A corn raw material screening device

Abstract

The utility model relates to corn raw material screening technical field, the utility model provides a kind of corn raw material screening device, including screening box, the top side wall of screening box is connected with feed bin, feed bin is built-in feed control valve, further including screening board, first discharge port, second discharge port, screening bucket, discharge pipe, first rotating mechanism and scraping mechanism, screening board is fixedly arranged in screening box, the top side of the side wall of screening box is located screening board and is equipped with first discharge port, first discharge port is built-in first control valve, the side wall bottom end of screening box is equipped with second discharge port, second discharge port is built-in second control valve, screening bucket is rotationally arranged on the inner bottom wall of screening box, the side wall top end of screening bucket is fixedly provided with fixed ring, by above technical scheme, for solving the technical problem of the continuity of screening in the process of screening corn raw material by screening bucket in prior art is easily affected by the adhesion in the inner wall of screening bucket.

Description

Technical Field

[0001] This utility model relates to the field of corn raw material screening technology, specifically, to a corn raw material screening device. Background Technology

[0002] In the feed production sector, corn, as a core energy source, directly impacts the nutritional value, palatability, and production stability of the finished feed product through its processing quality. Feed corn typically undergoes a pre-processing procedure of "crushing and screening": first, the corn kernels are crushed to a preset size using a pulverizer (such as a hammer mill or roller mill); then, a screening device separates the kernels that meet the size requirements, removing excessively coarse impurities and overly fine powder, thus providing qualified raw materials for subsequent mixing and pelleting processes. However, in existing production processes, corn raw materials are generally screened using a drum screen. The drum screen relies on the rotation of an inclined cylindrical screen cylinder to move the corn fragments inside the cylinder and achieve grading through screen holes of different sizes. However, the rotation speed of the screen cylinder is fixed. For corn fragments with high moisture content, fine powder is easy to adhere to the cylinder wall, causing blockage and affecting the continuity of screening. Utility Model Content

[0003] To overcome the above-mentioned defects, this utility model provides a corn raw material screening device to solve the technical problem that the screening continuity is easily affected by the adhesion of substances to the inner wall of the screen barrel during the screening of corn raw materials in the prior art.

[0004] According to one aspect, at least one embodiment of the present invention provides a corn raw material screening device, including a screening box, a feeding hopper connected to the top side wall of the screening box, a feeding control valve built into the feeding hopper, a screening plate, a first discharge port, a second discharge port, a screening barrel, a discharge pipe, a first rotating mechanism, and a scraping mechanism. The screening plate is fixedly disposed inside the screening box. The first discharge port is opened on the top side of the screening plate on the side wall of the screening box, and the first discharge port has a first control valve built into it. The second discharge port is opened at the bottom end of the side wall of the screening box, and the second discharge port has a second control valve built into it. The screening barrel is rotatably mounted on the inner bottom wall of the screening box. A fixing ring is fixedly mounted on the top of the side wall of the screening barrel, and the fixing ring contacts the inner wall of the screening box. The discharge pipe is connected to and fixedly mounted on the bottom end of the screening barrel. The discharge pipe extends out of the screening box through the bottom side wall. The discharge pipe has a built-in third control valve. The first rotating mechanism is located between the screening box and the discharge pipe to drive the screening barrel to rotate. The scraping mechanism is located on the screening box to scrape off the corn raw materials attached to the screening barrel and the screening plate.

[0005] Preferably, the first rotating mechanism includes a first cavity, a first gear ring, a first gear, and a first motor. The first cavity is formed inside the screening box, the discharge pipe passes through the first cavity, the first gear ring is fixedly disposed on the outer wall of the discharge pipe, the first gear is rotatably disposed inside the first cavity, the first gear meshes with the first gear ring, the first motor is mounted on the screening box, and the output end of the first motor is fixedly connected to the first gear.

