Grain conveyor with screening function

Abstract

The invention discloses a grain conveyor with a screening function, and belongs to the technical field of grain screening machines, the grain conveyor comprises a feeding port, a shaking screen, a machine shell, an eccentric wheel, an anti-blocking structure, a horizontal adjusting device and a discharging structure, the feeding port is fixedly arranged on the upper wall of the machine shell, and the discharging structure is arranged on the bottom wall of the machine shell; the shaking screen and the eccentric wheel are both clamped and rotationally arranged on the inner wall of the machine shell, the eccentric wheel is in contact connection with the shaking screen, a torsional spring is arranged at the joint of the shaking screen and the machine shell, the horizontal adjusting device is clamped and installed on the inner wall of the machine shell, and the anti-blocking structure is fixedly connected with the horizontal adjusting device. In order to overcome the defects that in the prior art, screening is not thorough due to the fact that a screen is prone to blockage and materials are prone to accumulation, the grain conveyor with the screening function is provided, and the problems that in the current market, screening holes are prone to blockage, and the screening efficiency is low and the cleaning effect is poor due to material accumulation are effectively solved.

Description

Technical Field

[0001] This invention belongs to the field of grain screening machine technology, specifically referring to a grain conveyor with screening function. Background Technology

[0002] In existing technologies, grain conveyors with screening functions, especially those used for initial cleaning of tuber crops such as potatoes and sweet potatoes after harvest, have been widely used. These devices typically separate impurities such as soil and small stones adhering to the crop surface during transport by setting screen holes in the conveyor belt or conveyor surface.

[0003] In practical use, it has been found that the screening efficiency and cleaning effect are often unsatisfactory, mainly due to the following two prominent problems: First, the screening holes are easily clogged by sticky debris such as damp soil, broken potato peels, or stems and leaves. As operation continues, the blockage accumulates, the effective screening area is greatly reduced, impurities cannot fall smoothly, the screening function rapidly declines or even fails, and frequent shutdowns are required for manual cleaning, which seriously affects the continuity of operation and increases labor intensity. Second, the crop is unevenly distributed on the conveying surface, often resulting in excessively thick and concentrated accumulation in some areas. When the crop layer, such as potatoes, is too thick, the individual plants in the lower layer are severely compressed and covered by the material above, and the soil attached to their surface is difficult to shake off through the limited screen holes; at the same time, the excessively dense accumulation also hinders the relative movement and turning of the crops, so that the screening process only acts on the outermost layer, and the overall screening effect is significantly reduced. The combined problems of screen clogging and uneven material distribution result in the output crop still containing a large amount of impurities, with cleanliness far below the requirements for subsequent storage or processing. This often necessitates secondary processing, increasing production costs and labor time. Therefore, there is an urgent need for a new type of grain conveying equipment that can effectively prevent screen clogging and promote uniform material dispersion to improve screening efficiency and cleanliness. Summary of the Invention

[0004] In response to the above situation, and to overcome the shortcomings of existing technologies such as easy clogging of screens and easy accumulation of materials leading to incomplete screening, this invention provides a grain conveyor with screening function, which effectively solves the problems of low screening efficiency and poor cleaning effect caused by easy clogging of screen holes and material accumulation in the current market.

[0005] The technical solution adopted by the present invention is as follows: The present invention provides a grain conveyor with screening function, including a feed inlet, a vibrating screen, a casing, an eccentric wheel, an anti-clogging structure, a leveling device, and a discharge structure. The feed inlet is fixedly installed on the upper wall of the casing, and the discharge structure is installed on the bottom wall of the casing. The vibrating screen and the eccentric wheel are both engaged and rotatably installed on the inner wall of the casing. The eccentric wheel is in contact with the vibrating screen. A torsion spring is provided at the connection between the vibrating screen and the casing. The leveling device is engaged and installed on the inner wall of the casing, and the anti-clogging structure is fixedly connected to the leveling device.

