Self-cleaning anti-blocking screening machine for feed

Abstract

The self-cleaning anti-blocking screening machine comprises an outer barrel and a screening barrel, a plurality of guide scraping plates are arranged on the inner side and the outer side of the bottom end of the screening barrel, the guide scraping plates are attached to the inner wall and the outer wall of the screening barrel, an air guide cover is arranged on the outer side of the screening barrel and wraps the area, except the guide scraping plates, of the outer side of the screening barrel, and an air inlet pipe communicated with the air guide cover is arranged on the outer barrel. The wind scooper is configured to introduce airflow into the screen drum. The guide scraping plate is located at the bottom end all the time and can scrape feed impurities attached to the inner / outer wall of the screen drum, impurity accumulation or long-time covering is avoided, in addition, the wind scooper can guide airflow to the screen drum, pressure difference is formed between the inner side and the outer side of the screen drum by controlling on-off of valves on the discharging pipe and the air inlet pipe, and the feed can be discharged out of the screen drum by means of the pressure difference formed between the inner side and the outer side of the screen drum. The air flow is promoted to flow, impact force is increased, impurities in sieve holes are removed, the sieve holes are dredged, the self-cleaning effect of the screening machine is achieved, and the grading effect of pellet feed and the service life of the screening machine are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of feed screening technology, and more specifically to a self-cleaning, anti-clogging feed screening machine. Background Technology

[0002] Pelleted pig feed is a powdered complete feed composed of various energy feeds, protein feeds, minerals, vitamins, amino acids, and additives. It is produced as cylindrical pellets through steam conditioning and high-temperature, high-pressure pressing. During feed pellet production, factors such as differences in raw materials and fluctuations in pelleting processes often result in pellets of varying sizes. Grading and screening can effectively separate these pellets of different sizes, thereby improving feed quality and farming efficiency.

[0003] Pelleted feed raw materials contain fibers, impurities, or powder. Fibers easily become entangled in the screen mesh, while impurities and powder fill the pores, causing blockages. Furthermore, improper temperature and pressure control during the pelleting process can lead to uneven pellet texture; excessively hard or sticky pellets cannot pass through the screen and easily become stuck in the mesh. This blockage results in a mixture of large and small pellets, making accurate grading impossible and failing to meet the nutritional requirements of pigs at different growth stages. Moreover, long-term blockages can increase the load on equipment, causing motor overheating, screen damage, shortening equipment lifespan, and affecting the continuity and stability of subsequent production. Summary of the Invention

[0004] This invention proposes a self-cleaning, anti-clogging feed screening machine, comprising:

[0005] The outer cylinder has a feed pipe at one end and a discharge pipe at the other end.

[0006] The sieve cylinder is driven to rotate and is disposed inside the outer cylinder;

[0007] The screen cylinder has multiple guide scrapers on its inner and outer sides at the bottom end. The guide scrapers are attached to the inner and outer walls of the screen cylinder. The outer side of the screen cylinder is provided with an air guide hood that covers the area outside the screen cylinder except for the guide scrapers. The outer cylinder is provided with an air inlet pipe that communicates with the air guide hood. The air guide hood is configured to introduce airflow into the screen cylinder.

[0008] Preferably, valves are provided on the feed pipe, discharge pipe and air inlet pipe. The discharge pipe is connected to an external negative pressure suction device and the air inlet pipe is connected to an external air supply device. By controlling the opening and closing of the valves on the discharge pipe and air inlet pipe, a pressure difference is formed between the inner and outer sides of the screen cylinder.

[0009] Preferably, the guide scraper includes a scraper body and a connecting rod. The scraper body is constructed as a fan-shaped arc plate, and each scraper body is arranged at a set spiral angle around the axis of the screen cylinder to guide the material in the screen cylinder from the feed pipe to the discharge pipe. The connecting rod is fixed inside the outer cylinder and is parallel to the axial direction of the screen cylinder. The connecting rod passes through multiple scraper bodies and is fixedly connected to the scraper bodies.

[0010] Preferably, the air guide shroud is constructed as a hollow arc-shaped plate, and the outer side of the screen cylinder slides against the inner side of the air guide shroud. The inner side of the air guide shroud is provided with multiple parallel air guide grooves, which are centrally symmetrically distributed around the central axis of the air guide shroud. All the air guide grooves are parallel to the central axis of the air guide shroud. The air guide grooves communicate with the cavity inside the air guide shroud and can guide airflow to the surface of the screen cylinder.

