Particle size grading screening device for high-purity aluminum powder production

Abstract

The invention discloses a size grading and screening device for high-purity aluminum powder production, and relates to the technical field of aluminum powder size grading and screening, the size grading and screening device comprises a screening mechanism, the screening mechanism comprises a screening box, the bottom surface of the screening box is an inclined surface, and the outer surface of the screening box is fixedly connected with two supporting legs; the size grading screening device comprises a screening box, the upper surface of the screening box fixedly communicates with a feeding cover, two screens are arranged in the screening box, and the two screens are inclined at a certain angle. According to the size grading screening device for high-purity aluminum powder production, iron impurities in aluminum powder can be rapidly and effectively removed in the size grading screening process of the aluminum powder; according to the particle size grading screening device for the aluminum powder production, aluminum powder particles mixed with iron impurities cannot be mixed into pure aluminum particles with the same particle size, the purity of aluminum powder is effectively improved, the particle size grading screening device for the aluminum powder production has the iron impurity removing function, the quality of the aluminum powder obtained after grading screening is guaranteed, and the screening effect of the particle size grading screening device for the aluminum powder production on the aluminum powder is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum powder particle size classification and screening, in particular to a particle size classification and screening device for producing high-purity aluminum powder. Background Art

[0002] Aluminum powder has the characteristics of light weight, high buoyancy, strong covering power and good reflective properties to light and heat. Aluminum powder can be used to identify fingerprints and make fireworks. Aluminum powder is widely used in industrial production and processing due to its wide range of uses, large demand and many varieties. In order to ensure the quality of aluminum powder during use, after the aluminum powder is processed, it is usually necessary to use a grading screening device to screen out aluminum powder of different particle sizes, and then produce high-purity aluminum powder of the same particle size to meet higher product processing and production needs.

[0003] When in use, the existing particle size grading and screening device for aluminum powder production can only screen the particle size of aluminum powder through structures such as filter screens, and cannot remove iron impurities in the aluminum powder during the screening process, so that aluminum powder particles mixed with iron impurities will also be mixed into pure aluminum particles of the same size, which affects the purity of the aluminum powder to a certain extent, making it easy for the aluminum powder to have insufficient quality problems due to excessive internal iron impurities when used subsequently. At the same time, it also reduces the screening effect and use effect of the particle size grading and screening device for aluminum powder production on high-purity aluminum powder.

[0004] Combining the above problems, we will find that it is difficult to avoid the above problems at the same time when using the existing particle size grading and screening devices for aluminum powder production, and even if they can be solved, they need to be solved through external tools, which makes it impossible to achieve the desired effect. Therefore, we propose a particle size grading and screening device for the production of high-purity aluminum powder. Summary of the invention

[0005] The object of the present invention is to provide a particle size grading and screening device for producing high-purity aluminum powder to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a particle size classification and screening device for producing high-purity aluminum powder, comprising a screening mechanism, the screening mechanism comprising a screening box, the bottom surface of the screening box is an inclined surface, the outer surface of the screening box is fixedly connected to two supporting legs, the upper surface of the screening box is fixedly connected to a feeding cover, two screens are arranged inside the screening box, both of the two screens are at a certain inclination angle, the left side of the screening box is fixedly connected to three discharge covers, and the screening box is provided with a rejection mechanism inside; The rejecting mechanism comprises an aluminum powder purification unit, which is arranged inside the screening box and is used to remove iron impurities in the aluminum powder during the aluminum powder screening process; The rejection mechanism further includes an impurity discharge unit, which is disposed inside the screening box and is used to discharge iron impurities from the inside of the screening box to the outside; The rejection mechanism also includes a secondary cleaning unit, which is arranged inside the impurity discharge unit and is used to perform secondary cleaning and collection on residual iron impurities in the filtered aluminum powder; a collecting mechanism is provided at the bottom end of the impurity discharge unit, which is used in conjunction with the rejection mechanism and is used to collect iron impurities discharged by the impurity discharge unit.

[0007] Preferably, the aluminum powder purification unit comprises two rotating cylinders, both of which are rotatably connected to the inside of a screening box, and both of which are arranged between two screens. A first guide frame is fixedly connected to the inner wall of the screening box, and the first guide frame is arranged above the two rotating cylinders. A second guide frame is fixedly connected to the inner wall of the screening box, and the second guide frame is arranged below the two rotating cylinders. Two fixed cylinders are fixedly connected to both side surfaces of the screening box, and a sealed bearing is fixedly connected to the inner wall of each fixed cylinder, and the inner wall of each sealed bearing inner ring is fixedly connected to the outer surface of the rotating cylinder. A rotating gear is fixedly connected to the left end of the two rotating cylinders, and the outer surfaces of the two rotating gears are meshed with each other. A rotating motor is arranged on the left side of the screening box, and the output end of the rotating motor is fixedly connected to the left end of one of the rotating gears. The inner walls of the two rotating cylinders are fixedly connected to fixed frames, and the outer surfaces of the two fixed frames are fixedly connected to a plurality of arc-shaped permanent magnets, and the outer surfaces of the plurality of arc-shaped permanent magnets are in contact with the inner wall of the rotating cylinder.

[0008] Preferably, the inner wall of the screening box is fixedly connected to two stabilizing frames, the two stabilizing frames are both inclined at a certain angle, the outer surfaces of the two screens are fixedly connected to fixing frames, the outer surfaces of the two fixing frames are fixedly connected to a plurality of vibration springs, the other ends of the plurality of vibration springs are fixedly connected to the inner wall of the stabilizing frame, the bottom surfaces of the two fixing frames are fixedly connected to vibration motors, the outer surfaces of the two fixing frames are fixedly connected to rubber sleeves, and the outer surfaces of the two rubber sleeves are respectively fixedly connected to the inner walls of the two stabilizing frames.

[0009] Preferably, a stabilizing seat is fixedly connected to the bottom surface of the rotating motor, and the right side surface of the stabilizing seat is fixedly connected to the left side surface of the screening box.

