Corn seed breeding and screening device

Abstract

The invention discloses a corn seed breeding and screening device which comprises a screening box, 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; and the quantitative feeding mechanism comprises a circular plate 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, the bottoms of the two through holes communicate with a discharging pipe, and the bottom end of the hopper extends into the screening box. According to the corn seed breeding and screening device, through the arrangement of the quantitative feeding mechanism, quantitative discharging of corn seeds is achieved, the situation that too much corn seeds are discharged at a time, a screen is overloaded, the seeds are prevented from being stacked on the screen, and the screen can screen out shriveled grains, broken grains, straw chippings, dust and other impurities in the corn seeds at the maximum efficiency; the seed breeding quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of corn breeding, in particular to a corn seed breeding screening device. Background Art

[0002] In the process of corn planting, high-quality seeds are one of the key factors to ensure high and stable yields. After harvesting, corn seeds are usually mixed with various impurities, such as shriveled kernels, broken kernels, straw debris, dust, etc., and the size and fullness of the seeds themselves are also different.

[0003] The Chinese patent application with publication number CN221493232U discloses a corn seed screening mechanism. The patent application solves the problem that when screening corn seeds, the lighter debris and heavier stones in the corn seeds cannot be distinguished, the screening efficiency of the corn seeds is reduced, and the impurities cannot be effectively discharged. After the corn seed screen has been screened for many times, the screen needs to be disassembled. The screen in the device is not convenient for replacement and cleaning, and it is not easy to maintain the screening corn seed mechanism. However, the existing screening device still has the following shortcomings when screening corn seeds:

[0004] (1) If a large amount of seeds are poured in at once, the screen will be overloaded and some impurities such as shrunken seeds, broken seeds, straw debris, dust, etc. cannot be quickly screened out, affecting the quality of breeding;

[0005] (2) During the screening process, the straw debris and dust in the corn seeds cannot be quickly removed, and often require a long screening operation to screen out. In addition, the debris and dust are also easy to fly in the device during screening and cannot be quickly settled for screening;

[0006] Therefore, we proposed a corn seed breeding and screening device to solve the above problems. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a corn seed breeding and screening device, which solves the problems raised in the background technology.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: 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 feeding corn seeds is arranged on the screening box;

[0009] The quantitative feeding mechanism includes a circular plate rotatably connected to the top wall of the screening box, two through holes are provided on the top of the circular plate, and the bottoms of the two through holes are connected to discharge pipes, the bottom end of the hopper extends to the interior of the screening box and is flush with the top of the circular plate, an L-shaped plate is fixed on the inner wall of the screening box, a limiting ring is fixed on the L-shaped plate, a slope is provided on the bottom of the limiting ring, the top of the limiting ring contacts the bottom of the circular plate, the bottom ends of the two discharge pipes are rotatably connected to pipe covers via pins, and a connecting rod is fixed on the pin, a ball is fixed to one end of the connecting rod, and the outer surface of the ball contacts the bottom and the slope of the limiting ring, and a driving component for driving the circular plate to intermittently rotate 180 degrees is provided on the top of the screening box.

[0010] Preferably, the driving assembly includes a vertical rod rotatably connected to the top of the screening box, a half gear is fixed on the vertical rod, an L-shaped seat is fixed on the top of the box body, a motor 1 is fixed on the top of the L-shaped seat, the motor 1 drives the vertical rod to rotate, and a full gear is fixed on the top of the circular plate through a transmission shaft, and the full gear is meshed with the half gear.

[0011] Preferably, a horizontal plate is fixed on one side of the screening box, a plurality of air nozzles are installed on one side of the horizontal plate, a square frame is fixed on one side of the screening box, a moving block is slidably connected to the inside of the square frame, a handle is fixed on one side of the moving block, the other side of the moving block is a rubber surface, and an air outlet duct is connected to one side of the screening box.

