A lifting and screening machine for millet processing

Abstract

The present application belongs to the technical field of millet processing, and relates to a lifting and screening machine for processing yellow millet, which comprises a rotating cylinder, a belt feeding machine and a material collecting assembly. The rotating cylinder is rotatably arranged on a base, and a screening assembly is arranged in the rotating cylinder through elastic members. The screening assembly comprises coaxially sleeved screening cylinders of different levels, and the screen holes are gradually increased. An end plate is fixed to one end of each screening cylinder. A feeding pipe with a feeding port is arranged on the side wall of the base through a support frame, and a connecting pipe is sleeved on the end of the feeding pipe. A driving motor drives the rotating cylinder to rotate, and the roller cooperates with the hemispherical protrusion to generate axial reciprocating vibration, so that the yellow millet passes through each layer of the screening cylinders in a compound motion, and the particle size grading is realized. The yellow millet is divided into four grades of whole millet, large broken millet, small broken millet and fine bran powder at one time, and is discharged from the corresponding discharge ports and continuously collected by independent belt discharge machines, so that the process flow is simplified, the increase of broken millet caused by traditional multi-device transfer is avoided, and the whole millet rate of the finished product and the processing continuity are improved.

Description

Technical Field

[0001] This invention belongs to the field of millet processing technology and relates to a lifting and screening machine for processing yellow millet. Background Technology

[0002] In the processing of millet, lifting and screening are key steps connecting the cleaning, dehulling, and grading processes. Specifically, after the cleaning process removes large impurities such as stones and grass seeds from the raw grain, the material needs to be fed into the dehulling machine via lifting equipment. The resulting mixture of brown rice and unhulled grains and husks must then be separated and graded using screening equipment to extract pure rice cores for the subsequent milling process.

[0003] In the processing of millet, existing screening equipment has several drawbacks: First, its screening structure is limited, only capable of simple impurity removal, and cannot perform multi-stage grading and separate collection of broken rice, whole rice, and unthreshed grains, necessitating the addition of multiple machines for repeated screening. Second, traditional equipment often operates intermittently, with feeding and unloading not synchronized, requiring frequent shutdowns for material discharge during screening, impacting processing continuity and production efficiency. Third, the material is prone to generating additional broken rice during multiple transfers and vibrating screenings, and fine bran powder is difficult to completely separate, affecting the purity and whole rice yield of the finished product. Therefore, there is an urgent need for an integrated device capable of continuous operation, multi-stage screening, and separate collection to solve these problems. Summary of the Invention

[0004] To address the problems existing in the background art, the present invention proposes a lifting and screening machine for processing millet.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A lifting and screening machine for processing millet includes a rotating cylinder, a belt conveyor, and a receiving assembly; the rotating cylinder is rotatably mounted on a base; a screening assembly is installed inside the rotating cylinder via an elastic element, the screening assembly including a three-stage screening cylinder, a two-stage screening cylinder, and a one-stage screening cylinder; the one-stage screening cylinder is fixedly installed inside the two-stage screening cylinder, and the two-stage screening cylinder is fixedly installed inside the three-stage screening cylinder; the screen holes on the three-stage screening cylinder, the two-stage screening cylinder, and the one-stage screening cylinder increase in size sequentially; the rotating cylinder, the three-stage screening cylinder, the two-stage screening cylinder, and the one-stage screening cylinder are coaxially arranged; one end of the three-stage screening cylinder, the two-stage screening cylinder, and the one-stage screening cylinder is aligned and fixedly mounted with an end plate. A feed pipe is fixedly installed on the side wall of the base via a support frame. The feed pipe has a feed inlet, and a connecting pipe is fitted at the end of the feed pipe. The connecting pipe communicates with the inside of the primary screening cylinder. A fixing ring is fixedly installed on the outer wall of the feed pipe. Multiple hemispherical protrusions are evenly fixedly installed on the fixing ring around the axis of the feed pipe. Multiple support plates are evenly fixedly installed on the side wall of the end plate around the axis of the connecting pipe. Rollers are rotatably installed at the ends of the support plates. The number of rollers is the same as the number of hemispherical protrusions and they abut against each other. The end of the tertiary screening cylinder, the secondary screening cylinder, and the primary screening cylinder opposite to the end plate is provided with a discharge assembly. The receiving assembly is located below the discharge assembly. The rotating cylinder is inclined on the base, and the higher end of the rotating cylinder is located on the side of the belt conveyor.

