Automatic screening device and method for aluminum oxide microsphere production

Abstract

The invention discloses an automatic screening device and method for aluminum oxide microsphere production. The automatic screening device specifically comprises a lifting base, a screening barrel is arranged at the top of the lifting base, a center driving column extending into the screening barrel is arranged in the center of the interior of the lifting base, and a lower outer spraying convection mechanism connected to the outer side of the center driving column in a sleeving mode is arranged in the lifting base; precise grading screening is achieved through different mesh numbers of the upper filter ring cover and the lower filter ring cover, and various requirements are met; multiple impurities are cleaned by means of rolling of the spiral sheet, pushing of ionic wind, air injection of the air injection column and the like, and the product purity is improved; downward-spraying and upward-pumping pneumatic circulation is constructed, static elimination, air purification, airflow utilization optimization and resource recycling rate improvement are achieved, an upward-outward-spraying convection mechanism automatically sprays air, external air supply equipment can be replaced according to needs, the automation level and flexibility of the device are improved, and the device adapts to different production scenes.

Description

Technical Field

[0001] The invention relates to the technical field of alumina microsphere processing, in particular to an automatic screening device and method for producing alumina microspheres. Background Art

[0002] Alumina microspheres play an important role in many industrial fields. For example, in the field of catalysts, alumina microspheres are often used as catalyst carriers. Due to their high specific surface area, good thermal stability and chemical stability, they can load active ingredients and are widely used in catalytic reactions in processes such as oil refining and chemical production, such as oil hydroprocessing and catalytic cracking, which helps to improve the efficiency and selectivity of the reaction.

[0003] For example, in the field of adsorption separation, alumina microspheres can be used as adsorbents to selectively adsorb certain impurities or target substances, playing an important role in gas purification, liquid phase adsorption, etc.

[0004] For example, it can adsorb impurities such as carbon dioxide and water during the natural gas purification process, or it can adsorb, separate and purify certain active ingredients in the pharmaceutical industry.

[0005] However, traditional alumina microsphere screening mainly uses manual or semi-automatic screening equipment. Manual screening is inefficient and requires a lot of manpower. It is difficult to ensure screening accuracy. Factors such as operator proficiency and operator fatigue will seriously affect the screening results. It is also prone to human errors, resulting in unstable product quality and unable to meet the requirements of large-scale industrial production for product consistency.

[0006] Although semi-automatic screening equipment improves screening efficiency to a certain extent, it still requires a lot of manual intervention in the screening process, such as replacing the screen, adjusting screening parameters, controlling the feed speed of the material, etc. The operation process is rather cumbersome.

[0007] In conjunction with the above content, it should be noted that: Chinese patent application number CN2024106538187 discloses an automatic screening device for processing alumina micropowder, which is to spray an antistatic agent on the alumina micropowder. Through the action of the antistatic agent, the probability of electrostatic adsorption between the alumina micropowders during the screening process is reduced, which facilitates the screening operation of the alumina micropowder;

[0008] However, antistatic agents may affect the surface properties of alumina. The surface roughness, porosity and other physical properties of alumina microspheres or powders are very important for their applications. When antistatic agents are used, they may fill the pores on the surface of alumina or form a film-like covering on the surface, which will change the surface roughness of alumina, affect its specific surface area, and reduce its adsorption performance. For applications using alumina as an adsorbent, its adsorption capacity will be weakened.

[0009] From a microstructural perspective, the presence of antistatic agents may interfere with the growth or arrangement of alumina crystals. If alumina requires its own specific crystal structure to ensure performance in certain applications, antistatic agents may cause disorder in the crystal structure and affect its mechanical properties, such as hardness and strength, and thus affect its stability and durability when subjected to certain pressure or friction.

[0010] In view of the above technical defects, a solution is now proposed. Summary of the invention

[0011] The purpose of the present invention is to provide an automatic screening device and method for producing alumina microspheres to solve the problems raised.

