Crop seed selection system

Abstract

The invention relates to the technical field of seed selection, and provides a crop seed selection system which comprises a screening device, the screening device is detachably connected with a first air screening machine, the screening device is used for separating seeds from seed shells and dust, and the screening device comprises an elevator, a winnowing mechanism and a cyclone separator; the elevator is arranged on the side close to the first air screening machine, grains enter the elevator after being screened in the winnowing mechanism, the winnowing mechanism is used for separating seed husks and dust in the grains, the cyclone separator communicates with the winnowing mechanism, the cyclone separator is used for separating and collecting the seed husks and the dust in the winnowing mechanism, and the cyclone separator is used for separating and collecting the seed husks and the dust in the winnowing mechanism. The airtight device is detachably connected with the discharging port of the elevator, the airtight device is used for controlling the air inlet in the elevator, then the air inlet direction of the winnowing mechanism is adjusted, and the technical problem that in the prior art, air pollution is large in the crop seed selecting process is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of seed selection, in particular to a crop seed selection system. BACKGROUND

[0002] After the crops are harvested, part of them need to be left as seeds for subsequent planting. Because a large amount of plant debris, grain husks and dust will be mixed in the crops during large-scale harvesting, the seeds need to be selected before use. In addition to removing dust, chaff and bran, the seeds also need to be separated from undesirable seeds such as jointed wheat, oat, light impurities, broken seeds, sprouted seeds, worm-eaten seeds, moldy seeds, gaeumannomyces graminis, and smut seeds, so as to complete the selection of seeds.

[0003] In the prior art, the selection of seeds is usually divided into several steps. First, the seeds are shelled, and then the seeds and seed shells are lifted to a higher position and fed into a screening machine and a specific gravity separator for screening in sequence to separate bad seeds and dust. In this process, the movement of dust and shells with seeds will cause some pollution to the seed selection site. The dust spreads in the air, and the shells may also affect the subsequent seed screening. Therefore, a new selection system is needed to reduce the influence of shells and dust on the air and the screening results during the seed screening process. SUMMARY

[0004] To overcome the above-mentioned defects, the embodiments of the present application provide a crop seed selection system, which solves the technical problem of large air pollution in the process of crop seed selection in the prior art.

[0005] The application discloses a crop seed selection system which comprises a first air screen machine, a specific gravity separator and a second air screen machine, and is characterized in that the first air screen machine, the specific gravity separator and the second air screen machine are detachably connected; the system further comprises a screening device and an air-tight device, the screening device is detachably connected with the first air screen machine, and the screening device is used for separating seeds from seed coats and dust; the screening device comprises an elevator, an air selection mechanism and a cyclone separator, the elevator is arranged on one side close to the first air screen machine, the air selection mechanism is arranged on a side away from the first air screen machine, grains are added into the air selection mechanism, the grains are screened in the air selection mechanism and then enter the elevator, the air selection mechanism is used for separating seed coats and dust in the grains, the cyclone separator is connected with the air selection mechanism, and the cyclone separator is used for separating and collecting the seed coats and dust in the air selection mechanism; the air-tight device is arranged on the first air screen machine, the air-tight device is detachably connected with a discharge port of the elevator, the air-tight device is used for controlling an air inlet of the elevator, so as to adjust the air inlet direction of the air selection mechanism, a fan is connected with a top air outlet of the cyclone separator, and a closed air device is arranged at a bottom discharge port of the cyclone separator.

[0006] The crop seeds are sequentially selected by the screening device, the first air screen machine, the specific gravity separator and the second air screen machine, and the screening device, the first air screen machine, the specific gravity separator and the second air screen machine are modularly arranged.

[0007] The air selection mechanism comprises a huller, a bulk grain tank and a sieve disc assembly, grains are directly added into the huller for processing, the bulk grain tank is arranged on one side of the huller close to the elevator, the bulk grain tank is connected with a discharge port of the huller in communication, a top portion of the bulk grain tank is connected with an air inlet of the cyclone separator in communication, the sieve disc assembly is arranged between the bulk grain tank and the elevator, the grains in the bulk grain tank can enter the elevator through the sieve disc assembly, and the sieve disc assembly is used for separating seed coats in the grains.

