetic powder coating is a material composed of soft magnetic powder and insulating medium, and has high saturation magnetic induction intensity, high magnetic permeability, high resistivity and frequency stability. In the soft magnetic powder coating process, a large amount of dust and a large amount of auxiliary solvent (such as alcohol) in the insulating medium are generated by the added soft magnetic powder. In the existing magnetic powder coating production industry, a smooth open type and a semi-smooth open type coating are used, and the coating auxiliary solvent (such as alcohol) and dust are not recycled, which causes certain harm to the front-line operators and the environment and causes excessive waste of the auxiliary solvent.

[0003] After the raw material such as iron-silicon-aluminum powder is coated, the requirements of uniform coating layer on the surface of powder particles, same color, and no adhesion and caking phenomenon between particles are achieved. The existing coating is completed by using the principle of tumbling friction. The coating material is added in the friction movement, and the outside of the container is heated. The heat is conducted by the particles to particles as a medium. When the coated particles are almost dry, the coating layer is formed under the action of friction. Since the friction on the surface of the coating layer is inconsistent, the thickness of the coating layer is not uniform, the color difference is caused, the insulation value is changed, the heating efficiency is low, and the energy consumption is high. SUMMARY

[0004] The application aims to solve the technical problems of the prior art, and provides a soft magnetic powder coating device and a soft magnetic powder coating process.

[0005] To solve the above technical problems, the application provides a soft magnetic powder coating device, which comprises a reaction kettle, a heat exchanger is arranged on the lower side wall of the reaction kettle;

[0006] A stirring assembly is arranged on the upper end of the reaction kettle, a stirring bin is arranged on the stirring assembly, a first feeding end is arranged on the upper end of the stirring bin, the first feeding end is used for feeding soft magnetic powder, a dust removal bag and a second feeding end are arranged on both sides of the upper part of the stirring bin, and the second feeding end is used for feeding insulating auxiliary materials and alcohol;

[0007] An alcohol recovery assembly is arranged on the upper side wall of the reaction kettle, a filter and a condenser are arranged on the alcohol recovery assembly, the front end of the filter is arranged on the upper side wall of the reaction kettle, the condenser is connected to the rear end of the filter, and alcohol enters the condenser through the filter;

[0008] The heat exchanger is opened while the stirring bin is stirred by feeding through the first feeding end and the second feeding end, the dust removal bag can absorb the dust in the stirring bin, and the condensing piece can recover the evaporated alcohol when the soft magnetic powder coating flows to the reaction kettle.

[0009] In the soft magnetic powder coating device, the stirring bin side wall is provided with a stirring motor, the output end of the stirring motor is provided with stirring blades, a first valve is arranged at the first feeding end, a second valve is arranged at the second feeding end, and a third valve is arranged at the lower part of the stirring bin.

[0010] In the soft magnetic powder coating device, the lower end of the stirring bin is connected with a pressurized bin, compressed air pipes and alcohol cleaning pipes are arranged on the two sides of the pressurized bin respectively, a fourth valve is arranged on the alcohol cleaning pipe, a fifth valve is arranged on the compressed air pipe, a discharge pipe is arranged at the lower part of the pressurized bin, the discharge pipe is connected with the upper part of the reaction kettle, and a discharge valve is arranged on the discharge pipe.

[0011] In the soft magnetic powder coating device, the upper end of the reaction kettle is provided with a high-speed spraying motor, the output end of the high-speed spraying motor is provided with a rotating rod, a connecting pipe is sleeved on the rotating rod, the upper part of the connecting pipe is connected with the high-speed spraying motor, a space is arranged between the rotating rod and the connecting pipe, the lower end of the discharge pipe passes through the connecting pipe and is located in the space, a spraying opening is arranged at the lower end of the rotating rod, the lower end of the reaction kettle is provided with a material collecting end, a material collecting valve is arranged on the material collecting end, and a sixth valve is arranged at the connection position of the reaction kettle and the heat exchanger.

[0012] In the soft magnetic powder coating device, the filtering piece comprises an air filter, one side of the air filter is connected with a flow pipe, the flow pipe is communicated with the upper side wall of the reaction kettle, the other side of the air filter is connected with an air return pipe, the condensing piece is connected at the end of the air return pipe, a seventh valve is arranged on the air return pipe, and a dust recovery bag is arranged at the lower end of the air filter.

[0013] In the soft magnetic powder coating device, a condenser is arranged on the condensing piece, the front end of the condenser is communicated with the air return pipe, alcohol pipes and air exhaust pipes are arranged at the rear end of the condenser respectively, and an air exhaust fan is arranged on the air exhaust pipe.

