Seed screening device for seedling culture

Abstract

The seed screening device comprises a first seed screening module, a second seed screening module and a third seed screening module, and the first seed screening module comprises a seed screening motor, a seed screening lead screw, a seed screening bearing seat and a seed screening supporting column; the second seed screening module comprises a seed screening top plate, a seed screening frame, a seed screening middle plate, a seeding plate and a seed screening bottom plate which are stacked in sequence; seed through holes are formed in the seed screening frame, the seed screening middle plate and the seeding plate; the third seed screening module comprises a seed screening bottom stand column and a seed screening bottom stand column sliding block, the seed screening bottom stand column sliding block is in sliding connection with the seed screening bottom stand column, the seed screening bottom stand column sliding block is connected with the second seed screening module, the whole second seed screening module is driven to move downwards when the seed screening motor works, and sowing holes are formed in soil. Seeds in the seed screening frame sequentially pass through the seed through holes in the seed screening middle plate and the seed through holes in the seeding plate and then enter the seeding holes.

Description

Technical Field

[0001] The utility model belongs to the technical field of seedling cultivation and sowing, and particularly relates to a seed screening device for seedling cultivation. Background Art

[0002] Vegetables are an indispensable part of our daily lives. They are not only delicious but also nutritious. To increase survival rates, vegetable growers must first raise seedlings in large-scale planting areas. Seedlings are then transplanted when they reach 15 to 20 centimeters in height. Traditional seedling raising methods involve manually digging pits in protected areas and then sowing seeds to cultivate the seedlings. This sowing method is inefficient and labor-intensive, making it difficult to meet the needs of large-scale agricultural production. Existing sowing equipment is complex and expensive to manufacture. A common type of sowing machine is a centrifugal spreader, which deposits seeds onto the sowing plot. It is attached to the rear of an agricultural transport vehicle and consists of a seed hopper and a spreader wheel. Seeds fall from the hopper onto the spreader wheel, where they are spread tangentially under centrifugal force, with a sowing width of 8 to 12 meters. Powdered or granular fertilizers, lime, and other materials can also be spread. The spreader can also be mounted on agricultural aircraft. However, due to the rotation of the sowing wheel, this sowing method can cause seeds to not be planted in the desired location, resulting in seed waste. At the same time, when sowing in small areas, such as experimental fields, the traditional method is still manual sowing.

[0003] During use, existing sowing equipment often requires manual screening of seeds through manual seed selection before sowing. The sowing method using a rotating sowing wheel often results in a large amount of seed waste, which increases production costs. Therefore, it is becoming increasingly important to be able to screen seeds by machine before sowing and to complete sowing in specific locations at the same time. The traditional seedling raising process relies entirely on manual operation, and the cost of manual labor is about 500 yuan per acre, which is relatively expensive. Affected by individual differences in manual labor, the quality of seedlings varies, resulting in poor seedling quality. It takes 25 hours of manual labor to complete the breeding of seeds per acre, and the planting efficiency is extremely low. Therefore, in order to effectively improve sowing efficiency and save sowing costs, a highly efficient, economical, and environmentally friendly machine that combines vegetable seedling screening and sowing has great application prospects. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems and provide a seed screening device which has a simple structure, is easy to operate and can screen seeds according to seed size.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a seed screening device for seedling cultivation, comprising a first seed screening module, a second seed screening module and a third seed screening module, the first seed screening module comprising a seed screening motor, a seed screening screw rod, a seed screening bearing seat and a seed screening pillar, the rotating shaft end of the seed screening motor is connected to the seed screening screw rod through a coupling, the seed screening bearing seat is sleeved on the seed screening screw rod, and the end of the seed screening screw rod is connected to the end of the seed screening pillar; the second seed screening module comprises a seed screening top plate, a seed screening frame, a seed screening middle plate, a sowing plate and a seed screening bottom plate stacked in sequence, the seed screening frame, the seed screening middle plate and the sowing plate are all provided with seed through holes, the top of the seed screening top plate is connected to the bottom of the seed screening pillar, and the seed screening top plate is respectively connected to the screen by bolts The seed screening middle plate is connected to the seed screening bottom plate, and a seed screening frame motor is provided on the seed screening bottom plate, and the seed screening frame motor is connected to the seed screening frame through a connecting rod mechanism, and a seed screening top plate sliding member is provided at the bottom of the seed screening top plate, and the seed screening top plate sliding member is connected to the seed screening frame, and the seed screening frame motor drives the seed screening frame to move along the seed screening top plate sliding member when working; the seed screening third module includes a seed screening bottom column and a seed screening bottom column slider, the seed screening bottom column slider is slidably connected to the seed screening bottom column, and the seed screening bottom column slider is connected to the seed screening second module, and the seed screening motor drives the entire seed screening second module to move downward when working to form a sowing hole in the soil, and the seeds inside the seed screening frame pass through the seed screening middle plate and the seed through holes in the sowing plate in turn and enter the sowing hole.

