Screening device and screening method for harvesting small-particle seeds

Abstract

The present invention discloses a screening device and screening method for harvesting small-particle seeds, and relates to the field of screening devices for harvesting small-particle seeds. A screening device for harvesting small-particle seeds comprises a screening box, a stirring tank, and a temporary storage box. The screening box is connected to a connecting pipe, the discharge end of the connecting pipe is connected to the stirring tank, the stirring tank is fixedly connected to a driving motor, a rotating shaft is rotatably connected in the stirring tank, and the rotating shaft is fixedly connected to the driving motor. The device also comprises: multiple groups of piston cylinders fixedly connected to the rotating shaft, piston rods slidably connected in the piston cylinders, and springs sleeved on the piston rods. The present invention uses the arrangement of the piston cylinders to suck in and discharge liquid through the piston cylinders when cleaning and screening seeds, thereby achieving different liquid flows, improving the cleaning effect, and further improving the seed screening effect, avoiding debris from adhering to the seeds, and facilitating subsequent use.

Description

Technical Field

[0001] The present invention belongs to the technical field of screening devices for harvesting small-particle seeds, and in particular relates to a screening device and a screening method for harvesting small-particle seeds. Background Art

[0002] Small-grain seeds are small in size. In order to avoid carrying a large amount of debris during harvesting, they need to be screened as needed to avoid affecting subsequent seed testing or packaging.

[0003] An existing seed grading and screening device with high sorting efficiency, such as the patent application number CN202210163900.2, is entitled "An invention patent for a seed grading and screening device with high sorting efficiency". It specifically relates to a seed grading and screening device with high sorting efficiency, comprising a tank body, wherein the tank body is a vertical structure, and a plurality of leak plates are arranged on its inner cavity at equal distances from top to bottom, and the leak plates are provided with a plurality of leak holes, wherein the leak holes of the plurality of leak plates decrease in size from top to bottom, and a screening assembly is further provided above the leak plates, which pushes the seeds on the top surface of the leak plates to circulate in the tank body and fall downward through the leak holes in sequence. Compared with traditional screening devices, this device does not use a vibration motor to screen seeds, but instead uses a push plate to push the seeds into the leak holes for step-by-step screening, thereby improving the screening quality. The push plate is made of hard rubber material to avoid damaging the seeds in the process of pushing the seeds and protect the integrity of the seeds. At the same time, the amount of screening that can be handled by this device is also improved.

[0004] The existing device has certain deficiencies when in use. During screening, the screening effect is poor, and a large amount of debris will still be attached to or wrapped on the seeds, affecting subsequent testing or packaging. There are certain deficiencies. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a screening device for harvesting small-particle seeds that can overcome the above problems or at least partially solve the above problems.

[0006] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a screening device for harvesting small-particle seeds, comprising a screening box, a stirring tank, and a temporary storage box, wherein the screening box is connected to a connecting pipe, the discharge end of the connecting pipe is connected to the stirring tank, the stirring tank is fixedly connected to a drive motor, a rotating shaft is rotatably connected in the stirring tank, and the rotating shaft is fixedly connected to the drive motor, and further comprising:

[0007] Multiple groups of piston cylinders are fixedly connected to the rotating shaft, piston rods are slidably connected in the piston cylinders, and springs are sleeved on the piston rods;

[0008] A wavy inner wall is provided in the mixing tank, and the piston rod is in contact with the wavy inner wall;

[0009] A water inlet is provided on the piston cylinder, and a one-way valve is provided in the water inlet;

[0010] A frame is fixedly connected to the water inlet, a filter screen is provided in the frame, a sliding rod is slidably connected to the filter screen, a return spring is sleeved on the sliding rod, a knocking rod is connected to the sliding rod, and a knocking block is fixedly connected below the knocking rod;

[0011] A water outlet pipe is provided on the piston cylinder, a water outlet is provided at the air outlet end of the water outlet pipe, the water outlet is obliquely provided in the rotating shaft, and a one-way valve is provided in the water outlet pipe;

[0012] A pipeline is provided in the mixing tank, the other end of the pipeline is connected to the temporary storage box, and a valve is provided in the pipeline;

[0013] The screening device is arranged in the screening box.

