Agricultural product multi-stage screening cleaning device

Abstract

The application relates to the technical field of screening devices, and discloses a multi-stage screening and cleaning device for agricultural products, which comprises a dustproof and soundproof bin, support wheels are arranged on the two sides of the bottom of the dustproof and soundproof bin, a double-layer straight-cylinder filtering screen is arranged between the support wheels, the double-layer straight-cylinder filtering screen comprises an outer straight cylinder and an inner straight cylinder, and the outer straight cylinder and the inner straight cylinder are fixedly connected; the multi-stage screening and cleaning device for agricultural products is characterized in that the double-layer straight-cylinder filtering screen composed of the outer straight cylinder and the inner straight cylinder is arranged, small sieve holes are arranged on the side of the outer straight cylinder, large sieve holes are arranged on the side of the inner straight cylinder, the material is directly sent into the inner straight cylinder through a transverse discharge pipe of a feeding hopper, the bottom of the dustproof and soundproof bin is divided into a foreign matter discharging port and a first discharge port through a partition plate, and a second discharge port is arranged at the lower end of the protruding cylinder, so that the three-stage separation of large foreign matter interception, main grain collection and small foreign matter removal can be completed in the same rotary screen cylinder.

Description

Technical Field

[0001] This invention relates to the field of screening device technology, specifically to a multi-stage screening and cleaning device for agricultural products. Background Technology

[0002] Agricultural products typically contain a large amount of impurities after harvest, such as straw, gravel, soil, shriveled grains, grass seeds, and dust. These impurities must be screened and cleaned before proceeding to subsequent drying, storage, or further processing stages. Multi-stage screening and cleaning devices are crucial equipment in the initial processing of agricultural products such as grains, oilseeds, and seeds, and their performance directly affects processing efficiency and finished product quality. With the increasing scale of agricultural production, the market demands higher processing capacity, grading accuracy, and operational stability from screening equipment.

[0003] Chinese patent CN121372808A discloses a multi-stage sorting device for agricultural products. The device includes a feed hopper, an inner cone, an outer cone, and coarse and fine screens mounted on them respectively. A motor drives the inner and outer cones to rotate coaxially. Material enters the inner cone and passes through the coarse and fine screens sequentially for two-stage screening. A conical brush roller is installed between the inner and outer cones to clean the screen surface. This design achieves integrated double-layer sleeve-type multi-stage screening, reducing the space requirements associated with serially connecting equipment.

[0004] The existing devices mentioned above still have shortcomings in practical applications: on the one hand, the screen cylinder lacks an effective material axial guiding and tumbling structure, resulting in short material residence time and insufficient tumbling, leading to a low fine material screening rate and easy entrainment of fine material in coarse material; on the other hand, the conical brush roller is located in the interlayer between the inner and outer conical cylinders, and can only clean the screen surface from the inside. It has limited effect on removing tightly embedded wet materials or fibrous impurities. After long-term operation, the screen holes are still prone to clogging, requiring manual cleaning after shutdown, which affects the continuity of operation. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a multi-stage screening and cleaning device for agricultural products, which has the functions of multi-stage screening and self-cleaning and anti-clogging, thus solving the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A multi-stage screening and cleaning device for agricultural products includes a dustproof and soundproof chamber. Support wheels are installed on both sides of the bottom of the chamber. A double-layer straight-cylinder filter screen is mounted between the support wheels. The double-layer straight-cylinder filter screen includes an outer straight cylinder and an inner straight cylinder, which are fixedly connected. Small sieve holes and large sieve holes are respectively opened on the sides of the outer and inner straight cylinders. A feed hopper is provided on one side of the dustproof and soundproof chamber, and a transverse feed channel is provided at the lower end of the feed hopper. The discharge pipe extends through the dustproof and soundproof chamber and into the inner straight cylinder. A partition is fixedly installed at the bottom of the dustproof and soundproof chamber. The upper end of the partition is close to the bottom of the outer straight cylinder away from the feed hopper. A second waste outlet and a discharge outlet are respectively provided on both sides of the partition. The second waste outlet and the discharge outlet are both located at the bottom of the dustproof and soundproof chamber. A protruding cylinder is also provided at the end of the dustproof and soundproof chamber away from the feed hopper. A first waste outlet is provided at the lower end of the protruding cylinder.