[0008] The bulk grain tank is conical, the discharge port of the huller is connected with a middle portion of the bulk grain tank in communication, a screening opening is arranged at a bottom portion of the bulk grain tank, and the grains pass through the screening opening and contact the sieve disc assembly. The bottom portion of the bulk grain tank is arranged in a stepped manner, the grains flow to the screening opening at the bottom portion of the bulk grain tank, and a plurality of air exchange strips are arranged at the bottom portion of the bulk grain tank.

[0009] The sieve assembly includes a motor, a disc chamber, and a circular sieve disc. The motor is fixedly mounted on the elevator. The disc chamber is fixedly connected to the bulk grain box on the side near the elevator. The disc chamber is connected to the screening port. The position on the disc chamber corresponding to the screening port is connected to the feed inlet of the elevator. The circular sieve disc is rotatably disposed in the disc chamber. Grains at the screening port can enter the elevator after passing through the circular sieve disc. The output end of the motor is fixedly connected to the circular sieve disc. When the output end of the motor drives the circular sieve disc to rotate, the tangential direction of the rotation of the circular sieve disc at the screening port is upward.

[0010] The airtight device includes a flared mouth, a material distribution boss, a drive cylinder, and a closed storage bin. The flared mouth is fixedly connected to the discharge port of the elevator. The material distribution boss is fixedly connected to the side of the air screen machine near the elevator. The air screen machine has a through hole around the material distribution boss, which communicates with the interior of the air screen machine. Multiple drive cylinders are fixedly installed on the side of the air screen machine near the elevator. The closed storage bin is fixedly connected to the output end of the multiple drive cylinders and is located between the flared mouth and the material distribution boss.

[0011] The flared opening extends into the top of the enclosed hopper, and the material distribution protrusion extends into the bottom of the enclosed hopper. When the output end of the drive cylinder shortens, the enclosed hopper moves downward, the top of the enclosed hopper fits against the outside of the flared opening, and the bottom of the enclosed hopper fits against the material distribution protrusion.

[0012] When there is a gap between the top of the enclosed hopper and the flared opening, and between the bottom of the enclosed hopper and the distribution protrusion, the bulk grain box can allow gas flow through the flared opening. When the top of the enclosed hopper and the flared opening, and between the bottom of the enclosed hopper and the distribution protrusion, the bulk grain box can allow gas flow through the ventilation strip.

[0013] The beneficial effects of this invention are as follows: In this invention, the modular design of the screening device, air sieve one, gravity sieve, and air sieve two facilitates transportation in practical use and allows for easy replacement of each module according to the application scenario. The air separation mechanism separates the dehulled seeds from their seed coats, while the cyclone separator directly collects the seed coats and dust. The air separation mechanism enhances the effect of the gas flowing through the seed coats and dust by controlling the air inlet, further improving the dust separation efficiency before seed selection and improving air quality. Simultaneously, an airtight device allows for adjustment of the air inlet direction in the air separation mechanism without affecting the seed conveyor's transport of seeds. This application, by adjusting the process of separating the seed coats and dust and changing the airflow direction during seed coat separation, ensures thorough collection of dust and seed coats, reducing their contact with the outside environment and improving air quality. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.

[0015] Fig. 1 This is a schematic diagram of the overall structure of a crop seed selection system according to one embodiment of the present invention; Fig. 2 This is a schematic diagram of the overall structure of the present invention from another perspective; Fig. 3 This is a partial structural diagram of the cooperation between the screening device and the airtight device in this invention; Fig. 4 This is a partial cross-sectional schematic diagram of the internal structure of the bulk grain bin and the circular sieve disc in this invention; Fig. 5 This is a partial cross-sectional schematic diagram of the internal structure of the bulk grain bin and circular sieve plate from another perspective in this invention. Fig. 6 This is a partial cross-sectional view of the internal structure of the airtight device in this invention.

[0016] In the diagram: 1. Air screen one; 2. Gravity separator; 3. Air screen two; 4. Elevator; 5. Cyclone separator; 6. Dehuller; 7. Bulk grain bin; 8. Screening port; 9. Ventilation strip; 10. Motor; 11. Disc bin; 12. Circular screen disc; 13. Trumpet mouth; 14. Material distribution boss; 15. Drive cylinder; 16. Enclosed storage bin; 17. Fan; 18. Airlock. Detailed Implementation

[0017] 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 invention and not intended to limit it.

