CN120325544A

CN120325544A - Corn seed selection and screening device

Info

Publication number: CN120325544A
Application number: CN202510682285.XA
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Shandong Agricultural University
Current assignee: Shandong Agricultural University
Priority date: 2025-05-26
Filing date: 2025-05-26
Publication date: 2025-07-18

Abstract

The present invention discloses a corn seed breeding screening device, comprising a screening box, a screen is arranged inside the screening box, a hopper is connected to the top of the screening box, and a quantitative feeding mechanism for quantitatively discharging corn seeds is arranged on the screening box; the quantitative feeding mechanism comprises a circular plate rotatably connected to the top wall of the screening box, two through holes are penetrated through the top of the circular plate, a discharge pipe is connected to the bottom of the two through holes, and the bottom of the hopper extends to the inside of the screening box. The present invention relates to the technical field of corn breeding. The corn seed breeding screening device realizes quantitative discharging of corn seeds through the setting of the quantitative feeding mechanism, avoids discharging too much corn seeds at one time, causing the screen to overload, prevents seeds from piling up on the screen, and allows the screen to screen out impurities such as deflated grains, broken grains, straw debris, dust, etc. in corn seeds with maximum efficiency, thereby improving the breeding quality of seeds.

Description

Corn seed selective breeding screening device

Technical Field

The invention relates to the technical field of corn seed selection, in particular to a corn seed selection screening device.

Background

In the corn planting process, high-quality seeds are one of key factors for ensuring high and stable yield. After harvesting, corn seeds are often mixed with various impurities, such as shrunken grains, broken grains, straw scraps, dust and the like, and the sizes and plumpness of the seeds are different.

The chinese patent application with publication No. CN221493232U discloses a corn seed screening mechanism, this patent application has solved when sieving corn seeds, can't distinguish lighter piece in to corn seeds and heavier stone, has reduced the screening efficiency to corn seeds, can't effectually discharge impurity, after many times screening of the screen cloth of corn seeds, need dismantle the screen cloth, the inconvenient screen cloth of in the device is changed and the clearance is difficult to maintain screening corn seed mechanism's problem, but current screening plant still has following not enough when carrying out selective breeding screening to corn seeds:

(1) If a large amount of seeds are poured in at a time, the screen is easy to overload, and impurities such as shrunken grains, broken grains, straw scraps, dust and the like cannot be quickly screened out, so that the breeding quality is affected;

(2) In the screening process, straw scraps and dust in corn seeds cannot be removed quickly, long-time screening operation is often needed to screen out, and scraps and dust are easy to fly in the device during screening, so that the scraps and dust cannot be deposited quickly for screening out;

to this end we propose a maize seed selection screening device to solve the above-mentioned problems.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a corn seed breeding and screening device, which solves the problems in the background art.

The corn seed selecting and screening device comprises a screening box, wherein a screen is arranged in the screening box, the top of the screening box is communicated with a hopper, and a quantitative feeding mechanism for quantitatively discharging corn seeds is arranged on the screening box;

The quantitative feeding mechanism comprises a circular plate which is rotationally connected to the top wall of the screening box, two through holes are formed in the top of the circular plate in a penetrating mode, a discharging pipe is communicated with the bottom of the through holes, the bottom of the hopper extends to the inside of the screening box and is flush with the top of the circular plate, an L-shaped plate is fixed to the inner wall of the screening box, a limiting ring is fixed to the L-shaped plate, an inclined plane is formed in the bottom of the limiting ring, the top of the limiting ring is in contact with the bottom of the circular plate, two bottom ends of the discharging pipe are all connected with a pipe cover through pin shafts in a rotating mode, a connecting rod is fixed to the pin shafts, a ball is fixed to one end of the connecting rod, the outer surface of the ball is in contact with the bottom of the limiting ring, and the inclined plane is in contact with the bottom of the limiting ring, and a driving assembly for driving the circular plate to rotate intermittently at 180 degrees is arranged at the top of the screening box.

Preferably, the drive assembly is including rotating the montant of connection at screening case top, be fixed with half gear on the montant, the top of box is fixed with L type seat, the top of L type seat is fixed with motor one, motor one drives the montant and rotates, the top of plectane is fixed with full gear through the transmission shaft, full gear and half gear engagement.