[0007] Preferably, the dustproof and soundproof chamber includes a bottom chamber and a top cover, with one end of the bottom chamber and the top cover hinged together. The support wheels are symmetrically installed on both sides of the bottom chamber. An annular guide rail is provided on the outer side wall of the outer straight cylinder, and the annular guide rail is adapted to the support wheels. The protruding cylinder is divided into a lower half-cylinder and an upper half-cylinder, which are respectively fixed to one end of the bottom chamber and the top cover. The first discharge port is located at the lower end of the lower half-cylinder. A notch is opened at the end of the bottom chamber and the top cover facing the feed hopper, and the transverse discharge pipe is inserted into the interior of the dustproof and soundproof chamber through the notch.

[0008] Preferably, a circular baffle is fixedly installed at one end of the outer straight cylinder and the inner straight cylinder. An insertion hole is provided at the center of the circular baffle. The insertion hole communicates with the interior of the inner straight cylinder, and a transverse discharge pipe extends through the insertion hole into the interior of the inner straight cylinder.

[0009] Preferably, the outer straight cylinder extends to the other side of the partition at one end away from the circular baffle, and there is a gap between the outer straight cylinder and the protruding cylinder.

[0010] Preferably, a helical blade is fixedly installed on the inner side wall of the outer straight cylinder.

[0011] Preferably, the diameter of the end where the inner straight cylinder is fixed to the circular baffle is smaller than the diameter of the other end, and the other end of the inner straight cylinder extends into the interior of the protruding cylinder.

[0012] Preferably, a speed reduction block is fixedly provided on the inner side wall of the inner straight cylinder.

[0013] Preferably, a slide is fixedly installed at one end of the bottom hopper, and pulleys are installed on both sides of the feed hopper, with the pulleys slidably mounted on the slide.

[0014] Preferably, a drive motor is fixedly installed at one end of the bottom compartment, and a cleaning shaft is fixedly installed at the drive end of the drive motor. The cleaning shaft extends into the interior of the bottom compartment and is provided with elastic bristles.

[0015] Preferably, the support wheels on one side of the bottom compartment are connected by a drive shaft, one end of which extends outside the bottom compartment and is connected to the sweeping shaft via a drive pulley.

[0016] Compared with the prior art, the present invention provides a multi-stage screening and cleaning device for agricultural products, which has the following beneficial effects: This multi-stage screening and cleaning device for agricultural products uses a double-layer straight-cylinder filter screen consisting of an outer straight cylinder and an inner straight cylinder. Small screen holes are opened on the side of the outer straight cylinder, and large screen holes are opened on the side of the inner straight cylinder. The material is directly fed into the inner straight cylinder by the transverse discharge pipe of the feed hopper. At the same time, the bottom of the dustproof and soundproof chamber is divided into a waste outlet and a first discharge outlet by a partition, and a second discharge outlet is set at the lower end of the protruding cylinder. This allows the material to complete the three-stage separation of large waste interception, staple grain collection and small waste removal in the same rotating screen cylinder. There is no need for multiple devices to be connected in series, which significantly reduces the equipment footprint and energy consumption.

[0017] This multi-stage screening and cleaning device for agricultural products uses spiral blades fixedly installed on the inner wall of the outer straight cylinder. The diameter of the inner straight cylinder and the circular baffle fixed installation end is set to be smaller than the diameter of the other end. At the same time, a deceleration block is fixedly installed on the inner wall of the inner straight cylinder. When the material rotates with the double-layer straight cylinder filter screen, it is subjected to the triple action of axial pushing by the spiral blades, guidance by the cross-sectional contraction of the conical inner cylinder, and the tumbling and agitation by the deceleration block. This prolongs the residence time and tumbling path of the material in the screen cylinder, improves the probability of fine material passing through the small screen holes, and reduces the entrainment of coarse material on fine material.

