Ramie seed selecting and screening device

Abstract

The invention discloses a ramie seed selecting 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 ramie 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 ramie seed fine selecting and screening device, through the arrangement of the quantitative feeding mechanism, quantitative discharging of ramie seeds is achieved, the situation that too much ramie 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 seeds, broken seeds, fine grass seeds, dust and other impurities in the ramie seeds at the maximum efficiency; the seed breeding quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of seed treatment equipment, and particularly to a ramie seed selection and screening device. Background Art

[0002] During the processing and storage of ramie seeds, the selection and screening work before warehousing is particularly crucial, which directly affects the quality and efficiency of subsequent ramie planting. Ramie seeds are small in size and light in weight, and are often mixed with various impurities during the harvesting process, posing extremely high requirements for their selection.

[0003] When traditional seed selection and screening equipment is used to process ramie seeds, there are many significant problems:

[0004] (1) When faced with a large number of ramie seeds pouring in at one time, the existing equipment is difficult to handle. Ramie seeds are tiny, and during centralized transportation, they are prone to accumulation. For example, when screening ramie seeds after large-scale harvesting, a large number of seeds accumulate on the sieve mesh in a short time, resulting in some shriveled grains, broken grains, as well as fine grass seeds and dust mixed in, which cannot be screened out in a timely and efficient manner. If these impurities enter the warehouse along with the seeds, it will not only affect the storage life of the seeds, but also may reduce the germination rate of the seeds due to the interference of impurities during subsequent sowing, affecting the ramie planting effect.

[0005] (2) When ramie seeds are harvested, they are often accompanied by impurities such as broken leaves and stem debris. During the operation of the equipment, these fine impurities are prone to flying, difficult to quickly settle and be screened out. This will not only cause serious pollution to the working environment and affect the health of operators, but also may cause failures of the transmission components and electrical components of the equipment due to dust erosion, increasing the maintenance frequency and maintenance cost of the equipment, and shortening the overall service life of the equipment;

[0006] Therefore, we propose a ramie seed selection and screening device to solve the above problems. Summary of the Invention

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

[0008] To achieve the above objectives, the present invention is realized through the following technical solutions: A ramie seed selection and screening device includes a screening box, a sieve mesh 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 ramie 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 screening box, 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 ramie 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 rod is fixed to the bottom of the sliding seat, a slider is slidably connected to the vertical rod, a push plate is fixed to one side of the slider, 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] The present invention provides a ramie seed selection and screening device. Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) By setting up a quantitative feeding mechanism, quantitative feeding of ramie seeds is achieved, avoiding excessive feeding of ramie seeds at one time, causing screen overload, and preventing seeds from accumulating on the screen. The screen can screen out impurities such as shriveled seeds, broken seeds, small grass seeds, dust, etc. in ramie seeds with maximum efficiency, thereby improving the seed screening quality.

[0019] (2) Through the coordinated use of the air nozzle and the rubber surface, during the quantitative feeding process of ramie seeds, the air nozzle blows out air to select the seeds, and blows impurities such as small grass seeds, broken leaves, stem debris, dust, etc. in the ramie seeds onto the rubber surface for adhesion, thereby avoiding impurities 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 impurities can be evenly blown onto the rubber surface for adhesion, so that the fine impurities in the ramie seeds can be screened out more fully, thereby reducing the screening time.

[0020] (3) Through the setting of the tiling unit, after the ramie seeds are fed onto the left side of the top of the sieve mesh by the metering feeding mechanism, the ramie seeds on the sieve mesh are pushed and tiled cyclically to the right by the counterclockwise rectangular trajectory movement of the pushing plate, further improving the screening efficiency and enhancing the screening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the three-dimensional external structure of the present invention Figure 1 ;

[0022] Figure 2 is the three-dimensional external structure of the present invention Figure 2 ;

[0023] Figure 3 is the three-dimensional internal structure diagram of the screening box of the present invention;

[0024] Figure 4 is the linkage state diagram of the metering feeding mechanism and the wind direction adjusting mechanism of the present invention;

[0025] Figure 5 is the bottom view of the metering feeding mechanism of the present invention;

[0026] Figure 6 is the three-dimensional diagram of the wind direction adjusting mechanism of the present invention;

[0027] Figure 7 is the three-dimensional diagram of the tiling unit of the present invention;

[0028] Figure 8 is the three-dimensional diagram of the partial structure of the present invention.

