Seed screening device

Abstract

The invention relates to the technical field of screening, and discloses a seed screening device which comprises a shell, a ventilation net is rotationally connected in the shell, a supporting column and a discharging pipe are connected to the lower end of the shell, a feeding pipe is connected to the upper end of the shell, a side pipe is connected to the outer side of the shell, a motor cover is connected into the discharging pipe, and fan blades are rotationally connected to the motor cover. The motor cover is connected with a controller through a cable, the controller is fixedly connected to the lower portion of the shell, a sliding plate is slidably connected to the feeding pipe, and a spring block is connected to the outer side of the feeding pipe. By means of the movable structure of the collecting hopper, seed adding is convenient, quantitative seed adding operation can be achieved through cooperation with the arrangement of the feeding pipe structure, the collecting hopper structure cannot interfere with the adding process during seed adding, automatic seed screening operation can be achieved through cooperation with an external pipeline for conveying and adding seeds, and the working efficiency is improved. And after screening is completed, the seeds can be automatically collected, and follow-up seed screening cannot be disturbed.

Description

Technical Field

[0001] The invention relates to the technical field of screening, and in particular to a seed screening device. Background Art

[0002] Screening is a method of separating particles according to their size, specific gravity, charge, magnetism and other powder properties. Screening is the process of using a perforated sieve to separate mixed materials of different particle sizes into various particle size grades.

[0003] Traditionally, seed screening is generally completed through a sieve. This screening method can screen deformed seeds, but cannot screen seeds with damaged seeds but unchanged outer shell. Nowadays, such seeds are mostly screened through water screening and wind screening. Water screening relies on the good seeds to sink to the bottom of the water, while the bad seeds will float on the water surface to complete the screening. This screening method will affect the seeds to a certain extent. At this time, wind screening provides another screening method. This screening method requires placing the seeds on a platform and relying on the fan under the platform to blow the seeds up. The rising height will be different for seeds of different qualities. This screening method has the least impact on the seeds themselves, but this screening requires manual addition of seeds to the equipment, and it is inconvenient to remove good seeds after screening. Therefore, today's wind screening seed equipment still needs to rely on manual operation, and there is a problem of low degree of automation.

[0004] Based on this, a seed screening device is proposed. Summary of the invention

[0005] The purpose of the present invention is to propose a seed screening device in order to solve the above-mentioned problem.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A seed screening device comprises a shell, a ventilation net is rotatably connected in the shell, a support column and a discharge pipe are connected at the lower end of the shell, a feed pipe is connected at the upper end of the shell, a side pipe is connected at the outer side of the shell, a motor cover is connected in the discharge pipe, a fan blade is rotatably connected on the motor cover, the motor cover is connected to a controller through a cable, the controller is fixedly connected to the lower part of the shell, a slide plate is slidably connected on the feed pipe, a spring block is connected to the outer side of the feed pipe, a connecting strip is connected on one side of the slide plate, a spring 1 is connected between the connecting strip and the spring block, a collecting bucket is slidably connected in the side tube, a receiving interface is provided on the collecting bucket, a synchronous rack is connected to the outer side of the collecting bucket, a synchronous gear is rotatably connected to the outer side of the shell through a rotating shaft, an abutment block and a limit block are connected to the collecting bucket, a spring 2 is connected between the limit block and the side pipe, a traction rope is connected between the limit block and the connecting strip, and a discharging mechanism for first driving the ventilation net to rotate and then driving the collecting bucket to move is connected to the outer side of the shell.

[0007] Preferably, the outer side of the feed pipe is connected with a limit clamp, and the slide plate is slidably connected between the limit clamps.

[0008] Preferably, a fixing strip is connected inside the side tube, a groove is formed at the lower end of the collecting bucket, and the groove at the lower end of the collecting bucket and the fixing strip fit together.

[0009] Preferably, one end of the rotating shaft is connected to a limiting frame, and the synchronous rack is slidably connected to the limiting frame.

[0010] Preferably, a connecting frame is connected to the outer side of the shell, a rotating wheel is rotatably connected to the connecting frame, and a limiting rod is connected to the limiting block.