[0006] Furthermore, the scraping mechanism includes a support column, a first scraper, a second rotating mechanism, and an auxiliary scraping mechanism. The support column is rotatably mounted on the top side wall of the screening box, and it is also rotatably connected to the screening plate. A plurality of first scrapers are fixedly mounted on the side wall of the support column, and the first scrapers are in contact with the screening plate. The second rotating mechanism is mounted on the support column and is used to drive the support column to rotate. The auxiliary scraping mechanism is mounted on the support column and is used to scrape off the corn raw material adhering to the inner wall of the screening box.

[0007] Furthermore, the second rotating mechanism includes a second cavity, a second gear ring, a second gear, and a second motor. The second cavity is opened inside the screening box, the support column passes through the second cavity, the second gear ring is fixedly installed on the outer wall of the support column, the second gear is rotatably installed inside the second cavity, the second gear meshes with the second gear ring, and the second motor is installed on the screening box, with the output end of the second motor fixedly connected to the second gear.

[0008] Furthermore, the auxiliary scraping mechanism includes a second scraper, an adjusting groove, and a moving mechanism. Multiple second scrapers are arranged around the periphery of the support column, and multiple adjusting grooves are opened on the side wall of the support column near the second scraper. Multiple adjusting columns are fixedly arranged on the second scraper, and the adjusting columns extend into adjacent adjusting grooves and are slidably connected to the side wall of the adjusting grooves. The moving mechanism is arranged on the support column and is used to drive the adjusting columns to move within the adjusting grooves.

[0009] Based on the above scheme, the moving mechanism includes a threaded rod, a third cavity, a second bevel gear, and a driving mechanism. A threaded rod is rotatably mounted on the bottom of one of the adjusting grooves on the side of the support column near the second scraper. The threaded rod extends into the adjacent adjusting column via a threaded connection. The support column has the third cavity. A first bevel gear is rotatably mounted on the side wall of the third cavity near the threaded rod. The first bevel gear is fixedly connected to the adjacent threaded rod. A second bevel gear is rotatably mounted on the inner top wall of the third cavity and meshes with the first bevel gear. The driving mechanism is mounted on the support column and is used to drive the second bevel gear to rotate.

[0010] Based on the above scheme, the driving mechanism includes a handwheel and a driving rod. The handwheel is rotatably mounted on the inner top wall of the support column, and the driving rod is fixedly mounted between the handwheel and the second bevel gear.

[0011] Based on the above scheme, a fan is provided on one side of the screening box. The input end of the fan is connected to the external environment, and a filter screen is provided at the input end of the fan. The output end of the fan extends into the screening box.

[0012] The beneficial effects of the embodiments of this utility model are as follows: 1. In this utility model, by setting the first rotating mechanism, after the corn raw material is added to the screening box through the feeding hopper, large impurities can be screened through the screening plate under the action of gravity, and then powdery debris can be screened through the screening barrel. At the same time, during the screening process, the operation of the first motor can drive the first gear to rotate, and the meshing of the first gear and the first gear ring can drive the discharge pipe and the screening barrel to rotate, thereby facilitating the improvement of the screening efficiency of the corn raw material by the screening barrel through centrifugal force. 2. In this utility model, by setting up a scraping mechanism, the operation of the second motor can drive the second gear to rotate, and at the same time, the meshing of the second gear and the second gear ring can drive the support column to rotate. Thus, the corn raw material on the screening plate can be stirred by the first scraper while the corn raw material on the surface of the screening plate is scraped off by the first scraper, thereby improving the screening efficiency of the screening plate for corn raw material. 3. In this utility model, by setting up an auxiliary scraping mechanism, the corn raw material in the screening barrel can be stirred by the second scraper during the rotation of the screening barrel, thereby improving the screening efficiency. After screening, the rotation of the handwheel can drive the drive rod and the second bevel gear to rotate. At the same time, the meshing of the second bevel gear and the first bevel gear drives the first bevel gear and the threaded rod to rotate. Then, the threaded engagement of the threaded rod and the adjusting column drives the second scraper to contact the inner wall of the screening barrel, thereby scraping off the debris attached to the inner wall of the screening barrel in conjunction with the rotation of the screening barrel, thereby improving the continuity of screening. 4. In this utility model, by operating the blower, after closing the feed control valve and the third control valve, the first control valve and the second control valve can be opened and the blower can be controlled to operate, and the second discharge port can be connected to the bag separator. Thus, under the action of airflow, large pieces of debris and powder can be discharged through the first discharge port and the second discharge port respectively, thereby facilitating the discharge of debris and powder. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of a corn raw material screening device in one embodiment of the present invention; Figure 2 for Figure 1 A cross-sectional structural schematic diagram of the screening box in the embodiment; Figure 3 for Figure 1 A cross-sectional view of the screening box from another perspective in the embodiment; Figure 4 for Figure 1 A cross-sectional structural schematic diagram of the scraping mechanism in the embodiment; Figure 5 for Figure 1 The embodiment is shown in the structural schematic diagram of the cross-section of the support column.