[0012] To achieve the above-mentioned object, the present invention provides the following technical solutions: an automatic screening device for the production of alumina microspheres, comprising a lifting base, a screening cylinder is arranged on the top of the lifting base, a central driving column extending to the inside of the screening cylinder is arranged at the center of the lifting base, a lower external spray convection mechanism sleeved on the outside of the central driving column is arranged inside the lifting base, and the lower external spray convection mechanism includes an air jet column extending to the inside of the screening cylinder;

[0013] A lower filter ring cover is arranged inside the screening cylinder and is sleeved on the outer peripheral wall of the central driving column. An upper filter ring cover is arranged above the lower filter ring cover. A central shaft rod penetrating the supporting base is arranged at the center of the central driving column. A sealing cover is arranged on the top of the screening cylinder.

[0014] Furthermore, a central supporting column which is sleeved with a central driving column is provided at the top center of the supporting base, an air intake pipe valve which penetrates the supporting base is provided at the top side of the central supporting column, a jet cone which is sleeved on the outer periphery of the central supporting column is provided at the top of the supporting base, a plurality of groups of large particle exhaust valves are provided at the outer periphery of the jet cone, an inclined conical groove is provided at the top of the large particle exhaust valve, a branch pipe connected with the air intake pipe valve is provided inside the jet cone, and a supporting ring connected with the lower external spray convection mechanism is provided at the outside of the top of the supporting base.

[0015] Furthermore, a rotary cylinder connected to the jet column is provided at the bottom of the lower external spray convection mechanism, an air connecting valve is provided on the outer wall of the bottom of the jet column, a plurality of nozzles facing the lower filter ring cover are provided on the inner wall of the jet column, a gathering ring clamped with the inner wall of the lifting base is provided at the outer bottom of the lower external spray convection mechanism, and a plurality of volleyball tubes are provided at the bottom of the gathering ring.

[0016] Furthermore, shaft rings are symmetrically arranged on the outer circumference of the top and bottom of the central driving column, an anti-slip ring located above the shaft ring is arranged on the top of the central driving column, a jet tube is sleeved on the middle of the central driving column, a plurality of groups of air channels arranged in a ring with the central shaft as the central axis are arranged inside the central driving column, and a branch pipe connection is arranged between the air channel and the jet tube.

[0017] Furthermore, a connecting shaft located inside the shaft ring is embedded inside the central driving column, and gear parts meshing with the central shaft and the lower filter ring cover are respectively provided at both ends of the connecting shaft. Multiple sets of docking columns are provided at the bottom of the central driving column, and multiple sets of docking grooves are recessed in the top of the central driving column.

[0018] Furthermore, a driven ring sleeve connected with the shaft ring is arranged inside the lower filter ring cover, a spiral sheet is arranged on the outer wall of the driven ring sleeve, an upper filter ring cover in contact with the bottom of the sealing cover is arranged above the lower filter ring cover, an upper external spray convection mechanism is arranged on the outer peripheral wall of the upper filter ring cover, and a ring platform is arranged on the top of the upper filter ring cover.

[0019] Furthermore, a dust collecting hood is arranged on the inner wall of the top of the screening cylinder, and a plurality of dust exhaust pipes penetrating the screening cylinder are arranged at the bottom of the dust collecting hood.

[0020] Furthermore, an exhaust ring is provided on the top edge of the cover, a feed valve is provided in the central area of ​​the top of the cover, a filter frame with an outward spray convection mechanism is provided at the bottom of the cover, a suction port extending between the filter frame and the screening cylinder is provided at the bottom of the exhaust ring, and a special dust exhaust pipe valve connected to an external air supply device and a waste residue container is provided at the top of the exhaust ring.

[0021] The present invention also provides an automatic screening method for producing alumina microspheres, comprising the following steps:

[0022] Preparation for ball entry: According to the production needs of alumina microspheres, the external connection equipment of the automatic screening device is inspected and processed to ensure the smooth operation of the automatic screening of alumina microspheres;

[0023] Preliminary screening: Preliminary screening of extremely small particles and dust on the alumina microspheres, and guiding the spiral to roll to promote the full explosion of the alumina microsphere particles;

[0024] Secondary screening treatment: The remaining alumina microspheres are screened for secondary moderate particles, and the remaining particles after screening are centrally guided and discharged to achieve automated multi-stage screening treatment of alumina microspheres.