[0018] To keep the drawings concise, each drawing only schematically shows the parts relevant to the invention; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0019] 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 communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] 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.

[0021] 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 the present invention.

[0022] 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.

[0023] like Figs. 1-6The diagram illustrates a crop seed selection system according to an embodiment of the present invention, comprising a first air sieve 1, a gravity separator 2, and a second air sieve 3. The first air sieve 1, gravity separator 2, and second air sieve 3 are detachably connected. The system also includes a screening device and an airtight device. The screening device is detachably connected to the first air sieve 1 and is used to separate seeds from seed coats and dust. The screening device includes an elevator 4, an air separation mechanism, and a cyclone separator 5. The elevator 4 is located on the side closest to the first air sieve 1, and the air separation mechanism is located on the side furthest from the elevator 4. On one side of machine 1, grain is added to the air separation mechanism. After being screened in the air separation mechanism, the grain enters the elevator 4. The air separation mechanism is used to separate the seed husks and dust from the grain. Cyclone separator 5 is connected to the air separation mechanism and is used to separate and collect the seed husks and dust in the air separation mechanism. An airtight device is installed on the air separation machine 1 and is detachably connected to the discharge port of the elevator 4. The airtight device is used to control the air inlet on the elevator 4, thereby adjusting the air intake direction of the air separation mechanism. The top outlet of the cyclone separator 5... A fan 17 is connected to the cyclone separator 5, and an airlock 18 is installed at the bottom discharge port. Traditional seed selection involves first removing the seed husks and then conveying both the seed husks and the seeds to a screening machine for separation, separating dust from the seed husks. However, this conveying of dust and seed husks affects the air environment. This application changes the traditional workflow by separating the seed husks and the seeds first through the cyclone separator 5 after husk removal. Simultaneously, dust is also separated from the seed husks through the cyclone separator 5. An air separation mechanism is installed to separate the seeds and seed husks simultaneously. The seed shells are turned over to prevent them from accumulating at the bottom of the air separation mechanism, which would make them difficult to separate by the cyclone separator 5. An airtight device is installed to change the air intake direction in the air separation mechanism, which can clean the dust accumulated at the bottom of the air separation mechanism. The seeds conveyed by the elevator 4 are collected in the airtight device. By changing the separation process of the seed shells, dust and seed shells are prevented from flowing with the seeds, resulting in more dust in the air. At the same time, the amount of seed shells conveyed to the air screen 1, gravity separator 2 and air screen 3 is reduced, further improving the efficiency of subsequent seed selection.

[0024] like Figs. 1-2 As shown, crop seeds are sequentially processed through a screening device, a wind sieve 1, a gravity separator 2, and a wind sieve 2 3 for selection. The screening device, wind sieve 1, gravity separator 2, and wind sieve 2 3 are modularly configured. The screening device performs preliminary separation of seed shells and dust to reduce the impact on the air. The subsequent wind sieve 1, gravity separator 2, and wind sieve 2 3 are mainly used to separate jointed barley, oats, light impurities, chaff, sprouted seeds, insect-damaged seeds, moldy seeds, Fusarium head blight, and smut seeds from the seeds. At the same time, large and small impurities are removed. The qualified material is then separated into large, medium, and small particles through screens of different sizes and classified from different outlets. The multi-part modular configuration is effective.

[0025] like Figs. 1-3 As shown, the air separation mechanism includes a huller 6, a bulk grain box 7, and a sieve assembly. Grain is directly added to the huller 6 for processing. The bulk grain box 7 is located on the side of the huller 6 near the elevator 4, and is connected to the discharge port of the huller 6. The top of the bulk grain box 7 is connected to the air inlet of the cyclone separator 5. The sieve assembly is located between the bulk grain box 7 and the elevator 4. Grain in the bulk grain box 7 passes through the sieve assembly and enters the elevator 4. The sieve assembly is used to separate the seed husks from the grain. After the huller 6 removes the husks, the grain enters the bulk grain box 4. In grain bin 7, seeds and seed coats disperse after entering the bulk grain bin 7, and then gather at the bottom of the bulk grain bin 7 when they fall to the bottom. The sieve plate assembly is used to sieve and filter the seed coats. At the same time, when the seeds and seed coats slide at the bottom of the bulk grain bin 7, some dust and seed coats may accumulate at the bottom and cannot flow normally. While sieving the seeds, the sieve plate assembly turns over the seed coats. On the one hand, it prevents the seed coats from accumulating at the bottom of the bulk grain bin 7. Turning over the seed coats makes it easier to separate them through the cyclone separator 5. On the other hand, turning over the seeds and seed coats can prevent the seeds from accumulating at the sieve opening 8.