[0014] The application also provides a soft magnetic powder coating process, which is carried out by using the above soft magnetic powder coating device and comprises the following steps.

[0015] (1) Start the stirring motor, add the soft magnetic powder from the first feeding end, close the first valve, open the second valve, add the coating material dispersion liquid and cleaning liquid from the second feeding end, close the second valve, open the sixth valve on the heat exchanger to heat the reaction kettle, stir to obtain the mixed material, open the third valve to make the mixed material enter the pressurized bin, and close the third valve;

[0016] (2) Start the high-speed spraying motor, open the fifth valve on the compressed air pipe, open the discharge valve, and the mixed material enters the reaction kettle through the spraying port for drying, the cleaning liquid is recovered by the condenser after passing through the air filter, and the dry coated soft magnetic powder is collected after the collection valve is opened.

[0017] The soft magnetic powder coating process of the present application is carried out in a soft magnetic powder coating device, and the soft magnetic powder coating is carried out by high-speed rotary spraying combined with rotary hot air drying. The drying is completed in the dispersed hot air flow, the drying process time is relatively short, the coating layer is bright and uniform in color, the coating layer thickness is the same, and the particles are not adhered. The heat source of the heat exchanger is provided by the exhaust port of the workshop annealing furnace, and the heat energy provided by the conversion saves energy and improves production efficiency.

[0018] In the above-mentioned soft magnetic powder coating process, the soft magnetic powder is iron-silicon-aluminum powder.

[0019] In the above-mentioned soft magnetic powder coating process, the addition amount of the soft magnetic powder and the coating material dispersion liquid is 40% of the original production process, and the product quality after coating is improved by 6.6% (the original qualified rate is 93%, and the current qualified rate is 99.6%).

[0020] In the above-mentioned soft magnetic powder coating process, the coating material dispersion liquid is formed by dispersing the coating material in a solvent, and the coating material is not limited, and any material that can coat the soft magnetic powder can be used.

[0021] In the above-mentioned soft magnetic powder coating process, the cleaning liquid is alcohol, which is sprayed through the spraying port to clean the inner surface of the coating machine, and the amount used each time is 300-600g. The recovery rate of alcohol can reach more than 60%, and according to the production amount, the daily production of coated powder is 20T, the alcohol input amount is 5% of 20T, that is, 1000kg (10yuan / kg), which can save 10,000 yuan of production cost.

[0022] In the above-mentioned soft magnetic powder coating process, the frequency of the stirring motor is 18-25Hz, and the main shaft speed is 80-120rpm / min.

[0023] In the above-mentioned soft magnetic powder coating process, the reaction kettle is heated to 90-100℃.

[0024] In the above-mentioned soft magnetic powder coating process, the sixth valve on the heat exchanger is opened for 15-20min.

[0025] In the soft magnetic powder coating process, the air pressure in the compressed air pipe is 0.4-0.8 MPa.

[0026] In the soft magnetic powder coating process, the mixed material is injected into the spraying port 30-50 min after the discharge valve is opened.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] (1) The dust removal bag recovery can prevent dust from being exposed to the air, achieve a closed dust removal effect, reduce the physical harm to workers, be environmentally friendly, reduce labor intensity, and recycle alcohol in the condensing part, thereby achieving energy saving and consumption reduction and reducing production cost.

[0029] (2) The valves arranged between the various connecting parts can achieve a fully closed effect when processing dust inside the soft magnetic powder equipment, prevent dust from being scattered into the air to pollute the environment and harm workers.

[0030] (3) The alcohol can clean the inner wall of the pressurized bin to make the soft magnetic powder particles fall off, and the compressed air pipe introduces compressed air to increase the pressure, which can quickly make the coated soft magnetic powder flow into the reaction kettle from the discharge pipe.

[0031] (4) The present application adopts high-speed rotary spraying combined with rotary hot air drying to coat the soft magnetic powder, the drying process time is relatively short, the coating layer is bright and uniform in color, the thickness is the same, and the particles are not adhered;

[0032] (5) The solvent recovery rate in the present application can reach more than 60%, the heat source is provided by the heat exchanger added to the exhaust port of the workshop annealing furnace, and the heat energy provided after conversion saves energy and improves production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a perspective view of the soft magnetic powder coating equipment.

