Agricultural breeding corn seed screening device and screening method

Abstract

The present application relates to a kind of corn screening technical field, specifically to a kind of corn seed screening device and screening method for agricultural breeding, comprising: support, sieve plate, drive mechanism, adjusting mechanism, oscillation mechanism and movable plate, each component is mutually matched, can be automatically adjusted the discharging rate of inlet hopper according to the amount of corn conveying to inlet hopper, and the vibration frequency of sieve plate is adjusted, when the conveying amount of corn is larger, under the action of gravity of corn, drive opening and closing mechanism movement, so that the gap between movable plate and inlet hopper increases, to increase the rate of corn conveying to sieve plate, under the action of drive mechanism, sieve plate is driven reciprocating vibration by reciprocating mechanism, when opening and closing mechanism movement, adjusting mechanism is also driven to move, so that drive mechanism moves, to increase the vibration frequency of sieve plate by reciprocating mechanism, so that screening efficiency increases.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of corn screening, in particular to a corn seed screening device and method for agricultural breeding. BACKGROUND

[0002] In recent years, with the continuous updating of technology, the development of agriculture has gradually risen to a new height, and the yield of food has improved qualitatively, and the quality of seeds is one of the important factors affecting the yield of food.

[0003] As for planting corn, how to choose a good corn variety, the first thing to do is to choose seeds, and seed selection is to improve the germination rate, and size classification is to improve the uniformity of emergence, so as to achieve full seedling, uniform seedling and improve yield. Size classification makes the seed sowing density uniform, and the seed size classification is also for the more accurate seeding of the seeding machine.

[0004] The existing seed screening is generally processed by a grading screen. When a large amount of seeds is added to the feed hopper at one time, the seeds entering the screen plate will be too much. However, when the seeds are too much, the screening force provided by the grading screen does not change, so that many corn seeds are processed without being screened, and the screening effect of the seeds is not good. SUMMARY

[0005] The present application relates to the technical field of corn screening, in particular to a corn seed screening device and method for agricultural breeding.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A corn seed screening device for agricultural breeding, comprising:

[0008] A support is fixedly installed with a feed hopper, and a discharge hole is formed in the bottom of the feed hopper;

[0009] A movable plate is symmetrically arranged in the feed hopper, and an opening and closing mechanism connected with the movable plate is arranged in the feed hopper, which can drive the movable plate to move towards each other under the action of gravity;

[0010] A screen plate is arranged on the support, and the screen plate is used to receive the corn transported by the feed hopper, and a vibration mechanism connected with the screen plate is arranged on the support, which can drive the screen plate to reciprocate in the horizontal direction;

[0011] A driving mechanism is arranged on the support and connected with the oscillating mechanism, and an adjusting mechanism connected with the driving mechanism and the opening and closing mechanism is arranged on the feeding hopper, the driving mechanism can drive the sieve plate to move through the oscillating mechanism, and the oscillating frequency of the sieve plate can be adjusted through the driving mechanism under the action of the adjusting mechanism.

[0012] As a further scheme of the present application, the opening and closing mechanism comprises a hollow rod fixedly arranged in the feeding hopper, a supporting rod movably arranged in the hollow rod, a first spring sleeved on the supporting rod and abutting against the hollow rod, a driven assembly connected with the supporting rod arranged in the feeding hopper, and the driven assembly is connected with the movable plate and the adjusting mechanism.

[0013] As a further scheme of the present application, the driven assembly comprises a hollow plate fixedly arranged on the supporting rod and abutting against the first spring, a through slot symmetrically arranged on the side wall of the hollow plate, a hinge rod hingedly arranged in the feeding hopper and penetrating through the through slot and hingedly connected with the movable plate, and the hollow plate is movably connected with the movable plate.