[0026] like Figs. 1-5 As shown, the bulk grain box 7 is cone-shaped, and the discharge port of the hulling machine 6 is connected to the middle of the bulk grain box 7. The bottom of the bulk grain box 7 is provided with a screening port 8. The grain passes through the screening port 8 and contacts the screen plate assembly. The bottom of the bulk grain box 7 is stepped, and the grain flows from the bottom of the bulk grain box 7 to the screening port 8. Multiple ventilation strips 9 are provided at the bottom of the bulk grain box 7. The bottom of the bulk grain box 7 is stepped, and the ventilation strips 9 are set in the gaps of each step. At the same time, due to the stepped design, the seeds and seed shells can flow from the bottom of the bulk grain box 7 to the screening port 8. The ventilation strips 9 are set with narrow gaps, so the seeds and seed shells cannot flow out through the ventilation strips 9. When the ventilation strips 9 introduce air into the bulk grain box 7, they can drive the dust at the bottom of the bulk grain box 7 to move, which facilitates the collection and separation of dust and seed shells.

[0027] like Figs. 3-5As shown, the screen assembly includes a motor 10, a disc bin 11, and a circular screen disc 12. The motor 10 is fixedly mounted on the elevator 4. The disc bin 11 is fixedly connected to the bulk grain box 7 near the elevator 4. The disc bin 11 is connected to the screening port 8. The position on the disc bin 11 corresponding to the screening port 8 is connected to the feed inlet of the elevator 4. The circular screen disc 12 is rotatably disposed in the disc bin 11. Grains at the screening port 8 can enter the elevator 4 after passing through the circular screen disc 12. The output end of the motor 10 is fixedly connected to the circular screen disc 12. When the output end drives the circular sieve disc 12 to rotate, the tangential direction of the rotation of the circular sieve disc 12 at the sieve opening 8 is upward. The upward rotation of the circular sieve disc 12 at the sieve opening 8 causes the seeds to turn upward, avoiding the accumulation of seeds and seed shells, and also preventing the seed shells from continuing to remain at the bottom of the grain bin 7. At the same time, the circular sieve disc 12 rotates in the disc chamber 11. In actual use, the circular sieve disc 12 can be kept tilted so that the seeds and seed shells come into contact with the circular sieve disc 12 at an angle above the circular sieve disc 12, which can further make the seeds pass through the circular sieve disc 12 more smoothly.

[0028] like Fig. 3 and Fig. 6 As shown, the airtight device includes a flared mouth 13, a distributing boss 14, a drive cylinder 15, and a closed storage bin 16. The flared mouth 13 is fixedly connected to the discharge port of the elevator 4. The distributing boss 14 is fixedly connected to the side of the air screen 1 near the elevator 4. A through hole is provided around the distributing boss 14 on the air screen 1, and the through hole communicates with the interior of the air screen 1. Multiple drive cylinders 15 are fixedly installed on the side of the air screen 1 near the elevator 4. The closed storage bin 16 is fixedly connected to the output end of the multiple drive cylinders 15. The closed storage bin 16 is located between the flared mouth 13 and the distributing boss 14. The seeds output by the elevator 4 are transported to the closed storage bin 16 through the flared mouth 13, and at the same time, the seeds fall onto the distributing boss. After 14, the seeds fall into the air screen machine 1 through the through holes around the distribution boss 14. When the closed storage bin 16 is pulled downward by the output end of the drive cylinder 15, the upper and lower parts of the closed storage bin 16 are respectively attached to the horn mouth 13 and the distribution boss 14. At this time, the seeds lifted upward by the elevator 4 will be transported to the closed storage bin 16 through the horn mouth 13. After the closed storage bin 16 moves upward, there is a gap between the distribution boss 14 and the closed storage bin 16. The seeds can flow into the air screen machine 1 through the gap between the distribution boss 14 and the closed storage bin 16. This allows the seeds transported by the elevator 4 to be temporarily stored in the closed storage bin 16 when the air intake of the screening port 8 is sealed by the closed storage bin 16.