[0015] In the diagram: 1. Screening box; 2. Feed hopper; 3. Screening plate; 4. First discharge port; 5. Second discharge port; 6. Screening barrel; 7. Fixing ring; 8. Discharge pipe; 9. First cavity; 10. First gear ring; 11. First gear; 12. First motor; 13. Support column; 14. First scraper; 15. Second cavity; 16. Second gear ring; 17. Second gear; 18. Second motor; 19. Second scraper; 20. Adjusting groove; 21. Adjusting column; 22. Threaded rod; 23. First bevel gear; 24. Second bevel gear; 25. Handwheel; 26. Drive rod; 27. Fan. Detailed Implementation The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0016] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0017] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0019] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] like Figures 1-5 As shown, this invention illustrates a corn raw material screening device according to one embodiment of the present invention. The device includes a screening box 1, with a feeding hopper 2 connected to the top side wall of the screening box 1. The feeding hopper 2 has a built-in feeding control valve. The device also includes a screening plate 3, a first discharge port 4, a second discharge port 5, a screening barrel 6, a discharge pipe 8, a first rotating mechanism, and a scraping mechanism. The screening plate 3 is fixedly installed inside the screening box 1. The first discharge port 4 is located on the top side of the screening plate 3 on the side wall of the screening box 1. The first discharge port 4 has a built-in first control valve. The second discharge port 5 is located at the bottom end of the side wall of the screening box 1. The discharge port 5 has a built-in second control valve. The screening barrel 6 is rotatably mounted on the inner bottom wall of the screening box 1. A fixing ring 7 is fixedly mounted on the top of the side wall of the screening barrel 6. The fixing ring 7 is in contact with the inner wall of the screening box 1. The discharge pipe 8 is connected to the bottom end of the screening barrel 6. The discharge pipe 8 passes through the bottom side wall of the screening box 1 and extends out of the screening box 1. The discharge pipe 8 has a built-in third control valve. The first rotating mechanism is located between the screening box 1 and the discharge pipe 8. It is used to drive the screening barrel 6 to rotate. The scraping mechanism is located on the screening box 1. It is used to scrape the corn raw material attached to the screening barrel 6 and the screening plate 3.

[0022] Reference Figures 1-3 The first rotating mechanism includes a first cavity 9, a first gear ring 10, a first gear 11, and a first motor 12. The first cavity 9 is located inside the screening box 1, and the discharge pipe 8 passes through the first cavity 9. The first gear ring 10 is fixedly mounted on the outer wall of the discharge pipe 8. The first gear 11 is rotatably mounted inside the first cavity 9 and meshes with the first gear ring 10. The first motor 12 is mounted on the screening box 1, and the output end of the first motor 12 is fixedly connected to the first gear 11. Specifically, after corn raw materials are added to the screening box 1 through the feed hopper 2, large impurities can be screened through the screening plate 3 under the action of gravity, and then powdery debris can be screened through the screening bucket 6. At the same time, during the screening process, the operation of the first motor 12 can drive the first gear 11 to rotate. Simultaneously, the meshing of the first gear 11 with the first gear ring 10 drives the discharge pipe 8 and the screening bucket 6 to rotate, thereby facilitating the improvement of the screening efficiency of the corn raw materials by the screening bucket 6 through centrifugal force.