[0012] Preferably, a wind direction adjusting mechanism is provided between the screening box and the vertical rod, and the wind direction adjusting mechanism is used to adjust the wind direction of the wind ejected from the air nozzle. The wind direction adjusting mechanism comprises a square box fixed on the top of the screening box, a roller is rotatably connected between the inner walls of the square box, a wave groove is provided on the surface of the roller, a U-shaped frame is slidably connected to the bottom of the square box, the top of the U-shaped frame extends to the interior of the square box, and convex columns are fixed on opposite sides of the inner wall of the U-shaped frame.

[0013] Preferably, the opposite ends of the two bosses extend to the interior of the wave groove, and the bosses slide inside the wave groove, the bottom of the U-shaped frame extends to the interior of the screening box, a rack is fixed to the bottom of the U-shaped frame, a rotating rod is rotatably connected between the inner walls of the screening box, a windshield is fixed on the rotating rod, a driving gear is fixed on the rotating rod, the driving gear is meshed with the rack, a pulley is fixed on the transmission shaft of the vertical rod and the roller, and the two pulleys are connected by a belt transmission.

[0014] Preferably, the screening box is also provided with a spreading unit for evenly spreading the corn seeds after quantitative feeding on the screen, the spreading unit comprises an L-shaped table fixed to one side of the inner wall of the screening box, two fixed seats are fixed on one side of the L-shaped table, a cross bar is fixed between the opposite sides of the two fixed seats, a sliding seat is slidably connected to the cross bar, a vertical pole is fixed to the bottom of the sliding seat, a sliding block is slidably connected to the vertical pole, a pushing plate is fixed to one side of the sliding block, a motor 2 is fixed to one side of the screening box, and a block is fixed to the output end of the motor 2.

[0015] Preferably, the inner surface of the block is slidably connected to a sliding rod, an L-shaped block is fixed to one end of the sliding rod, one side of the L-shaped block is rotatably connected to one side of the slider, and a spring 1 is sleeved on the outer surface of the sliding rod, one end of the spring 1 is fixed to one side of the L-shaped block, and the other end of the spring 1 is fixed to one side of the block.

[0016] Preferably, four bottom plates are fixed on the inner wall of the screening box, and two springs are fixed between the tops of the four bottom plates and the bottom of the screen, and two driving rods are rotatably connected between the inner walls of the screening box, and cams are fixed on the two driving rods, and the outer surfaces of the cams are in contact and extruded with the bottom of the screen, and one end of the two driving rods passes through the screening box and extends to the outside of the screening box, and one end of the two driving rods is fixed with two pulleys, and the two pulleys are connected by two belts for transmission, and a mounting plate is fixed on one side of the screening box, and a motor three is fixed on the top of the mounting plate, and the motor three drives one of the driving rods to rotate, and a material receiving box is slidably connected to one side of the screening box.

[0017] Beneficial Effects

[0018] The present invention provides a corn seed breeding and screening device. Compared with the prior art, it has the following beneficial effects:

[0019] (1) The quantitative feeding mechanism is used to achieve quantitative feeding of corn seeds, thereby avoiding excessive feeding of corn seeds at one time, which would cause overload of the screen and prevent seeds from accumulating on the screen. The screen can screen out impurities such as empty grains, broken grains, straw debris, and dust from corn seeds with maximum efficiency, thereby improving the quality of seed selection.

[0020] (2) Through the coordinated use of the air nozzle and the rubber surface, during the quantitative feeding process of corn seeds, the air nozzle blows out air to select the seeds, and blows the straw debris and dust in the seeds to the rubber surface for adhesion, thereby avoiding the straw debris and dust from flying during screening and improving the screening efficiency. Through the setting of the wind direction adjustment mechanism, during the quantitative feeding process, the blowing angle can be adjusted and changed in time, so that the straw debris and dust can be evenly blown to the rubber surface for adhesion, so that the fine impurities in the seeds can be screened out more fully, reducing the screening time.