[0018] This multi-stage screening and cleaning device for agricultural products uses a drive motor fixedly installed at one end of the bottom chamber, with a cleaning shaft equipped with elastic bristles at its drive end. The support wheel on one side of the bottom chamber is connected to the cleaning shaft via a transmission shaft, and the power is transmitted to the cleaning shaft by a transmission pulley. This allows the cleaning shaft to rotate synchronously with the double-layer straight cylinder filter screen. The elastic bristles continuously sweep the small screen holes on the outer wall of the outer cylinder, effectively preventing damp materials or fibrous impurities from clogging the screen holes. No manual cleaning is required, ensuring the continuity of the screening operation. Attached Figure Description

[0019] Figure 1 This is one of the three-dimensional structural schematic diagrams of the multi-stage screening and cleaning device for agricultural products of the present invention; Figure 2 This is the second three-dimensional structural schematic diagram of the multi-stage screening and cleaning device for agricultural products of the present invention; Figure 3This is a three-dimensional structural breakdown diagram of the multi-stage screening and cleaning device for agricultural products of the present invention; Figure 4 This is a three-dimensional structural cross-sectional view of the multi-stage screening and cleaning device for agricultural products of the present invention; Figure 5 This is the third three-dimensional structural schematic diagram of the multi-stage screening and cleaning device for agricultural products of the present invention; Figure 6 This is a three-dimensional structural cross-sectional view of the double-layer straight cylindrical filter screen in this invention; Figure 7 This is a three-dimensional structural diagram of the double-layer straight cylindrical filter screen in this invention.

[0020] In the diagram: 1. Dustproof and soundproof chamber; 11. Bottom chamber; 12. Top cover; 13. Support wheel; 14. Baffle; 15. Discharge port; 16. Protruding cylinder; 17. First waste outlet; 18. Second waste outlet; 19. Slide frame; 2. Double-layer straight cylinder filter screen; 21. Outer straight cylinder; 211. Circular guide rail; 212. Spiral blade; 22. Inner straight cylinder; 221. Speed ​​reduction block; 23. Small screen hole; 24. Large screen hole; 25. Circular baffle; 26. Insertion hole; 3. Feed hopper; 31. Horizontal discharge pipe; 32. Pulley; 33. Drive shaft; 4. Drive motor; 41. Cleaning shaft. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] Example 1 Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 This invention provides a multi-stage screening and cleaning device for agricultural products, including a dustproof and soundproof chamber 1. Support wheels 13 are installed on both sides of the bottom of the dustproof and soundproof chamber 1. A double-layer straight-cylinder filter screen 2 is mounted between the support wheels 13. The double-layer straight-cylinder filter screen 2 includes an outer straight cylinder 21 and an inner straight cylinder 22, which are fixedly connected. Small sieve holes 23 and large sieve holes 24 are respectively opened on the sides of the outer straight cylinder 21 and the inner straight cylinder 22. A feed hopper 3 is provided on one side of the dustproof and soundproof chamber 1, and a transverse feed hole is provided at the lower end of the feed hopper 3. The discharge pipe 31 extends through the dustproof and soundproof chamber 1 and into the inner straight cylinder 22. A partition 14 is fixedly installed at the bottom of the dustproof and soundproof chamber 1. The upper end of the partition 14 is close to the bottom of the outer straight cylinder 21 away from the feed hopper 3. A second waste outlet 18 and a discharge outlet 15 are respectively provided on both sides of the partition 14. Both the second waste outlet 18 and the discharge outlet 15 are located at the bottom of the dustproof and soundproof chamber 1. A protruding cylinder 16 is also provided at the end of the dustproof and soundproof chamber 1 away from the feed hopper 3. A first waste outlet 17 is provided at the lower end of the protruding cylinder 16.

