A multi-linked grain dust collector

Abstract

The invention discloses a multi-linked grain dust collector, including a vehicle-mounted platform, a vibrating screen, a wind selection box, a sedimentation box, a dust removal box and a conveyor belt; in the invention, grains enter the vibrating screen through a feed hopper, larger impurities are discharged through a large impurity discharge pipe, heavier impurities are discharged from a heavy impurity discharge pipe, lighter impurities are discharged through a light impurity discharge pipe, and the remaining dust is filtered and precipitated in the dust removal box and then discharged through a dust discharge hopper, thereby completing the screening and impurity removal of grains. Through a fully enclosed multi-linked dust removal structure, the impurity content in grains can be reduced from 10% to 0.5%, meeting the processing standard, while protecting the working environment, avoiding dust pollution and fire hazards; in addition, a plurality of filter bags are arranged in the dust removal box, and high-pressure gas blowing holes of the blowing pipe are blown back to the inside of the filter bags for efficient dust cleaning, thereby improving the dust cleaning efficiency.

Description

Technical Field

[0001] The invention relates to the field of grain dust removal and storage, and in particular to a multi-linked grain dust remover. Background Art

[0002] In the process of grain collection, transportation, processing, storage, etc., various impurities are often mixed in. Inorganic impurities in grain include dust, sand, mud, stone, bricks, rubble and metal objects; organic impurities include plant roots, stems, leaves, shells, weeds, etc. These impurities are very harmful to grain processing and storage. Therefore, impurities need to be removed before grain is stored in the warehouse to ensure that the grain quality meets the national food safety quality standards. This is not only conducive to grain storage, but also provides raw materials that meet the index requirements for subsequent production and processing. In grain reserves, the convenience, efficiency and environmental protection of storage equipment are receiving more and more attention, and grain dust collectors have become important pre-treatment equipment before grain is stored.

[0003] At present, the grain in and out of the warehouse generally adopts mobile conveyors and mobile cleaning screens to deal with grain impurities. The impurity removal process mostly requires vibration, screening, transmission and other operations. Due to the open operation, the entire warehouse entry site is full of flying dust and light impurities, causing serious dust in the working environment, polluting the environment and causing harm to the respiratory health of operators. It has a great impact on the surrounding environment and also buries serious fire hazards. In addition, the dust cleaning structure of the existing dust collector equipment is unreasonable. Direct air blowing does not clean the flat cloth cylinder thoroughly, and a lot of dust accumulates, affecting the dust removal and filtration effect. The high-pressure air cleaning filter cartridge shakes unevenly and cannot be cleaned quickly and effectively. The water and oil contained in the high-pressure air after air compression are directly blown into the filter cartridge, which will damage the equipment and affect the dust removal and filtration effect and equipment life. The market urgently needs an efficient and safe grain dust collector that combines the functions of fine grain screening, impurity removal and dust removal. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a multi-linked grain dust collector.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: The invention discloses a multi-linked grain dust collector, comprising a vehicle-mounted platform and a vibrating screen installed on the vehicle-mounted platform and arranged obliquely, wherein the vibrating screen is used to filter larger impurities in the grain; a wind separation box is connected to the lower end of the vibrating screen to extract and filter lighter light impurities in the grain; a sedimentation box is connected to one side of the wind separation box for settling light impurities; a dust removal box is connected to one side of the sedimentation box through a pipeline; dust removal fans are connected to the outer ends of the dust removal box through air ducts on both sides for exhausting air and filtering the air entering the dust removal box; a conveyor belt for conveying grain is also installed at the bottom of the wind separation box; a multi-layer screen mesh structure is provided inside the vibrating screen to screen and remove impurities from the grain, large impurity discharge pipes are provided on both sides of the vibrating screen, and the larger impurities filtered out by the vibrating screen are discharged through the large impurity discharge pipes, and heavy impurity discharge pipes are provided on both sides of the lower end of the vibrating screen, which are connected to the dust removal box through air ducts. The heavier impurities filtered out by the vibration screen are discharged through the heavy impurity discharge pipe, and the middle part of the lower end of the vibration screen is connected to the air separation box through the first grain discharge hopper; the air separation box is connected to the first grain discharge hopper through a vertical air duct to filter the grain again, and a second grain discharge hopper is provided at the bottom of the air separation box, and the grain that has been filtered again falls onto the conveyor belt through the second grain discharge hopper, and a wind separator is provided on the top of the air separation box for collecting lighter lightweight impurities in the grain; a light impurity conveying pipe for collecting lightweight impurities is provided below the sedimentation box; a partition is fixed on the inner side of the dust removal box, and filter bags are evenly fixed on the partition, an air pipe nozzle is provided inside the dust removal box and above the filter bag, and a dust discharge hopper for collecting dust is fixed at the bottom of the dust removal box; an exhaust box is installed on the top of the two dust removal fans to discharge the gas purified by the dust removal box.

