A seed screening apparatus and method for alfalfa breeding

Abstract

The application discloses a seed screening device and method for alfalfa breeding, and relates to the technical field of screening devices. The seed screening device for alfalfa breeding comprises a screening box internally provided with a fan, the top and bottom of the screening box are respectively provided with a feeding hopper and a first material port, and further comprises: an inclined plate arranged in a slanting manner and arranged in the screening box and located below the feeding hopper, a plurality of strip-shaped grooves are arranged on the inclined plate at equal intervals; a protective cover arranged at the bottom of the screening box, the lower end of the first material port extends into the protective cover, a screen is arranged in the protective cover, a second material port is formed in the bottom of the protective cover, and a shaking part for driving the protective cover to reciprocatingly lift and lower is arranged on the screening box. Through the arrangement of the strip-shaped plate, part of impurities on the seeds can be removed, the removed light impurities are easy to be discharged from the screening box along with the airflow, the quality of the subsequent seeds is improved, and the requirement of high-purity breeding materials can be better met.

Description

Technical Field

[0001] This invention relates to the field of screening equipment technology, specifically to a seed screening device and method for alfalfa breeding. Background Technology

[0002] In alfalfa breeding, the harvested seed material is often mixed with various impurities such as seed coats, straw fragments, dust, and shriveled grains. In order to obtain high-purity breeding seeds, a bellows-type screening device is usually used for separation: by adjusting the appropriate wind speed and screen mesh size, the plump and heavy standard seeds fall into the collection port under the action of gravity, while the lighter impurities are carried by the airflow to the discharge end, thus achieving the initial separation of seeds and impurities.

[0003] However, in actual screening operations, it was found that light impurities such as dust, lint, broken seed coats, and shriveled seeds attached to the seed surface tend to adhere tightly to plump standard seeds due to electrostatic adsorption or surface adhesion. These impurities then enter the discharge port along with the standard seeds. This adhesion phenomenon prevents the airflow from effectively blowing away these impurities, resulting in a large number of fine impurities still being mixed in with the alfalfa seeds obtained after screening by the bellows equipment. This significantly reduces the overall purity and quality of the seeds, making it difficult to meet the requirements for high-purity breeding materials. Summary of the Invention

[0004] This invention provides a seed screening device for alfalfa breeding. By setting up strip plates, some impurities on the seeds can be removed. The removed light impurities are easily discharged from the screening box with the airflow, improving the quality of subsequent seeds and making it easier to meet the requirements of high-purity breeding materials. This solves the problem mentioned in the background art of the inclusion of a large number of fine impurities, which reduces the purity and quality of seeds.

[0005] This invention provides the following technical solution: A seed screening device for alfalfa breeding includes a screening box with a fan installed inside. The top and bottom of the screening box are respectively provided with a feeding hopper and a first feeding port. It also includes: an inclined plate disposed inside the screening box and located below the feeding hopper, the inclined plate having a plurality of equally spaced strip grooves; a protective cover disposed at the bottom of the screening box, the lower end of the first feeding port extending into the protective cover, a screen disposed inside the protective cover, a second feeding port opening at the bottom of the protective cover, and a shaking part on the screening box for driving the protective cover to reciprocate up and down.

[0006] As a preferred embodiment of the present invention, the inclined plate is provided with a slot, and a plurality of equally spaced strips are connected in the slot, the gap between two adjacent strips forming the strip groove.

[0007] As a preferred embodiment of the present invention, two pulleys are rotatably installed inside the protective cover, and the screen is sleeved on the two pulleys in the form of a belt. The screen is made of rubber, and the outer wall of the screen is provided with filter holes arranged at equal intervals. A conveying motor that drives one of the pulleys to rotate is installed on the outer wall of the protective cover. A guide trough extending to the outer wall is fixedly connected inside the protective cover, and the guide trough is disposed through the belt-shaped screen.

[0008] As a preferred embodiment of the present invention, the shaking part includes a horizontal shaft rotatably connected to the bottom of the screening box, a crankshaft fixedly mounted on the horizontal shaft, a push rod rotatably connected to the crankshaft, the other end of the push rod being rotatably connected to the top of the protective cover, the protective cover being longitudinally slidably mounted on the bottom of the screening box, and the horizontal shaft being connected to the mounting shaft of the fan via a chain drive assembly.