[0029] like Figs. 3-6As shown, the flared opening 13 extends into the top of the enclosed hopper 16, and the distributing protrusion 14 extends into the bottom of the enclosed hopper 16. When the output end of the drive cylinder 15 shortens, the enclosed hopper 16 moves downward, the top of the enclosed hopper 16 fits against the outside of the flared opening 13, and the bottom of the enclosed hopper 16 fits against the distributing protrusion 14. When there is a gap between the top of the enclosed hopper 16 and the flared opening 13, and between the bottom of the enclosed hopper 16 and the distributing protrusion 14, the bulk grain box 7 can allow air to flow through the flared opening 13. When the top of the enclosed hopper 16 fits against the flared opening 13, and the bottom of the enclosed hopper 16 fits against the distributing protrusion 14, the bulk grain... The container 7 allows gas flow through the ventilation strip 9. When the closed hopper 16 is not in contact with the flared opening 13, the blower 17 draws air into the bulk grain container 7 through the cyclone separator 5. The gas enters the bulk grain container 7 through the ventilation strip 9 and the elevator 4. When the gas passes through the circular sieve plate 12, it can drive the seed shells to move towards the top of the bulk grain container 7. When the closed hopper 16 seals the flared opening 13, the air intake of the flared opening 13 is greatly reduced, and the air intake of the ventilation strip 9 is greatly increased. At this time, the gas passes below and turns over the seeds and seed shells in the bulk grain container 7, while carrying away the seed shells and dust accumulated at the bottom, which are collected by the cyclone separator 5.

[0030] In this embodiment, seeds are added to the dehulling machine 6 for dehulling. Seeds, shells, and dust are directly fed into the bulk grain bin 7. Seeds and shells collect at the bottom of the bulk grain bin 7. The output of the motor 10 drives the circular sieve disc 12 to rotate in the disc chamber 11. When seeds and shells come into contact with the circular sieve disc 12, the seeds pass through it. The blower 17 draws gas from the cyclone separator 5 to the outside. At this time, the gas enters the bulk grain bin 7 through the ventilation strip 9 and the screening port 8, carrying the seed shells and dust to the cyclone separator 5 for collection. The collected gas is then discharged through the airlock 18. The seeds are then... After passing through the screening port 8, the grain enters the elevator 4 and is conveyed to the bell mouth 13, falling into the closed storage bin 16 and then entering the air screen 1 for further processing. The dust and seed shells at the bottom of the bulk grain box 7 are cleaned periodically. The output end of the drive cylinder 15 drives the closed storage bin 16 to move downward, contacting the bell mouth 13 and the material distribution boss 14. This reduces the air intake of the bulk grain box 7 through the elevator 4 and screening port 8, and a large amount of gas enters through the ventilation bar 9. The gas moves the seed shells and dust in the bulk grain box 7 from below, thereby cleaning the dust that may have accumulated at the bottom of the bulk grain box 7.

[0031] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention 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 solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A crop seed cleaning system comprising a first air screen (1), a specific gravity separator (2) and a second air screen (3), said first air screen (1), said specific gravity separator (2) and said second air screen (3) being detachably connected, characterized in that, Also include: Screening device, with the wind screen machine one (1) can be detached connection, the screening device is used for separating seed from seed coat, dust, the screening device includes: Elevator (4) is arranged close to one side of the wind screen machine (1); Air separation mechanism, set up in the side of the elevator (4) away from the wind screen machine one (1), the grain is added to the air separation mechanism, the grain is separated in the air separation mechanism and enters into the elevator (4), the air separation mechanism is used for separating the seed coat and dust in the grain; Cyclone separator (5) is communicated with the air separation mechanism, the cyclone separator (5) is used for separating and collecting the seed coat and dust in the air separation mechanism; Air-tight device, set up on the wind screen machine one (1), the air-tight device is detachably connected with the discharge port of the elevator (4), the air-tight device is used for controlling the air inlet of the elevator (4), and then adjusting the air inlet direction of the air separation mechanism.