[0006] Furthermore, the vibrating screen includes a primary screen plate and a secondary screen plate. A connecting plate is provided on the bottom wall of the primary screen plate. The primary screen plate and the secondary screen plate are fixedly connected by the connecting plate. The primary screen plate is composed of a grooved plate and a convex rib plate. The grooved plate is provided with screening holes. The depth of the grooved plate gradually increases from near the feed inlet to far away from the feed inlet to limit the movement trajectory of the material, which is beneficial for the dispersion and screening of tuber crops such as potatoes.

[0007] Furthermore, the secondary sieve plate has the same shape as the primary sieve plate, but the diameter of the screening holes on the secondary sieve plate is smaller than that on the primary sieve plate. The secondary sieve plate is located below the primary sieve plate, but the primary sieve plate is longer than the secondary sieve plate, and is used to further screen crops that have fallen off the primary sieve plate.

[0008] Furthermore, the horizontal adjustment device includes an adjustment cylinder, a horizontal lateral support, and a horizontal limiting track. The adjustment cylinder is fixedly installed on the inner wall of the housing. The horizontal lateral support is fixedly connected to the adjustment cylinder and can move with the extension and retraction of the adjustment cylinder. The horizontal limiting track is fixedly installed on the inner wall of the housing, and the horizontal lateral support engages and slides within the horizontal limiting track.

[0009] Furthermore, the vibrating screen is placed on the side of the machine casing away from the feed inlet.

[0010] Furthermore, the connecting plate between the primary sieve plate and the secondary sieve plate is provided with a slot to facilitate the extension and retraction of the cylinder.

[0011] Furthermore, the anti-clogging structure includes a round-headed unblocking column, a cleaning plate, a cleaning plate slot, a rotation limiting slot, and a rotation limiting column. The rotation limiting column is fixedly mounted on a horizontal sliding bracket. The round-headed unblocking column is engaged and installed on the rotation limiting column. The rotation limiting slot is located inside the round-headed unblocking column and is engaged and slidably connected with the rotation limiting column. The cleaning plate slot is located on the side wall of the round-headed unblocking column, and the cleaning plate is engaged and slidably within the cleaning plate slot.

[0012] Furthermore, the cleaning plate and the cleaning plate slot are connected by a spring.

[0013] Furthermore, the cleaning plate has a triangular side profile and a hexagonal front profile. The triangular side profile of the cleaning plate reduces the resistance between the cleaning plate and the screening hole when the round-headed dredging column enters and exits the screening hole. The hexagonal front profile of the cleaning plate, which is wider in the middle and narrower at both ends, increases the contact area with the hole wall when entering and exiting the screening hole, thereby expanding the cleaning range.

[0014] Furthermore, the anti-clogging structure also includes a spiral track, a linear track, a track block, a return spring, a spring retainer, and a retainer groove. The spiral track and the linear track are both set on the side wall of the rotating limiting column. The spiral track and the linear track are connected end to end to form a closed track. The track block is fixedly set on the rotating limiting groove. The track block engages and slides along the spiral track and the linear track. The retainer groove is set on the bottom wall of the round-headed unblocking column. The spring retainer engages and rotates within the retainer groove. The two ends of the return spring are fixedly connected to the spring retainer and the rotating limiting column, respectively.

[0015] Furthermore, the discharge structure includes discharge slide rail one, discharge slide rail two, discharge slide rail three, discharge port one, discharge port two, and discharge port three. Discharge slide rail one, discharge slide rail two, and discharge slide rail three are respectively fixedly installed on the inner wall of the machine housing. Discharge slide rail one, discharge slide rail two, and discharge slide rail three are parallel to each other. Discharge slide rail two is located below the primary screen plate, and discharge slide rail three is located below the secondary screen plate. Discharge port one, discharge port two, and discharge port three are horizontally arranged on the bottom wall of the machine housing, and discharge port one, discharge port two, and discharge port three are respectively connected to discharge slide rail one, discharge slide rail two, and discharge slide rail three.

[0016] Furthermore, a conveyor belt is provided above the feed inlet, which is driven by a servo motor, and a spiral auger is provided below the discharge structure. The crops are first screened by the conveyor belt and then sent out from the discharge end.