[0029] In the figure: 1, screening box; 2, sieve 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, air 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 baffle; 139, driving gear; 1310, first pulley; 1311, first belt; 141, L-shaped platform; 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. Specific embodiments

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] The embodiments of the present invention provide three technical solutions, specifically including the following embodiments:

[0032] Embodiment 1

[0033] Please refer to Figure 1 - Figure 5 , a ramie seed selection and screening device, including a screening box 1. A box door is provided on one side of the screening box 1. The setting of the box door can open the box door to take out the qualified seeds after the ramie seeds are screened. The box door is not shown in the figure. A sieve mesh 2 is arranged inside the screening box 1. When the sieve mesh 2 vibrates, impurities such as shriveled grains, broken grains, straw debris, and dust in the ramie seeds can be screened down, and the qualified plump large seeds remain on the sieve mesh 2. A hopper 3 is connected to the top of the screening box 1. The ramie 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 ramie 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 ramie 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 on the inner wall of the screening box 1, and a limiting ring 45 is fixed on 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. Pipe covers 47 are rotatably connected to the bottoms of the two discharge pipes 43 through pins. When the spherical ball 49 rotates to the inclined surface 46, the pipe cover 47 automatically opens under the influence of gravity, and the ramie seeds in the discharge pipe 43 fall. A connecting rod 48 is fixed on the pin, and a spherical ball 49 is fixed at 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 component 5 for driving the circular plate 41 to rotate intermittently by 180 degrees is arranged on the top of the screening box 1.

[0035] The driving component 5 includes a vertical rod 51 rotatably connected to the top of the screening box 1. A semi-gear 52 is fixed on the vertical rod 51. An L-shaped seat 53 is fixed on the top of the screening box. A first motor 54 is fixed on 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 semi-gear 52. When the first motor 54 drives the semi-gear 52 to rotate one circle, the semi-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 ramie seeds is realized, avoiding excessive one-time feeding of ramie 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 screen out impurities such as shriveled grains, broken grains, fine grass seeds, and dust in ramie seeds with the highest efficiency, improving the quality of seed selection.

[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 ramie 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 ramie 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

[0039] 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.

[0040] 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.

[0041] Through the combined use of the air nozzle 7 and the rubber surface 11, during the process of quantitatively feeding ramie seeds, the air nozzle 7 blows air to perform air separation on the seeds, blowing impurities such as fine grass seeds, broken leaves, stem debris, and dust in the seeds onto the rubber surface 11 for adhesion. This avoids the flying of impurities during screening and improves the screening efficiency. Through the setting of the wind direction adjustment mechanism 13, during the process of quantitative feeding, the blowing angle can be adjusted and changed in a timely manner, enabling the impurities to be evenly blown onto the rubber surface 11 for adhesion, making the fine impurities in the seeds be screened out more thoroughly and reducing the screening time.

[0042] Example 3

[0043] Based on Example 2, as shown in Figures 7-8 In the figure, a spreading unit 14 for evenly spreading the ramie seeds after quantitative feeding on the screen 2 is further provided on the screening box 1. The spreading 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 source. 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.

[0044] 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.

[0045] Through the setting of the spreading unit 14, after the seeds are fed onto the left side of the top of the screen 2 by the quantitative feeding mechanism 4, by using the counterclockwise rectangular trajectory movement of the pushing plate 147, the ramie seeds on the screen 2 are cyclically pushed and spread to the right, further improving the screening efficiency and enhancing the screening effect.

[0046] 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 ramie 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 penetrates 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.