[0021] (3) Through the setting of the tiling unit, after the seeds are fed onto the left side of the top of the sieve by the metering feeding mechanism, the pusher plate moves along a counterclockwise rectangular trajectory to push and tile the corn seeds on the sieve to the right in a cycle, further improving the screening efficiency and enhancing the screening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the three-dimensional external structure of the present invention Figure 1 ;

[0023] Figure 2 is the three-dimensional external structure of the present invention Figure 2 ;

[0024] Figure 3 is the three-dimensional internal structure diagram of the screening box of the present invention;

[0025] Figure 4 is the linkage state diagram of the metering feeding mechanism and the wind direction adjusting mechanism of the present invention;

[0026] Figure 5 is the bottom view of the metering feeding mechanism of the present invention;

[0027] Figure 6 is the three-dimensional diagram of the wind direction adjusting mechanism of the present invention;

[0028] Figure 7 is the three-dimensional diagram of the tiling unit of the present invention;

[0029] Figure 8 is the three-dimensional diagram of the partial structure of the present invention.

[0030] In the figure: 1, screening box; 2, screen mesh; 3, hopper; 4, quantitative feeding mechanism; 5, drive assembly; 6, cross plate; 7, air nozzle; 8, square box; 9, moving block; 10, handle; 11, rubber surface; 12, air outlet pipe; 13, wind direction adjusting mechanism; 14, paving unit; 15, bottom plate; 16, second spring; 17, drive rod; 18, cam; 19, second pulley; 20, second belt; 21, mounting plate; 22, third motor; 23, receiving box; 41, circular plate; 42, through hole; 43, discharge pipe; 44, L-shaped plate; 45, limiting ring; 46, inclined surface; 47, pipe cover; 48, connecting rod; 49, spherical ball; 51, vertical rod; 52, half gear; 53, L-shaped seat; 54, first motor; 55, full gear; 131, square box; 132, rotating roller; 133, wave groove; 134, U-shaped frame; 135, convex column; 136, rack; 137, rotating rod; 138, wind shield; 139, driving gear; 1310, first pulley; 1311, first belt; 141, L-shaped table; 142, fixed seat; 143, cross bar; 144, sliding seat; 145, vertical rod; 146, sliding block; 147, pushing plate; 148, second motor; 149, square block; 1410, sliding rod; 1411, L-shaped block; 1412, first spring. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] The embodiments of the present invention provide three technical solutions, specifically including the following embodiments:

[0033] Embodiment 1: Please refer to Figure 1 - Figure 5 , a corn seed breeding and screening device, including a screening box 1. A box door is provided on one side of the screening box 1. The box door can be opened to take out the qualified seeds after the screening of corn seeds is completed. The box door is not shown in the figure. A screen mesh 2 is arranged inside the screening box 1. When the screen mesh 2 vibrates, impurities such as shriveled grains, broken grains, straw debris, and dust in the corn seeds can be screened out, and the qualified plump large-grain seeds remain on the screen mesh 2. A hopper 3 is connected to the top of the screening box 1. The corn seeds are poured into the hopper 3, and the seeds in the hopper 3 are gradually filled into the discharge pipe 43 for feeding. A quantitative feeding mechanism 4 for quantitatively feeding the corn seeds is arranged on the screening box 1;

[0034] The metering feeding mechanism 4 includes a circular plate 41 rotatably connected to the top wall of the screening box 1. Two through holes 42 are formed through the top of the circular plate 41. The arrangement of the through holes 42 allows the corn seeds in the hopper 3 to fall into the discharge pipe 43. Every time the circular plate 41 rotates 180 degrees, the bottom end of the hopper 3 aligns with the through holes 42. The bottoms of the two through holes 42 are communicated with a discharge pipe 43. The bottom end of the hopper 3 extends into the interior of the screening box 1 and is 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, and a limiting ring 45 is fixed to the L-shaped plate 44. The L-shaped plate 44 is provided for fixing the limiting ring 45. An inclined surface 46 is formed at the bottom of the limiting ring 45. The arrangement of the inclined surface 46 can raise the height of the spherical ball 49, thereby opening the pipe cover 47. The top of the limiting ring 45 contacts the bottom of the circular plate 41. The bottom ends of the two discharge pipes 43 are each rotatably connected to a pipe cover 47 through a pin shaft. When the spherical ball 49 rotates to the inclined surface 46, the pipe cover 47 automatically opens under the influence of gravity, and the corn seeds in the discharge pipe 43 fall. A connecting rod 48 is fixed to the pin shaft, and a spherical ball 49 is fixed to one end of the connecting rod 48. The outer surface of the spherical ball 49 contacts the bottom and the inclined surface 46 of the limiting ring 45. A driving assembly 5 for driving the circular plate 41 to perform an intermittent rotation of 180 degrees is arranged on the top of the screening box 1.