[0010] Preferably, the impurity discharge unit comprises two discharge racks, the two discharge racks are respectively arranged under the two rotating drums, the right sides of the two discharge racks are fixedly connected to the inner side walls of the screening box, the upper surfaces of the two discharge racks are fixedly connected to two shielding plates, each of the shielding plates is inclined at a certain angle, plastic scrapers are arranged inside the two discharge racks, the inner walls of the two plastic scrapers are respectively in contact with the outer surfaces of the two rotating drums, a plurality of limiting cylinders are arranged on the inner walls of the two discharge racks, the outer surfaces of the plurality of limiting cylinders are fixedly connected to two fixing columns, the other end of each fixing column is fixedly connected to the inner wall of the discharge rack, the inner walls of the plurality of limiting cylinders are slidably connected with telescopic cylinders, the top ends of the plurality of telescopic cylinders are fixedly connected to the bottom surfaces of the plastic scrapers, the inner bottom walls of the plurality of limiting cylinders are fixedly connected with compression springs, the top ends of each compression springs are fixedly connected to the bottom surfaces of the plastic scrapers, the right sides of the two discharge racks are fixedly connected with discharge The two cams are connected by a pair of threading means, each of which has a first end fixed to the side panel that is provided with a second end, and a second end of the threading means is connected to the side panel that is provided with a second end.

[0011] Preferably, the secondary cleaning unit includes a reciprocating screw fixedly arranged at both ends of the top of the second guide frame, the left end of the reciprocating screw and the left end of the spiral shaft on the same side are fixedly connected to a transmission wheel, the two transmission wheels are transmission-connected with a transmission belt, the reciprocating screw is threadedly connected to a slider, one end of the slider is fixedly connected to a double-head scraper, both sides of the inside of the second guide frame are fixedly connected to electromagnets, both sides of the second guide frame are symmetrically fixedly connected to temporary storage boxes, a conveying pipe is arranged in the temporary storage box, the conveying pipe passes through the second guide frame and the side walls of the screening box, the two sides of the screening box are detachably connected to storage boxes, and the ends of the conveying pipe are located inside the storage boxes.

[0012] Preferably, the collecting mechanism comprises two clamping frames, the left sides of the two clamping frames are fixedly connected to the right side of the screening box, frame-type demagnetizers are arranged on the top of the two clamping frames, the two frame-type demagnetizers are respectively arranged on the outside of the two discharge pipes, the inside of the two clamping frames are clamped with collecting boxes, the outer surfaces of the two collecting boxes are fixedly connected with two symmetrical clamping strips, each of the clamping strips is clamped to the inside of the two clamping frames, the inner wall of each of the clamping strips is clamped with a positioning pin, and the bottom end of each of the positioning pins penetrates to the clamping frame. Below, the upper surfaces of the two collecting boxes are fixedly connected with positioning frames, the outer surfaces of the two discharging barrels are fixedly connected with closing frames, the two positioning frames are respectively clamped in the interior of the two closing frames, the upper surfaces of the two positioning frames are respectively in contact with the bottom surfaces of the two discharging barrels, the interiors of the two closing frames are slidably connected with closing plates, the right sides of the two closing plates are respectively in contact with the left sides of the two positioning frames, the left sides of the two closing plates are fixedly connected with two push springs, and the other end of each push spring is fixedly connected to the inner wall of the closing frame.

[0013] Preferably, the bottom surfaces of the two frame-type demagnetizers are commonly fixedly connected with a bearing plate, and the left side surface of the bearing plate is fixedly connected to the right side surface of the screening box.

[0014] Preferably, the bottom surfaces of the two closed frames are fixedly connected to the support frames, and the bottom surfaces of the two support frames are fixedly connected to the upper surface of the clamping frame.

[0015] Preferably, a telescopic rod is provided on the inner wall of each push spring, a telescopic end of each telescopic rod is fixedly connected to the left side surface of the closing plate, and the other end of each telescopic rod is fixedly connected to the inner wall of the closing frame.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention, by providing an aluminum powder purification unit, can utilize the rotation of the rotating drum in conjunction with the magnetic force of the arc-shaped permanent magnet to quickly and effectively remove iron impurities in the aluminum powder during the aluminum powder particle size grading and screening process, so that aluminum powder particles mixed with iron impurities will not be mixed into pure aluminum particles of the same size, thereby effectively increasing the purity of the aluminum powder, enabling the particle size grading and screening device for aluminum powder production to have the function of removing iron impurities, thereby ensuring the quality of the aluminum powder after grading and screening, and improving the screening effect of the particle size grading and screening device for aluminum powder production on aluminum powder.

[0017] 2. The present invention provides an impurity discharge unit, which can use a plastic scraper to scrape the iron impurities adsorbed on the rotating drum into the discharge frame, and discharge the iron impurities from the discharge frame to the outside through the rotation of the spiral shaft, thereby preventing the iron impurities from accumulating in the screening box and causing secondary pollution to the screened aluminum powder. It ensures that the iron impurities in the aluminum powder are removed smoothly and that the iron impurities can be discharged smoothly, thereby further ensuring the effect of iron impurity removal.

[0018] 3. The present invention provides a secondary cleaning unit, which can utilize the rotation of the spiral shaft to drive the reciprocating screw to rotate, and then drive the slider and the double-headed scraper to move back and forth, so as to perform secondary cleaning on the aluminum powder that falls into the second guide frame and has been removed of iron impurities by the arc-shaped permanent magnet, thereby cleaning the residual iron impurities in the aluminum powder to improve the purity of the aluminum powder, and then collecting the cleaned residual iron impurities.

[0019] 4. The present invention can smoothly collect the discharged iron impurities by setting up a collecting mechanism. At the same time, the sealing of the closing frame and the closing plate can prevent the aluminum powder containing iron impurities from leaking out when the collecting box is replaced, making it difficult for the aluminum powder containing iron impurities to leak out through the discharge barrel, thereby increasing the safety and convenience of the collecting box for collecting aluminum powder containing iron impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic cross-sectional view of the screening box of the present invention; Figure 3 It is a partial structural explosion diagram of the aluminum powder purification unit of the present invention; Figure 4 It is a structural schematic diagram of the first guide frame of the present invention; Figure 5 It is a schematic cross-sectional structural diagram of the rotating drum of the present invention; Figure 6 It is a structural schematic diagram of the frame type demagnetizer of the present invention; Figure 7 It is a schematic cross-sectional structural diagram of the discharge rack of the present invention; Figure 8 It is a schematic cross-sectional view of the limiting cylinder and the telescopic cylinder of the present invention; Fig. 9 It is a structural schematic diagram of the card-joint frame of the present invention; Fig.10 It is a structural schematic diagram of the collection box of the present invention; Fig.11 It is a cross-sectional structural schematic diagram of the closing frame and the discharging barrel of the present invention; Fig.12 It is a structural schematic diagram of the secondary cleaning unit of the present invention; Fig.13 It is a cross-sectional structural diagram of the second guide frame of the present invention.