2. A crop seed culling system according to claim 1, characterised in that, Crop seeds are sequentially selected through the screening device, the wind screen machine one (1), the specific gravity separator (2) and the wind screen machine two (3), and the screening device, the wind screen machine one (1), the specific gravity separator (2) and the wind screen machine two (3) are modularly arranged.

3. A crop seed culling system according to claim 2, characterised in that, The air separation mechanism includes: Decorticator (6), the grain is directly added to the decorticator (6) for processing; Bulk grain tank (7) is arranged on the side of the decorticator (6) close to the elevator (4), the bulk grain tank (7) is communicated with the discharge port of the decorticator (6), the top of the bulk grain tank (7) is communicated with the air inlet of the cyclone separator (5); Screen disc assembly is arranged between the bulk grain tank (7) and the elevator (4), the grain in the bulk grain tank (7) can enter the elevator (4) through the screen disc assembly, and the screen disc assembly is used for separating the seed coat in the grain.

4. A crop seed culling system according to claim 3, wherein, The bulk grain tank (7) is arranged in a conical shape, the discharge port of the decorticator (6) is communicated with the middle part of the bulk grain tank (7), the bottom of the bulk grain tank (7) is provided with a screening port (8), and the grain passes through the screening port (8) and contacts the screen disc assembly.

5. A crop seed culling system according to claim 4, wherein, The bottom of the bulk grain tank (7) is arranged in a stepped shape, the grain flows to the screening port (8) at the bottom of the bulk grain tank (7), and a plurality of air exchange strips (9) are arranged at the bottom of the bulk grain tank (7).

6. A crop seed culling system according to claim 5, wherein, The screen disc assembly includes: Motor (10) is fixedly installed on the elevator (4); Disc bin (11) is fixedly connected on the side of the bulk grain tank (7) close to the elevator (4), the disc bin (11) is communicated with the screening port (8), and the position corresponding to the screening port (8) on the disc bin (11) is communicated with the feeding port of the elevator (4); A circular sieve disc (12) is rotatably arranged in the disc bin (11), and the grain at the sieve opening (8) can enter the elevator (4) after passing through the circular sieve disc (12), and the output end of the motor (10) is fixedly connected with the circular sieve disc (12), and when the output end of the motor (10) drives the circular sieve disc (12) to rotate, the circular sieve disc (12) rotates in the tangential direction of the sieve opening (8) upward.

7. A crop seed culling system according to claim 6, characterised in that, The air-tight device comprises: A horn mouth (13) is fixedly connected at the discharge opening of the elevator (4); A distribution boss (14) is fixedly connected on one side of the air screen machine (1) close to the elevator (4), and a through hole is arranged around the distribution boss (14) on the air screen machine (1), and the through hole is in communication with the inside of the air screen machine (1); A plurality of drive cylinders (15) are fixedly installed on one side of the air screen machine (1) close to the elevator (4); A closed material containing bin (16) is fixedly connected on the output end of the plurality of drive cylinders (15), and the closed material containing bin (16) is arranged between the horn mouth (13) and the distribution boss (14).

8. A crop seed culling system according to claim 7, characterised in that, The horn mouth (13) extends into the top of the closed material containing bin (16), and the distribution boss (14) extends into the bottom of the closed material containing bin (16), and when the output end of the drive cylinder (15) is shortened, the closed material containing bin (16) moves downward, the top of the closed material containing bin (16) is fitted with the outside of the horn mouth (13), and the bottom of the closed material containing bin (16) is fitted with the distribution boss (14).

9. A crop seed culling system according to claim 8, characterised in that, When there is a gap between the top of the closed material containing bin (16) and the horn mouth (13), and between the bottom of the closed material containing bin (16) and the distribution boss (14), the bulk grain box (7) can flow through the horn mouth (13), and when the top of the closed material containing bin (16) is fitted with the horn mouth (13), and the bottom of the closed material containing bin (16) is fitted with the distribution boss (14), the bulk grain box (7) can flow through the air exchange strip (9).

10. A crop seed culling system according to claim 1, wherein, A fan (17) is connected to the top gas outlet of the cyclone separator (5), and a wind blocker (18) is arranged at the bottom discharge opening of the cyclone separator (5).

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