Multistage separation device for air classification of magnesium powder

Abstract

The application discloses a multi-section separation device for airflow grading of magnesium powder and relates to the technical field of multi-section separation.The device comprises a bottom plate, a screening box and an air pump air compressor, the outer surface of the screening box is welded with a rack, the bottom end of the rack is riveted to the upper surface of the bottom plate, and the air pump air compressor is arranged on the upper surface of the bottom plate.The screening box is arranged to place the magnesium powder and prevent the magnesium powder from leaking out during screening.The air pump air compressor is arranged to generate high-pressure airflow at the output end after being connected to a power source and starting to work.A multi-stage screening mechanism is arranged on the inner wall of the screening box, which is used for screening magnesium powder with different particle diameters.The multi-stage screening mechanism comprises a dividing box and an air tank, the dividing box is welded to the inner wall of the screening box, a communication hole is formed in the middle of the dividing box, and the magnesium powder can be separated in multiple stages.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of multi-stage separation, in particular to a multi-stage separation device for magnesium powder airflow classification. BACKGROUND

[0002] Magnesium powder airflow classification is a process method for fine classification of magnesium powder particles using airflow separation technology, mainly applied in powder metallurgy, chemical industry, medicine and other fields to meet the specific requirements of different industries for magnesium powder particle size distribution. Based on the motion difference of particles in the airflow field, by adjusting the airflow speed, classification wheel speed and other parameters, efficient separation of magnesium powder of different particle sizes is realized. In the airflow classification process, the magnesium powder raw material enters the classification chamber through the feeding system, and under the action of high-speed airflow, particles produce different motion trajectories due to mass and inertia differences. Finer particles enter the cyclone separator or collector with the airflow, while coarse particles are separated and discharged under the action of centrifugal force.

[0003] In the magnesium powder airflow classification process, if different particle sizes of magnesium powder cannot be effectively separated, it will directly affect the performance and application effect of the product. The particle size distribution of the magnesium powder that is not fully classified is too wide, which may cause problems such as uneven density, inconsistent sintering shrinkage in subsequent processing (such as pressing molding, 3D printing or alloy preparation), and reduce the mechanical properties and structural stability of the material. In the field of pyrotechnic agents or military industry, the burning rate of magnesium powder is closely related to the particle size. If coarse and fine particles are mixed, it will cause unstable burning, and even cause safety hazards. SUMMARY

[0004] To achieve the above purpose, the present application is implemented by the following technical scheme: a multi-stage separation device for magnesium powder airflow classification, comprising a bottom plate, a screening box and an air pump air compressor, a rack is welded to the outer surface of the screening box, the bottom end of the rack is riveted to the upper surface of the bottom plate, the air pump air compressor is arranged on the upper surface of the bottom plate, a multi-stage screening mechanism is arranged at the inner wall of the screening box, which is used to screen out magnesium powder with different particle diameters, the multi-stage screening mechanism comprises a partition box and a gas box, the partition box is welded to the inner wall of the screening box, a communication hole is formed in the middle of the partition box, the gas box is welded to the inner cavity of the partition box and the screening box, the partition box and the gas box divide the screening box into four spaces, a first screen, a second screen and a third screen are welded in sequence at the partition of the partition box; a cover plate is movably connected to the opening of the screening box, an adjusting mechanism penetrates through the upper surface of the cover plate, the adjusting mechanism comprises a connecting box, the connecting box penetrates through the upper surface of the cover plate, the connecting box is located directly above the gas box, a cylinder penetrates through the upper surface of the connecting box, a connecting port penetrates through the outer surface of the cylinder, a connecting pipe is sleeved at the end of the connecting port away from the cylinder, and the end of the connecting pipe away from the connecting port is connected to the output end of the air pump air compressor.

[0005] Preferably, the lower surface of the cover plate is fixedly connected with a sealing ring, the sealing ring is extruded and matched with the upper surface of the screening box, the top of the inner wall of the cover plate is fixedly connected with a sealing cover, the number of the sealing cover is four, and the four sealing covers are respectively aligned with the four spaces divided by the dividing box, the gas box and the screening box, a feeding pipe penetrates the cover plate above the gas outlet of the gas box, a sealing plug is movably connected with the opening of the feeding pipe, and an exhaust plug penetrates the upper surface of the cover plate.