[0009] As a preferred embodiment of the present invention, the strip-shaped component includes a crossbeam fixedly connected in a slot, with transverse grooves on both sides of the crossbeam, and a transverse plate slidably installed in each of the two transverse grooves. A transversely arranged V-shaped plate is fixedly connected to each of the two transverse plates, and the top and bottom of the two V-shaped plates are connected by a rubber component. The two V-shaped plates make the strip-shaped component rhomboid in shape, and the screening box is provided with a pushing part for pushing the V-shaped plates.

[0010] As a preferred embodiment of the present invention, the protective cover is fixedly connected to both sides with connecting rods, the inclined plate is fixedly connected to the connecting rods by a crossbar, the side wall of the screening box is provided with a sliding groove, the crossbar is slidably installed in the sliding groove, and a cover plate that covers the port of the sliding groove is fixedly connected to the crossbar.

[0011] As a preferred embodiment of the present invention, the pushing part includes a horizontal frame fixedly connected inside the screening box, and a top rod fixedly connected to the horizontal frame. The bottom of the top rod faces the lower port of the strip groove. When the inclined plate moves downward, the top rod will insert into the lower port of the strip groove and push the V-shaped plates on both sides. A spring is installed between the horizontal plate and the inner wall of the horizontal groove.

[0012] As a preferred embodiment of the present invention, vertical rods are fixedly connected to the top two sides of the inclined plate, and thin plates inserted into the lower port of the feed hopper are fixedly connected to the vertical rods.

[0013] As a preferred embodiment of the present invention, a guide plate is rotatably installed inside the screening box via a rotating rod. One end of the guide plate is inclined toward the first feed inlet, and the other end of the guide plate faces the fan. A rubber membrane is connected between the end of the guide plate facing the fan and the inner bottom of the screening box. A pull rope is connected between the inclined plate and the guide plate.

[0014] A seed screening method for alfalfa breeding includes the following steps: S1. Turn on the fan in the screening box to keep the airflow flowing, and then place the seeds in the feed hopper; S2. The seeds are discharged from the bottom of the feed hopper and pass over the surface of the inclined plate that moves up and down. S3. Allow the sieved seeds to enter the continuously rising and falling protective cover; S4. The seeds are then screened a second time using a sieve. S5. Seeds of different shapes are taken out through the second feed port and the guide trough respectively.

[0015] Compared with the prior art, the present invention provides a seed screening device for alfalfa breeding, which has the following beneficial effects: 1. In this seed screening device for alfalfa breeding, by dropping the seeds onto the inclined plate, the seeds will be subjected to the reaction force of the inclined plate, that is, the impact force when falling downwards. At the same time, the metal inclined plate can also eliminate the static electricity on the seeds and impurities, reducing the adsorption force between the seeds and impurities. As a result, some impurities on the seeds will fall off. The light impurities that fall off are easily discharged from the screening box with the airflow, improving the quality of subsequent seeds.

[0016] 2. In this seed screening equipment for alfalfa breeding, the horizontal shaft is driven to rotate by the chain drive assembly. The horizontal shaft drives the crankshaft to rotate, and the crankshaft drives the protective cover to move up and down through the push rod in the principle of crank and slider. The protective cover can then drive the internal screen to move up and down, thereby improving the screening efficiency of the screen.

[0017] 3. In this seed screening device for alfalfa breeding, the screen is made of elastic rubber. When a part of the screen is in a flat state, the diameter of the two ends of the filter hole is the same. When a part of the screen is in a bent state, that is, when it is in contact with the outer wall of the pulley, the two ends of the filter hole will be different sizes. Impurities and seeds stuck in the filter hole are easily discharged automatically, making the filter hole less prone to clogging, and thus allowing the screen to maintain better screening efficiency.

[0018] 4. In this seed screening device for alfalfa breeding, the inclined plate is driven to move up and down through the connecting rod and crossbar. The inclined plate will intermittently impact the seeds upward, making it easier for impurities on the seeds to loosen. It is also equivalent to simulating the manual throwing of seeds in a basin, making the seeds more loose and thus allowing the seeds to receive better air selection, further improving the seed screening effect. In addition, it is less likely for seeds to get stuck in the strip groove.

[0019] 5. In this seed screening device for alfalfa breeding, the inclined plate that moves up and down causes the two adjacent V-shaped plates to open and close intermittently, and the width of the strip groove also increases and decreases intermittently. As a result, seeds are less likely to get stuck in the strip groove. Furthermore, when seeds accumulate in the strip groove, the reciprocating V-shaped plates can repeatedly squeeze the seeds, which makes it easier for impurities on the seed surface to fall off, further improving the screening effect.