[0014] In order to facilitate the screening of small seeds, the screening device further includes a filter plate, an inclined plate, and a spring member. The filter plate and the inclined plate are both inclined. The spring member is used to lift the filter plate and the inclined plate. The filter plate is located above the inclined plate, and the high end of the filter plate is located below the feed end of the screening box. The bottom end of the inclined plate is located below the high end of the filter plate, and the bottom end of the inclined plate is connected to the connecting pipe.

[0015] In order to facilitate installation, further, a plurality of mounting blocks are fixedly connected in the screening box, and the spring members are connected to the mounting blocks.

[0016] In order to facilitate the synchronous shaking of the two layers of plates, further, an extension rod is sleeved in part of the spring parts, and the extension rod passes through the mounting block below. The two ends of the mounting block are respectively connected to the high end of the filter plate and the bottom end of the inclined plate.

[0017] In order to improve the screening effect, a fan is further fixedly connected to the screening box, and the air inlet and outlet ends of the fan are respectively connected to the air outlet pipe and the air inlet pipe. The air outlet end of the air outlet pipe is located below the high end of the filter plate, and the air inlet end of the air inlet pipe is located at the top of the screening box.

[0018] In order to facilitate the recovery of impurities, further, the screening box is provided with a sewage outlet, the sewage outlet is located at the bottom end of the filter plate, and a recovery box is provided next to the screening box, and the recovery box is communicated with the sewage outlet.

[0019] In order to facilitate the replenishment of water, a water tank is further provided below the recovery tank, the bottom end of the water tank is higher than the high end of the mixing tank, a liquid outlet pipe is connected to the water tank, the liquid outlet pipe is communicated with the mixing tank, and a valve is provided in the liquid outlet pipe.

[0020] In order to facilitate the discharge of water, a water pump is further provided in the water tank, and a recovery pipe is provided at the liquid inlet end of the water pump, and the recovery pipe is communicated with the stirring tank.

[0021] In order to facilitate drying of the seeds, a heating plate is further provided in the temporary storage box.

[0022] A screening method for harvesting small-particle seeds, used in a screening device for harvesting small-particle seeds, employing the following steps:

[0023] Step 1: Put the seeds into the screening box and perform preliminary screening on the seeds. Then the screened seeds fall into the mixing tank below;

[0024] Step 2: Start the drive motor and add water to clean the seeds, perform secondary screening and cleaning;

[0025] Step 3: Turn off the drive motor, wait for the seeds in the water to sink to the bottom, open the valve, and move the seeds to the temporary storage box;

[0026] Step 4: Start the heating plate and evaporate the water at a temperature of 20 degrees Celsius.

[0027] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: the present invention uses the setting of the piston cylinder to suck in and discharge the liquid through the piston cylinder when cleaning and screening the seeds, thereby realizing different liquid flows, improving the cleaning effect, and then improving the seed screening effect, avoiding debris from sticking to the seeds, and facilitating subsequent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In the attached figure:

[0029] Figure 1 Schematic diagram of the three-dimensional structure of a screening device for harvesting small-particle seeds proposed by the present invention Figure 1 ;

[0030] Figure 2 A screening device for harvesting small-particle seeds proposed by the present invention Figure 1 Schematic diagram of the structure of part A;

[0031] Figure 3 A screening device for harvesting small-particle seeds proposed by the present invention Figure 1 Schematic diagram of the structure of part B;

[0032] Figure 4 A screening device for harvesting small-particle seeds proposed by the present invention Figure 1 Schematic diagram of the structure of part C;

[0033] Figure 5 A screening device for harvesting small-particle seeds proposed by the present invention Figure 3 Schematic diagram of the structure of part D;

[0034] Figure 6 This is a schematic diagram of the three-dimensional structure of the wavy inner wall of the stirring tank in a screening device for harvesting small-particle seeds proposed by the present invention.

