Seedling culture screening device for rice planting

Abstract

A seedling culture screening device for rice planting belongs to the technical field of agricultural planting, and comprises a feeding mechanism, a discharge port, a shell discharge box, a first-layer screening plate, a second-layer screening plate and a paving mechanism, the discharge port is located on one side of the bottom of the feeding mechanism, and the shell discharge box is mounted in the middle of one side of the feeding mechanism in an intercommunication manner; when the seedling culture screening device for rice planting works, the flattening mechanism moves back and forth above the first-layer screening plate through the linear motor, rice seeds stacked on the first-layer screening plate in a concentrated mode are flattened, and the situations of screening leakage and incomplete screening caused by local stacking are avoided; meanwhile, a pore pressure device drives a movable frame to rotate and move up and down through a connecting plate and a hydraulic cylinder to press and dredge rice seeds blocked in round holes in a layer of screening plate, the workload of frequent shutdown cleaning and the cleaning frequency of manual intervention due to rice seed blockage of the equipment can be reduced, the continuous screening duration of the equipment is guaranteed, and the working efficiency is improved. And the operation efficiency of equipment is improved.

Description

Technical Field

[0001] This invention relates to the field of agricultural planting technology, specifically to a seedling screening device for rice cultivation. Background Technology

[0002] Pre-seed screening of rice seeds can eliminate seeds of different varieties and weeds, ensuring varietal purity, avoiding competition and mixed traits in the field, and facilitating unified management. Screening for plump, undamaged seeds with sufficient endosperm nutrition can improve germination rate and bud vigor, reduce missing seedlings and gaps in rows, and lay the foundation for uniform and robust seedlings. Removing diseased, insect-infested, and shriveled seeds can reduce the incidence of seedling diseases (such as bakanae disease) and pests, reducing pesticide use and lowering planting costs and risks. Simultaneously, it provides high-quality seed sources for subsequent seedling cultivation, transplanting, and rice growth and development, helping to improve rice's stress resistance and providing a solid foundation for ultimately increased yield and quality.

[0003] In the screening process before rice seedling cultivation, rice seeds are uneven in size, and some seeds are prone to sticking together due to moisture. This can easily clog the sieve holes or feed inlet of the vibrating screen, causing the equipment to stop frequently for cleaning, interrupting the screening process, and reducing work efficiency. Moreover, most vibrating screens can only separate impurities and seeds, and cannot achieve graded screening based on the plumpness and size of the rice seeds. Different quality seeds need to be sorted manually a second time, which increases labor costs and makes it difficult to accurately distinguish between high-quality and low-quality seeds, affecting the uniformity and quality of seedlings in subsequent seedling cultivation.

[0004] To address the above problems, a seedling screening device for rice cultivation is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a seedling screening device for rice cultivation, which solves the problems mentioned above.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a rice seedling screening device, comprising a feeding mechanism, a discharge port, a hull discharge box, a first-layer screening plate, a second-layer screening plate, and a leveling mechanism. The discharge port is located on one side of the bottom of the feeding mechanism, and the hull discharge box is installed in the middle of one side of the feeding mechanism. A first-layer screening plate is provided at the bottom of the feeding mechanism. One end of the discharge port is close to the midpoint of the first-layer screening plate. A second-layer screening plate is provided at the bottom of the first-layer screening plate. A leveling mechanism for screening and leveling rice seeds is slidably installed above the first-layer screening plate. The first-layer screening plate includes a motor housing two fixedly installed on one side of the bottom end, and a lead screw extends from one end of the motor housing two. The output end of the lead screw is fixedly sleeved with a rotating ring. A groove is opened on the surface of the rotating ring, and a top rod is inserted inside the groove. The top rod is located below the middle of the bottom rod, and collars are equidistantly sleeved on the outside of the bottom rod. A fixing rod is fixedly connected above the collars at both ends.

[0007] The leveling mechanism includes a hydraulic cylinder mounted on one side of the upper part, and a piston rod is movably connected to one side of the hydraulic cylinder. One end of the piston rod is fixedly connected to a rod block. A collar is provided on one side of the rod block, and a movable frame is sleeved on the outside of the collar. Two sets of collars in the middle are installed at both ends of a connecting rod. The connecting rod is located between the leveling mechanism and the hydraulic cylinder.