[0011] Preferably, the sieve cylinder includes a first sieve cylinder, a second sieve cylinder, and a transmission ring coaxially distributed. The second sieve cylinder is disposed outside the first sieve cylinder, and the transmission ring is disposed at the ends of the first and second sieve cylinders. The outer cylinder is provided with a driver for driving the sieve cylinder. The driver includes a drive roller and a motor. There are three or more drive rollers. The drive rollers are centrally symmetrically disposed inside the transmission ring and are connected to the transmission ring for transmission. One of the drive rollers is connected to the output end of the motor and can be driven to rotate by the motor.

[0012] Preferably, the guide scraper includes a first guide scraper, a second guide scraper, and a third guide scraper. The first guide scraper is disposed at the inner bottom end of the first screen cylinder, the second guide scraper is disposed between the first screen cylinder and the transmission ring, and the second guide scraper slides against the outer wall of the first screen cylinder and the inner wall of the second screen cylinder respectively, and the third guide scraper is disposed at the outer bottom end of the second screen cylinder.

[0013] Preferably, the air guide shroud includes a first air guide shroud and a second air guide shroud. The first air guide shroud covers the outside of the first screen cylinder, and the two ends of the first air guide shroud are located on both sides of the second guide scraper. The second air guide shroud covers the outside of the second screen cylinder, and the two ends of the second air guide shroud are located on both sides of the third guide scraper.

[0014] Preferably, the air inlet pipe includes a first air inlet pipe and a second air inlet pipe, the first air inlet pipe is connected to the second air guide hood, and the second air inlet pipe is connected to the first air guide hood. The discharge pipe includes a first discharge pipe, a second discharge pipe and a third discharge pipe, the first discharge pipe is located at the middle of the inner bottom end of the first screen cylinder, the second discharge pipe is located at the middle of the inner bottom end of the second screen cylinder, and the third discharge pipe is located at the middle of the inner bottom end of the outer cylinder.

[0015] Preferably, both the first sieve cylinder and the second sieve cylinder include a first cylinder plate and a second cylinder plate. The second cylinder plate is fixedly disposed on the outside of the first cylinder plate. The first cylinder plate has a plurality of first sieve holes. The second cylinder plate has second sieve holes corresponding to the first sieve holes. The first sieve holes and the second sieve holes overlap to form sieve holes. The second cylinder plate has an elastic protrusion that protrudes into the second sieve holes. The elastic protrusion can move elastically relative to the first cylinder plate.

[0016] Preferably, the elastic protrusion is constructed as a fan-shaped elastic block, and there are two or more elastic protrusions. A deformation slit is provided between any two adjacent elastic protrusions, and the area of ​​the elastic protrusion is 1 / 10 of the area of ​​the first sieve hole.

[0017] Compared with the prior art, the advantages of the present invention are as follows:

[0018] This invention features guide scrapers installed on the inner and outer sides of the bottom of the screen cylinder, along with an air guide hood on the outer side. The guide scrapers are always positioned at the bottom and can scrape off feed impurities adhering to the inner / outer walls of the screen cylinder, preventing impurities from accumulating or covering for extended periods. Additionally, the air guide hood directs airflow into the screen cylinder. By controlling the opening and closing of valves on the discharge pipe and air inlet pipe, a pressure difference is created between the inner and outer sides of the screen cylinder. This pressure difference promotes airflow and increases impact force, removing impurities from the screen holes. This process unblocks the screen holes, achieving a self-cleaning effect for the screening machine, ensuring the grading effect of pelleted feed, and extending the service life of the screening machine. Attached Figure Description

[0019] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a self-cleaning and anti-clogging feed screening machine according to an embodiment of the present invention;

[0021] Figure 2This is a schematic diagram of the internal structure of a self-cleaning and anti-clogging feed screening machine according to an embodiment of the present invention;

[0022] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0023] Figure 4 yes Figure 2 Schematic diagram of the cross-sectional structure along the BB direction;

[0024] Figure 5 yes Figure 2 Schematic diagram of the cross-sectional structure along the CC direction;

[0025] Figure 6 This is a partially enlarged structural diagram of the sieve holes on the sieve cylinder shown in an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the cross-sectional view of the sieve holes on the sieve cylinder shown in an embodiment of the present invention;