[0023] Reference Figures 1-5 The scraping mechanism includes a support column 13, a first scraper 14, a second rotating mechanism, and an auxiliary scraping mechanism. The support column 13 is rotatably mounted on the top side wall of the screening box 1, and it also passes through and is rotatably connected to the screening plate 3. Multiple first scrapers 14 are fixedly mounted on the side wall of the support column 13, and these scrapers 14 contact the screening plate 3. The second rotating mechanism is mounted on the support column 13 to drive its rotation. The auxiliary scraping mechanism is mounted on the support column 13 to scrape away the corn material adhering to the inner wall of the screening barrel 6. The second rotating mechanism includes a second cavity 15, a second gear ring 16, a second gear 17, and a second motor 18. The second cavity 15 is located inside the screening box 1. The second support column 13 passes through the second cavity 15. The second gear ring 16 is fixedly installed on the outer wall of the support column 13. The second gear 17 is rotatably installed in the second cavity 15 and meshes with the second gear ring 16. The second motor 18 is installed on the screening box 1. The output end of the second motor 18 is fixedly connected to the second gear 17. Specifically, the operation of the second motor 18 can drive the second gear 17 to rotate. At the same time, the meshing of the second gear 17 and the second gear ring 16 drives the support column 13 to rotate. Thus, the corn raw material on the screening plate 3 can be stirred by the first scraper 14, and the corn raw material on the surface of the screening plate 3 can be scraped off by the first scraper 14, thereby improving the screening efficiency of the screening plate 3 for corn raw material.

[0024] Reference Figures 3-5The auxiliary scraping mechanism includes a second scraper 19, an adjusting groove 20, and a moving mechanism. Multiple second scrapers 19 are arranged around the periphery of the support column 13. Multiple adjusting grooves 20 are formed on the side wall of the support column 13 near the second scrapers 19. Multiple adjusting columns 21 are fixedly mounted on the second scrapers 19. The adjusting columns 21 extend into adjacent adjusting grooves 20 and are slidably connected to the side wall of the adjusting groove 20. The moving mechanism is mounted on the support column 13 and is used to drive the adjusting columns 21 to move within the adjusting grooves 20. The structure includes a threaded rod 22, a third cavity, a second bevel gear 24, and a drive mechanism. A threaded rod 22 is rotatably mounted on the bottom of one of the adjustment slots 20 on the side of the support column 13 near the second scraper 19. The threaded rod 22 extends into the adjacent adjustment column 21 via a threaded connection. A third cavity is formed inside the support column 13. A first bevel gear 23 is rotatably mounted on the side wall of the third cavity near the threaded rod 22. The first bevel gear 23 is fixedly connected to the adjacent threaded rod 22. The second bevel gear 24 is rotatably mounted on... On the inner top wall of the third cavity, the second bevel gear 24 meshes with the first bevel gear 23. The drive mechanism is mounted on the support column 13 and is used to drive the second bevel gear 24 to rotate. The drive mechanism includes a handwheel 25 and a drive rod 26. The handwheel 25 is rotatably mounted on the inner top wall of the support column 13, and the drive rod 26 is fixedly mounted between the handwheel 25 and the second bevel gear 24. Specifically, the second scraper 19 can stir the corn raw material in the screening barrel 6 during the rotation of the screening barrel 6, thereby improving the screening efficiency. After screening, the rotation of the handwheel 25 can drive the drive rod 26 and the second bevel gear 24 to rotate. At the same time, the meshing of the second bevel gear 24 with the first bevel gear 23 drives the first bevel gear 23 and the threaded rod 22 to rotate. Then, the threaded engagement of the threaded rod 22 with the adjusting column 21 drives the second scraper 19 to contact the inner wall of the screening barrel 6, thereby scraping off the debris attached to the inner wall of the screening barrel 6 in conjunction with the rotation of the screening barrel 6, thereby improving the continuity of screening.

