An apparatus for producing a magnetic metal powder

Abstract

The application discloses a kind of preparation devices of magnetic metal powder, including melting furnace, powder generation tank, powder collection tank, atomization furnace, vacuum pump, atomization medium delivery pipe;The atomization furnace is arranged in powder generation tank, and the top of powder generation tank is connected with the melting furnace, and the bottom of powder generation tank is connected with the powder collection tank;The melting furnace is used to melt magnetic metal material into magnetic liquid metal and inject magnetic liquid metal into the atomization furnace;The atomization medium delivery pipe is communicated with the atomization furnace, for injecting atomization medium into the atomization furnace;The powder collection tank is used to collect the magnetic metal powder output by the atomization furnace;The vacuum pump is communicated with the powder generation tank by pipeline, for extracting gas to balance the air pressure in the powder generation tank.The beneficial effects of the present application are to improve the efficiency of preparation.

Description

Technical Field

[0001] This invention relates to a preparation apparatus, particularly an apparatus for preparing magnetic metal powder. Background Technology

[0002] Currently, in the field of metal powder preparation technology, a commonly used method is to use an atomizing medium to disperse, atomize, and then cool and solidify a jet of molten metal into metal powder. Metal powders obtained using this method have good sphericity and superior physical properties.

[0003] For example, the invention patent with prior art publication number CN107262730B discloses a gas atomization preparation method and equipment for micro-spherical metal powder. In this invention patent, the lower end of the guide nozzle is surrounded by an annular slit or annular hole atomizer. The metal liquid is sprayed out from the lower end of the guide nozzle to form a metal liquid jet. The atomizer sprays a high-speed airflow to atomize and cool the metal liquid jet to form metal powder.

[0004] This invention patent has the following defects: The atomizing canister has a large internal space, leading to significant dispersion of the metal powder and low collection efficiency. Furthermore, a cyclone separator is necessary to collect the scattered metal powder. During final powder collection, the metal powder from both the powder collector and the cyclone separator must be combined, further contributing to the poor efficiency. Additionally, the low contact efficiency between the liquid metal jet and the atomizing medium (high-speed airflow) prevents the atomizing medium from adequately impacting and dispersing the liquid metal jet, resulting in low particle size uniformity of the atomized metal droplets and consequently, low particle size uniformity of the final metal powder. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an apparatus for preparing magnetic metal powder, thereby improving the preparation efficiency.

[0006] The present invention is achieved through the following technical solution.

[0007] An apparatus for preparing magnetic metal powder includes a melting furnace, a powder generating tank, a powder collecting tank, an atomizing furnace, a vacuum pump, and an atomizing medium delivery pipe. The atomizing furnace is disposed inside the powder generating tank, the melting furnace is connected to the top of the powder generating tank, and the powder collecting tank is connected to the bottom of the powder generating tank. The melting furnace is used to melt magnetic metal materials into magnetic liquid metal and spray the magnetic liquid metal into the atomizing furnace. The atomizing medium delivery pipe is connected to the atomizing furnace and is used to spray the atomizing medium into the atomizing furnace. The powder collecting tank is used to collect the magnetic metal powder output from the atomizing furnace. The vacuum pump is connected to the powder generating tank through a pipeline and is used to extract gas to balance the gas pressure inside the powder generating tank.

[0008] As a further improvement of the present invention, the atomizing furnace has an atomizing section for atomizing magnetic liquid metal and a discharge section connected to the bottom of the atomizing section for discharging magnetic metal powder; the bottom of the discharge section has an opening, and its diameter gradually decreases from top to bottom.

[0009] As a further improvement of the present invention, the vacuum pump forms multiple extraction points on the side of the powder generating tank through pipelines. The multiple extraction points are located in the upper middle part of the side of the powder generating tank and are circumferentially spaced apart. The powder generating tank has a tapering structure with a diameter that gradually decreases from top to bottom for the discharge part of the atomizing furnace. The bottom of the tapering structure is connected to the powder collecting tank. The inner wall of the tapering structure and the outer wall of the discharge part are spaced apart, and an airflow channel is formed between them.

[0010] As a further improvement of the present invention, a magnetic adsorber is provided at the bottom of the powder collection tank to draw the magnetic metal powder output from the discharge section into the powder collection tank.