[0027] 10. Outer cylinder; 11. Feed pipe; 12. Discharge pipe; 121. First discharge pipe; 122. Second discharge pipe; 123. Third discharge pipe; 13. Air inlet pipe; 131. First air inlet pipe; 132. Second air inlet pipe; 133. Third air inlet pipe; 14. Frame; 20. Screen cylinder; 200. Screen holes; 201. First screen hole; 202. Second screen hole; 2a. First cylinder plate; 2b. Second cylinder plate Plate; 2b1, elastic protrusion; 2b11, deformation joint; 21, first screen cylinder; 22, second screen cylinder; 23, transmission ring; 30, driver; 31, drive roller; 32, motor; 40, air guide shroud; 41, first air guide shroud; 42, second air guide shroud; 50, guide scraper; 501, scraper body; 502, connecting rod; 51, first guide scraper; 52, second guide scraper; 53, third guide scraper. Detailed Implementation

[0028] To better understand the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

[0029] Because current methods of screening granular pig feed can lead to issues such as screen blockage affecting feed grading quality and the lifespan of the screening machine, this invention provides a self-cleaning, anti-blockage screening machine for feed. The device mainly includes an outer cylinder 10, a screen cylinder 20, and a driver 30.

[0030] like Figure 1 and Figure 2As shown, the outer cylinder 10 is constructed as a cylindrical structure, with a frame 14 installed at the bottom of the outer side to maintain the stability of the outer cylinder 10. The screen cylinder 20 is driven by the driver 30 and is rotatably installed inside the outer cylinder 10. The screen cylinder 20 has uniformly distributed screen holes 200. The rotation of the screen cylinder 20 inside the outer cylinder 10 is used to screen the pellet feed.

[0031] Furthermore, one end of the outer cylinder 10 is provided with a feed pipe 11 and the other end is provided with a discharge pipe 12. Multiple guide scrapers 50 are provided on the inner and outer sides of the bottom end of the screen cylinder 20. The guide scrapers 50 are attached to the inner / outer wall of the screen cylinder 20. An air guide hood 40 is provided on the outer side of the screen cylinder 20. The air guide hood 40 covers the area outside the screen cylinder 20 except for the guide scrapers 50. An air inlet pipe 13 is provided on the outer cylinder 10 and communicates with the air guide hood 40. The air guide hood 40 is configured to introduce airflow into the screen cylinder 20.

[0032] In some embodiments, the feed pipe 11 is constructed as an "S"-shaped or "L"-shaped curved pipe. The feed end of the feed pipe 11 is connected to a feed supply device (e.g., a screw feeder) to receive unscreened pellet feed. The discharge end of the feed pipe 11 is fixed at the middle position of the end face of the outer cylinder 10 and extends inward into the screen cylinder 20, so that the feed pipe 11 and the screen cylinder 20 are on the same axis, allowing the screen cylinder 20 to rotate outside the feed pipe 11. Pellet feed is supplied to the screen cylinder 20 as needed from the feed pipe 11, and the continuous or intermittent rotation of the screen cylinder 20 screens and grades the pellet feed.

[0033] The guide scraper 50 at the bottom of the screen cylinder 20 is fixed relative to the screen cylinder 20. When the screen cylinder 20 rotates, the guide scraper 50 is always at the bottom position and can scrape off the feed impurities attached to the inner / outer wall of the screen cylinder 20, avoiding the accumulation of impurities or long-term coverage. In addition, the air guide hood 40 can guide airflow to the screen cylinder 20, and use the airflow to remove impurities in the screen holes 200, thereby clearing the screen holes 200, realizing the self-cleaning effect of the screening machine, ensuring the grading effect of pellet feed and the service life of the screening machine.

[0034] Furthermore, valves are provided on the feed pipe 11, the discharge pipe 12, and the air inlet pipe 13. The discharge pipe 12 is connected to an external negative pressure suction device, and the air inlet pipe 13 is connected to an external air supply device. By controlling the opening and closing of the valves on the discharge pipe 12 and the air inlet pipe 13, a pressure difference is formed between the inner and outer sides of the screen cylinder 20. The pressure difference formed between the inner and outer sides of the screen cylinder 20 promotes airflow and increases the impact force, thereby removing impurities from the screen holes 200.

