A feeding and conveying device for gas-solid phase fine separation and classification of light powders

Abstract

This invention belongs to the field of dust-free feeding, specifically relating to a feeding and conveying device for the fine separation of gas-solid phases of lightweight powders. It includes a feeding assembly, a diaphragm pump, and a mixer. The feeding assembly includes a feeding box, the top of which is connected to a negative pressure fan, and the bottom of which is connected to a feed box. The mixer includes a base with a material hopper mounted on it. The top of the material hopper is detachably connected to and connected to a top cover hopper. A feed pipe and an exhaust pipe are fixedly connected to and connected to the outer wall of the top cover hopper. The exhaust pipe, located away from the top cover hopper, is fixedly connected to and connected to one end of an exhaust box, and the other end of the exhaust box is connected to an exhaust fan. This device achieves dust-free feeding, preventing the spillage of lightweight powders, and also performs sedimentation treatment on the gas-solid mixed lightweight powders fed into the top cover hopper of the mixer, improving the raw material utilization rate for subsequent mixing. Furthermore, it is adaptable to various models of mixers, exhibiting high versatility.

Description

Technical Field

[0001] This invention belongs to the field of dust-free feeding, specifically relating to a feeding and conveying device for fine gas-solid phase separation of lightweight powders. Background Technology

[0002] In industries such as chemical, food, pharmaceutical, and new material preparation, the feeding of lightweight powders, such as ultrafine calcium carbonate, talc, pigment powder, and pharmaceutical excipients, is a crucial preliminary step in the mixing process. Traditionally, lightweight powders are fed into mixers either manually unpacked and poured or mechanically via a screw conveyor. The powders enter the mixer's hopper through the feeding port, and then the mixing blades are activated for mixing and dispersion. This feeding process results in significant dust spillage, polluting the environment and posing health risks. Due to the light weight and high airborne properties of lightweight powders, a large amount of dust escapes from the mixer's feeding port into the workshop air at the moment of feeding, not only creating a harsh working environment and increasing the risk of dust explosions, but also posing a continuous threat to the respiratory health of operators.

[0003] Chinese invention patent application CN202610175287.4 discloses a dust-free feeding device for bagged catalyst powder, including a catalyst preparation tank and a catalyst hopper installed above it, as well as a dust removal negative pressure component connected to the exhaust port of the catalyst preparation tank. A catalyst feeding fixture is installed above the catalyst hopper. The catalyst feeding fixture includes a frame and a sealed chamber mounted on the frame, a bag-breaking conveying component, a bag-shaking mechanism, a pressing component, and a vibrating screen. The bag-breaking conveying component penetrates the sealed chamber and is used for bag conveying and bag breaking. The bag-shaking mechanism and the pressing component are both located above the sealed chamber and extend into the chamber. The vibrating screen is located inside the catalyst hopper and is drive-connected to the bag-breaking conveying component. This invention, by setting up a dust removal negative pressure component connected to the catalyst preparation tank, creates a negative pressure environment, effectively absorbing and filtering dust generated during the feeding process, preventing dust diffusion, and ensuring the health of operators and a clean production environment.

[0004] However, when lightweight powders are added to the mixer, their small particle size and low specific gravity make them prone to dispersion and dust pollution during feeding and conveying. This not only pollutes the production environment but also poses a threat to the respiratory health of operators. When lightweight powders are fed into the mixing equipment, they tend to float in the upper cavity after mixing with gas, making it difficult for them to settle into the mixing tank, thus reducing raw material utilization. Existing feeding equipment is often integrated with a specific model of mixer, lacking independent modular design and making it difficult to adapt to different specifications of mixing equipment, resulting in poor versatility. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a feeding and conveying device for the fine separation of gas-solid phases of lightweight powders. Through the coordinated operation of the feeding assembly, diaphragm pump, and mixer, this invention achieves dust-free feeding, preventing the spillage of lightweight powder and reducing its impact on the environment and worker health. Furthermore, it performs sedimentation treatment on the gas-solid mixed lightweight powder fed into the upper cover of the mixer, preventing it from adsorbing and floating in the upper cover, thereby improving the utilization rate of raw materials for subsequent mixing. It is also adaptable to various types of mixers, exhibiting high versatility.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A feeding and conveying device for fine gas-solid phase separation of lightweight powders includes a feeding assembly, a diaphragm pump, and a mixer. The feeding assembly includes a feeding box, the top of which is connected to a negative pressure fan, and the bottom of which is connected to a feed box. The mixer includes a base with a material bucket mounted on it. The top of the material bucket is detachably connected to and connected to a top cover bucket. A feed pipe and an exhaust pipe are fixedly connected to and connected to the outer wall of the top cover bucket. The exhaust pipe, at one end away from the top cover bucket, is fixedly connected to and connected to one end of an exhaust box. The other end of the exhaust box is connected to an exhaust fan. A butterfly valve is installed at the connection between the exhaust box and the exhaust pipe, and the butterfly valve is configured to control the opening and closing of the inner cavity of the exhaust box and the inner cavity of the exhaust pipe. The inlet of the diaphragm pump is connected to one end of the feed box outlet via a pipeline, and the outlet of the diaphragm pump is connected to the inlet end of the feed pipe away from the top cover bucket via a pipeline.

