Dual-channel unpowered micro-nano powder classifier and powder classification method

Abstract

This invention discloses a dual-channel, non-powered micro / nano particle classifier and classification method, comprising an upper shell, an upper movable exhaust pipe, an upper adjusting device, an upper cyclone impeller, a lower shell, a lower movable exhaust pipe, a lower adjusting device, and a lower cyclone impeller. The upper shell has a side air inlet and an upper exhaust port at its top, through which the upper movable exhaust pipe is inserted downwards into the upper shell. The lower shell has a lower exhaust port at its bottom, through which the lower movable exhaust pipe is inserted upwards into the lower shell. The upper movable exhaust pipe is connected to the upper adjusting device, and its lower end is connected to the upper cyclone impeller. The lower movable exhaust pipe is connected to the lower adjusting device, and its upper end is connected to the lower cyclone impeller. This invention can classify and screen micro / nano particles that meet the controlled particle size (particle size < 10 μm).

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of powder selection, and particularly relates to a double-channel non-powered micro-nano powder selection machine and a powder selection method, which are used for preparing micro-nano powder materials in stages. BACKGROUND

[0002] With the rapid development of industry and the continuous improvement of the technological level, people pay more and more attention to the research on micro-nano materials. With the infinite refinement of the particle size of powder, materials have some special effects and performances which conventional materials do not have. Large-scale industrial production and commercial application of micro-nano materials will become a reality and development direction.

[0003] In the production and preparation method of micro-nano materials, mechanical crushing is one of the commonly used methods. That is, through the action of crushing and grinding forces, solid block materials are deformed and broken to produce finer particles. Then, the fine particles and powders are classified and refined into powder products with different particle sizes through gas-solid separation equipment and are applied to different fields. The powder selection machine is a commonly used and important classification equipment. From the early centrifugal powder selection machine and cyclone powder selection machine to the mainstream dynamic rotor cage powder selection machine and the ultra-fine powder selection machine developed today, the limit particle size that can be classified and screened by them is limited. Even if the rotor speed of the powder selection machine is adjusted to 3000 rpm, it is difficult to classify and screen micro-powder particles with a particle size of less than 10 microns. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a double-channel non-powered micro-nano powder selection machine and a powder selection method to solve the above problems in the prior art. The tangential dust-containing gas flow is introduced into the double-channel non-powered micro-nano powder selection machine and the powder selection method. The dust-containing gas flow is adjusted in position by the upper and lower adjusting devices. After cyclone separation, the dust-containing gas flow is divided into two gas flows. The micro-nano particles with a particle size less than the control particle size are uniformly discharged along the upper and lower channels. The fine powder particles with a particle size greater than the control particle size are settled at the bottom of the shell and are discharged from the discharge port.

[0005] To achieve the above technical purpose, the technical scheme adopted by the present application is as follows:

[0006] A double-channel non-powered micro-nano powder selection machine comprises an upper shell, an upper movable exhaust pipe, an upper adjusting device, an upper cyclone impeller, a lower shell, a lower movable exhaust pipe, a lower adjusting device and a lower cyclone impeller.

[0007] The upper shell is laterally provided with an air inlet. An upper exhaust port is formed in the center of the top of the upper shell. The upper movable exhaust pipe is inserted into the upper shell from the upper exhaust port. The upper movable exhaust pipe is in sealing sliding connection with the upper exhaust port.

[0008] The lower shell top is connected with the upper shell bottom, a lower exhaust port is arranged in the center of the lower shell bottom, a discharge port is arranged on one side of the bottom, a lower movable exhaust pipe is inserted into the lower shell from the lower exhaust port, and the lower movable exhaust pipe is in sealing sliding connection with the lower exhaust port;

[0009] The upper movable exhaust pipe is connected with an upper adjusting device for driving the upper movable exhaust pipe to slide up and down, and the lower end of the upper movable exhaust pipe is fixedly connected with an upper cyclone impeller;

[0010] The lower movable exhaust pipe is connected with a lower adjusting device for driving the lower movable exhaust pipe to slide up and down, and the upper end of the lower movable exhaust pipe is fixedly connected with a lower cyclone impeller.

[0011] As a further improved technical solution of the application, the upper adjusting device and the lower adjusting device are the same in structure and each include a guide rod, a support frame, a fixed exhaust pipe and a lifting execution structure;

[0012] In the upper adjusting device, the support frame is fixedly connected with the upper shell top, one end of the fixed exhaust pipe is located inside the upper movable exhaust pipe and the upper movable exhaust pipe is in sealing sliding connection with the fixed exhaust pipe, the end flange of the other end of the fixed exhaust pipe is fixedly connected with the support frame, a scale ruler is arranged on the support frame, the guide rod is fixedly connected with the upper shell, the end flange of the upper movable exhaust pipe is in sliding connection with the guide rod, the end flange of the upper movable exhaust pipe is provided with a pointer pointing to the scale ruler, and the lifting execution structure is connected with the upper movable exhaust pipe and is used for driving the upper movable exhaust pipe to slide up and down.

[0013] In the lower adjusting device, the support frame is fixedly connected with the lower shell bottom, one end of the fixed exhaust pipe is located inside the lower movable exhaust pipe and the lower movable exhaust pipe is in sealing sliding connection with the fixed exhaust pipe, the end flange of the other end of the fixed exhaust pipe is fixedly connected with the support frame, a scale ruler is arranged on the support frame, the guide rod is fixedly connected with the lower shell, the end flange of the lower movable exhaust pipe is in sliding connection with the guide rod, the end flange of the lower movable exhaust pipe is provided with a pointer pointing to the scale ruler, and the lifting execution structure is connected with the lower movable exhaust pipe and is used for driving the lower movable exhaust pipe to slide up and down.

[0014] As a further improved technical solution of the application, the lifting execution structures in the upper adjusting device and the lower adjusting device are both two, and the lifting execution structures adopt worm and gear lifts.

[0015] The screw rods in the two worm and gear elevators are in threaded connection with the end flanges of the upper movable exhaust pipe; one end of the guide rod is fixedly connected with the end flange of the upper exhaust port, and the other end of the guide rod is fixedly connected with the end flange of the fixed exhaust pipe; the end flange of the upper exhaust port is in sealed sliding connection with the outer wall of the upper movable exhaust pipe through a sealing element; and the end flange of the upper movable exhaust pipe is in sealed sliding connection with the outer wall of the fixed exhaust pipe through a sealing element.