[0011] Preferably, the unloading mechanism includes a translation block, a connecting plate is connected to the outer side of the shell, an L-shaped groove is provided on the connecting plate, a push rod and a sliding rod are connected to the translation block, one end of the sliding rod is connected to a driving member for driving the sliding rod to slide on the L-shaped groove, a lifting bar is slidably connected to one side of the connecting plate, a flip rack is connected to the outer side of the lifting bar, the lower end of the translation block is slidably connected to the lifting bar, and the ventilation net is connected to a flip gear through an axis.

[0012] Preferably, the driving member comprises a cylinder, the telescopic end of the cylinder is rotatably connected to the sliding rod, and the cylinder is rotatably connected to the connecting plate.

[0013] Preferably, a cam is connected to the outside of the flip gear, a limit plate is connected to the outside of the shell, a lifting rod is slidably connected to the limit plate, an abutment roller is rotatably connected to the upper end of the lifting rod, and a spring three is sleeved on the outside of the lifting rod.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The present application adopts a collecting bucket structure and utilizes a movable structure of the collecting bucket to facilitate seed addition. The setting of the feed pipe structure can realize the operation of quantitative seed addition. When adding seeds, the collecting bucket structure will not interfere with the adding process. The added seeds can be transported by an external pipeline to realize the operation of automatic seed screening. After the screening is completed, the good seeds can also be automatically collected without interfering with the subsequent seed screening.

[0015] 2. The present application adopts a cam structure, and utilizes the cooperation between the cam and the abutment roller to keep the ventilation net structure in a horizontal state during the seed screening process, thereby avoiding the wind force generated by the fan blades from contacting the skewed ventilation net and causing the wind force to skew, thereby interfering with the screening operation, instead of using a flip gear and a flip rack to control the ventilation net to be in a horizontal state. This adjustment method has low control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a screening device according to an embodiment of the present invention is shown; Figure 2 It shows a schematic structural diagram of a synchronous gear connection provided in an embodiment of the present invention; Figure 3 A schematic diagram of the explosion structure at the connection of the collecting bucket provided according to an embodiment of the present invention is shown; Figure 4 A schematic diagram of an exploded structure of a synchronous gear connection provided according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of the structure of a fan blade connection provided by an embodiment of the present invention is shown; Figure 6 It shows a schematic structural diagram of the connection of the connection plate provided in an embodiment of the present invention; Figure 7 A schematic diagram of an exploded structure of a lifting strip connection provided according to an embodiment of the present invention is shown.