[0007] Furthermore, the mixer includes a filter membrane, and multiple layers of the filter membrane are arranged side by side within the air extraction chamber.

[0008] Furthermore, the mixer includes a vacuum backflush pump and a vacuum dustproof membrane. The vacuum dustproof membrane is arranged inside the vacuum box cavity, and the vacuum backflush pump is fixedly connected to the outer wall of the vacuum box. The air outlet of the vacuum backflush pump extends into the inner cavity of the vacuum box and faces the top surface of the vacuum dustproof membrane.

[0009] Furthermore, the mixer includes uprights and a crossbeam. The bottoms of the two uprights are fixedly connected to the base, and the material bucket is located between the two uprights. The crossbeam is fixedly connected to the tops of the two uprights, and the upper cover bucket is located below the crossbeam.

[0010] Furthermore, the mixer includes a stirring motor and a main drive shaft. The stirring motor is fixedly connected to the crossbeam, and the main drive shaft is rotatably connected to the crossbeam and faces into the inner cavity of the upper cover bucket. The output shaft of the stirring motor is connected to the main drive shaft via a belt drive.

[0011] Furthermore, the mixer includes an industrial computer, which is fixedly connected to one side of the column, and the mixing motor and the butterfly valve are both electrically connected to the industrial computer.

[0012] Furthermore, the mixer includes a hydraulic station located next to the base.

[0013] Furthermore, the feeding assembly includes a feeding dustproof membrane, which is arranged in the upper part of the inner cavity of the feeding box.

[0014] Furthermore, the feeding assembly includes a feeding backflushing pump, which is fixedly connected to the outer wall of the feeding box, and the air outlet of the feeding backflushing pump extends into the inner cavity of the feeding box and faces the top surface of the feeding dustproof membrane.

[0015] Furthermore, the feeding assembly includes a support frame, which is fixedly connected to the bottom of the feeding box, and the feeding box is surrounded by the support frame.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) This invention can achieve dust-free feeding and prevent the spillage of light powder, thereby reducing the impact on the environment and workers' health. First, start the negative pressure fan of the feeding component. The negative pressure fan will draw the feeding box into negative pressure. Then, the operator will put the light powder to be fed into the mixer into the feeding box through the inlet. Because the feeding box is kept under negative pressure, it can effectively ensure that the fed light powder is sucked in and will not drift to the outside. The fed light powder gathers in the feeding box at the bottom of the feeding component. At the same time, the top of the feeding component is equipped with a feeding dustproof membrane and a feeding back-flushing pump. When the negative pressure fan creates a negative pressure environment, some light powder will float upwards. This light powder is blocked by the feeding dustproof membrane to prevent it from entering the negative pressure fan and causing blockage. While the feeding dustproof membrane retains the light powder, the feeding back-blowing pump is used to periodically back-blow the feeding dustproof membrane, blowing the light powder on the feeding dustproof membrane back to the bottom feed box. The light powder accumulated in the feed box is pumped into the upper cover bucket of the mixer by an external diaphragm pump, thereby achieving dust-free feeding, reducing environmental pollution and minimizing the impact on workers' health.