[0008] Furthermore, the feeding mechanism has a side opening of the same size as the discharge box on one side, and a semi-enclosed feeding port is provided above the feeding mechanism. The inside of the feeding port is inclined on both sides. A fan is provided below one side of the closed part of the feeding port, and a motor housing is installed at one end of the fan. The motor housing is located on the side of the feeding mechanism.

[0009] Furthermore, the first-layer screening plate is installed in the middle of the surface of the plate frame, and the two ends of the first-layer screening plate are close to the top of the plate frame. The first-layer screening plate is connected to the second-layer screening plate through the plate frame. Several round holes are opened on both sides of the midpoint of the first-layer screening plate, and the round holes of the first-layer screening plate are slightly larger than the round holes of the second-layer screening plate.

[0010] Furthermore, the motor housing is fixedly installed on one side of the plate frame, and the top of the fixing rod is equipped with an installation plate connected to the bottom of the first layer of screening plate. Side grooves are opened on both sides of the plate frame, and baffles are installed on the edges of the side grooves. One end of the baffle is located below the discharge port.

[0011] Furthermore, side frames are fixedly installed on both sides of the leveling mechanism, and the bottom end of the side frame is located inside the side groove. The leveling mechanism is provided in two sets, one of which is installed at an angle near the discharge port, and a gap is reserved between the leveling mechanism and the surface of the first layer of screening plate.

[0012] Furthermore, the hydraulic cylinder is installed inside the equipment box on one side, and the equipment box is fixedly installed on the surface of the leveling mechanism. The bottom of the piston rod is provided with a groove, which is opened at the bottom of the equipment box. The movable frame is inserted into the inside of the groove, and a bottom plate with the same groove is provided below the equipment box.

[0013] Furthermore, a connecting plate is provided in the middle of the interior of the leveling mechanism, and a collar is also installed on one side of the connecting plate. The connecting plate is movably connected to the piston rod through the collar and the movable frame.

[0014] Furthermore, the connecting plate includes a pressing plate connected to the bottom, and the pressing plate is installed in the middle of the interior of the leveling mechanism. The bottom of the pressing plate is provided with a plurality of perforated pressure devices. The bottom of the perforated pressure device is conical, and the top of the perforated pressure device is connected with a spring column. The positions of the perforated pressure devices and the circular holes opened on the surface of the first layer of screening plate correspond one-to-one.

[0015] Furthermore, a device plate is provided below the second-layer screening plate, and support frames are fixedly installed on both sides of the first-layer screening plate, and a bottom frame is installed in the middle of the support frames, with the bottom frame located in the middle below the device plate.

[0016] Furthermore, a linear motor is symmetrically installed on one side of the first-layer screening plate, and a motor rod is connected to one side of the linear motor, with one end of the motor rod connected to one side of the side frame.

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

[0018] 1. When the rice seedling screening device is in operation, the first screening plate moves back and forth through the rotation of the top rod in the groove inside the rotating ring. The rice seeds above the screening plate are graded and screened layer by layer by the shaking amplitude. Below the first screening plate, there is a second screening plate and a device plate. The device plate removes substandard rice seeds. The first and second screening plates can screen the seeds in layers, improve the quality of rice seedlings, optimize the yield of rice seeds, and reduce the differences in field growth caused by uneven seed quality.

[0019] 2. When the rice seedling screening device is in operation, the leveling mechanism moves back and forth above the first screening plate via a linear motor, leveling the rice seeds piled up on the first screening plate to avoid missed screening or incomplete screening caused by local accumulation. At the same time, the hole presser drives the movable frame to rotate and move up and down through the connecting plate and hydraulic cylinder to press and clear the rice seeds that are blocked in the round holes inside the first screening plate. This can reduce the workload of frequent machine shutdowns for cleaning due to rice seed blockage and the frequency of manual intervention, ensuring the continuous screening time of the equipment and improving the operating efficiency of the equipment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the lower structure of the two-layer screening plate of the present invention;

[0022] Figure 3 This is a schematic diagram of the paving mechanism structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the lower structure of the connecting plate of the present invention;

[0024] Figure 5 This is a schematic diagram of the left side structure of the paving mechanism of the present invention;

[0025] Figure 6 This is a schematic diagram of the internal structure of the feeding mechanism of the present invention;

[0026] Figure 7This is a schematic diagram of the structure of a single-layer screening plate of the present invention;

[0027] Figure 8 This is a schematic diagram of the bottom structure of the single-layer screening plate of the present invention;

[0028] Figure 9 This is a schematic diagram of the plate and frame structure of the present invention;

[0029] Figure 10 This is a schematic diagram of the feeding mechanism of the present invention from the right side.