[0014] As a further scheme of the present application, the oscillating mechanism comprises a rotating rod rotatably arranged on the support, a belt pulley fixedly arranged on the rotating rod and connected with the driving mechanism, and a rotating disc fixedly arranged on the rotating rod, a limiting block fixedly arranged on the side of the rotating disc away from the rotating rod, a guide assembly connected with the limiting block arranged on the support, and the guide assembly is connected with the sieve plate.

[0015] As a further scheme of the present application, the guide assembly comprises guide rods fixedly arranged on the support and symmetrically arranged, a guide sleeve movably arranged on the guide rods and fixedly connected with the sieve plate, and a connecting plate fixedly arranged on the guide sleeve, a groove arranged on the side of the connecting plate facing the rotating disc and engaged with the limiting block.

[0016] As a further scheme of the present application, the driving mechanism comprises a motor fixedly arranged on the support, an output shaft of the motor penetrating through the support and connected with a transmission rod, a supporting disc fixedly arranged on the transmission rod, a supporting assembly connected with the supporting disc and the belt pulley arranged on the support, and the transmission rod is connected with the adjusting mechanism.

[0017] As a further scheme of the present application, the supporting assembly comprises a plurality of sliding grooves circumferentially and equidistantly arranged on the supporting disc, a sliding rod slidably arranged in the sliding grooves, an arc-shaped plate fixedly arranged on the sliding rod, and a belt sleeved on the arc-shaped plate and connected with the belt pulley.

[0018] As a further scheme of the present application: the adjusting mechanism comprises a movable sleeve movably mounted on the transmission rod, a connecting rod articulated with the sliding rod is articulated on the movable sleeve, a second spring is sleeved on the transmission rod and abuts against one end of the movable sleeve and the other end of the supporting disc, and the feeding hopper is provided with a limiting assembly connected with the movable sleeve.

[0019] As a further scheme of the present application: the limiting assembly comprises a spiral groove formed in one end of the supporting rod away from the hollow plate, a rotating sleeve is fixedly mounted at the bottom of the feeding hopper, a protrusion in clamping connection with the spiral groove is fixed on the inner wall of the rotating sleeve, and a cam abutting against the movable sleeve is fixed on one end of the rotating sleeve away from the feeding hopper.

[0020] A corn seed screening method for agricultural breeding comprises the following steps:

[0021] Step one: corn is poured into the feeding hopper, under the action of gravity of the corn, the opening and closing mechanism is driven to move, thereby driving the movable plate to move towards the direction of mutual approach, so that the corn can be conveyed to the screen plate through the gap formed between the movable plate and the feeding hopper;

[0022] Step two: the driving mechanism is driven to move, and the screen plate is driven to reciprocate in the horizontal direction through the reciprocating mechanism, so as to screen the corn;

[0023] Step three: as the amount of corn placed in the feeding hopper gradually increases, the opening and closing mechanism will drive the adjusting mechanism to move, under the action of the adjusting mechanism, the reciprocating mechanism is driven to move by the driving mechanism, so that the frequency of reciprocating vibration of the screen plate increases, thereby increasing the screening efficiency.

[0024] Compared with the prior art, the present application has the beneficial effects that: the present application can automatically adjust the discharging rate of the feeding hopper and the vibration frequency of the screen plate according to the amount of corn conveyed into the feeding hopper, when the conveying amount of corn is large, under the action of gravity of the corn, the opening and closing mechanism is driven to move, so that the gap between the movable plate and the feeding hopper increases, thereby increasing the rate of corn conveyed onto the screen plate, under the action of the driving mechanism, the screen plate is driven to reciprocate by the reciprocating mechanism, when the opening and closing mechanism moves, the adjusting mechanism is also driven to move, so that the driving mechanism moves, thereby increasing the vibration frequency of the screen plate through the reciprocating mechanism, so that the screening efficiency is increased. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structural schematic view of an embodiment of the corn seed screening device for agricultural breeding.

[0026] Figure 2 It is a structural schematic view of an embodiment of the corn seed screening device for agricultural breeding. Figure 1 It is an enlarged structural schematic view of the structure at A.

