Multi-layer screening device for alumina powder

Abstract

The utility model discloses an alumina powder multilayer screening device which comprises a base, a support is fixedly installed at the top of the base, a shell is fixedly installed at the top of the support, three filtering discharging grooves are formed in the front face of the shell, and a discharging groove is formed in the lower end of the back face of the shell. By the adoption of the structure, in the application period of the device, in the aspect of screening and collecting efficiency, the multiple layers of inclined filter screens are matched with the vibration motor, the alumina powder screening time is remarkably prolonged, and the screening precision is greatly improved. Due to the unique staggered discharging guide pipe design, guide pipe interference is avoided, the equipment space layout is optimized, the impurity flowing resistance is reduced, and smooth discharging is guaranteed. The discharging guide pipes at different positions accurately correspond to the filter screen, directional discharging of impurities with different particle sizes is achieved, an operator can rapidly collect the impurities in a classified mode, the problem of impurity gathering is thoroughly solved, the follow-up treatment process is simplified, and the overall working efficiency is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of alumina powder screening technology, and specifically relates to a multi-layer screening device for alumina powder. Background Technology

[0002] With the deepening of the global low-carbon economy and the vigorous development of the industrial system, aluminum, as an important metal with the characteristics of being lightweight, high-strength, and recyclable, is in high demand in fields such as new energy vehicles, aerospace, and green buildings. As the core precursor of aluminum production, the efficient preparation and fine processing technology of alumina powder is becoming increasingly critical. Among them, screening and filtration is the core process to ensure the uniformity of alumina powder particle size and product quality, and the performance of its equipment directly affects the overall efficiency of the aluminum industry chain.

[0003] Currently, the application of alumina powder screening equipment in the industrial field has formed a certain technical system. Taking the multi-layer alumina powder screening device disclosed in Chinese Patent No. "CN220574010U" as an example, this device optimizes the feeding structure to extend the flow path of alumina powder raw materials on the screen, and combines a vibrating motor and a transmission rod to enhance the screening effect, thus solving to a certain extent the problem of mixed particles of different sizes flowing out due to insufficient material residence time in traditional screening equipment.

[0004] However, in actual industrial applications, existing screening technologies still have significant limitations: First, their multi-layer screen structure design lacks an impurity diversion mechanism. The vertically arranged screens make it difficult to effectively separate impurities of different particle sizes during the screening process, requiring additional secondary sorting in the collection stage, which significantly increases labor costs and production cycle. Second, during the filtration and screening process, extremely fine particles in the powder can easily overflow through the gaps, not only wasting raw materials and increasing production costs, but also potentially causing dust pollution in the workshop, posing a potential threat to the health and safety of operators. It is evident that the existing technology has certain defects in its overall application, and therefore, it needs to be improved and designed. Utility Model Content

[0005] In view of the problems mentioned in the background art, the purpose of this utility model is to provide a multi-layer sieving device for alumina powder to solve the problems raised in the background art.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A multi-layer alumina powder screening device includes a base, a support fixedly mounted on the top of the base, a housing fixedly mounted on the top of the support, three filter discharge troughs on the front of the housing, a discharge trough at the lower back of the housing, a screening mechanism movably connected inside the housing, a vibrating motor fixedly mounted on the bottom of the housing, the vibrating end of the vibrating motor connected to the bottom of the screening mechanism, the discharge ends of the screening mechanism extending to the outside of the housing through the filter discharge troughs, the screening discharge ends of the screening mechanism extending to the outside of the housing through the discharge trough, a dust removal mechanism fixedly mounted on one side of the top of the housing, and a feed hopper fixedly connected to the side of the top of the housing away from the dust removal mechanism.

[0008] The screening mechanism includes a frame, which is fixedly installed on the top vibrating end of the vibrating motor. Inside the frame, a first filter screen, a second filter screen, and a third filter screen are fixedly installed in a linear arrangement at equal intervals. The first, second, and third filter screens are all inclined. The output ends of the first, second, and third filter screens extend to the outside of the outer shell through a filter discharge trough. A discharge guide plate is fixedly installed at the bottom of the first, second, and third filter screens inside the frame. The output end of the bottom discharge guide plate is fixedly connected to a qualified filter discharge frame, which extends to the outside of the outer shell through a discharge trough.