Preferably, a cross plate is fixed on one side of the screening box, a plurality of air nozzles are installed on one side of the cross plate, a square frame is fixed on one side of the screening box, a moving block is connected to the inside of the square frame in a sliding mode, a handle is fixed on one side of the moving block, a rubber surface is arranged on the other side of the moving block, and an air outlet pipe is communicated with one side of the screening box.

Preferably, a wind direction adjusting mechanism is arranged between the screening box and the vertical rod, the wind direction adjusting mechanism is used for adjusting the wind direction of wind sprayed by the air tap, the wind direction adjusting mechanism comprises a square box fixed at the top of the screening box, a rotating roller is rotationally connected between the inner walls of the square box, a wave groove is formed in the surface of the rotating roller, a U-shaped frame is slidingly connected to the bottom of the square box, the top of the U-shaped frame extends to the inside of the square box, and convex columns are fixed on opposite sides of the inner walls of the U-shaped frame.

Preferably, two opposite ends of the convex columns all extend to the inside of the wave groove, the convex columns slide in the wave groove, the bottoms of the U-shaped frames extend to the inside of the screening box, racks are fixed at the bottoms of the U-shaped frames, rotating rods are connected between inner walls of the screening box, wind shields are fixed on the rotating rods, driving gears are fixed on the rotating rods and meshed with the racks, belt pulleys I are fixed on transmission shafts of the vertical rods and the rotating rollers, and the two belt pulleys I are connected through belt one transmission.

Preferably, still be provided with on the screening case and carry out the tiling unit of evenly tiling on the screen cloth with the maize seed after the ration unloading, tiling unit is including fixing the L type platform in screening incasement wall one side, one side of L type platform is fixed with two fixing bases, two be fixed with the horizontal pole between the opposite side of fixing base, sliding connection has the slide on the horizontal pole, the bottom of slide is fixed with the pole setting, sliding connection has the slider in the pole setting, one side of slider is fixed with the pushing plate, one side of screening case is fixed with motor two, the output of motor two is fixed with the square.

Preferably, the inner surface sliding connection of square has the slide bar, the one end of slide bar is fixed with L type piece, one side of L type piece rotates with one side of slider to be connected, the surface cover of slide bar is equipped with spring one, one end and the one side of L type piece of spring one are fixed, the other end and the one side of square of spring one are fixed.

Preferably, four bottom plates are fixed on the inner wall of the screening box, four springs II are fixed between the top of the bottom plates and the bottom of the screen, two driving rods are connected between the inner wall of the screening box in a rotating mode, cams are fixed on the driving rods, the outer surfaces of the cams are extruded in contact with the bottom of the screen, one ends of the driving rods penetrate through the screening box and extend to the outside of the screening box, two belt pulleys II are fixed at one ends of the driving rods, two belt pulleys II are connected through belt two transmission, one side of the screening box is fixed with a mounting plate, a motor III is fixed at the top of the mounting plate, one driving rod is driven to rotate by the motor III, and one side of the screening box is connected with a material receiving box in a sliding mode.

Advantageous effects

The invention provides a corn seed breeding and screening device. Compared with the prior art, the method has the following beneficial effects:

(1) Through the setting of ration feed mechanism, realized the ration unloading to the maize seed, avoided maize seed disposable unloading too much, cause the screen cloth to overload, prevent that the seed from piling up on the screen cloth, can let screen cloth maximum efficiency's screen cloth remove impurity such as flat grain, broken grain, straw piece, dust in the maize seed, promote the breeding quality of seed.

(2) Through the cooperation of air cock and face of gluing use, at corn seed ration unloading in-process, the air cock blows out the wind and carries out the selection by winnowing to the seed, blows straw piece in the seed, dust to the face of gluing on adhere, avoided straw piece and dust to fly upward in the screening, promoted the efficiency of screening, through wind direction adjustment mechanism's setting, in quantitative unloading in-process, can in time adjust and change the angle of blowing, make straw piece, dust can be blown to the face of gluing on evenly and adhere, make tiny impurity in the seed screen more abundant, reduced the time of screening.