[0006] As a preferred technical solution of the present invention, the front roller and the rear roller are connected to the left and right lower corners of the vehicle-mounted platform through a bracket, the front roller is connected to the steering wheel through a rotating shaft, and the rear roller is connected to a power supply through a driving motor for driving the vehicle-mounted platform to move. A number of positioning piles for fixing the vehicle-mounted platform are also provided on both sides of the vehicle-mounted platform.

[0007] As a preferred technical solution of the present invention, vibration motors are fixedly installed at the middle positions on both sides of the vibration screen, a control box is fixedly installed on one side of the vehicle-mounted platform, the control box is electrically connected to the power supply, and the two vibration motors are electrically connected to the control box. A multi-layer screen is provided inside the vibration screen for screening large impurities of different sizes in the grain, and a feed hopper is connected to the top of the vibration screen for receiving the grain to be cleaned.

[0008] As a preferred technical solution of the present invention, the bottom of the light impurity conveying pipe is connected to a light impurity discharge pipe for collecting light impurities, and a propulsion auger is installed in the light impurity discharge pipe for pushing the light impurities to one side of the vehicle-mounted platform for discharge.

[0009] As a preferred technical solution of the present invention, the air pipe nozzle is connected to a compressed air bag through a gas pipeline, and an electromagnetic pulse valve is arranged in the middle of the gas pipeline for controlling the air pipe nozzle to provide a pulsed vibrating airflow to the filter bag, thereby impacting and vibrating the dust left by the filter on the outer surface of the filter bag.

[0010] As a preferred technical solution of the present invention, the interior of the dust removal box is divided into a filter chamber and an air intake chamber by the partition, the filter chamber and the air intake chamber are connected through the filter bag, and the outer ends of the air intake chamber are connected to the dust removal fan through air ducts to suck away the air and form negative pressure.

[0011] As a preferred technical solution of the present invention, the two dust removal fans are respectively connected to dust removal motors for driving the dust removal fans to rotate through rotating shafts, and the base of the dust removal motor is fixed above the vehicle-mounted platform.