[0025] Reference Figures 1-3 A blower 27 is installed on one side of the screening box 1. The input end of the blower 27 is connected to the external environment, and a filter screen is installed at the input end of the blower 27. The output end of the blower 27 extends into the screening box 1. Specifically, after closing the feed control valve and the third control valve, the first control valve and the second control valve can be opened to control the blower 27 to work and connect the second discharge port 5 to the bag separator. Thus, under the action of airflow, large pieces of debris and powder can be discharged through the first discharge port 4 and the second discharge port 5 respectively, which facilitates the discharge of debris and powder.

[0026] In this embodiment, during use, after the operator adds corn raw material to the screening box 1 through the feed hopper 2, large impurities can be screened through the screening plate 3 under gravity, and then powdery debris can be screened through the screening bucket 6. During the screening process, the operation of the first motor 12 drives the first gear 11 to rotate. Simultaneously, the meshing of the first gear 11 with the first gear ring 10 drives the discharge pipe 8 and the screening bucket 6 to rotate, thereby facilitating the improvement of the screening efficiency of the corn raw material by centrifugal force. During the screening process, the operator controls the second motor 18 to operate, which drives the second gear 17 to rotate. Simultaneously, the meshing of the second gear 17 with the second gear ring 16 drives the support column 13 to rotate. This allows the first scraper 14 to stir the corn raw material on the screening plate 3 while simultaneously scraping off the corn raw material from the surface of the screening plate 3, thereby improving the screening efficiency of the corn raw material by the screening plate 3. The second scraper 19 stirs the corn raw material in the screening barrel 6 during its rotation, thereby improving screening efficiency. After screening, the handwheel 25 rotates to drive the drive rod 26 and the second bevel gear 24. Simultaneously, the meshing of the second bevel gear 24 with the first bevel gear 23 drives the first bevel gear 23 and the threaded rod 22 to rotate. The threaded engagement between the threaded rod 22 and the adjusting column 21 causes the second scraper 19 to contact the inner wall of the screening barrel 6, thus scraping off the debris attached to the inner wall of the screening barrel 6 in conjunction with the rotation of the screening barrel 6, thereby improving screening continuity. After screening, the operator closes the feed control valve and the third control valve, then opens the first control valve and the second control valve and controls the blower 27 to work, connecting the second discharge port 5 to the bag separator. Under the action of airflow, large pieces of debris and powder are discharged through the first discharge port 4 and the second discharge port 5 respectively, facilitating the discharge of debris and powder.

[0027] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A corn raw material screening device, comprising a screening box (1), wherein a feed hopper (2) is connected to the top side wall of the screening box (1), and the feed hopper (2) has a built-in feed control valve, characterized in that, Also includes: Screening plate (3), the screening plate (3) is fixedly installed inside the screening box (1); The first discharge port (4) and the second discharge port (5) are provided on the side wall of the screening box (1) located on the top side of the screening plate (3). The first discharge port (4) is equipped with a first control valve. The second discharge port (5) is provided at the bottom of the side wall of the screening box (1). The second discharge port (5) is equipped with a second control valve. Screening barrel (6), the screening barrel (6) is rotatably mounted on the inner bottom wall of the screening box (1), and a fixing ring (7) is fixedly mounted on the top of the side wall of the screening barrel (6), the fixing ring (7) is in contact with the inner wall of the screening box (1); The discharge pipe (8) is connected to and fixedly installed at the bottom end of the screening barrel (6). The discharge pipe (8) extends through the bottom side wall of the screening box (1) and extends out of the screening box (1). The discharge pipe (8) has a built-in third control valve. The first rotating mechanism is disposed between the screening box (1) and the discharge pipe (8) and is used to drive the screening barrel (6) to rotate. A scraping mechanism is provided on the screening box (1) for scraping off corn raw materials attached to the screening barrel (6) and the screening plate (3).