[0006] Preferably, the outer surface of the gas box close to the first screen is penetrated by a gas blowing pipe, the pore size of the first screen is 150 μm, the pore size of the second screen is 80 μm, and the pore size of the third screen is 30 μm.

[0007] Preferably, the bottom of the inner wall of the screening box is penetrated by an agitating mechanism, the agitating mechanism is located between the gas box and the first screen, the agitating mechanism comprises a first discharge port, the first discharge port penetrates the bottom of the inner wall of the screening box, a first air permeable frame is welded at the inner wall of the first discharge port, a rotating rod is rotatably connected at the inner wall of the first air permeable frame, the outer surface of the rotating rod is provided with a ball, and the ball is frictionally matched with the inner wall of the first air permeable frame.

[0008] Preferably, the outer surface of the rotating rod is welded with an inclined plate, the number of the inclined plate is several, and the several inclined plates are distributed in a spiral shape on the outer surface of the rotating rod, an agitating plate is welded at the bottom of the outer surface of the rotating rod, and the agitating plate is frictionally matched with the inner wall of the first discharge port.

[0009] Preferably, the bottom of the inner wall of the screening box is penetrated by a second discharge port, the second discharge port is located between the first screen and the second screen, the bottom of the inner wall of the screening box is penetrated by a third discharge port, the third discharge port is located between the second screen and the third screen, the bottom of the inner wall of the screening box is penetrated by a fourth discharge port, the fourth discharge port is located between the third screen and the gas box, and the exhaust plug is located directly above the third screen and the gas box.

[0010] Preferably, the outer surface of the cylinder is penetrated by an air permeable cylinder, the outer surface of the air permeable cylinder is sleeved with a wrapping box, the lower surface of the wrapping box is penetrated by a transfer pipe, the transfer pipe penetrates the upper surface of the cover plate, the transfer pipe is located directly above the communication hole, a hydraulic cylinder is fixedly connected with the end of the air permeable cylinder away from the cylinder, the output end of the hydraulic cylinder is provided with a moving rod, and the moving rod extends to the inner cavity of the cylinder.

[0011] Preferably, the inner wall of the cylinder is welded with a blocking funnel, the inner wall of the blocking funnel is movably connected with a blocking ball, the blocking ball is welded at the end of the moving rod away from the hydraulic cylinder, the end of the blocking ball away from the moving rod is riveted with a second air permeable frame, the outer ring of the second air permeable frame is welded with a blocking ring, and the blocking ring is frictionally matched with the inner wall of the cylinder.

[0012] Preferably, the lower surface of the screening box is provided with a discharging mechanism, the discharging mechanism comprises a limiting rod welded on the outer surface of the screening box, a rotating ring rotatably connected in the inner cavity of the limiting rod, a rotating disc welded on the inner ring of the rotating ring, and a discharging pipe penetrating through the lower surface of the rotating disc and fixedly connected with a gasket at the opening of the discharging pipe.

[0013] Preferably, the discharging mechanism further comprises an air outlet pipe welded at the bottom of the communication hole, a rolling bearing welded at the bottom of the inner wall of the air outlet pipe, a discharging cylinder fixedly connected at the inner ring of the rolling bearing, an air suction pipe penetrating through the outer side of the discharging cylinder, and the air suction pipe is frictionally matched with the bottom end of the discharging pipe.

[0014] The application provides a multi-stage separation device for magnesium powder airflow grading.

[0015] I. The multi-stage separation device for magnesium powder airflow grading can place the magnesium powder and prevent the magnesium powder from leaking out during screening by arranging a screening box. The opening of the screening box can be closed by arranging a cover plate, thereby preventing the magnesium powder in the inner cavity of the screening box from leaking out during separation. The cylinder and the gas tank are connected by arranging a connecting box, thereby enabling the airflow to enter the inner cavity of the gas tank. The high-pressure air generated by the air pump air compressor can flow into the inner cavity of the cylinder by connecting the pipe after connecting the power supply and turning on the switch.

[0016] II. The multi-stage separation device for magnesium powder airflow grading can separate the magnesium powder of different particle sizes by arranging a multi-stage screening mechanism, thereby achieving multi-stage separation.