[0017] (2) This invention can perform sedimentation treatment on the gas-solid mixed light powder in the upper cover bucket of the mixer, avoiding adsorption and floating in the upper cover bucket, thereby improving the raw material utilization rate of subsequent mixing. Because the light powder is injected into the upper cover bucket along with the air, due to negative pressure adsorption and partial static electricity, the gas-powder mixture is easy to float in the upper cavity of the upper cover bucket and difficult to fall into the material bucket, affecting the subsequent mixing operation. At this time, the butterfly valve is opened, and the air extraction box is connected to the inner cavity of the upper cover bucket through the air extraction pipe. The air extraction fan is started, and the air that enters the inner cavity of the upper cover bucket along with the light powder is extracted. During the air extraction process, some of the light powder is blocked by the filter membrane arranged in the air extraction pipe and remains in the cavity, thereby realizing the fine separation of the gas and solid phases of the light powder. After the air extraction of the inner cavity of the upper cover bucket is completed, the floating light powder will fall into the lower material bucket by gravity, so as to carry out the subsequent mixing operation and improve the raw material utilization rate of the mixing operation.

[0018] (3) The present invention can be adapted to various types of mixers and has high versatility. The dust-free feeding system is designed as an independent module. When feeding different types of mixers, it is only necessary to change the pipe size that connects the diaphragm pump outlet to the mixer. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a feeding and conveying device for fine gas-solid separation of lightweight powders according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of a feeding and conveying device for fine gas-solid separation of lightweight powders according to the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the overall structure of a feeding and conveying device for fine gas-solid separation of lightweight powders according to the present invention. Figure 3 ; Figure 4 This is a partial cross-sectional schematic diagram of a feeding and conveying device for fine gas-solid separation of lightweight powders according to the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the feeding component structure of a feeding and conveying device for fine gas-solid phase separation of lightweight powders according to the present invention. Figure 6 This is a partial cross-sectional schematic diagram of a feeding and conveying device for fine gas-solid separation of lightweight powders according to the present invention. Figure 2 .

[0020] The attached figures are labeled as follows: 100. Feeding assembly; 101. Feeding box; 102. Negative pressure fan; 103. Feeding hopper; 104. Support frame; 105. Feeding backflushing pump; 106. Feeding dustproof membrane; 200. Diaphragm pump; 300. Mixer; 301. Base; 302. Material bucket; 303. Top cover bucket; 304. Crossbeam; 305. Feed pipe; 306. Vacuum box; 307. Exhaust fan; 308. Butterfly valve; 309. Exhaust pipe; 310. Hydraulic station; 311. Column; 312. Industrial computer; 313. Mixing motor; 314. Exhaust backflush pump; 315. Main drive shaft; 316. Filter diaphragm; 317. Exhaust dustproof membrane. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] Although the steps in this invention are arranged with reference numerals, this is not intended to limit the order of the steps. Unless the order of the steps is explicitly stated or the execution of a step requires other steps as a basis, the relative order of the steps can be adjusted. It is understood that the term "and / or" as used herein refers to and covers any and all possible combinations of one or more of the associated listed items.

[0023] Example like Figures 1-6 As shown, a feeding and conveying device for gas-solid phase fine separation of lightweight powders includes a feeding assembly 100, a diaphragm pump 200 and a mixer 300. The feeding assembly includes a feeding box 101, the top of which is connected to a negative pressure fan 102 and the bottom of which is connected to a feed box 103. The mixer 300 includes a base 301, on which a material hopper 302 is mounted. The top of the material hopper 302 is detachably connected to and communicates with an upper cover hopper 303. An inlet pipe 305 and an exhaust pipe 309 are fixedly connected to and communicate with the outer wall of the upper cover hopper 303. One end of the exhaust pipe 309, away from the upper cover hopper 303, is fixedly connected to and communicates with one end of an exhaust box 306. The other end of the exhaust box 306 is connected to an exhaust fan 307. A butterfly valve 308 is installed at the connection between the exhaust box 306 and the exhaust pipe 309. The butterfly valve 308 is configured to control the opening and closing of the inner cavity of the exhaust box 306 and the inner cavity of the exhaust pipe 309. The inlet of the diaphragm pump 200 is connected to one end of the outlet of the feed box 103 via a pipeline, and the outlet of the diaphragm pump 200 is connected to the inlet end of the feed pipe 305 away from the upper cover hopper 303 via a pipeline.