[0017] Legend: 1. Shell; 2. Support column; 3. Discharge pipe; 4. Side pipe; 5. Feed pipe; 6. Slide plate; 7. Spring block; 8. Connecting strip; 9. Spring 1; 10. Rotating wheel; 11. Connecting frame; 12. Traction rope; 13. Collecting bucket; 14. Limit block; 15. Limit rod; 16. Spring 2; 17. Synchronous rack; 18. Synchronous gear; 19. Limit frame; 20. Controller; 21. Connecting plate; 22. Limit 1. Position clamp; 23. Fixing bar; 24. Socket; 25. Rotating shaft; 26. Ventilation net; 27. Motor cover; 28. Fan blade; 29. ​​Cylinder; 30. Sliding rod; 31. Abutment block; 32. Flipping gear; 33. Cam; 34. Limiting plate; 35. Lifting rod; 36. Spring three; 37. Abutment roller; 38. L-shaped groove; 39. Translation block; 40. Push rod; 41. Lifting bar; 42. Flipping rack. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 7 , the present invention provides a technical solution: A seed screening device comprises a shell 1, a ventilation net 26 is rotatably connected in the shell 1, and the aperture of the ventilation net 26 is set so that seeds cannot pass through. The lower end of the shell 1 is connected to a support column 2 and a discharge pipe 3, and the support column 2 is used to ensure the stability of the device structure. The upper end of the shell 1 is connected to a feed pipe 5, and the outer side of the shell 1 is connected to a side pipe 4, and two side pipes 4 are provided, and the two side pipes 4 are arranged at different heights, and the side pipes 4 themselves are in a horizontal state. A motor cover 27 is connected in the discharge pipe 3, and the motor cover 27 is fixedly connected in the discharge pipe 3, and is sleeved on the outer side of a rotating motor through the motor cover 27 to protect the rotating motor. The fan blades 28 are rotatably connected to the motor cover 27, and the motor cover 27 is connected to the controller 20 through a cable. The other end of the cable passes through the motor cover 27 and is connected to the rotating motor. The controller 20 is fixedly connected to the bottom of the shell 1. The rotating motor can be controlled to operate by operating the controller 20, and the rotating motor can drive the fan blades 28 to rotate, thereby blowing the seeds on the ventilation net 26 to a high level. A slide plate 6 is slidably connected to the feed pipe 5, and the slide plate 6 is provided with two. When the two slide plates 6 are docked, the feed pipe 5 structure is closed, and the seeds cannot enter the shell 1 from the feed pipe 5. The feed pipe 5 A spring block 7 is connected to the outside, a connecting strip 8 is connected to one side of the slide plate 6, a spring 9 is connected between the connecting strip 8 and the spring block 7, and the slide plates 6 can be pulled to dock with each other through the spring 9 structure to realize the automatic closure of the feed pipe 5. A collecting bucket 13 is slidably connected in the side tube 4. When the seed screening operation is performed, the collecting bucket 13 is staggered in the shell 1. When the seeds are blown up by the fan blades 28, its structure cannot rise vertically. The seeds will contact the lower surface of the collecting bucket 13, and continue to rise along the lower surface of the collecting bucket 13. A receiving interface 24 is provided on the collecting bucket 13, and bad seeds will stop at the fan blades 28. After stopping rotation, it falls and falls into the collecting bucket 13 from the receiving interface 24. The outside of the collecting bucket 13 is connected with a synchronous rack 17. The outside of the shell 1 is rotatably connected with a synchronous gear 18 through a rotating shaft 25. The synchronous rack 17 can mesh with the synchronous gear 18, thereby driving the synchronous gear 18 to rotate. The collecting bucket 13 is connected with an abutment block 31 and a limit block 14. A spring 2 16 is connected between the limit block 14 and the side tube 4. A traction rope 12 is connected between the limit block 14 and the connecting strip 8. The outside of the shell 1 is connected with a unloading mechanism for first driving the ventilation net 26 to rotate and then driving the collecting bucket 13 to move.

[0020] Specifically, Figure 3 As shown, the outer side of the feed pipe 5 is connected with a limit clamp 22, and the slide plate 6 is slidably connected between the limit clamps 22. The limit clamps 22 are provided to limit the structure of the slide plate 6, thereby improving the stability of the horizontal movement of the slide plate 6.

[0021] Specifically, Figure 3As shown, a fixing bar 23 is connected inside the side tube 4, and a groove is provided at the lower end of the collecting bucket 13. The groove at the lower end of the collecting bucket 13 fits with the fixing bar 23. The fixing bar 23 cooperates with the groove at the lower end of the collecting bucket 13, so that the horizontal movement of the collecting bucket 13 is more stable and no structural deviation occurs.

[0022] Specifically, Figure 4 As shown, one end of the rotating shaft 25 is connected to a limiting frame 19, and the synchronous rack 17 is slidably connected to the limiting frame 19. By setting the limiting frame 19, the synchronous rack 17 and the synchronous gear 18 are stably matched, and the limiting frame 19 is clamped on the outside of the two synchronous racks 17.

[0023] Specifically, Figure 2 As shown, a connecting frame 11 is connected to the outside of the shell 1, and a rotating wheel 10 is rotatably connected to the connecting frame 11. A limiting rod 15 is connected to the limiting block 14. By setting the rotating wheel 10 structure, the wear of the traction rope 12 structure is reduced. The traction rope 12 can be wrapped around the rotating wheel 10 to avoid separation between the rotating wheel 10 and the traction rope 12. The spring 16 structure is limited by setting the limiting rod 15.