[0017] III. The multi-stage separation device for magnesium powder airflow grading can divide the screening box into four spaces by arranging a dividing box and a gas tank, thereby enabling the gas to flow into the four spaces in sequence when the gas tank sprays gas. The first screen, the second screen, and the third screen can be used to screen the magnesium powder in the inner cavity of the screening box in sequence, thereby separating the magnesium powder of different particle sizes in sequence from large to small. The airflow can be blown into the inner cavity of the dividing box through the exhaust port of the gas tank by arranging the gas tank.

[0018] Four, the magnesium powder airflow grading multi-stage separation device, by setting the adjusting mechanism, the direction of airflow can be adjusted, when the airflow blows into the screen box inner cavity, the magnesium powder in the screen box inner cavity can be blown, and then cooperate with the multi-stage screening mechanism, realize the multi-stage separation effect of magnesium powder, and when the separated magnesium powder needs to be discharged, by adjusting the flow direction of the airflow, the magnesium powder in the screen box inner cavity is discharged.

[0019] Five, the magnesium powder airflow grading multi-stage separation device, through the discharge mechanism, the opening of the screen box bottom can be blocked when the magnesium powder is screened, and different specifications of magnesium powder can be discharged after the magnesium powder is screened, and the residual magnesium powder in the multiple spaces can be completely discharged, by setting the limiting rod, the rotating ring can be limited, the rotating ring can drive the rotating disc and the discharge pipe to rotate, and then the direction of the discharge pipe is adjusted. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is an external structure diagram of the magnesium powder airflow grading multi-stage separation device.

[0021] Figure 2 It is a structure side view of the magnesium powder airflow grading multi-stage separation device.

[0022] Figure 3 It is a structure expansion diagram of the magnesium powder airflow grading multi-stage separation device.

[0023] Figure 4 It is a structure diagram of the multi-stage screening mechanism.

[0024] Figure 5 It is a structure top view of the multi-stage screening mechanism.

[0025] Figure 6 It is a structure diagram of the stirring mechanism.

[0026] Figure 7 It is a cover plate structure diagram.

[0027] Figure 8 It is a structure diagram of the adjusting mechanism.

[0028] Figure 9 It is a structure diagram of the discharge mechanism.

[0029] Figure 10 It is a structure diagram of the discharge mechanism.

[0030] In the figure: 1, bottom plate; 2, frame; 3, screening box; 4, cover plate; 5, multi-stage screening mechanism; 6, adjusting mechanism; 7, discharging mechanism; 8, air pump air compressor; 9, connecting pipe; 10, feeding pipe; 11, sealing plug; 12, sealing ring; 13, sealing cover; 14, exhaust plug; 51, dividing box; 52, communication hole; 53, air tank; 54, first screen; 55, second screen; 56, third screen; 57, air blowing pipe; 58, stirring mechanism; 581, first discharge port; 582, first air permeable frame; 583, ball; 584, rotating rod; 585, inclined plate; 586, stirring plate; 59, second discharge port; 510, third discharge port; 511, fourth discharge port; 61, connecting box; 62, cylinder; 63, connecting port; 64, air permeable cylinder; 65, wrapping box; 66, transfer pipe; 67, hydraulic cylinder; 68, moving rod; 69, blocking funnel; 610, blocking ball; 611, second air permeable frame; 612, blocking ring; 71, limiting rod; 72, rotating ring; 73, rotating disc; 74, discharge pipe; 75, gasket; 76, air outlet pipe; 77, rolling bearing; 78, discharge cylinder; 79, air suction pipe. DETAILED DESCRIPTION

[0031] The application will be further described below in conjunction with the drawings and specific embodiments. The embodiments of the application are given for illustrative and descriptive purposes only and are not exhaustive or limiting of the application. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are chosen and described in order to best explain the principles of the application and its practical application and to enable others skilled in the art to best utilize the application in various embodiments with various modifications as are suited to the particular use contemplated.

