A rice seed screening device and method for rice planting

Abstract

The invention discloses a rice seed screening device and method for rice planting, relates to the technical field of screening equipment, and aims to solve the technical problems that the current rice seed screening device is difficult to efficiently screen out tiny impurities and shriveled rice seeds in rice seeds, and cannot accurately control the rice seed falling amount, wind speed and wind pressure matching degree of air selection. The invention comprises a support frame, a rice seed distribution trough, a plurality of airflow air selection mechanisms, a feeding component, and a feeding hopper. A support frame is constructed in the middle part of the support frame, and an eccentric screening mechanism for multi-stage eccentric screening of rice seeds is installed between the top of the support frame and the top of the support frame. The rice seed distribution trough is fixedly arranged at the top of the support frame. The invention controls the falling amount and falling state of rice seeds, adopts variable speed airflow combined with height difference to screen out impurities and shriveled rice seeds in a quantitative rice seed flow, and controls the rice seed falling amount and the wind speed and wind pressure matching degree of air selection separately, thereby greatly improving the efficient screening out of tiny impurities and shriveled rice seeds in rice seeds.

Description

Technical Field

[0001] The present invention relates to the technical field of screening equipment, and more specifically, to a rice seed screening device and method for rice planting. Background Art

[0002] In order to ensure the quality of rice during rice planting, rice seeds need to be screened. During screening, the rice seeds need to be screened through a set screening mesh plate to screen out high-quality rice seeds with uniform size and fullness, thereby meeting their sowing needs.

[0003] However, the rice seed screening device for rice planting in the prior art is usually vibrated in actual use. When vibrating, tiny impurities such as dust contained in the impurities are easily blown up and easily adhere to the surface of the rice seeds during the screening process, resulting in a decrease in the screening effect.

[0004] In response to the above problems, there is also a method of screening impurities in rice seeds by air separation. However, during the sorting and screening process, it is difficult to efficiently screen out tiny impurities and shriveled rice seeds in the rice seeds due to the inability to accurately control the amount of rice seeds falling, the matching degree of air separation wind speed and wind pressure, which makes the rice seed screening operation have many limitations. In view of this, we propose a rice seed screening device and method for rice planting. Summary of the invention

[0005] The purpose of the present invention is to provide a rice seed screening device and method for rice planting, so as to solve the technical problems that the current rice seed screening device is difficult to efficiently screen out tiny impurities and shriveled rice seeds in the rice seeds, and cannot accurately control the amount of rice seeds falling, the wind speed of the wind selection, and the matching degree of the wind pressure.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a rice seed screening device for rice planting, comprising a support frame, a rice seed distribution trough, a plurality of air flow air selection mechanisms, a feeding assembly, and a lower hopper;

[0007] A support frame is constructed in the middle of the support frame, and an eccentric screening mechanism for multi-stage eccentric screening of rice seeds is installed between the top of the support frame and the top of the support frame;

[0008] The rice seed distribution trough is fixedly arranged at the top of the support frame, and a diversion cavity for collecting the rice seeds screened out by the eccentric screening mechanism is opened at the top of the rice seed distribution trough;

[0009] A plurality of airflow air separation mechanisms are arranged in a circular array at the bottom end of the rice seed distribution trough for secondary air separation of impurities and shriveled rice seeds in the rice seeds;

[0010] The loading assembly is fixedly arranged on the top of the supporting frame;

[0011] The lower hopper is fixedly arranged in the support frame and is located below a plurality of the airflow air selection mechanisms;

[0012] The airflow selection mechanism comprises an S-shaped guide pipe, a rice seed passing mechanism for evenly distributing a quantitative rice seed flow in a flat shape falling is installed at the lower end of the S-shaped guide pipe, and an impurity passing mechanism for absorbing impurities and shriveled rice seeds in the quantitative rice seed flow is installed at the upper end of the S-shaped guide pipe, and impurities and shriveled rice seeds in the quantitative rice seed flow are screened out by variable speed airflow combined with height difference.

[0013] The present invention arranges a rice seed distribution trough and three airflow air selection mechanisms. The rice seeds screened by the eccentric screening mechanism fall into the diversion cavity and flow into the three airflow air selection mechanisms respectively. The falling amount and falling state of the rice seeds are controlled by the rice seed passing mechanism. The wind speed and wind pressure acting on tiny impurities and shriveled rice seeds are controlled by the impurity passing mechanism in cooperation with the S-shaped guide to achieve screening of tiny impurities and shriveled rice seeds in the rice seeds. Variable-speed airflow is used in combination with height difference to screen out impurities and shriveled rice seeds in a quantitative rice seed flow. The airflow wind speed and wind pressure are combined with the height difference to achieve screening of rice seeds. The falling amount of rice seeds and the matching degree of the wind speed and wind pressure of air selection are controlled separately, thereby greatly improving the efficient screening of tiny impurities and shriveled rice seeds in the rice seeds.

[0014] Preferably, the eccentric screening mechanism includes an electric motor, which is fixedly arranged at the center of the bottom end of the support frame, and the motor shaft of the electric motor passes through one end of the support frame and is fixedly installed with an arc-shaped transmission handle, and the other end of the arc-shaped transmission handle is rotatably installed with a yaw mechanism, and a ball groove for rotatably connecting the yaw mechanism is opened at the center of the top end of the support frame.

[0015] Preferably, the deflection mechanism comprises a large impurity screening frame, a medium impurity screening frame and a small impurity screening frame, which are stacked and fixed from top to bottom, and the outer edge surfaces of the large impurity screening frame, the medium impurity screening frame and the small impurity screening frame are connected with circular arc-shaped feed openings, the large impurity screening frame and the medium impurity screening frame are provided with uniformly distributed screening holes at the bottom, and the small impurity screening frame is provided with annular screening holes at the outer periphery of the bottom end.

[0016] Preferably, a mounting frame is constructed at the top of the large impurity screening frame, and a ball shaft is constructed at the center of the top of the mounting frame, and the ball shaft is rotatably disposed in the ball groove, and a shaft rod is constructed at the center of the bottom end of the small impurity screening frame, and the shaft rod is rotatably disposed in the arc-shaped transmission handle.

[0017] Preferably, the rice seed passing mechanism comprises a rectangular evenly distributed tube, a guide groove is constructed at the top of the rectangular evenly distributed tube, and the guide groove is connected to the diversion chamber, a flow outlet connected to the low end of the S-shaped guide tube is constructed on the side of the rectangular evenly distributed tube facing the impurity passing mechanism, and a plurality of air inlets corresponding to the flow outlet are equidistantly opened on the other side of the rectangular evenly distributed tube, and a quantitative mechanism for quantitatively measuring the rice seeds below is installed on the top of the rectangular evenly distributed tube.

