A nano metal powder preparation micron powder particle size control device

Abstract

The application provides a kind of nano metal powder preparation micron powder particle size control equipment, belongs to the technical field of preparation magnetic material powder, the device includes ultrasonic atomization mechanism, high temperature pyrolysis mechanism and product collection mechanism, the atomization pool is divided into two groups of independent subarea pool by atomization partition, two areas are respectively configured with variable frequency ultrasonic assembly, can synchronously generate nanometer, micron two kinds of atomized droplets, without the need of back-end multistage airflow classification device, also without the need of configuring two sets of independent atomization tank and supporting liquid supply, carrier gas system;It simplifies the whole machine structure, reduces the equipment occupation, reduces production cost, sets up buffer assembly between circulating pool and atomization subarea pool, forms controllable flow channel by relying on liftable elastic eardrum, realizes circulating pool and subarea pool solution intercommunication, guarantees solute concentration uniformity, avoids precipitation;Again, it can block the ripple, turbulence generated by circulating pipeline from directly impacting atomization area, eliminate the disturbance of liquid level fluctuation to ultrasonic atomization working condition.

Description

Technical Field

[0001] This invention relates to the field of magnetic material powder preparation technology, and in particular to a device for controlling the particle size of nano-metal powders. Background Technology

[0002] Metal micro / nano powders have irreplaceable application value in additive manufacturing, electronic conductive pastes, catalysis, and magnetic functional materials. The industry often requires micron-sized metal powders with specific particle size ranges, using nano-metal precursor particles as raw materials. Currently, the mainstream approach is to use an integrated ultrasonic atomization-high-temperature pyrolysis device for continuous preparation of micro / nano powders. Prior art document CN119407191B discloses a micro / nano powder production device that combines ultrasonic atomization, segmented tubular pyrolysis, and electrostatic-magnetic field synergistic collection. This device can achieve efficient atomization, pyrolysis, and powder recovery of metal salt solutions, but some technical shortcomings still exist in actual production and use.

[0003] First, existing atomizing tanks use a single internal cavity structure, with all ultrasonic transducers sharing the same driving frequency. This only allows the generation of atomized droplets within a single particle size range, making it impossible to simultaneously produce both nano- and micron-sized precursor droplets. To obtain composite powders of nanoparticles and micron-sized agglomerates, multi-stage airflow classification and sorting at the back end is necessary. This not only increases the overall equipment size and cost but also results in significant loss of fine nanoparticles, leading to a low powder yield. If two independent atomizing tanks are used to prepare droplets of different particle sizes separately, two sets of liquid supply, liquid control, and carrier gas delivery systems are required, resulting in cumbersome equipment structures and large space requirements.

[0004] Secondly, existing shallow liquid surface atomizing tanks lack partitioning and buffering flow stabilization structures. To ensure stable ultrasonic atomization, the liquid level in the tank is usually controlled at an ultra-shallow height of 0.2-1cm. The equipment relies on external circulation pipelines to achieve solution anti-sedimentation circulation. However, the water ripples and turbulence generated by the circulation flow are directly transmitted to the atomization area, causing fluctuations in the liquid surface of the atomization tank. The atomization conditions of the ultrasonic transducer change continuously, resulting in a wide particle size distribution and poor batch consistency of the final powder. At the same time, the liquid in the circulation zone and the atomization zone are completely connected. The liquid level difference forms a unidirectional continuous water flow that impacts the atomizing membrane, which easily causes solute accumulation and scaling on the membrane surface. The atomization efficiency continues to decline over long-term operation. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a device for controlling the particle size of nano-metal powders to prepare micron-sized powders, thereby resolving the problems existing in the prior art.