[0032] As Figure 1 Figure 10 ​As shown, the present application provides a technical scheme: magnesium powder airflow grading multi-stage separation device, including bottom plate 1, screening box 3 and air pump air compressor 8, the outer surface of screening box 3 is welded with rack 2, the bottom end of rack 2 is riveted on the upper surface of bottom plate 1, air pump air compressor 8 is arranged on the upper surface of bottom plate 1, by setting screening box 3, magnesium powder can be placed, and magnesium powder can not leak out when screening in it, by setting air pump air compressor 8, high pressure airflow can be generated at the output end after power is connected and work begins, the inner wall of screening box 3 is provided with multistage screening mechanism 5, which is used for screening magnesium powder with different particle diameters, multistage screening mechanism 5 includes dividing box 51 and gas tank 53, dividing box 51 is welded at the inner wall of screening box 3, the middle part of dividing box 51 is provided with communication hole 52, gas tank 53 is welded at the inner cavity of dividing box 51 and screening box 3, the dividing box 51 and gas tank 53 divide four spaces in screening box 3, the dividing part of dividing box 51 is sequentially welded with first screen 54, second screen 55 and third screen 56, by setting multistage screening mechanism 5, high pressure airflow generated by air pump air compressor 8 can be used to screen magnesium powder flowing into the inner cavity of screening box 3, and different particle sizes of magnesium powder can be separated, achieving multi-stage separation effect, by setting dividing box 51 and gas tank 53, screening box 3 can be divided into four spaces in cooperation with screening box 3, and then when gas is sprayed from gas tank 53, the gas flows into the four spaces in turn, by setting first screen 54, second screen 55 and third screen 56, magnesium powder in the inner cavity of screening box 3 can be screened in turn, and magnesium powder with different particle sizes can be separated from large to small, by setting gas tank 53, airflow can be blown into the inner cavity of dividing box 51 through the exhaust port of gas tank 53.The opening of the screening box 3 is movably connected with a cover plate 4, the upper surface of the cover plate 4 is penetrated by an adjusting mechanism 6, the adjusting mechanism 6 comprises a connecting box 61 which penetrates the upper surface of the cover plate 4, the connecting box 61 is located directly above the air tank 53, the upper surface of the connecting box 61 is penetrated by a cylinder 62, the outer surface of the cylinder 62 is penetrated by a connecting port 63, the end of the connecting port 63 away from the cylinder 62 is sleeved with a connecting pipe 9, the end of the connecting pipe 9 away from the connecting port 63 is connected with the output end of the air pump air compressor 8, by arranging the cover plate 4, the opening of the screening box 3 can be closed, thereby preventing the magnesium powder in the inner cavity of the screening box 3 from leaking during separation, by arranging the adjusting mechanism 6, the direction of the airflow can be adjusted, when the airflow blows into the inner cavity of the screening box 3, the magnesium powder in the inner cavity of the screening box 3 can be blown, thereby cooperating with the multi-stage screening mechanism 5 to realize multi-stage separation effect of the magnesium powder, when the separated magnesium powder needs to be discharged, the flow direction of the airflow is adjusted to discharge the magnesium powder in the inner cavity of the screening box 3, by arranging the connecting box 61, the cylinder 62 and the air tank 53 can be connected together, thereby enabling the airflow to enter the inner cavity of the air tank 53, by arranging the air pump air compressor 8, high-pressure air can be generated after the power is connected and the switch is turned on, and the high-pressure air flows into the inner cavity of the cylinder 62 through the connecting pipe 9.

[0033] The lower surface of the cover plate 4 is fixedly connected with a sealing ring 12 which is in extrusion fit with the upper surface of the screening box 3, the top of the inner wall of the cover plate 4 is fixedly connected with four sealing covers 13 which are respectively aligned with the four spaces divided by the dividing box 51, the air tank 53 and the screening box 3, the cover plate 4 which is located directly above the air outlet of the air tank 53 is penetrated by a feeding pipe 10, the opening of the feeding pipe 10 is movably connected with a sealing plug 11, the upper surface of the cover plate 4 is penetrated by an exhaust plug 14, by arranging the sealing ring 12, the sealing property of the opening of the cover plate 4 and the screening box 3 can be improved, by arranging the sealing covers 13, the spaces divided by the dividing box 51, the air tank 53 and the screening box 3 can be tightly extruded when connected, thereby enabling the dividing box 51, the air tank 53 and the screening box 3 to be independently formed into four spaces, by arranging the exhaust plug 14, the airflow in the inner cavity of the screening box 3 can be discharged, thereby maintaining the balance of the internal air pressure, the inner wall of the exhaust plug 14 is provided with filter cotton which can block the magnesium powder in the air, so that the airflow can be discharged without the fine magnesium powder being discharged into the air, by arranging the feeding pipe 10, the magnesium powder which needs to be separated can be poured into the first space formed by the dividing box 51, the air tank 53 and the screening box 3, by arranging the sealing plug 11, the opening of the feeding pipe 10 can be plugged, thereby preventing the magnesium powder from being discharged from the opening of the feeding pipe 10.