[0006] Preferably, the feeding assembly includes a sealing plate, a feeding sleeve, and a feeding port; the sealing plate is fixedly installed on the outer wall of the third-stage screening cylinder, the second-stage screening cylinder, and the first-stage screening cylinder at the end opposite to the end plate; the feeding sleeve is open at one end; the feeding sleeve is fixedly installed on the outside of the sealing plate, and a limiting ring is fixedly installed on the outer wall of the rotating cylinder, with the open end of the feeding sleeve slidably disposed in the gap between the limiting ring and the rotating cylinder; the outer wall of the feeding sleeve is provided with feeding ports at positions corresponding to the third-stage screening cylinder, the second-stage screening cylinder, the first-stage screening cylinder, and positions away from the rotating cylinder.

[0007] Preferably, the sealing plate includes a first separating ring, a second separating ring, and a third separating ring; the first separating ring is sleeved on the outer wall of the third-stage screening cylinder; the second separating ring is sleeved on the outer wall of the second-stage screening cylinder; and the third separating ring is sleeved on the outer wall of the first-stage screening cylinder; the outer diameters of the first separating ring, the second separating ring, and the third separating ring are the same and are in transition fit with the inside of the feeding sleeve.

[0008] Preferably, the elastic element includes a spring and a base plate; several springs are uniformly fixedly installed around the outer wall of the three-stage screening cylinder along the axial direction of the three-stage screening cylinder, and a base plate is fixedly installed around the inner wall of the rotating cylinder. The ends of the springs away from the three-stage screening cylinder are fixedly connected to the base plate; the end of the base plate away from the rotating cylinder is provided with an arc angle.

[0009] Preferably, the tertiary screening cylinder and the secondary screening cylinder, as well as the secondary screening cylinder and the primary screening cylinder, are fixedly connected by assembly rods.

[0010] Preferably, a sealing ring is fixedly installed at one end of the rotating cylinder near the end plate, and the inner wall of the sealing ring slides in fit with the outer wall of the three-stage screening cylinder.

[0011] Preferably, the discharge port of the belt conveyor is located above the feed port; one end of the primary screening cylinder away from the end plate extends to the outside of the secondary screening cylinder, one end of the secondary screening cylinder away from the end plate extends to the outside of the tertiary screening cylinder, and one end of the tertiary screening cylinder away from the end plate extends to the outside of the rotating cylinder.

[0012] Preferably, mounting plates are fixedly installed on both sides of the upper end face of the base, with the height of the mounting plate closer to the feed pipe being higher than the height of the mounting plate away from the feed pipe; circular guide rails are fixedly installed on both mounting plates, and rotating rings are fixedly installed on both sides of the outer wall of the rotating cylinder, with the rotating rings rotating in cooperation with the circular guide rails; a drive motor is fixedly installed in the middle of the upper end face of the base, a gear is fixedly installed on the output shaft of the drive motor, and a gear ring is fixedly installed on the outer wall of the rotating cylinder, with the gear meshing with the gear ring.

[0013] Preferably, a protective cover is fixedly installed on the upper surface of the base, and the protective cover covers the outside of the rotating cylinder and the circular guide rail.