[0006] According to the present invention, a device for controlling the particle size of nano-metal powder in the preparation of micron-sized powder is provided, characterized in that it includes an ultrasonic atomization mechanism, a high-temperature pyrolysis mechanism, and a product collection mechanism; the discharge end of the ultrasonic atomization mechanism is connected to the feed end of the high-temperature pyrolysis mechanism, and the discharge end of the high-temperature pyrolysis mechanism is connected to the feed end of the product collection mechanism. The ultrasonic atomizing mechanism includes a tank, a load-bearing component, an ultrasonic component, a buffer component, a mounting rod, a liquid level sensor one, and a liquid level sensor two. The supporting component is located at the bottom of the tank and has an integral spoon-shaped structure. It is internally connected to a shallow liquid atomizing tank and a large-capacity circulation tank. The circulation tank is equipped with a feed pipe and a drain pipe. The atomizing tank is equipped with an atomizing baffle to separate two groups of partitioned tanks. The bottom of each partitioned tank is equipped with an installation through hole and an installation through groove. The circulation tank is equipped with a circulation baffle and a circulation component for preventing sedimentation during solution circulation. An ultrasonic component capable of producing droplets of different particle sizes is installed at the mounting through hole. A buffer component is provided in the mounting through groove. The buffer component is used to block the water flow ripples in the circulating pool from disturbing the atomization zone and to maintain limited interconnection between the partitioned pool and the circulating pool. Each zone pool is equipped with a flow hood, and a liquid level sensor 1 and a liquid level sensor 2 are respectively mounted on the mounting rod. The liquid level sensor 1 serves as a reference linkage buffer component to adjust the flow height and ensure that the liquid levels on both sides are equal. The flow hood is connected to the high-temperature pyrolysis mechanism through a flow pipe. The high-temperature pyrolysis mechanism is a segmented temperature-controlled tube furnace, used for dehydrating and pyrolyzing atomized droplets and agglomerating nanoparticles to form target micron-sized metal powder. The product collection mechanism completes the graded collection of micro-nano powders through electrostatic and magnetic field synergistic adsorption.

[0007] As a further aspect of the present invention: the circulation assembly includes circulation pipe one, circulation pump one, circulation pipe two, and circulation pump two; circulation pipe one and circulation pipe two are respectively embedded on both sides of the circulation partition, and circulation pump one and circulation pump two are respectively installed on circulation pipe one and circulation pipe two.

[0008] As a further embodiment of the present invention: the ultrasonic component includes a high-transmission diaphragm, a frequency-converting ultrasonic transducer, and a mounting cover; the lower end of the mounting through hole is provided with an embedded stepped groove and a connecting ring, the high-transmission diaphragm and the frequency-converting ultrasonic transducer are stacked and installed into the stepped groove, and the mounting cover and the connecting ring are threadedly locked and sealed.

[0009] According to the nano-metal powder preparation micron-sized powder particle size control device as described in the claim, the variable frequency ultrasonic transducers in the two-component partitioned pool adopt two working frequencies, high frequency and low frequency, respectively, to simultaneously produce nano-sized and micron-sized atomized droplets.

[0010] As a further aspect of the present invention: the buffer assembly includes a main frame, the main frame being square in shape and matching the size of a square mounting slot; an mounting frame is fixedly connected to the upper end of the main frame, and a square elastic diaphragm is fixedly connected to the mounting frame, the elastic diaphragm having an integrally formed protruding edge around its perimeter, the protruding edge being sealed and fixed to the upper end of the mounting frame.

[0011] As a further embodiment of the present invention: a support frame is fixedly connected to the lower end of the main frame, an electric push rod is vertically installed on the top surface of the support frame, a telescopic rod is connected to the upward-facing drive end of the electric push rod, a long top rod is fixedly connected to the top of the telescopic rod, and the top surface of the top rod abuts against, supports and is fixedly connected to the center of the bottom surface of the elastic tympanic membrane.

[0012] As a further aspect of the present invention: the tubular furnace of the high-temperature pyrolysis mechanism is divided into three temperature control zones along the material flow direction, with the length ratio of the three temperature zones being 1-2:1:1, and the working temperatures of the three temperature zones being 300-400℃, 700-800℃, and 800-1000℃ respectively. An airflow rectifier core is installed inside the furnace to balance the airflow.