[0027] Figure 3 Structure diagram of another angle of one embodiment of the corn seed screening device for agricultural breeding.

[0028] Figure 4 Structure diagram of a partial half cut of one embodiment of the corn seed screening device for agricultural breeding.

[0029] Figure 5 Structure diagram of the connection relationship of the opening and closing mechanism and the partial adjusting mechanism of one embodiment of the corn seed screening device for agricultural breeding.

[0030] Figure 6 Structure diagram of the explosion of the partial opening and closing mechanism of one embodiment of the corn seed screening device for agricultural breeding.

[0031] Figure 7 Structure diagram of the connection relationship of the partial driving mechanism and the reciprocating mechanism of one embodiment of the corn seed screening device for agricultural breeding.

[0032] Figure 8 Structure diagram of the explosion of the partial driving mechanism and the partial adjusting mechanism of one embodiment of the corn seed screening device for agricultural breeding.

[0033] Figure 9 Structure diagram of the explosion of the reciprocating mechanism of one embodiment of the corn seed screening device for agricultural breeding.

[0034] Figure 10 Structure diagram of another embodiment of the corn seed screening device for agricultural breeding.

[0035] In the figure: 1, support; 2, feeding hopper; 3, hollow rod; 4, support rod; 5, No. 1 spring; 6, hollow plate; 7, through slot; 8, movable plate; 9, hinged rod; 10, spiral groove; 11, rotating sleeve; 12, protrusion; 13, cam; 14, guide rod; 15, guide sleeve; 16, sieve plate; 17, motor; 18, transmission rod; 19, support disc; 20, sliding slot; 21, sliding rod; 22, arc plate; 23, movable sleeve; 24, No. 2 spring; 25, connecting rod; 26, belt; 27, rotating rod; 28, pulley; 29, rotating disc; 30, connecting plate; 31, receiving frame; 32, material collecting box; 33, partition plate. Embodiment

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] In addition, elements in the present application can be referred to or described as "fixed" or "set" on another element, which can be directly on another element or can exist with intervening elements. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for illustrative purposes only and are not intended to be limiting.

[0038] Referring to Figures 1-9 In an embodiment of the present application, a corn seed screening device for agricultural breeding includes:

[0039] A support 1 is provided, and a feeding hopper 2 is fixedly installed on the support 1. A discharging hole is formed in the bottom of the feeding hopper 2.

[0040] Referring to Figure 1 , Figure 3 , Figure 7 , Figure 9 A sieve plate 16 is arranged on the support 1, and the sieve plate 16 is used to receive corn delivered by the feeding hopper 2. An oscillation mechanism connected with the sieve plate 16 is further arranged on the support 1. The oscillation mechanism can drive the sieve plate 16 to reciprocate in the horizontal direction. The oscillation mechanism includes a rotating rod 27 rotatably installed on the support 1. A belt pulley 28 connected with the driving mechanism is fixedly installed on the rotating rod 27. A rotating disc 29 is further fixedly installed on the rotating rod 27. A limiting block is fixed to the side of the rotating disc 29 away from the rotating rod 27. A guide assembly connected with the limiting block is arranged on the support 1. The guide assembly is connected with the sieve plate 16. The guide assembly includes guide rods 14 fixedly installed on the support 1 and symmetrically arranged. A guide sleeve 15 fixedly connected with the sieve plate 16 is movably installed on the guide rods 14. A connecting plate 30 is fixedly installed on the guide sleeve 15. A groove engaged with the limiting block is formed in the side of the connecting plate 30 facing the rotating disc 29.

[0041] In detail, a plurality of sieve holes are formed in the sieve plate 16, and the sieve plate 16 is arranged in an inclined manner. When corn is delivered to the sieve plate 16, the driving belt pulley 28 is driven to rotate by the driving mechanism, thereby driving the rotating rod 27 to rotate. The rotating rod 27 further drives the rotating disc 29 to rotate, so that the limiting block rotates around the rotating rod 27. The limiting block is engaged with the groove, so that the connecting plate 30 moves. The connecting plate 30 further drives the guide sleeve 15 to move along the length direction of the guide rod 14. The guide rod 14 and the guide sleeve 15 have a guiding effect, so as to ensure that the sieve plate 16 only moves along the length direction of the guide rod 14 and cannot deviate. Under the action of gravity and the oscillation force, the corn is screened and gradually moves outward from the sieve plate 16.