[0014] Preferably, the receiving assembly includes four belt feeders, which are located below four feeding ports respectively, and the material receiving range of the belt feeders is greater than the movement range of the feeding ports.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention uses a belt conveyor to feed millet into a primary screening cylinder. A drive motor rotates the cylinder, causing the screening components to rotate synchronously. Simultaneously, the rollers and hemispherical protrusions engage to generate axial reciprocating vibration. The material sequentially passes through three levels of sieve holes, entering the annular cavities between each screening cylinder, and finally exiting through the corresponding discharge ports and collected by a parallel conveyor. A single feed can simultaneously separate whole millet, broken millet, and fine powder into multiple grades, improving grading efficiency and finished product purity, avoiding damage caused by multiple transfers, and achieving graded discharge of materials during transportation.

[0016] 2. This invention uses a belt conveyor to continuously load materials into the feed inlet. The material slides through a smooth pipe into a rotating screening cylinder for screening. Simultaneously, the graded materials are discharged from their respective discharge outlets and directly onto a parallel conveyor for timely and synchronous transport. This eliminates the waiting time required by frequent shutdowns for material discharge in traditional equipment, enabling the entire processing and conveying process to operate continuously and without interruption. This increases the throughput and production efficiency per unit time, while avoiding material accumulation or impact damage caused by start-ups and shutdowns.

[0017] 3. This invention uses a drive motor to continuously rotate the rotating drum, and the screening assembly rotates synchronously, causing the millet to tumble within the drum due to centrifugal force. Simultaneously, the end plate drives the rollers to roll along the hemispherical protrusion surface. When the rollers climb to the top of the protrusion, they compress the elastic element, causing the screening assembly to move axially towards the discharge end. After passing the protrusion, the elastic element returns to its original position, creating continuous axial reciprocating vibration. Rotation evenly disperses the material and accelerates its passage through the screen, while axial vibration effectively prevents screen clogging. The combination of these two factors improves screening efficiency and material flowability. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a partial structural schematic diagram of the present invention; Figure 4 This is a schematic diagram of the circular guide rail structure of the present invention; Figure 5 This is a schematic diagram of the sealing plate structure of the present invention; Figure 6 This is a schematic diagram of the material screening component structure of the present invention; Figure 7 This is a partial cross-sectional view of the present invention.

[0019] In the diagram: 1. Rotating cylinder; 2. Belt feeder; 3. Belt unloader; 4. Screening assembly; 5. Three-stage screening cylinder; 6. Two-stage screening cylinder; 7. One-stage screening cylinder; 8. Feed pipe; 9. Support frame; 10. Connecting pipe; 11. Elastic component; 12. End plate; 13. Base; 14. Feed inlet; 15. Sealing plate; 1501. First separating ring; 1502. Second separating ring; 1503. Third separating ring; 16. Discharge sleeve; 17. Discharge port; 18. Limiting ring; 19. Spring; 20. Base plate; 21. Assembly rod; 22. Sealing ring; 23. Fixing ring; 24. Hemispherical protrusion; 25. Support plate; 26. Roller; 27. Mounting plate; 28. Circular guide rail; 29. ​​Rotating ring; 30. Drive motor; 31. Gear; 32. Gear ring; 33. Protective cover. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1-7 As shown, the technical solution adopted by the present invention is as follows: A lifting and screening machine for processing millet includes a rotating cylinder 1, a belt feeder 2, and a receiving assembly. The rotating cylinder 1 is rotatably mounted on a base 13; a screening assembly 4 is installed inside the rotating cylinder 1 via an elastic element 11. The screening assembly 4 includes a three-stage screening cylinder 5, a two-stage screening cylinder 6, and a one-stage screening cylinder 7; the one-stage screening cylinder 7 is fixedly installed inside the two-stage screening cylinder 6, and the two-stage screening cylinder 6 is fixedly installed inside the three-stage screening cylinder 5; the screen holes on the three-stage screening cylinder 5, the two-stage screening cylinder 6, and the one-stage screening cylinder 7 increase in size sequentially; the rotating cylinder 1, the three-stage screening cylinder 5, the two-stage screening cylinder 6, and the one-stage screening cylinder 7 are coaxially arranged. The three-stage screening cylinder 5 and the two-stage screening cylinder 6, as well as the two-stage screening cylinder 6 and the one-stage screening cylinder 7, are fixedly connected by an assembly rod 21. This achieves concentric assembly and stable connection of the multi-stage screening cylinders, enabling multi-stage grading and screening of millet, facilitating the separate collection of materials of different particle sizes, and allowing the materials to undergo grading processing simultaneously during transportation.