[0035] In some embodiments, under normal conditions, the valves on the feed pipe 11, discharge pipe 12, and air inlet pipe 13 are all in the open state. In this state, the pellet feed is fed into the screen cylinder 20 at a set speed. The air inlet pipe 13 guides hot airflow into the screen cylinder 20 through the air guide hood 40. The hot airflow dries the pellet feed to prevent the feed in a humid and hot state from easily adhering to the screen cylinder 20. The discharge pipe 12 normally discharges the graded pellet feed. The valves on the feed pipe 11, discharge pipe 12, and air inlet pipe 13 can be solenoid valves. By connecting the solenoid valves to the control circuit, the valves can be controlled to periodically execute the opening and closing program, or to execute according to feedback.

[0036] Upon receiving the execution signal, the valves on the air inlet pipe 13 and the feed pipe 11 are first closed. The feed inside the outer cylinder 10 is drawn in by the external negative pressure device, and the inside of the outer cylinder 10 is in a negative pressure state. Then, the valve on the air inlet pipe 13 is opened, and the airflow from the air guide hood 40 is guided to the air inlet pipe 13 after passing through the screen cylinder 20. This increases the pressure difference on both sides of the screen cylinder 20, causing the airflow to pass through the screen holes 200 and thus removing impurities from the screen holes 200. Then, the valve on the feed pipe 11 is opened, and the normal working process begins.

[0037] like Figure 3 and Figure 5 As shown, the guide scraper 50 includes a scraper body 501 and a connecting rod 502. The scraper body 501 is constructed as a fan-shaped arc plate, and each scraper body 501 is arranged at a set spiral angle around the axis of the screen cylinder 20, which is used to guide the material in the screen cylinder 20 from the feed pipe 11 to the discharge pipe 12. The connecting rod 502 is fixed inside the outer cylinder 10, and the connecting rod 502 is parallel to the axial direction of the screen cylinder 20. The connecting rod 502 passes through multiple scraper bodies 501 and is fixedly connected to the scraper bodies 501.

[0038] Furthermore, the projection areas of multiple scraper bodies 501 in the axial direction overlap and cover the entire screen cylinder 20. Thus, when the screen cylinder 20 rotates, its entire length can be scraped by multiple scraper bodies 501. From the feed pipe 11 to the discharge pipe 12, the pellet feed will pass through multiple scraper bodies 501 in sequence, causing the pellet feed to undergo multiple screenings. This ensures that the pellet feed discharged from the discharge pipe 12 has undergone multiple gradings, avoiding the mixing of ungraded pellets and achieving good grading effect. The connecting rod 502 is mainly used to keep the position of multiple scraper bodies 501 fixed, so that the scraper bodies 501 can always perform scraping and guiding work on the surface of the screen cylinder 20.

[0039] Furthermore, the air guide shroud 40 is constructed as a hollow arc-shaped plate, and the outer side of the screen cylinder 20 slides against the inner side of the air guide shroud 40.

[0040] The inner side of the air guide shroud 40 is provided with multiple parallel air guide grooves. The multiple air guide grooves are centrally symmetrically distributed around the central axis of the air guide shroud 40, and all the air guide grooves are parallel to the central axis of the air guide shroud 40. The air guide grooves are connected to the cavity inside the air guide shroud 40 and can guide airflow to the surface of the screen cylinder 20.

[0041] In a specific embodiment, the distance between any two adjacent air guide grooves is equal to the distribution spacing of the screen holes 200 on the screen cylinder 20, and the distance between the screen holes 200 is greater than the aperture of the screen holes 200. Thus, when the screen cylinder 20 rotates cyclically inside the air guide hood 40, the air guide grooves cyclically contact the screen holes 200 and the areas between the screen holes 200. When the air guide groove corresponds to the area between the screen holes 200, the gas continuously released in the air guide groove is compressed, and the pressure increases. Subsequently, the air guide groove corresponds to the area of ​​the screen hole 200, guiding the airflow to the screen hole 200. The airflow will enter the screen cylinder 20 from the screen hole 200, cleaning the screen holes 200 in the process. At the same time, the airflow can dry the pellet feed in the screen cylinder 20, preventing the pellet feed from adhering to the screen cylinder 20 due to moisture and heat. While cleaning the screen holes 200, the occurrence of blockage is reduced.

[0042] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments, the screen cylinder 20 includes a first screen cylinder 21, a second screen cylinder 22, and a transmission ring 23 coaxially distributed. The second screen cylinder 22 is disposed outside the first screen cylinder 21. The first screen cylinder 21 and the second screen cylinder 22 are used to complete the three-stage grading of the pellet feed. The excessively large feed particles are retained inside the first screen cylinder 21, the medium-sized feed particles are retained inside the second screen cylinder 22, and the loose feed particles fall into the outer cylinder 10, thereby realizing the three-stage sieving of the pellet feed.