[0006] Preferably, the connecting rod mechanism includes a first connecting rod of the screen seed frame, a second connecting rod of the screen seed frame, a first connecting shaft of the screen seed frame and a second connecting shaft of the screen seed frame. The rotating shaft end of the screen seed frame motor passes through the end of the first connecting rod of the screen seed frame, and the other end of the first connecting rod of the screen seed frame is connected to the end of the second connecting rod of the screen seed frame through the first connecting shaft of the screen seed frame. The other end of the second connecting rod of the screen seed frame is connected to the screen seed frame through the second connecting shaft of the screen seed frame. When the screen seed frame motor is working, it drives the screen seed frame to move.

[0007] Preferably, the seed screening top plate sliding member includes a top plate sliding base, a top plate sliding rail and a top plate sliding block. The top plate sliding base is connected to the seed screening top plate, the top plate sliding rail is fixedly connected to the top plate sliding base, the top plate sliding block is slidingly connected to the top plate sliding rail, and the other side of the top plate sliding block is fixedly connected to the seed screening frame, and the seed screening frame can move along the top plate sliding rail.

[0008] Preferably, a seed screening bottom plate motor is provided on the seed screening bottom plate, a seed screening bottom plate connecting rod mechanism is provided on the seed screening bottom plate motor, the bottom plate connecting rod mechanism is connected to the sowing plate, and the seed screening bottom plate motor drives the sowing plate to move through the seed screening bottom plate connecting rod mechanism.

[0009] Preferably, the seed screening bottom plate linkage mechanism comprises a seed screening bottom plate first rod, a seed screening bottom plate second rod, a seed screening bottom plate first connecting shaft, a seed screening bottom plate second connecting shaft and a seed screening bottom plate connecting block, the rotating shaft end of the seed screening bottom plate motor is connected with the end of the seed screening bottom plate first rod, the other end of the seed screening bottom plate first rod is connected with the end of the seed screening bottom plate second rod through the seed screening bottom plate first connecting shaft, the other end of the seed screening bottom plate second rod is connected with the seed screening bottom plate connecting block through the seed screening bottom plate second connecting shaft, the bottom of the seed screening bottom plate connecting block is connected with the seeding plate, and the seeding plate is driven to move by the seed screening bottom plate first rod, the seed screening bottom plate second rod and the seed screening bottom plate connecting block in sequence when the seed screening bottom plate motor works.

[0010] Preferably, the top of the seed screening top plate is provided with a seed screening top plate connecting plate, the seed screening top plate connecting plate is a cross-shaped plate structure, and the seed screening top plate connecting plate is connected with the end of the seed screening support.

[0011] Preferably, an angle code is arranged between the seed screening top plate connecting plate and the seed screening support, the two ends of the angle code are connected with the seed screening top plate connecting plate and the seed screening support respectively, and the number of the angle codes is four, which are arranged at the bottoms of the four sides of the seed screening support.

[0012] Preferably, the seed screening bottom plate is a long plate structure, the long side end face of the seed screening bottom plate is outwardly protruded to form a seed screening bottom plate protrusion, the seed screening bottom plate protrusion and the seed screening bottom plate form a stepped structure, and the two sides of the seeding plate are located on the seed screening bottom plate protrusion.