2. The corn raw material screening device according to claim 1, characterized in that, The first rotating mechanism includes: The first cavity (9) is opened inside the screening box (1), and the discharge pipe (8) passes through the first cavity (9). The first toothed ring (10) is fixedly disposed on the outer wall of the discharge pipe (8); The first gear (11) is rotatably disposed in the first cavity (9) and meshes with the first gear ring (10); The first motor (12) is mounted on the screening box (1), and the output end of the first motor (12) is fixedly connected to the first gear (11).

3. The corn raw material screening device according to claim 2, characterized in that, The scraping mechanism includes: A support column (13) is provided through and rotatably mounted on the top side wall of the screening box (1). The support column (13) passes through the screening plate (3) and is rotatably connected to the screening plate (3). The first scraper (14) is fixedly provided on the side wall of the support column (13), and the first scraper (14) is in contact with the screening plate (3). The second rotating mechanism is disposed on the support column (13) and is used to drive the support column (13) to rotate; An auxiliary scraping mechanism is provided on the support column (13) for scraping off the corn raw material attached to the inner wall of the screening barrel (6).

4. The corn raw material screening device according to claim 3, characterized in that, The second rotating mechanism includes: The second cavity (15) is opened inside the screening box (1), and the support column (13) passes through the second cavity (15). The second toothed ring (16) is fixedly disposed on the outer wall of the support column (13); The second gear (17) is rotatably disposed in the second cavity (15) and meshes with the second gear ring (16); The second motor (18) is mounted on the screening box (1), and the output end of the second motor (18) is fixedly connected to the second gear (17).

5. A corn raw material screening device according to claim 4, characterized in that, The auxiliary scraping mechanism includes: Second scraper (19), a plurality of second scrapers (19) are provided on the periphery of the support column (13). Adjustment groove (20): The support column (13) has multiple adjustment grooves (20) on the side wall near the second scraper (19). Multiple adjustment columns (21) are fixedly installed on the second scraper (19). The adjustment columns (21) extend into the adjacent adjustment grooves (20) and are slidably connected to the side wall of the adjustment grooves (20). A moving mechanism is provided on the support column (13) for driving the adjusting column (21) to move within the adjusting groove (20).

6. A corn raw material screening device according to claim 5, characterized in that, The moving mechanism includes: A threaded rod (22) is rotatably provided at the bottom of one of the adjustment grooves (20) on the side of the support column (13) near the second scraper (19). The threaded rod (22) extends into the adjacent adjustment column (21) through a threaded engagement. The third cavity is provided inside the support column (13). A first bevel gear (23) is rotatably provided on the side wall of the third cavity near the threaded rod (22). The first bevel gear (23) is fixedly connected to the nearby threaded rod (22). The second bevel gear (24) is rotatably mounted on the inner top wall of the third cavity, and the second bevel gear (24) meshes with the first bevel gear (23); A drive mechanism is provided on the support column (13) for driving the second bevel gear (24) to rotate.

7. A corn raw material screening device according to claim 6, characterized in that, The drive mechanism includes: Handwheel (25), which is rotatably mounted on the inner top wall of the support column (13); A drive rod (26) is fixedly disposed between the handwheel (25) and the second bevel gear (24).

8. A corn raw material screening device according to claim 7, characterized in that, A fan (27) is provided on one side of the screening box (1). The input end of the fan (27) is connected to the external environment. A filter screen is provided at the input end of the fan (27). The output end of the fan (27) extends into the screening box (1).

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