[0024] Furthermore, the feeding assembly 100 includes a feeding backflushing pump 105, which is fixedly connected to the outer wall of the feeding box 101. The air outlet of the feeding backflushing pump 105 extends into the inner cavity of the feeding box 101 and faces the top surface of the feeding dustproof membrane 106.

[0025] In this invention, dust-free feeding can be achieved, preventing the spillage of lightweight powder and reducing the impact on the environment and worker health. First, the negative pressure fan 102 of the feeding assembly 100 is started. The negative pressure fan 102 draws negative pressure into the feeding box 101. The operator then feeds the lightweight powder to be added to the mixer 300 through the inlet of the feeding box 101. Because the feeding box 101 maintains negative pressure, it effectively ensures that the added lightweight powder is sucked in and does not drift to the outside. The added lightweight powder gathers in the feed box 103 at the bottom of the feeding assembly 100. Simultaneously, a dustproof feeding membrane 106 and a feeding back-flushing pump 105 are provided at the top of the feeding assembly 100. When the negative pressure fan 102 creates a negative pressure environment by drawing in air, some light powder will float upwards. This part of the light powder is blocked by the feeding dustproof membrane 106 to prevent it from entering the negative pressure fan 102 and causing blockage. While the feeding dustproof membrane 106 retains the light powder, the feeding back-blowing pump 105 periodically back-blowing the feeding dustproof membrane 106 will blow the light powder on the feeding dustproof membrane 106 back into the bottom feed box 103. The light powder accumulated in the feed box 103 is pumped into the upper cover bucket 303 of the mixer 300 by the external diaphragm pump 200, thereby achieving dust-free feeding, reducing environmental pollution and reducing the impact on workers' health.

[0026] It is worth noting that the feeding assembly 100 and the diaphragm pump 200 constitute an independent feeding and conveying module. When it is necessary to adapt to different models of mixers, only the size of the connecting pipe between the outlet of the diaphragm pump 200 and the feed pipe 305 of the mixer 300 needs to be changed. No modifications are required to the feeding assembly 100 and the diaphragm pump 200 themselves, which has good versatility and scalability.

[0027] Furthermore, the mixer 300 includes a filter membrane 316, which is arranged in multiple layers side by side within the cavity of the exhaust pipe 309.

[0028] In this invention, the gas-solid mixed light powder in the upper cover barrel 303 of the mixer 300 can be subjected to sedimentation treatment to avoid adsorption and floating in the upper cover barrel 303, thereby improving the raw material utilization rate of subsequent mixing. Because the light powder is injected into the upper cover barrel 303 along with air, due to negative pressure adsorption and partial static electricity, the gas-powder mixture is easy to float in the upper cavity of the upper cover barrel 303 and is difficult to fall into the material barrel 302, which affects the subsequent mixing operation. At this time, the butterfly valve 308 is opened, and the air extraction box 306 is connected to the inner cavity of the upper cover barrel 303 through the air extraction pipe 309. The air extraction fan 307 is started, and the air that entered the inner cavity of the upper cover barrel 303 along with the light powder is extracted. During the air extraction process, some of the light powder is blocked by the filter membrane 316 arranged in the air extraction pipe 309 and remains in the cavity, thereby realizing the fine gas-solid phase separation of the light powder. After the air extraction of the inner cavity of the upper cover barrel 303 is completed, the floating light powder will fall into the lower material barrel 302 by gravity, so as to carry out subsequent mixing operations and improve the raw material utilization rate of the mixing operation.

[0029] Furthermore, the mixer 300 includes a vacuum backflush pump 314 and a vacuum dustproof membrane 317. The vacuum dustproof membrane 317 is arranged inside the vacuum box 306 cavity. The vacuum backflush pump 314 is fixedly connected to the outer wall of the vacuum box 306. The air outlet of the vacuum backflush pump 314 extends into the inner cavity of the vacuum box 306 and faces the top surface of the vacuum dustproof membrane 317.

[0030] In this invention, the upper part of the inner cavity of the air extraction box 306 is provided with an air extraction backflush pump 314 and an air extraction dustproof membrane 317. When the air extraction fan 307 extracts the air from the upper cover bucket 303, some light powder will be sucked into the air extraction box 306. This part of light powder is blocked by the air extraction dustproof membrane 317 to prevent it from entering the air extraction fan 307 and causing blockage. While the light powder is blocked by the air extraction dustproof membrane 317, the air extraction backflush pump 314 is used to periodically backflush the air extraction dustproof membrane 317, and blow a small amount of light powder on the air extraction dustproof membrane 317 back into the air extraction pipe 309.