[0011] As a further improvement of the present invention, the magnetic adsorber is configured as an electromagnet chuck.

[0012] As a further improvement of the present invention, a layer of felt is provided on the inner wall of the powder collection tank to capture part of the magnetic metal powder carried by the airflow flowing toward the extraction point.

[0013] As a further improvement of the present invention, a flow guiding structure is provided between the melting furnace and the powder generating tank. The flow guiding structure has multiple flow guiding holes arranged in a ring and connecting the melting furnace and the atomizing furnace, so that magnetic liquid metal is injected from the melting chamber into the atomizing chamber and forms a magnetic metal liquid jet band. The atomizing medium conveyed by the atomizing medium conveying pipe to the atomizing furnace is injected from the periphery of the magnetic metal liquid jet band inward and from the inner periphery outward.

[0014] As a further improvement of the present invention, the atomizing furnace forms a plurality of circumferentially arranged first spray units and a plurality of circumferentially arranged second spray units on the inner and outer sides of the upstream of the magnetic metal liquid jet band. The atomizing medium ejected by the first spray unit forms a first atomizing medium vortex, and the atomizing medium ejected by the second spray unit forms a second atomizing medium vortex. The rotation directions of the first atomizing medium vortex and the second atomizing medium vortex are opposite. The atomizing furnace forms a plurality of circumferentially arranged third spray units and a plurality of circumferentially arranged fourth spray units on the inner and outer sides of the downstream of the magnetic metal liquid jet band. The atomizing medium ejected by the third spray unit forms a third atomizing medium vortex, and the atomizing medium ejected by the fourth spray unit forms a fourth atomizing medium vortex. The rotation directions of the third atomizing medium vortex and the fourth atomizing medium vortex are the same.

[0015] As a further improvement of the present invention, the atomizing furnace includes an inner cylinder, a middle cylinder, and an outer cylinder; the space between the inner cylinder and the middle cylinder forms an atomizing space for atomizing a magnetic metal liquid jet band; the space inside the inner cylinder and the space between the middle cylinder and the outer cylinder are used to transport the atomizing medium; the first spray unit and the third spray unit are disposed on the outer wall of the inner cylinder, and the second spray unit and the fourth spray unit are disposed on the inner wall of the middle cylinder.

[0016] As a further improvement of the present invention, the outer cylinder is longer than the inner cylinder and the middle cylinder, and the corresponding parts of the outer cylinder, the middle cylinder and the inner cylinder form the outer shell of the atomizing part, and the remaining parts form the outer shell of the discharging part.

[0017] The beneficial effects of this invention are: The change in the diameter of the discharge section causes the width of the discharge channel to gradually decrease, which makes the magnetic metal powder output by the discharge section more concentrated and avoids the magnetic metal powder from scattering, thus improving the collection efficiency of magnetic metal powder. Increasing the flow velocity of the atomizing medium in the airflow channel k creates a strong negative pressure environment, which draws the magnetic metal powder from the bottom of the discharge section. Furthermore, the structure of the discharge section with its gradually decreasing diameter from top to bottom further improves the efficiency of collecting the magnetic metal powder. The magnetic adsorption device can prevent some magnetic metal powder from being drawn into the vacuum pump with the airflow, thus improving the collection efficiency. Attached Figure Description

[0018] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings to aid in understanding the objectives and advantages of the present invention, wherein: Figure 1 A cross-sectional view of the apparatus for preparing magnetic metal powder from a frontal view. Figure 2 This is a cross-sectional view of the first atomizing mechanism from a top-down perspective; Figure 3 This is a cross-sectional view of the second atomizing mechanism from a top-down perspective; Figure 4 for Figure 1 A magnified view of a portion of the image. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0020] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0021] Reference Figure 1-4 A magnetic metal powder preparation apparatus includes a melting furnace 1, an atomizing furnace 2, a flow guiding structure 3, a powder generating tank 6, a powder collecting tank 7, a vacuum pump 8, and an atomizing medium conveying pipe.