[0035] In the figure: 1. Screening box; 101. Mounting block; 102. Spring member; 103. Filter plate; 104. Inclined plate; 105. Air port; 106. Telescopic motor; 1061. Connecting rod; 107. Fan; 1071. Exhaust pipe; 1072. Inlet pipe; 108. Sewage outlet; 109. Connecting pipe; 2. Mixing tank; 201. Drive motor; 202. Rotating shaft; 203. Piston cylinder; 2 04. Piston rod; 205. Water outlet; 206. Water outlet pipe; 207. Water inlet; 208. Filter; 2081. Frame; 2091. Sliding rod; 2092. Return spring; 2093. Knocking rod; 2094. Knocking block; 3. Recovery box; 4. Water tank; 401. Water pump; 402. Recovery pipe; 403. Liquid outlet pipe; 5. Temporary storage box; 501. Pipeline; 502. Heating plate. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0037] Example 1:

[0038] Reference Figure 1-6A screening device for harvesting small-particle seeds includes a screening box 1, a mixing tank 2, and a temporary storage box 5. The screening box 1 is connected to a connecting pipe 109, and the discharge end of the connecting pipe 109 is connected to the mixing tank 2. The mixing tank 2 is fixedly connected to a driving motor 201. A rotating shaft 202 is rotatably connected in the mixing tank 2. The rotating shaft 202 is fixedly connected to the driving motor 201. It also includes: multiple groups of piston cylinders 203, which are fixedly connected to the rotating shaft 202. A piston rod 204 is slidably connected in the piston cylinder 203. The piston rod 204 is sleeved with a spring; the wavy inner wall is provided in the mixing tank 2, and the piston rod 204 is in contact with the wavy inner wall; the water inlet 207 is provided on the piston cylinder 203, and a one-way valve is provided in the water inlet 207; the frame 2081 is fixedly connected to the water inlet 207, a filter 208 is provided in the frame 2081, and a sliding rod 2091 is slidably connected to the filter 208, and a return spring 2092 is sleeved on the sliding rod 2091, and a knocking rod 2093 is connected to the sliding rod 2091 to knock A knock block 2094 is fixedly connected to the lower part of the rod 2093; a water outlet pipe 206 is provided on the piston cylinder 203, and a water outlet 205 is provided at the air outlet end of the water outlet pipe 206, and the water outlet 205 is tilted and arranged in the rotating shaft 202, and a one-way valve is provided in the water outlet pipe 206; a pipeline 501 is provided in the mixing tank 2, and the other end of the pipeline 501 is connected to the temporary storage box 5, and a valve is provided in the pipeline 501; a screening device is provided in the screening box 1; a sewage outlet 108 is provided on the screening box 1, and the sewage outlet 108 is provided. 8 is located at the bottom end of the filter plate 103, and a recovery box 3 is provided next to the screening box 1, and the recovery box 3 is communicated with the sewage outlet 108; a water tank 4 is provided below the recovery box 3, and the bottom end of the water tank 4 is higher than the high end of the stirring tank 2, and a liquid outlet pipe 403 is connected to the water tank 4, and the liquid outlet pipe 403 is communicated with the stirring tank 2, and a valve is provided in the liquid outlet pipe 403; a water pump 401 is provided in the water tank 4, and a recovery pipe 402 is provided at the liquid inlet end of the water pump 401, and the recovery pipe 402 is communicated with the stirring tank 2; a heating plate 502 is provided in the temporary storage box 5.

[0039] When the device is in use, the feed port on the screening box 1 is connected to the discharge end of the harvesting device. At this time, as the harvesting device is used, small-particle seeds will continuously enter the screening box 1 through the feed port, undergo preliminary screening in the screening box 1, and enter the mixing tank 2 through the connecting pipe 109. At the same time, debris will enter the recovery box 3 through the sewage outlet 108.

[0040] When the seeds continue to enter the mixing tank 2, the control valve is opened to discharge the water in the water tank 4 into the mixing tank 2. At this time, the drive motor 201 can be started to stir the water and seeds. The stirring at this time can remove the debris on the seeds and have a screening effect. At the same time, the wavy inner wall will interfere with the flow of water, forming turbulence, which promotes the cleaning effect. At the same time, the piston rod 204 moves continuously under the action of the wavy inner wall. At this time, the piston cylinder 203 will suck in the water inside and then discharge it. At this time, the stirring shaft can be realized at the same time, and the surrounding water is disturbed by the continuously discharged water, which again promotes the stirring effect and improves the screening effect until the harvesting device completes the harvesting. After stirring for ten minutes again, the excess water can be discharged through the water pump 401, and then the control valve in the pipeline 501 is opened to discharge the mixture of small-particle seeds and water into the temporary storage box 5. The heating plate 502 is turned on to dry the excess water at a not too high temperature. It can also be not set and only air-dried to avoid damage to the seeds caused by the heating plate 502.