[0020] 6. In this seed screening equipment for alfalfa breeding, when the seeds are repeatedly squeezed by the metal V-shaped plate, the seeds and impurities that are stuck together will come into more full contact with the surface of the V-shaped plate. This allows the static electricity on the seeds and impurities to be removed more efficiently, making it easier to separate the seeds and impurities, and indirectly improving the screening effect.

[0021] The parts of this device not covered herein are the same as or can be implemented using existing technologies. By setting up strip plates, this invention can remove some impurities from the seeds. The removed light impurities can be easily discharged from the screening box with the airflow, improving the quality of subsequent seeds and making it easier to meet the requirements of high-purity breeding materials. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

[0023] Figure 1 This is a three-dimensional illustration of the present invention. Figure 1 ; Figure 2 This is a three-dimensional illustration of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of a partial structural front view of the present invention; Figure 4 This is a three-dimensional schematic diagram of a partial structure of the present invention. Figure 1 ; Figure 5 This is a three-dimensional schematic diagram of a partial structure of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the cross-section of the screen mesh of the present invention; Figure 7 This is a three-dimensional schematic diagram of a partial structure of the present invention. Figure 3 ; Figure 8 This is a schematic diagram of the inclined plate section of the present invention.

[0024] In the diagram: 1. Screening box; 2. Feed hopper; 3. Fan; 4. First feed inlet; 5. Inclined plate; 6. Protective cover; 7. Second feed inlet; 8. Guide chute; 9. Pulley; 10. Screen; 11. Conveyor motor; 12. Filter hole; 13. Strip component; 14. Strip chute; 15. Slot; 16. Crossbeam; 17. Horizontal chute; 18. Horizontal plate; 19. V-shaped plate; 20. Rubber component; 21. Spring; 22. Horizontal shaft; 23. Crankshaft; 24. Push rod; 25. Chain drive assembly; 26. Connecting rod; 27. Crossbar; 28. Slide groove; 29. ​​Cover plate; 30. Horizontal frame; 31. Top rod; 32. Rotating rod; 33. Guide plate; 34. Rubber membrane; 35. Pull rope; 36. Thin plate; 37. Vertical rod. Detailed Implementation

[0025] 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.

[0026] Example: Reference Figures 1-8 As shown, a seed screening device for alfalfa breeding includes a screening box 1 with a fan 3 installed inside. The screening box 1 is made of metal and grounded, such as stainless steel. The fan 3 generates airflow inside the screening box 1 and is mainly driven by a drive motor on the outer wall of the screening box 1. The top and bottom of the screening box 1 are respectively provided with a feed hopper 2 for feeding and a first discharge port 4 for discharging. It also includes an inclined plate 5, which is installed inside the screening box 1 and located below the feed hopper 2. The inclined plate 5 is made of metal, such as stainless steel which is easy to conduct static electricity, and has an inclination angle of 20°-60°. In this application, the preferred angle is 45°. It is electrically connected to the screening box 1. The inclined plate 5 has multiple equally spaced strip grooves 14, and slots 15 are opened on the inclined plate 5. Multiple equally spaced strip members 13 are connected in the slots 15. The strip members 13 are inclined synchronously with the inclined plate 5, and the inclination direction is towards the first feed port 4. The gap between two adjacent strip members 13 forms a strip groove 14. The width of the strip groove 14 is basically equal to the width of the standard seed. A protective cover 6 is set at the bottom of the screening box 1. The lower end of the first feed port 4 extends into the protective cover 6. A screen 10 for screening seeds is set inside the protective cover 6. A second feed port 7 is opened at the bottom of the protective cover 6. The screening box 1 is equipped with a shaking part that drives the protective cover 6 to move up and down.