[0025] The beneficial effects of the present invention are:

[0026] 1. The present invention is to overhaul the external connection equipment and production equipment of the automatic screening device in advance to ensure smooth automatic screening process of alumina microspheres, reduce the risk of failure, and ensure stable operation of the equipment; through the different mesh sizes of the upper filter ring cover and the lower filter ring cover, the extremely small particles and moderate particles in the alumina microspheres are effectively screened respectively, to achieve accurate classification and meet different needs.

[0027] 2. The present invention not only can fully disperse the alumina microsphere particles, but also can promote the fall of impurities on the surface and in the micropores, and at the same time make some cracked microspheres break in advance, thereby improving the purity of the product and forming multiple impurity cleaning through multiple methods such as spiral blade rolling, ion wind gas propulsion, and jet column reciprocating jet.

[0028] 3. The present invention forms a stable airflow environment by constructing a pneumatic cycle of downward spraying and upward suction, which not only achieves static electricity elimination and air purification, but also promotes the integration of dust particles and alumina micropowder into ionized wind gas, which is convenient for centralized recycling and reuse, improves resource utilization, and optimizes airflow utilization; the rotary cylinder of the upper external spray convection mechanism drives the jet column to rotate, realizing automated reciprocating jet processing; the external air supply equipment can be replaced according to actual needs to adapt to different production scenarios, thereby improving the flexibility and adaptability, automation and adjustability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the lifting base of the present invention;

[0032] Figure 3 It is a structural schematic diagram of the lower external spray convection mechanism of the present invention;

[0033] Figure 4 It is a schematic diagram of the structure of the jet column and the lower filter ring cover of the present invention;

[0034] Figure 5 It is a schematic structural diagram of the lower filter ring cover and the central drive column of the present invention;

[0035] Figure 6 It is a schematic diagram of the structure of the spiral sheet of the present invention;

[0036] Figure 7It is a schematic diagram of the three-dimensional structure of the central driving column of the present invention;

[0037] Figure 8 It is a schematic diagram of the internal structure of the central driving column of the present invention;

[0038] Fig. 9 It is a schematic cross-sectional view of the screening cylinder and the central driving column of the present invention;

[0039] Fig.10 It is a structural schematic diagram of the lower filter ring cover of the present invention;

[0040] Fig.11 It is a schematic structural diagram of the sealing cover of the present invention.

[0041] Figure numerals: 1. lifting base; 101. large particle discharge valve; 102. supporting ring; 103. central supporting column; 104. jet cone; 2. screening cylinder; 201. dust collecting hood; 3. sealing cover; 301. vacuum ring; 302. inlet valve; 303. filter frame; 4. lower external spray convection mechanism; 401. rotary cylinder; 402. jet column; 403. collecting ring; 5. lower filter ring cover; 501. driven ring sleeve; 502. spiral sheet; 503. upper filter ring cover; 6. central driving column; 601. docking column; 602. central shaft; 603. air channel; 604. shaft ring; 605. anti-slip ring; 606. jet cylinder; 607. connecting shaft. DETAILED DESCRIPTION

[0042] 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.

[0043] Example 1: Please refer to Figure 1 - Fig.11 As shown, this embodiment is an automatic screening device for the production of alumina microspheres, including a lifting base 1, a screening cylinder 2 is arranged on the top of the lifting base 1, a central driving column 6 extending to the inside of the screening cylinder 2 is arranged at the center of the lifting base 1, and a lower external spray convection mechanism 4 is arranged inside the lifting base 1 and is sleeved on the outside of the central driving column 6. The lower external spray convection mechanism 4 includes a jet column 402 extending to the inside of the screening cylinder 2.

[0044] According to the production needs of alumina microspheres, the production equipment is overhauled in advance, and the output end of the external air supply equipment is connected to the air inlet valve via a dedicated air supply pipeline, and the input end of the external air supply equipment is connected to the exhaust ring 301 through a dedicated dust exhaust pipe valve to realize the pneumatic circulation of downward spraying and upward extraction. The external air supply equipment is one of the ion blowers, which is replaced according to actual needs. The alumina microspheres are connected to the storage container through a pipeline and are guided into the screening cylinder 2 through the feed valve 302.