[0041] Example 2:

[0042] Reference Figure 1-5 , a screening device for harvesting small-particle seeds is basically the same as Example 1, further comprising: the screening device includes a filter plate 103, an inclined plate 104, and a spring member 102, the filter plate 103 and the inclined plate 104 are all inclinedly arranged, the spring member 102 is used to lift the filter plate 103 and the inclined plate 104, the filter plate 103 is located above the inclined plate 104, and the high end of the filter plate 103 is located below the feed end of the screening box 1, the bottom end of the inclined plate 104 is located below the high end of the filter plate 103, the bottom end of the inclined plate 104 is communicated with the connecting pipe 109, and multiple groups of mounting blocks 101 are fixedly connected in the screening box 1, the spring member 102 is connected to the mounting block 101, and an extension rod is sleeved in part of the spring member 102, and the extension rod passes through the mounting block 101 below, and the two ends of the mounting block 101 are respectively connected to the high end of the filter plate 103 and the bottom end of the inclined plate 104.

[0043] When the device is in use, the feed port on the screening box 1 is connected to the discharge end of the harvesting device. At this time, as the harvesting device is used, small-particle seeds will continuously enter the screening box 1 through the feed port. At this time, the seeds first reach the high end of the filter plate 103, and the smaller small-particle seeds will pass through the filter plate 103 and fall onto the inclined plate 104 below. At the same time, the remaining larger impurities will pass through the sewage outlet 108 and enter the recovery box 3. They will undergo preliminary screening in the screening box 1 and enter the mixing tank 2 through the connecting pipe 109.

[0044] When the seeds continue to enter the mixing tank 2, the control valve is opened to discharge the water in the water tank 4 into the mixing tank 2. At this time, the drive motor 201 can be started to stir the water and seeds. The stirring at this time can remove the debris on the seeds and have a screening effect. At the same time, the wavy inner wall will interfere with the flow of water, forming turbulence, which promotes the cleaning effect. At the same time, the piston rod 204 moves continuously under the action of the wavy inner wall. At this time, the piston cylinder 203 will suck in the water inside and then discharge it. At this time, the stirring shaft can be realized at the same time, and the surrounding water is disturbed by the continuously discharged water, which again promotes the stirring effect and improves the screening effect until the harvesting device completes the harvesting. After stirring for ten minutes again, the excess water can be discharged through the water pump 401, and then the control valve in the pipeline 501 is opened to discharge the mixture of small-particle seeds and water into the temporary storage box 5. The heating plate 502 is turned on to dry the excess water at a not too high temperature. It can also be not set and only air-dried to avoid damage to the seeds caused by the heating plate 502.

[0045] Example 3:

[0046] Reference Figure 1 、 2 , a screening device for harvesting small-particle seeds, which is basically the same as Example 2, further comprising: a fan 107 is fixedly connected to the screening box 1, and the air inlet and outlet ends of the fan 107 are respectively connected to an outlet pipe 1071 and an air inlet pipe 1072, the outlet end of the outlet pipe 1071 is located below the high end of the filter plate 103, and the air inlet end of the air inlet pipe 1072 is located at the top of the screening box 1.

[0047] When the device is in use, the feed port on the screening box 1 is connected to the discharge end of the harvesting device. At this time, as the harvesting device is used, small-particle seeds will continuously enter the screening box 1 through the feed port. At this time, the seeds first reach the high end of the filter plate 103, and the smaller small-particle seeds will pass through the filter plate 103 and fall onto the inclined plate 104 below. At the same time, the remaining larger impurities will pass through the sewage outlet 108 and enter the recovery box 3. At the same time, the fan 107 can be started to improve the screening effect of the seeds by wind power, perform preliminary screening in the screening box 1, and enter the mixing tank 2 through the connecting pipe 109.

[0048] When the seeds continue to enter the mixing tank 2, the control valve is opened to discharge the water in the water tank 4 into the mixing tank 2. At this time, the drive motor 201 can be started to stir the water and seeds. The stirring at this time can remove the debris on the seeds and have a screening effect. At the same time, the wavy inner wall will interfere with the flow of water, forming turbulence, which promotes the cleaning effect. At the same time, the piston rod 204 moves continuously under the action of the wavy inner wall. At this time, the piston cylinder 203 will suck in the water inside and then discharge it. At this time, the stirring shaft can be realized at the same time, and the surrounding water is disturbed by the continuously discharged water, which again promotes the stirring effect and improves the screening effect until the harvesting device completes the harvesting. After stirring for ten minutes again, the excess water can be discharged through the water pump 401, and then the control valve in the pipeline 501 is opened to discharge the mixture of small-particle seeds and water into the temporary storage box 5. The heating plate 502 is turned on to dry the excess water at a not too high temperature. It can also be not set and only air-dried to avoid damage to the seeds caused by the heating plate 502.