[0009] Furthermore, the screening mechanism also includes a material guiding group, which includes a non-conforming filter guide frame. The non-conforming filter guide frame is fixedly installed on the inclined downward output ends of the first filter screen, the second filter screen, and the third filter screen. The output ends of the non-conforming filter guide frames are all fixedly connected to discharge conduits. Among the three discharge conduits, the output end of the top discharge conduit is located on the rear side, the output end of the middle discharge conduit is located in the middle, and the output end of the bottom discharge conduit is located on the front side. The discharge conduits are made of stainless steel and have a rectangular cross-section.

[0010] Furthermore, the material guiding assembly also includes an inclined guide plate, which is installed at an angle on the lower end of the outer shell near the filter discharge trough. The top of the inclined guide plate has inclined guide grooves arranged linearly at equal intervals. The top input ends of the three inclined guide grooves correspond to the output ends of the three discharge guide pipes, respectively. The inclined guide plate is inclined as a whole, and the outer corners of the inclined guide plate are all rounded.

[0011] Furthermore, the dust removal mechanism includes a dust removal box, which is fixedly installed on the top side of the outer shell. A suction fan is fixedly installed on the top of the dust removal box, and the input end of the suction fan is connected to the inside of the dust removal box. A filter assembly is slidably connected inside the dust removal box, and the input end of the dust removal box is connected to the inside of the outer shell.

[0012] Furthermore, the filter assembly includes a filter screen box, which is slidably connected to the inside of the dust collector box. A sealing door is fixedly installed on the outside of the filter screen box, which covers the outlet of the dust collector box. A sealing gasket is fixedly connected to the side of the sealing door near the filter screen box.

[0013] Furthermore, a fixed arm is fixedly installed on the middle of the rear side of the sealed door, and a fixed screw is threaded to the outer end of the fixed arm. A suction hopper is fixedly connected to the top of the outer shell, and the output end of the suction hopper is connected to the interior of the dust collection box. The end of the fixed screw passes through the fixed arm.

[0014] Furthermore, a limiting hole is provided on the back of the dust collector near the fixed arm, and the end of the fixing screw is inserted into the limiting hole. The fixing screw is a hand-tightening screw.

[0015] In summary, the present invention has the following main advantages:

[0016] Firstly, during the application of this equipment, in terms of screening and collection efficiency, this device, through multi-layer inclined filter screens combined with a vibrating motor, significantly extends the screening time of alumina powder and greatly improves screening accuracy. The unique staggered discharge conduit design not only avoids conduit interference and optimizes the equipment's spatial layout but also reduces impurity flow resistance, ensuring smooth discharge. The precise correspondence between the discharge conduits and filter screens at different positions enables the directional discharge of impurities of different particle sizes. Operators can quickly classify and collect these impurities, thoroughly solving the problem of impurity aggregation, simplifying subsequent processing procedures, and greatly improving overall work efficiency.

[0017] Secondly, regarding environmental protection, energy conservation, and safety during the application of this equipment, the dust removal mechanism effectively adsorbs fine powder released during the screening process, reducing raw material waste and production costs, while also preventing dust pollution in the workshop. The filter screen is easy to disassemble and clean, and the powder can be recycled periodically, achieving efficient resource utilization. Furthermore, this device eliminates dust hazards at the source, ensuring the health of operators and safe production in the workshop. The overall design optimizes the entire alumina powder screening process, combining practicality and economy, providing a reliable guarantee for the efficient production of alumina powder. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the rear view structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the screening mechanism of this utility model;

[0021] Figure 4This is a schematic diagram of the disassembled structure of the screening mechanism of this utility model;

[0022] Figure 5 This is a bottom view schematic diagram of the screening mechanism of this utility model.