[0022] Specifically, for processing yellow millet, the screen aperture diameter of the primary screening cylinder 7 is set to 2.0mm-2.5mm to intercept larger foreign objects and allow qualified whole millet to pass through; the screen aperture diameter of the secondary screening cylinder 6 is set to 1.4mm-1.8mm to intercept whole millet and allow broken millet to pass through; the screen aperture diameter of the tertiary screening cylinder 5 is set to 0.8mm-1.2mm to intercept broken millet and allow fine bran powder to pass through, thus classifying and conveying the material according to particle size. Those skilled in the art can adapt the above numerical ranges according to the variety of yellow millet and the grade of the finished product.

[0023] One end of the three-stage screening cylinder 5, the two-stage screening cylinder 6, and the one-stage screening cylinder 7 is aligned and fixedly installed with an end plate 12. A feed pipe 8 is fixedly installed on the side wall of the base 13 via a support frame 9. The feed pipe 8 has a feed inlet 14. A connecting pipe 10 is fitted at the end of the feed pipe 8, and the connecting pipe 10 communicates with the inside of the one-stage screening cylinder 7. The inside of the feed pipe 8 and the connecting pipe 10 is smooth. The discharge port of the belt feeder 2 is located above the feed inlet 14. A fixing ring 23 is fixedly installed on the outer wall of the feed pipe 8. Multiple hemispherical protrusions 24 are evenly fixedly installed on the fixing ring 23 around the axis of the feed pipe 8. Multiple support plates 25 are evenly fixedly installed on the side wall of the end plate 12 around the axis of the connecting pipe 10. Rollers 26 are rotatably installed at the ends of the support plates 25. The number of rollers 26 is the same as the number of hemispherical protrusions 24 and they abut against each other. This structure makes the inside of the feed pipe 8 and the connecting pipe 10 smooth, which makes it easy for millet to slide smoothly into the first-stage screening cylinder 7. At the same time, through the cooperation of the roller 26 and the hemispherical protrusion 24, axial vibration can be generated during rotation, which helps the material to disperse and screen.

[0024] One end of the primary screening cylinder 7, away from the end plate 12, extends to the outside of the secondary screening cylinder 6. One end of the secondary screening cylinder 6, away from the end plate 12, extends to the outside of the tertiary screening cylinder 5. One end of the tertiary screening cylinder 5, away from the end plate 12, extends to the outside of the rotating cylinder 1. Discharge components are provided at the ends of the tertiary screening cylinder 5, secondary screening cylinder 6, and primary screening cylinder 7 away from the end plate 12. A receiving component is located below the discharge component. The rotating cylinder 1 is inclined on the base 13, with its higher end located on one side of the belt conveyor 2, causing the connecting pipe 10 and the feed pipe 8 to also be inclined, facilitating material discharge and allowing millet to slide from one side to the other. This inclined arrangement utilizes gravity-assisted feeding, allowing the material to flow naturally towards the discharge end within the cylinder. Simultaneously, the extended ends of each screening cylinder facilitate the separate discharge of graded material. Through this inclined conveying and unloading structure, graded discharge of material is achieved during transportation.