[0013] Preferably, the bottom face of the seeding plate is provided with a plurality of insertion hole cones, the insertion hole cones are conical structures and are arranged in an array on the bottom of the seeding plate.

[0014] The seed screening device has the advantages that:

[0015] 1. The seed screening device for seedling cultivation is driven by the seed screening frame motor to realize the reciprocating movement of the seed screening frame, and the seeding plate is driven by the seed screening bottom plate motor to move, so that the seed screening purpose is achieved, and the effect is faster than manual seed screening.

[0016] 2. The seed screening device drives the seeding plate to move to form seed pits on the ground, so that the sowing is completed in the seed screening process, and the function integration degree is high.

[0017] 3. The seed screening device controls the alternating movement of the seed screening frame, the seed screening middle plate and the seeding plate, so that the seeds in the seed screening frame enter the sowing pits formed by the seeding plate in the soil through the seed holes in the seed screening frame, the seed screening plate and the seeding plate in sequence, the efficiency of seed screening and sowing is high, and the operation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a seed screening device for seedling cultivation according to the present invention;

[0019] Figure 2 This is a structural diagram of the first module of the screen type of the utility model;

[0020] Figure 3 This is a structural diagram of the second module of the screen of the utility model;

[0021] Figure 4 This is a structural diagram of the seed screening frame of the utility model;

[0022] Figure 5 This is an exploded schematic diagram of the structure of the seed screening frame, seed screening middle plate and sowing plate of the utility model;

[0023] Figure 6 This is a schematic diagram of the bottom structure of the seeding plate of the utility model;

[0024] Figure 7 It is a schematic diagram of the lateral structure of the seeding plate of the utility model.

[0025] Explanation of reference numerals: 1. first screening module; 2. second screening module; 3. third screening module; 10. screening motor; 11. screening screw rod; 12. screening bearing seat; 13. screening support; 21. screening top plate; 22. screening frame; 23. screening middle plate; 24. sowing plate; 25. screening bottom plate; 26. seed through hole; 27. screening bottom plate connector; 31. screening bottom column; 32. screening bottom column slider; 210. top plate sliding base; 211. top plate sliding rail; 21 2. Top plate sliding block; 213. Screen seed top plate connecting plate; 214. Angle code; 241. Jack cone; 250. Screen seed frame motor; 251. Screen seed frame first connecting rod; 252. Screen seed frame second connecting rod; 253. Screen seed frame first connecting shaft; 254. Screen seed frame second connecting shaft; 260. Screen seed bottom plate motor; 261. Screen seed bottom plate first rod; 262. Screen seed bottom plate second rod; 263. Screen seed bottom plate first connecting shaft; 264. Screen seed bottom plate second connecting shaft; 265. Screen seed bottom plate connecting block. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0027] like Figures 1 to 7As shown, the utility model provides a seed screening device for seedling cultivation, including a first seed screening module 1, a second seed screening module 2 and a third seed screening module 3. The first seed screening module 1 includes a seed screening motor 10, a seed screening screw rod 11, a seed screening bearing seat 12 and a seed screening pillar 13. The rotating shaft end of the seed screening motor 10 is connected to the seed screening screw rod 11 through a coupling, the seed screening bearing seat 12 is sleeved on the seed screening screw rod 11, and the end of the seed screening screw rod 11 is connected to the end of the seed screening pillar 13. The second seed screening module 2 includes a seed screening top plate 21, a seed screening frame 22, a seed screening middle plate 23, a sowing plate 24 and a seed screening bottom plate 25 stacked in sequence. The seed screening frame 22, the seed screening middle plate 23 and the sowing plate 24 are all provided with seed through holes 26. The top of the seed screening top plate 21 is connected to the bottom of the seed screening pillar 13, and the seed screening top plate 21 is connected to the seed screening middle plate 23 and the seed screening bottom plate 25 by bolts respectively. A seed screening frame motor 250 is provided on the seed screening bottom plate 25, and the seed screening frame motor 250 is connected to the seed screening frame 22 through a connecting rod mechanism. A seed screening top plate sliding part is provided at the bottom of the seed screening top plate 21, and the seed screening top plate sliding part is connected to the seed screening frame 22. When the seed screening frame motor is working, it drives the seed screening frame 22 to move along the seed screening top plate sliding part. The third seed screening module 3 includes a seed screening bottom column 31 and a seed screening bottom column slider 32. The seed screening bottom column slider 32 is slidably connected to the seed screening bottom column 31, and the seed screening bottom column slider 32 is connected to the seed screening second module 2. When the seed screening motor 10 is working, it drives the entire seed screening second module 2 to move downward to form a sowing hole in the soil. The seeds inside the seed screening frame 22 pass through the seed screening middle plate 23 and the seed through hole 26 in the sowing plate 24 in turn and enter the sowing hole.