[0016] The screw rods in the two worm and gear elevators are in threaded connection with the end flanges of the lower movable exhaust pipe; one end of the guide rod is fixedly connected with the end flange of the lower exhaust port, and the other end of the guide rod is fixedly connected with the end flange of the fixed exhaust pipe; the end flange of the lower exhaust port is in sealed sliding connection with the outer wall of the lower movable exhaust pipe through a sealing element; and the end flange of the lower movable exhaust pipe is in sealed sliding connection with the outer wall of the fixed exhaust pipe through a sealing element.

[0017] As a further improved technical solution of the present application, the bottom inner side of the lower shell is provided with a scraping device for scraping fine powder particles to the discharge port.

[0018] As a further improved technical solution of the present application, the scraping device comprises a driving structure, a transmission sprocket, a conical roller, a spherical ball, an annular track, a support ring and a scraping plate, the annular track is fixedly connected horizontally on the inner wall of the lower shell, the support ring is in sliding connection with the annular track through the spherical ball, a plurality of conical rollers are evenly connected on the support ring and matched with the transmission sprocket, the driving structure is fixedly connected on the outer wall of the lower shell, the output end of the driving structure penetrates through the lower shell and is connected with the transmission sprocket inside the lower shell, the scraping plate is fixedly connected on the lower part of the support ring and in contact with the bottom wall of the inner side of the lower shell, the inner wall of the lower shell is further connected with a dust cover for shielding the scraping device, the lower movable exhaust pipe is located in the through hole inside the dust cover and the support ring, and the discharge port is connected with a discharge pipe.

[0019] The driving structure is used for driving the transmission sprocket to rotate, the transmission sprocket drives the support ring to rotate through the conical roller, the support ring drives the scraping plate to rotate, and the scraping plate scrapes the fine powder particles to the discharge port and discharges them from the discharge pipe.

[0020] As a further improved technical solution of the present application, the air inlet is provided with a damper device for adjusting the cross-sectional area of the air inlet channel.

[0021] As a further improved technical solution of the present invention, the damper device includes a valve plate, a guide sleeve, a pin, a bracket, an adjusting screw, and an adjusting nut. The valve plate is rotatably connected to the inner side wall of the air inlet of the upper housing via the pin. The bracket is fixedly connected to the outer side wall of the air inlet of the upper housing. One end of the adjusting screw is rotatably and slidably connected to the strip hole in the middle of the valve plate. The other end passes through the reserved hole on the side wall of the air inlet, the guide sleeve fixedly connected to the outside of the reserved hole, and the center hole of the bracket in sequence, and is then threadedly connected to the adjusting nut. One end of the adjusting nut is embedded in the inner side of the bracket and can rotate circumferentially inside the bracket.

[0022] As a further improved technical solution of the present invention, the upper cyclone impeller and the lower cyclone impeller are symmetrically arranged, and each includes a flow stabilizing ring, cyclone blades and a plum blossom-shaped cyclone blade base plate; multiple cyclone blades are arranged between the flow stabilizing ring and the cyclone blade base plate, evenly distributed along the circumference; the top of one side of the cyclone blade is fixedly connected to the flow stabilizing ring, and the bottom is fixedly connected to the cyclone blade base plate; the cyclone blade spirals upward and gradually expands towards the inside of the flow stabilizing ring; the top of the other side of the cyclone blade is located inside the flow stabilizing ring and is suspended, and the bottom is fixedly connected to the cyclone blade base plate;

[0023] Each cyclone blade has three blades, which are evenly distributed at 120° intervals around the circumference. The cyclone blades are fixedly connected to the flow stabilizer and the cyclone blade base plate by welding. An air inlet is formed between two adjacent cyclone blades.

[0024] As a further improvement of the present invention, the upper shell adopts a volute-shaped structure, the outer wall of the lower shell is fixedly connected to the support skirt, and a sampling device is also provided at the bottom of the lower shell.

[0025] To achieve the above-mentioned technical objectives, another technical solution adopted by the present invention is as follows:

[0026] A powder selection method for a dual-channel, non-powered micro / nano powder classifier includes:

[0027] Adjustment steps:

[0028] The lifting actuators in the upper and lower adjustment devices are energized; the upper adjustment device adjusts the lifting of the upper movable exhaust pipe, thereby driving the upper cyclone impeller to move up and down; the lower adjustment device adjusts the lifting of the lower movable exhaust pipe, thereby driving the lower cyclone impeller to move up and down; ultimately, the vertical positions of the upper and lower cyclone impellers within the upper and lower housings, as well as the distance between the upper and lower cyclone impellers, are adjusted; the smaller the distance between the upper and lower cyclone impellers, and the lower the positions of the upper and lower cyclone impellers within the upper and lower housings, the finer the final micro-nano product obtained;

[0029] Selection steps:

[0030] After preliminary classification, the dust-laden airflow enters at high speed through the side air inlet of the upper shell. It is tangentially introduced into the upper shell by the smooth involute at the air inlet. Under the combined action of the downward pressure from the top of the upper shell and the downward tilt angle of the air inlet, an airflow rotating at high speed around the central axis is formed in the upper and lower shells. Under the action of centrifugal force, the coarser fine powder is thrown to the inner wall of the upper and lower shells. After colliding with the inner wall, it loses kinetic energy. Under the action of gravity, the coarser fine powder settles down to the bottom of the lower shell and is discharged from the discharge port.

[0031] The airflow, initially treated by centrifugal force, is then drawn in by the negative pressure of the upper and lower cyclone impellers, splitting into upper and lower airflows. The airflow velocity slows down, with the upper airflow entering tangentially through multiple circumferentially distributed inlets of the upper cyclone impeller, and the lower airflow entering tangentially through multiple circumferentially distributed inlets of the lower cyclone impeller. The three spirally opening blades of the upper and lower cyclone impellers gently guide the tangential rotating airflow into axial airflow. Simultaneously, the upper and lower cyclone impellers perform a second stage of grading and filtration on the initially treated dust-laden airflow. The treated fine powder airflow is discharged from the upper movable exhaust pipe above and the lower movable exhaust pipe below, respectively. The fine powder particles in the airflow are captured and collected by the dust collector in the subsequent process and stored as the final product.

[0032] As a further improvement to the present invention, the adjustment step further includes:

[0033] The valve opening of the valve plate at the side air inlet of the upper housing is adjusted by adjusting the adjusting nut in the damper device, thereby adjusting the cross-sectional area of ​​the air inlet and controlling the initial wind speed of the dust-laden airflow entering the upper housing. The smaller the valve plate opening, the faster the air speed at the air inlet, the higher the dust collection efficiency, and the finer the micro-nano finished product.

[0034] The powder selection process also includes:

[0035] When the scraping device installed at the bottom of the lower housing is powered on, the drive structure in the scraping device drives the scraper to rotate along the shaft of the classifier. The scraper slowly scrapes the coarser fine powder material that has settled to the bottom of the lower housing to the discharge port for discharge.