[0021] In the figure: 1. screening mechanism; 11. screening box; 12. supporting legs; 13. feeding cover; 14. screen; 15. discharging cover; 2. rejecting mechanism; 21. aluminum powder purification unit; 2101. rotating cylinder; 2102. first guide frame; 2103. second guide frame; 2104. fixed cylinder; 2105. sealed bearing; 2106. rotating gear; 2107. rotating motor; 2108. fixed frame; 2109. arc permanent magnet; 2110. stable frame; 2111. fixed frame; 2112. vibration spring; 2113. vibration motor; 2114. rubber sleeve; 2115. stable seat; 22. impurity discharge unit; 2201. discharge frame; 2202. shielding plate; 2203. plastic scraper; 2204. limiting cylinder; 2205. fixed column; 2206. compression spring; 2207. telescopic cylinder ; 2208, discharge pipe; 2209, screw shaft; 2210, mounting frame; 2211, reducer; 2212, first pulley; 2213, second pulley; 2214, belt; 2215, discharge barrel; 2216, bearing seat; 23, secondary cleaning unit; 2301, reciprocating screw; 2302, transmission wheel; 2303, transmission belt; 2304, slider; 2305, electromagnet; 23 06. Double-head scraper; 2307. Temporary storage box; 2308. Delivery pipe; 2309. Storage box; 3. Collection mechanism; 301. Snap-on frame; 302. Frame demagnetizer; 303. Collection box; 304. Snap-on strip; 305. Positioning pin; 306. Positioning frame; 307. Closing frame; 308. Closing plate; 309. Push spring; 310. Loading plate; 311. Support frame; 312. Telescopic rod. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1: Please refer to Figure 1-Figure 5The present invention provides a technical solution: a particle size grading and screening device for producing high-purity aluminum powder, comprising a screening mechanism 1, the screening mechanism 1 comprising a screening box 11, the bottom surface of the screening box 11 is an inclined surface, the outer surface of the screening box 11 is fixedly connected to two supporting legs 12, the upper surface of the screening box 11 is fixedly connected to a feeding cover 13, two screens 14 are arranged inside the screening box 11, the two screens 14 are both inclined at a certain angle, the pores of the lower screen 14 are smaller than the pores of the upper screen 14, and the grading and screening of aluminum powders of different particle sizes can be achieved by using two screens 14 with different pores, the left side of the screening box 11 is fixedly connected to three discharge covers 15, and the screening box 11 is provided with a rejection mechanism 2 inside; The rejecting mechanism 2 includes an aluminum powder purification unit 21, which is arranged inside the screening box 11. The aluminum powder purification unit 21 is used to remove iron impurities in the aluminum powder during the aluminum powder screening process.

[0024] As a further limitation of the rejection mechanism 2 of the present invention, the aluminum powder purification unit 21 includes two rotating cylinders 2101, the two rotating cylinders 2101 are rotatably connected to the inside of the screening box 11, the two rotating cylinders 2101 are arranged between the two screens 14, the inner wall of the screening box 11 is fixedly connected with a first guide frame 2102, the first guide frame 2102 is arranged above the two rotating cylinders 2101, the inner wall of the screening box 11 is fixedly connected with a second guide frame 2103, the second guide frame 2103 is arranged below the two rotating cylinders 2101, the two side surfaces of the screening box 11 are fixedly connected with two fixed cylinders 2104, the inner wall of each fixed cylinder 2104 is fixedly connected with a sealed bearing 2105, the inner wall of the inner ring of each sealed bearing 2105 is fixedly connected to the outer surface of the rotating cylinder 2101, the left ends of the two rotating cylinders 2101 are fixedly connected with a rotating gear 2106, the outer surfaces of the two rotating gears 2106 are meshed with each other, and the sieves are fixedly connected to the inner wall of the two rotating cylinders 2101. A rotating motor 2107 is provided on the left side of the selection box 11, and the output end of the rotating motor 2107 is fixedly connected to the left end of one of the rotating gears 2106. The inner walls of the two rotating cylinders 2101 are fixedly connected with fixed frames 2108, and the outer surfaces of the two fixed frames 2108 are fixedly connected with a plurality of arc-shaped permanent magnets 2109, and the outer surfaces of the plurality of arc-shaped permanent magnets 2109 are in contact with the inner wall of the rotating cylinder 2101. By providing the aluminum powder purification unit 21, the rotation of the rotating cylinder 2101 and the magnetic force of the arc-shaped permanent magnets 2109 can be used to quickly and effectively remove iron impurities in the aluminum powder during the aluminum powder particle size grading and screening process, so that aluminum powder particles mixed with iron impurities will not be mixed into pure aluminum particles of the same particle size, effectively increasing the purity of the aluminum powder, so that the particle size grading and screening device for aluminum powder production has the function of removing iron impurities, ensuring the quality of the aluminum powder after grading and screening, and improving the screening effect of the particle size grading and screening device for aluminum powder production on aluminum powder; The inner wall of the screening box 11 is fixedly connected to two stable frames 2110, and the two stable frames 2110 are both at a certain inclination angle. The outer surfaces of the two screens 14 are fixedly connected to fixed frames 2111, and the outer surfaces of the two fixed frames 2111 are fixedly connected to a plurality of vibration springs 2112, and the other ends of the plurality of vibration springs 2112 are fixedly connected to the inner wall of the stable frames 2110. The bottom surfaces of the two fixed frames 2111 are fixedly connected to vibration motors 2113, and the outer surfaces of the two fixed frames 2111 are fixedly connected to rubber sleeves 2114, and the outer surfaces of the two rubber sleeves 2114 are respectively connected to the inner walls of the two stable frames 2110. The fixing frame 2111 and the screen 14 are fixedly connected to the wall, and the vibration force provided by the vibration motor 2113 cooperates with the vibration amplification of the fixing frame 2110 and the vibration spring 2112 to drive the fixing frame 2111 and the screen 14 to vibrate, and then the aluminum powder falling on the screen 14 is graded and screened by the vibration, so that the aluminum powder of different particle sizes can be discharged outward through the discharge cover 15 and the slope of the screen 14 after being graded by the screen 14. The rubber sleeve 2114 can be used to close the gap between the fixing frame 2111 and the fixing frame 2110 without affecting the smooth vibration of the fixing frame 2111, so as to prevent the unscreened aluminum powder from falling downward through the gap; The bottom surface of the rotating motor 2107 is fixedly connected with a stabilizing seat 2115, and the right side of the stabilizing seat 2115 is fixedly connected to the left side of the screening box 11. The stabilizing seat 2115 can fix the position of the rotating motor 2107 to ensure that the rotating motor 2107 can run smoothly.