[0034] An air blowing pipe 57 penetrates the outer surface of the air box 53 near the first screen 54. The aperture of the first screen 54 is 150μm, the aperture of the second screen 55 is 80μm, and the aperture of the third screen 56 is 30μm. By setting the first screen 54, the second screen 55, and the third screen 56, magnesium powder with a particle size greater than 150μm can be blocked in the space formed by the air box 53, the first screen 54, and the screening box 3. Magnesium powder with a particle size greater than 80μm and less than 150μm can be blocked in the space formed by the first screen 54, the second screen 55, and the screening box 3. Magnesium powder with a particle size greater than 30μm and less than 80μm can be blocked in the space formed by the second screen 55, the third screen 56, and the screening box 3. Magnesium powder with a particle size less than 30μm can be blocked in the space formed by the third screen 56, the air box 53, and the screening box 3.

[0035] A stirring mechanism 58 penetrates the bottom of the inner wall of the screening box 3. The stirring mechanism 58 is located between the air box 53 and the first screen 54. The stirring mechanism 58 includes a first discharge port 581, which penetrates the bottom of the inner wall of the screening box 3. A first ventilated frame 582 is welded to the inner wall of the first discharge port 581. A rotating rod 584 is rotatably connected to the inner wall of the first ventilated frame 582. Ball bearings 583 are provided on the outer surface of the rotating rod 584. The ball bearings 583 and the first ventilated frame 584 are connected to the air box 53. The inner wall friction of 82 is adapted, and by setting the stirring mechanism 58, when the airflow is blown into the inner cavity of the screening box 3 through the air blowing pipe 57 on the outer surface of the air box 53, the flow of the airflow will stir the magnesium powder falling in the space formed by the air box 53, the first screen 54 and the screening box 3. By setting the first discharge port 581, magnesium powder with a particle size greater than 150μm in the space formed by the air box 53, the first screen 54 and the screening box 3 can be discharged from the first discharge port 581. The discharge process utilizes a first vent frame 582 to limit the rotation of the rotating rod 584 while allowing magnesium powder to leak out. A ball bearing 583 ensures stable rotation of the rotating rod 584 within the first vent frame 582. Several inclined plates 585 are welded to the outer surface of the rotating rod 584 in a spiral arrangement. A stirring plate 586 is welded to the bottom of the outer surface of the rotating rod 584, and the stirring plate 586 is frictionally fitted against the inner wall of the first discharge port 581. By using inclined plates 585, when high-pressure airflow is ejected from the air pipe 57, the inclined plates 585 are subjected to the squeezing force of the airflow, causing the rotating rod 584 to drive the stirring plate 586 to agitate. This prevents larger magnesium powder particles from clogging the inner cavity of the first discharge port 581 and allows magnesium powder adhering to the inner wall of the first discharge port 581 to be scraped off.

[0036] A second discharge port 59 penetrates the bottom of the inner wall of the screening box 3, located between the first screen 54 and the second screen 55. A third discharge port 510 penetrates the bottom of the inner wall of the screening box 3, located between the second screen 55 and the third screen 56. A fourth discharge port 511 penetrates the bottom of the inner wall of the screening box 3, located between the third screen 56 and the air box 53. The exhaust plug 14 is located directly above the space between the third screen 56 and the air box 53. By setting the second discharge port 59, the material at the first screen 54 can be discharged. Magnesium powder with a particle size greater than 80μm and less than 150μm in the space formed by the second screen 55 and the screening box 3 can be discharged through the second discharge port 59. By setting the third discharge port 510, magnesium powder with a particle size greater than 30μm and less than 80μm in the space formed by the second screen 55, the third screen 56 and the screening box 3 can be discharged through the third discharge port 510. By setting the fourth discharge port 511, magnesium powder with a particle size less than 30μm in the space formed by the third screen 56, the air box 53 and the screening box 3 can be discharged through the fourth discharge port 511.