[0022] The atomizing furnace 2 is located inside the powder generating tank 6, the melting furnace 2 is connected to the top of the powder generating tank 6, and the powder collecting tank 7 is connected to the bottom of the powder generating tank 6. The melting furnace 1 is used to melt magnetic metal materials into magnetic liquid metal, store the magnetic liquid metal, and keep it at a constant temperature to maintain its liquid state. It can consist of a melting crucible for melting the magnetic metal materials, a heat-insulating crucible for storing the magnetic liquid metal, and a high-temperature resistant pipe connecting the melting crucible and the heat-insulating crucible. The heat-insulating crucible can be equipped with a heating coil to improve the heat preservation effect. The melting furnace 1 sprays the magnetic liquid metal into the atomizing furnace 2, and the atomizing medium delivery pipe sprays the atomizing medium into the atomizing furnace 2. The atomizing furnace 2 provides a space where the magnetic liquid metal is atomized into metal droplets and gradually cools and solidifies to form magnetic metal powder. The magnetic metal powder is output from the bottom of the atomizing furnace 2 and is eventually collected in the powder collecting tank 7. During this atomization process, the vacuum pump 8 is connected to the powder generating tank 6 through a pipeline, and extracts the atomizing medium gas in the powder generating tank 6. That is, the atomizing medium delivery pipe inputs gas into the powder generating tank 6, and the vacuum pump 8 extracts the gas in the powder generating tank 6, thereby balancing the gas pressure in the powder generating tank 6.

[0023] In this embodiment, the atomizing furnace 2 has an atomizing section 2-1 for atomizing magnetic liquid metal and a discharge section 2-2 connected to the bottom of the atomizing section 2-1 for outputting magnetic metal powder. The bottom of the discharge section 2-2 has an opening, and its diameter gradually decreases from top to bottom. The change in the diameter of the discharge section 2-2 causes the width of the discharge channel of the discharge section 2-2 to gradually decrease, thereby making the magnetic metal powder output by the discharge section 2-2 more concentrated and avoiding the magnetic metal powder from scattering, which is beneficial to improving the collection efficiency of magnetic metal powder.

[0024] In this embodiment, the vacuum pump 8 forms multiple extraction points 81 on the side of the powder generating tank 6 through pipelines. These extraction points are located in the upper-middle part of the side of the powder generating tank 6 and are circumferentially spaced. The powder generating tank 6 has a tapering structure 61 with a gradually decreasing diameter from top to bottom relative to the discharge section 2-2 of the atomizing furnace. The bottom of the tapering structure 61 is connected to the powder collecting tank 7. The inner wall of the tapering structure 61 and the outer wall of the discharge section 2-2 are spaced apart, forming an airflow channel k between them. Aligning the tapering structure 61 of the powder generating tank 6 with the discharge section 2-2 reduces the gap between the powder generating tank 6 and the atomizing furnace, thereby reducing the width of the airflow channel k and increasing the flow velocity of the atomizing medium in the airflow channel k. This creates a strong negative pressure environment, drawing the magnetic metal powder from the bottom of the discharge section 2-2 within the atomizing furnace. Furthermore, the gradually decreasing diameter structure of the discharge section 2-2 further improves the efficiency of collecting the magnetic metal powder.

[0025] The condensation structure 61 of the powder generating tank 6 improves the pumping efficiency. However, the pumping will cause some magnetic metal powder to be drawn into the vacuum pump 8 with the airflow. This will result in a loss in the amount of magnetic metal powder collected and will also have an adverse effect on the vacuum pump 8, or even damage it.

[0026] Based on this, in this embodiment, a magnetic adsorber 71 is provided at the bottom of the powder collection tank 7 to draw the magnetic metal powder output from the discharge section 2-2 into the powder collection tank 7, thereby preventing the metal powder from flowing to the extraction point 81 through the airflow channel k and being drawn into the vacuum pump 8.

[0027] In this embodiment, the magnetic chuck 71 is set as an electromagnet chuck. When the magnetic metal powder preparation device is in operation, the electromagnet chuck is energized to form an adsorption force on the magnetic metal powder. When the magnetic metal powder preparation device is stopped, the electromagnet chuck is energized and de-energized, thus releasing the adsorption force on the magnetic metal powder. The powder collection tank 7 is then removed from the bottom of the powder generation tank 6, and the metal powder in the powder collection tank 7 is poured into the storage device.