[0025] The specific implementation method of this embodiment is as follows: when in use, first connect the rotating motor 2107 and the vibration motor 2113 to the external power supply and the controller. When the aluminum powder needs to be graded and screened, the aluminum powder only needs to be added into the screening box 11 through the feeding cover 13. At this time, the aluminum powder will fall on the upper screen 14. Then, the vibration force provided by the upper vibration motor 2113 is combined with the vibration amplification of the upper stabilizing frame 2110 and the upper vibration spring 2112 to drive the upper fixed frame 2111 and the upper screen 14 to vibrate, and then the vibration is used to grade and screen the aluminum powder that falls on the upper screen 14, so that aluminum powders of different particle sizes can be graded by the upper screen 14 and then discharged through the upper discharge cover 15 and the inclined surface of the upper screen 14. The aluminum powder is discharged outwardly at a certain degree, and the rubber sleeve 2114 can be used to close the gap between the fixed frame 2111 and the stable frame 2110 without affecting the smooth vibration of the fixed frame 2111, so as to prevent the unscreened aluminum powder from falling downward through the gap. After the aluminum powder passes through the upper screen 14 for a particle size classification and screening, it will fall into the interior of the first guide frame 2102. The first guide frame 2102 can be used to guide the aluminum powder to fall on the rotating cylinder 2101, ensuring that the aluminum powder and the rotating cylinder 2101 keep in contact. At this time, the magnetic force provided by the arc permanent magnet 2109 cooperates with the fixed frame 2108 to adsorb the aluminum powder containing iron impurities on the outer surface of the rotating cylinder 2101, and then the power provided by the rotating motor 2107 cooperates with the fixation of the stable seat 2115. The two rotating drums 2101 can be driven to rotate by rotating the gear 2106, so that the aluminum powder can better contact with the rotating drum 2101, so that the aluminum powder containing iron impurities can be better removed, and the aluminum powder particles containing iron impurities will not be mixed into the pure aluminum particles of the same size, which effectively increases the purity of the aluminum powder, so that the particle size grading and screening device for aluminum powder production has the function of removing iron impurities, ensures the quality of the aluminum powder after grading and screening, and improves the screening effect of the particle size grading and screening device for aluminum powder production on the aluminum powder. In addition, when the rotating drum 2101 rotates, the sealing bearing 2105 cooperates with the fixed drum 2104 to close the gap between the rotating drum 2101 and the screening box 11, so as to prevent the aluminum powder from leaking out through the gap, and at the same time, reduce the rotating drum 2 The friction between 101 and the screening box 11 improves the smoothness of the rotation of the rotating drum 2101, so that the rotating drum 2101 can better absorb the aluminum powder containing iron impurities. After the iron impurities are removed, the aluminum powder will fall on the lower screen 14 through the guidance of the second guide frame 2103. At this time, the vibration force provided by the lower vibration motor 2113 is combined with the vibration amplification of the lower stable frame 2110 and the lower vibration spring 2112 to drive the lower fixed frame 2111 and the lower screen 14 to vibrate, and then use the vibration to perform a second particle size classification and screening on the aluminum powder falling on the lower screen 14, so that the aluminum powder with smaller particle size can be discharged outward through the two lower discharge covers 15 and the slope of the lower screen 14 after being classified by the lower screen 14.

[0026] Example 2: Please refer to Figure 2 , Figure 4-Figure 8 The present invention provides a technical solution: a particle size grading and screening device for the production of high-purity aluminum powder. The present invention makes corresponding improvements to the technical problems mentioned in the background technology. The removal mechanism 2 also includes an impurity discharge unit 22, which is arranged inside the screening box 11. The impurity discharge unit 22 is used to discharge iron impurities from the inside of the screening box 11 to the outside.

[0027] As a further limitation of the rejection mechanism 2 of the present invention, the impurity discharge unit 22 includes two discharge racks 2201, the two discharge racks 2201 are respectively arranged below the two rotating cylinders 2101, the right sides of the two discharge racks 2201 are fixedly connected to the inner wall of the screening box 11, the upper surfaces of the two discharge racks 2201 are fixedly connected to two shielding plates 2202, each shielding plate 2202 is inclined at a certain angle, and the interiors of the two discharge racks 2201 are provided with plastic scrapers 2203, the plastic scrapers 2203 are made of polytetrafluoroethylene material, the inner walls of the two plastic scrapers 2203 are respectively in contact with the outer surfaces of the two rotating cylinders 2101, and the inner walls of the two discharge racks 2201 are provided with a plurality of limiting cylinders 220 4. The outer surfaces of several limiting cylinders 2204 are fixedly connected with two fixing columns 2205, and the other end of each fixing column 2205 is fixedly connected to the inner wall of the discharge frame 2201. The inner walls of several limiting cylinders 2204 are slidably connected with telescopic cylinders 2207, and the top ends of several telescopic cylinders 2207 are fixedly connected to the bottom surface of the plastic scraper 2203. The inner bottom walls of several limiting cylinders 2204 are fixedly connected with compression springs 2206, and the top end of each compression spring 2206 is fixedly connected to the bottom surface of the plastic scraper 2203. The right sides of the two discharge frames 2201 are fixedly connected with discharge pipes 2208, and the other ends of the two discharge pipes 2208 penetrate to the right side of the screening box 11. A spiral shaft 2209 is connected to the inside of the two discharge racks 2201 and is rotatably connected thereto. A mounting rack 2210 is provided above the two discharge pipes 2208. The left sides of the two mounting racks 2210 are fixedly connected to the right side of the screening box 11. The bottom surfaces of the two mounting racks 2210 are fixedly connected to reducers 2211. The input ends of the two reducers 2211 are respectively fixedly connected to the right ends of the two rotating cylinders 2101. The output ends of the two reducers 2211 are fixedly connected to the first pulley 2212. The left ends of the two spiral shafts 2209 pass through the discharge rack 2201 and are rotatably connected to the screening box 11. The right ends of the two spiral shafts 2209 pass through the discharge pipe 2208 and are fixedly connected to the second pulley 2213. The outer surface of a pulley 2212 is sleeved with a belt 2214, and the two first pulleys 2212 are transmission-connected to the second pulley 2213 through the belt 2214. The outer surfaces of the two discharge pipes 2208 are fixedly connected with a discharge cylinder 2215. By setting the impurity discharge unit 22, the plastic scraper 2203 can be used to scrape the iron impurities adsorbed on the rotating cylinder 2101 into the discharge rack 2201, and the iron impurities are discharged from the discharge rack 2201 through the rotation of the spiral shaft 2209, thereby preventing the iron impurities from accumulating in the screening box 11 and causing secondary pollution to the screened aluminum powder, thereby ensuring that the iron impurities in the aluminum powder are smoothly removed and the iron impurities can be smoothly discharged, further ensuring the removal effect of the iron impurities; The outer surfaces of the two first pulleys 2212 are rotatably connected to bearing seats 2216, and the left sides of the two bearing seats 2216 are fixedly connected to the right sides of the two mounting frames 2210 respectively. The bearing seats 2216 can increase the stability of the first pulley 2212 without affecting the normal rotation of the first pulley 2212, so that the first pulley 2212 is not prone to excessive shaking when rotating.