[0018] Preferably, the quantitative mechanism includes a servo motor, which is fixedly mounted on the top of one side of the S-shaped guide tube, and the motor shaft of the servo motor extends to one end of the rectangular uniformly distributed tube and is equipped with a transmission shaft, the transmission shaft is rotatably arranged between the tops on both sides of the rectangular uniformly distributed tube, and a quantitative roller is fixedly mounted on the outer edge surface of the transmission shaft, and a plurality of quantitative output grooves are provided in a circular array on the outer edge surface of the quantitative roller.

[0019] Preferably, the impurity passing mechanism includes an impurity storage pipe, and the impurity storage pipe is configured with an inlet connected to the high end of the S-shaped guide pipe on the side facing the rice seed passing mechanism, and an exhaust fan is fixedly provided on one side of the outer edge surface of the impurity storage pipe, and an air guide mechanism and an electric butterfly valve are respectively installed at the top and bottom ends of the impurity storage pipe, and the air guide mechanism is connected to the exhaust fan.

[0020] Preferably, the air guide mechanism includes a cover plate, which is detachably mounted on the top of the debris storage pipe, and exhaust pipes connected to the exhaust fan are installed on both sides of the top of the cover plate, and arc-shaped extension plates extending into the debris storage pipe are constructed on both sides of the bottom end of the cover plate, and the bottom ends of the two arc-shaped extension plates are jointly constructed with an inclined screening plate, and the lower end of the inclined screening plate is away from the inlet.

[0021] Preferably, the feeding assembly includes a feeding hopper, the bottom end of which is symmetrically constructed with two supporting legs fixedly connected to a supporting frame, and an extension rod is fixedly installed on one side of the feeding hopper, and a monitoring camera for monitoring the downstream flow of rice seeds is fixedly installed on one end of the extension rod.

[0022] A rice seed screening method comprises the following steps:

[0023] S1: rice seed placement;

[0024] The rice seeds mixed with impurities are uniformly conveyed by several conveyors to the feeding assembly, and the rice seeds are guided to the eccentric screening mechanism through the feeding assembly for multi-stage eccentric screening;

[0025] S2: multi-stage eccentric screening;

[0026] The arc-shaped transmission handle is driven to rotate by the motor, thereby driving the large impurity screening frame, the medium impurity screening frame and the small impurity screening frame to rotate eccentrically clockwise around the motor with the ball shaft as the axis with the help of the shaft rod;

[0027] When the rice seeds fall into the large impurity screening frame, the large impurity screening frame is in a clockwise eccentric rotation state, causing the rice seeds to be concentrated on one side of the large impurity screening frame and to make a circular motion, and the large impurities in the rice seeds are screened out through the evenly distributed screening holes arranged on the large impurity screening frame, and the rice seeds fall into the medium impurity screening frame through the evenly distributed screening holes;

[0028] When the rice seeds fall into the medium impurity screening frame, the medium impurity screening frame is in a clockwise eccentric rotation state, causing the rice seeds to be concentrated on one side of the medium impurity screening frame and to make a circular motion, and the medium impurities in the rice seeds are screened out through the evenly distributed screening holes arranged on the medium impurity screening frame, and the rice seeds fall into the small impurity screening frame through the evenly distributed screening holes;

[0029] When the rice seeds fall into the small impurity screening frame, the small impurity screening frame is in a clockwise eccentric rotation state, causing the rice seeds to be concentrated on one side of the small impurity screening frame and to make a circular motion, and the small impurities in the rice seeds are screened out through the ring cloth screening holes arranged on the small impurity screening frame, and the rice seeds fall into the diversion cavity through the ring cloth screening holes;

[0030] After completing the multi-stage eccentric screening for rice seeds, the arc-shaped transmission handle is driven by the motor to rotate, thereby driving the large impurity screening frame, the medium impurity screening frame, and the small impurity screening frame to rotate eccentrically counterclockwise around the motor with the ball shaft as the axis with the help of the shaft rod, so that the large, medium, and small impurities accumulated in the large impurity screening frame, the medium impurity screening frame, and the small impurity screening frame are discharged through three circular arc-shaped discharge ports for subsequent screening;

[0031] S3: Rice seed winnowing;

[0032] The rice seeds are divided through the diversion chamber to flow into three airflow air selection mechanisms respectively, and the rice seeds are air-selected by the airflow air selection mechanisms to remove impurities and shriveled rice seeds;

[0033] S301: Quantitative placement of rice seeds;

[0034] The rice seeds are distributed to the guide groove by a plurality of flow distribution chambers, and the transmission shaft is driven to rotate by a servo motor, thereby driving the quantitative roller to rotate at a uniform speed in the rectangular uniform distribution tube, and the rice seeds accumulated in the guide groove are quantitatively extracted through a plurality of quantitative output grooves on the quantitative roller into the rectangular uniform distribution tube, so that the rice seeds are evenly distributed in the rectangular uniform distribution tube and fall down;

[0035] S301a: Amount of rice seeds put into a single quantitative output trough:

[0036] ;

[0037] in, The rice seed storage capacity of a single quantitative output tank. is the length of the quantitative output slot, is the depth of the quantitative output groove, is the rice seed particle size, is the shape and stacking coefficient of rice seeds, is the filling rate;

[0038] S301b: Total amount of rice seeds released within the specified time:

[0039] ;

[0040] in, is the number of quantitative output slots, For in time Speed The number of revolutions of the inner metering roller;

[0041] S302: Rice seeds are evenly distributed;

[0042] The rice seeds quantitatively fed into the rectangular uniform distribution tube slide out in the quantitative output trough and fall down in a flat shape in the rectangular uniform distribution tube, thereby achieving uniform distribution in the rectangular uniform distribution tube;

[0043] S303: impurity absorption;

[0044] Through the exhaust fan and the cover plate with two exhaust pipes, the external air is sucked into the rectangular uniformly distributed pipe through several air inlets, and enters the impurity storage pipe through the outflow port, the S-shaped guide pipe and the inflow port in sequence. The airflow passing through the flat falling rice seed flow guides the tiny impurities and shriveled rice seeds contained in the rice seeds and makes them enter the impurity storage pipe, completing the screening of the rice seeds that meet the standards;

[0045] S303a: Minimum wind speed required to suck up tiny impurities and shrunken rice seeds:

[0046] ;

[0047] in, The minimum wind speed required to suck up tiny impurities and shrunken rice seeds. For the density of tiny impurities and shriveled rice seeds, is the average particle size of tiny impurities and shriveled rice seeds. is the air pressure, is the air constant, is the absolute temperature of the air, is the acceleration due to gravity, is the viscosity of air, is the surface roughness coefficient of tiny impurities and shriveled rice seeds, The particle shape factor is used to correct the calculation of particle radius to more accurately reflect the effect of actual particle shape on movement, as tiny impurities and shriveled rice seeds are not perfect spheres.