[0025] The feeding assembly includes a sealing plate 15, a feeding sleeve 16, and a feeding port 17. The sealing plate 15 is fixedly installed on the outer wall of the third-stage screening cylinder 5, the second-stage screening cylinder 6, and the first-stage screening cylinder 7 away from the end plate 12. The feeding sleeve 16 is open at one end. The feeding sleeve 16 is fixedly installed on the outside of the sealing plate 15. A limiting ring 18 is fixedly installed on the outer wall of the rotating cylinder 1. The open end of the feeding sleeve 16 is slidably disposed in the gap between the limiting ring 18 and the rotating cylinder 1. The outer wall of the feeding sleeve 16 is provided with feeding ports 17 at positions corresponding to the third-stage screening cylinder 5, the second-stage screening cylinder 6, the first-stage screening cylinder 7, and positions away from the rotating cylinder 1. The sealing plate 15 includes a first separating ring 1501, a second separating ring 1502, and a third separating ring 1503. The first separating ring 1501 is fitted onto the outer wall of the tertiary screening cylinder 5; the second separating ring 1502 is fitted onto the outer wall of the secondary screening cylinder 6; and the third separating ring 1503 is fitted onto the outer wall of the primary screening cylinder 7. The outer diameters of the first separating ring 1501, the second separating ring 1502, and the third separating ring 1503 are the same and they transition into the interior of the discharge sleeve 16. By separating the outlets of each screening cylinder through the sealing plate 15, and cooperating with the corresponding discharge port 17 on the discharge sleeve 16, it is possible to simultaneously discharge multiple stages of materials separately. Furthermore, the discharge sleeve 16 can rotate together with the rotating cylinder 1 to ensure continuous discharge.

[0026] The elastic element 11 includes springs 19 and a base plate 20. Several springs 19 are uniformly fixedly installed around the outer wall of the three-stage screening cylinder 5 along its axial direction. The base plate 20 is fixedly installed around the inner wall of the rotating cylinder 1. The ends of the springs 19 facing away from the three-stage screening cylinder 5 are fixedly connected to the base plate 20. The end of the base plate 20 facing away from the rotating cylinder 1 has a rounded corner. A sealing ring 22 is fixedly installed inside the rotating cylinder 1 near the end plate 12. The inner wall of the sealing ring 22 slides against the outer wall of the three-stage screening cylinder 5. This elastic element 11 structure allows the screening assembly 4 to float elastically along its axial direction within the rotating cylinder 1. The rounded corner design of the base plate 20 prevents material from accumulating on the base plate 20, and the sealing ring 22 prevents material from escaping from the rotating cylinder 1.

[0027] The material of spring 19 should be rust-resistant spring steel such as 65Mn or stainless steel to adapt to the humid and weakly acidic media that may exist in the millet processing environment, and to avoid elasticity decay or breakage due to rust. The two ends of spring 19 need to be reliably connected to the outer wall of the three-stage screening cylinder 5 and the bottom plate 20. The outer surface of spring 19 should be treated with anti-corrosion coating, and the springs 19 should be evenly distributed circumferentially between adjacent springs to ensure that the screening assembly 4 is subjected to uniform force during reciprocating motion and to avoid jamming or eccentric wear.

[0028] Mounting plates 27 are fixedly installed on both sides of the upper surface of the base 13. The height of the mounting plate 27 on the side closer to the feed pipe 8 is higher than that on the side away from the feed pipe 8. Circular guide rails 28 are fixedly installed on each mounting plate 27. Rotating rings 29 are fixedly installed on both sides of the outer wall of the rotating cylinder 1, and the rotating rings 29 rotatably engage with the circular guide rails 28. A drive motor 30 is fixedly installed in the middle of the upper surface of the base 13. A gear 31 is fixedly installed on the output shaft of the drive motor 30, and a gear ring 32 is fixedly installed on the outer wall of the rotating cylinder 1, meshing with the gear 31. A protective cover 33 is fixedly installed on the upper surface of the base 13, covering the rotating cylinder 1 and the circular guide rails 28. The entire rotating cylinder 1 is rotated via gear and gear ring transmission. The engagement of the circular guide rails 28 and the rotating rings 29 ensures the smoothness of rotation, and the protective cover 33 improves the safety of equipment operation.

[0029] The material receiving assembly includes four belt conveyors 3, each located below a different discharge port 17. The carrying capacity of each belt conveyor 3 is larger than the moving range of the discharge ports 17. It receives materials of different grades discharged from the four discharge ports 17, and its carrying capacity is large enough to ensure that materials accurately fall onto the belt conveyors 3 as the discharge ports move with the rotating drum 1, achieving continuous material collection without stopping the machine. By using multiple sets of belt conveyors to grade and continuously unload materials of different particle sizes, the integration of screening and conveying functions is achieved.