[0036] The beneficial effects of this invention are as follows:

[0037] The dust-laden airflow (particle size <15μm), after preliminary classification by the ultrafine classifier, enters at high speed through the side inlet of the volute-shaped upper shell. It is smoothly and tangentially introduced into the machine body by an involute curve. Under the combined action of the downward pressure of the upper shell's top cover and the downward inclination of the inlet, a high-speed rotating airflow is formed around the central axis within the machine body. Under centrifugal force, the coarser fine powder (particle size > approximately 5μm) is thrown against the inner walls of the upper and lower shells. Upon collision with the inner walls, it loses kinetic energy and, under gravity, settles to the bottom of the lower shell. A scraper device installed at the bottom of the lower shell rotates along the classifier's axis under the action of a drive sprocket, and the scraper slowly scrapes the settled fine powder to the discharge port area for discharge. The airflow, initially treated by centrifugal force, is then drawn in by the negative pressure of the upper and lower cyclone impellers, splitting into upper and lower airflows. The flow velocity slows down significantly, and the kinetic energy is sharply reduced before the airflow enters tangentially through the three circumferentially distributed air inlets of the upper and lower cyclone impellers. The three spiral involute blades of the upper and lower cyclone impellers gently guide the tangential rotating airflow into axial airflow. Simultaneously, the upper and lower cyclone impellers perform a second stage of filtration on the pre-treated dust-laden airflow. The treated fine powder airflow is discharged from the upper and lower fixed exhaust pipes, respectively. The fine powder particles (particle size < approximately 5μm) in the fine powder airflow are captured and collected by the dust collector in the subsequent process and stored as the final product.

[0038] The upper adjustment device can adjust the upper movable exhaust pipe to rise and fall within a certain range, thereby driving the upper cyclone impeller to move up and down; the lower adjustment device can adjust the lower movable exhaust pipe to rise and fall within a certain range, thereby driving the lower cyclone impeller to move up and down. The vertical positions of the upper and lower cyclone impellers within the casing, as well as the distance between them, directly affect the pressure difference and internal air velocity within the machine, thus regulating the specific surface area and particle size of the fine powder. The smaller the distance between the upper and lower cyclone impellers and the lower their positions within the casing, the finer the micro-nano product. By adjusting the valve opening on the valve plate of the side air inlet, the cross-sectional area of ​​the air inlet can be adjusted to control the initial air velocity of the dust-laden airflow entering the micro-nano classifier. The smaller the valve opening, the faster the inlet air velocity, the higher the dust collection efficiency, and the finer the micro-nano product.

[0039] The preceding process uses an ultrafine classifier to pre-treat the dust, reducing the dust concentration. The dust is then further classified using this technology, and finally captured and collected by a dust collector in the subsequent process. This process can ultimately produce micro-nano particles with controlled particle sizes of D97=5μm and D97=3μm. Attached Figure Description

[0040] Figure 1 This is a top view of a dual-channel, non-powered micro / nano powder classifier.

[0041] Figure 2for Figure 1 AA section diagram.

[0042] Figure 3 for Figure 1 BB cross-section diagram.

[0043] Figure 4 for Figure 3 A magnified view of part A in the image.

[0044] Figure 5 This is an enlarged view of the scraping device.

[0045] Figure 6 for Figure 5 View from A in the middle.

[0046] Figure 7 This is an enlarged view of the damper device.

[0047] Figure 8 This is a front view of either the upper or lower cyclone impeller.

[0048] Figure 9 This is a top view of either the upper or lower cyclone impeller.

[0049] Figure 10 Three-dimensional, either with an upper or lower cyclone impeller Figure 1 .

[0050] Figure 11 This is a structural diagram of the cyclone blade base plate.

[0051] Figure 12 Three-dimensional, either with an upper or lower cyclone impeller Figure 2 . Detailed Implementation

[0052] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0053] like Figures 1-2 As shown, a dual-channel non-powered micro-nano powder classifier includes an upper shell 1, an upper movable exhaust pipe 2, an upper adjustment device 3, an upper cyclone impeller 6, a lower shell 7, a lower movable exhaust pipe 8, a lower adjustment device 9, and a lower cyclone impeller 10.

[0054] like Figures 1-2 As shown, the upper housing 1 resembles a volute. A side air inlet 101 is located on the side housing away from the center of the upper housing 1, using a smooth involute curve to tangentially introduce high-speed airflow into the upper housing 1. An upper exhaust port is located at the center of the top cover of the upper housing 1. An upper movable exhaust pipe 2 is inserted downwards into the upper housing 1 from the upper exhaust port to exhaust airflow. The upper movable exhaust pipe 2 is slidably connected to the upper exhaust port.

[0055] The top flange of the lower housing 7 is connected to the bottom flange of the upper housing 1. The upper flange of the lower housing 7 supports the upper housing 1, and its outer wall is welded to the support skirt 14. The weight of the equipment is transferred to the foundation through the support skirt 14. A lower exhaust port is opened at the center of the bottom of the lower housing 7, and a discharge port is opened on one side of the bottom. The collected fine powder is discharged from the machine body through the discharge port area. The lower movable exhaust pipe 8 is inserted upward into the lower housing 7 from the lower exhaust port, and the lower movable exhaust pipe 8 is slidably connected to the lower exhaust port in a sealed manner.

[0056] The upper movable exhaust pipe 2 is connected to an upper adjusting device 3 for driving the upper movable exhaust pipe 2 to slide up and down, and an upper cyclone impeller 6 is fixedly connected to the lower end of the upper movable exhaust pipe 2. The lower movable exhaust pipe 8 is connected to a lower adjusting device 9 for driving the lower movable exhaust pipe 8 to slide up and down, and a lower cyclone impeller 10 is fixedly connected to the upper end of the lower movable exhaust pipe 8.

[0057] In this embodiment, the upper adjustment device 3 and the lower adjustment device 9 are symmetrically arranged, each including a guide rod 301, a support frame 302, a fixed exhaust pipe 304, and a lifting and lowering actuator.