[0028] The seed screening pillar 13 is a columnar structure. The upper end of the seed screening pillar 13 is provided with a seed screening pillar threaded hole. The end of the seed screening screw 11 cooperates with the seed screening pillar threaded hole, so that when the seed screening screw 11 rotates, the seed screening pillar 13 moves up and down synchronously.

[0029] The seed screen bearing seat 12 is in a "J"-shaped structure. The bottom of the seed screen bearing seat 12 is provided with a seed screen bearing seat through hole. The number of the seed screen bearing seat through holes is two. Bolts pass through the seed screen bearing seat through holes to connect with existing equipment, thereby increasing the stability of the entire equipment. In this embodiment, the existing equipment is equipment related to breeding, such as a bracket.

[0030] In this embodiment, after the seed screening bearing seat 12 is fixed in position, the rotating shaft end of the seed screening motor 10 rotates when the seed screening motor 10 is in operation. The seed screening motor 10 is connected to the seed screening screw 11 through a coupling, and a thrust bearing is installed in the bearing seat 12. The entire weight of the seed screening second module 2 and the seed screening first module 1 rests on the bearing seat 12. When the seed screening motor 10 is in operation, the seed screening screw 11 passes through the thrust bearing installed in the bearing seat 12, allowing the rotational motion to proceed normally.

[0031] The connecting rod mechanism includes a first connecting rod 251 for the screen seed frame, a second connecting rod 252 for the screen seed frame, a first connecting shaft 253 for the screen seed frame and a second connecting shaft 254 for the screen seed frame. The rotating shaft end of the screen seed frame motor 250 passes through the end of the first connecting rod 251 for the screen seed frame, and the other end of the first connecting rod 251 for the screen seed frame is connected to the end of the second connecting rod 252 for the screen seed frame through the first connecting shaft 253 for the screen seed frame, and the other end of the second connecting rod 252 for the screen seed frame is connected to the screen seed frame 22 through the second connecting shaft 254 for the screen seed frame. When the screen seed frame motor 250 is working, it drives the screen seed frame 22 to move.

[0032] In this embodiment, the rotating shaft end of the screen frame motor 250 is fixedly connected to the first connecting rod 251 of the screen frame, the first connecting shaft 253 of the screen frame is rotatably connected to the first connecting rod 251 of the screen frame and the second connecting rod 252 of the screen frame respectively, the second connecting rod 252 of the screen frame is rotatably connected to the second connecting shaft 254 of the screen frame, and the end of the second connecting shaft 254 of the screen frame extends into the screen frame 22 and is sleeved with a nut.

[0033] The seed screening top plate sliding member includes a top plate sliding base 210, a top plate sliding rail 211, and a top plate sliding block 212. The top plate sliding base 210 is connected to the seed screening top plate 21, the top plate sliding rail 211 is fixedly connected to the top plate sliding base 210, and the top plate sliding block 212 is slidably connected to the top plate sliding rail 211. The other side of the top plate sliding block 212 is fixedly connected to the seed screening frame 22, and the seed screening frame 22 can move along the top plate sliding rail 211. There are two seed screening top plate sliding members, which are distributed in parallel on both sides of the seed screening top plate 21. The seed screening top plate sliding members ensure that the seed screening frame 22 moves smoothly along the top plate sliding rail 211.