[0030] In the diagram: 1. Feeding mechanism; 11. Side opening; 12. Feed inlet; 13. Fan; 14. Motor box one; 2. Discharge outlet; 3. Exhaust box; 4. First layer screening plate; 41. Plate frame; 42. Motor box two; 43. Lead screw; 44. Rotary ring; 45. Top rod; 46. Bottom rod; 47. Collar; 48. Fixed rod; 49. Mounting plate; 410. Side groove; 411. Baffle; 5. Second layer screening plate; 6. Leveling mechanism; 61. Side frame; 62. Equipment box; 63. Hydraulic cylinder; 64. Piston rod; 65. Rod block; 66. Movable frame; 67. Shaft collar; 68. Connecting rod; 69. Connecting plate; 6901. Pressing plate; 6902. Hole presser; 6903. Spring column; 610. Base plate; 7. Device plate; 8. Linear motor; 9. Support frame; 10. Bottom frame. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," 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.

[0033] The purpose of this embodiment is to provide a seedling screening device for rice cultivation, including a feeding mechanism 1, a discharge port 2, a hulling box 3, a first-layer screening plate 4, a second-layer screening plate 5, and a leveling mechanism 6. The feeding mechanism 1 has a side opening 11 of the same size as the hulling box 3 on one side, and a semi-enclosed feeding port 12 is provided above the feeding mechanism 1. The two sides inside the feeding port 12 are inclined. A fan 13 is provided below one side of the closed part of the feeding port 12, and a motor housing 14 is installed at one end of the fan 13. The motor housing 14 is located on the side of the feeding mechanism 1.

[0034] In the above invention, the rice seeds to be screened are fed into the inside of the feeding mechanism 1 through the inlet 12. The empty rice seeds are selected by the fan 13 to remove light impurities, broken leaves and empty grains, etc., and the rice seeds are initially optimized.

[0035] For details of this invention, please refer to the following: Figure 7 , Figure 8 , Figure 9 As shown, the discharge port 2 is located on one side of the bottom of the feeding mechanism 1, and the discharge box 3 is installed in the middle of one side of the feeding mechanism 1. A screening plate 4 is provided at the bottom of the feeding mechanism 1. One end of the discharge port 2 is close to the midpoint of the screening plate 4. The screening plate 4 includes a motor box 42 fixedly installed on one side of the bottom end. A lead screw 43 extends from one end of the motor box 42. The output end of the lead screw 43 is fixedly sleeved with a rotating ring 44. A groove is opened on the surface of the rotating ring 44. A top rod 45 is inserted inside the groove. The top rod 45 is located below the middle of the bottom rod 46. A collar 47 is equidistantly sleeved on the outside of the bottom rod 46. A fixing rod 48 is fixedly connected above the collars 47 at both ends.

[0036] In this invention, a first-layer screening plate 4 is installed in the middle of the surface of the plate frame 41, and the two ends of the first-layer screening plate 4 are close to the top of the plate frame 41. The first-layer screening plate 4 is connected to the second-layer screening plate 5 through the plate frame 41. Several round holes are opened on both sides of the midpoint of the first-layer screening plate 4, and the round holes of the first-layer screening plate 4 are slightly larger than the round holes of the second-layer screening plate 5. The motor housing 42 is fixedly installed on one side of the plate frame 41, and the top of the fixing rod 48 is equipped with a mounting plate 49 connected to the bottom of the first-layer screening plate 4. Side grooves 410 are opened on both sides of the plate frame 41, and baffles 411 are installed on the edge of the side grooves 410. One end of the baffle 411 is located below the discharge port 2.