(3) Through tiling unit's setting, utilize the anticlockwise rectangle orbit of pushing plate to remove after utilizing the ration feed mechanism to feed at the left side at screen cloth top with seed unloading, carry out pushing tiling with the maize seed circulation on the screen cloth right, further promote screening efficiency, increase screening effect.

Drawings

FIG. 1 is a perspective view of an external structure of the present invention;

FIG. 2 is a perspective view of the outer structure of the present invention;

FIG. 3 is a perspective view of the internal structure of the screening box of the present invention;

FIG. 4 is a linkage state diagram of the dosing mechanism and the wind direction adjustment mechanism of the present invention;

FIG. 5 is a bottom view of the dosing mechanism of the present invention;

FIG. 6 is a perspective view of a wind direction adjustment mechanism of the present invention;

FIG. 7 is a perspective view of a tiling unit of the present invention;

Fig. 8 is a partial structural perspective view of the present invention.

In the figure, 1, a screening box; 2, screening; 3, hopper, 4, dosing mechanism, 5, driving assembly, 6, cross plate, 7, air tap, 8, square frame, 9, moving block, 10, handle, 11, rubber surface, 12, air outlet pipe, 13, wind direction adjusting mechanism, 14, tiling unit, 15, bottom plate, 16, spring two, 17, driving rod, 18, cam, 19, belt pulley two, 20, belt two, 21, mounting plate, 22, motor three, 23, receiving box, 41, circular plate, 42, through hole, 43, discharging pipe, 44, L-shaped plate, 45, limiting ring, 46, inclined plane, 47, pipe cover, 48, connecting rod, 49, ball, 51, vertical rod, 52, half gear, 53, L-shaped seat, 54, motor one, 55, all gear, 131, square box, 132, rotating roller, 133, wave groove, 134, U-shaped frame, 135, convex column, 136, rack, 137, rotary rod, 138, wind deflector 139, driving gear, 1310, belt one, 1, belt one, 141, L-shaped table, 142, motor one, 142, 146, square rod, 146, slide, 1412, slide bar, slide block, 1412.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The embodiment of the invention provides three technical schemes, which specifically comprise the following embodiments:

1 referring to fig. 1-5, a corn seed selecting and screening device comprises a screening box 1, wherein one side of the screening box 1 is provided with a box door, the box door is arranged to open the box door to take out qualified seeds after screening of corn seeds is completed, the box door is not shown in the figure, a screen 2 is arranged in the screening box 1, when the screen 2 vibrates, impurities such as flat grains, broken grains, straw scraps and dust in the corn seeds can be screened out, qualified large-grain seeds are left on the screen 2, the top of the screening box 1 is communicated with a hopper 3, the corn seeds are poured into the hopper 3, the seeds in the hopper 3 are gradually filled into a feeding and discharging pipe 43 for blanking, and a quantitative feeding mechanism 4 for quantitatively blanking the corn seeds is arranged on the screening box 1;

The quantitative feeding mechanism 4 comprises a circular plate 41 which is rotationally connected to the top wall of the screening box 1, two through holes 42 are formed in the top of the circular plate 41 in a penetrating mode, the through holes 42 are formed in the top of the circular plate 41 in a penetrating mode, corn seeds in the hopper 3 can fall into the discharging pipes 43, each time the circular plate 41 rotates for 180 degrees, the bottom ends of the hopper 3 are aligned with the through holes 42, the bottoms of the two through holes 42 are communicated with the discharging pipes 43, the bottom ends of the hopper 3 extend to the inside of the screening box 1 and are flush with the top of the circular plate 41, an L-shaped plate 44 is fixed to the inner wall of the screening box 1, a limiting ring 45 is fixed to the L-shaped plate 44, the limiting ring 45 is fixed to the L-shaped plate 44, an inclined surface 46 is formed in the bottom of the limiting ring 45, the inclined surface 46 is arranged to enable the height of a round ball 49 to rise, then the tube cover 47 is opened, the top of the limiting ring 45 is contacted with the bottom of the circular plate 41, the bottom ends of the two discharging pipes 43 are all connected with the tube cover 47 through pin shafts in a rotating mode, when the round ball 49 rotates to the inclined surface 46, the round ball cover 47 is automatically opened under the influence of gravity, corn seeds in the discharging pipes 43 are blanked, one end 48 is fixed to the pin shaft, one end of the limiting rod 45 is fixed to the end of the round ball 45, and the limiting ring 45 is fixed to the end of the round ball 45 and the end of the round ball 45 is in contact with the top of the round plate 5, and the round plate 45 is in the intermittent mode, and the top of the round plate 5 is in contact with the top surface of the round plate 5, and is in contact with the round surface of the round plate 5, which is in contact with the round surface, and is in contact with the round box, and the top, and the 5.