[0030] As an elevator, the belt conveyor 2 should meet the following requirements in terms of model and specifications: the width of the conveyor belt should be less than the width of the feed inlet 14; the conveyor belt should be made of food-grade PVC material and have anti-slip guards or partitions on the surface to prevent millet from rolling off during the lifting process; the drive motor power should be 1.5kW to 3kW and equipped with a frequency converter to achieve stepless speed regulation to adapt to different material flow requirements.

[0031] As a parallel conveyor, the belt feeder 3 should meet the following requirements: the conveyor belt width should match that of the belt feeder 2, and the conveying length should be set according to the arrangement spacing of the four discharge ports 17 and the receiving area, usually 2m to 4m; the conveyor belt should also be made of food-grade PVC material with a smooth surface to ensure that the millet is evenly spread on each belt feeder 3 and stably conveyed to the subsequent collection container; each belt feeder 3 should be independently equipped with a drive motor with a power of 0.75kW to 1.5kW, and an adjustable baffle should be set to ensure that the millet falling from the discharge port 17 falls accurately into the material receiving area of ​​the conveyor belt to avoid spillage.

[0032] Working principle: The millet to be screened is lifted to the feed inlet 14 by the belt conveyor 2, and then enters the feed pipe 8 through the feed inlet 14, and then enters the connecting pipe 10 through the feed pipe 8, and finally enters the first-stage screening cylinder 7. The drive motor 30 is started, and the drive motor 30 drives the gear 31 to rotate. The gear 31 drives the gear ring 32 to rotate through meshing. The gear ring 32 drives the rotating cylinder 1 to rotate smoothly on the circular guide rail 28.

[0033] Since the screening assembly 4 is installed inside the rotating cylinder 1 through the elastic element 11, and the end plate 12 is fixedly connected to the third-stage screening cylinder 5, the second-stage screening cylinder 6, and the first-stage screening cylinder 7, the rotating cylinder 1 drives the entire screening assembly 4 to rotate synchronously when it rotates, so that the millet is subjected to centrifugal force and friction force and rolls along the cylinder wall in the first-stage screening cylinder 7. At the same time, the rotating cylinder 1 drives the end plate 12 to rotate, and the support plate 25 and roller 26 on the end plate 12 rotate accordingly. The roller 26 rolls continuously on the surface of the hemispherical protrusion 24 on the fixed ring 23. When the roller 26 gradually climbs from the bottom side of the hemispherical protrusion 24 to the end of the hemispherical protrusion 24 away from the fixed ring 23, the roller 26 is pushed outward, and then drives the entire screening assembly 4 to generate axial displacement in the direction of the feeding assembly (i.e., the side of the belt feeder 3) through the end plate 12. At this time, the spring 19 is compressed and stores energy under the support of the bottom plate 20. When the roller 26 passes the highest point of the hemispherical protrusion 24 and slides to the bottom side of the next hemispherical protrusion 24, the spring 19 restores its deformation and pushes the screening assembly 4 and the end plate 12 to return to their original positions quickly. Thus, during the continuous rotation of the rotating drum 1, the screening component 4 continuously generates axial reciprocating vibration, forming a composite screening motion of rotational motion and axial vibration, which enables the millet to be fully dispersed, layered and accelerated through screening in each screening drum, effectively avoiding material accumulation and screen hole blockage.