[0037] In the above invention, the first-layer screening plate 4 and the second-layer screening plate 5 use the size of the internal round holes to classify rice seeds into superior and inferior grades, avoiding competition for nutrients between weak seedlings and strong seedlings, and also avoiding the problem of inconsistent growth rates of rice seeds. The first-layer screening plate 4 moves back and forth through the bottom top rod 45 in the groove inside the rotating ring 44, which can not only disperse the rice grains piled up above, but also perform tiered screening of rice seeds, allowing qualified rice grains to be reserved in the corresponding screening layer to adapt to different growth needs.

[0038] For details of this invention, please refer to the following: Figure 3 and Figure 4 As shown, a second layer of screening plates 5 is provided at the bottom of the first layer of screening plates 4, and a leveling mechanism 6 for screening and leveling rice seeds is slidably installed above the first layer of screening plates 4. The leveling mechanism 6 includes a hydraulic cylinder 63 installed on one side of the upper part, and a piston rod 64 is movably connected to one side of the hydraulic cylinder 63. One end of the piston rod 64 is fixedly connected to a rod block 65. A collar 67 is provided on one side of the rod block 65, and a movable frame 66 is sleeved on the outside of the collar 67. The two sets of collars 67 in the middle are installed at both ends of a connecting rod 68, which is located between the leveling mechanism 6 and the hydraulic cylinder 63.

[0039] Preferably, side frames 61 are fixedly installed on both sides of the leveling mechanism 6, and the bottom end of the side frames 61 is located inside the side groove 410. The leveling mechanism 6 is provided in two sets, one of which is installed at an angle near the discharge port 2. A gap is reserved between the leveling mechanism 6 and the surface of the first layer of screening plate 4. The hydraulic cylinder 63 is installed inside the equipment box 62, and the equipment box 62 is fixedly installed on the surface of the leveling mechanism 6. The bottom of the piston rod 64 is provided with a groove. The groove is opened at the bottom of the equipment box 62, and the movable frame 66 is inserted into the groove. A bottom plate 610 with the same groove is provided below the equipment box 62.

[0040] Preferably, a connecting plate 69 is provided in the middle of the interior of the leveling mechanism 6, and a collar 67 is also installed on one side of the connecting plate 69. The connecting plate 69 is movably connected to the piston rod 64 through the collar 67 and the movable frame 66. The connecting plate 69 includes a pressing plate 6901 connected to the bottom, and the pressing plate 6901 is installed in the middle of the interior of the leveling mechanism 6. A plurality of perforated pressure devices 6902 are provided at the bottom of the pressing plate 6901. The bottom of the perforated pressure device 6902 is conical, and the top of the perforated pressure device 6902 is connected to a spring column 6903. The positions of the perforated pressure device 6902 and the circular holes opened on the surface of the first layer of screening plate 4 correspond one-to-one.

[0041] In the above invention, the leveling mechanism 6 moves back and forth above the first-layer screening plate 4 to level the rice grains accumulated at the outlet. The hydraulic cylinder 63 drives the piston rod 64 to reciprocate, causing the movable frame 66 connected to the piston rod 64 to drive the bottom connecting plate 69 to rise and fall. When the connecting plate 69 descends, the bottom spring column 6903 is opened, and the conical bottom of the orifice presser 6902 penetrates the round hole inside the first-layer screening plate 4 to clear the rice seeds blocked in the first-layer screening plate 4, so that the rice seeds can be continuously screened for a long time, and the efficiency of rice grain screening is also guaranteed.

[0042] For details of this invention, please refer to the following: Figure 1 and Figure 2 As shown, a device plate 7 is provided below the second-layer screening plate 5, and support frames 9 are fixedly installed on both sides of the first-layer screening plate 4. A bottom frame 10 is installed in the middle of the support frame 9. The bottom frame 10 is located in the middle below the device plate 7. A linear motor 8 is symmetrically installed on one side of the first-layer screening plate 4, and a motor rod is connected to one side of the linear motor 8. One end of the motor rod is connected to one side of the side frame 61.