[0028] When the vacuum pump 8 has a high power, the flow intensity of the airflow will to some extent offset the magnetic adsorption force of the magnetic adsorption device on the magnetic metal powder, and a small part of the magnetic metal powder will still flow out with the airflow. Therefore, in this embodiment, a layer of felt 72 is provided on the inner wall of the powder collection tank 7 to capture some of the magnetic metal powder carried by the airflow flowing towards the pumping point. When the magnetic metal powder preparation device is shut down, the electromagnet chuck is kept energized for a period of time so that the magnetic metal powder on the felt 72 is sucked down and falls off, and then the power is turned off.

[0029] In this embodiment, a flow guiding structure 3 is provided between the melting furnace 2 and the powder generating tank 6. The flow guiding structure 3 has multiple annularly distributed flow guiding holes 31 that connect the melting furnace 1 and the atomizing furnace 2, allowing magnetic liquid metal to be injected from the melting chamber into the atomizing chamber and form a metal liquid jet band p. The atomizing medium conveyed to the atomizing furnace 2 by the atomizing medium delivery pipe is injected from the outer periphery of the magnetic metal liquid jet band p inward and from the inner periphery outward. The magnetic metal liquid jet band p presents an annular strip-shaped flowing liquid in its overall shape. Compared with a columnar jet, the metal liquid jet band p has a larger inner "surface" and outer "surface" that can contact the atomizing medium. The injection of the atomizing medium from the outer periphery inward and from the inner periphery outward of the magnetic metal liquid jet band p can improve the efficiency of contact and atomization with the atomizing medium, thereby significantly improving the atomization effect.

[0030] In this embodiment, the atomizing furnace 2 forms multiple surrounding first spray units a and multiple surrounding second spray units b on the inner and outer sides of the magnetic liquid metal jet belt p upstream. The first spray units a spray the atomizing medium inward from the outer periphery of the liquid metal jet belt p, and the second spray units b spray the atomizing medium outward from the inner periphery of the liquid metal jet belt p. The atomizing furnace 2 also forms multiple surrounding third spray units c and multiple fourth spray units d on the inner and outer sides of the magnetic liquid metal jet belt p downstream. The third spray units c spray the atomizing medium inward from the outer periphery of the liquid metal jet belt p, and the fourth spray units d spray the atomizing medium outward from the inner periphery of the liquid metal jet belt p.

[0031] The atomized medium ejected by the first injection unit a forms a first atomized medium vortex, and the atomized medium ejected by the second injection unit b forms a second atomized medium vortex. The first and second atomized medium vortices rotate in opposite directions. The atomized medium ejected by the third injection unit c forms a third atomized medium vortex, and the atomized medium ejected by the fourth injection unit d forms a fourth atomized medium vortex. The third and fourth atomized medium vortices rotate in the same direction.

[0032] In this embodiment, because the first and second atomizing medium vortices rotate in opposite directions, turbulence is formed, and they come into contact with the magnetic liquid metal. Similarly, because the third and fourth atomizing medium vortices rotate in the same direction, eddies are formed, and they also come into contact with the magnetic liquid metal. This results in the formation of a first atomizing mechanism for generating turbulence and a second atomizing mechanism for generating eddies within the melting furnace 2, with the first atomizing mechanism positioned above the second atomizing mechanism. This ensures that the magnetic metal liquid jet p first contacts the turbulence and then the eddies. Under the influence of turbulence, the magnetic liquid metal jet (p) is sufficiently impacted and atomized, forming metal droplets. This improves the efficiency of contact and atomization with the atomizing medium. The magnetic liquid metal jet (p) not only exhibits excellent dispersion in turbulence, but the turbulence also repeatedly disperses larger metal droplets and increases the frequency of collisions between droplets, resulting in smaller droplets. These droplets gradually cool and form magnetic metal powder, resulting in a final magnetic metal powder with higher particle size uniformity and smaller particle size. The highly uniform and small-sized metal droplets formed under turbulence are then further amplified by eddies. These eddies relatively reduce the frequency of collisions between droplets and increase the frequency of contact with the atomizing medium, accelerating the rate at which the droplets cool and solidify into magnetic metal powder.

[0033] In this embodiment, the injection direction of the first injection unit a is adapted to form a first atomized medium vortex, and the injection direction of the second injection unit b is adapted to form a second atomized medium vortex. The rotation directions of the first and second atomized medium vortices are opposite. The injection directions of each first injection unit a are symmetrically arranged about the central axis of the metal liquid jet band p, and the injection directions of each second injection unit b are symmetrically arranged about the central axis of the metal liquid jet band p. The injection direction of the third injection unit c is adapted to form a third atomized medium vortex, and the injection direction of the fourth injection unit d is adapted to form a fourth atomized medium vortex. The rotation directions of the third and fourth atomized medium vortices are the same, and the injection directions of each third injection unit c and each fourth injection unit d are symmetrically arranged about the central axis of the metal liquid jet band p.