[0048] S303b: actual wind speed of the exhaust fan;

[0049] In order to ensure that tiny impurities and shriveled rice seeds can be sucked up, the wind speed generated by the exhaust fan should be greater than or equal to the minimum speed required to suck up the impurities, that is, , so the wind speed algorithm formula is:

[0050] ;

[0051] in, To achieve the required wind speed for the exhaust fan to remove dust and shrunken rice seeds. is the speed of the exhaust fan, is the blade shape coefficient of the exhaust fan, is the proportionality coefficient, which is used to establish the initial proportional relationship between the exhaust fan speed and the wind speed. The turbulence coefficient takes into account the effect of the turbulence of air flow on wind speed. Turbulence will make the wind speed distribution uneven. This coefficient is used to modify the wind speed formula to reflect the effect of turbulence.

[0052] S303c: Effect of pipes on wind pressure;

[0053] The wind flowing in the vertically arranged rectangular uniformly distributed pipes and storage pipes and the inclined S-shaped guide pipes will be affected by the pipe resistance, so the total pipe resistance is:

[0054] ;

[0055] in, is the resistance function of the pipeline, is the length of the rectangular uniformly distributed tube, , are the diameters of the storage pipe and the S-shaped flow guide pipe, is the inclination angle of the S-shaped flow guide tube, is the friction coefficient of the pipe, is the total length of the pipeline, is the local drag coefficient, is the air density under standard conditions, is the humidity coefficient, is the relative humidity, To achieve the required wind speed for the exhaust fan to remove dust and shrunken rice seeds. is the wind speed correction factor;

[0056] S303d: actual wind pressure;

[0057] The actual wind pressure acting on rice seeds, tiny impurities, and shriveled rice seeds is:

[0058] ; S4: discharge of rice seeds, tiny impurities, and shriveled rice seeds;

[0059] The rice seeds after air selection directly fall into the lower hopper (7) through the rectangular uniformly distributed pipe (801), and the tiny impurities and shrunken rice seeds selected by air are stopped and the electric butterfly valve (904) is opened when the eccentric screening mechanism (3) rotates counterclockwise eccentrically, so that the tiny impurities and shrunken rice seeds guided to one side of the impurity storage pipe (901) through the inclined screening plate (1004) are discharged through the impurity storage pipe (901), thereby achieving the screening operation of rice seeds for rice planting.

[0060] Compared with the prior art, the present invention has the following beneficial effects:

[0061] 1. The present invention arranges a rice seed distribution trough and three airflow air selection mechanisms. The rice seeds screened by the eccentric screening mechanism fall into the diversion cavity and flow into the three airflow air selection mechanisms respectively. The falling amount and falling state of the rice seeds are controlled by the rice seed passing mechanism. The wind speed and wind pressure acting on tiny impurities and shriveled rice seeds are controlled by the impurity passing mechanism in cooperation with the S-shaped guide to achieve screening of tiny impurities and shriveled rice seeds in the rice seeds. The variable speed airflow is combined with the height difference to screen out impurities and shriveled rice seeds in a quantitative rice seed flow. The airflow wind speed and wind pressure are combined with the height difference to achieve screening of rice seeds. The falling amount of rice seeds and the matching degree of the wind speed and wind pressure of the air selection are controlled separately, thereby greatly improving the efficient screening of tiny impurities and shriveled rice seeds in the rice seeds.

[0062] 2. The present invention controls the quantitative placement and falling shape of rice seeds through the rice seed passing mechanism, so that the rice seed flow passes through the rectangular uniformly distributed pipe in a flat shape and in a quantitative manner. Combined with air selection, the efficient screening of tiny impurities and shriveled rice seeds contained in the rice seeds is improved.

[0063] 3. The present invention accurately controls the wind speed and wind pressure in the S-shaped guide tube, the rectangular uniformly distributed tube and the impurity storage tube, and measures the actual wind speed required to suck up tiny impurities and shriveled rice seeds, thereby accurately screening out a screening scheme suitable for rice seeds of specified specifications, and combines the comparison between the minimum wind speed and the actual wind speed, as well as the influence between the pipeline resistance and the actual wind pressure, to ensure that tiny impurities and shriveled rice seeds contained in the rice seeds are efficiently screened out, further improving the efficient screening of tiny impurities and shriveled rice seeds contained in the rice seeds.

[0064] 4. The present invention realizes multi-stage eccentric screening of rice seeds through an eccentric screening mechanism. During the screening process, the arc-shaped transmission handle is driven by the motor to rotate, thereby driving the large impurity screening frame, the medium impurity screening frame and the small impurity screening frame to rotate eccentrically clockwise around the motor with the help of the shaft rod, with the ball shaft as the axis, so that the multi-stage screening of rice seeds is completed through the large impurity screening frame, the medium impurity screening frame and the small impurity screening frame. During the multi-stage screening process, since the large impurity screening frame and the medium impurity screening frame are close to the ball shaft, their eccentric rotation amplitude is small, while the small impurity screening frame is far away from the ball shaft and has a large deflection rotation amplitude. The ring cloth screening holes arranged in an annular manner are more conducive to screening rice seeds, and the arc-shaped transmission handle is driven by the motor to drive the large impurity screening frame, the medium impurity screening frame and the small impurity screening frame to rotate eccentrically counterclockwise around the motor with the help of the shaft rod, and the impurities are discharged through three circular arc discharge ports, thereby completing the staged screening of rice seeds, avoiding the accumulation of impurities and affecting the subsequent screening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0066] Figure 2 It is a schematic diagram of the structure of the present invention in an upward-looking state;

[0067] Figure 3 It is a front view of a part of the structure of the present invention;

[0068] Figure 4 It is a schematic diagram of the connection structure between the eccentric screening mechanism and the feeding assembly in the present invention;

[0069] Figure 5 It is a structural schematic diagram of the eccentric screening mechanism in the present invention in a split state;

[0070] Figure 6 This is a schematic diagram of the structure of the rice seed distribution tank in the present invention;

[0071] Figure 7 It is a structural schematic diagram of the airflow air selection mechanism in the present invention;

[0072] Figure 8 It is a schematic diagram of the structure of the rice seed passing mechanism in the present invention in a cross-sectional state;

[0073] Fig. 9 It is a schematic diagram of the structure of the impurity passing mechanism in the present invention in a cross-sectional state;

[0074] Fig.10 It is a structural schematic diagram of the air guide mechanism in the present invention.