[0023] Reference numerals: 1. Base; 2. Support; 3. Outer shell; 4. Filter discharge chute; 5. Discharge chute; 6. Screening mechanism; 61. Frame; 62. First filter screen; 63. Second filter screen; 64. Third filter screen; 65. Qualified filter discharge frame; 66. Guide assembly; 661. Unqualified filter guide frame; 662. Discharge guide pipe; 663. Inclined guide plate; 664. Inclined guide chute; 67. Discharge guide plate; 7. Vibrating motor; 8. Dust removal mechanism; 81. Dust removal box; 82. Fan; 83. Filter assembly; 831. Filter screen box; 832. Sealing door; 833. Fixed arm; 834. Fixed screw; 835. Suction hopper; 836. Limiting hole; 9. Feed hopper. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example

[0026] Please refer to Figure 1-5 This embodiment of an alumina powder multilayer screening device includes a base 1, a support 2 fixedly installed on the top of the base 1, a housing 3 fixedly installed on the top of the support 2, three filter discharge troughs 4 opened on the front of the housing 3, a discharge trough 5 opened at the lower back of the housing 3, a screening mechanism 6 movably connected inside the housing 3, a vibration motor 7 fixedly installed at the bottom of the housing 3, the vibration end of the vibration motor 7 being connected to the bottom of the screening mechanism 6, the discharge ends of the screening mechanism 6 extending to the outside of the housing 3 through the filter discharge troughs 4, the screening discharge ends of the screening mechanism 6 extending to the outside of the housing 3 through the discharge trough 5, a dust removal mechanism 8 fixedly installed on one side of the top of the housing 3, and a feed hopper 9 fixedly connected to the side of the top of the housing 3 away from the dust removal mechanism 8.

[0027] The screening mechanism 6 includes a frame 61, which is fixedly installed on the top vibrating end of the vibrating motor 7. Inside the frame 61, a first filter screen 62, a second filter screen 63, and a third filter screen 64 are linearly arranged at equal intervals and fixedly installed sequentially. All three filters are inclined. The output ends of the first filter screen 62, the second filter screen 63, and the third filter screen 64 extend outside the outer casing 3 through a filter discharge trough 4. The first filter screen 62, the second filter screen 63, and the third filter screen 64 are located within the frame 61. Each of the three filter screens 64 has a discharge guide plate 67 fixedly installed at its bottom. The bottom discharge guide plate 67 is fixedly connected to a qualified discharge frame 65 at its output end. The qualified discharge frame 65 extends to the outside of the outer shell 3 through the discharge trough 5. When this multi-layer alumina powder screening device is working, alumina powder enters the outer shell 3 through the feed hopper 9 and falls directly onto the first filter screen 62 of the screening mechanism 6. Since the first filter screen 62, the second filter screen 63, and the third filter screen 64 are all inclined, the alumina powder is... Under the influence of gravity, the powder flows downwards along the surface of the filter screen. Simultaneously, the vibration motor 7 at the bottom of the outer casing 3 starts, transmitting vibration force to the frame 61 of the screening mechanism 6. This causes the first filter screen 62, the second filter screen 63, and the third filter screen 64 within the frame 61 to vibrate, resulting in the alumina powder being fully shaken on the filter screens. This effectively separates powders of different particle sizes. Impurities larger than the mesh size of the first filter screen 62 are intercepted and discharged through the filter outlet 4 via the output end of the first filter screen 62. Powders that fail to pass through the first filter screen 62 are discharged through the filter discharge trough 4. Impurities from the second filter screen 63 and the third filter screen 64 are discharged through the corresponding filter screen output end and the filter discharge trough 4 in the same manner. Alumina powder that meets the particle size requirements is screened by the three layers of filter screens and falls into the qualified discharge frame 65 connected to the output end of the bottom discharge guide plate 67 after passing through the discharge guide plate 67 below each filter screen. Finally, it is discharged through the discharge trough 5 at the lower back of the outer shell 3. During the screening process, the dust removal mechanism 8 at the top of the outer shell 3 operates synchronously to adsorb the generated fine powder in time and prevent the powder from escaping.