[0034] A seed screening bottom plate motor 260 is provided on the seed screening bottom plate 25, and a seed screening bottom plate connecting rod mechanism is provided on the seed screening bottom plate motor 260. The seed screening bottom plate connecting rod mechanism is connected to the sowing plate 24, and the seed screening bottom plate motor 260 drives the sowing plate 24 to move through the seed screening bottom plate connecting rod mechanism.

[0035] The seed screening base connecting rod mechanism includes a first seed screening base rod 261, a second seed screening base rod 262, a first connecting shaft 263, a second connecting shaft 264 and a seed screening base connecting block 265. The rotating shaft end of the seed screening base motor 260 is connected to the end of the first seed screening base rod 261, and the other end of the first seed screening base rod 261 is connected to the end of the second seed screening base rod 262 through the first seed screening base rod 263. The other end of the second seed screening base rod 262 is connected to the seed screening base connecting block 265 through the second seed screening base rod 264. The bottom of the seed screening base connecting block 265 is connected to the sowing plate 24. When the seed screening base motor 260 is working, it drives the sowing plate 24 to move through the first seed screening base rod 261, the second seed screening base rod 262 and the seed screening base connecting block 265 in sequence.

[0036] The rotating shaft end of the seed screening base motor 260 is fixedly connected to the end of the first seed screening base rod 261. The first seed screening base rod 261 and the second seed screening base rod 262 are respectively rotatably connected to the first seed screening base connecting shaft 263. The second seed screening base rod 262 and the seed screening base connecting block 265 are respectively rotatably connected to the second seed screening base connecting shaft 264. Thus, when the seed screening base motor 260 is in operation, the reciprocating motion of the sowing plate 24 is ultimately achieved through the first seed screening base rod 261, the second seed screening base rod 262 and the seed screening base connecting block 265.

[0037] A seed screen top plate connecting plate 213 is provided on the top of the seed screen top plate 21 . The seed screen top plate connecting plate 213 is a cross-shaped plate structure. The seed screen top plate connecting plate 213 is connected to the end of the seed screen support 13 .

[0038] An angle code 214 is provided between the seed screen top plate connecting plate 213 and the seed screen pillar 13. The two ends of the angle code 214 are respectively connected to the seed screen top plate connecting plate 213 and the seed screen pillar 13. There are four angle codes 214, which are respectively located at the bottom of the four sides of the seed screen pillar 13.

[0039] The seed screening base plate 25 is a long plate-shaped structure. The long side end surface of the seed screening base plate 25 protrudes outward to form a seed screening base plate protrusion. The seed screening base plate protrusion and the seed screening base plate 25 form a step structure. The two sides of the sowing plate 24 are located on the seed screening base plate protrusion. During the movement process, the sowing plate 24 moves along the direction of the step structure.

[0040] The seed screening bottom plate 25 is provided with a seed screening bottom plate connector 27. There are four seed screening bottom plate connectors 27, which are distributed at the four corners of the seed screening bottom plate 25. The seed screening bottom plate connector 27 is a plate-shaped bending structure with a "U"-shaped cross section. The end of the seed screening bottom plate 25 is located inside the seed screening bottom plate connector 27 and is connected by bolts. The outside of the seed screening bottom plate connector 27 is fixedly connected to the seed screening bottom column slider 32 by bolts, and the seed screening bottom column slider 32 can only move up and down along the seed screening bottom column 31. There are four seed screening third modules 3, which are located at the four corners of the seed screening bottom plate 25. The structure connected to the seed screening bottom column slider 32 by the seed screening bottom plate connector 27 makes it possible for the seed screening bottom plate 25 to move smoothly when the seed screening bottom plate 25 moves up and down due to the guiding effect of the seed screening bottom column 31 on the seed screening bottom column slider 32.

[0041] The bottom surface of the sowing plate 24 is provided with a jack cone 241, which is a cone structure and is distributed in an array at the bottom of the sowing plate 24. The seed through holes on the sowing plate 24 are also distributed in an array and are spaced apart from the jack cone 241.