[0075] Description of the numbers in the figure:

[0076] 1. Support frame; 2. Support frame; 3. Eccentric screening mechanism; 301. Motor; 302. Arc-shaped transmission handle; 303. Large impurity screening frame; 304. Medium impurity screening frame; 305. Small impurity screening frame; 306. Circumferential arc-shaped feeding port; 307. Uniform screening holes; 308. Ring-shaped screening holes; 309. Mounting frame; 310. Ball shaft; 311. Shaft;

[0077] 4. Rice seed distribution trough; 401. Diversion chamber;

[0078] 5. Airflow selection mechanism; 501. S-type guide pipe;

[0079] 6. Loading assembly; 601. Loading hopper; 602. Support legs; 603. Extension rod; 604. Monitoring camera;

[0080] 7. lower hopper; 8. rice seed passing mechanism; 801. rectangular uniform distribution tube; 802. flow guide groove; 803. outflow port; 804. air inlet; 805. servo motor; 806. transmission shaft; 807. quantitative roller; 808. quantitative output slot;

[0081] 9. Impurities passing mechanism; 901. Impurities storage pipe; 902. Inlet; 903. Exhaust fan; 904. Electric butterfly valve;

[0082] 10. Air guide mechanism; 1001. Cover plate; 1002. Exhaust duct; 1003. Arc-shaped extension plate; 1004. Inclined screening plate. DETAILED DESCRIPTION

[0083] like Figures 1 to 10 As shown, the present invention comprises a support frame 1, a rice seed distribution trough 4, a plurality of air flow selection mechanisms 5, a feeding assembly 6, and a lower hopper 7;

[0084] A support frame 2 is constructed in the middle part of the support frame 1, and an eccentric screening mechanism 3 for multi-stage eccentric screening of rice seeds is installed between the top of the support frame 1 and the top of the support frame 2. A rice seed distribution trough 4 is fixedly arranged at the top of the support frame 2, and a diversion chamber 401 for collecting rice seeds screened out by the eccentric screening mechanism 3 is opened at the top of the rice seed distribution trough 4. A plurality of airflow air selection mechanisms 5 are arranged in a circular array at the bottom end of the rice seed distribution trough 4 for secondary air selection of impurities and shriveled rice seeds in the rice seeds. A loading assembly 6 is fixedly arranged at the top of the support frame 1, and a lower hopper 7 is fixedly arranged in the support frame 1 below the plurality of airflow air selection mechanisms 5. The airflow air selection mechanism 5 includes an S-shaped guide tube 501, and a rice seed passing mechanism 8 for evenly distributing a quantitative rice seed flow in a flat shape is installed at the lower end of the S-shaped guide tube 501, and a rice seed passing mechanism 8 for absorbing the quantitative rice seed flow is installed at the upper end of the S-shaped guide tube 501. The impurities and shriveled rice seeds are screened out in a quantitative rice seed flow through an impurity passing mechanism 9 by a variable speed airflow combined with a height difference. The rice seeds screened by the eccentric screening mechanism 3 fall into the diversion cavity 401 through the arrangement of the rice seed distribution trough 4 and the three airflow air selection mechanisms 5, and flow into the three airflow air selection mechanisms 5 respectively. The falling amount and falling state of the rice seeds are controlled by the rice seed passing mechanism 8, and then the wind speed and wind pressure acting on the tiny impurities and shriveled rice seeds are controlled by the impurity passing mechanism 9 in cooperation with the S-shaped guide tube 501, so as to realize the screening of tiny impurities and shriveled rice seeds in the rice seeds. The impurities and shriveled rice seeds in the quantitative rice seed flow are screened out by a variable speed airflow combined with a height difference, and the screening of the rice seeds is realized by combining the airflow wind speed and wind pressure with the height difference. The efficient screening of the tiny impurities and shriveled rice seeds in the rice seeds is greatly improved by controlling the matching degree of the falling amount of the rice seeds with the wind speed and wind pressure of the air selection respectively.

[0085] In an embodiment of the present invention, the eccentric screening mechanism 3 includes a motor 301, which is fixedly arranged at the center of the bottom end of the support frame 2, and the motor shaft of the motor 301 passes through one end of the support frame 2 and is fixedly installed with an arc-shaped transmission handle 302, and the other end of the arc-shaped transmission handle 302 is rotatably installed with a yaw mechanism, and a ball groove for rotatably connecting the yaw mechanism is opened at the center of the top end of the support frame 1, and the yaw mechanism includes a large impurity screening frame 303, a medium impurity screening frame 304 and a small impurity screening frame 305, and the large impurity screening frame 303, the medium impurity screening frame 304 and the small impurity screening frame 305 are stacked and fixed from top to bottom , and the outer edge surfaces of the large impurity screening frame 303, the medium impurity screening frame 304, and the small impurity screening frame 305 are all connected with a circular arc-shaped feed opening 306, the large impurity screening frame 303 and the medium impurity screening frame 304 are both provided with uniformly distributed screening holes 307 at the bottom, and the small impurity screening frame 305 is provided with annular screening holes 308 at the outer periphery of the bottom end, the top of the large impurity screening frame 303 is configured with a mounting frame 309, and the center of the top of the mounting frame 309 is configured with a ball shaft 310, and the ball shaft 310 is rotatably arranged in the ball groove, and the center of the bottom end of the small impurity screening frame 305 is configured with a shaft rod 311, and the shaft rod 311 is rotatably arranged on the arc-shaped transmission In the movable handle 302, the eccentric screening mechanism 3 is used to realize multi-stage eccentric screening of rice seeds. During the screening process, the arc-shaped transmission handle 302 is driven to rotate by the motor 301, thereby driving the large impurity screening frame 303, the medium impurity screening frame 304, and the small impurity screening frame 305 to rotate eccentrically clockwise around the motor 301 with the help of the shaft 311, with the ball shaft 310 as the axis, so as to complete the multi-stage screening of rice seeds through the large impurity screening frame 303, the medium impurity screening frame 304, and the small impurity screening frame 305. During the multi-stage screening process, since the large impurity screening frame 303 and the medium impurity screening frame 304 are close to the ball shaft 310, Therefore, its eccentric rotation amplitude is small, and the small impurity screening frame 305 is far away from the ball shaft 310, and the deflection rotation amplitude is large. The annular ring cloth screening holes 308 arranged in an annular manner are more conducive to screening rice seeds, and the arc transmission handle 302 is driven by the motor 301 to drive the large impurity screening frame 303, the medium impurity screening frame 304, and the small impurity screening frame 305 to rotate eccentrically counterclockwise around the motor 301 with the help of the shaft 311 with the ball shaft 310 as the axis, and the impurities are discharged through the three circular arc discharge ports 306, thereby completing the staged screening of rice seeds and avoiding the accumulation of impurities and affecting the subsequent screening effect.