[0047] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0048] During operation, ramie seeds are poured into the hopper 3. Then, some seeds enter the discharge pipe 43 through the through hole 42 and are temporarily stored. The first motor 54 is started. 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, thereby driving the circular plate 41 to rotate 180 degrees, and then driving the discharge pipe 43 containing ramie 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 is opened 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. 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 synchronously driven to rotate. 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. The air nozzle 7 is started to make the air nozzle 7 spray air to perform air separation on the ramie seeds falling during discharging, blowing away impurities such as small grass seeds and dust in the ramie seeds and adhering them to the rubber surface 11. When the wind shield 138 rotates, the blowing angle can be adjusted to evenly blow the impurities onto the rubber surface 11. After the ramie seeds fall on the left side of the top of the sieve mesh 2, the second motor 148 is started. The second motor 148 drives the square block 149 to rotate, thereby driving the slider 146 to slide up and down on the vertical rod 145, and then making the square block 149 slide on the slide rod 1410 and compress the first compression spring 1412, thereby driving the slide seat 144 to slide left and right along the cross bar 143, and finally driving the pushing plate 147 to perform a counterclockwise rectangular trajectory movement to cyclically push the ramie seeds to the right and spread them out flat. The third motor 22 is started to make the third motor 22 drive the cam 18 to rotate, thereby driving the sieve mesh 2 to vibrate up and down, and then screening the ramie seeds to screen out the shriveled grains and broken grains and let them fall into the receiving box 23 for collection. Just open the box door on the screening box 1 to take out the qualified ramie seeds.

[0049] The above has described the embodiments of the invention in detail, but the content described is only the preferred embodiment of the present invention and cannot be considered as used to limit 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 ramie seed selection 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 ramie 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 opened through the top of the circular plate (41). At the bottom of the two through holes (42), a discharge pipe (43) is connected. 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 on the inner wall of the screening box (1). A limiting ring (45) is fixed on the L-shaped plate (44). An inclined surface (46) is opened 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 pipe covers (47) through pins, and a connecting rod (48) is fixed on the pin. One end of the connecting rod (48) is fixed with 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 perform a 180-degree intermittent rotation is arranged on the top of the screening box (1).

2. The ramie seed selection and screening device 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 on the vertical rod (51). An L-shaped seat (53) is fixed on the top of the screening box (1). A first motor (54) is fixed on 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 on the top of the circular plate (41) through a transmission shaft. The full gear (55) is engaged with the semi-gear (52).

3. The ramie seed selection and screening device according to claim 1, characterized in that: A horizontal 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 horizontal plate (6). A square box (8) is fixed on one side of the screening box (1). A moving block (9) is slidably connected inside the square box (8). A handle (10) is fixed on 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 ramie seed selection 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 to adjust the wind direction of the wind ejected from the air nozzles (7). The wind direction adjusting mechanism (13) includes a square box (131) fixed on 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 opened 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 on the opposite sides of the inner wall of the U-shaped frame (134).

5. The ramie seed selection and screening device according to claim 4, characterized in that: The opposite ends of the two bosses (135) extend into the interior of the wave groove (133), and the bosses (135) slide in the interior of the wave groove (133). The bottom of the U-shaped frame (134) extends into 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 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 to each other through a belt (1311).

6. The ramie seed selection and screening device according to claim 1, wherein: The screening box (1) is also provided with a spreading unit (14) for evenly spreading the quantitatively fed ramie seeds 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 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 second motor (148) is fixed to one side of the screening box (1). A block (149) is fixed to the output end of the second motor (148).

7. The ramie seed selection 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 the slide 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 slider (146), and the outer surface of the slide rod (1410) is sleeved with a spring 1 (1412), one end of the spring 1 (1412) is fixed to one side of the L-shaped block (1411), and the other end of the spring 1 (1412) is fixed to one side of the block (149).

8. The ramie seed selection and screening device according to claim 1, characterized in that: Four bottom plates (15) are fixed on the inner wall of the screening box (1). Between the top of each of the four bottom plates (15) and the bottom of the screen (2), a second spring (16) is fixed. Two driving rods (17) are rotatably connected between the inner walls of the screening box (1). Cam (18) is fixed on each of the two driving rods (17). 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). A second pulley (19) is fixed to one end of each of the two driving rods (17). The two second pulleys (19) are connected by a second belt (20). A mounting plate (21) is fixed to one side of the screening box (1). A third motor (22) is fixed to the top of the mounting plate (21). The third motor (22) drives one of the driving rods (17) to rotate. A receiving box (23) is slidably connected to one side of the screening box (1).

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