[0035] The driving assembly 5 includes a vertical rod 51 rotatably connected to the top of the screening box 1. A half gear 52 is fixed to the vertical rod 51. An L-shaped seat 53 is fixed to the top of the box body. A first motor 54 is fixed to the top of the L-shaped seat 53. The first motor 54 is controlled by an external switch and is electrically connected to an external power supply. The first motor 54 drives the vertical rod 51 to rotate. A full gear 55 is fixed to the top of the circular plate 41 through a transmission shaft. The full gear 55 meshes with the half gear 52. When the first motor 54 drives the half gear 52 to rotate one circle, the half gear 52 drives the full gear 55 and the circular plate 41 to rotate half a circle, that is, 180 degrees.

[0036] Through the arrangement of the metering feeding mechanism 4, the quantitative feeding of corn seeds is realized, avoiding excessive one-time feeding of corn seeds, causing the sieve mesh 2 to be overloaded, preventing seeds from accumulating on the sieve mesh 2, and enabling the sieve mesh 2 to remove impurities such as shriveled grains, broken grains, straw debris, and dust in corn seeds with the highest efficiency, thereby improving the breeding quality of seeds.

[0037] A horizontal plate 6 is fixed to one side of the screening box 1, and a plurality of air nozzles 7 are installed on one side of the horizontal plate 6. The air nozzles 7 are connected to an external air pump through an air pipe. After the air pump is started, gas is ejected to air select the corn seeds. A square frame 8 is fixed to one side of the screening box 1. A moving block 9 is slidably connected inside the square frame 8. A handle 10 is fixed to one side of the moving block 9, and a rubber surface 11 is provided on the other side of the moving block 9. The rubber surface 11 is sticky and can adhere to fine impurities such as straw debris and dust in the corn seeds. By pulling the handle 10, the moving block 9 can be pulled out to clean the impurities on the rubber surface 11. An air outlet duct 12 is connected to one side of the screening box 1. The setting of the air outlet duct 12 can discharge the wind blown out by the air nozzle 7. At the same time, a fine filter is provided on the air outlet duct 12 to prevent fine impurities such as straw debris and dust from being blown to the outside.

[0038] Example 2: Based on Example 1, see Figure 6 As shown, a wind direction adjusting mechanism 13 is arranged between the screening box 1 and the vertical rod 51, and the wind direction adjusting mechanism 13 is used to adjust the wind direction of the wind sprayed from the air nozzle 7. The wind direction adjusting mechanism 13 includes a square box 131 fixed on the top of the screening box 1, and a roller 132 is rotatably connected between the inner walls of the square box 131. A wave groove 133 is opened on the surface of the roller 132, and 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 interior of the square box 131, and bosses 135 are fixed on the opposite sides of the inner wall of the U-shaped frame 134. When the roller 132 rotates, it drives the wave groove 133 to rotate, and then drives the boss 135 to slide up and down in the wave groove 133, and then drives the U-shaped frame 134 to reciprocate up and down.

[0039] The opposite ends of the two bosses 135 extend to the interior of the wave groove 133, and the bosses 135 slide inside the wave groove 133. The bottom of the U-shaped frame 134 extends to the interior of the screening box 1. A rack 136 is fixed to 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 windshield 138 is fixed on the rotating rod 137. When the windshield 138 reciprocates, it will continuously change the wind direction. A driving gear 139 is fixed on the rotating rod 137. The driving gear 139 is meshed with the rack 136. Pulleys 1310 are fixed on the transmission shafts of the vertical rod 51 and the roller 132. The two pulleys 1310 are connected by a belt 1311.