[0086] In the embodiment of the present invention, the rice seed passing mechanism 8 includes a rectangular uniformly distributed tube 801, the top of the rectangular uniformly distributed tube 801 is configured with a guide groove 802, and the guide groove 802 is connected to the diversion chamber 401, and the side of the rectangular uniformly distributed tube 801 facing the impurity passing mechanism 9 is configured with an outflow port 803 connected to the lower end of the S-shaped guide tube 501, and the other side of the rectangular uniformly distributed tube 801 is equidistantly provided with a plurality of air inlets 804 corresponding to the outflow port 803, and a quantitative mechanism for quantitatively distributing the rice seeds below is installed at the top of the rectangular uniformly distributed tube 801, and the quantitative mechanism includes a servo motor 805, and the servo motor 805 is fixedly arranged on the S-shaped guide tube. 501, and the motor shaft of the servo motor 805 extends to one end of the rectangular uniformly distributed tube 801 and is equipped with a transmission shaft 806, which is rotatably arranged between the tops on both sides of the rectangular uniformly distributed tube 801, and a metering roller 807 is fixedly installed on the outer edge surface of the transmission shaft 806, and a plurality of quantitative output grooves 808 are arranged in a ring array on the outer edge surface of the metering roller 807. The quantitative delivery and falling shape of the rice seeds are controlled by the rice seed passing mechanism 8, so that the rice seed flow passes through the rectangular uniformly distributed tube 801 in a flat and quantitative manner, and cooperates with air selection to improve the efficient screening of tiny impurities and shriveled rice seeds contained in the rice seeds.

[0087] In an embodiment of the present invention, the impurity passing mechanism 9 includes an impurity storage pipe 901, and the impurity storage pipe 901 is configured with an inlet 902 connected to the high end of the S-shaped guide pipe 501 on one side facing the rice seed passing mechanism 8, and an exhaust fan 903 is fixedly arranged on one side of the outer edge surface of the impurity storage pipe 901, and an air guide mechanism 10 and an electric butterfly valve 904 are respectively installed at the top and bottom ends of the impurity storage pipe 901, and the air guide mechanism 10 is connected to the exhaust fan 903. The exhaust fan 903 cooperates with a cover plate 1001 with two exhaust pipes 1002 to suck external air into the rectangular uniformly distributed pipe 801 through a plurality of air inlets 804, and enters the impurity storage pipe 901 through the outflow port 803, the S-shaped guide pipe 501, and the inflow port 902 in turn, and the airflow passing through the flat falling rice seed flow is used to drain the tiny impurities and shriveled rice seeds contained in the rice seeds, so that they enter the impurity storage pipe 901, and the screening of qualified rice seeds is completed.

[0088] In the embodiment of the present invention, the air guide mechanism 10 includes a cover plate 1001, which is detachably mounted on the top of the storage tube 901, and exhaust pipes 1002 connected to the exhaust fan 903 are installed on both sides of the top of the cover plate 1001, and arc-shaped extension plates 1003 extending into the storage tube 901 are constructed on both sides of the bottom end of the cover plate 1001, and the bottom ends of the two arc-shaped extension plates 1003 are jointly constructed with an inclined screening plate 1004, which is inclined. The lower end of the screening plate 1004 is away from the inlet 902, and the rice seeds after air selection directly fall into the lower hopper 7 through the rectangular uniformly distributed tube 801. When the tiny impurities and shriveled rice seeds selected by the air are in a counterclockwise eccentric rotation state at the eccentric screening mechanism 3, the exhaust fan 903 is stopped and the electric butterfly valve 904 is opened, so that the tiny impurities and shriveled rice seeds guided to one side of the impurity storage pipe 901 by the inclined screening plate 1004 are discharged through the impurity storage pipe 901.

[0089] In an embodiment of the present invention, the feeding assembly 6 includes a feeding hopper 601, the bottom end of which is symmetrically constructed with two supporting legs 602 fixedly connected to the supporting frame 1, and an extension rod 603 is fixedly installed on one side of the feeding hopper 601, and a monitoring camera 604 for monitoring the downstream situation of rice seeds is fixedly installed on one end of the extension rod 603. The rice seeds are guided into the large impurity screening frame 303 through the feeding hopper 601. During the feeding process, the falling situation of the rice seeds will be photographed by the monitoring camera 604 to facilitate the control of intermittent feeding.

[0090] As another embodiment of the present invention, a rice seed screening method comprises the following steps:

[0091] S1: rice seed placement;

[0092] The rice seeds mixed with impurities are uniformly conveyed by several conveyors to the feeding assembly 6, and are guided to the eccentric screening mechanism 3 by the feeding assembly 6 for multi-stage eccentric screening;

[0093] S2: multi-stage eccentric screening;

[0094] The arc-shaped transmission handle 302 is driven to rotate by the motor 301, thereby driving the large impurity screening frame 303, the medium impurity screening frame 304, and the small impurity screening frame 305 to rotate eccentrically clockwise around the motor 301 with the help of the shaft 311, with the ball shaft 310 as the axis;

[0095] When the rice seeds fall into the large impurity screening frame 303, the large impurity screening frame 303 is in a clockwise eccentric rotation state, causing the rice seeds to be concentrated on one side of the large impurity screening frame 303 and to make a circular motion, and the large impurities in the rice seeds are screened out through the evenly distributed screening holes 307 arranged on the large impurity screening frame 303, and the rice seeds fall into the medium impurity screening frame 304 through the evenly distributed screening holes 307;

[0096] When the rice seeds fall into the medium impurity screening frame 304, the medium impurity screening frame 304 is in a clockwise eccentric rotation state, causing the rice seeds to be concentrated on one side of the medium impurity screening frame 304 and to make a circular motion, and the medium impurities in the rice seeds are screened out through the uniformly distributed screening holes 307 arranged on the medium impurity screening frame 304, and the rice seeds fall into the small impurity screening frame 305 through the uniformly distributed screening holes 307;

[0097] When the rice seeds fall into the small impurity screening frame 305, the small impurity screening frame 305 is in a clockwise eccentric rotation state, causing the rice seeds to be concentrated on one side of the small impurity screening frame 305 and to make a circular motion, and the small impurities in the rice seeds are screened out through the ring cloth screening holes 308 arranged on the small impurity screening frame 305, and the rice seeds fall into the diversion cavity 401 through the ring cloth screening holes 308;

[0098] After completing the multi-stage eccentric screening for rice seeds, the arc-shaped transmission handle 302 is driven to rotate by the motor 301, thereby driving the large impurity screening frame 303, the medium impurity screening frame 304, and the small impurity screening frame 305 to rotate eccentrically counterclockwise around the motor 301 with the help of the shaft 311, with the ball shaft 310 as the axis, so that the large, medium, and small impurities accumulated in the large impurity screening frame 303, the medium impurity screening frame 304, and the small impurity screening frame 305 are discharged through three circumferential arc-shaped discharge ports 306 for subsequent screening;

[0099] S3: Rice seed winnowing;

[0100] The rice seeds are divided by the diversion chamber 401 and flow into the three airflow air separation mechanisms 5 respectively. The rice seeds are air-separated by the airflow air separation mechanisms 5 to remove impurities and shriveled rice seeds.