[0037] A ventilator 64 passes through the end of cylinder 62 away from connection port 63. A package box 65 is fitted onto the outer surface of the ventilator 64. A transfer pipe 66 passes through the lower surface of the package box 65 and through the upper surface of cover plate 4. The transfer pipe 66 is located directly above the connecting hole 52. A hydraulic cylinder 67 is fixedly connected to the end of the ventilator 64 away from cylinder 62. A moving rod 68 is provided at the output end of the hydraulic cylinder 67. The moving rod 68 extends into the inner cavity of cylinder 62. By setting up the ventilator 64, airflow in the inner cavity of cylinder 62 can enter the inner cavity of the ventilator 64. Then, the airflow flows into the inner cavity of package box 65 through the holes on the outer surface of the ventilator 64. After that, the airflow flows into the inner cavity of connecting hole 52 through transfer pipe 66. By setting up the hydraulic cylinder 67, the moving rod 68 can be moved under control. A blocking funnel 69 is welded to the inner wall of cylinder 62. A blocking ball 610 is movably connected to the inner wall of the blocking funnel 69. The blocking ball 610 is welded to the end of the moving rod 68 away from the hydraulic cylinder 67. A second vent frame 611 is riveted to the end of the blocking ball 610 away from the moving rod 68. A blocking ring 612 is welded to the outer ring of the second vent frame 611. The blocking ring 612 is frictionally adapted to the inner wall of the cylinder 62. By setting the blocking funnel 69 and the blocking ball 610, when the blocking ball 610 contacts the blocking funnel 69, the airflow will not flow into the inner cavity of the vent cylinder 64. By setting the second vent frame 611, the blocking ball 610 can connect the blocking ring 612 together, while allowing the airflow to pass through. By setting the blocking ring 612, when it moves with the blocking ball 610, the blocking ring 612 can block the opening of the connecting box 61, thereby preventing the airflow from flowing into the inner cavity of the connecting box 61.

[0038] A discharge mechanism 7 is provided on the lower surface of the screening box 3. The discharge mechanism 7 includes a limiting rod 71, which is welded to the outer surface of the screening box 3. A rotating ring 72 is rotatably connected to the inner cavity of the limiting rod 71. A rotating disk 73 is welded to the inner ring of the rotating ring 72. A discharge pipe 74 passes through the lower surface of the rotating disk 73. A gasket 75 is fixedly connected to the opening of the discharge pipe 74. By setting up the discharge mechanism 7, the opening at the bottom of the screening box 3 can be blocked during magnesium powder screening. After the magnesium powder is screened, magnesium powder of different specifications can be discharged. At the same time, residual magnesium powder in multiple spaces can be completely discharged. By setting up the limiting rod 71, the rotating ring 72 can be limited, so that the rotating ring 73 can drive the rotating disk 72 and the rotating disk 73. The discharge pipe 74 rotates, thereby adjusting its orientation. The discharge mechanism 7 also includes an air outlet pipe 76, which is welded to the bottom of the connecting hole 52. A rolling bearing 77 is welded to the bottom of the inner wall of the air outlet pipe 76. A discharge cylinder 78 is fixedly connected to the inner ring of the rolling bearing 77. An air suction pipe 79 passes through the outer side of the discharge cylinder 78. The air suction pipe 79 is frictionally fitted with the bottom end of the discharge pipe 74. By setting the air outlet pipe 76, the airflow in the cavity of the connecting hole 52 can be discharged through the air outlet pipe 76. By setting the discharge cylinder 78, under the limit of the rolling bearing 77, the discharge cylinder 78 can rotate stably in the cavity of the air outlet pipe 76, thereby adjusting the contact position between the air suction pipe 79 and the discharge pipe 74.