[0012] As a preferred technical solution of the present invention, the conveyor belt is fixed to the lower part of the vehicle-mounted platform, the conveyor belt is driven by a transmission motor, and the transmission motor is electrically connected to the power supply to transport the filtered and impurity-free grain to an external storage box.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. Grain enters the vibrating screen through the feed hopper, and the larger impurities filtered out are discharged through the large impurities discharge pipe, and the heavier impurities filtered out are discharged from the heavy impurities discharge pipe, and the lighter impurities in the grain are sucked out by the air separation box, and the clean grain is sent out through the conveyor belt. The lighter impurities continue to settle in the sedimentation box and are discharged through the light impurities discharge pipe. The remaining dust is sucked into the dust removal box by the dust removal motor for filtration and sedimentation, and then discharged through the dust discharge hopper, thus completing the screening, impurity removal and dust removal of grain. Through the multi-linked vibration screening structure, the impurity content in grain can be reduced from 10% to 0.5%, meeting the processing standard requirements. At the same time, through the fully enclosed dust removal linkage structure, the working environment is protected and dust pollution and fire hazards are avoided; 2. A closed passage is formed in the filter chamber and the suction chamber, which is separated by a filter bag. An air pipe nozzle is set on the filter bag. The compressed air bag directly provides high-pressure gas, and the high-pressure pulse airflow is formed by the control of the electromagnetic pulse valve and blown into the filter bag. At the moment of high-speed airflow injection, each filter bag can get the same expansion and shaking effect. The injection airflow has high pressure and stable pulse, which is easy to control, thus avoiding the phenomenon of large expansion and shaking amplitude in the middle and small expansion and shaking amplitude on both sides, resulting in uneven cleaning effect, avoiding filter hole blockage and improving filtering and cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a front view of the present invention; Figure 3 is a top view of the present invention; Figure 4 It is a left side view of the present invention; Figure 5 It is a right side view of the present invention; Figure 6 It is a cross-sectional structural schematic diagram of the present invention; In the figure: 1. Vehicle-mounted platform; 2. Vibrating screen; 3. Air separation box; 4. Sedimentation box; 5. Dust removal box; 6. Dust removal fan; 7. Conveyor belt; 11. Front roller; 12. Rear roller; 13. Steering wheel; 14. Power supply; 15. Positioning pile; 16. Control box; 21. Large impurities discharge pipe; 22. Heavy impurities discharge pipe; 23. First grain hopper; 24. Vibrating motor; 25. Feed hopper; 31. Second grain hopper; 32. Air separator; 41. Light impurities conveying pipe; 42. Light impurities discharge pipe; 51. Partition; 52. Filter bag; 53. Air pipe nozzle; 54. Dust discharge hopper; 55. Compressed air bag; 56. Solenoid pulse valve; 57. Filter chamber; 58. Suction chamber; 61. Exhaust box; 62. Dust removal motor; 71. Conveying motor. DETAILED DESCRIPTION

[0015] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0016] In the drawings, the same reference numerals all refer to the same components.

[0017] like Figure 1-6 As shown, the present invention provides a multi-linked grain dust collector, comprising a vehicle-mounted platform 1 and a vibrating screen 2 obliquely mounted on the vehicle-mounted platform 1, wherein the vibrating screen 2 is used to filter larger impurities in grains; The lower end of the vibrating screen 2 is connected to a wind separation box 3, which is used to extract and filter the lighter impurities in the grain; A sedimentation box 4 for settling light impurities is connected to one side of the winnowing box 3; One side of the sedimentation box 4 is connected to a dust removal box 5 through a pipeline; Dust removal fans 6 are connected to both sides of the outer end of the dust removal box 5 through air ducts for extracting air and filtering the air entering the dust removal box 5; A conveyor belt 7 for conveying grain is also installed at the bottom of the winnowing box 3; A multi-layer mesh structure is provided inside the vibrating screen 2 to screen and remove impurities from the grains. Large impurity discharge pipes 21 are provided on both sides of the vibrating screen 2. Large impurities filtered out by the vibrating screen 2 are discharged through the large impurity discharge pipes 21. Heavy impurity discharge pipes 22 are provided on both sides of the lower end of the vibrating screen 2. Heavy impurities filtered out by the vibrating screen 2 are discharged through the heavy impurity discharge pipes 22. A first grain discharge hopper 23 is provided in the middle of the lower end of the vibrating screen 2 and is connected to the air separation box 3. The air separation box 3 is connected to the first grain outlet hopper 23 through a vertical air duct to screen the grain again. A second grain outlet hopper 31 is provided at the bottom of the air separation box 3. The grain that has been filtered again falls onto the conveyor belt 7 through the second grain outlet hopper 31. A wind separator 32 is provided at the top of the air separation box 3 to collect lighter impurities in the grain. A light impurity conveying pipe 41 for collecting light impurities is provided below the sedimentation box 4. A partition 51 is fixed inside the dust removal box 5, and filter bags 52 are evenly fixed on the partition 51. An air pipe nozzle 53 is provided inside the dust removal box 5 and above the filter bags 52. A dust discharge hopper 54 for collecting dust is fixed at the bottom of the dust removal box 5. An exhaust box 61 is installed on the top of the two dust removal fans 6 to discharge the gas purified by the dust removal box 5.