[0028] Please refer to Figures 1-3The screening mechanism 6 also includes a material guiding group 66, which includes a non-conforming filter guide frame 661. The non-conforming filter guide frame 661 is fixedly installed at the downward-sloping output ends of the first filter screen 62, the second filter screen 63, and the third filter screen 64. Each output end of the non-conforming filter guide frame 661 is fixedly connected to a discharge conduit 662. The output end of the top discharge conduit 662 is located at the rear, while the output end of the middle discharge conduit 662 is located in the middle. The discharge conduit 662 at the bottom is located at the front. The discharge conduit 662 is made of stainless steel and has a rectangular cross-section. The guide assembly 66 also includes an inclined guide plate 663, which is installed at an angle on the lower end of the outer casing 3 near the filter discharge trough 4. The top of the inclined guide plate 663 has inclined guide grooves 664 arranged linearly at equal intervals. The top input ends of the three inclined guide grooves 664 correspond to the output ends of the three discharge conduits 662, respectively. The inclined guide plate 663 is inclined as a whole. The external corners of the inclined guide plate 663 are all rounded. During the use of this device, when alumina powder is screened by the first filter screen 62, the second filter screen 63, and the third filter screen 64, the unqualified impurities intercepted by each filter screen slide down into the corresponding fixed unqualified filter guide frame 661, and are then discharged through the connected discharge conduit 662. Because the three discharge conduits 662 are staggered in the top rear side, middle middle, and bottom front side, the impurities filtered by different filters can be arranged in an orderly manner according to particle size. These impurities flow along the discharge conduit 662 and precisely fall into the corresponding inclined guide groove 664 on the inclined guide plate 663. Because the inclined guide plate 663 is tilted as a whole, the impurities slide down quickly along the inclined guide groove 664 under the action of gravity, completing the discharge process. In addition, the rounded design of the outer corner of the inclined guide plate 663 effectively reduces the jamming and residue of impurities during flow. The rectangular cross-section stainless steel discharge conduit 662 not only ensures structural strength but also optimizes the impurity conveying path, ensuring that the entire material guiding process is smooth and efficient.

[0029] Please refer to Figures 1-5The dust removal mechanism 8 includes a dust collection box 81, which is fixedly installed on the top side of the outer casing 3. A suction fan 82 is fixedly installed on the top of the dust collection box 81, and the input end of the suction fan 82 is connected to the interior of the dust collection box 81. A filter assembly 83 is slidably connected inside the dust collection box 81, and the input end of the dust collection box 81 is connected to the interior of the outer casing 3. The filter assembly 83 includes a filter screen box 831, which is slidably connected to the interior of the dust collection box 81. A sealing door 832 is fixedly installed on the outside of the filter screen box 831 to seal the dust collection box. Door 832 covers the outlet of dust collector 81. A sealing gasket is fixedly connected to the side of the sealing door 832 near the filter box 831. A fixing arm 833 is fixedly installed in the middle of the rear side of the sealing door 832. A fixing screw 834 is threaded to the outer end of the fixing arm 833. A suction hopper 835 is fixedly connected to the top inside the outer casing 3. The output end of the suction hopper 835 is connected to the inside of the dust collector 81. The end of the fixing screw 834 passes through the fixing arm 833. A limit hole 8 is provided on the back of the dust collector 81 near the fixing arm 833. 36. The end of the fixing screw 834 is inserted into the limiting hole 836. The fixing screw 834 is a hand-tightening screw. During the application of this device, when the dust removal mechanism 8 is working, the suction fan 82 starts and forms a negative pressure suction, which drives the air inside the outer casing 3 into the dust collection box 81 through the suction hopper 835. During this process, the fine alumina powder generated by sieving is sucked in along with the airflow. When the dust-laden airflow enters the dust collection box 81, the filter box 831 intercepts and filters the powder in the airflow. The purified air is then passed through the suction fan 836. 2. The installation of the discharge and sealing door 832 and sealing gasket ensures that the dust collection box 81 is in a sealed state, preventing the leakage of unfiltered dust-laden gas. When it is necessary to clean the powder collected in the filter box 831, the operator can loosen the hand-tight fixing screw 834 so that its end is disengaged from the limiting hole 836. Then, the filter box 831 can be pulled out along the sliding connection structure. After cleaning, it can be reinserted and the fixing screw 834 can be tightened to ensure the continuous and stable operation of the dust collection mechanism 8, and to achieve effective collection and purification of the powder released during the screening process.