[0039] Working principle: During use, the operator rotates the rotating disk 73, causing the discharge pipe 74 and the washer 75 on the upper surface of the rotating disk 73 to press against the lower surface of the screening box 3, and preventing the discharge pipe 74 from aligning with the first discharge port 581, the second discharge port 59, the third discharge port 510, and the fourth discharge port 511. Then, the magnesium powder to be screened is poured into the inner cavity of the screening box 3 through the feed pipe 10. After the magnesium powder is poured into the inner cavity of the screening box 3, the sealing plug 11 is used to block the opening of the feed pipe 10. Then, the air compressor 8 is started, which generates a large amount of gas. The airflow enters the inner cavity of the cylinder 62 through the connecting pipe 9 and flows into the connecting box 61. Inside the air chamber 53, airflow is then blown into the screening box 3 through the air pipe 57. Under the influence of the airflow, the magnesium powder is agitated. Through the action of the first screen 54, the second screen 55, and the third screen 56, magnesium powder particles larger than 150 μm are blocked in the space formed by the air chamber 53, the first screen 54, and the screening box 3; magnesium powder particles larger than 80 μm but smaller than 150 μm are blocked in the space formed by the first screen 54, the second screen 55, and the screening box 3; magnesium powder particles larger than 30 μm but smaller than 80 μm are blocked in the space formed by the second screen 55, the third screen 56, and the screening box 3; and magnesium powder particles smaller than 30 μm... Magnesium powder is trapped in the space formed by the third screen 56, the air box 53, and the screening box 3, while the airflow is discharged through the exhaust plug 14. After a period of time, the magnesium powder is separated in multiple stages, and the air compressor 8 stops working. Then, the rotating disc 73 is rotated, and multiple discharge pipes 74 and gaskets 75 are aligned with the first discharge port 581, the second discharge port 59, the third discharge port 510, and the fourth discharge port 511, respectively, so that the separated magnesium powder can leak out and be collected. After the magnesium powder stops leaking, the suction pipe 79 is aligned with the discharge pipe 74 at the bottom of the fourth discharge port 511, and then the hydraulic cylinder 67 is activated, and the plug ring 61 is closed. 2. Block the opening of the connecting box 61, then place the collection bag over the opening of the discharge cylinder 78, and then start the air compressor 8 to allow airflow to flow through the vent 64 into the inner cavity of the packaging box 65, and finally discharge through the transfer pipe 66, the connecting hole 52 and the air outlet pipe 76. Under the flow of air, the suction pipe 79 generates suction, which draws out the magnesium powder in the space formed by the third screen 56, the air box 53 and the screening box 3 and flows into the collection bag. Then, the suction pipe 79 is sequentially brought into contact with the discharge pipe 74 at the bottom of the third discharge port 510, the discharge pipe 74 at the bottom of the second discharge port 59 and the discharge pipe 74 at the bottom of the first discharge port 581, and different collection bags are replaced at the same time to collect the residual magnesium powder.

[0040] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A multi-stage separation device for magnesium powder airflow classification, comprising a base plate (1), a screening box (3), and an air compressor (8), wherein a frame (2) is welded to the outer surface of the screening box (3), the bottom end of the frame (2) is riveted to the upper surface of the base plate (1), and the air compressor (8) is disposed on the upper surface of the base plate (1), characterized in that: The inner wall of the screening box (3) is provided with a multi-stage screening mechanism (5), which is used to separate magnesium powder of different particle diameters. The multi-stage screening mechanism (5) includes a dividing box (51) and an air box (53). The dividing box (51) is welded to the inner wall of the screening box (3). A connecting hole (52) is opened in the middle of the dividing box (51). The air box (53) is welded to the inner cavity of the dividing box (51) and the screening box (3). The dividing box (51) and the air box (53) divide the screening box (3) into four spaces. A first screen (54) and a second screen (55) are welded sequentially at the dividing points of the dividing box (51). The third screen (56); a cover plate (4) is movably connected to the opening of the screening box (3), and an adjustment mechanism (6) is passed through the upper surface of the cover plate (4). The adjustment mechanism (6) includes a connecting box (61), which passes through the upper surface of the cover plate (4). The connecting box (61) is located directly above the air box (53). A cylinder (62) passes through the upper surface of the connecting box (61), and a connecting port (63) passes through the outer surface of the cylinder (62). A connecting pipe (9) is sleeved on the end of the connecting port (63) away from the cylinder (62), and the end of the connecting pipe (9) away from the connecting port (63) is connected to the output end of the air compressor (8).

2. The multi-stage separation device for magnesium powder airflow classification according to claim 1, characterized in that: A sealing ring (12) is fixedly connected to the side of the lower surface of the cover plate (4). The sealing ring (12) is squeezed and adapted to the upper surface of the screening box (3). A sealing cover (13) is fixedly connected to the top of the inner wall of the cover plate (4). There are four sealing covers (13), and the four sealing covers (13) are respectively aligned with the four spaces divided by the dividing box (51), the air box (53), and the screening box (3). A feed pipe (10) passes through the cover plate (4) directly above the air outlet of the air box (53). A sealing plug (11) is movably connected to the opening of the feed pipe (10). An exhaust plug (14) passes through the upper surface of the cover plate (4).