[0058] like Figures 3-4 As shown, in the upper adjustment device 3, the support frame 302 is fixedly connected to the top of the upper housing 1. The lower end of the fixed exhaust pipe 304 is located inside the upper movable exhaust pipe 2, and the upper movable exhaust pipe 2 is slidably connected to the fixed exhaust pipe 304. The end flange 309 at the upper end of the fixed exhaust pipe 304 is fixedly connected to the support frame 302. A scale 305 is provided on the support frame 302. The guide rod 301 is fixedly connected to the upper housing 1. The end flange 309 at the upper end of the upper movable exhaust pipe 2 is slidably connected to the guide rod 301 through a bushing 308. The end flange 309 at the upper end of the upper movable exhaust pipe 2 is provided with a pointer 306 pointing to the scale 305. The pointer 306 moves as the upper movable exhaust pipe 2 moves. The lifting actuator is connected to the upper movable exhaust pipe 2 and is used to drive the upper movable exhaust pipe 2 to slide up and down.

[0059] Similarly, in the upper adjusting device 3, in the lower adjusting device 9, the support frame 302 is fixedly connected to the bottom of the lower housing 7. The upper end of the fixed exhaust pipe 304 is located inside the lower movable exhaust pipe 8, and the lower movable exhaust pipe 8 is slidably connected to the fixed exhaust pipe 304. The end flange 309 at the lower end of the fixed exhaust pipe 304 is fixedly connected to the support frame 302. A scale 305 is provided on the support frame 302. The guide rod 301 is fixedly connected to the lower housing 7. The end flange 309 at the lower end of the lower movable exhaust pipe 8 is slidably connected to the guide rod 301 through a bushing 308. The end flange 309 at the lower end of the lower movable exhaust pipe 8 is provided with a pointer 306 pointing to the scale 305. The pointer 306 moves as the lower movable exhaust pipe 8 moves. The lifting actuator is connected to the lower movable exhaust pipe 8 and is used to drive the lower movable exhaust pipe 8 to slide up and down.

[0060] By observing the scale indicated by pointer 306, the vertical distance of the upper movable exhaust pipe 2 and the lower movable exhaust pipe 8 can be determined from outside the machine body. This allows us to know the distance between the upper cyclone impeller 6 and the lower cyclone impeller 10. The vertical positions of the upper cyclone impeller 6 and the lower cyclone impeller 10 within the casing, as well as the distance between them, directly affect the pressure difference and internal wind speed within the machine body. This allows us to adjust the specific surface area and particle size of the fine powder, making it a very important parameter.

[0061] In the upper adjustment device 3, the lead screws 401 (screws) in the two worm gear jacks 4 are threadedly connected to the end flanges 309 of the upper movable exhaust pipe 2; the lower end of the guide rod 301 is fixedly connected to the end flange 309 of the upper exhaust port, and the upper end of the guide rod 301 is fixedly connected to the end flange 309 of the fixed exhaust pipe 304; the end flange 309 of the upper exhaust port and the outer wall of the upper movable exhaust pipe 2 are slidably connected by a sealing element 303. The sealing element 303 is installed in the sealing groove of the end flange 309 of the upper exhaust port and is compacted by a pressure plate 307. The pressure plate 307 is fixed to the end flange 309 of the upper exhaust port by bolts. The sealing element 303 mainly seals the gap between the outer wall of the upper movable exhaust pipe 2 and the upper exhaust port. The end flange 309 of the upper movable exhaust pipe 2 is slidably connected to the outer wall of the fixed exhaust pipe 304 through a sealing element 303. The sealing element 303 is installed in the sealing groove of the end flange 309 of the upper movable exhaust pipe 2 and is compacted by a pressure plate 307. The pressure plate 307 is fixed to the end flange 309 of the upper movable exhaust pipe 2 by bolts. The sealing element 303 mainly seals the gap between the inner side of the upper movable exhaust pipe 2 and the fixed exhaust pipe 304. When the motor in the worm gear jack 4 drives the worm gear screw to rotate, it can drive the upper movable exhaust pipe 2 to move up and down along the guide rod 301, thereby driving the upper cyclone impeller 6 welded to the lower end to move up and down synchronously. The sealing element 303 ensures that the upper movable exhaust pipe 2 remains sealed when it moves up and down, ensuring that the airflow inside the machine does not leak out.

[0062] Similarly, in the upper adjusting device 3, in the lower adjusting device 9, the lead screws 401 in both worm gear jacks 4 are threadedly connected to the end flanges 309 of the lower movable exhaust pipe 8; the upper end of the guide rod 301 is fixedly connected to the end flange 309 of the lower exhaust port, and the lower end of the guide rod 301 is fixedly connected to the end flange 309 of the fixed exhaust pipe 304; the end flange 309 of the lower exhaust port and the outer wall of the lower movable exhaust pipe 8 are slidably connected by a sealing element 303. When the motor in the worm gear jack 4 drives the worm screw to rotate, it can drive the lower movable exhaust pipe 8 to move up and down along the guide rod 301, thereby driving the lower cyclone impeller 10 welded to the upper end to move up and down synchronously. The sealing element 303 ensures that the lower movable exhaust pipe 8 remains sealed during its up and down movement, preventing airflow from leaking out of the machine.

[0063] In this embodiment, a scraping device 11 is provided on the inner bottom side of the lower housing 7. The scraping device 11 is used to scrape fine powder particles to the discharge port for discharge.

[0064] In this embodiment, as Figures 5-6As shown, the scraping device 11 includes a drive structure 1101, a transmission sprocket 1102, a tapered roller 1103, spherical balls 1106, an annular track 1107, a support ring 1108, and a scraper 1109. The annular track 1107 is leveled and welded to the inner wall of the lower housing 7. The support ring 1108 is supported on the annular track 1107 by four spherical balls 1106 and is slidably connected to the annular track 1107, and can rotate freely in the circumferential direction with the center of the lower housing 7 as the axis. Several tapered rollers 1103 are evenly connected to the support ring 1108 according to the sprocket pitch interval and mesh with the transmission sprocket 1102. The drive structure 1101 is fixedly connected to the outer wall of the lower housing 7. The output end 1110 of the drive structure 1101 passes through the lower housing 7 and is connected to the transmission sprocket 1102 inside the lower housing 7. The output end 1110 of the drive structure 1101 drives the transmission sprocket 1102 to rotate at a fixed point. The transmission sprocket 1102 meshes with the tapered rollers 1103, causing the support ring 1108 to rotate circumferentially on the annular track 1107. The scraper 1109 is welded and fixed to the lower part of the support ring 1108. The scraper 1109 contacts the inner bottom wall of the lower housing 7. The scraper 1109 moves together with the circumferential rotation of the support ring 1108, thereby slowly scraping the fine powder material that has settled to the bottom of the classifier to the discharge port area at the bottom of the lower housing 7 for discharge. The inner wall of the lower housing 7 is also connected to a dust cover 15 for shielding the scraping device 11. The dust cover 15 is fixed to the inner wall of the lower housing 7 by bolts to shield the dust settling from the upper part of the scraping device, preventing the dust from falling directly onto the annular track 1107 or the meshing point with the transmission sprocket 1102, thus interfering with the normal operation of the scraping device. The lower movable exhaust pipe 8 is located in the through hole inside the dust cover 15 and the support ring 1108, and the discharge port is connected to the discharge pipe 12.