[0034] In the figure, 1 is a reaction kettle, 2 is a heat exchanger, 3 is a stirring bin, 4 is a first feeding end, 5 is a dust removal bag, 6 is a second feeding end, 7 is a stirring motor, 8 is a stirring blade, 9 is a first valve, 10 is a second valve, 11 is a third valve, 12 is a pressurized bin, 13 is a compressed air pipe, 14 is an alcohol cleaning pipe, 15 is a fourth valve, 16 is a fifth valve, 17 is a discharge pipe, 18 is a discharge valve, 19 is a high-speed spraying motor, 20 is a rotating rod, 21 is a connecting pipe, 22 is a spraying port, 23 is a material collecting end, 24 is a material collecting valve, 25 is a sixth valve, 26 is an air filter, 27 is a flow pipe, 28 is a return air pipe, 29 is a seventh valve, 30 is a dust recovery bag, 31 is a condenser, 32 is an alcohol pipe, 33 is an air extraction pipe, and 34 is an air extractor. DETAILED DESCRIPTION

[0035] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0036] As shown in Figure 1 The soft magnetic powder coating device comprises a reaction kettle 1, a heat exchanger 2 arranged on the lower side wall of the reaction kettle 1, a stirring assembly arranged on the upper end of the reaction kettle 1, a stirring bin 3 arranged on the stirring assembly, a first feeding end 4 arranged on the upper end of the stirring bin 3, the first feeding end 4 being used for feeding soft magnetic powder, a dust removal bag 5 and a second feeding end 6 arranged on the upper part of the stirring bin 3 on both sides respectively, the second feeding end 6 being used for feeding insulating auxiliary materials and alcohol, an alcohol recovery assembly arranged on the upper side wall of the reaction kettle 1, a filter and a condenser arranged on the alcohol recovery assembly, the filter being arranged on the upper side wall of the reaction kettle 1 at the front end, the condenser being connected to the rear end of the filter, and the alcohol entering the condenser through the filter. The heat exchanger 2 is opened while the stirring bin 3 is stirred by feeding through the first feeding end 4 and the second feeding end 6, and the dust removal bag 5 can absorb the dust in the stirring bin 3. When the soft magnetic powder flows to the reaction kettle 1 after coating, the condenser can recover the evaporated alcohol.

[0037] The soft magnetic powder is conductive, and the soft magnetic powder coating refers to coating a layer of insulating material on the soft magnetic powder particles. When the soft magnetic powder is fed into the stirring bin 3 from the first feeding end 4, dust will be generated, and a certain amount of dust will be generated during stirring. Because of the addition of the soft magnetic powder, there is a pressure difference in the stirring bin 3, so the air drives the dust to be discharged to the dust removal bag 5. The dust removal bag 5 plays a role in pressure balance and can also seal and absorb the dust. The insulating auxiliary materials and alcohol enter the stirring bin 3 through the second feeding end 6. After feeding, the stirring bin 3 is stirred to make the insulating auxiliary materials coated on the soft magnetic powder. The insulating auxiliary materials used for coating have high concentration and poor fluidity. The alcohol acts as a solvent to dilute the insulating materials. At the same time, the heat exchanger 2 is opened to preheat the inside of the reaction kettle 1. The coated soft magnetic powder is in a flowing state. When the soft magnetic powder in the stirring bin 3 is coated, it flows downward into the reaction kettle 1. At this time, the reaction kettle 1 has been preheated. Preferably, the temperature in the reaction kettle 1 is controlled at 90°-100°. The coated soft magnetic powder is dried in the reaction kettle 1, and the soft magnetic powder particles will not stick together. Preferably, the drying time is 1-2 seconds. The alcohol can evaporate in the heated reaction kettle 1 and be recovered through the filter and the condenser. The dust removal bag 5 can prevent the dust from being exposed to the air, has a closed dust removal effect, reduces the harm to the workers, is environmentally friendly, and reduces the labor intensity. In the production process, a large amount of alcohol solvent is needed for soft magnetic powder coating. The condenser can recover the alcohol for reuse, energy saving, and cost reduction.

[0038] As shown in Figure 1As shown, the stirring bin 3 side wall is provided with a stirring motor 7, the output end of the stirring motor 7 is provided with a stirring blade 8, a first valve 9 is provided at the first feeding end 4, a second valve 10 is provided at the second feeding end 6, and a third valve 11 is provided at the lower part of the stirring bin 3.

[0039] The stirring motor 7 is started, after the soft magnetic powder, the insulating auxiliary material and the alcohol are added, the soft magnetic powder coating operation is carried out in the fully closed stirring bin 3 after the first valve 9, the second valve 10 and the third valve 11 are closed, the dust is recycled through the dust removal bag 5, and the environment is prevented from being polluted and the workers are prevented from being harmed.