The driving assembly 5 comprises a vertical rod 51 which is rotationally connected to the top of the screening box 1, a half gear 52 is fixed on the vertical rod 51, an L-shaped seat 53 is fixed on the top of the box body, a motor 54 is fixed on the top of the L-shaped seat 53, the motor 54 is controlled by an external switch and is electrically connected with an external power supply, the motor 54 drives the vertical rod 51 to rotate, a full gear 55 is fixed on the top of the circular plate 41 through a transmission shaft, the full gear 55 is meshed with the half gear 52, the motor 54 drives the half gear 52 to rotate for one circle, and the half gear 52 drives the full gear 55 and the circular plate 41 to rotate for one half circle, namely 180 degrees.

Through the setting of dosing mechanism 4, realized the ration unloading to the maize seed, avoided maize seed disposable unloading too much, cause screen cloth 2 overload, prevent that the seed from piling up on screen cloth 2, can let screen cloth 2 the impurity such as flat grain, broken grain, straw piece, dust in the biggest efficient screen cloth removes the maize seed, promotes the selective breeding quality of seed.

One side of screening case 1 is fixed with diaphragm 6, a plurality of air cock 7 are installed to one side of diaphragm 6, air cock 7 is connected with outside air pump through the trachea, the blowout is gaseous after the air pump starts, carry out the selection by winnowing to corn seeds, one side of screening case 1 is fixed with square frame 8, the inside sliding connection of square frame 8 has movable block 9, one side of movable block 9 is fixed with handle 10, the opposite side of movable block 9 is glued face 11, glue face 11 has the viscidity, can adhere the tiny impurity such as straw piece in the corn seeds, dust, pulling handle 10, can take out movable block 9, clear up impurity on the face 11, one side intercommunication of screening case 1 has out tuber pipe 12, the setting of tuber pipe 12 can let the wind that air cock 7 blown out, be provided with tiny filter screen on the tuber pipe 12 simultaneously, avoid tiny impurity such as straw piece, dust to be blown to the external world.

Based on embodiment 1, as shown in fig. 6, a wind direction adjusting mechanism 13 is disposed between the screening box 1 and the vertical rod 51, the wind direction adjusting mechanism 13 is used for adjusting wind direction of wind sprayed by the air tap 7, the wind direction adjusting mechanism 13 comprises a square box 131 fixed at the top of the screening box 1, a rotary roller 132 is rotatably connected between inner walls of the square box 131, a wave groove 133 is formed on the surface of the rotary roller 132, a U-shaped frame 134 is slidably connected to the bottom of the square box 131, the top of the U-shaped frame 134 extends to the inside of the square box 131, and protruding columns 135 are fixed on opposite sides of the inner wall of the U-shaped frame 134, when the rotary roller 132 rotates, the wave groove 133 is driven to rotate, and then the protruding columns 135 are driven to slide up and down in the wave groove 133, and then the U-shaped frame 134 is driven to reciprocate up and down.

Opposite ends of the two convex columns 135 extend to the inside of the wavy groove 133, the convex columns 135 slide in the wavy groove 133, the bottom of the U-shaped frame 134 extends to the inside of the screening box 1, a rack 136 is fixed at the bottom of the U-shaped frame 134, a rotating rod 137 is rotatably connected between inner walls of the screening box 1, a wind shield 138 is fixed on the rotating rod 137, the wind direction of the wind shield 138 can be continuously changed when the wind shield 138 rotates in a reciprocating mode, a driving gear 139 is fixed on the rotating rod 137, the driving gear 139 is meshed with the rack 136, a belt pulley one 1310 is fixed on a transmission shaft of the vertical rod 51 and the rotating roller 132, and the two belt pulleys one 1310 are in transmission connection through a belt one 1311.