[0028] The specific implementation of this embodiment is as follows: when the rotating cylinder 2101 carrying aluminum powder containing iron impurities rotates, the fixing of the limiting cylinder 2204 by the fixing column 2205 and the elastic force provided by the telescopic cylinder 2207 inside the limiting cylinder 2204 and the compression spring 2206 can make the plastic scraper 2203 always keep in contact with the rotating cylinder 2101, and then with the rotation of the rotating cylinder 2101, the plastic scraper 2203 can be used to scrape off the aluminum powder containing iron impurities adsorbed on the rotating cylinder 2101 and make it fall into the discharge rack 2201, and at the same time, the baffle plate 2202 can be used to prevent the aluminum powder containing iron impurities from splashing outwards when scraped off, further reducing the pollution of pure aluminum particles, and also preventing the pure aluminum particles from falling into the discharge rack 2201, reducing the waste of pure aluminum particles, because the pure aluminum particles will not be attracted by the magnetic force and will not be adsorbed on the rotating cylinder 2101, so the pure aluminum particles can be removed from the rotating cylinder 2101 by the rotation of the rotating cylinder 2101. The two sides fall into the second guide frame 2103, and are guided by the second guide frame 2103 to fall on the lower screen 14 for secondary classification and screening. Then, the reducer 2211 is fixed by the mounting frame 2210, and the internal reduction gear of the reducer 2211 can be driven to rotate by the rotation of the rotating cylinder 2101. After the speed of the reducer 2211 is reduced, the first pulley 2212 can be driven to rotate under the limit of the bearing seat 2216, and then the spiral shaft 2209 can be driven to rotate inside the discharge frame 2201 through the belt 2214 and the second pulley 2213. The aluminum powder containing iron impurities in the discharge frame 2201 can be discharged outward through the discharge pipe 2208 and the discharge cylinder 2215 by the rotation of the spiral shaft 2209, so as to prevent the accumulation of iron impurities in the screening box 11 and cause secondary pollution to the screened aluminum powder. Then, while ensuring the smooth removal of iron impurities in the aluminum powder, the iron impurities can be smoothly discharged outward, further ensuring the removal effect of iron impurities.

[0029] Example 3: Please refer to Figure 1 , Figure 12-13 The present invention provides a technical solution: a particle size grading and screening device for the production of high-purity aluminum powder. The present invention makes corresponding improvements to the technical problems mentioned in the background technology. The removal mechanism 2 also includes a secondary cleaning unit 23, which is arranged inside the impurity discharge unit 22. The secondary cleaning unit 23 is used to clean and collect the residual iron impurities in the filtered aluminum powder again.

[0030] The secondary cleaning unit 23 includes a reciprocating screw rod 2301 fixedly arranged at both ends of the top of the second guide frame 2103, the left end of the reciprocating screw rod 2301 and the left end of the spiral shaft 2209 on the same side are fixedly connected with a transmission wheel 2302, and the two transmission wheels 2302 are connected with a transmission belt 2303, and the reciprocating screw rod 2301 is threadedly connected with a slider 2304, and one end of the slider 2304 is fixedly connected with a double-headed scraper 2306, and both sides of the second guide frame 2103 are fixedly connected with electromagnets 2305, and the electromagnets 2305 are electrically connected to an external power supply. The two sides of the second guide frame 2103 are symmetrically fixedly connected with temporary storage boxes 2307, and the temporary storage box 2307 is provided with a conveying Tube 2308, the conveying pipe 2308 passes through the second guide frame 2103 and the side wall of the screening box 11, and the two sides of the screening box 11 are detachably connected with storage boxes 2309. The end of the conveying pipe 2308 is located inside the storage box 2309. By setting up a secondary cleaning unit 23, the rotation of the screw shaft 2209 can be used to drive the reciprocating screw rod 2301 to rotate, and then drive the slider 2304 and the double-headed scraper 2306 to reciprocate, so as to perform secondary cleaning on the aluminum powder that falls into the second guide frame 2103 and has been removed of iron impurities by the arc permanent magnet 2109, and clean the residual iron impurities in the aluminum powder to improve the purity of the aluminum powder, and then collect the cleaned residual iron impurities.

[0031] Multiple stirring rods are symmetrically arranged on both sides of the double-headed scraper 2306. When the double-headed scraper 2306 moves back and forth, the stirring rods on both sides of the double-headed scraper 2306 will first stir the residual iron impurities adsorbed on the second guide frame 2103, and then release a small amount of aluminum powder mixed in the residual iron impurities, thereby increasing the output of aluminum powder and saving production costs.

[0032] The length of the stirring rod shortens from top to bottom. Since the inner surface of the second guide frame 2103 is inclined, when the upper stirring rod stirs the residual iron impurities, the aluminum powder mixed in it will slide downward along the inclined surface of the second guide frame 2103, and the lower stirring rod will not block it. When the lower stirring rod moves, it will stir the area below. This operation can perform multi-stage stirring of the residual iron impurities, effectively improving the purity and output rate of the aluminum powder, and further saving production costs.