[0065] Both the support ring 1108 and the annular track 1107 are closed circular structures. The support ring 1108 has two rings. After forming, welding, and stress relief by annealing, the pin holes on the inner and outer support rings are machined as a whole to ensure coaxiality. The pin holes on the support ring 1108 and the pin 1105 are clearance fit, allowing the pin 1105 to be easily inserted into the pin holes on the support ring 1108. The outer side is positioned by a shaft elastic retaining ring to prevent the pin 1105 from moving around. The tapered roller 1103 and the pin 1105 are transition fit. During operation, there is a risk of axial movement between the tapered roller 1103 and the pin 1105. Therefore, nylon spacers 1104 are provided on both sides of the tapered roller 1103. The nylon spacers 1104 and the pin 1105 are clearance fit. The main function of the nylon spacers 1104 is to prevent the tapered roller 1103 from moving around axially. Even if the tapered roller 1103 moves around axially, the nylon spacers 1104 will wear first, thus providing a certain degree of protection for the tapered roller 1103. The dust cover 15 is a closed ring with an irregularly shaped structure designed for clearance. The main function of the dust cover 15 is to prevent material from falling directly onto the meshing part of the drive sprocket 1102 and the tapered roller 1103, thus affecting the transmission efficiency. There is a large gap between the dust cover 15 and the lower movable exhaust pipe 8 below; this gap is used for material discharge.

[0066] The drive structure 1101 is used to drive the transmission sprocket 1102 to rotate. The transmission sprocket 1102 drives the support ring 1108 to rotate through the conical roller 1103. The support ring 1108 drives the scraper 1109 to rotate. The scraper 1109 scrapes the fine powder particles to the discharge port and then discharges them from the feed pipe 12.

[0067] In this embodiment, the air inlet 101 is provided with a damper device 5 for adjusting the cross-sectional area of ​​the air inlet duct.

[0068] In this embodiment, as Figure 7As shown, the damper device 5 includes a valve plate 501, a guide sleeve 502, a pin 503, a bracket 504, an adjusting screw 505, and an adjusting nut 506. The valve plate 501 is rotatably connected to the inner wall of the air inlet 101 of the upper housing 1 via the pin 503, and the valve plate 501 can rotate freely around the pin 503. The bracket 504 is fixedly connected to the outer wall of the air inlet 101 of the upper housing 1. One end of the adjusting screw 505 is rotatably and slidably connected to the strip hole (elongated eyelet) in the middle of the valve plate 501 via a pin, and the other end passes through a reserved hole on the side wall of the air inlet 101, the guide sleeve 502 fixedly connected to the outside of the reserved hole, and the center hole of the bracket 504, and is then threadedly connected to the hexagonal adjusting nut 506. One end of the adjusting nut 506 is embedded inside the bracket 504 and can rotate circumferentially inside the bracket 504. The axial displacement of the adjusting nut 506 is limited by the bracket 504, but it can rotate circumferentially. When the adjusting nut 506 rotates circumferentially, it can drive the adjusting screw 505 to move axially through the threaded engagement, thereby pulling the valve plate 501 to move and affecting the valve opening. By changing the valve opening, the cross-sectional area of ​​the air inlet can be adjusted to control the initial wind speed of the dust-laden airflow entering the micro-nano classifier.

[0069] In this embodiment, as Figures 8-12 As shown, the upper cyclone impeller 6 and the lower cyclone impeller 10 are symmetrically arranged, and each includes a flow stabilizing ring 601, cyclone blades 602, and a plum blossom-shaped cyclone blade base plate 603; multiple cyclone blades 602 are arranged circumferentially between the flow stabilizing ring 601 and the cyclone blade base plate 603; the top of one side of the cyclone blade 602 is fixedly connected to the flow stabilizing ring 601, and the bottom is fixedly connected to the cyclone blade base plate 603; the cyclone blade 602 spirals upward and gradually extends towards the inside of the flow stabilizing ring 601; the top of the other side of the cyclone blade 602 is located inside the flow stabilizing ring 601 and is suspended, and the bottom is fixedly connected to the cyclone blade base plate 603. Each cyclone blade 602 has three blades, which are evenly distributed at 120° intervals around the circumference. The cyclone blade 602 is fixedly connected to the flow stabilizer ring 601 and the cyclone blade base plate 603 by welding. An air inlet is formed between two adjacent cyclone blades 602.

[0070] The flow stabilizing ring 601 of the upper cyclone impeller 6 is positioned and welded to the inlet of the upper movable exhaust pipe 2. The lower part is the air intake zone, which is inverted conical in shape, and the upper part is the flow stabilizing transition zone, which is cylindrical in shape. The upper cyclone impeller 6 contains three involute blades (cyclone blades 602), which are evenly distributed at 120° intervals around the circumference. One end of the cyclone blade 602 is fixedly welded to the cyclone blade base plate 603, and then spirals upward and involutes inward. The three cyclone blades 602 form three inverted conical air inlets. The air inlets face the tangential rotating airflow, which can ensure that the tangential rotating airflow can enter the upper cyclone impeller 6 very evenly and smoothly. The airflow is then gently guided by the three spiral involute blades of the upper cyclone impeller 6 into axial airflow, which enters the upper movable exhaust pipe 2 and is then discharged. This results in minimal energy loss along the airflow path, low operating resistance, and less wear at the air inlet. Furthermore, the upper cyclone impeller 6 provides a certain degree of grading and filtration for the dust-laden airflow, helping to improve powder selection efficiency. The lower cyclone impeller 10 operates on the same principle.

[0071] In this embodiment, the upper shell 1 adopts a volute-shaped structure, and the bottom of the lower shell 7 is also provided with a sampling device 13.

[0072] In this embodiment, the worm gear jacks in the upper adjustment device 3 and the lower adjustment device 9, as well as the drive structure 1101 (which may be a motor) in the scraper device 11, are all connected to a power supply and a controller. The worm gear jacks and the drive structure 1101 can be controlled to work through the controller.

[0073] In this embodiment, the dust-laden airflow introduced tangentially through an air inlet is adjusted to a reasonable inlet velocity by the damper device 5, the upper adjustment device 3 adjusts the vertical position of the upper movable exhaust pipe 2, and the lower adjustment device 9 adjusts the vertical position of the lower movable exhaust pipe 8. After cyclone separation, the airflow is divided into two streams, which are further classified by the upper cyclone impeller 6 and the lower cyclone impeller 10. Micro and nano particles that meet the controlled particle size are evenly discharged along the upper and lower channels and captured by the downstream dust collector; fine powder particles larger than the controlled particle size settle to the bottom of the shell and are scraped to the discharge port area by the scraper device 11 and discharged.