[0040] Through the combined use of the air nozzle 7 and the rubber surface 11, during the process of quantitatively discharging corn seeds, the air nozzle 7 blows air to perform air separation on the seeds, blowing the straw debris and dust in the seeds onto the rubber surface 11 for adhesion. This avoids the flying of straw debris and dust during screening, improves the screening efficiency. Through the setting of the wind direction adjustment mechanism 13, during the quantitative discharging process, the blowing angle can be adjusted and changed in a timely manner, enabling the straw debris and dust to be evenly blown onto the rubber surface 11 for adhesion, making the fine impurities in the seeds be more fully screened out, and reducing the screening time.

[0041] Embodiment 3: On the basis of Embodiment 2, as shown in Figures 7 - 8 shown, a paving unit 14 for evenly paving the quantitatively discharged corn seeds on the screen mesh 2 is further provided on the screening box 1. The paving unit 14 includes an L-shaped platform 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 platform 141. A cross bar 143 is fixed between the opposite sides of the two fixing seats 142. A sliding seat 144 is slidably connected to the cross bar 143. A vertical rod 145 is fixed to the bottom of the sliding seat 144. A sliding block 146 is slidably connected to the vertical rod 145. A pushing plate 147 is fixed to one side of the sliding block 146. A second motor 148 is fixed on one side of the screening box 1. The second motor 148 is controlled by an external switch and is electrically connected to an external power supply. A square block 149 is fixed to the output end of the second motor 148. After the second motor 148 is started, it drives the pushing plate 147 to move in a counterclockwise rectangular trajectory.

[0042] A sliding rod 1410 is slidably connected to the inner surface of the square block 149. One end of the sliding rod 1410 is fixed with an L-shaped block 1411. One side of the L-shaped block 1411 is rotatably connected to one side of the sliding block 146. A first spring 1412 is sleeved on the outer surface of the sliding rod 1410. One end of the first spring 1412 is fixed to one side of the L-shaped block 1411, and the other end of the first spring 1412 is fixed to one side of the square block 149.

[0043] Through the setting of the paving unit 14, after the seeds are discharged onto the left side of the top of the screen mesh 2 by the quantitative feeding mechanism 4, by using the counterclockwise rectangular trajectory movement of the pushing plate 147, the corn seeds on the screen mesh 2 are cyclically pushed and paved to the right, further improving the screening efficiency and enhancing the screening effect.

[0044] Four bottom plates 15 are fixed on the inner wall of the screening box 1, and springs 16 are fixed between the tops of the four bottom plates 15 and the bottom of the screen 2. Two driving rods 17 are rotatably connected between the inner walls of the screening box 1, and cams 18 are fixed on the two driving rods 17. When the cams 18 rotate, the screen 2 can vibrate up and down to screen the corn seeds. The outer surface of the cam 18 contacts and squeezes the bottom of the screen 2. One end of the two driving rods 17 passes through the screening box 1 and extends to the outside of the screening box 1. One end of the two driving rods 17 is fixed There is a pulley 2 19, and the two pulleys 2 19 are connected by a belt 20. A mounting plate 21 is fixed to one side of the screening box 1, and a motor 3 22 is fixed to the top of the mounting plate 21. The motor 3 22 is controlled by an external switch and is electrically connected to an external power supply. The motor 3 22 drives one of the driving rods 17 to rotate, and the output end of the motor 3 22 is fixed to one end of one of the driving rods 17 through a coupling. A material receiving box 23 is slidably connected to one side of the screening box 1, and the material receiving box 23 is used to collect impurities such as deflated particles and broken particles that are screened out.