[0017] Furthermore, the housing is equipped with a laser emitter, a laser receiver, and a central controller. The laser emitter and laser receiver are respectively located at both ends of the inner wall of the housing, and the laser emitter, laser receiver, and convex plate are arranged in a straight line. When the laser emitter emits a signal, if too much crop falls into the feed inlet, it will block the laser signal between the laser emitter and the laser receiver for a long time. After the laser signal is interrupted for a certain period of time, the central controller controls the servo motor on the conveyor belt to slow down the rotation speed, thereby reducing the amount of crop entering the feed inlet.

[0018] Furthermore, the vibrating screen forms a 6° angle with the ground.

[0019] Furthermore, the horizontal limiting track is parallel to the vibrating screen in a state where it is not collided with the eccentric wheel.

[0020] Furthermore, the spring constant of the reset spring is less than that of the spring on the cleaning plate.

[0021] Furthermore, a retractable rubber sheet can be installed on the bottom wall of the cleaning plate. After the cleaning plate passes through the screening hole, the rubber sheet makes full contact with the groove plate and cleans the sand and soil at the edge of the screening hole.

[0022] Furthermore, both the spring retaining ring and the bottom wall of the rotating limiting column are equipped with electromagnets. When the two sets of electromagnets are energized, they attract each other, and the round-headed unblocking column will no longer come into contact with the bottom wall of the vibrating screen. This can effectively prevent the collision between the vibrating screen and the round-headed unblocking column when the screening holes do not need to be cleaned.

[0023] This solution provides a grain conveyor with a screening function, which has the following advantages: (1) Effectively prevent screen hole clogging and improve screening continuity: The present invention uses the anti-clogging structure to automatically clean the mud and debris stuck in the screen hole by the coordinated movement of the round-headed unblocking column and the cleaning plate in the screening hole. The special triangular side and hexagonal front design of the cleaning plate can reduce resistance and increase the cleaning contact area when entering and exiting the screen hole, thereby significantly reducing the probability of screen hole clogging, reducing the frequency of downtime cleaning, and ensuring long-term continuous and stable operation of the equipment. (2) To achieve uniform dispersion and graded screening of materials, and improve cleanliness and screening accuracy: A primary screen plate with a combination of grooved plate and convex plate is adopted, and the groove depth gradually changes along the material direction. Combined with the vibration of the shaking screen, the potatoes and other grains are naturally rolled and dispersed during the transportation process, avoiding local accumulation. Combined with the primary and secondary screen plates arranged above and below for multi-stage screening, materials and impurities of different sizes can be effectively layered and separated, thereby greatly improving the overall screening effect and the cleanliness of the output. (3) It has intelligent control function to optimize the operation process and energy efficiency: the laser emitter and receiver installed in the machine casing monitor the material accumulation status, and the speed of the feed conveyor belt is adjusted by the central controller to realize the automatic balance of the feed amount, which can prevent the screening efficiency from decreasing due to excessive feeding. At the same time, the horizontal adjustment device can make the anti-clogging structure move laterally to realize the cyclic cleaning of the screen holes at different positions. The whole process is highly automated, effectively reducing the need for manual intervention and energy consumption. Attached Figure Description

[0024] Figure 1 A left-side structural schematic diagram of a grain conveyor with screening function provided by the present invention; Figure 2Right view structural schematic diagram of a grain conveyor with screening function provided by the present invention; Figure 3 This invention provides a schematic diagram of the internal right-side structure of a grain conveyor with a screening function; Figure 4 This invention provides a schematic diagram of the internal left-side structure of a grain conveyor with a screening function; Figure 5 A schematic diagram of the anti-blocking structure on the horizontal transverse support; Figure 6 A three-dimensional sectional view of the anti-clogging structure; Figure 7 Exploded view of the structure to prevent blockage; Figure 8 A schematic diagram of the connection structure of a grain conveyor with screening function, a conveyor belt and a spiral auger provided by the present invention; Figure 9 This is a three-dimensional sectional view of the horizontal adjustment device.