[0042] Wherein, please refer to Figure 10 , as another embodiment of the present application, the screen holes opened on the screen plate 16 are arranged in multiple groups at equal intervals, and the aperture of each group of screen holes gradually increases from near to far. When the corn moves along the length direction of the screen plate 16 under the action of gravity, corns of different sizes will be screened to the below of the screen plate through the corresponding aperture, thereby realizing the effect of screening different grades of seed kernels. In order to realize the classification and collection of different grades of seed kernels, at least two receiving frames 31 are installed at the bottom of the support 1, and the receiving boxes 32 are placed on the receiving frames 31. The inner side of the receiving box 32 is divided into multiple collection grooves by multiple partition plates 33. Different grades of seed kernels enter different collection grooves.

[0043] Please refer to Figures 1-3 、 Figure 7 、 Figure 8 , a driving mechanism is arranged on the support 1 and connected with the oscillation mechanism. The driving mechanism comprises a motor 17 fixedly installed on the support 1. The output shaft of the motor 17 penetrates the support 1 and is connected with a transmission rod 18. A supporting disc 19 is fixedly installed on the transmission rod 18. A supporting assembly connected with the supporting disc 19 and the belt pulley 28 is arranged on the support 1. The transmission rod 18 is connected with the adjusting mechanism. The supporting assembly comprises multiple sliding grooves 20 arranged at equal intervals in a circle on the supporting disc 19. A sliding rod 21 is slidingly installed in the sliding groove 20. An arc-shaped plate 22 is fixed on the sliding rod 21. The arc-shaped plate 22 is sleeved with the belt 26 connected with the belt pulley 28.

[0044] It should be noted that the belt 26 is made of elastic material and can be stretched or contracted within a certain range. In the initial state, the distance between the sliding rod 21 and the arc-shaped plate 22 is the smallest, so that the belt 26 is in the normal state. When the motor 17 works, it drives the transmission rod 18 to rotate, thereby driving the supporting disc 19 to move. The supporting disc 19 drives the sliding rod 21 to rotate around the supporting disc 19 through the sliding groove 20, thereby driving the belt pulley 28 to rotate through the belt 26, so that the rotating rod 27 rotates to drive the screen plate 16 to continuously reciprocate. Since the rotating radius of the supporting disc 19 is greater than the rotating radius of the rotating rod 27, the rotating speed of the rotating rod 27 is greater than the rotating speed of the supporting disc 19, which ensures that the oscillation frequency of the screen plate 16 is higher, so that the screening effect is better.

[0045] Preferably, the device is used for screening corn seeds after drying, since impurities can be mixed in the drying process, therefore, a fan (not shown in the figure) can be installed on the support 1, when screening corn, the fan is opened during the corn is transported to the sieve plate 16 through the feeding hopper 2, under the action of the wind, the impurities mixed in the corn such as grass leaves are blown out, so as to achieve the effect of removing impurities for the required screening corn seeds.

[0046] Please refer to Figures 1-8 , the feeding hopper 2 is provided with an adjusting mechanism connected with the driving mechanism, the driving mechanism can drive the sieve plate 16 to move through the oscillation mechanism, and the oscillation frequency of the sieve plate 16 is adjusted through the driving mechanism under the action of the adjusting mechanism, the adjusting mechanism comprises a movable sleeve 23 movably installed on the transmission rod 18, the movable sleeve 23 is hinged with a connecting rod 25 hinged with the sliding rod 21, the transmission rod 18 is provided with a second spring 24 abutting at one end with the movable sleeve 23 and at the other end with the support disc 19, the feeding hopper 2 is provided with a limiting component connected with the movable sleeve 23 and the opening and closing mechanism, wherein the limiting component comprises a spiral groove 10 opened on the opening and closing mechanism, the feeding hopper 2 is fixedly installed with a rotating sleeve 11 at the bottom, the inner wall of the rotating sleeve 11 is fixedly provided with a protrusion 12 clamped with the spiral groove 10, and the end of the rotating sleeve 11 away from the feeding hopper 2 is fixedly provided with a cam 13 abutting with the movable sleeve 23.