[0074] The working principle of this embodiment is as follows: The dust-laden airflow (particle size < 15 μm), after preliminary classification by the ultrafine classifier, enters at high speed through the side air inlet 101 of the volute-shaped upper shell 1. It is tangentially introduced into the machine body by a smooth involute. Under the combined action of the downward pressure of the top cover of the upper shell 1 and the downward inclination angle of the air inlet 101, an airflow rotating at high speed around the central axis is formed in the machine body. Under the action of centrifugal force, the coarser fine powder (particle size > approximately 5 μm) is thrown towards the shell wall. After colliding with the shell wall, it loses kinetic energy and, under the action of gravity, the coarser dust particles settle downward to the bottom of the lower shell 7. The scraper device 11 installed at the bottom of the lower shell 7 rotates along the shaft of the classifier under the action of the drive sprocket 1102. The scraper plate 1109 slowly scrapes the fine powder that has settled to the bottom to the discharge port area for discharge. The airflow, initially treated by centrifugal force, is then drawn in by the negative pressure of the upper cyclone impeller 6 and the lower cyclone impeller 10, splitting into upper and lower airflows. The flow velocity slows down significantly, and the kinetic energy is sharply reduced. The airflow then enters tangentially through the three circumferentially distributed air inlets of the upper cyclone impeller 6 and the lower cyclone impeller 10. The three spiral involute blades of the upper cyclone impeller 6 and the lower cyclone impeller 10 gently guide the tangential rotating airflow into axial airflow. While being guided, the upper cyclone impeller 6 and the lower cyclone impeller 10 perform a second stage of grading and filtration on the initially treated dust-laden airflow. The treated fine powder airflow is discharged from the upper fixed exhaust pipe 304 and the lower fixed exhaust pipe 304, respectively. The fine powder particles (particle size < approximately 5μm) in the fine powder airflow are captured and collected by the dust collector in the subsequent process and stored as the final product. Figure 2 The arrows in the diagram indicate the direction of airflow.

[0075] The upper adjustment device 3 can adjust the upper movable exhaust pipe 2 to rise and fall within a certain range, thereby driving the upper cyclone impeller 6 to move up and down; the lower adjustment device 9 can adjust the lower movable exhaust pipe 8 to rise and fall within a certain range, thereby driving the lower cyclone impeller 10 to move up and down. The vertical positions of the upper and lower cyclone impellers 6 and 10 within the casing, as well as the distance between them, directly affect the pressure difference and internal wind speed within the machine, thus adjusting the specific surface area and particle size of the fine powder. The smaller the distance between the upper and lower cyclone impellers 6 and 10, and the lower the positions of the upper and lower cyclone impellers within the casing, the finer the micro-nano finished product. By adjusting the valve opening of the valve plate 501 on the side air inlet 101, the cross-sectional area of ​​the air inlet can be adjusted to control the initial wind speed of the dust-laden airflow entering the micro-nano classifier. The smaller the opening of the valve plate 501, the faster the inlet wind speed, the higher the dust collection efficiency, and the finer the micro-nano finished product.

[0076] The classification process of any air classifier can be simply divided into three stages: dispersion, classification, and collection. Dispersion is the prerequisite, classification is the core, and collection is the guarantee. The technology in this embodiment is based on this concept. The upstream process uses an ultrafine air classifier to pre-treat the dust, reducing the dust concentration. Then, the dust is further classified using the technology in this embodiment. Finally, the dust is captured and collected by the downstream dust collector, ultimately producing micro-nano particles with controlled particle sizes D97=5μm and D97=3μm.

[0077] This embodiment also provides a powder selection method based on a dual-channel, non-powered micro / nano powder classifier, including:

[0078] Adjustment steps:

[0079] The lifting actuators in the upper adjusting device 3 and the lower adjusting device 9 are energized; the upper adjusting device 3 adjusts the lifting of the upper movable exhaust pipe 2, thereby driving the upper cyclone impeller 6 to move up and down; the lower adjusting device 9 adjusts the lifting of the lower movable exhaust pipe 8, thereby driving the lower cyclone impeller 10 to move up and down; ultimately, the vertical positions of the upper cyclone impeller 6, the lower cyclone impeller 10, and the distance between the upper cyclone impeller 6 and the lower cyclone impeller 10 are adjusted; the smaller the distance between the upper cyclone impeller 6 and the lower cyclone impeller 10, and the lower the positions of the upper cyclone impeller 6 and the lower cyclone impeller 10 within the upper and lower housings 7, the finer the final micro-nano finished product;

[0080] The valve opening of the valve plate 501 at the side air inlet 101 of the upper housing 1 is adjusted by adjusting the adjusting nut 506 in the damper device 5, so as to adjust the cross-sectional area of ​​the air inlet and control the initial wind speed of the dust-laden airflow entering the upper housing 1. The smaller the opening of the valve plate 501, the faster the wind speed at the air inlet 101, the higher the dust collection efficiency, and the finer the micro-nano finished product.

[0081] Selection steps:

[0082] After preliminary classification, the dust-laden airflow enters at high speed through the side air inlet 101 of the upper shell 1. It is tangentially introduced into the upper shell 1 by the smooth involute at the air inlet 101. Under the combined action of the downward pressure at the top of the upper shell 1 and the downward tilt angle of the air inlet 101, an airflow rotating at high speed around the central axis is formed in the upper shell 1 and the lower shell 7. Under the action of centrifugal force, the coarser fine powder is thrown to the inner wall of the upper shell 1 and the lower shell 7. After colliding with the inner wall, it loses kinetic energy. Under the action of gravity, the coarser fine powder settles down to the bottom of the lower shell 7.

[0083] When the scraping device 11 installed at the bottom of the lower housing 7 is powered on, the drive structure 1101 in the scraping device 11 drives the scraper 1109 to rotate along the shaft of the classifier. The scraper 1109 slowly scrapes the coarser fine powder material that has settled at the bottom of the lower housing 7 to the discharge port for discharge.