Through the cooperation of the air tap 7 and the rubber surface 11, in the quantitative blanking process of corn seeds, the air tap 7 blows air to carry out winnowing on the seeds, straw scraps and dust in the seeds are blown to the rubber surface 11 to adhere, the straw scraps and dust are prevented from flying in screening, the screening efficiency is improved, the blowing angle can be timely adjusted and changed through the arrangement of the wind direction adjusting mechanism 13 in the quantitative blanking process, the straw scraps and dust can be uniformly blown to the rubber surface 11 to adhere, the tiny impurities in the seeds are screened out more fully, the screening time is reduced,

Based on embodiment 2, referring to fig. 7-8, a spreading unit 14 for uniformly spreading the quantitatively-fed corn seeds on the screen 2 is further arranged on the screening box 1, the spreading unit 14 comprises an L-shaped table 141 fixed on one side of the inner wall of the screening box 1, two fixing seats 142 are fixed on one side of the L-shaped table 141, a cross rod 143 is fixed between opposite sides of the two fixing seats 142, a sliding seat 144 is connected on the cross rod 143 in a sliding manner, a vertical rod 145 is fixed on the bottom of the sliding seat 144, a sliding block 146 is connected on the vertical rod 145 in a sliding manner, a pushing plate 147 is fixed on one side of the sliding block 146, a motor two 148 is fixed on one side of the screening box 1, the motor two 148 is controlled by an external switch and is electrically connected with an external power supply, a block 149 is fixed on the output end of the motor two 148, and the pushing plate 147 is driven to move in a counterclockwise rectangular track after the motor two 148 is started.

The inner surface of the square block 149 is slidably connected with a sliding rod 1410, one end of the sliding rod 1410 is fixedly provided with an L-shaped block 1411, one side of the L-shaped block 1411 is rotatably connected with one side of the sliding block 146, the outer surface of the sliding rod 1410 is sleeved with a first spring 1412, one end of the first spring 1412 is fixedly provided with one side of the L-shaped block 1411, and the other end of the first spring 1412 is fixedly provided with one side of the square block 149.

Through the setting of tiling unit 14, utilize the anticlockwise rectangle orbit of pushing plate 147 to remove after utilizing the left side of dosing mechanism 4 with seed unloading at screen cloth 2 top, carry out the pushing tiling with the maize seed circulation on the screen cloth 2 right, further promote screening efficiency, increase screening effect.

Four bottom plates 15 are fixed on the inner wall of the screening box 1, springs II 16 are fixed between the tops of the four bottom plates 15 and the bottom of the screen 2, two driving rods 17 are connected between the inner wall of the screening box 1 in a rotating mode, cams 18 are fixed on the two driving rods 17, the screen 2 can vibrate up and down when the cams 18 rotate, corn seeds are screened, the outer surface of each cam 18 is in contact extrusion with the bottom of the screen 2, one end of each driving rod 17 penetrates through the screening box 1 and extends to the outside of the screening box 1, pulleys II 19 are fixed at one end of each driving rod 17, the two pulleys II 19 are connected through belt II 20 in a transmission mode, a mounting plate 21 is fixed at one side of the screening box 1, a motor III 22 is fixed at the top of the mounting plate 21, the motor III 22 is controlled by an external switch and is electrically connected with an external power supply, the motor III 22 drives one driving rod 17 to rotate, the output end of the motor III 22 is fixed with one end of one driving rod 17 through a coupler, one side of the screening box 1 is in a sliding connection with a material receiving box 23, and the material receiving box 23 is used for collecting flat particles, broken particles and the like.

And all that is not described in detail in this specification is well known to those skilled in the art.