[0030] Operating principle and advantages: During the application of this device, alumina powder can be fed into the housing 3 through the feed hopper 9. After entering the housing 3, the alumina powder falls onto the first filter screen 62 of the screening mechanism 6. Since the first filter screen 62, the second filter screen 63, and the third filter screen 64 are all inclined, the alumina powder flows downward along the filter screen under its own gravity. At the same time, the vibration motor 7 is started, transmitting vibration force to the frame 61 and the filter screen, causing the alumina powder to be fully shaken on the filter screen. Powders of different particle sizes are effectively separated. Impurities with a particle size larger than the mesh size of the first filter screen 62 are intercepted and pass through the unqualified filter guide frame 661 and the discharge guide pipe 662 at the output end of the first filter screen 62, and then through the inclined... The corresponding inclined guide groove 664 on the guide plate 663 discharges the outer shell 3; impurities that fail to pass through the second filter screen 63 are discharged in the same way through the middle discharge pipe 662 and the inclined guide groove 664; impurities that fail to pass through the third filter screen 64 are discharged from the bottom discharge pipe 662. After being screened by three layers of filter screens, the alumina powder that meets the particle size requirements falls into the qualified discharge frame 65 through the discharge guide plate 67 and is finally discharged from the discharge trough 5. At the same time, the suction fan 82 runs and sucks the fine powder generated during the screening process into the dust collection box 81 through the suction hopper 835. The dust is filtered by the filter screen box 831, and the purified air is discharged. The collected powder can be cleaned from the filter screen box 831 periodically.

[0031] Furthermore, the staggered design of its discharge conduit output end avoids mutual interference between the discharge conduits 662 in the same vertical or horizontal plane, making the internal material guiding structure of the outer shell 3 more compact and reasonable, effectively utilizing the equipment installation space, especially suitable for arrangement in limited workshop space, while reducing the bending angle of the conduit, reducing the flow resistance of alumina powder impurities in the conduit, and ensuring smooth discharge.

[0032] In terms of sorting and collection efficiency, the discharge conduits 662 at different positions correspond to the impurities filtered out by different levels of filters. The top discharge conduit 662 receives the largest particle size impurities intercepted by the first filter 62 and guides them to the rear collection point. The middle conduit processes the medium-sized particle size impurities of the second filter 63 to the middle area. The bottom conduit discharges the smaller particle size impurities of the third filter 64 to the front. This clear distinction in spatial position allows operators to place collection containers directly at the corresponding positions, enabling rapid sorting and collection of impurities. This greatly improves the convenience and efficiency of impurity collection. In addition, this arrangement precisely corresponds to the position of the inclined guide groove 664 on the inclined guide plate 663, ensuring that impurities of different sizes are discharged in an orderly manner along the predetermined path, completely solving the problem of different impurities converging and mixing in the prior art.

[0033] As can be seen, in terms of screening and collection, the multi-layer inclined filter screen combined with the vibrating motor 7 extends the screening time of alumina powder and improves the screening accuracy. The material guiding system composed of the unqualified filter guide frame 661, the discharge guide pipe 662 and the inclined guide plate 663 realizes the separate guidance and classification collection of impurities of different particle sizes, avoids impurity aggregation, and greatly simplifies the subsequent processing process. In terms of environmental protection and energy saving, the dust removal mechanism 8 effectively prevents the escape of fine powder, reduces raw material waste, lowers production costs, and avoids dust pollution in the workshop. During the application of this equipment, the dust removal mechanism 8 removes extremely fine alumina powder. Normal qualified alumina powder will not be absorbed by the negative pressure of the suction hopper 835.