[0101] S301: Quantitative placement of rice seeds;

[0102] The rice seeds distributed to the guide groove 802 by the plurality of flow distribution chambers 401 are driven by the servo motor 805 to rotate the transmission shaft 806, thereby driving the quantitative roller 807 to rotate at a constant speed in the rectangular uniform distribution tube 801, and the rice seeds accumulated in the guide groove 802 are quantitatively extracted through the plurality of quantitative output grooves 808 on the quantitative roller 807 into the rectangular uniform distribution tube 801, so that the rice seeds are evenly distributed in the rectangular uniform distribution tube 801 and fall down;

[0103] S301a: Amount of rice seeds put into a single quantitative output trough 808:

[0104] ;

[0105] in, is the rice seed storage amount of a single quantitative output tank 808, is the length of the quantitative output slot 808, is the depth of the quantitative output groove 808, is the rice seed particle size, is the shape and stacking coefficient of rice seeds, is the filling rate;

[0106] S301b: Total amount of rice seeds released within the specified time:

[0107] ;

[0108] in, is the number of quantitative output slots 808, For in time Speed The number of revolutions of the inner metering roller 807;

[0109] S302: Rice seeds are evenly distributed;

[0110] The rice seeds quantitatively fed into the rectangular uniform distribution tube 801 slide out of the quantitative output slot 808 and fall flat in the rectangular uniform distribution tube 801 to achieve uniform distribution in the rectangular uniform distribution tube 801;

[0111] S303: impurity absorption;

[0112] The exhaust fan 903 cooperates with the cover plate 1001 with two exhaust pipes 1002 to suck the external air into the rectangular uniformly distributed pipe 801 through the plurality of air inlets 804, and enters the impurity storage pipe 901 through the outflow port 803, the S-shaped guide pipe 501, and the inflow port 902 in sequence, and the airflow passing through the flat falling rice seed flow guides the tiny impurities and shrunken rice seeds contained in the rice seeds into the impurity storage pipe 901, so as to complete the screening of the rice seeds that meet the standards;

[0113] S303a: Minimum wind speed required to suck up tiny impurities and shrunken rice seeds:

[0114] ;

[0115] in, The minimum wind speed required to suck up tiny impurities and shrunken rice seeds. For the density of tiny impurities and shriveled rice seeds, is the average particle size of tiny impurities and shriveled rice seeds. is the air pressure, is the air constant, is the absolute temperature of the air, is the acceleration due to gravity, is the viscosity of air, is the surface roughness coefficient of tiny impurities and shriveled rice seeds, The particle shape factor is used to correct the calculation of particle radius to more accurately reflect the effect of actual particle shape on movement, as tiny impurities and shriveled rice seeds are not perfect spheres.

[0116] S303b: actual wind speed of exhaust fan 903;

[0117] In order to ensure that tiny impurities and shrunken rice seeds can be sucked up, the wind speed generated by the exhaust fan 903 should be greater than or equal to the minimum speed required to suck up the impurities, that is, , so the wind speed algorithm formula is:

[0118] ;

[0119] in, The exhaust fan 903 realizes the wind speed required to remove dust and shriveled rice seeds in the rice seeds. is the rotation speed of the exhaust fan 903, is the blade shape coefficient of the exhaust fan 903, is a proportionality coefficient used to establish a preliminary proportional relationship between the rotation speed of the exhaust fan 903 and the wind speed. The turbulence coefficient takes into account the effect of the turbulence of air flow on wind speed. Turbulence will make the wind speed distribution uneven. This coefficient is used to modify the wind speed formula to reflect the effect of turbulence.

[0120] S303c: Effect of pipes on wind pressure;

[0121] The wind flowing in the vertically arranged rectangular uniformly distributed pipe 801 and the impurity storage pipe 901 and the inclinedly arranged S-shaped flow guide pipe 501 will be affected by the pipe resistance, and the total pipe resistance is:

[0122] ;

[0123] in, is the resistance function of the pipeline, is the length of the rectangular uniformly distributed tube 801, , are the diameters of the impurity storage pipe 901 and the S-shaped flow guide pipe 501, is the inclination angle of the S-shaped flow guide tube 501, is the friction coefficient of the pipe, is the total length of the pipeline, is the local drag coefficient, is the air density under standard conditions, is the humidity coefficient, is the relative humidity, The exhaust fan 903 realizes the wind speed required to remove dust and shriveled rice seeds in the rice seeds. is the wind speed correction factor;

[0124] S303d: actual wind pressure;

[0125] The actual wind pressure acting on rice seeds, tiny impurities, and shriveled rice seeds is:

[0126] ;

[0127] S4: discharge of rice seeds, tiny impurities and shriveled rice seeds;

[0128] The rice seeds after air selection directly fall into the lower hopper 7 through the rectangular uniformly distributed pipe 801, and the tiny impurities and shriveled rice seeds selected by the air are in a counterclockwise eccentric rotation state at the eccentric screening mechanism 3. The exhaust fan 903 is stopped and the electric butterfly valve 904 is opened, so that the tiny impurities and shriveled rice seeds guided to one side of the impurity storage pipe 901 through the inclined screening plate 1004 are discharged through the impurity storage pipe 901, thereby realizing the screening operation of rice seeds for rice planting.