[0013] As a further aspect of the present invention: the product collection mechanism includes a physical separation component, an electrostatic collection component, and a magnetic field adsorption device; the physical separation component is a cyclone separator, and the physical separation component is connected to the electrostatic collection component; the electrostatic collection component includes a positive electrode electric field arrangement structure and a cylindrical negative electrode electric field arrangement structure arranged coaxially; the magnetic field adsorption device is wrapped around the outer wall of the negative electrode electric field arrangement structure, and the magnetic field strength is adjustable in the range of 0.01-0.2T.

[0014] As a further aspect of the present invention: the positive electrode electric field arrangement structure includes a main trunk and multiple positive electrode sheets arranged along the axis of the main trunk, and the edges of the positive electrode sheets are provided with a serrated structure to enhance the electric field adsorption capacity.

[0015] The beneficial effects of this invention are: 1. This invention divides the atomization pool into two independent partitioned pools using an atomization baffle. Each partition is equipped with a variable frequency ultrasonic component, which can simultaneously generate two types of atomized droplets: nano-sized and micro-sized. This eliminates the need for a multi-stage airflow classification device at the back end, as well as two independent atomization tanks and supporting liquid supply and carrier gas systems. This simplifies the overall structure, reduces equipment footprint, lowers production costs, reduces nanoparticle sorting losses, effectively improves the overall powder yield, and allows for flexible control of the mixing ratio of nano- and micro-sized powders to precisely prepare composite micro-sized metal powders with target particle sizes.

[0016] 2. This invention incorporates a buffer component between the circulation tank and the atomization zone tank. A controllable flow channel is formed using a liftable elastic diaphragm, enabling interconnection between the circulation tank and the zone tank solutions, ensuring uniform solute concentration and preventing sedimentation. Simultaneously, it blocks the direct impact of ripples and turbulence from the circulation pipeline on the atomization zone, maintaining a stable 0.2-1cm ultra-shallow atomization liquid surface. This eliminates the interference of liquid surface fluctuations on the ultrasonic atomization process, reduces the particle size distribution range of the finished powder, and improves the consistency of powder performance across different production batches. Furthermore, it weakens the continuous scouring of the high-transmittance diaphragm by unidirectional water flow, reducing solute accumulation and scaling on the diaphragm surface. This ensures stable atomization efficiency over long-term operation and extends the service life of the ultrasonic components.

[0017] 3. This invention is equipped with two liquid level sensors, one near the circulation tank and the other near the circulation tank. These sensors are used to adjust the height of the elastic diaphragm of the buffer assembly, automatically balancing the liquid levels in the partitioned tank and the circulation tank. This eliminates the continuous unidirectional water flow caused by the liquid level difference, further stabilizing the atomization environment. The supporting component adopts a spoon-shaped integrated structure, distinguishing between the large-capacity circulation tank and the shallow liquid atomization tank. The shallow liquid atomization tank maintains an ultra-shallow atomization operating liquid level, while the large-capacity circulation tank completes the solution anti-sedimentation circulation operation. The structural partitioning is reasonable, facilitating the integrated arrangement of the circulation and buffer components. A bidirectional circulation component is configured within the circulation tank, driving the solution to flow back and forth continuously, flushing the bottom of the tank, inhibiting the sedimentation and stratification of metal salt solutes, ensuring a long-term uniform concentration of the solution entering the atomization zone, and further improving the quality stability of the powder product. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a nano-metal powder preparation micron-sized powder particle size control device provided by the present invention; Figure 2 A three-dimensional structural schematic diagram of the debugging mechanism of a nano-metal powder preparation micron-sized powder particle size control device provided by the present invention; Figure 3 A schematic diagram of the internal three-dimensional structure of the ultrasonic atomization mechanism of a nano-metal powder preparation micron-sized powder particle size control device provided by the present invention. Figure 1 ; Figure 4 A schematic diagram of the internal three-dimensional structure of the ultrasonic atomization mechanism of a nano-metal powder preparation micron-sized powder particle size control device provided by the present invention. Figure 2 ; Figure 5 This is a schematic diagram of the internal three-dimensional structure of the support component of a nano-metal powder preparation micron-sized powder particle size control device according to the present invention; Figure 6 This is a three-dimensional structural diagram of the connection relationship between the circulation partition, circulation pipe one, circulation pump one, circulation pipe two, and circulation pump two in a nano-metal powder preparation micron powder particle size control device provided by the present invention. Figure 7 This is a three-dimensional structural diagram illustrating the connection relationship between the support component and the ultrasonic component of a nano-metal powder preparation micron-sized powder particle size control device provided by the present invention. Figure 8 A three-dimensional structural schematic diagram of a buffer component for a nano-metal powder preparation micron-sized powder particle size control device according to the present invention; Figure 9 This is a schematic diagram of the product collection mechanism of a nano-metal powder preparation micron-sized powder particle size control device provided by the present invention; Figure 10 This is a schematic diagram of the physical separation component of a device for controlling the particle size of nano-metal powders in preparation of micron-sized powders, provided by the present invention. Figure 11 This is a schematic diagram of the electrostatic collection component of a nano-metal powder preparation micron-sized powder particle size control device provided by the present invention.