[0042] In this embodiment, seed holes 26 are distributed in an array on the seed screen frame 22, the seed screen intermediate plate 23, and the sowing plate 24. The seed holes 26 are elliptical in shape, through which seeds to be sown pass. In actual use, the shape and size of the seed holes 26 can be specifically adjusted according to the size and shape of the seeds to be sown to ensure smoother passage of the seeds.

[0043] During use, the seed screening frame 22 is filled with seeds to be sown. The seed holes 26 on the seed screening frame 22, the seed screening intermediate plate 23, and the sowing plate 24 are all staggered. The seed screening motor 10 drives the seed screening support 13 downward, causing the jack cones 241 to form an array of sowing pits in a designated area of ​​the soil. The seed screening motor 10 then reverses, lifting the sowing plate 24. The seed screening frame motor 250 then drives the seed screening frame 22 back and forth to screen the seeds, causing them to fall onto the seed screening intermediate plate 23. The seed holes on the seed screening intermediate plate 23 and the sowing plate 24 are now misaligned. The seed screening base plate motor 260 then drives the sowing plate 24 to move, aligning the seed holes 26 on the seed screening intermediate plate 23 and the sowing plate 24. The seeds then fall into the sowing pits for sowing. This utility model performs both seed screening and sowing operations simultaneously, significantly saving both seed breeding time and labor costs.

[0044] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the scope of protection of the present invention is not limited to such specific descriptions and embodiments. Those skilled in the art can, based on the technical teachings disclosed in this utility model, make various other specific variations and combinations that do not depart from the essence of the present invention, and such variations and combinations are still within the scope of protection of the present invention.

Claims

1. A seed screening device for seedling cultivation, characterized in that: The invention comprises a first seed screening module (1), a second seed screening module (2) and a third seed screening module (3), wherein the first seed screening module (1) comprises a seed screening motor (10), a seed screening screw rod (11), a seed screening bearing seat (12) and a seed screening support (13), wherein the rotating shaft end of the seed screening motor (10) is connected to the seed screening screw rod (11) through a coupling, the seed screening bearing seat (12) is sleeved on the seed screening screw rod (11), and the end of the seed screening screw rod (11) is connected to the end of the seed screening support (13). The second seed screening module (2) comprises a seed screening top plate (21), a seed screening frame (22), a seed screening middle plate (23), a seeding plate (24) and a seed screening bottom plate (25) stacked in sequence, the seed screening frame (22), the seed screening middle plate (23) and the seeding plate (24) are all provided with seed through holes (26), the top of the seed screening top plate (21) is connected to the bottom of the seed screening support (13), and the seed screening top plate (21) is respectively connected to the seed screening middle plate (23) and the seed screening bottom plate (25) by bolts. The seed screening bottom plate (25) is connected to the seed screening bottom plate (25), and a seed screening frame motor (250) is provided on the seed screening bottom plate (25), and the seed screening frame motor (250) is connected to the seed screening frame (22) through a connecting rod mechanism. A seed screening top plate sliding member is provided at the bottom of the seed screening top plate (21), and the seed screening top plate sliding member is connected to the seed screening frame (22). When the seed screening frame motor is working, the seed screening frame (22) is driven to move along the seed screening top plate sliding member; the seed screening third module (3) includes a seed screening bottom column (31) and a seed screening The seeding bottom column slider (32) is connected to the seeding bottom column (31) in a sliding manner, and the seeding bottom column slider (32) is connected to the seeding second module (2). When the seeding motor (10) is working, it drives the entire seeding second module (2) to move downward, forming a seeding hole in the soil, and the seeds inside the seeding frame (22) pass through the seeding middle plate (23) and the seed through hole (26) in the seeding plate (24) in turn and enter the seeding hole.