[0025] The components include: 1. Feed inlet; 2. Vibrating screen; 3. Machine casing; 4. Eccentric wheel; 5. Anti-clogging structure; 6. Horizontal adjustment device; 7. Discharge structure; 8. Primary screen plate; 9. Secondary screen plate; 10. Grooved plate; 11. Raised rib plate; 12. Screening hole; 13. Adjusting cylinder; 14. Horizontal transverse support; 15. Horizontal limit track; 16. Connecting plate; 17. Slot; 18. Round-headed unblocking column; 19. Cleaning plate. 0. Cleaning plate slot; 21. Rotary limit slot; 22. Rotary limit column; 23. Spiral track; 24. Linear track; 25. Track block; 26. Reset spring; 27. Spring retainer; 28. Retainer retainer groove; 29. ​​Discharge slide rail one; 30. Discharge slide rail two; 31. Discharge slide rail three; 32. Discharge port one; 33. Discharge port two; 34. Discharge port three; 35. Conveyor belt; 36. Spiral auger.

[0026] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not 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 invention.

[0029] like Figures 1-9 As shown, the present invention provides a grain conveyor with screening function, including a feed inlet 1, a vibrating screen 2, a housing 3, an eccentric wheel 4, an anti-clogging structure 5, a leveling device 6, and a discharge structure 7. The feed inlet 1 is fixedly installed on the upper wall of the housing 3, and the discharge structure 7 is installed on the bottom wall of the housing 3. The vibrating screen 2 and the eccentric wheel 4 are both engaged and rotatably installed on the inner wall of the housing 3. The eccentric wheel 4 is in contact with the vibrating screen 2. A torsion spring is provided at the connection between the vibrating screen 2 and the housing 3. The leveling device 6 is engaged and installed on the inner wall of the housing 3, and the anti-clogging structure 5 is fixedly connected to the leveling device 6.

[0030] A conveyor belt 35 is provided above the feed inlet 1. The conveyor belt 35 is driven by a servo motor. A spiral auger 36 is provided below the discharge structure 7.

[0031] The housing 3 contains a laser emitter, a laser receiver, and a central controller. The laser emitter and the laser receiver are respectively located at both ends of the inner wall of the housing 3.

[0032] The vibrating screen 2 includes a primary screen plate 8 and a secondary screen plate 9. The primary screen plate 8 and the secondary screen plate 9 are fixedly connected by a connecting plate 16. The primary screen plate 8 is composed of a grooved plate 10 and a convex rib plate 11. The grooved plate 10 is provided with screening holes 12. The depth of the grooved plate 10 gradually increases from near the feed inlet 1 to far away from the feed inlet 1. The laser emitter, the laser receiver and the convex rib plate 11 are arranged in a straight line. The connecting plate 16 between the primary screen plate 8 and the secondary screen plate 9 is provided with a cylinder extension groove 17.

[0033] The secondary sieve plate 9 has the same shape as the primary sieve plate 8. The diameter of the screening holes 12 on the secondary sieve plate 9 is smaller than the diameter of the screening holes 12 on the primary sieve plate 8. The secondary sieve plate 9 is located below the primary sieve plate 8.

[0034] The horizontal adjustment device 6 includes an adjustment cylinder 13, a horizontal transverse support 14, and a horizontal limiting track 15. The adjustment cylinder 13 is fixedly installed on the inner wall of the housing 3. The horizontal transverse support 14 is fixedly connected to the adjustment cylinder 13. The horizontal limiting track 15 is fixedly installed on the inner wall of the housing 3. The horizontal transverse support 14 engages and slides within the horizontal limiting track 15.

[0035] The anti-clogging structure 5 includes a round-headed unblocking column 18, a cleaning plate 19, a cleaning plate slot 20, a rotation limiting slot 21, and a rotation limiting column 22. The rotation limiting column 22 is fixedly mounted on the horizontal sliding bracket 14. The round-headed unblocking column 18 is engaged and installed on the rotation limiting column 22. The rotation limiting slot 21 is located inside the round-headed unblocking column 18. The rotation limiting slot 21 and the rotation limiting column 22 are engaged and slidably connected. The cleaning plate slot 20 is located on the side wall of the round-headed unblocking column 18. The cleaning plate 19 is engaged and slidably within the cleaning plate slot 20.