[0018] The use of the present invention is as follows: 1. Grains containing impurities enter the vibrating screen 2 through the feed hopper 25. After being screened by the multi-layer screen, the larger impurities are filtered out and discharged through the large impurity discharge pipe 21. The heavier impurities are screened out and discharged from the heavy impurity discharge pipe 22 at the bottom of the vibrating screen 2. The grains screened by the multi-layer screen enter the winnowing box 3 through the first grain discharge hopper 23 for winnowing; 2. In the air separation box 3, the suction force generated by the air separator 32 sucks away the lighter impurities in the grain, and then the lighter impurities continue to settle in the sedimentation box 4, and are collected to the light impurity discharge pipe 42 through the light impurity conveying pipe 41 and discharged. The grain filtered again by the air separation is discharged through the second grain hopper 31, falls onto the conveyor belt 7, and is transported to the external storage bag (not shown); 3. After sedimentation in the sedimentation box 4, the remaining light gas containing dust is sucked into the dust removal box by the negative pressure generated by the dust removal motor 62. In the filter chamber 57, after filtering and sedimentation by the filter bag 52, the blocked dust is discharged through the dust discharge hopper 54. The gas purified by the filter bag 52 enters the suction chamber 58 and is finally discharged through the exhaust box 61, completing the screening and dust removal of the grain.

[0019] For further information, please see the attached Figure 2, the front rollers 11 and the rear rollers 12 are connected to the left and right lower corners of the vehicle-mounted platform 1 through brackets to support the convenient movement of the vehicle-mounted platform 1. The front roller 11 is connected to the steering wheel 13 through a rotating shaft, and the rear roller 12 is connected to the power supply 14 through a driving motor to drive the vehicle-mounted platform 1 to move. Four positioning piles 15 for fixing the vehicle-mounted platform 1 are also provided on both sides of the vehicle-mounted platform 1. In this embodiment, the grain dust collector can be conveniently moved as a whole through the vehicle-mounted platform 1, and the vehicle-mounted platform 1 can be positioned in various terrain positions through the positioning piles 15, which provides convenience for grain screening and impurity removal, and improves the applicability of the equipment.

[0020] For further information, please see the attached Figure 2 A vibration motor 24 is fixedly installed at the middle of both sides of the vibration screen 2, and a control box 16 is fixedly installed on the side of the vehicle-mounted platform 1. The control box 16 is electrically connected to the power supply 14, and the two vibration motors 24 are electrically connected to the control box 16. The start and stop of the vibration screen 2 can be controlled by the control box 16. A feed hopper 25 is connected to the top of the vibration screen 2 to receive the grain to be filtered and impurities removed, and form a uniform grain waterfall flow into the vibration screen 2.

[0021] In this embodiment, multiple layers of screens are arranged inside the vibrating screen 2, and the mesh diameter of the screens gradually decreases from the upper layer to the lower layer, which is used to screen impurities of different sizes in the grain. A plurality of manual impurity removal holes are also arranged on the top and side walls of the vibrating screen 2 corresponding to each layer of screens. When large impurities accumulate on the screens, they can be cleaned manually to avoid equipment shutdown caused by impurity blockage. After the grain passes through the vibration screening of the vibrating screen 2, larger impurities and heavier impurities are screened and separated, and discharged from the large impurity discharge pipe 21 and the heavy impurity discharge pipe 22 respectively.

[0022] For further information, please see the attached Figure 2 The bottom of the light impurity conveying pipe 41 is connected to a light impurity discharge pipe 42 for collecting light impurities. A propulsion auger is installed in the light impurity discharge pipe 42 to push the light impurities to the outlet position on one side of the vehicle-mounted platform 1 for discharge.

[0023] In this embodiment, light impurities in the grain are sucked by the air separation box 3 and pushed into the sedimentation box 4. Under the action of gravity and airflow, light impurities such as heavy rice husks and grains are precipitated and fall into the light impurity discharge pipe 42 through the light impurity conveying pipe 41. The light impurity discharge pipe 42 is externally connected to a driving motor. Under the action of the driving motor, the propulsion auger pushes the light impurities to one side of the vehicle-mounted platform 1 for collection and discharge, thereby realizing the screening and removal of light impurities. After multiple screenings, the impurity removal rate in the grain is high, and the impurity content in the grain can be reduced from 10% to 0.5%, meeting the processing standard requirements.