[0047] Further, the spiral groove 10 is arranged in a spiral shape, and the number of spiral turns is half a turn. In the initial state, the second spring 24 is in a compressed state, so that the movable sleeve 23 is located at the end of the stroke away from the support disc 19. The short shaft of the cam 13 abuts against the movable sleeve 23, and the protrusion 12 is located at the end of the stroke on the side of the spiral groove 10 facing the sieve plate 16. When corn is poured into the feed hopper 2, the corn will act on the opening and closing mechanism and the movable plate 8, and enter the feed hopper 2 through the gap between the movable plate 8 and the feed hopper 2, and then be conveyed to the sieve plate 16 through the discharge hole. If the amount of corn poured is large, this will cause the corn to accumulate on the opening and closing mechanism. Under the action of the gravity of the corn, the opening and closing mechanism will move and drive the movable plate 8 to move towards each other, so that the gap between the movable plate 8 and the feed hopper 2 increases, thereby increasing the conveying rate of the corn. At the same time, the opening and closing mechanism also drives the spiral groove 10 to move, so that the protrusion 12 engaged with the spiral groove 10 moves, thereby driving the rotating sleeve 11 to rotate, so that the cam 13 rotates and drives the movable sleeve 23 to move towards the support disc 19, and compresses the second spring 24. The movable sleeve 23 also drives the connecting rod 25 to move, so that the sliding rod 21 moves along the length direction of the sliding groove 20, thereby increasing the distance between the arc-shaped plates 22. Under the action of the arc-shaped plates 22, the belt 26 is stretched. Since the radius of rotation of the arc-shaped plates 22 increases, the rotation rate of the pulley 28 is controlled to increase through the belt 26, so that the oscillation frequency of the sieve plate 16 increases, thereby increasing the screening efficiency of the corn when the conveying rate of the corn increases, so that the corn does not accumulate on the sieve plate 16. As the conveying rate of the corn decreases, the opening and closing mechanism will move towards the initial position, and under the action of the spiral groove 10 and the protrusion 12, the cam 13 is reset, the second spring 24 is elastically released, and the movable sleeve 23 is driven to reset, so that the sliding rod 21 moves towards the initial position, so that the distance between the arc-shaped plates 22 decreases, and the belt 26 automatically contracts, thereby reducing the vibration frequency of the sieve plate 16.

[0048] Please refer to Figure 1 , Figures 3-6The utility model relates to a kind of corn feeding device, including hopper 2, activity board 8, it is symmetrically arranged in the hopper 2, the opening and closing mechanism is arranged in the hopper 2 and is connected with the activity board 8 and the adjusting mechanism, the opening and closing mechanism can drive the activity board 8 to move towards each other when being subjected to the action of gravity, the opening and closing mechanism can also drive the drive mechanism to move by the adjusting mechanism, the opening and closing mechanism includes hollow rod 3 fixedly installed in the hopper 2, support rod 4 is movably installed in the hollow rod 3, the support rod 4 is sleeved with the abutment of hollow rod 3 No.