[0023] As can be seen from the above, the dustproof and soundproof chamber 1, as the outer shell of the whole machine, plays the role of dust reduction and noise reduction. Inside, the double-layer straight cylinder filter screen 2 is supported by the support wheel 13, allowing it to rotate around its own axis. The double-layer straight cylinder filter screen 2 consists of a concentric sleeve structure composed of an outer straight cylinder 21 and an inner straight cylinder 22. The small screen holes 23 on the side of the outer straight cylinder 21 are used to let out fine impurities and retain medium-sized particles. The large screen holes 24 on the side of the inner straight cylinder 22 are used to retain large-sized impurities and allow medium-sized particles and fine impurities to pass through. The feed hopper 3 discharges through a transverse discharge pipe. 31 The material to be processed is directly fed into the inner straight cylinder 22. The upper end of the partition 14 is close to the bottom of the end of the outer straight cylinder 21, dividing the bottom space of the dustproof and soundproof chamber 1 into two independent collection areas. The area near the feed hopper 3 corresponds to the second impurity outlet 18, and the area away from the feed hopper 3 corresponds to the discharge outlet 15. The protruding cylinder 16 is set at the end of the dustproof and soundproof chamber 1, and the first impurity outlet 17 at its lower end is used to receive large-diameter impurities discharged from the end of the inner straight cylinder 22, thus forming independent collection channels for the three materials.

[0024] When using this device, first rotate the support wheel 13, which drives the double-layer straight cylinder filter screen 2 to rotate around its own axis. Then, the mixture of agricultural products to be processed is fed into the feed hopper 3. The material enters the inner cylinder 22 directly through the transverse discharge pipe 31. During the rotation of the double-layer straight cylinder filter screen 2, the material in the inner cylinder 22 continuously tumbles. Medium-sized particles smaller than the diameter of the large sieve hole 24 and fine impurities pass through the large sieve hole 24 and enter the interlayer space between the outer cylinder 21 and the inner cylinder 22. Large-sized impurities larger than the diameter of the large sieve hole 24, such as straw pieces and stones, are trapped inside the inner cylinder 22 and move towards the end with the rotation. Finally, they fall from the end of the inner cylinder 22 into the protruding cylinder 16 and through the first impurity outlet 1. 7. Medium-sized particles and fine impurities that enter the interlayer space continue to rotate and tumble with the outer straight cylinder 21. Fine impurities such as dust and grass seeds with a particle size smaller than the small sieve holes 23 of the outer straight cylinder 21 pass through the small sieve holes 23 and fall to the bottom of the dustproof and soundproof chamber 1, fall on the area of ​​the partition plate 14 near the feed hopper 3 and are discharged from the second impurity outlet 18. Medium-sized particles with a particle size larger than the diameter of the small sieve holes 23, i.e., staple grains, are intercepted in the interlayer space and move towards the end with rotation. When they reach the end of the outer straight cylinder 21, they pass over the upper end of the partition plate 14 and fall into the area of ​​the partition plate 14 away from the feed hopper 3 and are discharged from the discharge outlet 15. Thus, the three-stage separation of intercepting large impurities, collecting staple grains and removing small impurities is achieved simultaneously in one rotary screening process.

[0025] Example 2 like Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7As shown, the difference between this embodiment and the above embodiment is that the dustproof and soundproof chamber 1 includes a bottom chamber 11 and a top cover 12. One end of the bottom chamber 11 and the top cover 12 are hinged together. Support wheels 13 are symmetrically installed on both sides of the bottom chamber 11. An annular guide rail 211 is provided on the outer side wall of the outer straight cylinder 21. The annular guide rail 211 is adapted to the support wheel 13. The protruding cylinder 16 is divided into a lower half cylinder and an upper half cylinder. The lower half cylinder and the upper half cylinder are respectively fixed to one end of the bottom chamber 11 and the top cover 12. The first discharge port 17 is provided at the lower end of the lower half cylinder. The bottom chamber 11 and the top cover 12 have notches at the end facing the feed hopper 3. The transverse discharge pipe 31 is inserted into the interior of the dustproof and soundproof chamber 1 through the notch.