[0019] List of reference numerals in the attached diagram: 1. Ultrasonic atomizing mechanism; 11. Tank body; 12. Supporting component; 121. Atomizing pool; 122. Circulation pool; 123. Atomizing baffle; 124. Zoned pool; 125. Mounting slot; 126. Mounting through hole; 127. Connecting ring; 13. Ultrasonic component; 131. High sound transmission diaphragm; 132. Variable frequency ultrasonic transducer; 133. Mounting cover; 14. Buffer component; 141. Main frame; 142. Mounting frame; 143. Elastic diaphragm; 144. Support bracket; 145. Electric actuator; 146. Telescopic rod; 147. Top rod; 15. Drainage hood; 16. 17. Mounting rod; 18. Liquid level sensor 1; 19. Liquid level sensor 2; 10. Drainage pipe; 111. Circulation baffle; 112. Circulation pipe 1; 113. Circulation pipe 2; 114. Circulation pump 2; 2. High-temperature pyrolysis mechanism; 3. Product collection mechanism; 31. Physical separation component; 311. Inlet; 312. Outlet; 313. Tail gas outlet; 32. Electrostatic collection component; 321. Positive electric field arrangement structure; 3211. Main trunk; 3212. Positive electrode plate; 322. Negative electric field arrangement structure; 33. Magnetic field adsorption device. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0021] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] Reference Figures 1 to 11 The present invention provides a device for controlling the particle size of nano-metal powder in the preparation of micron-sized powder, including an ultrasonic atomization mechanism 1, a high-temperature pyrolysis mechanism 2, and a product collection mechanism 3; the discharge end of the ultrasonic atomization mechanism 1 is connected to the feed end of the high-temperature pyrolysis mechanism 2, and the discharge end of the high-temperature pyrolysis mechanism 2 is connected to the feed end of the product collection mechanism 3.

[0024] The ultrasonic atomizing mechanism 1 includes a tank 11, a bearing assembly 12, an ultrasonic assembly 13, a buffer assembly 14, a flow guide hood 15, a mounting rod 16, a liquid level sensor 17, a liquid level sensor 2 18, a flow guide tube 19, and a circulation baffle 110.

[0025] The support component 12 is assembled at the bottom of the tank 11. The longitudinal section of the support component 12 is an integrally formed spoon-shaped structure, and the internal space is divided into an interconnected atomizing pool 121 and a circulation pool 122. The atomizing pool 121 corresponds to the spoon handle section, and the overall depth of the pool is shallow, which is suitable for stable atomization operations on ultra-shallow liquid surfaces of 0.2-1cm. The circulation pool 122 corresponds to the spoon head section, and the cavity is deeper, which can store sufficient metal salt precursor solution and undertake the functions of liquid storage, circulation and anti-precipitation. The cavities of the atomizing pool 121 and the circulation pool 122 are interconnected, and the solution can flow freely and replenish each other between the two cavities.

[0026] The side walls of the circulating tank 122 are connected to a raw material feed pipe and a waste liquid discharge pipe, respectively. The raw material feed pipe is used to continuously transport the prepared metal salt precursor solution into the circulating tank to realize automated feeding. The waste liquid discharge pipe is set at the bottom of the circulating tank. After long-term production, the pipe can be opened to discharge the sediment and expired mother liquor at the bottom of the tank, which facilitates cleaning and liquid replacement inside the tank.