[0049] Further, in initial state, one spring 5 is in slightly compressed state, so that support rod 4 is located at the end of stroke away from the direction of sieve plate 16, so that hollow plate 6 is located at the highest point of hopper 2, under the action of hinged rod 9, activity board 8 is located at the end of stroke away from the direction of hollow plate 6, at this time, a certain gap is left between activity board 8 and hopper 2, when corn is poured into hopper 2, corn will enter hopper 2 through the gap and be transported into sieve plate 16 through discharge hole, however, if the pouring amount of corn is greater than the transport amount, corn will be accumulated on activity board 8 and hollow plate 6, so that activity board 8 and hollow plate 6 are subjected to certain pressure, under the action of pressure, hollow plate 6 and activity board 8 are driven to move towards the direction of sieve plate 16, so that support rod 4 moves towards the direction of sieve plate 16, so that one spring 5 is compressed, under the action of hinged rod 9, activity board 8 is driven to move into hollow plate 6, so that the gap between activity board 8 and hopper 2 increases, thereby accelerating the transport rate of corn, support rod 4 also drives helical groove 10 to move, under the action of protrusion 12, drive rotating sleeve 11 and cam 13 to rotate, thereby controlling arc-shaped plate 22 to move away from each other, so that the vibration frequency of sieve plate 16 increases, as the pouring amount of corn decreases, the pressure on activity board 8 and hollow plate 6 decreases, one spring 5 is elastically released, so that activity board 8 and hollow plate 6 gradually reset.

[0050] Preferably, the device is used, with the change of the amount of material, the frequency of the oscillation of the screen plate 16 will be self-adapted to adjust, so as to realize the screening efficiency always keeps in a certain range, therefore, the user does not need to adjust manually according to the amount of material, in the process of self-adapted adjustment, the load of the motor 17 changes with the change of the amount of material, so as to realize the effect of reducing the load of the motor 17 when the amount of material is small.

[0051] A method for screening corn seeds for agricultural breeding, comprising the following steps:

[0052] Step one: pour the corn into the hopper 2, under the action of the gravity of the corn, drive the opening and closing mechanism to move, so as to drive the movable plate 8 to move towards the direction of approaching each other, so that the corn can be transported to the screen plate 16 through the gap formed between the movable plate 8 and the hopper 2;

[0053] Step two: drive the mechanism to move, and drive the screen plate 16 to reciprocate in the horizontal direction through the reciprocating mechanism, so as to screen the corn;

[0054] Step three: as the amount of corn placed in the hopper 2 gradually increases, the opening and closing mechanism will drive the adjusting mechanism to move, under the action of the adjusting mechanism, drive the reciprocating mechanism to move through the driving mechanism, so that the frequency of the reciprocating vibration of the screen plate 16 increases, thereby increasing the screening efficiency.