[0040] As shown in Figure 1 The lower end of the stirring bin 3 is connected with a pressurizing bin 12, the pressurizing bin 12 is provided with a compressed air pipe 13 and an alcohol cleaning pipe 14 on the two sides respectively, a fourth valve 15 is provided on the alcohol cleaning pipe 14, a fifth valve 16 is provided on the compressed air pipe 13, a discharge pipe 17 is provided at the lower part of the pressurizing bin 12, the discharge pipe 17 is connected with the upper part of the reaction kettle 1, and a discharge valve 18 is provided on the discharge pipe 17.

[0041] Under normal conditions, the pressurizing bin 12 is at normal pressure, the soft magnetic powder is sticky and has poor flowability before drying after the coating, the third valve 11 is first opened to make the coated soft magnetic powder fall into the pressurizing bin 12 from the stirring bin 3, the fourth valve 15 is opened to add alcohol, the alcohol can clean the inner wall of the pressurizing bin 12 to make the soft magnetic powder particles fall off, then the third valve 11 is closed, the fifth valve 16 and the discharge valve 18 are opened, and the compressed air is introduced to increase the pressure, so that the coated soft magnetic powder can quickly flow into the reaction kettle 1 from the discharge pipe 17.

[0042] As shown in Figure 1 The upper end of the reaction kettle 1 is provided with a high-speed spraying motor 19, the output end of the high-speed spraying motor 19 is provided with a rotating rod 20, the rotating rod 20 is sleeved with a connecting pipe 21, the upper part of the connecting pipe 21 is connected with the high-speed spraying motor 19, a space is formed between the rotating rod 20 and the connecting pipe 21, the lower end of the discharge pipe 17 penetrates through the connecting pipe 21 and is located in the space, a spraying port 22 is rotationally arranged at the lower end of the rotating rod 20, a material collecting end 23 is arranged at the lower end of the reaction kettle 1, a material collecting valve 24 is arranged on the material collecting end 23, and a sixth valve 25 is arranged at the connection between the reaction kettle 1 and the heat exchanger 2.

[0043] The connecting pipe 21 is sleeved on the rotating rod 20, the discharge pipe 17 is connected in the space between the connecting pipe 21 and the rotating rod 20, the high-speed spraying motor 19 drives the rotating rod 20 to rotate and drives the spraying port 22 to rotate, the coated flowing soft magnetic powder flows on the spraying port 22 from the discharge pipe 17, the spraying port 22 sprays the flowing soft magnetic powder in the reaction kettle 1 in a high-speed rotating state, after the spraying is completed, the high-speed spraying motor 19 is closed, the flowing soft magnetic powder is dried, the alcohol is evaporated and recovered, the heat exchanger 2 is closed, and the material collecting valve 24 is opened to complete the material collection.

[0044] As shown in Figure 1 The filter includes an air filter 26, one side of the air filter 26 is connected with a flow pipe 27, the flow pipe 27 is communicated with the upper side wall of the reaction kettle 1, the other side of the air filter 26 is connected with an air return pipe 28, a condensing member is connected at the end of the air return pipe 28, a seventh valve 29 is arranged on the air return pipe 28, and a dust recovery bag 30 is arranged at the lower end of the air filter 26.

[0045] The seventh valve 29 is opened, the alcohol evaporated in the reaction kettle 1 is sucked into the air filter through air suction from the air return pipe 28, the dust recovery bag 30 performs secondary dust recovery, and the primary dust recovery of the dust removal bag 5 and the secondary dust recovery of the dust recovery bag 30 ensure that the dust is effectively treated and more accurately.

[0046] As shown in Figure 1 A condenser 31 is arranged on the condensing member, the front end of the condenser 31 is communicated with the air return pipe 28, the rear end of the condenser 31 is respectively provided with an alcohol pipe 32 and an air suction pipe 33, an air suction machine 34 is arranged on the air suction pipe 33, the evaporated alcohol is sucked into the condenser 31 by opening the air suction machine 34, and the alcohol is collected in the condenser 31 after passing through the air filter 26, so that the alcohol is reused and energy consumption is reduced.

[0047] The use method of the soft magnetic powder coating equipment includes the following steps:

[0048] (1) The stirring motor 7 is opened, the frequency of the stirring motor 7 is 20 Hz, the soft magnetic powder is added from the first feeding end 4, the first valve 9 is closed, the second valve 10 is opened, the coating material dispersion liquid and alcohol are added from the second feeding end 6, the second valve 10 is closed, the sixth valve 25 on the heat exchanger 2 is opened, the reaction kettle 1 is heated to 95 DEG C, and the mixed material is obtained after stirring for 15 min, the third valve 11 is opened, the mixed material enters the pressurized bin 12, and the third valve 11 is closed.