[0045] A driven ring sleeve 501 which is sleeved with the shaft ring 604 is arranged inside the lower filter ring cover 5, and a spiral sheet 502 is arranged on the outer wall of the driven ring sleeve 501. An upper filter ring cover 503 which contacts the bottom of the cover 3 is arranged above the lower filter ring cover 5, an upper external spray convection mechanism is arranged on the outer peripheral wall of the upper filter ring cover 503, and a ring platform is arranged on the top of the upper filter ring cover 503.

[0046] When the alumina microspheres enter the screening cylinder 2, they first fall on the surface of the spiral sheet 502 of the upper filter ring cover 503. The alumina microspheres are first affected by the main structure of the spiral sheet 502, causing the alumina microspheres to roll along the surface of the spiral sheet 502. Then, they are affected by the main shape of the spiral sheet 502, causing the rolling alumina microspheres to contact the inner wall of the upper filter ring cover 503 under the action of inertia, so that the fine spheres and impurity dust in the alumina microspheres are separated and sieved out along the filter mesh micropores of the upper filter ring cover 503, thus forming a preliminary screening to process the extremely small particles and dust in the alumina microspheres.

[0047] Axle rings 604 are symmetrically arranged on the top and bottom peripheries of the central driving column 6, an anti-slip ring 605 is arranged on the top of the central driving column 6 and is located above the axle ring 604, a jet tube 606 is sleeved on the middle of the central driving column 6, a plurality of air channels 603 arranged in a ring shape with the central shaft 602 as the central axis are arranged inside the central driving column 6, and a branch pipe connection is arranged between the air channel 603 and the jet tube 606.

[0048] The driven ring sleeve 501 in the upper filter ring cover 503 is meshed with the central shaft 602 through the gear parts and the connecting shaft 607, thereby driving the spiral piece 502 to rotate along the surface of the shaft ring 604, so that the spiral piece 502 rotates and the aluminum oxide microspheres roll from top to bottom due to their own weight, so that the aluminum oxide microspheres form an inertial force that rolls outward in a spiral shape.

[0049] The external air supply device guides the ion wind gas along the inlet pipe valve into the air channel 603, and the air channel 603 diverts the ion wind gas into the micropores of the jet tube 606 through the branch pipe, thereby forming a circular airflow that diffuses from the inside to the outside with the jet tube 606 as the central axis, and further pushes the passing alumina microspheres to diffuse outward using the ion wind gas and impact on the inner wall of the upper filter ring cover 503, thereby accelerating the screening of extremely small particles in the alumina microspheres, and during the rolling and impact of the alumina microspheres, the impurities attached to the micropores on the surface of the alumina microspheres are separated, which constitutes the first cleaning of the alumina microspheres.

[0050] A rotary cylinder 401 connected to a jet column 402 is arranged at the bottom of the lower external spray convection mechanism 4, an air connection valve is arranged on the outer wall of the bottom of the jet column 402, a plurality of nozzles facing the lower filter ring cover 5 are arranged on the inner wall of the jet column 402, a gathering ring 403 clamped with the inner wall of the lifting base 1 is arranged at the outer bottom of the lower external spray convection mechanism 4, and a plurality of volleyball tubes are arranged at the bottom of the gathering ring 403.

[0051] The upper external spray convection mechanism is started synchronously, and the rotary cylinder 401 in the upper external spray convection mechanism drives the multiple groups of jet columns 402 to rotate. The jet columns 402 rotate 90 degrees along the outer wall of the upper filter ring cover 503 and then reset again, thereby constituting a reciprocating jet treatment on the outer wall of the upper filter ring cover 503, and the jet columns 402 are connected to the output end pipeline of the external air supply device through the air connection valve and the connecting hose, thereby guiding the ion wind gas to blow along the nozzle of the jet column 402 to the upper filter ring cover 503, thereby forming a vertical air flow strip from the outside to the inside;

[0052] The gas pressure of the vertical air flow jet ion wind is greater than the annular air flow pressure of the jet tube 606, thereby pushing the passing alumina microspheres toward the jet tube 606, causing the alumina microspheres to continuously switch flow trajectories on the spiral blades 502, thereby promoting their accelerated rolling and mutual collision and contact, promoting the falling off of impurities adsorbed in the micropores of the alumina microspheres, and causing some microspheres with cracks to break into extremely small particles in advance.