[0031] Preferably, the filter membrane 316 is made of stainless steel sintered mesh or PTFE membrane filter material, which can withstand the airflow impact and friction during the extraction process. The feeding dustproof membrane 106 and the extraction dustproof membrane 317 are made of PTFE membrane filter material or polyester fiber nonwoven fabric.

[0032] Furthermore, the mixer 300 includes uprights 311 and a crossbeam 304. The bottoms of the two uprights 311 are fixedly connected to the base 301, and the material bucket 302 is located between the two uprights 311. The crossbeam 304 is fixedly connected to the tops of the two uprights 311, and the upper cover bucket 303 is located below the crossbeam 304.

[0033] In this invention, two uprights 311 are fixedly connected to the base 301 at their bottoms, and a material bucket 302 is located between the two uprights 311. A crossbeam 304 is fixedly connected to the tops of the two uprights 311, and an upper cover bucket 303 is located below the crossbeam 304. Both the uprights 311 and the crossbeam 304 are made of rectangular hollow steel, possessing sufficient structural strength and rigidity.

[0034] Furthermore, the mixer 300 includes a mixing motor 313 and a main drive shaft 315. The mixing motor 313 is fixedly connected to the crossbeam 304, and the main drive shaft 315 is rotatably connected to the crossbeam 304 and faces into the inner cavity of the upper cover barrel 303. The output shaft of the mixing motor 313 is connected to the main drive shaft 315 via belt drive.

[0035] In this invention, the lower end of the main drive shaft 315 can be connected to stirring blades of different sizes and materials according to stirring requirements. The stirring blades are housed in the material tank 302. The type of stirring blades can be selected according to the characteristics of the powder, including but not limited to anchor blades, spiral belt blades, turbine blades or dispersing disc blades. An organic seal assembly is provided at the penetration point between the main drive shaft 315 and the upper cover tank 303 to ensure the reliability of the seal during stirring.

[0036] Furthermore, the mixer 300 includes an industrial control computer 312, which is fixedly connected to the side of one of the columns 311. The mixing motor 313 and the butterfly valve 308 are both electrically connected to the industrial control computer 312.

[0037] Preferably, the industrial computer 312 is an embedded fanless industrial computer, equipped with an Intel Celeron J6412 processor with a main frequency of 2.0GHz, 8GB DDR4 memory, and 128GB industrial-grade SSD storage. This model features a fanless design, IP40 protection rating, and supports a wide voltage DC power supply of 9V to 36V, fully meeting the requirements of this device for the coordinated automated control of the feeding component 100, diaphragm pump 200, and mixer 300. This selection balances cost, performance, and reliability, and is particularly suitable for industrial sites where lightweight powder feeding and conveying operations are carried out.

[0038] In this invention, both the stirring motor 313 and the butterfly valve 308 are electrically connected to the industrial control computer 312. When the stirring motor 313 starts working, it sends an electrical signal to the industrial control computer 312. Upon receiving the signal that the stirring motor 313 has started, the industrial control computer 312 sends a closing signal to the butterfly valve 308. Upon receiving the signal, the butterfly valve 308 closes, so that when the mixer 100 is performing stirring operations, the inner cavity formed by the material bucket 302 and the upper cover bucket 303 is completely isolated from the outside world to form a closed stirring working chamber.

[0039] Furthermore, the mixer 300 includes a hydraulic station 310, which is located next to the base 301.

[0040] In this invention, the hydraulic station 310 is placed next to the base 301 to provide hydraulic power for the lifting and lowering of the upper cover 303 relative to the material bucket 302, which facilitates the loading, unloading and cleaning of the material bucket 302.

[0041] Furthermore, the feeding assembly 100 includes a feeding dustproof membrane 106, which is arranged in the upper part of the inner cavity of the feeding box 101.

[0042] Furthermore, the feeding assembly 100 includes a support frame 104, which is fixedly connected to the bottom of the feeding box 101, and the feeding box 103 is surrounded by the support frame 104.