[0034] In this embodiment, the spray directions r of the first spray unit a, the second spray unit b, the third spray unit c, and the fourth spray unit d are orthogonally decomposed into a first spray direction r1 along the spray direction of the magnetic liquid metal and a second spray direction r2 that forms vortices. The first spray direction r1 allows the turbulence and vortices to not only act on the metal liquid jet band p, but also to assist in propelling the flow of the metal liquid jet band p, thereby improving the overall atomization efficiency. As for the second spray direction r2, as... Figure 2 , 3 As shown, the second jet direction r2 of the first jet unit a is clockwise, and the second jet direction r2 of the second jet unit b is counterclockwise. These opposite directions create turbulence. It's important to note that the overall jet intensity of the first jet unit a and the second jet unit b are approximately the same to balance the resulting turbulence. Similarly, the second jet direction r2 of the third jet unit c and the fourth jet unit d are clockwise, creating vortices. Again, it's important to note that the overall jet intensity of the third jet unit c and the fourth jet unit d are approximately the same to balance the resulting vortices.

[0035] More specifically regarding the internal structure of the atomizing furnace 2, the atomizing furnace 2 is provided with an inner cylinder 21, a middle cylinder 22, and an outer cylinder 23. The space between the inner cylinder 21 and the middle cylinder 22 forms an atomizing space s for atomizing the metal liquid jet p. The space inside the inner cylinder 21 and the space between the middle cylinder 22 and the outer cylinder 23 are used to transport the atomizing medium. The first spray unit a and the third spray unit c are provided on the outer wall of the inner cylinder 21, and the second spray unit b and the fourth spray unit d are provided on the inner wall of the middle cylinder 22.

[0036] The outer cylinder 23 is longer than the inner cylinder 21 and the middle cylinder 22. The corresponding parts of the outer cylinder 23, the middle cylinder 22 and the inner cylinder 21 form the outer shell of the atomizing part 2-1, and the remaining parts form the outer shell of the discharge part 2-2.

[0037] The atomizing medium delivery pipe includes a first delivery pipe 41 and a second delivery pipe 42. The inner cylinder 21 is connected to the first delivery pipe 41. Multiple through holes are formed on the inner cylinder 21. The through holes at the upper position form the first injection unit a, and the through holes at the lower position form the third injection unit c. The outer cylinder 23 is connected to the second delivery pipe 42. Multiple through holes are formed on the middle cylinder 22. The through holes at the upper position form the second injection unit b, and the through holes at the lower position form the fourth injection unit d.

[0038] It should be noted that a partition 24 is provided between the middle cylinder 22 and the outer cylinder 23, dividing the space into a first space s1 and a second space s2. The second injection unit b corresponds to the first space s1, and the fourth injection unit d corresponds to the second space s2. A heating structure 51 for heating the atomizing medium is provided in the first space s1, and a cooling structure 52 for cooling the atomizing medium is provided in the second space s2. The second delivery pipe 42 forms a branch pipe, which connects the first space s1 and the second space s2 respectively.

[0039] By setting up a heating structure 51, the atomized medium sprayed by the second spray unit b is heated, so that under the action of turbulence, the metal droplets in the liquid metal jet p do not cool and solidify into solid particles, but remain in a liquid particle state, thus resulting in higher uniformity and smaller particle size of the metal droplets. By setting up a cooling mechanism, the atomized medium sprayed by the fourth spray unit d is cooled, so that the highly uniform and smaller metal droplets gradually cool and solidify into magnetic metal powder under the action of eddies, avoiding the formation of large particles with attached satellite particles.

[0040] In this embodiment, the heating structure 51 is configured as an electric heating wire coiled and arranged in the first space s1. The motor heating wire needs to cover the entire first space s1 as much as possible to improve the heating effect.