[0027] A vertical atomizing baffle 123 is installed in the middle of the inner cavity of the atomizing pool 121, which divides the atomizing pool 121 into two independent partition pools 124. Several installation through holes 126 are opened through the bottom of the two partition pools 124 on the side away from the circulation pool 122, and a square installation through groove 125 is opened on the bottom of the partition pool 124 on the side closer to the circulation pool 122.

[0028] Each mounting through-hole 126 has a stepped groove cut at its lower end, and a coaxial connecting ring 127 is fixedly connected within the stepped groove. The ultrasonic component 13 is correspondingly assembled below each mounting through-hole 126. The ultrasonic component 13 includes a high-transmittance diaphragm 131, a frequency-converting ultrasonic transducer 132, and a mounting cover 133. The high-transmittance diaphragm 131 and the frequency-converting ultrasonic transducer 132 are sequentially embedded into the stepped groove from top to bottom. The mounting cover 133 is threadedly locked to the outer wall of the connecting ring 127, achieving a sealed and fixed position for the high-transmittance diaphragm 131 and the frequency-converting ultrasonic transducer 132. The threaded disassembly structure allows for quick and individual replacement of a single ultrasonic component 13. The frequency-converting ultrasonic transducers 132 in the two partitioned pools 124 are matched with different driving frequencies. One set operates at high frequency to produce nano-sized atomized droplets, while the other operates at low frequency to produce micron-sized atomized droplets, allowing for the simultaneous production of two particle sizes of precursor droplets.

[0029] A buffer assembly 14 is assembled inside the square mounting slot 125. The buffer assembly 14 includes a main frame 141, which is square in shape and matches the size of the square mounting slot 125. A mounting frame 142 is fixedly connected to the upper end of the main frame 141, and a square elastic diaphragm 143 is fixedly connected to the mounting frame 142. The elastic diaphragm 143 has an integrally formed protruding edge around its perimeter, which is sealed and fixed to the upper end of the mounting frame 142. A support frame 144 is fixedly connected to the lower end of the main frame 141. An electric actuator 145 is vertically mounted on the top surface of the support frame 144. A telescopic rod 146 is connected to the upward-facing drive end of the electric actuator 145. A long top rod 147 is fixedly connected to the top of the telescopic rod 146. The top surface of the top rod 147 abuts against, supports, and is fixedly connected to the center of the bottom surface of the elastic diaphragm 143.

[0030] The electric actuator 145 drives the telescopic rod 146 to rise and fall, which in turn drives the top rod 147 to lift the middle of the elastic diaphragm 143, forming a gentle slope structure. After lifting, the two sides of the elastic diaphragm 143 are sealed to the atomizing baffle 123 and the side wall of the partitioned pool 124. The highest point of the elastic diaphragm 143 is always lower than the liquid surface of the atomizing pool 121, so that the partitioned pool 124 and the circulation pool 122 maintain limited liquid communication. The buffer component 14 is set between the ultrasonic atomization zone and the circulation pool 122. It can block the ripples and turbulence generated by the flow of the solution in the circulation pool, avoid the liquid surface fluctuation from interfering with the atomization stability of the frequency conversion ultrasonic transducer 132, and at the same time maintain the slow communication between the two areas to ensure uniform solute concentration.

[0031] A circulation baffle 110 is vertically installed inside the circulation tank 122. A circulation pipe 111 is embedded in one side wall of the circulation baffle 110, and a circulation pipe 113 is embedded in the other side wall. A circulation pump 112 is installed on the circulation pipe 111, and a circulation pump 114 is installed on the circulation pipe 113. The circulation pump 112 and circulation pump 114 work together with the two circulation pipes to achieve bidirectional circulation of the solution inside the circulation tank 122, continuously flushing the bottom of the tank, inhibiting the sedimentation and stratification of metal salt solutes, and ensuring the stability of the solution concentration entering the atomization tank 121.