[0034] The material is first pre-screened in the primary screening cylinder 7. Broken rice and fine particles smaller than the screen holes of the primary screening cylinder 7 pass through the screen holes and enter the annular cavity between the primary screening cylinder 7 and the secondary screening cylinder 6. The material is then screened again in the secondary screening cylinder 6. Particles smaller than the screen holes of the secondary screening cylinder 6 enter the annular cavity between the secondary screening cylinder 6 and the tertiary screening cylinder 5. After being screened by the tertiary screening cylinder 5, fine powder and extremely small broken rice smaller than the screen holes of the tertiary screening cylinder 5 enter the annular cavity between the tertiary screening cylinder 5 and the rotating cylinder 1. The material larger than the screen holes of the tertiary screening cylinder 5 is retained inside the tertiary screening cylinder 5 and continues to be pushed towards the discharge end. Finally, the largest particle size material remaining inside the primary screening cylinder 7, the second largest particle size material between the primary screening cylinder 7 and the secondary screening cylinder 6, the smaller particle size material between the secondary screening cylinder 6 and the tertiary screening cylinder 5, and the smallest particle size material (including fine powder) between the tertiary screening cylinder 5 and the rotating cylinder 1 move axially along their respective cylinders or cavities, reach the discharge assembly, and are discharged through the four discharge ports 17 corresponding to the discharge sleeve 16, and accurately fall onto their respective corresponding belt conveyors 3, which transport them to different collection areas. This achieves multi-level continuous grading and separate collection of millet. Throughout the process, the belt conveyor 2 continuously supplies material, each discharge port 17 continuously discharges material, and the belt conveyor 3 synchronously collects material, completing the entire automatic conveying operation from loading, screening to unloading without stopping the machine.

[0035] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A lifting and screening machine for processing millet, comprising a rotating drum (1), a belt conveyor (2), and a receiving assembly; the rotating drum (1) is rotatably mounted on a base (13); characterized in that, The rotating cylinder (1) is equipped with a screening assembly (4) through an elastic element (11). The screening assembly (4) includes a three-stage screening cylinder (5), a two-stage screening cylinder (6), and a first-stage screening cylinder (7). The first-stage screening cylinder (7) is fixedly installed inside the two-stage screening cylinder (6), and the two-stage screening cylinder (6) is fixedly installed inside the three-stage screening cylinder (5). The sieve holes on the three-stage sieve cylinder (5), the two-stage sieve cylinder (6) and the one-stage sieve cylinder (7) are progressively larger; one end of the three-stage sieve cylinder (5), the two-stage sieve cylinder (6) and the one-stage sieve cylinder (7) are aligned and fixedly installed with end plates (12); a feed pipe (8) is fixedly installed on the side wall of the base (13) through a support frame (9); a feed port (14) is opened on the feed pipe (8); a connecting pipe (10) is fitted at the end of the feed pipe (8); and the connecting pipe (10) is connected to the inside of the one-stage sieve cylinder (7). A fixing ring (23) is fixedly installed on the outer wall of the feed pipe (8). Multiple hemispherical protrusions (24) are evenly fixedly installed on the fixing ring (23) around the axis of the feed pipe (8). Multiple support plates (25) are evenly fixedly installed on the side wall of the end plate (12) around the axis of the connecting pipe (10). Rollers (26) are rotatably installed at the ends of the support plates (25). The number of rollers (26) is the same as that of the hemispherical protrusions (24) and they abut against each other. The three-stage screening cylinder (5), the two-stage screening cylinder (6) and the one-stage screening cylinder (7) are provided with a feeding component at one end away from the end plate (12), and the receiving component is located below the feeding component; the rotating cylinder (1) is inclinedly set on the base (13), and the higher end of the rotating cylinder (1) is located on one side of the belt feeder (2).

2. The millet lifting and screening machine for processing millet according to claim 1, characterized in that: The feeding assembly includes a sealing plate (15), a feeding sleeve (16), and a feeding port (17); the rotating cylinder (1), the three-stage screening cylinder (5), the two-stage screening cylinder (6), and the one-stage screening cylinder (7) are coaxially arranged; the sealing plate (15) is fixedly installed on the outer wall of the three-stage screening cylinder (5), the two-stage screening cylinder (6), and the one-stage screening cylinder (7) away from the end plate (12); the feeding sleeve (16) is open at one end; the feeding sleeve (16) is fixedly installed on the outside of the sealing plate (15), and a limiting ring (18) is fixedly installed on the outer wall of the rotating cylinder (1), and the open end of the feeding sleeve (16) is slidably arranged in the gap between the limiting ring (18) and the rotating cylinder (1); the outer wall of the feeding sleeve (16) is provided with feeding ports (17) at positions corresponding to the three-stage screening cylinder (5), the two-stage screening cylinder (6), the one-stage screening cylinder (7), and positions away from the rotating cylinder (1).