[0024] Specifically, Figure 5 and Figure 7 As shown, the unloading mechanism includes a translation block 39, a connecting plate 21 is connected to the outside of the shell 1, the upper end of the connecting plate 21 is connected to the lower end of the side tube 4, an L-shaped groove 38 is opened on the connecting plate 21, and a push rod 40 and a slide rod 30 are connected to the translation block 39. The push rod 40 and the slide rod 30 are both vertically connected to the outside of the translation block 39. The push rod 40 and the slide rod 30 are parallel to each other. One end of the slide rod 30 is connected to a driving member for driving the slide rod 30 to slide on the L-shaped groove 38, wherein the slide rod 30 slides strictly according to the structure of the L-shaped groove 38. A lifting bar 41 is slidably connected to one side of the connecting plate 21. The lifting bar 41 structure can only be lifted vertically, and a flip rack 42 is connected to the outside of the lifting bar 41. The flip rack 42 can mesh with the flip gear 32 after moving, the lower end of the translation block 39 is slidably connected to the lifting bar 41, and the ventilation net 26 is connected to the flip gear 32 through an axis, and the axis is rotatably connected to the shell 1, wherein the ventilation net 26 is arranged in the shell 1, and the flip gear 32 is arranged on the outside of the shell 1. As for the cooperation between the flip rack 42 and the flip gear 32, the meshing state cannot ensure the close cooperation between the structures, that is, there is still a certain gap at the meshing point between the actual flip rack 42 and the flip gear 32. The setting of the gap can improve the stability of the structural transmission, but this structure will also lead to a decrease in accuracy, so this method is not used to control the ventilation net 26 to be in a horizontal state.

[0025] Specifically, Figure 4 and Figure 5As shown, the driving member includes a cylinder 29, the telescopic end of the cylinder 29 is rotatably connected to the slide bar 30, and the cylinder 29 is rotatably connected to the connecting plate 21. The slide bar 30 can be driven to slide on the L-shaped groove 38 by the extension and contraction of the cylinder 29.

[0026] Specifically, Figure 7 As shown, a cam 33 is connected to the outside of the flip gear 32, and a limit plate 34 is connected to the outside of the shell 1. A lifting rod 35 is slidably connected to the limit plate 34. The upper end of the lifting rod 35 is rotatably connected to a contact roller 37. A spring 36 is sleeved on the outside of the lifting rod 35, and the lifting rod 35 cannot rotate. The cross-section of the lower end of the shell 1 is square, and there is a problem of incomplete material discharge. The fan blade 28 can be opened and the flip gear 32 can be manually rotated to change part of the wind direction. By blowing, the seeds are blown into the discharge pipe 3, thereby completing the collection.

[0027] To sum up, the seed screening device provided in the present embodiment needs to place the seeds in a feed pipe 5 in order to screen out good seeds in the seeds, wherein a slide plate 6 is slidably connected to the feed pipe 5, and a conical receiving groove is provided on the upper surface of the slide plate 6. This structure can achieve a faster feeding effect, wherein two slide plates 6 are provided. When the two slide plates 6 are away from each other, the seeds placed in the feed pipe 5 will fall freely into the shell 1, thereby relying on the screening device to complete the seed screening operation.

[0028] When screening is needed, the operator needs to start the cylinder 29, and use the cylinder 29 to shrink and pull the slide bar 30 to slide on the L-shaped groove 38. In the initial state, the slide bar 30 is set at the lowest point. At this time, the slide bar 30 rises in height, and the slide bar 30 drives the lifting bar 41 to rise in height. At this time, the flip rack 42 set on one side of the flip gear 32 rises in height until the flip gear 32 and the flip rack 42 are engaged with each other. When the lifting bar 41 continues to rise in height, the flip rack 42 will drive the flip gear 32 to rotate. At the same time, the cam 33 structure fixedly connected to the flip gear 32 also starts to rotate, and the abutment roller 37 rolling in contact with the outer side of the cam 33 decreases in height, and the spring three 36 structure is compressed. The flip gear 32 is fixedly connected to the ventilation net 26 through an axis. When the ventilation net 26 rotates synchronously with the flip gear 32, the seeds above the ventilation net 26 will fall into the discharge pipe 3 to complete the collection. When the flip rack 42 rises to separate from the flip gear 32, the flip gear 32 completes a 180° rotation. When the slide bar 30 rises vertically to the highest point, the flip rack 42 is completely separated from the flip gear 32. At this time, the abutment roller 37 abuts against the recessed part of the cam 33 to stabilize the rotation state of the cam 33, wherein the cam 33 is an outer contour structure of a figure eight, and there are two recessed parts on the outside of the structure. When the abutment roller 37 abuts against the recessed part, the ventilation net 26 structure is in a horizontal state.