[0032] Above the two partitioned pools 124, flow guide hoods 15 are respectively installed, with fixed mounting rods 16 on the outside of the flow guide hoods 15. Liquid level sensors 17 and 18 are respectively mounted on the lower end of each mounting rod 16, located on the left and right sides of the buffer assembly 14. Liquid level sensor 17 is positioned near the circulation pool 122 as a reference element for liquid level detection. During operation, the liquid level value collected by liquid level sensor 17 is used as the standard to adjust the extension and retraction stroke of the electric actuator 145 in real time, changing the arch height of the elastic diaphragm 143 to ensure that the highest point of the elastic diaphragm 143 is always lower than the reference liquid level, maintaining equal liquid levels in the partitioned pools 124 and the circulation pool 122, and eliminating the unidirectional water flow impact caused by the liquid level difference. The flow guide hoods 15 are connected to the feed end of the high-temperature pyrolysis mechanism 2 via flow guide pipes 19, uniformly transporting the nano- and micron-sized mixed atomized droplets generated by the two partitioned pools to the pyrolysis process.

[0033] The high-temperature pyrolysis mechanism 2 adopts a segmented temperature-controlled tubular furnace structure. The furnace body is divided into three independent temperature-controlled zones along the material conveying direction, with the length ratio of the three zones controlled at 1-2:1:1. The tubular furnace is made of quartz material, and an airflow rectifying core is installed inside the furnace to eliminate airflow backflow from the tube wall. The atomized droplets conveyed by the ultrasonic atomization mechanism 1 enter the tubular furnace with the carrier gas. The first temperature zone, at 300-400℃, completes droplet dehydration. The second temperature zone, at 700-800℃, undergoes metal salt pyrolysis. The third temperature zone, at 800-1000℃, completes particle shaping and controllable agglomeration. By adjusting the temperature of each temperature zone and the residence time of the powder, the nanoparticles are agglomerated and grown into micron-sized metal powder. The gas outlet of the tubular furnace is connected to the inlet 311 of the physical separation component 31 of the product collection mechanism 3.

[0034] The product collection mechanism 3 includes a physical separation component 31, an electrostatic collection component 32, and a magnetic field adsorption device 33.

[0035] The physical separation component 31 adopts a cyclone separator structure, with an inlet 311, an outlet 312, and a tail gas outlet 313. The inlet 311 is connected to the discharge end of the high-temperature pyrolysis mechanism 2. Large-diameter metal powders are initially separated by inertial gravity in the cyclone separator. The airflow containing ultrafine powders after initial separation is sent to the electrostatic collection component 32 through the outlet 312.

[0036] The electrostatic collection component 32 is disposed in the inner cavity of the cylindrical negative electrode electric field arrangement structure 322, and includes the positive electrode electric field arrangement structure 321. The positive electrode electric field arrangement structure 321 consists of a main trunk 3211 and multiple sets of positive electrode plates 3212 arranged along the main trunk axis. The positive electrode plates 3212 have a serrated structure on their edges to enhance the electric field adsorption effect. The positive electrode electric field arrangement structure 321 is coaxially arranged inside the negative electrode electric field arrangement structure 322, and an annular airflow channel is reserved between the two.

[0037] The magnetic field adsorption device 33 is encased on the outer wall of the negative electrode electric field arrangement structure 322 cylinder, with the magnetic field strength adjustable within the range of 0.01-0.2T. When the airflow passes through the electrostatic collection component 32, the powder is adsorbed and collected under the synergistic effect of the high-voltage electric field and the external magnetic field, significantly improving the collection rate of nano and micron metal powders. The exhaust outlet of the electrostatic collection component 32 is connected to the exhaust gas treatment unit, and the exhaust gas is discharged in compliance with standards after catalytic purification.

[0038] Overall machine workflow: The prepared metal salt solution is introduced into the circulation tank 122 of the support component 12. Circulation pump 112 and circulation pump 212 continuously drive the solution inside the circulation tank to circulate bidirectionally to avoid solute precipitation. The solution passes through the limited flow area above the buffer component 14 and enters the two-part partitioned tank 124. Liquid level sensor 17 and liquid level sensor 218 monitor the liquid level on both sides in real time. The linkage electric actuator 145 adjusts the arch height of the elastic diaphragm 143 to block the disturbance of the water flow ripples in the circulation tank to the atomization zone and maintain the liquid level of the partitioned tank in the ultra-thin range of 0.2-1cm.