2. A seed screening device for seedling cultivation according to claim 1, characterized in that: The connecting rod mechanism comprises a first connecting rod (251) of the seed screening frame, a second connecting rod (252) of the seed screening frame, a first connecting shaft (253) of the seed screening frame and a second connecting shaft (254) of the seed screening frame. The rotating shaft end of the seed screening frame motor (250) passes through the end of the first connecting rod (251) of the seed screening frame. The other end of the first connecting rod (251) of the seed screening frame is connected to the end of the second connecting rod (252) of the seed screening frame via the first connecting shaft (253) of the seed screening frame. The other end of the second connecting rod (252) of the seed screening frame is connected to the seed screening frame (22) via the second connecting shaft (254) of the seed screening frame. When the seed screening frame motor (250) is working, the seed screening frame (22) is driven to move.

3. A seed screening device for seedling cultivation according to claim 1, characterized in that: The seed screening top plate sliding member comprises a top plate sliding base (210), a top plate sliding rail (211) and a top plate sliding block (212); the top plate sliding base (210) is connected to the seed screening top plate (21); the top plate sliding rail (211) is fixedly connected to the top plate sliding base (210); the top plate sliding block (212) is slidably connected to the top plate sliding rail (211); the other side of the top plate sliding block (212) is fixedly connected to the seed screening frame (22); and the seed screening frame (22) can move along the top plate sliding rail (211).

4. A seed screening device for seedling cultivation according to claim 1, characterized in that: The seed screening bottom plate (25) is provided with a seed screening bottom plate motor (260). The seed screening bottom plate motor (260) is provided with a seed screening bottom plate connecting rod mechanism. The seed screening bottom plate connecting rod mechanism is connected to the sowing plate (24). The seed screening bottom plate motor (260) drives the sowing plate (24) to move through the seed screening bottom plate connecting rod mechanism.

5. The seed screening device for seedling cultivation according to claim 1, characterized in that: The seed screening bottom plate connecting rod mechanism comprises a seed screening bottom plate first rod (261), a seed screening bottom plate second rod (262), a seed screening bottom plate first connecting shaft (263), a seed screening bottom plate second connecting shaft (264) and a seed screening bottom plate connecting block (265); the rotating shaft end of the seed screening bottom plate motor (260) is connected to the end of the seed screening bottom plate first rod (261); the other end of the seed screening bottom plate first rod (261) is connected to the seed screening bottom plate second connecting shaft (264) via the seed screening bottom plate first connecting shaft (263). The ends of the rod (262) are connected, the other end of the second rod (262) of the seed screening bottom plate is connected to the seed screening bottom plate connecting block (265) through the second connecting shaft (264) of the seed screening bottom plate, and the bottom of the seed screening bottom plate connecting block (265) is connected to the sowing plate (24). When the seed screening bottom plate motor (260) is working, it drives the sowing plate (24) to move through the first rod (261) of the seed screening bottom plate, the second rod (262) of the seed screening bottom plate and the seed screening bottom plate connecting block (265) in sequence.

6. A seed screening device for seedling cultivation according to claim 1, characterized in that: A seed screen top plate connecting plate (213) is provided on the top of the seed screen top plate (21). The seed screen top plate connecting plate (213) is a cross-shaped plate structure. The seed screen top plate connecting plate (213) is connected to the end of the seed screen support (13).

7. A seed screening device for seedling cultivation according to claim 6, characterized in that: An angle code (214) is provided between the seed screen top plate connecting plate (213) and the seed screen pillar (13), and the two ends of the angle code (214) are respectively connected to the seed screen top plate connecting plate (213) and the seed screen pillar (13). There are four angle codes (214) located at the bottom of the four surfaces of the seed screen pillar (13).

8. The seed screening device for seedling cultivation according to claim 1, characterized in that: The seed screening bottom plate (25) is a long plate-shaped structure. The long side end surface of the seed screening bottom plate (25) protrudes outward to form a seed screening bottom plate protrusion. The seed screening bottom plate protrusion and the seed screening bottom plate (25) form a stepped structure. The two sides of the sowing plate (24) are located on the seed screening bottom plate protrusion.

9. The seed screening device for seedling cultivation according to claim 1, characterized in that: The bottom surface of the sowing plate (24) is provided with a plug-in cone (241), which is a cone structure and is distributed in an array shape on the bottom of the sowing plate (24).

Images