[0129] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A screening method for a rice seed screening device for rice planting, characterized in that: The rice seed screening device for rice planting comprises: A support frame (1), wherein a support frame (2) is constructed in the middle of the support frame (1), and an eccentric screening mechanism (3) for multi-stage eccentric screening of rice seeds is installed between the top end of the support frame (1) and the top end of the support frame (2); A rice seed distribution trough (4), the rice seed distribution trough (4) being fixedly arranged at the top end of the support frame (2), and a diversion cavity (401) for collecting rice seeds screened out by the eccentric screening mechanism (3) is provided at the top end of the rice seed distribution trough (4); A plurality of airflow air selection mechanisms (5), wherein the plurality of airflow air selection mechanisms (5) are arranged in a ring array at the bottom end of the rice seed distribution trough (4) and are used for secondary air selection of impurities and shriveled rice seeds in the rice seeds; A loading assembly (6), the loading assembly (6) being fixedly arranged on the top of the supporting frame (1); A lower hopper (7), the lower hopper (7) being fixedly arranged in the support frame (1) and located below the plurality of airflow air selection mechanisms (5); The airflow air selection mechanism (5) comprises an S-shaped flow guide tube (501), a rice seed passing mechanism (8) for evenly distributing a quantitative rice seed flow in a flat shape and falling downward is installed at the lower end of the S-shaped flow guide tube (501), and an impurity passing mechanism (9) for absorbing impurities and shriveled rice seeds in the quantitative rice seed flow is installed at the upper end of the S-shaped flow guide tube (501), and impurities and shriveled rice seeds in the quantitative rice seed flow are screened out by a variable speed airflow combined with a height difference; The method comprises the following steps: S1: rice seed placement; The rice seeds mixed with impurities are uniformly conveyed by a plurality of conveyors to a feeding assembly (6), and the rice seeds are guided to an eccentric screening mechanism (3) through the feeding assembly (6) for multi-stage eccentric screening; S2: multi-stage eccentric screening; The arc-shaped transmission handle (302) is driven to rotate by the motor (301), thereby driving the large impurity screening frame (303), the medium impurity screening frame (304), and the small impurity screening frame (305) to rotate eccentrically clockwise around the motor (301) with the help of the shaft (311) with the ball shaft (310) as the axis; When the rice seeds fall into the large impurity screening frame (303), the large impurity screening frame (303) is in a clockwise eccentric rotation state, causing the rice seeds to be concentrated on one side of the large impurity screening frame (303) and to perform a circular motion, and the large impurities in the rice seeds are screened out through the evenly distributed screening holes (307) arranged on the large impurity screening frame (303), and the rice seeds are allowed to pass through the evenly distributed screening holes (307) and fall into the medium impurity screening frame (304); When the rice seeds fall into the medium impurity screening frame (304), the medium impurity screening frame (304) is in a clockwise eccentric rotation state, causing the rice seeds to be concentrated on one side of the medium impurity screening frame (304) and to perform a circular motion, so that medium impurities in the rice seeds are screened out through the evenly distributed screening holes (307) arranged on the medium impurity screening frame (304), and the rice seeds fall into the small impurity screening frame (305) through the evenly distributed screening holes (307); When the rice seeds fall into the small impurity screening frame (305), the small impurity screening frame (305) is in a clockwise eccentric rotation state, causing the rice seeds to be concentrated on one side of the small impurity screening frame (305) and to perform a circular motion, and the small impurities in the rice seeds are screened out through the ring cloth screening holes (308) arranged on the small impurity screening frame (305), and the rice seeds pass through the ring cloth screening holes (308) and fall into the diversion chamber (401); After the multi-stage eccentric screening of the rice seeds is completed, the arc-shaped transmission handle (302) is driven to rotate by the motor (301), thereby driving the large impurity screening frame (303), the medium impurity screening frame (304), and the small impurity screening frame (305) to rotate eccentrically counterclockwise around the motor (301) with the help of the shaft (311) with the ball shaft (310) as the axis, so that the large, medium, and small impurities accumulated in the large impurity screening frame (303), the medium impurity screening frame (304), and the small impurity screening frame (305) are discharged through three circular arc-shaped discharge ports (306) for subsequent screening; S3: Rice seed winnowing; The rice seeds are diverted through the diversion chamber (401) so that they flow into three airflow air separation mechanisms (5) respectively, and the rice seeds are air-separated by the airflow air separation mechanisms (5) to remove impurities and shriveled rice seeds therein; S301: Quantitative placement of rice seeds; The rice seeds distributed to the guide groove (802) by the plurality of flow distribution chambers (401) are driven by the servo motor (805) to rotate the transmission shaft (806), thereby driving the quantitative roller (807) to rotate at a uniform speed in the rectangular uniform distribution tube (801), and the rice seeds accumulated in the guide groove (802) are quantitatively extracted through the plurality of quantitative output grooves (808) on the quantitative roller (807) into the rectangular uniform distribution tube (801), so that the rice seeds are evenly distributed in the rectangular uniform distribution tube (801) and fall down; S301a: Amount of rice seeds put into a single quantitative output tank (808): ； in, is the rice seed storage capacity of a single quantitative output tank (808), is the length of the quantitative output slot (808), is the depth of the quantitative output groove (808), is the rice seed particle size, is the shape and stacking coefficient of rice seeds, is the filling rate; S301b: Total amount of rice seeds released within the specified time: Q= ； in, is the number of quantitative output slots (808), For in time Speed The number of revolutions of the inner metering roller (807); S302: Rice seeds are evenly distributed; The rice seeds quantitatively fed into the rectangular uniform distribution tube (801) slide out of the quantitative output trough (808) and fall in a flat shape in the rectangular uniform distribution tube (801), thereby achieving uniform distribution in the rectangular uniform distribution tube (801); S303: impurity absorption; The exhaust fan (903) cooperates with a cover plate (1001) having two exhaust pipes (1002) to draw external air into the rectangular uniformly distributed pipe (801) through a plurality of air inlets (804), and enters the impurity storage pipe (901) through the outflow port (803), the S-shaped flow guide pipe (501), and the inflow port (902) in sequence, and the airflow passing through the flattened falling rice seed flow guides the tiny impurities and shrunken rice seeds contained in the rice seeds to enter the impurity storage pipe (901), thereby completing the screening of the rice seeds that meet the standards; S303a: Minimum wind speed required to suck up tiny impurities and shrunken rice seeds: ； in, The minimum wind speed required to suck up tiny impurities and shrunken rice seeds. For the density of tiny impurities and shriveled rice seeds, is the average particle size of tiny impurities and shriveled rice seeds. is the air pressure, is the air constant, is the absolute temperature of the air, is the acceleration due to gravity, is the viscosity of air, is the surface roughness coefficient of tiny impurities and shriveled rice seeds, The particle shape factor is used to correct the calculation of particle radius to more accurately reflect the effect of actual particle shape on movement, as tiny impurities and shriveled rice seeds are not perfect spheres. S303b: actual wind speed of the exhaust fan (903); In order to ensure that tiny impurities and shrunken rice seeds can be sucked up, the wind speed generated by the exhaust fan (903) should be greater than or equal to the minimum speed required to suck up the impurities, that is, , so the wind speed algorithm formula is: ； in, The exhaust fan (903) is used to achieve the required wind speed for removing dust and shrunken rice seeds. is the speed of the exhaust fan (903), is the blade shape coefficient of the exhaust fan (903), is a proportionality coefficient used to establish a preliminary proportional relationship between the rotation speed of the exhaust fan (903) and the wind speed. The turbulence coefficient takes into account the effect of the turbulence of air flow on wind speed. Turbulence will make the wind speed distribution uneven. This coefficient is used to modify the wind speed formula to reflect the effect of turbulence. S303c: Effect of pipes on wind pressure; The flow of wind in the vertically arranged rectangular uniformly distributed pipe (801) and the impurity storage pipe (901) and the inclinedly arranged S-shaped flow guide pipe (501) will be affected by the pipe resistance, and the total pipe resistance is: ； in, is the resistance function of the pipeline, is the length of the rectangular uniformly distributed tube (801), , are the diameters of the impurity storage pipe (901) and the S-shaped flow guide pipe (501), respectively. is the inclination angle of the S-shaped flow guide tube (501), is the friction coefficient of the pipe, is the total length of the pipeline, is the local drag coefficient, is the air density under standard conditions, is the humidity coefficient, is the relative humidity, The exhaust fan (903) is used to achieve the required wind speed for removing dust and shrunken rice seeds. is the wind speed correction factor; S303d: actual wind pressure; The actual wind pressure acting on rice seeds, tiny impurities, and shriveled rice seeds is: ； S4: discharge of rice seeds, tiny impurities and shriveled rice seeds; The rice seeds after air selection directly fall into the lower hopper (7) through the rectangular uniformly distributed pipe (801), and the tiny impurities and shrunken rice seeds selected by air are stopped and the electric butterfly valve (904) is opened when the eccentric screening mechanism (3) rotates counterclockwise eccentrically, so that the tiny impurities and shrunken rice seeds guided to one side of the impurity storage pipe (901) through the inclined screening plate (1004) are discharged through the impurity storage pipe (901), thereby achieving the screening operation of rice seeds for rice planting.