[0053] After the initial screening, the extremely small particles of alumina microspheres fall into the collecting ring 403 along the mesh of the upper filter ring cover 503. Affected by the inclined angle of the inner wall of the collecting ring 403, the fallen extremely small particles of alumina microspheres are guided to gather in the volleyball tube area, and then guided to the extremely small particles of alumina microspheres collection container connected to the external pipeline.

[0054] The remaining alumina microspheres roll along the surface of the spiral sheet 502 until they fall onto the spiral sheet 502 of the lower filter ring cover 5. The mesh number of the lower filter ring cover 5 is greater than the mesh number of the upper filter ring cover 503. The lower filter ring cover 5 is used to screen and discharge moderate particles of the alumina microspheres. As the alumina microspheres roll along the spiral sheet 502, the moderate particles pass through the mesh of the lower filter ring cover 5 and fall onto the aggregate ring 403. The aggregate ring 403 guides the moderate particles into an external dedicated storage container through the exhaust pipe.

[0055] The alumina microspheres intercepted by rolling inside the lower filter ring cover 5 roll along the surface of the spiral sheet 502 and enter the inside of the lifting base 1, and scatter along the surface of the jet cone 104 until they bounce and gather inside the inclined cone groove of the large particle discharge valve 101, and are guided by the large particle discharge valve 101 to be discharged into a dedicated storage container.

[0056] A lower filter ring cover 5 is arranged inside the screening cylinder 2 and is sleeved on the outer peripheral wall of the central driving column 6. An upper filter ring cover 503 is arranged above the lower filter ring cover 5. A central shaft rod 602 that passes through the supporting base 1 is arranged at the center of the central driving column 6. A sealing cover 3 is arranged on the top of the screening cylinder 2.

[0057] A central supporting column 103 which is sleeved with the central driving column 6 is arranged at the top center of the supporting base 1, an air intake pipe valve which passes through the supporting base 1 is arranged on the top side of the central supporting column 103, a jet cone 104 which is sleeved on the outer periphery of the central supporting column 103 is arranged at the top of the supporting base 1, a plurality of groups of large particle exhaust valves 101 are arranged on the outer periphery of the jet cone 104, an inclined conical groove is arranged on the top of the large particle exhaust valve 101, a branch pipe connected with the air intake pipe valve is arranged inside the jet cone 104, and a supporting ring 102 which is connected with the lower external spray convection mechanism 4 is arranged on the outside of the top of the supporting base 1.

[0058] Before the alumina microspheres are squeezed into the screening cylinder 2, the ion wind gas is guided into the screening device. Part of the ion wind gas goes along the air inlet valve, and the air inlet valve guides the ion wind gas into the jet cone 104 through a branch pipe. The jet cone 104 guides the ion wind to continuously spray from bottom to top, causing the air pressure at the bottom of the screening cylinder 2 to continue to increase.

[0059] Embodiment 2: This embodiment is an automatic screening device for the production of alumina microspheres, including a central driving column 6 with a connecting shaft 607 located inside a shaft ring 604 embedded therein, and gear parts meshing with the central shaft 602 and the lower filter ring cover 5 are respectively provided at both ends of the connecting shaft 607, a plurality of docking columns 601 are provided at the bottom of the central driving column 6, and a plurality of docking grooves are provided in a recessed manner at the top of the central driving column 6.