[0027] In use, the seeds discharged from the feed hopper 2 into the screening box 1 will first fall onto the inclined plate 5. The seeds will be subjected to the reaction force of the inclined plate 5, that is, the impact force when falling downward. The metal inclined plate 5 can also remove static electricity from the seeds. The seeds and the seeds and impurities are not easily attracted to each other due to static electricity, so some impurities on the seeds will fall off. The light impurities that fall off are easily discharged from the screening box 1 with the airflow, improving the quality of the seeds. Due to the setting of the strip groove 14, the airflow in the screening box 1 can pass through the strip groove 14 and blow towards the seeds on the inclined plate 5. That is to say, when the seeds fall downward and hit the inclined plate 5, the airflow in the screening box 1 can maintain the air separation of the seeds. In addition, some seeds with no impurities on the surface and small size will pass through the strip groove 14, and another part will slide out from the tail of the inclined plate 5. Regardless of the sliding method, the seed surface will be subjected to a certain frictional resistance. This resistance will loosen the impurities on the surface, thus making it easier to screen out the light impurities. After the seeds fall into the first feed inlet 4, they will then fall onto the screen 10. The screen 10 will perform a secondary screening based on the size of the seeds. Smaller seeds will be discharged from the second feed inlet 7. During this process, the shaking part will cause the protective cover 6 and the screen 10 to shake up and down, which can significantly improve the screening efficiency of the screen 10.

[0028] In practical use, refer to Figure 3 As shown, in order to improve the impurity removal effect, the inclined plates 5 can be set to 2-4 groups. In this application, the preferred number is 3 groups, which are distributed in a stepped path in the screening box 1. This can significantly improve the seed screening effect.

[0029] Of course, in other implementations, refer to Figure 4 and Figure 7 As shown, the aforementioned shaking part includes a horizontal shaft 22 rotatably connected to the bottom of the screening box 1. A crankshaft 23 is fixedly mounted on the horizontal shaft 22. A push rod 24 is rotatably connected to the crankshaft 23. The other end of the push rod 24 is rotatably connected to the top of the protective cover 6. The protective cover 6 is longitudinally slidably mounted on the bottom of the screening box 1. The horizontal shaft 22 is connected to the mounting shaft of the fan 3 through a chain drive assembly 25. The chain drive assembly 25 is mainly composed of two sprockets and a chain.

[0030] During continuous operation of the fan 3, the horizontal shaft 22 will be driven to rotate through the chain drive assembly 25. The horizontal shaft 22 will drive the crankshaft 23 to rotate. The crankshaft 23 will drive the protective cover 6 to move up and down through the push rod 24 in the principle of crank and slider. The protective cover 6 can drive the internal screen 10 to move up and down, thereby improving the screening efficiency of the screen 10.

[0031] In another embodiment of the screen 10, refer to Figure 3 and Figure 6As shown, two pulleys 9 are rotatably installed inside the protective cover 6. The screen 10 is sleeved on the two pulleys 9 in the form of a belt. The screen 10 is made of elastic rubber, and the outer wall of the screen 10 is provided with filter holes 12 arranged at equal intervals. The outer wall of the protective cover 6 is equipped with a conveyor motor 11 that drives one of the pulleys 9 to rotate. A guide trough 8 extending to the outer wall is fixedly connected inside the protective cover 6. The guide trough 8 is arranged through the belt-shaped screen 10.

[0032] During use, the conveyor motor 11 drives the screen 10 to continuously convey seeds via the pulley 9. Small seeds on the screen 10 pass through the filter holes 12 into the guide trough 8 and are then discharged from the guide trough 8. Larger seeds move with the continuously conveying screen 10 and eventually fall from one end of the screen 10 into the protective cover 6, and are finally discharged from the second discharge port 7. Since the screen 10 is made of elastic rubber, when a part of the screen 10 is in a flat state, the diameters of the two ends of the filter holes 12 are the same. When a part of the screen 10 is in a bent state, that is, when it is in contact with the outer wall of the pulley 9, the two ends of the filter holes 12 will be different sizes. As a result, impurities and seeds stuck in the filter holes 12 are easily discharged automatically, making the filter holes 12 less prone to clogging, and thus allowing the screen 10 to maintain better screening efficiency.

[0033] Reference Figure 4 , Figure 5 as well as Figure 7 As shown, both sides of the protective cover 6 are fixedly connected with connecting rods 26, the inclined plate 5 is fixedly connected to the connecting rods 26 via crossbars 27, the side wall of the screening box 1 is provided with a sliding groove 28, the crossbar 27 is slidably installed in the sliding groove 28, and a cover plate 29 is fixedly connected to the crossbar 27 to cover the port of the sliding groove 28.