[0033] The specific implementation of this embodiment is as follows: when the rotating motor 2107 is started, the electromagnet 2305 is energized to work, and then the residual iron impurities that fall into the second guide frame 2103 can be adsorbed by magnetic force, and the residual iron impurities in the aluminum powder are cleaned to improve the purity of the aluminum powder. When the screw shaft 2209 rotates, the screw shaft 2209 drives the transmission wheel 2302 to rotate, and then drives the reciprocating screw rod 2301 to rotate through the transmission belt 2303. The reciprocating screw rod 2301 drives the slider 2304 and the double-headed scraper 2306 to reciprocate. The double-headed scraper 2306 drives the arc-shaped permanent magnet that falls into the second guide frame 2103. 2109 removes the aluminum powder with iron impurities for secondary cleaning. When the double-headed scraper 2306 moves to one end of the second guide frame 2103, the double-headed scraper 2306 can collect the scraped residual iron impurities into the temporary storage box 2307, and then transport the residual iron impurities to the storage box 2309 through the conveying pipe 2308 arranged in the temporary storage box 2307. When the residual iron impurities in the storage box 2309 reach a certain level, the storage box 2309 can be removed from the screening box 11, and after the residual iron impurities in the storage box 2309 are discharged, the storage box 2309 can be installed on the screening box 11 to prepare for the subsequent collection of iron impurities.

[0034] Example 4: Please refer to Figure 2 , Figure 6 , Figure 9-11 The present invention provides a technical solution: a particle size grading and screening device for the production of high-purity aluminum powder. The present invention makes corresponding improvements to the technical problems mentioned in the background technology. A collecting mechanism 3 is provided at the bottom end of the impurity discharge unit 22. The collecting mechanism 3 is used in conjunction with the rejecting mechanism 2. The collecting mechanism 3 is used to collect iron impurities discharged by the impurity discharge unit 22.

[0035] As a further limitation of the collecting mechanism 3 of the present invention, the collecting mechanism 3 includes two clamping frames 301, the left sides of the two clamping frames 301 are fixedly connected to the right side of the screening box 11, and frame-type demagnetizers 302 are arranged above the two clamping frames 301. The two frame-type demagnetizers 302 are respectively arranged outside the two discharge pipes 2208. The frame-type demagnetizer 302 is a demagnetizer that continuously demagnetizes the workpiece. Because the demagnetizer itself has a frame opening, it is called a frame-type demagnetizer 302. The frame-type demagnetizer 302 is suitable for various tools, copper, iron and small-scale large-volume workpieces. After power is turned on, The demagnetization effect can be achieved by passing the workpiece through the middle hole of the frame demagnetizer 302. The frame demagnetizer 302 usually adopts an electromagnet with an open iron core and is passed with an alternating current of 50 Hz. When demagnetizing, the object to be demagnetized is first brought close to the demagnetizer to make the magnetism reach saturation, and then gradually move away, so that the hysteresis loop gradually shrinks until the residual magnetism is eliminated. The inside of the two clamping frames 301 are clamped with collection boxes 303, and the outer surfaces of the two collection boxes 303 are fixedly connected with two symmetrical clamping strips 304, each of which is clamped in the inside of the two clamping frames 301, and each clamping strip 304 is clamped in the inside of the two clamping frames 301. The inner wall of 304 is clamped with a positioning pin 305, and the bottom end of each positioning pin 305 passes through the bottom of the clamping frame 301. The upper surfaces of the two collection boxes 303 are fixedly connected with positioning frames 306. The outer surfaces of the two discharge barrels 2215 are fixedly connected with closing frames 307. The two positioning frames 306 are respectively clamped inside the two closing frames 307. The upper surfaces of the two positioning frames 306 are respectively in contact with the bottom surfaces of the two discharge barrels 2215. The insides of the two closing frames 307 are slidably connected with closing plates 308. The right sides of the two closing plates 308 are respectively in contact with the two positioning frames 3 06, the left side of the two closing plates 308 are fixedly connected to two push springs 309, and the other end of each push spring 309 is fixedly connected to the inner side wall of the closing frame 307. By setting the collecting mechanism 3, the discharged iron impurities can be smoothly collected. At the same time, the closing frame 307 is used to cooperate with the closing of the closing plate 308 to prevent the aluminum powder containing iron impurities from leaking out when the collecting box 303 is replaced, so that the aluminum powder containing iron impurities is not easy to leak out through the discharge barrel 2215, which increases the safety and convenience of the collecting box 303 to collect the aluminum powder containing iron impurities; The bottom surfaces of the two frame-type demagnetizers 302 are fixedly connected with a bearing plate 310. The left side of the bearing plate 310 is fixedly connected with the right side of the screening box 11. The bearing plate 310 can limit the position of the frame-type demagnetizer 302, so that the frame-type demagnetizer 302 and the discharge pipe 2208 maintain a relatively stable position relationship, thereby ensuring that the frame-type demagnetizer 302 can demagnetize iron impurities normally. The bottom surfaces of the two closed frames 307 are fixedly connected with support frames 311, and the bottom surfaces of the two support frames 311 are fixedly connected with the upper surface of the clamping frame 301. The support frames 311 can further support the position of the closed frames 307, making the closed frames 307 more stable and reliable when in use, and increasing the carrying capacity of the closed frames 307; The inner wall of each push spring 309 is provided with a telescopic rod 312, the telescopic end of each telescopic rod 312 is fixedly connected to the left side of the closing plate 308, and the other end of each telescopic rod 312 is fixedly connected to the inner wall of the closing frame 307. The telescopic rod 312 can prevent the push spring 309 from excessive bending while not affecting the extension and retraction of the push spring 309, thereby increasing the stability of the push spring 309 in use.