3. The multi-stage separation device for magnesium powder airflow classification according to claim 2, characterized in that: An air blowing pipe (57) is inserted through the outer surface of the air box (53) near the first screen (54). The aperture of the first screen (54) is 150 μm, the aperture of the second screen (55) is 80 μm, and the aperture of the third screen (56) is 30 μm.

4. The multi-stage separation device for magnesium powder airflow classification according to claim 3, characterized in that: A stirring mechanism (58) is provided through the bottom of the inner wall of the screening box (3). The stirring mechanism (58) is located between the air box (53) and the first screen (54). The stirring mechanism (58) includes a first discharge port (581). The first discharge port (581) penetrates the bottom of the inner wall of the screening box (3). A first air-permeable frame (582) is welded to the inner wall of the first discharge port (581). A rotating rod (584) is rotatably connected to the inner wall of the first air-permeable frame (582). A ball bearing (583) is provided on the outer surface of the rotating rod (584). The ball bearing (583) is rubbed against the inner wall of the first air-permeable frame (582).

5. The multi-stage separation device for magnesium powder airflow classification according to claim 4, characterized in that: An inclined plate (585) is welded to the outer surface of the rotating rod (584). There are several inclined plates (585), and the inclined plates (585) are distributed in a spiral shape on the outer surface of the rotating rod (584). A stirring plate (586) is welded to the bottom of the outer surface of the rotating rod (584). The stirring plate (586) is frictionally adapted to the inner wall of the first discharge port (581).

6. The multi-stage separation device for magnesium powder airflow classification according to claim 5, characterized in that: The bottom of the inner wall of the screening box (3) is provided with a second discharge port (59), which is located between the first screen (54) and the second screen (55). The bottom of the inner wall of the screening box (3) is provided with a third discharge port (510), which is located between the second screen (55) and the third screen (56). The bottom of the inner wall of the screening box (3) is provided with a fourth discharge port (511), which is located between the third screen (56) and the air box (53). The exhaust plug (14) is located directly above the third screen (56) and the air box (53).

7. The multi-stage separation device for magnesium powder airflow classification according to claim 6, characterized in that: A ventilator (64) is inserted through one end of the cylinder (62) away from the connection port (63). A package box (65) is fitted on the outer surface of the ventilator (64). A transfer pipe (66) is inserted through the lower surface of the package box (65). The transfer pipe (66) is inserted through the upper surface of the cover plate (4). The transfer pipe (66) is located directly above the connecting hole (52). A hydraulic cylinder (67) is fixedly connected to one end of the ventilator (64) away from the cylinder (62). A moving rod (68) is provided at the output end of the hydraulic cylinder (67). The moving rod (68) extends to the inner cavity of the cylinder (62).

8. The multi-stage separation device for magnesium powder airflow classification according to claim 7, characterized in that: A blocking funnel (69) is welded to the inner wall of the cylinder (62), and a blocking ball (610) is movably connected to the inner wall of the blocking funnel (69). The blocking ball (610) is welded to the end of the moving rod (68) away from the hydraulic cylinder (67). A second vent frame (611) is riveted to the end of the blocking ball (610) away from the moving rod (68). A blocking ring (612) is welded to the outer ring of the second vent frame (611). The blocking ring (612) is frictionally adapted to the inner wall of the cylinder (62).

9. The multi-stage separation device for magnesium powder airflow classification according to claim 8, characterized in that: The lower surface of the screening box (3) is provided with a discharge mechanism (7). The discharge mechanism (7) includes a limiting rod (71). The limiting rod (71) is welded to the outer surface of the screening box (3). A rotating ring (72) is rotatably connected to the inner cavity of the limiting rod (71). A rotating disk (73) is welded to the inner ring of the rotating ring (72). A discharge pipe (74) passes through the lower surface of the rotating disk (73). A washer (75) is fixedly connected to the opening of the discharge pipe (74).

10. The multi-stage separation device for magnesium powder airflow classification according to claim 9, characterized in that: The discharge mechanism (7) also includes an air outlet pipe (76), which is welded to the bottom of the connecting hole (52). A rolling bearing (77) is welded to the bottom of the inner wall of the air outlet pipe (76). A discharge cylinder (78) is fixedly connected to the inner ring of the rolling bearing (77). An air suction pipe (79) passes through the outer side of the discharge cylinder (78). The air suction pipe (79) is frictionally fitted with the bottom end of the discharge pipe (74).

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