2. The screening method of the rice seed screening device for rice planting according to claim 1, characterized in that: The eccentric screening mechanism (3) comprises an electric motor (301), the electric motor (301) being fixedly arranged at the center of the bottom end of the support frame (2), and a motor shaft of the electric motor (301) passing through one end of the support frame (2) is fixedly mounted with an arc-shaped transmission handle (302), a yaw mechanism is rotatably mounted at the other end of the arc-shaped transmission handle (302), and a ball groove for rotatably connecting the yaw mechanism is provided at the center of the top end of the support frame (1).

3. The screening method of the rice seed screening device for rice planting according to claim 2, characterized in that: The deflection mechanism comprises a large impurity screening frame (303), a medium impurity screening frame (304) and a small impurity screening frame (305); the large impurity screening frame (303), the medium impurity screening frame (304) and the small impurity screening frame (305) are stacked and fixed from top to bottom, and the outer edge surfaces of the large impurity screening frame (303), the medium impurity screening frame (304) and the small impurity screening frame (305) are all connected with a circular arc-shaped discharge port (306); the inner bottoms of the large impurity screening frame (303) and the medium impurity screening frame (304) are both provided with uniformly distributed screening holes (307); and the outer circumference of the inner bottom end of the small impurity screening frame (305) is provided with annular screening holes (308).

4. The screening method of the rice seed screening device for rice planting according to claim 3, characterized in that: The top end of the large impurity screening frame (303) is provided with a mounting frame (309), and the center of the top end of the mounting frame (309) is provided with a ball shaft (310), and the ball shaft (310) is rotatably disposed in the ball groove; the center of the bottom end of the small impurity screening frame (305) is provided with a shaft (311), and the shaft (311) is rotatably disposed in the arc-shaped transmission handle (302).

5. The screening method of the rice seed screening device for rice planting according to claim 4, characterized in that: The rice seed passing mechanism (8) comprises a rectangular evenly distributed tube (801), the top end of the rectangular evenly distributed tube (801) is provided with a guide groove (802), and the guide groove (802) is connected to the flow diversion chamber (401), a flow outlet (803) connected to the lower end of the S-shaped guide tube (501) is configured on one side of the rectangular evenly distributed tube (801) facing the impurity passing mechanism (9), and a plurality of air inlets (804) corresponding to the flow outlet (803) are equidistantly provided on the other side of the rectangular evenly distributed tube (801), and a quantitative mechanism for quantitatively distributing rice seeds below is installed on the top of the rectangular evenly distributed tube (801).

6. The screening method of the rice seed screening device for rice planting according to claim 5, characterized in that: The quantitative mechanism comprises a servo motor (805), the servo motor (805) being fixedly arranged at the top of one side of the S-shaped flow guide tube (501), and a motor shaft of the servo motor (805) extending into the rectangular uniformly distributed tube (801) and having a transmission shaft (806) installed at one end thereof, the transmission shaft (806) being rotatably arranged between the tops of two sides of the rectangular uniformly distributed tube (801), and a quantitative roller (807) being fixedly arranged on the outer edge surface of the transmission shaft (806), and a plurality of quantitative output grooves (808) being provided in a ring array on the outer edge surface of the quantitative roller (807).

7. The screening method of the rice seed screening device for rice planting according to claim 6, characterized in that: The impurity passing mechanism (9) comprises an impurity storage pipe (901), and a flow inlet (902) connected to the high end of the S-shaped flow guide pipe (501) is configured on the side of the impurity storage pipe (901) facing the rice seed passing mechanism (8), and an exhaust fan (903) is fixedly arranged on one side of the outer edge surface of the impurity storage pipe (901), and an air guide mechanism (10) and an electric butterfly valve (904) are respectively installed at the top and bottom ends of the impurity storage pipe (901), and the air guide mechanism (10) is connected to the exhaust fan (903).

8. The screening method of the rice seed screening device for rice planting according to claim 7, characterized in that: The air guide mechanism (10) comprises a cover plate (1001), the cover plate (1001) being detachably mounted on the top of the impurity storage pipe (901), and exhaust pipes (1002) connected to an exhaust fan (903) are mounted on both sides of the top of the cover plate (1001), arc-shaped extension plates (1003) extending into the impurity storage pipe (901) are constructed on both sides of the bottom of the cover plate (1001), and the bottom ends of the two arc-shaped extension plates (1003) are jointly constructed with an inclined screening plate (1004), and the lower end of the inclined screening plate (1004) is away from the inlet (902).

9. The screening method of the rice seed screening device for rice planting according to claim 8, characterized in that: The feeding assembly (6) comprises a feeding hopper (601), the bottom end of which is symmetrically structured with two supporting legs (602) fixedly connected to the supporting frame (1), and an extension rod (603) is fixedly mounted on one side of the feeding hopper (601), and a monitoring camera (604) for monitoring the downstream flow of rice seeds is fixedly mounted on one end of the extension rod (603).

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