[0034] When the protective cover 6 moves up and down, it will also drive the inclined plate 5 to move up and down through the connecting rod 26 and the crossbar 27. The inclined plate 5 will intermittently impact the seeds upward, making it easier for impurities on the seeds to loosen. It is also equivalent to simulating the manual use of a basin to throw the seeds, making the seeds more loose and thus allowing the seeds to receive better wind selection, further improving the seed selection effect. In addition, it is less likely for the seeds to get stuck in the strip groove 14.

[0035] Reference Figure 5 and Figure 8As shown, the strip 13 includes a crossbeam 16 fixedly connected within the slot 15. Horizontal slots 17 are provided on both sides of the crossbeam 16, and horizontal plates 18 are slidably installed within each of the two slots 17. A transversely arranged V-shaped plate 19 is fixedly connected to each of the two horizontal plates 18. The V-shaped plate 19, the horizontal plates 18, and the crossbeam 16 are all made of metal, such as stainless steel. The two V-shaped plates 19 are symmetrically arranged on both sides of the crossbeam 16. The top and bottom of the two V-shaped plates 19 are connected by a rubber component 20. The rubber component 20 is elastic and used to seal the upper and lower edges of the two V-shaped plates 19. The V-shaped plate 19 makes the strip 13 rhomboid in shape, causing the upper and lower ends of the strip groove 14 to form a V-shaped structure with an included angle of 15°-75°. The preferred angle in this application is 30°. The screening box 1 is provided with a pushing part for pushing the V-shaped plate 19. The pushing part includes a crossbeam 30 fixedly connected in the screening box 1. A top rod 31 is fixedly connected on the crossbeam 30. The bottom of the top rod 31 faces the lower port of the strip groove 14. When the inclined plate 5 moves downward, the top rod 31 will insert into the lower port of the strip groove 14 and push the V-shaped plates 19 on both sides. A spring 21 is installed between the crossbeam 18 and the inner wall of the cross groove 17.

[0036] When the inclined plate 5 moves downward, it causes all the V-shaped plates 19 to move downward synchronously. When it reaches its limit position, the push rod 31 inserts into the slot 14. The V-shaped plates 19 on both sides of the slot 14 are subjected to the lateral pressure of the push rod 31, and thus slide towards the crossbeam 16, causing the cross plate 18 to compress the spring 21 and the rubber part 20. At this time, the width of the slot 14 increases. When the inclined plate 5 moves upward and resets, the V-shaped plates 19 are no longer subjected to the pressure of the push rod 31, and the spring 21 pushes the V-shaped plates 19 to move laterally in the opposite direction and reset. Thus, the rising and falling inclined plate 5 causes the adjacent two V-shaped plates 19 to open and close intermittently. The opening and closing range is 2 to 4 times the standard seed width. In this application, the preferred width is 2 times. The width of the slot 14 also intermittently increases. The expansion and contraction of the V-shaped plate 19 prevents seeds from getting stuck in the groove 14. When seeds accumulate in the groove 14, the reciprocating V-shaped plate 19 repeatedly squeezes the seeds. Since the groove 14 is V-shaped at both ends, the seeds are not subjected to horizontal or vertical squeezing force. The squeezed seeds slide towards the top of the groove 14 (the overall action is similar to a kneading effect), which makes it easier for impurities on the seed surface to loosen and fall off, further improving the screening effect. In addition, when the metal V-shaped plate 19 reciprocates and squeezes the seeds, it makes the seeds and impurities that are stuck together more fully contact the surface of the V-shaped plate 19, which allows the static electricity on the seeds and impurities to be removed more efficiently, making it easier to separate the seeds and impurities, indirectly improving the screening effect.

[0037] Reference Figure 3 and Figure 5As shown, vertical rods 37 are fixedly connected to the top two sides of the inclined plate 5. A thin plate 36 inserted into the lower port of the feed hopper 2 is fixedly connected to the vertical rods 37. When the inclined plate 5 moves up and down, the thin plate 36 will move up and down in the lower port of the feed hopper 2 through the vertical rods 37. This will prevent the feed hopper 2 from being blocked by seeds and will also allow the seeds to be discharged into the screening box 1 more evenly.

[0038] Reference Figure 3 and Figure 5 As shown, a guide plate 33 is rotatably installed inside the screening box 1 via a rotating rod 32. One end of the guide plate 33 is inclined toward the first feed port 4, and the other end of the guide plate 33 faces the fan 3. A rubber membrane 34 is connected between the end of the guide plate 33 facing the fan 3 and the inner bottom of the screening box 1. A pull rope 35 is connected between the inclined plate 5 and the guide plate 33.