[0036] The cleaning plate 19 and the cleaning plate slot 20 are connected by a spring.

[0037] The side section of the cleaning plate 19 has a triangular structure, while the front section of the cleaning plate 19 has a hexagonal structure.

[0038] The anti-blocking structure 5 also includes a spiral track 23, a linear track 24, a track block 25, a return spring 26, a spring retainer 27, and a retainer groove 28. The spiral track 23 and the linear track 24 are both set on the side wall of the rotating limiting column 22. The spiral track 23 and the linear track 24 are connected end to end to form a closed track. The track block 25 is fixedly set on the rotating limiting groove 21. The track block 25 engages and slides along the spiral track 23 and the linear track 24. The retainer groove 28 is set on the bottom wall of the round-headed unblocking column 18. The spring retainer 27 engages and rotates in the retainer groove 28. The two ends of the return spring 26 are fixedly connected to the spring retainer 27 and the rotating limiting column 22, respectively.

[0039] The discharge structure 7 includes discharge slide rail 1 29, discharge slide rail 2 30, discharge slide rail 3 31, discharge port 1 32, discharge port 2 33, and discharge port 34. Discharge slide rail 1 29, discharge slide rail 2 30, and discharge slide rail 3 31 are fixedly installed on the inner wall of the machine housing 3. Discharge slide rail 1 29, discharge slide rail 2 30, and discharge slide rail 3 31 are parallel to each other. Discharge slide rail 2 30 is located below the primary screen plate 8, and discharge slide rail 3 31 is located below the secondary screen plate 9. Discharge port 1 32, discharge port 2 33, and discharge port 3 34 are horizontally arranged on the bottom wall of the machine housing 3, and discharge port 1 32, discharge port 2 33, and discharge port 3 34 are respectively connected to discharge slide rail 1 29, discharge slide rail 2 30, and discharge slide rail 3 31.

[0040] The spring constant of the return spring 26 is less than that of the spring on the cleaning plate 19.

[0041] Both the spring retainer 27 and the bottom wall of the rotating limiting column 22 are equipped with electromagnets, and the two sets of electromagnets attract each other when energized.