[0049] (2) start the high-speed spraying motor 19, open the fifth valve 16 on the compressed air pipe 13 (air pressure is 0.8 MPa), open the discharge valve 18, after 30 minutes, the mixed material is thrown out through the spraying port 22 into the reaction 1 kettle under the high-speed inertia, dried for 2s in the reaction kettle 1, the evaporated alcohol is recovered by the condenser 31 after passing through the air filter 26, and the dried coated soft magnetic powder is collected after the collection valve 24 is opened.

[0050] It should be noted that all directional indications, such as upper, lower, left, right, front, back, and the like, are only used to explain the relative position relationship, movement condition and the like between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0051] In addition, the descriptions such as "first", "second", "one" and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0052] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection required by the present application.

Claims

1. A soft magnetic powder coating device, characterized in that, include: A reaction vessel, wherein a heat exchanger is provided on the lower side wall of the reaction vessel; A stirring assembly is disposed at the upper end of the reaction vessel. The stirring assembly is provided with a stirring chamber. A first feeding end is provided at the upper end of the stirring chamber. The first feeding end is used to feed soft magnetic powder. Dust removal bags and second feeding ends are respectively disposed on both sides of the upper part of the stirring chamber. The second feeding end is used to feed insulating auxiliary materials and alcohol. An alcohol recovery assembly is disposed on the upper side wall of the reactor. The alcohol recovery assembly is provided with a filter element and a condenser element. The front end of the filter element is disposed on the upper side wall of the reactor, and the condenser element is connected to the rear end of the filter element. Alcohol enters the condenser element through the filter element. While the mixing chamber is being fed and stirred through the first and second feed ends, the heat exchanger is opened. The dust collection bag can absorb the dust in the mixing chamber. When the soft magnetic powder flows to the reaction vessel after being coated, the condenser can recover the evaporated alcohol. A stirring motor is provided on the side wall of the mixing chamber, and a stirring blade is provided at the output end of the stirring motor. A first valve is provided at the first feed end, a second valve is provided at the second feed end, and a third valve is provided at the lower part of the mixing chamber. The lower end of the mixing chamber is connected to a pressurization chamber. Compressed air pipes and alcohol cleaning pipes are respectively installed on both sides of the pressurization chamber. A fourth valve is installed on the alcohol cleaning pipe and a fifth valve is installed on the compressed air pipe. A discharge pipe is installed at the lower part of the pressurization chamber and is connected to the upper part of the reaction vessel. A discharge valve is installed on the discharge pipe. A high-speed spray motor is installed at the upper end of the reactor. A rotating rod is installed at the output end of the high-speed spray motor. A connecting pipe is sleeved on the rotating rod. The upper part of the connecting pipe is connected to the high-speed spray motor. A gap is opened between the rotating rod and the connecting pipe. The lower end of the discharge pipe passes through the connecting pipe and is located within the gap. A spray nozzle is rotatably installed at the lower end of the rotating rod. A receiving end is installed at the lower end of the reactor. A receiving valve is installed on the receiving end. A sixth valve is installed at the connection between the reactor and the heat exchanger.

2. The soft magnetic powder coating equipment according to claim 1, characterized in that, The filter element includes an air filter, one side of which is connected to a flow pipe that communicates with the upper side wall of the reactor. The other side of the air filter is connected to a return air pipe. The condenser is connected to the end of the return air pipe. A seventh valve is installed on the return air pipe. A dust collection bag is installed at the lower end of the air filter.

3. The soft magnetic powder coating equipment according to claim 2, characterized in that, The condenser is provided with a condenser, the front end of which is connected to the return air duct, and the rear end of the condenser is provided with an alcohol pipe and an exhaust pipe, and an exhaust fan is provided on the exhaust pipe.

4. A soft magnetic powder coating process, characterized in that, The soft magnetic powder coating equipment as described in claim 3 is used.

5. The soft magnetic powder coating process according to claim 4, characterized in that, Includes the following steps: (1) Turn on the stirring motor, add soft magnetic powder from the first feed end, close the first valve, open the second valve, add the coating material dispersion and cleaning liquid from the second feed end, close the second valve, open the sixth valve on the heat exchanger to heat the reactor, stir to obtain a mixture, open the third valve to allow the mixture to enter the pressurization chamber, and close the third valve; (2) Turn on the high-speed spray motor, open the fifth valve on the compressed air pipe, open the discharge valve, and the mixture enters the reactor through the spray nozzle for drying. The cleaning liquid is recovered by the condenser after passing through the air filter. After the receiving valve is opened, the dried coated soft magnetic powder is collected.

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