[0043] In the above invention, the linear motor 8 causes the leveling mechanism 6 to slide inside the side groove 410 through the motor rod, gradually leveling the rice grains above the screening plate 4 so that all rice grains can be screened one by one, while the device plate 7 can use the substandard products for other needs.

[0044] In summary, the working principle of the present invention is as follows: First, the rice seeds to be screened are poured into the inside of the feeding mechanism 1 through the inlet 12. The inside of the inlet 12 is inclined on both sides, which reduces the opening range of the inlet 12 and controls the flow rate of rice seeds in the inlet 12. When the rice seeds fall into the inside of the feeding mechanism 1, the side fan 13 rotates through the motor box 14 to blow out the empty shells and impurities in the rice seeds from the side box opening 11, while the rice husks containing the rice seeds fall into the inside of the feeding mechanism 1 and are discharged from the outlet 2. The rear of the outlet 2 is inclined, which can prevent the rice seeds from accumulating and being difficult to discharge.

[0045] After the rice seeds are discharged from outlet 2, they accumulate on one side above the first-layer screening plate 4. The leveling mechanism 6 slides on the surface of the first-layer screening plate 4 via a motor rod and a linear motor 8, gradually leveling the rice seeds above the first-layer screening plate 4. During leveling, the leveling mechanism 6 near outlet 2 is installed at an angle, with a larger distance between it and the first-layer screening plate 4. This prevents the leveling mechanism 6 from pushing the accumulated rice seeds in the opposite direction when moving towards outlet 2. The angled leveling mechanism 6 also moves the accumulated rice seeds along with it, allowing the two sets of leveling mechanisms 6 to level the rice seeds from different directions. During operation, the hydraulic cylinder 63 drives the piston rod 64 to extend and retract. The piston rod 64 is movably connected to the movable frame 66 via the rod block 65. The bottom end of the movable frame 66 is connected to the connecting plate 69 via the collar 67. The connecting plate 69 moves up and down through the movement of the movable frame 66 and the hydraulic cylinder 63, which drives the bottom hole pressure device 6902 to move up and down together. When the connecting plate 69 is pressed down by force, the hole pressure device 6902 cooperates with the spring column 6903 to press down and clear the round holes inside the first layer of screening plate 4, so that the blocked rice can pass through the round holes smoothly for secondary screening, ensuring the continuity of equipment screening.

[0046] The rice seeds are gradually spread out above the first screening plate 4, allowing them to fully contact the round holes for screening. During screening, a rotating ring 44 with grooves rotates in conjunction with a lead screw 43. The top rod 45 inside the groove moves back and forth according to the rotation of the groove, causing the bottom rod 46 connected to the top rod 45 to drive the first screening plate 4 to move back and forth slightly, achieving the purpose of shaking the screening plate 4 to screen the rice seeds. There are two sets of screening plates. The size of the round holes inside the screening plates is set to grade the rice seeds according to their quality. The graded rice seeds have similar growth cycles and growth requirements, which is conducive to harvesting the rice seeds together. The bottom device plate 7 can be used to store inferior rice seeds for other uses.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A seedling screening device for rice cultivation, comprising a feeding mechanism (1), a discharge port (2), a hull discharge box (3), a first-layer screening plate (4), a second-layer screening plate (5), and a leveling mechanism (6), characterized in that: The discharge port (2) is located on one side of the bottom of the feeding mechanism (1), and a shell discharge box (3) is installed in the middle of one side of the feeding mechanism (1). A layer of screening plate (4) is provided at the bottom of the feeding mechanism (1). One end of the discharge port (2) is close to the midpoint of the first layer of screening plate (4). A second layer of screening plate (5) is provided at the bottom of the first layer of screening plate (4). A leveling mechanism (6) for rice seed screening and leveling is slidably installed above the first layer of screening plate (4). The first layer of screening plate (4) includes A motor housing 2 (42) is fixedly installed on one side of the bottom end, and a lead screw (43) extends from one end of the motor housing 2 (42). The output end of the lead screw (43) is fixedly connected to the rotating ring (44), and a wire groove is opened on the surface of the rotating ring (44). A top rod (45) is inserted inside the wire groove. The top rod (45) is located below the middle of the bottom rod (46), and collars (47) are equidistantly sleeved on the outside of the bottom rod (46). A fixing rod (48) is fixedly connected above the collars (47) at both ends. The leveling mechanism (6) includes a hydraulic cylinder (63) mounted on one side of the upper part, and a piston rod (64) is movably connected to one side of the hydraulic cylinder (63). One end of the piston rod (64) is fixedly connected to a rod block (65). A collar (67) is provided on one side of the rod block (65), and a movable frame (66) is sleeved on the outside of the collar (67). Two sets of collars (67) in the middle are installed at both ends of a connecting rod (68), which is located between the leveling mechanism (6) and the hydraulic cylinder (63).