During operation, corn seeds are poured into the hopper 3, part of the seeds enter the discharging pipe 43 through the through hole 42 for temporary storage, the motor I54 is started, the motor I54 drives the half gear 52 to rotate for one circle, the half gear 52 drives the full gear 55 to rotate for half circle, the circular plate 41 is driven to rotate for 180 degrees, the discharging pipe 43 with the corn seeds is driven to rotate to the left side, the round ball 49 contacts and slides with the inclined plane 46, the pipe cover 47 is opened under the influence of gravity, the seeds of the discharging pipe 43 are quantitatively discharged and gradually fall onto the screen 2, the left discharging pipe 43 synchronously rotates to the right side, the round ball 49 slides with the bottom of the limiting ring 45, the pipe cover 47 is further closed, the discharging pipe 43 rotates for 180 degrees to the lower part of the hopper 3 for quantitative material receiving, the rotary roller 132 is synchronously driven to rotate in the process of rotating the vertical rod 51, the convex column 135 is driven to slide up and down in the wave groove 133 during rotation of the rotary roller 132, further driving the U-shaped frame 134 and the rack 136 to reciprocate up and down, further driving the driving gear 139 and the wind guard 138 to reciprocate forward and backward, starting the air tap 7, enabling the air tap 7 to jet air, carrying out air separation on the corn seeds with falling discharge, blowing away straw scraps and dust in the corn seeds and adhering the corn seeds on the rubber surface 11, adjusting the blowing angle when the wind guard 138 rotates, uniformly blowing the straw scraps and dust on the rubber surface 11, after the corn seeds fall on the left side of the top of the screen 11, starting the motor 148, driving the block 149 to rotate by the motor 148, further driving the slide block 146 to slide up and down on the upright 145, further enabling the block 149 to slide on the slide bar 1410, extruding the compression spring 1412, further driving the slide 144 to slide left and right along the cross rod 143, finally driving the pushing plate 147 to carry out anticlockwise rectangular track movement, circularly pushing the corn seeds to the right, and starting the motor III 22, so that the motor III 22 drives the cam 18 to rotate, further drives the screen 2 to vibrate up and down, further screens corn seeds, and drops the shrunken grains and crushed grains therein into the receiving box 23 to collect, and opens a box door on the screening box 1 to take out qualified corn seeds.

The foregoing detailed description of the embodiments of the invention has been provided for the purpose of illustrating the preferred embodiments of the invention and is not to be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.

Claims

1. The corn seed breeding and screening device comprises a screening box (1) and is characterized in that a screen (2) is arranged in the screening box (1), a hopper (3) is communicated with the top of the screening box (1), and a quantitative feeding mechanism (4) for quantitatively discharging corn seeds is arranged on the screening box (1);

The utility model provides a screening box, including rotating disc (41) of being connected on screening box (1) roof, two through-holes (42) have been run through at the top of disc (41), two the bottom intercommunication of through-hole (42) has discharging pipe (43), the bottom of hopper (3) extends to the inside of screening box (1), and with the top parallel and level of disc (41), be fixed with L template (44) on the inner wall of screening box (1), be fixed with spacing ring (45) on L template (44), inclined plane (46) have been seted up to the bottom of spacing ring (45), the top of spacing ring (45) and the bottom contact of disc (41), two the bottom of discharging pipe (43) all is connected with tube cap (47) through the round pin axle rotation, and is fixed with connecting rod (48) on the round pin axle, the one end of connecting rod (48) is fixed with ball (49), the surface and the bottom and inclined plane (46) contact of spacing ring (45) of ball (49), the top of screening box (1) is provided with the rotatory intermittent type subassembly (5) of drive of 180 degrees.

2. The corn seed breeding and screening device according to claim 1, wherein the driving assembly (5) comprises a vertical rod (51) rotatably connected to the top of the screening box (1), a half gear (52) is fixed on the vertical rod (51), an L-shaped seat (53) is fixed on the top of the box (), a motor I (54) is fixed on the top of the L-shaped seat (53), the motor I (54) drives the vertical rod (51) to rotate, an all gear (55) is fixed on the top of the circular plate (41) through a transmission shaft, and the all gear (55) is meshed with the half gear (52).