[0043] Furthermore, the transmission ring 23 is disposed at the end of the first screen cylinder 21 and the second screen cylinder 22. The first screen cylinder 21 and the second screen cylinder 22 are both provided with screen holes 200, while the transmission ring 23 is not provided with screen holes 200. The outer cylinder 10 is provided with a driver 30 for driving the screen cylinder 20.

[0044] The driver 30 includes a drive roller 31 and a motor 32. There are three or more drive rollers 31. In order to improve the stability of the transmission ring 23 when it rotates and to avoid excessive friction during the driving process, the drive rollers 31 are generally set to three to six. In the figure, there are six drive rollers 31. The multiple drive rollers 31 are centrally symmetrically arranged on the inner side of the transmission ring 23 and are connected to the transmission ring 23. One of the drive rollers 31 is connected to the output end of the motor 32 and can be driven to rotate by the motor 32.

[0045] According to the first screen cylinder 21 and the second screen cylinder 22 described above, the corresponding guide scraper 50 includes a first guide scraper 51, a second guide scraper 52 and a third guide scraper 53. The first guide scraper 51 is disposed at the inner bottom end of the first screen cylinder 21, the second guide scraper 52 is disposed between the first screen cylinder 21 and the transmission ring 23, and the second guide scraper 52 slides against the outer wall of the first screen cylinder 21 and the inner wall of the second screen cylinder 22 respectively. The third guide scraper 53 is disposed at the outer bottom end of the second screen cylinder 22. In this way, when the first screen cylinder 21 and the second screen cylinder 22 rotate synchronously, the inner and outer walls of the first screen cylinder 21 and the second screen cylinder 22 will be scraped by the first guide scraper 51, the second guide scraper 52 and the third guide scraper 53 to remove impurities from the surface, thereby achieving a self-cleaning effect.

[0046] Furthermore, the air guide shroud 40 includes a first air guide shroud 41 and a second air guide shroud 42. The first air guide shroud 41 covers the outside of the first screen cylinder 21, and the two ends of the first air guide shroud 41 are located on both sides of the second guide scraper 52. The second air guide shroud 42 covers the outside of the second screen cylinder 22, and the two ends of the second air guide shroud 42 are located on both sides of the third guide scraper 53.

[0047] The air inlet pipe 13 includes a first air inlet pipe 131 and a second air inlet pipe 132. The first air inlet pipe 131 is connected to the second air guide hood 42, and the second air inlet pipe 132 is connected to the first air guide hood 41. That is, the first air guide hood 41 and the second air guide hood 42 correspond to the outer covering areas of the first screen cylinder 21 and the second screen cylinder 22, and can guide air into the screen cylinder 20 to facilitate the airflow to contact the granular material for drying, and to facilitate the granular feed to be screened out in the direction of the guide scraper 50. At the same time, the airflow is used to clean the screen holes 200.

[0048] The discharge pipe 12 includes a first discharge pipe 121, a second discharge pipe 122, and a third discharge pipe 123. The first discharge pipe 121 is located at the middle of the bottom inner side of the first screen cylinder 21, and the graded granular material in the first screen cylinder 21 can be drawn out through the first discharge pipe 121. The second discharge pipe 122 is located at the middle of the bottom inner side of the second screen cylinder 22, and the graded granular material in the second screen cylinder 22 can be drawn out through the second discharge pipe 122. The third discharge pipe 123 is located at the middle of the bottom inner side of the outer cylinder 10, and the graded granular material in the outer cylinder 10 can be drawn out through the third discharge pipe 123.

[0049] like Figure 2 As shown, in order to ensure that no material remains in the outer cylinder 10, a third air inlet pipe 133 is provided on the outer cylinder 10 at a position opposite to the third discharge pipe 123. The third air inlet pipe 133 is connected to an external air supply device and can blow air into the outer cylinder 10. Together with the third air inlet pipe 133, the pellet feed in the outer cylinder 10 is discharged.