[0026] As can be seen from the above, the dustproof and soundproof chamber 1 adopts a structure in which the bottom chamber 11 and the top cover 12 are hinged separately. The top cover 12 can be flipped up and opened to facilitate the maintenance and replacement of the double-layer straight cylinder filter screen 2 inside. The support wheels 13 are symmetrically installed on both sides of the bottom chamber 11 to support the annular guide rail 211 on the outer wall of the outer straight cylinder 21, so that the double-layer straight cylinder filter screen 2 can rotate smoothly on the support wheels 13. The protruding cylinder 16 is divided into a lower half cylinder and an upper half cylinder that are fixed on the bottom chamber 11 and the top cover 12 respectively. When the top cover 12 is opened, the protruding cylinder 16 is also separated, which does not affect the removal of the screen cylinder. The notch at the end of the bottom chamber 11 and the top cover 12 facing the feed hopper 3 provides an insertion channel for the transverse discharge pipe 31, so that the feed hopper 3 does not need to move with the opening and closing of the top cover 12.

[0027] A circular baffle 25 is fixedly installed at one end of the outer straight cylinder 21 and the inner straight cylinder 22. An insertion hole 26 is opened at the center of the circular baffle 25. The insertion hole 26 communicates with the interior of the inner straight cylinder 22. The transverse discharge pipe 31 extends through the insertion hole 26 and into the interior of the inner straight cylinder 22.

[0028] As can be seen from the above, the circular baffle 25 is fixed at the end of the outer straight cylinder 21 and the inner straight cylinder 22 facing the feed hopper 3, which serves to seal the end of the screen cylinder and prevent material from leaking from that end. The insertion hole 26 at the center of the circular baffle is connected to the inside of the inner straight cylinder 22, which is used to allow the transverse discharge pipe 31 to pass through and extend into the inside of the inner straight cylinder 22. At the same time, the circular baffle 25 and the transverse discharge pipe 31 form a rotational fit, which does not affect the rotation of the double-layer straight cylinder filter screen 2.

[0029] The outer straight cylinder 21 extends to the other side of the partition 14 from the end away from the circular baffle 25, and there is a gap between the outer straight cylinder 21 and the protruding cylinder 16.

[0030] As can be seen from the above, the end of the outer straight cylinder 21 extends to the side of the partition 14 away from the feed hopper 3, so that the medium-sized material trapped in the interlayer space can pass through the partition 14 and fall into the discharge port 15 area when it reaches the end of the outer straight cylinder 21. There is a gap between the end of the outer straight cylinder 21 and the protruding cylinder 16, so that the large-sized impurities discharged from the end of the outer straight cylinder 21 will not fall into the protruding cylinder 16.

[0031] A spiral blade 212 is fixedly installed on the inner wall of the outer straight cylinder 21.

[0032] As can be seen from the above, the spiral blades 212 are arranged in a spiral shape along the inner side wall of the outer straight cylinder 21. When the double-layer straight cylinder filter screen 2 rotates, the spiral blades 212 generate a continuous axial thrust on the material in the interlayer space, forcing the material to move from one end of the feed hopper 3 to the end, preventing the material from accumulating or stagnating in the screen cylinder, ensuring that the material can pass through the entire screening area in an orderly manner and finally be discharged from the end of the outer straight cylinder 21 to the discharge port 15.

[0033] The diameter of the inner straight cylinder 22 and the circular baffle 25 fixed installation end is smaller than the diameter of the other end, and the other end of the inner straight cylinder 22 extends into the interior of the protruding cylinder 16.

[0034] As can be seen from the above, the inner straight cylinder 22 adopts a conical structure with a gradually increasing diameter from the feed end to the discharge end. The smaller diameter at the feed end causes the material to tumble in a small cross-sectional area after entering, increasing the collision frequency between materials and the contact opportunities with the screen surface. As the material moves towards the end, the diameter of the inner straight cylinder 22 gradually increases, causing the material to spread out, which is conducive to large-diameter impurities smoothly entering the protruding cylinder 16 through the end opening. The end of the inner straight cylinder 22 extends into the protruding cylinder 16 to ensure that large-diameter impurities can be reliably guided into the first impurity outlet 17 without spilling.