[0042] In practical use, potatoes with soil are conveyed to the feed inlet 1 via the conveyor belt 35. After being guided by the feed inlet 1, they fall onto the vibrating screen 2. The primary screen plate 8 is composed of multiple sets of grooved plates 10 and convex ribs 11 arranged in a horizontal array. The height of the grooved plates 10 and convex ribs 11 and the eccentric wheel 4 are inversely proportional to the distance between them. When the potatoes roll on the inclined vibrating screen 2, the mud and sand on the surface of the potatoes fall onto the primary screen plate 8, which increases the friction between the crops (such as potatoes) and the surface of the screen plate, thereby reducing the kinetic energy of their movement. The rotation of the eccentric wheel 4 needs to be controlled. When the eccentric wheel 4 rotates, it hits the bottom wall of the secondary screen plate 9, causing the shaking screen 2 to swing up and down, so as to prevent mud and sand from accumulating in the groove plate 10. During the shaking of the primary screen plate 8, large potatoes cannot pass through the screening holes 12 on the primary screen plate 8 and fall down the primary screen plate 8 onto the inclined discharge slide rail 29 below. Guided by the discharge slide rail 29, they finally fall from the discharge port 32 and are transported away by the spiral auger 36. Small potatoes and sand fall onto the secondary screen plate 9 below. The secondary screen plate 9 vibrates, sending potatoes larger than the diameter of the screening holes 12 on the secondary screen plate 9 to the discharge slide rail 2 30 and being discharged by the discharge port 2 33. Finally, the remaining small potatoes and sand lumps were discharged from outlet 34; When potatoes pass through the sieve hole 12, some of the sand on the potatoes sticks to the sieve hole 12, which reduces the diameter of the sieve hole 12 and affects the sieving accuracy of the shaking sieve 2. Therefore, it is necessary to clean the sieve hole 12 on the shaking sieve 2 regularly. Each time the vibrating screen 2 vibrates, the round-headed unblocking column 18 passes through the screening hole 12, and the cleaning plate 19 passes through the screening hole 12 at the same time. Since the elastic coefficient of the spring on the cleaning plate 19 is greater than the elastic coefficient of the return spring 26, the cleaning plate 19 is first pressed down along the straight track 24 to the spiral track 23 by the screening hole 12 together with the round-headed unblocking column 18. Then, under the influence of the side wall of the inclined surface of the cleaning plate 19, the cleaning plate 19 enters the cleaning plate slot 20, realizing the effect of the round-headed unblocking column 18 and the cleaning plate 19 passing through the screening hole 12. After the cleaning plate 19 passes through the sieve hole 12, the return spring 26 pops up, and the track block 25 inside the round-headed unblocking column 18 rotates and rises along the spiral track 23. The cleaning plate 19 sweeps away the sand and soil attached to the sieve hole 12, ensuring the sieve hole 12 has a good sieving effect on potatoes of different sizes. After cleaning the screening holes 12 on the same straight line for a period of time, move the anti-clogging structure 5 to another straight line, extend the adjusting cylinder 13, and the horizontal moving bracket 14 drives the anti-clogging structure 5 to move along the horizontal limit track 15 to below the next screening hole 12. When cleaning of the screening hole 12 is not required, the electromagnets on the spring retainer 27 and the rotating limit column 22 are energized, the spring retainer 27 is attracted to the rotating limit column 22, and the round-headed unblocking column 18 overcomes the elastic force of the return spring 26 and is attracted to the rotating limit column 22, thus preventing the round-headed unblocking column 18 from contacting the vibrating screen 2. When too many potatoes enter the vibrating screen 2 through the feed inlet 1, the potatoes stop rolling along the groove plate 10. Some potatoes block the signal sent from the laser emitter to the laser receiver above the convex plate 11. After the signal is interrupted, the central processing unit controls the servo motor on the conveyor belt 35 to reduce the speed, thereby avoiding a decrease in screening effect due to excessive feeding.

[0043] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A grain conveyor with a screening function, characterized in that: The system includes a feed inlet (1), a vibrating screen (2), a housing (3), an eccentric wheel (4), an anti-clogging structure (5), a leveling device (6), and a discharge structure (7). The feed inlet (1) is fixedly installed on the upper wall of the housing (3), and the discharge structure (7) is installed on the bottom wall of the housing (3). The vibrating screen (2) and the eccentric wheel (4) are both engaged and rotated on the inner wall of the housing (3). The eccentric wheel (4) is in contact with the vibrating screen (2). A torsion spring is provided at the connection between the vibrating screen (2) and the housing (3). The leveling device (6) is engaged and installed on the inner wall of the housing (3). The anti-clogging structure (5) is fixedly connected to the leveling device (6). The anti-blocking structure (5) includes a round-headed unblocking column (18), a cleaning plate (19), a cleaning plate slot (20), a rotation limiting slot (21), and a rotation limiting column (22). The rotation limiting column (22) is fixedly installed on the horizontal adjustment device (6). The round-headed unblocking column (18) is engaged and installed on the rotation limiting column (22). The rotation limiting slot (21) is located inside the round-headed unblocking column (18). The rotation limiting slot (21) is engaged and slidably connected with the rotation limiting column (22). The cleaning plate slot (20) is located on the side wall of the round-headed unblocking column (18). The cleaning plate (19) is engaged and slidably installed inside the cleaning plate slot (20).

2. A grain conveyor with screening function according to claim 1, characterized in that: The cleaning plate (19) and the cleaning plate slot (20) are connected by a spring; the side profile of the cleaning plate (19) presents a triangular structure, and the front profile of the cleaning plate (19) is a hexagonal structure.