[0036] The specific implementation of this embodiment is as follows: by providing a frame-type demagnetizer 302 in conjunction with a carrier plate 310, the aluminum powder containing iron impurities passing through the discharge tube 2208 can be demagnetized, and the magnetism added to the iron impurities by the arc-shaped permanent magnet 2109 when adsorbing the aluminum powder containing iron impurities can be eliminated, thereby ensuring that the aluminum powder containing iron impurities can be smoothly discharged through the discharge tube 2215, and preventing the aluminum powder containing iron impurities from being magnetically adsorbed in the discharge tube 2215 and causing blockage. The aluminum powder can be collected by dropping into the collecting box 303 through the discharge barrel 2215 and the positioning frame 306. When the aluminum powder containing iron impurities in the collecting box 303 needs to be dumped, the positioning pin 305 is manually pulled upward to release the limit of the clamping strip 304, and then the handle on the collecting box 303 is manually pulled to separate the clamping strip 304 from the clamping frame 301. At the same time, the positioning frame 306 is also separated from the closing frame 307, so that the collecting box 303 can be removed smoothly. During the process of the closing frame 307 being separated, the elastic force provided by the push spring 309 cooperates with the closing frame 307 and the telescopic rod 312 to push the closing plate 308 to move together with the positioning frame 306 until the positioning frame 306 is separated from the closing frame 307. The closing plate 308 will block the discharge port of the discharge barrel 2215 from the bottom to prevent the aluminum powder containing iron impurities from leaking out when the collection box 303 is replaced, making it difficult for the aluminum powder containing iron impurities to leak out through the discharge barrel 2215, thereby increasing the collection box 303 to collect iron impurities. To ensure the safety of high-quality aluminum powder, when installing an empty collection box 303, you only need to insert the positioning frame 306 into the closing frame 307, and the snap-in strip 304 into the snap-in frame 301, and then push the collection box 303 through the positioning frame 306 to force the closing plate 308 to move, and push the spring 309 to contract and accumulate elastic force until the snap-in strip 304 is completely inserted into the snap-in frame 301, and finally limit the snap-in strip 304 in the internal position of the snap-in frame 301 through the positioning pin 305 to complete the installation of the collection box 303.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A particle size classification and screening device for producing high-purity aluminum powder, comprising a screening mechanism (1), characterized in that: The screening mechanism (1) comprises a screening box (11), the bottom surface of the screening box (11) is an inclined surface, the outer surface of the screening box (11) is fixedly connected to two supporting legs (12), the upper surface of the screening box (11) is fixedly connected to a feeding cover (13), two screens (14) are arranged inside the screening box (11), and the two screens (14) are both at a certain inclination angle, the left side surface of the screening box (11) is fixedly connected to three discharge covers (15), and the screening box (11) is provided with a rejection mechanism (2) inside; The rejecting mechanism (2) comprises an aluminum powder purification unit (21), the aluminum powder purification unit (21) being arranged inside the screening box (11), and the aluminum powder purification unit (21) being used to remove iron impurities in the aluminum powder during the aluminum powder screening process; The rejecting mechanism (2) further comprises an impurity discharge unit (22), wherein the impurity discharge unit (22) is arranged inside the screening box (11), and the impurity discharge unit (22) is used to discharge iron impurities from the inside of the screening box (11) to the outside; The rejection mechanism (2) further comprises a secondary cleaning unit (23), wherein the secondary cleaning unit (23) is arranged inside the impurity discharge unit (22), and the secondary cleaning unit (23) is used for performing secondary cleaning and collection of residual iron impurities in the filtered aluminum powder; A collecting mechanism (3) is provided at the bottom end of the impurity discharge unit (22); the collecting mechanism (3) is used in conjunction with the rejecting mechanism (2); the collecting mechanism (3) is used to collect iron impurities discharged by the impurity discharge unit (22).

2. The particle size classification and screening device for producing high-purity aluminum powder according to claim 1, characterized in that: The aluminum powder purification unit (21) comprises two rotating cylinders (2101), the two rotating cylinders (2101) are both rotatably connected to the inside of the screening box (11), the two rotating cylinders (2101) are both arranged between two screens (14), the inner wall of the screening box (11) is fixedly connected to a first guide frame (2102), the first guide frame (2102) is arranged above the two rotating cylinders (2101), the inner wall of the screening box (11) is fixedly connected to a second guide frame (2103), the second guide frame (2103) is arranged below the two rotating cylinders (2101), the two side surfaces of the screening box (11) are fixedly connected to two fixed cylinders (2104), and the inner wall of each fixed cylinder (2104) is fixedly connected to a sealed bearing (2105), The inner wall of the inner ring of each of the sealed bearings (2105) is fixedly connected to the outer surface of the rotating cylinder (2101); the left ends of the two rotating cylinders (2101) are fixedly connected to a rotating gear (2106); the outer surfaces of the two rotating gears (2106) are meshed with each other; a rotating motor (2107) is arranged on the left side of the screening box (11); the output end of the rotating motor (2107) is fixedly connected to the left end of one of the rotating gears (2106); the inner walls of the two rotating cylinders (2101) are fixedly connected to a fixing frame (2108); the outer surfaces of the two fixing frames (2108) are fixedly connected to a plurality of arc-shaped permanent magnets (2109); the outer surfaces of the plurality of arc-shaped permanent magnets (2109) are in contact with the inner wall of the rotating cylinder (2101).

3. The particle size classification and screening device for producing high-purity aluminum powder according to claim 1, characterized in that: The inner wall of the screening box (11) is fixedly connected to two stabilizing frames (2110), and the two stabilizing frames (2110) are both inclined at a certain angle. The outer surfaces of the two screens (14) are fixedly connected to fixing frames (2111), and the outer surfaces of the two fixing frames (2111) are fixedly connected to a plurality of vibration springs (2112), and the other ends of the plurality of vibration springs (2112) are fixedly connected to the inner wall of the stabilizing frame (2110). The bottom surfaces of the two fixing frames (2111) are fixedly connected to vibration motors (2113), and the outer surfaces of the two fixing frames (2111) are fixedly connected to rubber sleeves (2114), and the outer surfaces of the two rubber sleeves (2114) are respectively fixedly connected to the inner walls of the two stabilizing frames (2110).

4. The particle size classification and screening device for producing high-purity aluminum powder according to claim 2, characterized in that: The bottom surface of the rotating motor (2107) is fixedly connected to a stabilizing seat (2115), and the right side surface of the stabilizing seat (2115) is fixedly connected to the left side surface of the screening box (11).