[0084] The airflow, initially treated by centrifugal force, is then drawn in by the negative pressure of the upper cyclone impeller 6 and the lower cyclone impeller 10, resulting in an upper airflow and a lower airflow. The airflow velocity decreases, and the upper airflow enters tangentially through multiple circumferentially distributed air inlets of the upper cyclone impeller 6, while the lower airflow enters tangentially through multiple circumferentially distributed air inlets of the lower cyclone impeller 10. The three spirally opening cyclone blades 602 of the upper and lower cyclone impellers 6 and 10 gently guide the tangentially rotating airflow into an axial airflow. Simultaneously, the upper and lower cyclone impellers 6 and 10 perform a second stage of filtration on the initially treated dust-laden airflow. The treated fine powder airflow is discharged from the upper movable exhaust pipe 2 and the lower movable exhaust pipe 8, respectively. The fine powder particles in the airflow are captured and collected by the dust collector in the subsequent process and stored as the final product.

[0085] The scope of protection of this invention includes, but is not limited to, the above embodiments. The scope of protection of this invention is defined by the claims. Any substitutions, modifications, or improvements to this technology that are easily conceived by those skilled in the art fall within the scope of protection of this invention.

Claims

1. A dual-channel, non-powered micro / nano powder classifier, characterized in that, It includes an upper housing (1), an upper movable exhaust pipe (2), an upper adjustment device (3), an upper cyclone impeller (6), a lower housing (7), a lower movable exhaust pipe (8), a lower adjustment device (9), and a lower cyclone impeller (10). The upper housing (1) is provided with an air inlet (101) on the side, and an upper exhaust port is provided at the center of the top of the upper housing (1). The upper movable exhaust pipe (2) is inserted into the upper housing (1) from the upper exhaust port downwards, and the upper movable exhaust pipe (2) is sealed and slidably connected to the upper exhaust port. The top of the lower housing (7) is connected to the bottom of the upper housing (1). The bottom center of the lower housing (7) is provided with a lower exhaust port, and a discharge port is provided on one side of the bottom. The lower movable exhaust pipe (8) is inserted into the lower housing (7) from the lower exhaust port. The lower movable exhaust pipe (8) is in a sealed sliding connection with the lower exhaust port. The upper movable exhaust pipe (2) is connected to an upper adjustment device (3) for driving the upper movable exhaust pipe (2) to slide up and down, and the lower end of the upper movable exhaust pipe (2) is connected to an upper cyclone impeller (6). The lower movable exhaust pipe (8) is connected to a lower adjustment device (9) for driving the lower movable exhaust pipe (8) to slide up and down, and the upper end of the lower movable exhaust pipe (8) is connected to a lower cyclone impeller (10). The upper adjustment device (3) and the lower adjustment device (9) have the same structure, both including a guide rod (301), a support frame (302), a fixed exhaust pipe (304), and a lifting and lowering actuator; In the upper adjustment device (3), the support frame (302) is connected to the top of the upper shell (1), one end of the fixed exhaust pipe (304) is located inside the upper movable exhaust pipe (2) and the upper movable exhaust pipe (2) is slidably connected to the fixed exhaust pipe (304), the fixed exhaust pipe (304) is connected to the support frame (302), a scale (305) is provided on the support frame (302), the guide rod (301) is connected to the upper shell (1), the upper movable exhaust pipe (2) is slidably connected to the guide rod (301), the upper movable exhaust pipe (2) is provided with a pointer (306) pointing to the scale (305), the lifting and lowering actuator is connected to the upper movable exhaust pipe (2) and the lifting and lowering actuator is used to drive the upper movable exhaust pipe (2) to slide up and down.

2. The dual-channel non-powered micro / nano powder classifier according to claim 1, characterized in that, In the lower adjustment device (9), the support frame (302) is connected to the bottom of the lower housing (7), one end of the fixed exhaust pipe (304) is located inside the lower movable exhaust pipe (8) and the lower movable exhaust pipe (8) is slidably connected to the fixed exhaust pipe (304), the fixed exhaust pipe (304) is fixedly connected to the support frame (302), a scale (305) is provided on the support frame (302), the guide rod (301) is connected to the lower housing (7), the lower movable exhaust pipe (8) is slidably connected to the guide rod (301), the lower movable exhaust pipe (8) is provided with a pointer (306) pointing to the scale (305), the lifting and lowering actuator is connected to the lower movable exhaust pipe (8) and the lifting and lowering actuator is used to drive the lower movable exhaust pipe (8) to slide up and down.

3. The dual-channel non-powered micro / nano powder classifier according to claim 2, characterized in that, The upper adjustment device (3) and the lower adjustment device (9) each have two lifting and lowering actuators, and the lifting and lowering actuators adopt worm gear lifts (4). In the upper adjustment device (3), the lead screws (401) in the two worm gear jacks (4) are threadedly connected to the end flanges (309) of the upper movable exhaust pipe (2); one end of the guide rod (301) is fixedly connected to the end flange (309) of the upper exhaust port, and the other end of the guide rod (301) is fixedly connected to the end flange (309) of the fixed exhaust pipe (304); the end flange (309) of the upper exhaust port is slidably connected to the outer wall of the upper movable exhaust pipe (2) through a sealing element (303); the end flange (309) of the upper movable exhaust pipe (2) is slidably connected to the outer wall of the fixed exhaust pipe (304) through a sealing element (303); In the lower adjustment device (9), the lead screws (401) in the two worm gear jacks (4) are threadedly connected to the end flanges (309) of the lower movable exhaust pipe (8); one end of the guide rod (301) is fixedly connected to the end flange (309) of the lower exhaust port, and the other end of the guide rod (301) is fixedly connected to the end flange (309) of the fixed exhaust pipe (304); the end flange (309) of the lower exhaust port is slidably connected to the outer wall of the lower movable exhaust pipe (8) through a sealing element (303); the end flange (309) of the lower movable exhaust pipe (8) is slidably connected to the outer wall of the fixed exhaust pipe (304) through a sealing element (303).

4. The dual-channel non-powered micro / nano powder classifier according to claim 1, characterized in that, The bottom inner side of the lower housing (7) is provided with a scraping device (11), which is used to scrape fine powder particles to the discharge port for discharge.