[0035] A speed reduction block 221 is fixedly installed on the inner side wall of the inner straight cylinder 22.

[0036] As can be seen from the above, the deceleration block 221 protrudes from the inner wall surface of the inner straight cylinder 22. When the screen cylinder rotates, it obstructs and tumbles the material moving with the cylinder wall. After the material hits the deceleration block 221, it is thrown up or changes its direction of movement, thereby increasing the number of times the material tumbles and the residence time in the inner straight cylinder 22. This gives the material more opportunities to contact the large screen hole 24 of the inner straight cylinder 22, increasing the probability of fine material passing through the large screen hole 24.

[0037] Example 3 like Figure 2 , Figure 3 and Figure 5 As shown, the difference between this embodiment and the above embodiment is that a slide 19 is fixedly installed at one end of the bottom hopper 11, and pulleys 32 are installed on both sides of the feed hopper 3, with the pulleys 32 slidably mounted on the slide 19.

[0038] As can be seen from the above, the feed hopper 3 is mounted on the slide 19 on the bottom chamber 11 by the pulleys 32 on both sides, so that the feed hopper 3 can slide horizontally along the slide 19. When it is necessary to open the top cover 12 for maintenance, the feed hopper 3 can be slid backward along the slide 19 to disengage it from the notch position, so as to avoid the feed hopper 3 from obstructing the opening of the top cover 12. After the maintenance is completed, the feed hopper 3 can be pushed back to its original position to restore the working state.

[0039] A drive motor 4 is fixedly installed at one end of the bottom compartment 11. A cleaning shaft 41 is fixedly installed at the drive end of the drive motor 4. The cleaning shaft 41 extends into the interior of the bottom compartment 11 and is provided with elastic bristles.

[0040] As can be seen from the above, the drive motor 4 provides rotational power to the sweeping shaft 41. The sweeping shaft 41 extends along the length of the bottom chamber 11 and is located below the outer wall of the outer straight cylinder 21. The elastic bristles on it contact the outer wall of the outer straight cylinder 21. When the sweeping shaft 41 rotates, the elastic bristles continuously brush the small sieve holes 23 on the outer wall of the outer straight cylinder 21, brushing off the wet material or fibrous impurities that are blocked in the sieve holes, and keeping the small sieve holes 23 unobstructed.

[0041] The support wheels 13 on one side of the bottom compartment 11 are connected by a drive shaft 33. One end of the drive shaft 33 extends to the outside of the bottom compartment 11 and is connected to the cleaning shaft 41 via a drive belt pulley.

[0042] As can be seen from the above, the drive shaft 33 connects the two support wheels 13 on the same side of the bottom chamber 11 into one unit, so that the two support wheels 13 rotate synchronously to ensure the smooth rotation of the double-layer straight cylinder filter screen 2. The end of the drive shaft 33 that extends outside the bottom chamber 11 transmits the rotational power to the cleaning shaft 41 through the drive pulley, so that the cleaning shaft 41 and the support wheel 13 are linked together, and there is no need to configure a separate power source for the cleaning shaft 41.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage screening and cleaning device for agricultural products, comprising a dustproof and soundproof chamber (1), characterized in that: Support wheels (13) are installed on both sides of the bottom of the dustproof and soundproof chamber (1). A double-layer straight cylindrical filter screen (2) is installed between the support wheels (13). The double-layer straight cylindrical filter screen (2) includes an outer straight cylinder (21) and an inner straight cylinder (22). The outer straight cylinder (21) and the inner straight cylinder (22) are fixedly connected. Small sieve holes (23) and large sieve holes (24) are respectively opened on the sides of the outer straight cylinder (21) and the inner straight cylinder (22). A feed hopper (3) is provided on one side of the dustproof and soundproof chamber (1). A transverse discharge pipe (31) is provided at the lower end of the feed hopper (3). The dustproof and soundproof chamber (1) extends into the inner straight cylinder (22); a partition (14) is fixedly installed at the bottom of the inner layer of the dustproof and soundproof chamber (1), the upper end of the partition (14) is close to the bottom of the outer straight cylinder (21) away from the feed hopper (3), and a second discharge port (18) and a discharge port (15) are respectively provided on both sides of the partition (14), and the second discharge port (18) and the discharge port (15) are both opened at the bottom of the dustproof and soundproof chamber (1); a protruding cylinder (16) is also provided at the end of the dustproof and soundproof chamber (1) away from the feed hopper (3), and a first discharge port (17) is provided at the lower end of the protruding cylinder (16).