[0039] The variable frequency ultrasonic transducers 132 at the bottom of the two-part partitioned pool 124 vibrate at high and low frequencies respectively, and together with the high sound transmission diaphragm 131, they atomize the metal salt solution, simultaneously generating nano- and micro-sized atomized droplets. The two types of droplets are collected and sent into the high-temperature pyrolysis mechanism 2 tube furnace through the upper drainage hood 15 and drainage pipe 19. The dehydration, pyrolysis, and particle agglomeration and growth are completed by segmented temperature control to obtain nano- and micro-sized composite metal powder.

[0040] The airflow carrying the powder enters the product collection mechanism 3, where the coarse powder particles are initially separated by the physical separation component 31. The remaining micro-nano mixed powder enters the electrostatic collection component 32, where the powder is efficiently recovered by electrostatic-magnetic field synergistic adsorption, ultimately yielding micron-sized metal powder with controllable particle size. The exhaust gas is then purified by the matching catalytic exhaust gas system before being discharged.

[0041] It should be noted that not all steps and modules in the above processes and system structure diagrams are mandatory; some steps or modules can be omitted as needed. The execution order of each step is not fixed and can be adjusted as required. The system structure described in the above embodiments can be a physical structure or a logical structure. That is, some modules may be implemented by the same physical entity, or some modules may be implemented by multiple physical entities, or they may be jointly implemented by certain components in multiple independent devices.

[0042] In the above embodiments, the hardware modules can be implemented mechanically or electrically. The present invention has been described and illustrated in detail above with reference to the accompanying drawings and preferred embodiments. However, the present invention is not limited to these disclosed embodiments. Based on the above embodiments, those skilled in the art will understand that more embodiments of the present invention can be obtained by combining the means in the different embodiments described above, and these embodiments are also within the protection scope of the present invention.

Claims

1. A device for controlling the particle size of nano-metal powders in the preparation of micron-sized powders, characterized in that, It includes an ultrasonic atomizing mechanism (1), a high-temperature pyrolysis mechanism (2), and a product collection mechanism (3); the discharge end of the ultrasonic atomizing mechanism (1) is connected to the feed end of the high-temperature pyrolysis mechanism (2), and the discharge end of the high-temperature pyrolysis mechanism (2) is connected to the feed end of the product collection mechanism (3); The ultrasonic atomizing mechanism (1) includes a tank (11), a bearing assembly (12), an ultrasonic assembly (13), a buffer assembly (14), a mounting rod (16), a liquid level sensor one (17), and a liquid level sensor two (18); The bearing component (12) is located at the bottom of the tank (11) and has an integral spoon-shaped structure. It is internally connected to a shallow liquid atomizing tank (121) and a large-capacity circulation tank (122). The circulation tank (122) is equipped with a feed pipe and a drain pipe. The atomizing tank (121) is equipped with an atomizing baffle (123) to separate two groups of partitioned tanks (124). The bottom of each partitioned tank (124) is provided with an installation through hole (126) and an installation through groove (125). The circulation tank (122) is equipped with a circulation baffle (110) and a circulation component for preventing sedimentation during solution circulation. An ultrasonic component (13) capable of producing droplets of different particle sizes is installed at the mounting through hole (126). A buffer component (14) is provided in the mounting through groove (125). The buffer component (14) is used to block the water flow ripples of the circulating pool from disturbing the atomization zone and to maintain limited interconnection between the partitioned pool and the circulating pool. Each zone pool (124) is equipped with a flow hood (15) above it. A liquid level sensor 1 (17) and a liquid level sensor 2 (18) are respectively mounted on the mounting rod (16). The liquid level sensor 1 (17) serves as a reference linkage buffer assembly (14) to adjust the flow height and ensure that the liquid levels on both sides are equal. The flow hood (15) is connected to the high-temperature pyrolysis mechanism (2) through the flow pipe (19). The high-temperature pyrolysis mechanism (2) is a segmented temperature-controlled tube furnace, used for dehydrating and pyrolyzing atomized droplets and agglomerating nanoparticles to form target micron-sized metal powder; The product collection mechanism (3) completes the graded collection of micro-nano powders through electrostatic and magnetic field synergistic adsorption.