[0039] As the seeds fall downwards, they will enter the first feed inlet 4 along the inclined guide plate 33. The up-and-down inclined plate 5 will intermittently pull the guide plate 33 through the pull rope 35, causing the guide plate 33 to swing back and forth around the rotating rod 32. This will allow the seeds on the guide plate 33 to enter the first feed inlet 4 more efficiently. During this period, the rubber membrane 34 can easily reset the guide plate 33 and prevent the seeds from easily entering the triangular cavity formed between the guide plate 33 and the bottom of the screening box 1.

[0040] Reference Figures 1-8 A seed screening method for alfalfa breeding includes the following steps: S1. Turn on the fan 3 inside the screening box 1 to make the airflow continuous, and then place the seeds into the feed hopper 2; S2. The seeds are discharged from the bottom of the feed hopper 2 and pass over the surface of the inclined plate 5 that moves up and down. S3. Allow the sieved seeds to enter the continuously rising and falling protective cover 6; S4. The seeds are sieved twice through sieve 10. S5. Seeds of different shapes are taken out through the second feed port 7 and the feed trough 8 respectively.

[0041] In this invention, when in use, the seeds discharged from the feed hopper 2 into the screening box 1 will first fall onto the inclined plate 5. The seeds will be subjected to the reaction force of the inclined plate 5, that is, the impact force when falling downwards, which will cause some impurities on the seeds to fall off. The light impurities that fall off are easily discharged from the screening box 1 with the airflow, improving the quality of subsequent seeds. Due to the setting of the strip groove 14, the airflow in the screening box 1 can pass through the strip groove 14 and blow towards the seeds on the inclined plate 5. That is to say, when the seeds fall downwards and hit the inclined plate 5, the airflow in the screening box 1 can maintain the air separation of the seeds. In addition, some seeds with no impurities on the surface and small size will pass through the strip groove 14, and another part will slide out from the tail of the inclined plate 5. Regardless of the sliding method, the seed surface will be subjected to a certain frictional resistance. This resistance will loosen the impurities on the surface, thus making it easier to screen out the light impurities. After the seeds fall into the first feed inlet 4, they will then fall onto the screen 10. The conveyor motor 11 will continuously convey the seeds through the pulley 9. Smaller seeds on the screen 10 will pass through the filter holes 12 into the guide trough 8, completing the secondary screening of the seeds. The screened smaller seeds will be discharged from the guide trough 8, while larger seeds will move with the continuously conveying screen 10 and eventually fall from one end of the screen 10 into the protective cover 6, and finally be discharged from the second feed inlet 7. Because the screen 10 is made of elastic rubber, when a part of the screen 10 is in a flat state, the diameters of the two ends of the filter holes 12 are the same. When a part of the screen 10 is in a bent state, that is, when it is in a bent state with the pulley 9... When the outer walls are in contact, the two ends of the filter holes 12 will be different sizes, so the impurities and seeds stuck in the filter holes 12 can be automatically discharged automatically, making the filter holes 12 less prone to clogging. This will allow the screen 10 to maintain better screening efficiency. During the continuous operation of the fan 3, the horizontal shaft 22 will be driven to rotate through the chain drive assembly 25. The horizontal shaft 22 will drive the crankshaft 23 to rotate. The crankshaft 23 will drive the protective cover 6 to move up and down through the push rod 24 in the principle of crank and slider. The protective cover 6 can then drive the internal screen 10 to move up and down, which will cause the protective cover 6 and the screen 10 to shake up and down. This can significantly improve the screening efficiency of the screen 10 for seeds, and the grading can be obtained in three grades: full large seeds, medium and shriveled impurities.

[0042] Components not described in detail in this article are existing technologies.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A seed screening device for alfalfa breeding, comprising a screening box (1) with a fan (3) installed inside, wherein the top and bottom of the screening box (1) are respectively provided with a feed hopper (2) and a first feed inlet (4), characterized in that, Also includes: An inclined plate (5) is set inside the screening box (1) and located below the feed hopper (2). The inclined plate (5) is provided with a plurality of equally spaced strip grooves (14). A protective cover (6) is provided at the bottom of the screening box (1). The lower port of the first material port (4) extends into the protective cover (6). A screen (10) is provided inside the protective cover (6). A second material port (7) is provided at the bottom of the protective cover (6). A shaking part is provided on the screening box (1) to drive the protective cover (6) to move up and down.