[0060] A dust collecting cover 201 is arranged on the inner wall of the top of the screening cylinder 2, and a plurality of dust exhaust pipes penetrating the screening cylinder 2 are arranged at the bottom of the dust collecting cover 201. The air extraction ring 301 extracts the ionized wind gas at the top of the screening cylinder 2 through the suction port and returns it to the external air supply device. The external air supply device is provided with a filtering mechanism, which guides the ionized wind gas for secondary use after filtering.

[0061] At the same time, affected by the continuous jetting of ionized wind gas by the jet cone 104, the continuous suction of ionized wind gas by the suction port, and the continuous jetting of ionized wind by the jet cylinder 606 and the jet column 402, the internal environment of the screening cylinder 2 is continuously changed, forming a static elimination scene / air purification scene / airflow stabilization scene, and an overall circulating flow trajectory of the airflow, which causes the dust particles detached from the alumina microspheres and part of the alumina micropowder to dissolve into the ionized wind gas, and are continuously extracted by the suction port, and are centrally collected by an external filtering mechanism to facilitate the recycling and reuse of the alumina microsphere fragments.

[0062] An exhaust ring 301 is provided at the top edge of the cover 3, a feed valve 302 is provided in the central area of ​​the top of the cover 3, a filter frame 303 with an upward outward spray convection mechanism is provided at the bottom of the cover 3, a suction port extending between the filter frame 303 and the screening cylinder 2 is provided at the bottom of the exhaust ring 301, and a special dust exhaust pipe valve connected to the external air supply equipment and the waste residue container is provided at the top of the exhaust ring 301.

[0063] Combining Example 1 and Example 2, it can be seen that the present invention ensures smooth automatic screening of alumina microspheres and reduces malfunctions by overhauling the equipment in advance, and utilizes the upper and lower filter ring covers 5 with different mesh sizes for precise grading and screening to meet diverse needs; multiple impurity cleaning is achieved by means of spiral blades 502 rolling, ion wind propulsion, and jet column 402 jetting to improve product purity; a lower-spray and upper-pump pneumatic cycle is constructed to achieve static electricity elimination and air purification, optimize airflow utilization, and improve resource recovery utilization rate; the upper external spray convection mechanism automatically sprays, and the external air supply equipment can be replaced as needed to improve the automation level and flexibility of the device to adapt to different production scenarios.

[0064] Embodiment 3: This embodiment is an automatic screening method for producing alumina microspheres, comprising the following steps:

[0065] Preparation for ball entry: According to the production needs of alumina microspheres, the external connection equipment of the automatic screening device is inspected and processed to ensure the smooth operation of the automatic screening of alumina microspheres;

[0066] Preliminary screening: Preliminary screening of extremely small particles and dust on the alumina microspheres, and guiding the spiral to roll to promote the full explosion of the alumina microsphere particles;

[0067] Secondary screening treatment: The remaining alumina microspheres are screened for secondary moderate particles, and the remaining particles after screening are centrally guided and discharged to achieve automated multi-stage screening treatment of alumina microspheres.

[0068] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An automatic screening device for producing alumina microspheres, comprising a supporting base (1), characterized in that: A screening cylinder (2) is arranged on the top of the supporting base (1), a central driving column (6) extending into the interior of the screening cylinder (2) is arranged at the center of the supporting base (1), a lower external spray convection mechanism (4) sleeved on the outside of the central driving column (6) is arranged inside the supporting base (1), and the lower external spray convection mechanism (4) includes a jet column (402) extending into the interior of the screening cylinder (2); The screening cylinder (2) is provided with a lower filter ring cover (5) sleeved on the outer peripheral wall of the central driving column (6), an upper filter ring cover (503) is provided above the lower filter ring cover (5), a central shaft (602) penetrating the supporting base (1) is provided at the center of the central driving column (6), and a sealing cover (3) is provided on the top of the screening cylinder (2).

2. The automatic screening device for producing alumina microspheres according to claim 1, characterized in that: A central support column (103) sleeved with a central driving column (6) is arranged at the center of the top of the supporting base (1); an air intake pipe valve penetrating the supporting base (1) is arranged on the side of the top of the central support column (103); a jet cone (104) sleeved on the outer periphery of the central support column (103) is arranged at the top of the supporting base (1); a plurality of groups of large particle exhaust valves (101) are arranged on the outer periphery of the jet cone (104); an inclined cone groove is arranged on the top of the large particle exhaust valve (101); a branch pipe connected to the air intake pipe valve is arranged inside the jet cone (104); and a support ring (102) connected to the lower external jet convection mechanism (4) is arranged on the outside of the top of the supporting base (1).