[0043] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A feeding and conveying device for fine gas-solid separation of lightweight powders, characterized in that, It includes a feeding assembly (100), a diaphragm pump (200) and a mixer (300). The feeding assembly includes a feeding box (101), the top of which is connected to a negative pressure fan (102), and the bottom of which is connected to a feed box (103). The mixer (300) includes a base (301), on which a material bucket (302) is provided. The top of the material bucket (302) is detachably connected to and communicates with an upper cover bucket (303). The outer wall of the upper cover bucket (303) is fixedly connected to and communicates with a feed pipe (305) and an exhaust pipe (309). The end of the exhaust pipe (309) away from the upper cover bucket (303) is fixedly connected to and communicates with one end of an exhaust box (306). The other end of the exhaust box (306) is communicated with an exhaust fan (307). A butterfly valve (308) is installed at the connection between the exhaust box (306) and the exhaust pipe (309). The butterfly valve (308) is configured to control the opening and closing of the inner cavity of the exhaust box (306) and the inner cavity of the exhaust pipe (309). The inlet of the diaphragm pump (200) is connected to the outlet of the feed box (103) through a pipeline, and the outlet of the diaphragm pump (200) is connected to the inlet of the feed pipe (305) away from the top cover barrel (303) through a pipeline.

2. The feeding and conveying device for gas-solid phase fine separation of lightweight powders according to claim 1, characterized in that, The mixer (300) includes a filter diaphragm (316), which is arranged in multiple layers side by side in the cavity of the air extraction pipe (309).

3. The feeding and conveying device for gas-solid phase fine separation of lightweight powders according to claim 1, characterized in that, The mixer (300) includes a vacuum backflush pump (314) and a vacuum dustproof membrane (317). The vacuum dustproof membrane (317) is arranged inside the vacuum box (306). The vacuum backflush pump (314) is fixedly connected to the outer wall of the vacuum box (306). The outlet of the vacuum backflush pump (314) extends into the inner cavity of the vacuum box (306) and faces the top surface of the vacuum dustproof membrane (317).

4. The feeding and conveying device for gas-solid phase fine separation of lightweight powders according to claim 1, characterized in that, The mixer (300) includes columns (311) and crossbeams (304). The bottoms of the two columns (311) are fixedly connected to the base (301), and the hopper (302) is located between the two columns (311). The crossbeam (304) is fixedly connected to the top of the two columns (311), and the top cover (303) is located below the crossbeam (304).

5. The feeding and conveying device for gas-solid phase fine separation of lightweight powders according to claim 4, characterized in that, The mixer (300) includes a stirring motor (313) and a main drive shaft (315). The stirring motor (313) is fixedly connected to the crossbeam (304), and the main drive shaft (315) is rotatably connected to the crossbeam (304) and faces the inner cavity of the upper cover barrel (303). The output shaft of the stirring motor (313) is connected to the main drive shaft (315) by belt drive.

6. The feeding and conveying device for gas-solid phase fine separation of lightweight powders according to claim 5, characterized in that, The mixer (300) includes an industrial computer (312), which is fixedly connected to the side of one of the columns (311). The mixing motor (313) and the butterfly valve (308) are both electrically connected to the industrial computer (312).

7. The feeding and conveying device for gas-solid phase fine separation of lightweight powders according to claim 1, characterized in that, The mixer (300) includes a hydraulic station (310) located next to the base (301).

8. The feeding and conveying device for gas-solid phase fine separation of lightweight powders according to claim 1, characterized in that, The feeding assembly (100) includes a feeding dustproof membrane (106), which is arranged in the upper part of the inner cavity of the feeding box (101).

9. The feeding and conveying device for gas-solid phase fine separation of lightweight powders according to claim 8, characterized in that, The feeding assembly (100) includes a feeding backflushing pump (105), which is fixedly connected to the outer wall of the feeding box (101). The air outlet of the feeding backflushing pump (105) extends into the inner cavity of the feeding box (101) and faces the top surface of the feeding dustproof membrane (106).

10. The feeding and conveying device for gas-solid phase fine separation of lightweight powders according to claim 1, characterized in that, The feeding assembly (100) includes a support frame (104), which is fixedly connected to the bottom of the feeding box (101), and the feeding box (103) is surrounded by the support frame (104).

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