2. The multi-stage screening and cleaning device for agricultural products according to claim 1, characterized in that: The dustproof and soundproof chamber (1) includes a bottom chamber (11) and a top cover (12). The bottom chamber (11) and the top cover (12) are hinged at one end. The support wheels (13) are symmetrically installed on both sides of the bottom chamber (11). The outer wall of the outer straight cylinder (21) is provided with an annular guide rail (211). The annular guide rail (211) is adapted to the support wheels (13). The protruding cylinder (16) is divided into a lower half cylinder and an upper half cylinder. The lower half cylinder and the upper half cylinder are respectively fixed at one end of the bottom chamber (11) and the top cover (12). The first discharge port (17) is located at the lower end of the lower half cylinder. The bottom chamber (11) and the top cover (12) have a notch at one end facing the feed hopper (3). The transverse discharge pipe (31) is inserted into the interior of the dustproof and soundproof chamber (1) through the notch.

3. The multi-stage screening and cleaning device for agricultural products according to claim 1, characterized in that: A circular baffle (25) is fixedly installed at one end of the outer straight cylinder (21) and the inner straight cylinder (22). A socket (26) is provided at the center of the circular baffle (25). The socket (26) is connected to the interior of the inner straight cylinder (22). A transverse discharge pipe (31) extends through the socket (26) into the interior of the inner straight cylinder (22).

4. The multi-stage screening and cleaning device for agricultural products according to claim 3, characterized in that: The outer straight cylinder (21) extends from one end away from the circular baffle (25) to the other side of the partition (14), and there is a gap between the outer straight cylinder (21) and the protruding cylinder (16).

5. The multi-stage screening and cleaning device for agricultural products according to claim 1, characterized in that: The inner wall of the outer straight cylinder (21) is fixedly fitted with helical blades (212).

6. The multi-stage screening and cleaning device for agricultural products according to claim 3, characterized in that: The diameter of the inner straight cylinder (22) and the circular baffle (25) fixed installation end is smaller than the diameter of the other end, and the other end of the inner straight cylinder (22) extends into the interior of the protruding cylinder (16).

7. The multi-stage screening and cleaning device for agricultural products according to claim 1, characterized in that: The inner wall of the inner straight cylinder (22) is fixedly provided with a speed reduction block (221).

8. The multi-stage screening and cleaning device for agricultural products according to claim 2, characterized in that: A slide (19) is fixedly installed at one end of the bottom hopper (11), and pulleys (32) are installed on both sides of the feed hopper (3). The pulleys (32) are slidably mounted on the slide (19).

9. The multi-stage screening and cleaning device for agricultural products according to claim 2, characterized in that: A drive motor (4) is fixedly installed at one end of the bottom compartment (11), and a cleaning shaft (41) is fixedly installed at the drive end of the drive motor (4). The cleaning shaft (41) extends into the interior of the bottom compartment (11), and elastic bristles are provided on the cleaning shaft (41).

10. The multi-stage screening and cleaning device for agricultural products according to claim 9, characterized in that: The support wheels (13) on one side of the bottom compartment (11) are connected by a drive shaft (33). One end of the drive shaft (33) extends outside the bottom compartment (11) and is connected to the cleaning shaft (41) via a drive pulley.

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