[0041] In this embodiment, the cooling structure 52 is configured as a refrigerant pipe coiled in the second space s2, and a cooling medium flows through the refrigerant pipe. The cooling medium can be a gaseous medium or a liquid medium. The refrigerant pipe needs to cover the entire second space s2 as much as possible to improve the cooling effect.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An apparatus for preparing magnetic metal powder, characterized in that, The system includes a melting furnace, a powder generating tank, a powder collecting tank, an atomizing furnace, a vacuum pump, and an atomizing medium delivery pipe. The atomizing furnace is located inside the powder generating tank, the melting furnace is connected to the top of the powder generating tank, and the powder collecting tank is connected to the bottom of the powder generating tank. The melting furnace is used to melt magnetic metal materials into magnetic liquid metal and spray the magnetic liquid metal into the atomizing furnace. The atomizing medium delivery pipe is connected to the atomizing furnace and is used to spray the atomizing medium into the atomizing furnace. The powder collecting tank is used to collect the magnetic metal powder output from the atomizing furnace. The vacuum pump is connected to the powder generating tank through a pipeline and is used to extract gas to balance the gas pressure inside the powder generating tank. The atomizing furnace has an atomizing section for atomizing magnetic liquid metal and a discharge section connected to the bottom of the atomizing section for outputting magnetic metal powder; the bottom of the discharge section has an opening, and its diameter gradually decreases from top to bottom. The vacuum pump forms multiple extraction points on the side of the powder generating tank through pipelines. The multiple extraction points are located in the upper middle part of the side of the powder generating tank and are circumferentially spaced apart. The powder generating tank has a tapering structure with the diameter gradually decreasing from top to bottom for the discharge part of the atomizing furnace. The bottom of the tapering structure is connected to the powder collecting tank. The inner wall of the tapering structure and the outer wall of the discharge part are spaced apart, and an airflow channel is formed between them. A flow guiding structure is provided between the melting furnace and the powder generating tank. The flow guiding structure has multiple flow guiding holes arranged in a ring and connecting the melting furnace and the atomizing furnace, so that magnetic liquid metal is injected from the melting chamber into the atomizing chamber and forms a magnetic metal liquid jet band. The atomizing medium conveyed by the atomizing medium conveying pipe to the atomizing furnace is injected from the outer periphery of the magnetic metal liquid jet band inward and from the inner periphery outward. The atomizing furnace forms multiple first spray units and multiple second spray units arranged in a ring on the inner and outer sides upstream of the magnetic metal liquid jet band. The atomized medium ejected by the first spray unit forms a first atomized medium vortex, and the atomized medium ejected by the second spray unit forms a second atomized medium vortex. The rotation directions of the first and second atomized medium vortices are opposite. The atomizing furnace also forms multiple third spray units and multiple fourth spray units arranged in a ring on the inner and outer sides downstream of the magnetic metal liquid jet band. The atomized medium ejected by the third spray unit forms a third atomized medium vortex, and the atomized medium ejected by the fourth spray unit forms a fourth atomized medium vortex. The rotation directions of the third and fourth atomized medium vortices are the same. The atomizing furnace includes an inner cylinder, a middle cylinder, and an outer cylinder; the space between the inner cylinder and the middle cylinder forms an atomizing space for atomizing a magnetic metal liquid jet band; the space inside the inner cylinder and the space between the middle cylinder and the outer cylinder are used to transport the atomizing medium; the first spray unit and the third spray unit are disposed on the outer wall of the inner cylinder, and the second spray unit and the fourth spray unit are disposed on the inner wall of the middle cylinder.

2. The apparatus for preparing magnetic metal powder according to claim 1, characterized in that, The bottom of the powder collection tank is equipped with a magnetic adsorber, which is used to draw the magnetic metal powder output from the discharge section into the powder collection tank.

3. The apparatus for preparing magnetic metal powder according to claim 2, characterized in that, The magnetic suction device is configured as an electromagnet chuck.

4. The apparatus for preparing magnetic metal powder according to claim 2, characterized in that, A layer of felt is provided on the inner wall of the powder collection tank to capture some of the magnetic metal powder carried by the airflow flowing towards the extraction point.

5. The apparatus for preparing magnetic metal powder according to claim 1, characterized in that, The outer cylinder is longer than the inner and middle cylinders. The corresponding parts of the outer cylinder, middle cylinder, and inner cylinder form the outer shell of the atomizing part, and the remaining parts form the outer shell of the discharging part.

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