[0029] When the cylinder 29 structure continues to contract, the slide bar 30 begins to move horizontally, the lifting bar 41 stops rising in height, and the flip rack 42 remains in position. At this time, the lower end of the translation block 39 begins to slide along the lifting bar 41, and the push rod 40 that moves horizontally synchronously pushes the abutment block 31 to move, thereby driving the collection bucket 13 to move horizontally, and the moving direction is the direction away from the shell 1. When the collection bucket 13 moves, the synchronous rack 17 cooperates with the synchronous gear 18 to drive another synchronous rack 17 to move in the direction away from the shell 1, thereby driving another collection bucket 13 to move. At this time, the spring 2 16 structure is stretched, and the traction rope 12 is used to synchronously pull the connecting bar 8, wherein the traction rope 12 is not in a taut state, that is, when the collection bucket 13 starts to move, it can pull one end of the traction rope 12 to move, but it does not The slide plate 6 structure connected to the other end of the traction rope 12 is not driven to move. Only when the receiving interface 24 of the collecting bucket 13 just completely enters the side tube 4, the traction rope 12 is in a taut state. When the collecting bucket 13 continues to be moved, the slide plate 6 structure moves synchronously to realize the opening of the feed pipe 5, so that the seeds placed above the slide plate 6 in advance can fall freely onto the ventilation net 26. Since the collecting bucket 13 structure enters the side tube 4, the fallen seeds will not enter the receiving interface 24. The seeds fall freely from the center of the upper end of the shell 1, which reduces the probability of the seeds falling into the side tube 4. When the seeds fall into the side tube 4, they can be pushed out and fall on the ventilation net 26 by resetting the collecting bucket 13. After the slide plate 6 is fully opened, the cylinder 29 shrinks to the maximum distance, and the collecting bucket 13 moves horizontally to the maximum distance away from the shell 1.

[0030] Then the cylinder 29 begins to extend, and the feed pipe 5 structure is closed for the first time, and the two slide plates 6 are pulled by the spring 19 structure to complete the re-docking, and then the collecting bucket 13 is reset under the action of the spring 216 structure, wherein the side tubes 4 are provided with two, and the two side tubes 4 have different heights. When the collecting bucket 13 is reset to the limit block 14 abutting against the outer side of the side tube 4, the collecting bucket 13 structure is reset at this time, and the collecting bucket 13 is inserted into the shell 1, so that the cavity structure of the collecting bucket 13 in the shell 1 is in a "Z" shape, and the lower surface of one end of the collecting bucket 13 inserted into the shell 1 is in an inclined state. When the cylinder 29 extends to the slide bar 30 sliding to the horizontal part of the L-shaped groove 38 closest to one end of the shell 1, the cylinder 29 stops running, and the operator needs to operate the controller 20 to make the fan blades 28 arranged in the discharge pipe 3 start to rotate, wherein the fan blades 28 are connected to the output end of the rotating motor, and the rotating motor structure is arranged in the motor cover 27, and the rotating motor is connected to the controller 20 through a cable. The motor cover 27 is provided to protect the rotating motor and prevent seeds from falling into the rotating motor and causing interference. The fan blades 28 are rotated to generate vertical upward wind force to blow up the seeds. Unsaturated seeds or bad seeds will be different from good seeds in quality, and thus the heights blown up by the same wind force are different. The bad seeds will continue to rise over the collecting bucket 13 due to their higher rising height. When the fan blades 28 stop rotating, the bad seeds will fall into the receiving interface 24, while the good seeds will continue to stay on the ventilation net 26, thereby completing the screening of the seeds. A retractable corrugated pipe is connected to one end of the collecting bucket 13, and the bad seeds can be collected along the pipe. After the screening is completed, the cylinder 29 structure continues to extend, so that the flip rack 42 cooperates with the flip gear 32 to realize the flipping of the ventilation net 26. Each time different batches of seeds are screened, the ventilation net 26 will complete two flips to prevent seeds from adhering to the ventilation net 26 and interfering with subsequent screening operations.