3. The millet lifting and screening machine for processing millet according to claim 2, characterized in that: The sealing plate (15) includes a first separating ring (1501), a second separating ring (1502), and a third separating ring (1503); the first separating ring (1501) is fitted on the outer wall of the third-stage screening cylinder (5); the second separating ring (1502) is fitted on the outer wall of the second-stage screening cylinder (6); and the third separating ring (1503) is fitted on the outer wall of the first-stage screening cylinder (7); the outer diameters of the first separating ring (1501), the second separating ring (1502), and the third separating ring (1503) are the same and are in transition fit with the inside of the feeding sleeve (16).

4. The millet lifting and screening machine for processing millet according to claim 1, characterized in that: The elastic element (11) includes a spring (19) and a base plate (20); several springs (19) are uniformly fixedly installed around the outer wall of the three-stage screening cylinder (5) along the axial direction of the three-stage screening cylinder (5), and a base plate (20) is fixedly installed around the inner wall of the rotating cylinder (1). The ends of the springs (19) away from the three-stage screening cylinder (5) are fixedly connected to the base plate (20); the end of the base plate (20) away from the rotating cylinder (1) is provided with an arc angle.

5. The millet lifting and screening machine for processing millet according to claim 1, characterized in that: The three-stage screening cylinder (5) and the two-stage screening cylinder (6), as well as the two-stage screening cylinder (6) and the one-stage screening cylinder (7), are fixedly connected by an assembly rod (21).

6. The lifting and screening machine for processing millet according to claim 1, characterized in that: A sealing ring (22) is fixedly installed at one end of the rotating cylinder (1) near the end plate (12), and the inner wall of the sealing ring (22) slides in conjunction with the outer wall of the three-stage screening cylinder (5).

7. The lifting and screening machine for processing millet according to claim 1, characterized in that: The discharge port of the belt feeder (2) is located above the feed port (14); the end of the primary screening cylinder (7) away from the end plate (12) extends to the outside of the secondary screening cylinder (6), the end of the secondary screening cylinder (6) away from the end plate (12) extends to the outside of the tertiary screening cylinder (5), and the end of the tertiary screening cylinder (5) away from the end plate (12) extends to the outside of the rotating cylinder (1).

8. The millet lifting and screening machine for processing millet according to claim 1, characterized in that: Mounting plates (27) are fixedly installed on both sides of the upper end face of the base (13). The height of the mounting plate (27) on the side closer to the feed pipe (8) is higher than the height of the mounting plate (27) on the side away from the feed pipe (8). Circular guide rails (28) are fixedly installed on the mounting plates (27). Rotating rings (29) are fixedly installed on both sides of the outer wall of the rotating cylinder (1). The rotating rings (29) and the circular guide rails (28) rotate in cooperation. A drive motor (30) is fixedly installed in the middle of the upper end face of the base (13). A gear (31) is fixedly installed on the output shaft of the drive motor (30). A gear ring (32) is fixedly installed on the outer wall of the rotating cylinder (1). The gear (31) and the gear ring (32) mesh with each other.

9. A lifting and screening machine for processing millet according to claim 8, characterized in that: A protective cover (33) is fixedly installed on the upper surface of the base (13), and the protective cover (33) covers the outside of the rotating cylinder (1) and the circular guide rail (28).

10. A lifting and screening machine for processing millet according to claim 1, characterized in that: The receiving assembly includes four belt feeders (3), which are located below the four discharge ports (17). The material carrying range of the belt feeders (3) is greater than the moving range of the discharge ports (17).

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