3. The automatic screening device for producing alumina microspheres according to claim 1, characterized in that: A rotary cylinder (401) connected to an air jet column (402) is arranged at the bottom of the lower external spray convection mechanism (4); an air connection valve is arranged on the outer wall of the bottom of the air jet column (402); a plurality of nozzles facing the lower filter ring cover (5) are arranged on the inner wall of the air jet column (402); a collection ring (403) clamped with the inner wall of the lifting base (1) is arranged at the outer bottom of the lower external spray convection mechanism (4); and a plurality of volleyball tubes are arranged at the bottom of the collection ring (403).

4. The automatic screening device for producing alumina microspheres according to claim 1, characterized in that: The top and bottom peripheries of the central driving column (6) are symmetrically provided with shaft rings (604); the top of the central driving column (6) is provided with an anti-slip ring (605) located above the shaft ring (604); the middle of the central driving column (6) is sleeved with a jet tube (606); the interior of the central driving column (6) is provided with a plurality of groups of air channels (603) arranged in a ring shape with the central shaft (602) as the central axis; and a branch pipe connection is provided between the air channel (603) and the jet tube (606).

5. The automatic screening device for producing alumina microspheres according to claim 4, characterized in that: A connecting shaft (607) located inside the shaft ring (604) is embedded inside the central driving column (6), and gear parts that mesh with the central shaft (602) and the lower filter ring cover (5) are respectively arranged at both ends of the connecting shaft (607). A plurality of docking columns (601) are arranged at the bottom of the central driving column (6), and a plurality of docking grooves are arranged in a recessed manner at the top of the central driving column (6).

6. The automatic screening device for producing alumina microspheres according to claim 5, characterized in that: A driven ring sleeve (501) sleeved with the shaft ring (604) is arranged inside the lower filter ring cover (5), a spiral sheet (502) is arranged on the outer wall of the driven ring sleeve (501), an upper filter ring cover (503) in contact with the bottom of the sealing cover (3) is arranged above the lower filter ring cover (5), an upper external spray convection mechanism is arranged on the outer peripheral wall of the upper filter ring cover (503), and a ring platform is arranged on the top of the upper filter ring cover (503).

7. The automatic screening device for producing alumina microspheres according to claim 1, characterized in that: A dust collecting hood (201) is arranged on the inner wall of the top of the screening cylinder (2), and a plurality of groups of dust exhaust pipes penetrating the screening cylinder (2) are arranged at the bottom of the dust collecting hood (201).

8. The automatic screening device for producing alumina microspheres according to claim 1, characterized in that: The top edge of the sealing cover (3) is provided with an exhaust ring (301), the top center area of ​​the sealing cover (3) is provided with a feed valve (302), the bottom of the sealing cover (3) is provided with a filter frame (303) facing the upward outward spray convection mechanism, the bottom of the exhaust ring (301) is provided with a suction port extending between the filter frame (303) and the screening cylinder (2), and the top of the exhaust ring (301) is provided with a special dust exhaust pipe valve connected to an external air supply device and a waste residue container.

9. An automatic screening method for producing alumina microspheres, using the automatic screening device for producing alumina microspheres as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: Preparation for ball entry: According to the production needs of alumina microspheres, the external connection equipment of the automatic screening device is inspected and processed to ensure the smooth operation of the automatic screening of alumina microspheres; Preliminary screening: Preliminary screening of extremely small particles and dust on the alumina microspheres, and guiding the spiral to roll to promote the full explosion of the alumina microsphere particles; Secondary screening treatment: The remaining alumina microspheres are screened for secondary moderate particles, and the remaining particles after screening are centrally guided and discharged to achieve automated multi-stage screening treatment of alumina microspheres.

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