[0050] like Figure 6 and Figure 7 As shown, both the first screen cylinder 21 and the second screen cylinder 22 include a first cylinder plate 2a and a second cylinder plate 2b. The second cylinder plate 2b is fixedly disposed on the outside of the first cylinder plate 2a. In some embodiments, the first cylinder plate 2a is made of a rigid material, such as a stainless steel cylinder, and the second cylinder plate 2b is made of an elastic material, such as a plastic cylinder. After the first cylinder plate 2a and the second cylinder plate 2b are assembled together, the cylinder wall forms a cylinder with an inner metal layer and an outer plastic layer.

[0051] Furthermore, the first cylindrical plate 2a has a plurality of first screen holes 201, and the second cylindrical plate 2b has second screen holes 202 corresponding to the first screen holes 201. The first screen holes 201 and the second screen holes 202 overlap to form screen holes 200. The second cylindrical plate 2b has an elastic protrusion 2b1 protruding into the second screen hole 202. The elastic protrusion 2b1 can move elastically relative to the first cylindrical plate 2a. In this way, when the airflow impacts the adhering or residual feed in the screen hole 200, the elastic protrusion 2b1 is more likely to deform elastically. After the elastic protrusion 2b1 is deformed, the residue in the screen hole 200 is more likely to be washed away by the airflow.

[0052] Furthermore, to make the elastic protrusion 2b1 more easily deformable under pressure, the elastic protrusion 2b1 is constructed as a fan-shaped elastic block, and there are two or more elastic protrusions 2b1. A deformation slit 2b11 is provided between any two adjacent elastic protrusions 2b1. In this way, the elastic protrusion 2b1 can deform at the deformation slit 2b11, thereby expanding the area of ​​the sieve hole 200 and promoting the discharge of internal impurities. The area of ​​the elastic protrusion 2b1 is 1 / 10 of the area of ​​the first sieve hole 201, thus avoiding large changes in the sieve hole 200.

[0053] In conjunction with the above embodiments, by setting guide scrapers 50 on the inner and outer sides of the bottom end of the screen cylinder 20, and simultaneously setting an air guide hood 40 on the outer side, the guide scrapers 50 are always at the bottom position and can scrape off feed impurities attached to the inner / outer wall of the screen cylinder 20, avoiding the accumulation or long-term coverage of impurities. In addition, the air guide hood 40 can guide airflow to the screen cylinder 20. By controlling the opening and closing of the valves on the discharge pipe 12 and the air inlet pipe 13, a pressure difference is formed between the inner and outer sides of the screen cylinder 20. The pressure difference formed between the inner and outer sides of the screen cylinder 20 promotes airflow and increases the impact force, removing impurities in the screen holes 200, thus clearing the screen holes 200, achieving the self-cleaning effect of the screening machine, ensuring the grading effect of pellet feed and the service life of the screening machine.

[0054] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A self-cleaning, anti-clogging feed screening machine, characterized in that, include: The outer cylinder (10) has a feed pipe (11) at one end and a discharge pipe (12) at the other end. The sieve cylinder (20) is driven to rotate inside the outer cylinder (10); The bottom inner and outer sides of the screen cylinder (20) are provided with a plurality of guide scrapers (50), which are attached to the inner and outer walls of the screen cylinder (20). The outer side of the screen cylinder (20) is provided with an air guide hood (40), which covers the area outside the screen cylinder (20) except for the guide scrapers (50). The outer cylinder (10) is provided with an air inlet pipe (13) that communicates with the air guide hood (40). The air guide hood (40) is configured to introduce airflow into the screen cylinder (20).

2. The self-cleaning, anti-clogging feed screening machine according to claim 1, characterized in that, Valves are provided on the feed pipe (11), discharge pipe (12) and air inlet pipe (13). The discharge pipe (12) is connected to an external negative pressure suction device, and the air inlet pipe (13) is connected to an external air supply device. By controlling the opening and closing of the valves on the discharge pipe (12) and air inlet pipe (13), a pressure difference is formed between the inner and outer sides of the screen cylinder (20).

3. The self-cleaning, anti-clogging feed screening machine according to claim 1, characterized in that, The guide scraper (50) includes a scraper body (501) and a connecting rod (502). The scraper body (501) is constructed as a fan-shaped arc plate, and each scraper body (501) is arranged at a set spiral angle around the axis of the screen cylinder (20) to guide the material in the screen cylinder (20) from the feed pipe (11) to the discharge pipe (12). The connecting rod (502) is fixed inside the outer cylinder (10) and is parallel to the axial direction of the screen cylinder (20). The connecting rod (502) passes through multiple scraper bodies (501) and is fixedly connected to the scraper bodies (501).