5. The particle size classification and screening device for producing high-purity aluminum powder according to claim 2, characterized in that: The impurity discharge unit (22) comprises two discharge racks (2201), the two discharge racks (2201) are respectively arranged below the two rotating drums (2101), the right sides of the two discharge racks (2201) are fixedly connected to the inner wall of the screening box (11), the upper surfaces of the two discharge racks (2201) are fixedly connected to two shielding plates (2202), each of the shielding plates (2202) is inclined at a certain angle, the interiors of the two discharge racks (2201) are provided with plastic scrapers (2203), the inner walls of the two plastic scrapers (2203) are respectively in contact with the outer surfaces of the two rotating drums (2101), and the inner walls of the two discharge racks (2201) are provided with a plurality of A limiting cylinder (2204), the outer surfaces of several limiting cylinders (2204) are fixedly connected to two fixing columns (2205), the other end of each fixing column (2205) is fixedly connected to the inner wall of the discharge rack (2201), the inner walls of several limiting cylinders (2204) are slidably connected to telescopic cylinders (2207), the top ends of several telescopic cylinders (2207) are fixedly connected to the bottom surface of the plastic scraper (2203), the inner bottom walls of several limiting cylinders (2204) are fixedly connected to compression springs (2206), the top ends of each compression spring (2206) are fixedly connected to the bottom surface of the plastic scraper (2203), the right sides of the two discharge racks (2201) are fixedly connected to the inner walls of the limiting cylinders (2204), and the top ends of the compression springs (2206) are fixedly connected to the bottom surface of the plastic scraper (2203). A discharge pipe (2208) is connected, the other ends of the two discharge pipes (2208) are both extended to the right side of the screening box (11), the interiors of the two discharge pipes (2208) and the interiors of the two discharge racks (2201) are connected to a spiral shaft (2209) for rotation therewith, a mounting rack (2210) is provided above the two discharge pipes (2208), the left sides of the two mounting racks (2210) are both fixedly connected to the right side of the screening box (11), the bottom surfaces of the two mounting racks (2210) are both fixedly connected to reducers (2211), the input ends of the two reducers (2211) are respectively fixedly connected to the right ends of the two rotating cylinders (2101), and the output ends of the two reducers (2211) are respectively fixedly connected to the right ends of the two rotating cylinders (2101), and the output ends of the two reducers (2211) are respectively fixedly connected to the right ends of the two rotating cylinders (2101). The outlet ends are fixedly connected to the first pulley (2212), the left ends of the two spiral shafts (2209) pass through the discharge frame (2201) and are rotatably connected to the screening box (11), the right ends of the two spiral shafts (2209) pass through the discharge pipe (2208) and are fixedly connected to the second pulley (2213), the outer surfaces of the two first pulleys (2212) are sleeved with belts (2214), the two first pulleys (2212) are transmission-connected to the second pulley (2213) through the belts (2214), the outer surfaces of the two discharge pipes (2208) are fixedly connected to the discharge barrel (2215), and the outer surfaces of the two first pulleys (2212) are rotatably connected to the bearing seat (2216).The left sides of the two bearing seats (2216) are respectively fixedly connected to the right sides of the two mounting frames (2210).

6. The particle size classification and screening device for producing high-purity aluminum powder according to claim 5, characterized in that: The secondary cleaning unit (23) comprises a reciprocating screw (2301) fixedly arranged at both ends of the top of the second guide frame (2103), the left end of the reciprocating screw (2301) and the left end of the spiral shaft (2209) on the same side are fixedly connected to a transmission wheel (2302), the two transmission wheels (2302) are transmission-connected to a transmission belt (2303), the reciprocating screw (2301) is threadedly connected to a slider (2304), one end of the slider (2304) is fixedly connected to a double-headed scraper (2306), and the second cleaning unit (2303) is fixedly connected to the second guide frame (2103). Electromagnets (2305) are fixedly connected to both sides of the second guide frame (2103); temporary storage boxes (2307) are symmetrically fixedly connected to both sides of the second guide frame (2103); a delivery pipe (2308) is arranged in the temporary storage box (2307); the delivery pipe (2308) passes through the side walls of the second guide frame (2103) and the screening box (11); storage boxes (2309) are detachably connected to both sides of the screening box (11); and the end of the delivery pipe (2308) is located inside the storage box (2309).

7. The particle size classification and screening device for producing high-purity aluminum powder according to claim 5, characterized in that: The collecting mechanism (3) comprises two clamping frames (301), the left sides of the two clamping frames (301) are fixedly connected to the right side of the screening box (11), frame-type demagnetizers (302) are arranged above the two clamping frames (301), the two frame-type demagnetizers (302) are respectively arranged outside the two discharge pipes (2208), the inside of the two clamping frames (301) are clamped with a collecting box (303), the outer surfaces of the two collecting boxes (303) are fixedly connected with two symmetrical clamping strips (304), each of the clamping strips (304) is clamped inside the two clamping frames (301), the inner wall of each of the clamping strips (304) is clamped with a positioning pin (305), and the bottom end of each of the positioning pins (305) passes through the clamping frame (301). Below, the upper surfaces of the two collecting boxes (303) are fixedly connected with positioning frames (306), the outer surfaces of the two discharging barrels (2215) are fixedly connected with closing frames (307), the two positioning frames (306) are respectively clamped in the inside of the two closing frames (307), the upper surfaces of the two positioning frames (306) are respectively in contact with the bottom surfaces of the two discharging barrels (2215), the inside of the two closing frames (307) are slidably connected with closing plates (308), the right sides of the two closing plates (308) are respectively in contact with the left sides of the two positioning frames (306), and the left sides of the two closing plates (308) are fixedly connected with two push springs (309), and the other end of each push spring (309) is fixedly connected to the inner wall of the closing frame (307).

8. The particle size classification and screening device for producing high-purity aluminum powder according to claim 7, characterized in that: The bottom surfaces of the two frame-type demagnetizers (302) are commonly fixedly connected to a carrying plate (310), and the left side surface of the carrying plate (310) is fixedly connected to the right side surface of the screening box (11).

9. The particle size classification and screening device for producing high-purity aluminum powder according to claim 7, characterized in that: The bottom surfaces of the two closed frames (307) are fixedly connected to the support frames (311), and the bottom surfaces of the two support frames (311) are fixedly connected to the upper surface of the clamping frame (301).

10. The particle size classification and screening device for producing high-purity aluminum powder according to claim 7, characterized in that: The inner wall of each push spring (309) is provided with a telescopic rod (312), the telescopic end of each telescopic rod (312) is fixedly connected to the left side surface of the closing plate (308), and the other end of each telescopic rod (312) is fixedly connected to the inner wall of the closing frame (307).

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