[0024] For further information, please see the attached Figure 6The air pipe nozzle 53 is connected to the compressed air bag 55 through the air pipeline, and an electromagnetic pulse valve 56 is arranged in the middle of the gas pipeline to control the air pipe nozzle 53 to provide a pulse vibration airflow to the filter bag 52, so as to impact and vibrate and remove the dust on the outer surface of the filter bag 52. In this embodiment, the air pipe nozzle 53 and the filter bag 52 are evenly distributed in an array inside the suction chamber 58, and a high-pressure pulse airflow is formed by the control of the electromagnetic pulse valve 56 and blown into the filter bag 52. At the moment of high-speed airflow injection, each filter bag 52 can obtain the same expansion and shaking effect, and the injection airflow pressure is large and the pulse is stable, which is easy to control, thereby avoiding the phenomenon of large expansion and shaking amplitude in the middle and small expansion and shaking amplitude on both sides, resulting in uneven cleaning effect, avoiding filter bag blockage, and improving filtering and dust cleaning efficiency.

[0025] For further information, please see the attached Figure 6 The interior of the dust removal box 5 is divided into a filter chamber 57 and an air intake chamber 58 by a partition 51. The filter chamber 57 and the air intake chamber 58 are connected through a filter bag 52. The outer ends of the air intake chamber 58 are connected to the dust removal fan 6 through air ducts, which are used to suck the air out of the air intake chamber 58 to form a negative pressure, so that the dust-containing gas can be filtered by the filter bag 52 and enter the air intake chamber 58 from the filter chamber 57 to achieve gas filtering. Through the closed linkage dust removal method, the working environment is protected and dust pollution and fire hazards are avoided.

[0026] For further information, please see the attached Figure 4 The two dust removal fans 6 are respectively connected to dust removal motors 62 for driving the dust removal fans 6 to rotate through rotating shafts, and the base of the dust removal motor 62 is fixed above the vehicle-mounted platform 1.

[0027] For further information, please see the attached Figure 1-2 The conveyor belt 7 is fixed to the bottom of the vehicle-mounted platform 1, and the conveyor belt 7 is driven by a conveyor motor 71. The conveyor motor 71 is electrically connected to the power supply 14 and is used to drive the conveyor belt 7 to move. One end of the conveyor belt is arranged below the second grain hopper 31. In this embodiment, a windproof cover is also provided above the conveyor belt 7 to prevent the grain from being blown off by the wind, and is used to transport the clean grain after filtering and impurity removal to an external storage box (not shown).

[0028] The present invention is a multi-linked grain dust collector, which is suitable for storage equipment in the grain industry. Through the multi-linked vibration screening structure, the impurity content in the grain can be reduced from 10% to 0.5%, meeting the processing standard requirements. At the same time, through the fully enclosed dust removal linkage structure, the working environment is protected and dust pollution and fire hazards are avoided.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-linked grain dust collector, characterized in that: The invention comprises a vehicle-mounted platform (1) and a vibrating screen (2) installed on the vehicle-mounted platform (1) and arranged obliquely, wherein the vibrating screen (2) is used to filter larger impurities in grains; the lower end of the vibrating screen (2) is connected to a wind separation box (3) for extracting and filtering lighter impurities in grains; one side of the wind separation box (3) is connected to a sedimentation box (4) for sedimenting light impurities; one side of the sedimentation box (4) is connected to a dust removal box (5) through a pipeline; both sides of the outer end of the dust removal box (5) are connected to a dust removal fan (6) through air ducts for extracting air and for filtering the incoming impurities. The air entering the dust removal box (5) is filtered; a conveyor belt (7) for conveying grain is also installed at the bottom of the air separation box (3); a multi-layer mesh structure is provided inside the vibrating screen (2) to screen and remove impurities from the grain; large impurity discharge pipes (21) are provided on both sides of the vibrating screen (2), and larger impurities filtered out by the vibrating screen (2) are discharged through the large impurity discharge pipes (21); heavy impurity discharge pipes (22) are provided on both sides of the lower end of the vibrating screen (2), and heavier impurities filtered out by the vibrating screen (2) are discharged through the heavy impurity discharge pipes (22). The heavy impurities are discharged through a discharge pipe (22); a first grain discharge hopper (23) is provided at the middle of the lower end of the vibrating screen (2) and is connected to the air separation box (3); the air separation box (3) is connected to the first grain discharge hopper (23) through a vertical air duct to filter the grain again; a second grain discharge hopper (31) is provided at the bottom of the air separation box (3); the grain that has been filtered again falls onto the conveyor belt (7) through the second grain discharge hopper (31); a wind separator (32) is provided at the top of the air separation box (3) to collect lighter impurities in the grain; the sedimentation A light impurity conveying pipe (41) for collecting light impurities is provided below the box (4); a partition (51) is fixed on the inner side of the dust removal box (5), and filter bags (52) are evenly fixed on the partition (51); an air pipe nozzle (53) is provided inside the dust removal box (5) and above the filter bags (52); a dust discharge hopper (54) for collecting dust is fixed at the bottom of the dust removal box (5); and an exhaust box (61) is installed on the top of the two dust removal fans (6) for discharging the gas purified by the dust removal box (5).