5. The dual-channel non-powered micro / nano powder classifier according to claim 4, characterized in that, The scraping device (11) includes a drive structure (1101), a transmission sprocket (1102), tapered rollers (1103), spherical balls (1106), an annular track (1107), a support ring (1108), and a scraper plate (1109). The annular track (1107) is horizontally fixed to the inner wall of the lower housing (7). The support ring (1108) is slidably connected to the annular track (1107) through the spherical balls (1106). Several tapered rollers (1103) are evenly spaced and connected to the support ring (1108), and mesh with the transmission sprocket (1102) to drive the scraper. The structure (1101) is fixedly connected to the outer wall of the lower housing (7). The output end (1110) of the drive structure (1101) passes through the lower housing (7) and is connected to the transmission sprocket (1102) inside the lower housing (7). The scraper (1109) is fixedly connected to the lower part of the support ring (1108). The scraper (1109) contacts the inner bottom wall of the lower housing (7). The inner wall of the lower housing (7) is also connected to a dust cover (15) for shielding the scraper device (11). The lower movable exhaust pipe (8) is located in the inner through hole of the dust cover (15) and the support ring (1108). The discharge port is connected to the discharge pipe (12). The drive structure (1101) is used to drive the transmission sprocket (1102) to rotate. The transmission sprocket (1102) drives the support ring (1108) to rotate through the conical roller (1103). The support ring (1108) drives the scraper (1109) to rotate. The scraper (1109) scrapes the fine powder particles to the discharge port and then discharges them from the discharge pipe (12).

6. The dual-channel non-powered micro / nano powder classifier according to claim 1, characterized in that, The air inlet (101) is provided with a damper device (5) for adjusting the cross-sectional area of ​​the air inlet duct.

7. The dual-channel non-powered micro / nano powder classifier according to claim 6, characterized in that, The damper device (5) includes a valve plate (501), a guide sleeve (502), a pin (503), a bracket (504), an adjusting screw (505), and an adjusting nut (506). The valve plate (501) is rotatably connected to the inner wall of the air inlet (101) of the upper housing (1) via the pin (503). The bracket (504) is fixedly connected to the outer wall of the air inlet (101) of the upper housing (1). One end of the adjusting screw (505) is rotatably connected and slidably connected to the strip hole in the middle of the valve plate (501). The other end passes through the reserved hole on the side wall of the air inlet (101), the guide sleeve (502) fixedly connected to the outside of the reserved hole, and the center hole of the bracket (504) in sequence, and is threadedly connected to the adjusting nut (506). One end of the adjusting nut (506) is embedded in the inner side of the bracket (504) and can rotate circumferentially inside the bracket (504).

8. The dual-channel non-powered micro / nano powder classifier according to claim 1, characterized in that, The upper cyclone impeller (6) and the lower cyclone impeller (10) are symmetrically arranged, and each includes a flow stabilizing ring (601), cyclone blades (602) and a plum blossom-shaped cyclone blade base plate (603); multiple cyclone blades (602) are arranged between the flow stabilizing ring (601) and the cyclone blade base plate (603) and are evenly distributed along the circumference; the top of one side of the cyclone blade (602) is fixedly connected to the flow stabilizing ring (601), and the bottom is fixedly connected to the cyclone blade base plate (603); the cyclone blade (602) spirals upward and gradually extends towards the inside of the flow stabilizing ring (601); the top of the other side of the cyclone blade (602) is located inside the flow stabilizing ring (601) and is suspended, and the bottom is fixedly connected to the cyclone blade base plate (603); Each of the cyclone blades (602) has three blades, which are evenly distributed at 120° intervals in the circumference, and an air inlet is formed between two adjacent cyclone blades (602).

9. A powder selection method for a dual-channel, non-powered micro / nano powder classifier according to claim 1, characterized in that, include: Adjustment steps: The lifting actuators in the upper adjusting device (3) and the lower adjusting device (9) are energized and put into operation; The upper adjustment device (3) adjusts the upper movable exhaust pipe (2) to rise and fall, thereby driving the upper cyclone impeller (6) to move up and down; the lower adjustment device (9) adjusts the lower movable exhaust pipe (8) to rise and fall, thereby driving the lower cyclone impeller (10) to move up and down; finally, the upper and lower positions of the upper cyclone impeller (6) in the upper shell (1) and the lower shell (7), the upper and lower positions of the lower cyclone impeller (10) in the upper shell (1) and the lower shell (7), and the size of the distance between the upper cyclone impeller (6) and the lower cyclone impeller (10) are adjusted; the smaller the distance between the upper cyclone impeller (6) and the lower cyclone impeller (10), and the lower the position of the upper cyclone impeller (6) and the lower cyclone impeller (10) in the upper shell (1) and the lower shell (7), the finer the final micro-nano finished product is obtained; Selection steps: After preliminary classification, the dust-laden airflow enters at high speed from the side air inlet (101) of the upper shell (1). It is tangentially introduced into the upper shell (1) by the smooth involute at the air inlet (101). Under the combined action of the downward pressure at the top of the upper shell (1) and the downward tilt angle of the air inlet (101), an airflow rotating at high speed around the central axis is formed in the upper shell (1) and the lower shell (7). Under the action of centrifugal force, the coarser fine powder is thrown to the inner wall of the upper shell (1) and the lower shell (7). After colliding with the inner wall, it loses kinetic energy. Under the action of gravity, the coarser fine powder sinks to the bottom of the lower shell (7) and is discharged from the discharge port. The airflow, which has been pre-treated by centrifugal force, is drawn in by the negative pressure of the upper cyclone impeller (6) and the lower cyclone impeller (10), and is divided into an upper airflow and a lower airflow. The airflow speed slows down. The upper airflow enters tangentially into the multiple air inlets evenly distributed around the circumference of the upper cyclone impeller (6), and the lower airflow enters tangentially into the multiple air inlets evenly distributed around the circumference of the lower cyclone impeller (10). The three spirally opening cyclone blades (602) of the upper cyclone impeller (6) and the lower cyclone impeller (10) gently guide the tangential rotating airflow into an axial airflow. While being guided, the upper cyclone impeller (6) and the lower cyclone impeller (10) perform a second stage of grading and filtration on the pre-treated dust-laden airflow. The treated fine powder airflow is discharged from the upper movable exhaust pipe (2) above and the lower movable exhaust pipe (8) below. The fine powder particles in the fine powder airflow are captured and collected by the dust collector in the subsequent process and stored as the final product.

10. The powder selection method of the dual-channel non-powered micro / nano powder classifier according to claim 9, characterized in that: The adjustment steps also include: Adjust the valve opening of the valve plate (501) at the side air inlet (101) of the upper housing (1) by adjusting the adjusting nut (506) in the damper device (5), thereby adjusting the cross-sectional area of ​​the air inlet and controlling the initial wind speed of the dust-laden airflow entering the upper housing (1). The smaller the opening of the valve plate (501), the faster the wind speed at the air inlet (101), the higher the dust collection efficiency, and the finer the micro-nano finished product. The powder selection process also includes: The scraper device (11) installed at the bottom of the lower housing (7) is powered on. The drive structure (1101) in the scraper device (11) drives the scraper plate (1109) to rotate along the shaft of the classifier. The scraper plate (1109) slowly scrapes the coarser fine powder material that has settled at the bottom of the lower housing (7) to the discharge port for discharge.

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