[0055] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0056] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A corn seed screening device for agricultural breeding, characterized by, The utility model relates to a corn screening device, including: Support (1), the support (1) is fixedly installed with the feeding hopper (2), the feeding hopper (2) bottom is provided with the discharging hole; Screen plate (16) is arranged on the support (1), the screen plate (16) is used for receiving the corn that the feeding hopper (2) transports, the support (1) is also provided with the oscillation mechanism connected with the screen plate (16), the oscillation mechanism can drive the screen plate (16) reciprocating motion in horizontal direction; Driving mechanism is arranged on the support (1) and is connected with the oscillation mechanism, the feeding hopper (2) is provided with the adjusting mechanism connected with the driving mechanism, the driving mechanism can drive the screen plate (16) motion through the oscillation mechanism, and under the action of the adjusting mechanism, the oscillation frequency of the screen plate (16) is adjusted through the driving mechanism; Movable plate (8) is arranged in the feeding hopper (2) and is symmetrically arranged, the feeding hopper (2) is provided with the opening and closing mechanism connected with the movable plate (8) and the adjusting mechanism, the opening and closing mechanism can drive the movable plate (8) to move towards each other when being subjected to the action of gravity, the opening and closing mechanism can also drive the driving mechanism motion through the adjusting mechanism; The oscillation mechanism includes the rotary rod (27) rotatably installed on the support (1), the rotary rod (27) is fixedly installed with the pulley (28) connected with the driving mechanism, the rotary rod (27) is also fixed with the rotary disc (29), the rotary disc (29) is fixed with the limit block on the side away from the rotary rod (27), the support (1) is provided with the guide assembly connected with the limit block, and the guide assembly is connected with the screen plate (16); The guide assembly includes the guide rod (14) fixedly installed on the support (1) and symmetrically arranged, the guide rod (14) is movably installed with the guide sleeve (15) fixedly connected with the screen plate (16), the guide sleeve (15) is fixed with the connecting plate (30), and the recess matched with the limit block is formed in the side of the connecting plate (30) towards the rotary disc (29); The driving mechanism includes the motor (17) fixedly installed on the support (1), the output shaft of the motor (17) penetrates the support (1) and is connected with the transmission rod (18), the transmission rod (18) is fixedly installed with the support disc (19), the support (1) is provided with the support assembly connected with the support disc (19) and the pulley (28), and the transmission rod (18) is connected with the adjusting mechanism; The support assembly includes the plurality of sliding grooves (20) that are circumferentially equidistantly arranged and are formed in the support disc (19), the sliding rod (21) is slidably installed in the sliding groove (20), the arc-shaped plate (22) is fixed on the sliding rod (21), and the belt (26) connected with the pulley (28) is sleeved on the arc-shaped plate (22). The adjusting mechanism comprises a movable sleeve (23) movably mounted on the transmission rod (18), a connecting rod (25) hinged to the sliding rod (21) is hinged to the movable sleeve (23), a second spring (24) is sleeved on the transmission rod (18) and abuts against one end of the movable sleeve (23) and the other end of the supporting disc (19), and a limiting assembly connected with the movable sleeve (23) and the opening and closing mechanism is arranged on the feeding hopper (2); The limiting assembly comprises a spiral groove (10) formed in the opening and closing mechanism, a rotating sleeve (11) is fixedly mounted at the bottom of the feeding hopper (2), a protrusion (12) fitted with the spiral groove (10) is fixed on the inner wall of the rotating sleeve (11), and a cam (13) abutting against the movable sleeve (23) is fixed at one end of the rotating sleeve (11) away from the feeding hopper (2); The opening and closing mechanism comprises a hollow rod (3) fixedly mounted in the feeding hopper (2), a supporting rod (4) is movably mounted in the hollow rod (3), a first spring (5) abutting against the hollow rod (3) is sleeved on the supporting rod (4), a driven assembly connected with the supporting rod (4) is arranged in the feeding hopper (2), the driven assembly is connected with the movable plate (8), and the supporting rod (4) is provided with the spiral groove (10).

2. The corn seed screening device for agricultural breeding use according to claim 1, characterized in that, The driven assembly comprises a hollow plate (6) fixedly mounted on the supporting rod (4) and abutting against the first spring (5), symmetrical through grooves (7) are formed in the side walls of the hollow plate (6), a hinge rod (9) hinged to the movable plate (8) and penetrating through the through grooves (7) is hinged in the feeding hopper (2), and the hollow plate (6) is movably connected with the movable plate (8).

3. A method for screening corn seeds for agricultural breeding using the corn seed screening device for agricultural breeding according to claim 1, characterized by, The method comprises the following steps: Step one: corn is poured into the feeding hopper (2), under the action of the gravity of the corn, the opening and closing mechanism is driven to move, thereby driving the movable plate (8) to move towards each other, so that the corn can be conveyed into the sieve plate (16) through the gap formed between the movable plate (8) and the feeding hopper (2); Step two: the driving mechanism is driven to move, and the sieve plate (16) is driven to reciprocate in the horizontal direction through the reciprocating mechanism, so as to screen the corn; Step three: as the amount of corn placed in the feeding hopper (2) gradually increases, the opening and closing mechanism drives the adjusting mechanism to move, under the action of the adjusting mechanism, the reciprocating mechanism is driven to move through the driving mechanism, so that the frequency of reciprocating vibration of the sieve plate (16) is increased, thereby increasing the screening efficiency.

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