[0034] In this technical solution, the specific parameters of the main components, the model specifications of electronic components, and the power supply method need to be specified as follows: The base 1 and the bracket 2 are made of Q235B steel. The dimensions of the base 1 are 1500mm (length) × 1000mm (width) × 500mm (height), and the bracket 2 is 1000mm high. The outer shell 3 is welded from 8mm thick 304 stainless steel plate. The dimensions of the three filter discharge troughs 4 are 400mm (length) and 120mm (width), and the dimensions of the discharge trough 5 are 500mm (length) and 180mm (width). The tilt angle of the first filter screen 62, the second filter screen 63, and the third filter screen 64 is 22°, and the filter screen apertures are 0.6mm, 0.3mm, and 0.15mm, respectively. The frame 61 is sized to fit the internal space of the outer shell 3, and the tilt angle of the discharge guide plate 67 is... The filters are consistent; the vibration motor 7 is a YZU-15-6 type, with a power of 2.2kW, and is powered by three-phase 380V AC; the suction fan 82 is a 4-72NO.3.2A type, with a power of 1.1kW, and is powered by single-phase 220V; the filter screen 831 in the dust collector 81 has a mesh size of 250 mesh, and the suction hopper 835 has a diameter of 120mm. The controller of this device is a Siemens S7-200SMARTCPUST20, which is installed in the IP54 protection level control cabinet on the side of the base 1. It is connected to the vibration motor 7 and the suction fan 82 through RVV cables. The controller is powered by AC220V through a circuit breaker and outputs 24V DC to control the relay module to realize the start and stop of the equipment and the adjustment of the vibration frequency.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-layer sieving device for alumina powder, characterized in that: Includes a base (1), a bracket (2) fixedly installed on the top of the base (1), a shell (3) fixedly installed on the top of the bracket (2), three filter discharge slots (4) are opened on the front of the shell (3), a discharge slot (5) is opened at the lower back of the shell (3), a screening mechanism (6) is movably connected inside the shell (3), a vibration motor (7) is fixedly installed at the bottom of the shell (3), the vibration end of the vibration motor (7) is connected to the bottom of the screening mechanism (6), a dust removal mechanism (8) is fixedly installed on one side of the top of the shell (3), and a feed hopper (9) is fixedly connected on the side of the top of the shell (3) away from the dust removal mechanism (8); The screening mechanism (6) includes a frame (61), which is fixedly installed on the top vibration end of the vibration motor (7). The first filter screen (62), the second filter screen (63) and the third filter screen (64) are fixedly installed in a linear arrangement with equal spacing inside the frame (61). The output ends of the first filter screen (62), the second filter screen (63) and the third filter screen (64) all extend to the outside of the outer shell (3) through the filter discharge trough (4). The discharge guide plate (67) is fixedly installed at the bottom of the first filter screen (62), the second filter screen (63) and the third filter screen (64) inside the frame (61).

2. The multi-layer sieving device for alumina powder according to claim 1, characterized in that: The screening mechanism (6) further includes a material guiding group (66), which includes a non-conforming filter guide frame (661). The non-conforming filter guide frame (661) is fixedly installed on the downward-sloping output ends of the first filter screen (62), the second filter screen (63), and the third filter screen (64). The output ends of the non-conforming filter guide frame (661) are all fixedly connected to discharge conduits (662). Among the three discharge conduits (662), the output end of the top discharge conduit (662) is located on the rear side, the output end of the middle discharge conduit (662) is located in the middle, and the output end of the bottom discharge conduit (662) is located on the front side.

3. The multi-layer sieving device for alumina powder according to claim 2, characterized in that: The material guiding assembly (66) also includes an inclined guide plate (663), which is installed at an angle on the lower end of the outer shell (3) near the filter discharge trough (4). The top of the inclined guide plate (663) is provided with inclined guide grooves (664) arranged linearly at equal intervals. The top input ends of the three inclined guide grooves (664) correspond to the output ends of the three discharge conduits (662).

4. The multi-layer sieving device for alumina powder according to claim 1, characterized in that: The dust removal mechanism (8) includes a dust removal box (81), which is fixedly installed on the top side of the outer shell (3). A suction fan (82) is fixedly installed on the top of the dust removal box (81). The input end of the suction fan (82) is connected to the inside of the dust removal box (81). A filter assembly (83) is slidably connected inside the dust removal box (81).

5. The multi-layer sieving device for alumina powder according to claim 4, characterized in that: The filter assembly (83) includes a filter screen box (831), which is slidably connected to the inside of the dust collector box (81). A sealing door (832) is fixedly installed on the outside of the filter screen box (831), and the sealing door (832) covers the outlet of the dust collector box (81).

6. The multi-layer sieving device for alumina powder according to claim 5, characterized in that: A fixing arm (833) is fixedly installed on the middle of the rear side of the sealing door (832), and a fixing screw (834) is threaded to the outer end of the fixing arm (833). A suction hopper (835) is fixedly connected to the top of the outer shell (3).

7. The multi-layer sieving device for alumina powder according to claim 6, characterized in that: A limiting hole (836) is provided on the back side of the dust collector (81) near the fixing arm (833), and the end of the fixing screw (834) is inserted into the limiting hole (836).

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