[0045] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0046] During operation, pour the corn seeds into the hopper 3. Then, some seeds enter the discharge pipe 43 through the through hole 42 and are temporarily stored. Start the first motor 54. The first motor 54 drives the half gear 52 to rotate one circle. The half gear 52 drives the full gear 55 to rotate half a circle, and then drives the circular plate 41 to rotate 180 degrees, thereby driving the discharge pipe 43 containing corn seeds to rotate to the left. At the same time, the spherical ball 49 contacts and slides on the inclined surface 46, and the pipe cover 47 opens under the influence of gravity. The seeds in the discharge pipe 43 are quantitatively discharged and gradually fall onto the sieve mesh 2. At the same time, the discharge pipe 43 on the left rotates to the right synchronously, and the spherical ball 49 slides on the bottom of the limit ring 45, thereby closing the pipe cover 47. The discharge pipe 43 rotates 180 degrees to the lower part of the hopper 3 for quantitative material receiving. During the rotation of the vertical rod 51, the roller 132 is driven to rotate synchronously. When the roller 132 rotates, the convex column 135 slides up and down in the wave groove 133, thereby driving the U-shaped frame 134 and the rack 136 to move up and down reciprocally, and then driving the driving gear 139 and the wind shield 138 to rotate forward and backward reciprocally. Start the air nozzle 7 to make the air nozzle 7 spray air to perform air separation on the corn seeds falling during discharging, blowing away the straw debris and dust in the corn seeds and adhering them to the rubber surface 11. When the wind shield 138 rotates, the blowing angle can be adjusted, and the straw debris and dust can be evenly blown onto the rubber surface 11. After the corn seeds fall to the left side of the top of the sieve mesh 11, start the second motor 148. The second motor 148 drives the square block 149 to rotate, and then drives the slider 146 to slide up and down on the vertical rod 145, so that the square block 149 slides on the slide rod 1410 and compresses the first compression spring 1412, and then drives the slide seat 144 to slide left and right along the cross bar 143, and finally drives the pusher plate 147 to move in a counterclockwise rectangular trajectory, circulating to push the corn seeds to the right and spread them out. Start the third motor 22 to make the third motor 22 drive the cam 18 to rotate, and then drive the sieve mesh 2 to vibrate up and down, thereby screening the corn seeds, screening out the shriveled grains and broken grains and collecting them in the receiving box 23. Open the door on the screening box 1 to take out the qualified corn seeds.

[0047] The embodiments of the invention have been described in detail above, but the above content is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A corn seed breeding and screening device, comprising a screening box (1), characterized in that: Inside the screening box (1), a sieve mesh (2) is provided. At the top of the screening box (1), a hopper (3) is connected. On the screening box (1), a quantitative feeding mechanism (4) for quantitatively feeding corn seeds is provided. The quantitative feeding mechanism (4) includes a circular plate (41) rotatably connected to the top wall of the screening box (1). Two through holes (42) are formed through the top of the circular plate (41). The bottoms of the two through holes (42) are connected to a discharge pipe (43). The bottom end of the hopper (3) extends into the interior of the screening box (1) and is 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). An inclined surface (46) is formed at the bottom of the limiting ring (45). The top of the limiting ring (45) is in contact with the bottom of the circular plate (41). The bottom ends of the two discharge pipes (43) are rotatably connected to a pipe cover (47) through a pin shaft, and a connecting rod (48) is fixed to the pin shaft. One end of the connecting rod (48) is fixed to a spherical ball (49). The outer surface of the spherical ball (49) is in contact with the bottom of the limiting ring (45) and the inclined surface (46). A driving assembly (5) for driving the circular plate (41) to rotate intermittently by 180 degrees is provided at the top of the screening box (1).

2. The screening device for selecting and breeding corn seeds according to claim 1, wherein: The driving assembly (5) includes a vertical rod (51) rotatably connected to the top of the screening box (1). A semi-gear (52) is fixed to the vertical rod (51). An L-shaped seat (53) is fixed to the top of the box body (). A first motor (54) is fixed to the top of the L-shaped seat (53). The first motor (54) drives the vertical rod (51) to rotate. A full gear (55) is fixed to the top of the circular plate (41) through a transmission shaft. The full gear (55) meshes with the semi-gear (52).