2. The seed screening device for alfalfa breeding according to claim 1, characterized in that, The inclined plate (5) has a slot (15) and a plurality of equally spaced strips (13) are connected in the slot (15). The gap between two adjacent strips (13) forms the strip groove (14).

3. The seed screening device for alfalfa breeding according to claim 1, characterized in that, Two pulleys (9) are rotatably installed inside the protective cover (6). The screen (10) is sleeved on the two pulleys (9) in the form of a belt. The screen (10) is made of rubber and has filter holes (12) arranged at equal intervals on its outer wall. A conveyor motor (11) that drives one of the pulleys (9) to rotate is installed on the outer wall of the protective cover (6). A guide trough (8) extending to the outer wall is fixedly connected inside the protective cover (6). The guide trough (8) is arranged through the screen (10) in the form of a belt.

4. The seed screening device for alfalfa breeding according to claim 1, characterized in that, The shaking part includes a horizontal shaft (22) rotatably connected to the bottom of the screening box (1), a crankshaft (23) is fixedly installed on the horizontal shaft (22), a push rod (24) is rotatably connected on the crankshaft (23), the other end of the push rod (24) is rotatably connected to the top of the protective cover (6), the protective cover (6) is longitudinally slidably installed at the bottom of the screening box (1), and the horizontal shaft (22) is connected to the mounting shaft of the fan (3) through a chain drive assembly (25).

5. A seed screening device for alfalfa breeding according to claim 2, characterized in that, The strip (13) includes a crossbeam (16) fixedly connected in the slot (15). Both sides of the crossbeam (16) are provided with cross grooves (17). A cross plate (18) is slidably installed in each of the two cross grooves (17). A horizontally arranged V-shaped plate (19) is fixedly connected to each of the two cross plates (18). The top and bottom of the two V-shaped plates (19) are connected by a rubber part (20). The two V-shaped plates (19) make the strip (13) rhomboid in shape. The screening box (1) is provided with a pushing part to push the V-shaped plate (19).

6. The seed screening device for alfalfa breeding according to claim 3, characterized in that, Both sides of the protective cover (6) are fixedly connected to connecting rods (26). The inclined plate (5) is fixedly connected to the connecting rods (26) by a crossbar (27). The side wall of the screening box (1) is provided with a sliding groove (28). The crossbar (27) is slidably installed in the sliding groove (28). A cover plate (29) is fixedly connected to the crossbar (27) to cover the port of the sliding groove (28).

7. A seed screening device for alfalfa breeding according to claim 5, characterized in that, The pushing part includes a crossbar (30) fixedly connected inside the screening box (1). A top rod (31) is fixedly connected to the crossbar (30). The bottom of the top rod (31) faces the lower port of the strip groove (14). When the inclined plate (5) moves downward, the top rod (31) will insert into the lower port of the strip groove (14) and push the V-shaped plates (19) on both sides. A spring (21) is installed between the crossbar (18) and the inner wall of the cross groove (17).

8. The seed screening device for alfalfa breeding according to claim 1, characterized in that, Vertical rods (37) are fixedly connected to the top two sides of the inclined plate (5), and thin plates (36) inserted into the lower port of the feed hopper (2) are fixedly connected to the vertical rods (37).

9. A seed screening device for alfalfa breeding according to claim 1, characterized in that, Inside the screening box (1), a guide plate (33) is rotatably installed via a rotating rod (32). One end of the guide plate (33) is inclined toward the first feed inlet (4), and the other end of the guide plate (33) faces the fan (3). A rubber membrane (34) is connected between the end of the guide plate (33) facing the fan (3) and the bottom of the screening box (1). A pull rope (35) is connected between the inclined plate (5) and the guide plate (33).

10. A seed screening method for alfalfa breeding, comprising the seed screening device for alfalfa breeding as described in any one of claims 1-9, characterized in that, It also includes the following steps: S1. Turn on the fan (3) inside the screening box (1) to make the airflow continuous, and then place the seeds into the feed hopper (2); S2, so that the seeds are discharged from the bottom of the feed hopper (2) and pass over the surface of the inclined plate (5) that moves up and down; S3. The sieved seeds are placed into the continuously rising and falling protective cover (6); S4. The seeds are sieved twice through a sieve (10); S5. Seeds of different shapes are taken out through the second feed port (7) and the feed trough (8).

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