2. The nano-metal powder preparation micron-sized powder particle size control device according to claim 1, characterized in that: The circulation assembly includes circulation pipe one (111), circulation pump one (112), circulation pipe two (113), and circulation pump two (114); circulation pipe one (111) and circulation pipe two (113) are respectively embedded on both sides of the circulation partition (110), and circulation pump one (112) and circulation pump two (114) are respectively installed on circulation pipe one (111) and circulation pipe two (113).

3. The nano-metal powder preparation micron-sized powder particle size control device according to claim 1, characterized in that: The ultrasonic component (13) includes a high-transmission diaphragm (131), a frequency-converting ultrasonic transducer (132), and a mounting cover (133); the lower end of the mounting through hole (126) is provided with an embedded stepped groove and a connecting ring (127), the high-transmission diaphragm (131) and the frequency-converting ultrasonic transducer (132) are stacked and installed in the stepped groove, and the mounting cover (133) and the connecting ring (127) are threaded and sealed.

4. According to claim 3, in a nano-metal powder preparation micron-sized powder particle size control device, the variable frequency ultrasonic transducer (132) in the two-component partitioned pool (124) adopts two working frequencies, high frequency and low frequency, respectively, to simultaneously produce nano-sized and micron-sized atomized droplets.

5. The nano-metal powder preparation micron-sized powder particle size control device according to claim 1, characterized in that: The buffer assembly (14) includes a main frame (141), which is square in shape and matches the size of the square mounting slot (125). The upper end of the main frame (141) is fixedly connected to a mounting frame (142), and a square elastic diaphragm (143) is fixedly connected to the mounting frame (142). The elastic diaphragm (143) has an integrally formed protrusion around its perimeter, and the protrusion is sealed and fixed to the upper end of the mounting frame (142).

6. The nano-metal powder preparation micron-sized powder particle size control device according to claim 5, characterized in that: A support frame (144) is fixedly connected to the lower end of the main frame (141). An electric push rod (145) is vertically installed on the top surface of the support frame (144). A telescopic rod (146) is connected to the drive end of the electric push rod (145) facing upward. A long top rod (147) is fixedly connected to the top of the telescopic rod (146). The top surface of the top rod (147) abuts against and is fixedly connected to the center of the bottom surface of the elastic diaphragm (143).

7. The nano-metal powder preparation micron-sized powder particle size control device according to claim 1, characterized in that: The tubular furnace of the high-temperature pyrolysis mechanism (2) is divided into three temperature control zones along the material flow direction. The length ratio of the three temperature zones is 1-2:1:

1. The working temperatures of the three temperature zones are 300-400℃, 700-800℃, and 800-1000℃ respectively. An airflow rectifier core is installed inside the furnace to balance the airflow.

8. The nano-metal powder preparation micron-sized powder particle size control device according to claim 1, characterized in that: The product collection mechanism (3) includes a physical separation component (31), an electrostatic collection component (32), and a magnetic field adsorption device (33); the physical separation component (31) is a cyclone separator, and the physical separation component (31) is connected to the electrostatic collection component (32); the electrostatic collection component (32) includes a positive electric field arrangement structure (321) and a cylindrical negative electric field arrangement structure (322) arranged coaxially; the magnetic field adsorption device (33) is wrapped around the outer wall of the negative electric field arrangement structure (322), and the magnetic field strength is adjustable in the range of 0.01-0.2T.

9. The nano-metal powder preparation micron-sized powder particle size control device according to claim 8, characterized in that: The positive electrode electric field arrangement structure (321) includes a main trunk (3211) and multiple positive electrode sheets (3212) arranged along the axis of the main trunk (3211). The positive electrode sheets (3212) have a serrated structure on their edges to enhance the electric field adsorption capacity.

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