3. The corn seed breeding and screening device according to claim 1, wherein a transverse plate (6) is fixed on one side of the screening box (1), a plurality of air nozzles (7) are installed on one side of the transverse plate (6), a square frame (8) is fixed on one side of the screening box (1), a moving block (9) is connected inside the square frame (8) in a sliding mode, a handle (10) is fixed on one side of the moving block (9), a rubber surface (11) is arranged on the other side of the moving block (9), and an air outlet pipe (12) is communicated with one side of the screening box (1).

4. The corn seed breeding and screening device according to claim 2, wherein a wind direction adjusting mechanism (13) is arranged between the screening box (1) and the vertical rod (51), the wind direction adjusting mechanism (13) is used for adjusting the wind direction of wind sprayed by the air tap (7), the wind direction adjusting mechanism (13) comprises a square box (131) fixed at the top of the screening box (1), a rotating roller (132) is rotatably connected between the inner walls of the square box (131), a wave groove (133) is formed in the surface of the rotating roller (132), a U-shaped frame (134) is slidably connected to the bottom of the square box (131), the top of the U-shaped frame (134) extends into the square box (131), and convex columns (135) are fixed on opposite sides of the inner walls of the U-shaped frame (134).

5. The corn seed breeding and screening device according to claim 4, wherein the opposite ends of the two protruding columns (135) extend to the inside of the wavy groove (133), the protruding columns (135) slide in the wavy groove (133), the bottom of the U-shaped frame (134) extends to the inside of the screening box (1), a rack (136) is fixed at the bottom of the U-shaped frame (134), a rotating rod (137) is rotatably connected between the inner walls of the screening box (1), a wind shield (138) is fixed on the rotating rod (137), a driving gear (139) is fixed on the rotating rod (137), the driving gear (139) is meshed with the rack (136), a belt pulley I (1310) is fixed on the transmission shafts of the vertical rod (51) and the rotating roller (132), and the two belt pulleys I (1310) are in transmission connection through the belt I (1311).

6. The corn seed breeding and screening device according to claim 1, wherein the screening box (1) is further provided with a tiling unit (14) for tiling the corn seeds subjected to quantitative blanking on the screen (2) uniformly, the tiling unit (14) comprises an L-shaped table (141) fixed on one side of the inner wall of the screening box (1), two fixing bases (142) are fixed on one side of the L-shaped table (141), a cross rod (143) is fixed between opposite sides of the two fixing bases (142), a sliding seat (144) is connected onto the cross rod (143) in a sliding mode, a vertical rod (145) is fixed at the bottom of the sliding seat (144), a sliding block (146) is connected onto the vertical rod (145), a pushing plate (147) is fixed on one side of the sliding block (146), a motor II (148) is fixed on one side of the screening box (1), and a square block (149) is fixed at the output end of the motor II (148).

7. The corn seed selection and screening device according to claim 6, wherein the inner surface of the square block (149) is slidably connected with a sliding rod (1410), one end of the sliding rod (1410) is fixedly provided with an L-shaped block (1411), one side of the L-shaped block (1411) is rotatably connected with one side of the sliding block (146), the outer surface of the sliding rod (1410) is sleeved with a first spring (1412), one end of the first spring (1412) is fixedly connected with one side of the L-shaped block (1411), and the other end of the first spring (1412) is fixedly connected with one side of the square block (149).

8. The corn seed breeding and screening device according to claim 1, wherein four bottom plates (15) are fixed on the inner wall of the screening box (1), springs two (16) are fixed between the tops of the four bottom plates (15) and the bottoms of the screening net (2), two driving rods (17) are rotatably connected between the inner walls of the screening box (1), cams (18) are fixed on the two driving rods (17), the outer surface of each cam (18) is in contact extrusion with the bottoms of the screening net (2), one ends of the two driving rods (17) penetrate through the screening box (1) and extend to the outer portion of the screening box (1), belt pulleys two (19) are fixed at one ends of each driving rod (17), two belt pulleys two (19) are in transmission connection through a belt two (20), a mounting plate (21) is fixed on one side of the screening box (1), a motor three (22) is fixed on the top of the mounting plate (21), the motor three (22) drives one driving rod (17) to rotate, and one side of the screening box (1) is connected with a material box (23) in a sliding mode.