[0031] The screening device can realize efficient seed screening operations, realize the operation of automatically adding seeds into the shell 1, limit the mass of the screened seeds added to the device at a single time, and avoid increasing the screening burden of the device due to a large number of seed screenings. The fan blade 28 structure stops rotating when the cylinder 29 is running. The fan blade 28 can be set to stop rotating when the cylinder 29 is running, and when the fan blade 28 starts to rotate, the cylinder 29 stops extending and retracting, thereby realizing automated seed screening operations and greatly improving the seed screening efficiency.

[0032] The above description of the embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A seed screening device, comprising a housing (1), characterized in that: A ventilation net (26) is rotatably connected inside the shell (1), a support column (2) and a discharge pipe (3) are connected to the lower end of the shell (1), a feed pipe (5) is connected to the upper end of the shell (1), a side pipe (4) is connected to the outer side of the shell (1), a motor cover (27) is connected inside the discharge pipe (3), a fan blade (28) is rotatably connected to the motor cover (27), the motor cover (27) is connected to a controller (20) via a cable, the controller (20) is fixedly connected to the lower side of the shell (1), a slide plate (6) is slidably connected to the feed pipe (5), a spring block (7) is connected to the outer side of the feed pipe (5), a connecting strip (8) is connected to one side of the slide plate (6), and the connecting strip (8) is connected to the spring block (7). A spring 1 (9) is connected between the spring blocks (7); a collecting bucket (13) is slidably connected inside the side tube (4); a receiving interface (24) is provided on the collecting bucket (13); a synchronous rack (17) is connected to the outside of the collecting bucket (13); a synchronous gear (18) is rotatably connected to the outside of the housing (1) via a rotating shaft (25); an abutment block (31) and a limit block (14) are connected to the collecting bucket (13); a spring 2 (16) is connected between the limit block (14) and the side tube (4); a traction rope (12) is connected between the limit block (14) and the connecting bar (8); and a material discharge mechanism is connected to the outside of the housing (1) for first driving the ventilation net (26) to rotate and then driving the collecting bucket (13) to move.

2. A seed screening device according to claim 1, characterized in that: The outer side of the feed pipe (5) is connected to a limit clamp (22), and the slide plate (6) is slidably connected between the limit clamps (22).

3. A seed screening device according to claim 1, characterized in that: A fixing strip (23) is connected inside the side tube (4), and a groove is provided at the lower end of the collecting bucket (13), and the groove at the lower end of the collecting bucket (13) and the fixing strip (23) fit together.

4. A seed screening device according to claim 1, characterized in that: One end of the rotating shaft (25) is connected to a limiting frame (19), and the synchronous rack (17) is slidably connected to the limiting frame (19).

5. A seed screening device according to claim 1, characterized in that: The outer side of the housing (1) is connected to a connecting frame (11), a rotating wheel (10) is rotatably connected to the connecting frame (11), and a limiting rod (15) is connected to the limiting block (14).

6. A seed screening device according to claim 1, characterized in that: The unloading mechanism comprises a translation block (39), the outer side of the shell (1) is connected to a connecting plate (21), the connecting plate (21) is provided with an L-shaped groove (38), the translation block (39) is connected to a push rod (40) and a slide rod (30), one end of the slide rod (30) is connected to a driving member for driving the slide rod (30) to slide on the L-shaped groove (38), one side of the connecting plate (21) is slidably connected to a lifting bar (41), the outer side of the lifting bar (41) is connected to a flip rack (42), the lower end of the translation block (39) is slidably connected to the lifting bar (41), and the ventilation net (26) is connected to a flip gear (32) via a shaft.

7. A seed screening device according to claim 6, characterized in that: The driving member comprises a cylinder (29), the telescopic end of the cylinder (29) is rotatably connected to the slide rod (30), and the cylinder (29) is rotatably connected to the connecting plate (21).

8. A seed screening device according to claim 6, characterized in that: The outer side of the flip gear (32) is connected to a cam (33), the outer side of the housing (1) is connected to a limit plate (34), a lifting rod (35) is slidably connected to the limit plate (34), the upper end of the lifting rod (35) is rotatably connected to an abutment roller (37), and a spring three (36) is sleeved on the outer side of the lifting rod (35).

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