2. A multi-linked grain dust collector according to claim 1, characterized in that: The vehicle-mounted platform (1) is connected to a front roller (11) and a rear roller (12) via a bracket at the left and right lower corners; the front roller (11) is connected to a steering wheel (13) via a rotating shaft; the rear roller (12) is connected to a power source (14) via a driving motor for driving the vehicle-mounted platform (1) to move; and a plurality of positioning piles (15) for fixing the vehicle-mounted platform (1) are also provided on both sides of the vehicle-mounted platform (1).

3. A multi-linked grain dust collector according to claim 2, characterized in that: Vibration motors (24) are fixedly mounted at the middle positions of both sides of the vibration screen (2); a control box (16) is fixedly mounted on one side of the vehicle-mounted platform (1); the control box (16) is electrically connected to the power supply (14); the two vibration motors (24) are electrically connected to the control box (16); a plurality of layers of screens are arranged inside the vibration screen (2) for screening impurities of different sizes in the grain; a feed hopper (25) is connected to the top of the vibration screen (2) for receiving the grain to be filtered and decontaminated.

4. The multi-linked grain dust collector according to claim 1, characterized in that: The bottom of the light impurity conveying pipe (41) is connected to a light impurity discharge pipe (42) for collecting light impurities, and a propulsion auger is installed in the light impurity discharge pipe (42) for pushing the light impurities to one side of the vehicle-mounted platform (1) for discharge.

5. The multi-linked grain dust collector according to claim 1, characterized in that: The air pipe nozzle (53) is connected to a compressed air bag (55) via a gas pipeline. An electromagnetic pulse valve (56) is provided in the middle of the gas pipeline for controlling the air pipe nozzle (53) to provide a pulsed vibrating airflow to the filter bag (52), thereby impacting and vibrating the filter bag (52) to remove dust left on the outer surface of the filter bag (52).

6. The multi-linked grain dust collector according to claim 1, characterized in that: The interior of the dust removal box (5) is divided into a filter chamber (57) and an air suction chamber (58) by the partition (51); the filter chamber (57) and the air suction chamber (58) are connected via the filter bag (52); and both sides of the outer end of the air suction chamber (58) are connected to the dust removal fan (6) via air ducts for sucking away air to form negative pressure.

7. The multi-linked grain dust collector according to claim 1, characterized in that: The two dust removal fans (6) are respectively connected to dust removal motors (62) for driving the dust removal fans (6) to rotate via rotating shafts, and the base of the dust removal motor (62) is fixed above the vehicle-mounted platform (1).

8. The multi-linked grain dust collector according to claim 2, characterized in that: The conveyor belt (7) is fixed to the lower part of the vehicle-mounted platform (1), and the conveyor belt (7) is driven by a conveyor motor (71). The conveyor motor (71) is electrically connected to the power source (14) and is used to convey the filtered and impurity-removed grain to an external storage box.

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