3. A grain conveyor with screening function according to claim 2, characterized in that: The anti-blocking structure (5) also includes a spiral track (23), a straight track (24), a track block (25), a reset spring (26), a spring retainer (27), and a retainer groove (28). The spiral track (23) and the straight track (24) are both set on the side wall of the rotating limiting column (22). The spiral track (23) and the straight track (24) are connected end to end to form a closed track. The track block (25) is fixedly set on the rotating limiting groove (21). The track block (25) engages and slides along the spiral track (23) and the straight track (24). The retainer groove (28) is set on the bottom wall of the round-headed unblocking column (18). The spring retainer (27) engages and rotates in the retainer groove (28). The two ends of the reset spring (26) are fixedly connected to the spring retainer (27) and the rotating limiting column (22), respectively.

4. A grain conveyor with screening function according to claim 3, characterized in that: The vibrating screen (2) includes a primary screen plate (8) and a secondary screen plate (9). A connecting plate (16) is provided on the bottom wall of the primary screen plate (8). The primary screen plate (8) and the secondary screen plate (9) are fixedly connected by the connecting plate (16). The primary screen plate (8) is provided with a grooved plate (10) and a raised rib plate (11). The grooved plate (10) is provided with screening holes (12). The depth of the grooved plate (10) gradually increases from near the feed inlet (1) to far away from the feed inlet (1).

5. A grain conveyor with screening function according to claim 4, characterized in that: The shape of the secondary sieve plate (9) is the same as that of the primary sieve plate (8). The diameter of the screening holes (12) on the secondary sieve plate (9) is smaller than that on the primary sieve plate (8). The secondary sieve plate (9) is located below the primary sieve plate (8).

6. A grain conveyor with screening function according to claim 5, characterized in that: The discharge structure (7) includes discharge slide rail one (29), discharge slide rail two (30), discharge slide rail three (31), discharge port one (32), discharge port two (33), and discharge port three (34). The discharge slide rail one (29), discharge slide rail two (30), and discharge slide rail three (31) are respectively fixedly installed on the inner wall of the machine casing (3). The discharge slide rail one (29), discharge slide rail two (30), and discharge slide rail three (31) are parallel to each other. The discharge slide rail 2 (30) is located below the primary screen plate (8), and the discharge slide rail 3 (31) is located below the secondary screen plate (9). The discharge port 1 (32), discharge port 2 (33) and discharge port 3 (34) are arranged horizontally on the bottom wall of the casing (3), and the discharge port 1 (32), discharge port 2 (33) and discharge port 3 (34) are respectively connected to the discharge slide rail 1 (29), discharge slide rail 2 (30) and discharge slide rail 3 (31).

7. A grain conveyor with screening function according to claim 6, characterized in that: The horizontal adjustment device (6) includes an adjustment cylinder (13), a horizontal transverse support (14), and a horizontal limiting track (15). The adjustment cylinder (13) is fixedly installed on the inner wall of the housing (3). The horizontal transverse support (14) is fixedly connected to the adjustment cylinder (13). The horizontal limiting track (15) is fixedly installed on the inner wall of the housing (3). The horizontal transverse support (14) engages and slides within the horizontal limiting track (15).

8. A grain conveyor with screening function according to claim 7, characterized in that: The connecting plate (16) between the primary screen plate (8) and the secondary screen plate (9) is provided with a cylinder extension groove (17); a conveyor belt (35) is provided above the feed inlet (1), the conveyor belt (35) is driven by a servo motor, and a spiral auger (36) is provided below the discharge structure (7).

9. A grain conveyor with screening function according to claim 8, characterized in that: The housing (3) is equipped with a laser emitter, a laser receiver and a central controller. The laser emitter and the laser receiver are respectively located at both ends of the inner wall of the housing (3), and the laser emitter, the laser receiver and the convex plate (11) are arranged in a straight line. The elastic coefficient of the reset spring (26) is less than the elastic coefficient of the spring on the cleaning plate (19). The spring retainer (27) and the bottom wall of the rotation limit column (22) are both equipped with electromagnets, and the two sets of electromagnets attract each other after being energized.

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