2. The rice seedling screening device according to claim 1, characterized in that: The feeding mechanism (1) has a side opening (11) of the same size as the discharge box (3) on one side, and a semi-closed feeding port (12) is provided above the feeding mechanism (1). The two sides inside the feeding port (12) are inclined. A fan (13) is provided below one side of the closed part of the feeding port (12), and a motor box (14) is installed at one end of the fan (13). The motor box (14) is located on the side of the feeding mechanism (1).

3. The rice seedling screening device according to claim 1, characterized in that: The first-layer screening plate (4) is installed in the middle of the surface of the plate frame (41), and the two ends of the first-layer screening plate (4) are close to the top of the plate frame (41). The first-layer screening plate (4) is connected to the second-layer screening plate (5) through the plate frame (41). Several round holes are opened on both sides of the midpoint of the first-layer screening plate (4), and the round holes of the first-layer screening plate (4) are slightly larger than the round holes of the second-layer screening plate (5).

4. The rice seedling screening device according to claim 3, characterized in that: The motor housing (42) is fixedly installed on one side of the plate frame (41), and the top of the fixing rod (48) is equipped with an installation plate (49) connected to the bottom of the first layer of screening plate (4). Side grooves (410) are provided on both sides of the plate frame (41), and baffles (411) are installed on the edge of the side grooves (410). One end of the baffle (411) is located below the discharge port (2).

5. The rice seedling screening device according to claim 1, characterized in that: The leveling mechanism (6) is fixedly installed with side frames (61) on both sides, and the bottom end of the side frame (61) is located inside the side groove (410). The leveling mechanism (6) is provided in two sets, one of which is installed at an angle near the discharge port (2), and a gap is reserved between the leveling mechanism (6) and the surface of the first layer of screening plate (4).

6. The rice seedling screening device according to claim 5, characterized in that: The hydraulic cylinder (63) is installed inside the equipment box (62) on one side, and the equipment box (62) is fixedly installed on the surface of the leveling mechanism (6). The bottom of the piston rod (64) is provided with a groove, which is opened at the bottom of the equipment box (62). The movable frame (66) is inserted into the inside of the groove. The bottom of the equipment box (62) is provided with a bottom plate (610) with the same groove.

7. The rice seedling screening device according to claim 5, characterized in that: The leveling mechanism (6) has a connecting plate (69) in the middle, and a collar (67) is also installed on one side of the connecting plate (69). The connecting plate (69) is movably connected to the piston rod (64) through the collar (67) and the movable frame (66).

8. The rice seedling screening device according to claim 7, characterized in that: The connecting plate (69) includes a pressing plate (6901) connected to the bottom, and the pressing plate (6901) is installed in the middle of the interior of the leveling mechanism (6). The bottom of the pressing plate (6901) is provided with a plurality of hole pressers (6902). The bottom of the hole presser (6902) is conical, and the top of the hole presser (6902) is connected with a spring column (6903). The hole presser (6902) and the circular holes opened on the surface of the screening plate (4) correspond one-to-one.

9. The rice seedling screening device according to claim 1, characterized in that: A device plate (7) is provided below the second-layer screening plate (5), and a support frame (9) is fixedly installed on both sides of the first-layer screening plate (4), and a bottom frame (10) is installed in the middle of the support frame (9), the bottom frame (10) being located in the middle below the device plate (7).

10. A seedling screening device for rice cultivation according to claim 5, characterized in that: A linear motor (8) is symmetrically installed on one side of the first layer screening plate (4), and a motor rod is connected to one side of the linear motor (8), and one end of the motor rod is connected to one side of the side frame (61).

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