4. The self-cleaning, anti-clogging feed screening machine according to claim 1, characterized in that, The air guide hood (40) is constructed as a hollow arc-shaped plate. The outer side of the screen cylinder (20) slides against the inner side of the air guide hood (40). The inner side of the air guide hood (40) is provided with multiple parallel air guide grooves. The multiple air guide grooves are centrally symmetrically distributed around the central axis of the air guide hood (40), and all the air guide grooves are parallel to the central axis of the air guide hood (40). The air guide grooves are connected to the cavity inside the air guide hood (40) and can guide airflow to the surface of the screen cylinder (20).

5. A self-cleaning, anti-clogging feed screening machine according to any one of claims 1-4, characterized in that, The sieve cylinder (20) includes a first sieve cylinder (21), a second sieve cylinder (22), and a transmission ring (23) coaxially distributed. The second sieve cylinder (22) is located outside the first sieve cylinder (21), and the transmission ring (23) is located at the ends of the first sieve cylinder (21) and the second sieve cylinder (22). The outer cylinder (10) is provided with a driver (30) for driving the sieve cylinder (20). The driver (30) includes a drive roller (31) and a motor (32). There are three or more drive rollers (31). Multiple drive rollers (31) are centrally symmetrically arranged inside the transmission ring (23) and are connected to the transmission ring (23) for transmission. One of the drive rollers (31) is connected to the output end of the motor (32) and can be driven to rotate by the motor (32).

6. A self-cleaning, anti-clogging feed screening machine according to claim 5, characterized in that, The guide scraper (50) includes a first guide scraper (51), a second guide scraper (52) and a third guide scraper (53). The first guide scraper (51) is disposed at the inner bottom end of the first screen cylinder (21). The second guide scraper (52) is disposed between the first screen cylinder (21) and the transmission ring (23). The second guide scraper (52) slides against the outer wall of the first screen cylinder (21) and the inner wall of the second screen cylinder (22) respectively. The third guide scraper (53) is disposed at the outer bottom end of the second screen cylinder (22).

7. A self-cleaning, anti-clogging feed screening machine according to claim 6, characterized in that, The air guide shroud (40) includes a first air guide shroud (41) and a second air guide shroud (42). The first air guide shroud (41) covers the outside of the first screen cylinder (21), and the two ends of the first air guide shroud (41) are located on both sides of the second guide scraper (52). The second air guide shroud (42) covers the outside of the second screen cylinder (22), and the two ends of the second air guide shroud (42) are located on both sides of the third guide scraper (53).

8. A self-cleaning, anti-clogging feed screening machine according to claim 7, characterized in that, The air inlet pipe (13) includes a first air inlet pipe (131) and a second air inlet pipe (132). The first air inlet pipe (131) is connected to the second air guide hood (42), and the second air inlet pipe (132) is connected to the first air guide hood (41). The discharge pipe (12) includes a first discharge pipe (121), a second discharge pipe (122), and a third discharge pipe (123). The first discharge pipe (121) is located at the middle of the inner bottom end of the first screen cylinder (21). The second discharge pipe (122) is located at the middle of the inner bottom end of the second screen cylinder (22). The third discharge pipe (123) is located at the middle of the inner bottom end of the outer cylinder (10).

9. A self-cleaning, anti-clogging feed screening machine according to claim 5, characterized in that, The first sieve cylinder (21) and the second sieve cylinder (22) both include a first cylinder plate (2a) and a second cylinder plate (2b). The second cylinder plate (2b) is fixedly disposed on the outside of the first cylinder plate (2a). The first cylinder plate (2a) is provided with a plurality of first sieve holes (201). The second cylinder plate (2b) is provided with second sieve holes (202) corresponding to the first sieve holes (201). The first sieve holes (201) and the second sieve holes (202) overlap to form sieve holes (200). The second cylinder plate (2b) is provided with an elastic protrusion (2b1) protruding into the second sieve hole (202). The elastic protrusion (2b1) can move elastically relative to the first cylinder plate (2a).

10. A self-cleaning, anti-clogging feed screening machine according to claim 9, characterized in that, The elastic protrusion (2b1) is constructed as a fan-shaped elastic block, and there are two or more elastic protrusions (2b1). A deformation slit (2b11) is provided between any two adjacent elastic protrusions (2b1). The area of ​​the elastic protrusion (2b1) is 1 / 10 of the area of ​​the first sieve hole (201).

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