3. The screening device for corn seed breeding according to claim 1, characterized in that: A horizontal plate (6) is fixed to one side of the screening box (1). A plurality of air nozzles (7) are installed on one side of the horizontal plate (6). A square box (8) is fixed to one side of the screening box (1). A moving block (9) is slidably connected inside the square box (8). A handle (10) is fixed to one side of the moving block (9). The other side of the moving block (9) is a rubber surface (11). An air outlet pipe (12) is connected to one side of the screening box (1).

4. The maize seed breeding and screening device according to claim 2, characterized in that: A wind direction adjusting mechanism (13) is provided between the screening box (1) and the vertical rod (51). The wind direction adjusting mechanism (13) is used to adjust the wind direction of the air ejected from the air nozzles (7). The wind direction adjusting mechanism (13) includes a square box (131) fixed to the top of the screening box (1). A roller (132) is rotatably connected between the inner walls of the square box (131). A wave groove (133) is formed on the surface of the 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 interior of the square box (1), and convex columns (135) are fixed to the opposite sides of the inner wall of the U-shaped frame (134).

5. The maize seed breeding and screening device according to claim 4, characterized in that: The opposite ends of the two protrusions (135) extend to the inside of the wave groove (133), and the protrusions (135) slide inside the wave groove (133). The bottom of the U-shaped frame (134) extends to the inside of the screening box (1). A rack (136) is fixed to 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 windshield (138) is fixed to the rotating rod (137). A driving gear (139) is fixed to the rotating rod (137). The driving gear (139) is meshed with the rack (136). A pulley (1310) is fixed to the transmission shaft of the vertical rod (51) and the roller (132). The two pulleys (1310) are connected by a belt (1311).

6. The screening device for selecting and breeding corn seeds according to claim 1, wherein: The screening box (1) is also provided with a spreading unit (14) for evenly spreading the corn seeds after quantitative feeding on the screen (2). The spreading unit (14) comprises an L-shaped platform (141) fixed to one side of the inner wall of the screening box (1), two fixed seats (142) are fixed to one side of the L-shaped platform (141), a cross bar (143) is fixed between the opposite sides of the two fixed seats (142), a sliding seat (144) is slidably connected to the cross bar (143), a vertical rod (145) is fixed to the bottom of the sliding seat (144), a sliding block (146) is slidably connected to the vertical rod (145), a pushing plate (147) is fixed to one side of the sliding block (146), a motor 2 (148) is fixed to one side of the screening box (1), and a block (149) is fixed to the output end of the motor 2 (148).

7. The maize seed breeding and screening device according to claim 6, characterized in that: The inner surface of the block (149) is slidably connected to a slide rod (1410), one end of which is fixed with an L-shaped block (1411), one side of which is rotatably connected to one side of a slider (146), and the outer surface of the slide rod (1410) is sleeved with a spring 1 (1412), one end of which is fixed to one side of the L-shaped block (1411), and the other end of which is fixed to one side of the block (149).

8. The screening device for corn seed breeding according to claim 1, characterized in that: Four bottom plates (15) are fixed on the inner wall of the screening box (1). Between the tops of the four bottom plates (15) and the bottom of the screen (2), second springs (16) are fixed. Between the inner walls of the screening box (1), two driving rods (17) are rotatably connected. On both of the two driving rods (17), cams (18) are fixed. The outer surface of the cam (18) contacts and presses against the bottom of the screen (2). One end of each of the two driving rods (17) penetrates through the screening box (1) and extends to the outside of the screening box (1). On one end of each of the two driving rods (17), a second pulley (19) is fixed. Between the two second pulleys (19), they are drivingly connected by a second belt (20). On one side of the screening box (1), a mounting plate (21) is fixed. On the top of the mounting plate (21), a third motor (22) is fixed. The third motor (22) drives one of the driving rods (17) to rotate. On one side of the screening box (1), a material receiving box (23) is slidably connected.

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