[0049] Example 4:

[0050] Reference Figure 4 , a screening device for harvesting small-particle seeds, which is basically the same as Example 3, and further: the screening box 1 is provided with an empty opening 105, the empty opening 105 is provided with a telescopic motor 106, the telescopic end of the telescopic motor 106 is provided with a connecting rod 1061, and the connecting rod 1061 is fixedly connected to the high end of the filter plate 103.

[0051] When the device is in use, the feed port on the screening box 1 is connected to the discharge end of the harvesting device. At this time, as the harvesting device is used, small-particle seeds will continuously enter the screening box 1 through the feed port. At this time, the seeds first reach the high end of the filter plate 103, and the smaller small-particle seeds will pass through the filter plate 103 and fall onto the inclined plate 104 below. At the same time, the remaining larger impurities will pass through the sewage outlet 108 and enter the recovery box 3. They will undergo preliminary screening in the screening box 1 and enter the mixing tank 2 through the connecting pipe 109.

[0052] In order to improve the screening effect, the telescopic motor 106 can be started at this time, and the telescopic end of the telescopic motor 106 drives the filter plate 103 to move up and down, thereby promoting the screening effect.

[0053] The feed port of the screening box 1 should be far away from the opening 105 to prevent seeds from falling out.

[0054] When the seeds continue to enter the mixing tank 2, the control valve is opened to discharge the water in the water tank 4 into the mixing tank 2. At this time, the drive motor 201 can be started to stir the water and seeds. The stirring at this time can remove the debris on the seeds and have a screening effect. At the same time, the wavy inner wall will interfere with the flow of water, forming turbulence, which promotes the cleaning effect. At the same time, the piston rod 204 moves continuously under the action of the wavy inner wall. At this time, the piston cylinder 203 will suck in the water inside and then discharge it. At this time, the stirring shaft can be realized at the same time, and the surrounding water is disturbed by the continuously discharged water, which again promotes the stirring effect and improves the screening effect until the harvesting device completes the harvesting. After stirring for ten minutes again, the excess water can be discharged through the water pump 401, and then the control valve in the pipeline 501 is opened to discharge the mixture of small-particle seeds and water into the temporary storage box 5. The heating plate 502 is turned on to dry the excess water at a not too high temperature. It can also be not set and only air-dried to avoid damage to the seeds caused by the heating plate 502.

[0055] Example 4:

[0056] Reference Figure 1-6 A screening method for harvesting small-particle seeds and a screening device for harvesting small-particle seeds are provided, comprising the following steps:

[0057] Step 1: Put the seeds into the screening box 1, perform preliminary screening on the seeds, and then the screened seeds fall into the mixing tank 2 below;

[0058] Step 2: Start the drive motor 201 and add water to clean the seeds, perform secondary screening and cleaning;

[0059] Step 3: Turn off the drive motor 201, wait for the seeds in the water to sink to the bottom, open the valve, and move the seeds into the temporary storage box 5;

[0060] Step 4: Start the heating plate 502 to evaporate the water at a temperature of 20 degrees Celsius.

[0061] The present invention adopts the setting of the piston cylinder 203. When cleaning and screening seeds, the liquid is sucked in and then discharged through the piston cylinder 203, thereby achieving different liquid flows, improving the cleaning effect, and then improving the seed screening effect, avoiding debris from sticking to the seeds, and facilitating subsequent use.

[0062] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above technical content without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A screening device for harvesting small-particle seeds, comprising a screening box (1), a stirring tank (2), and a temporary storage box (5), wherein the screening box (1) is connected to a connecting pipe (109), a discharge end of the connecting pipe (109) is connected to the stirring tank (2), a driving motor (201) is fixedly connected to the stirring tank (2), a rotating shaft (202) is rotatably connected in the stirring tank (2), and the rotating shaft (202) is fixedly connected to the driving motor (201), characterized in that: Also includes: Multiple groups of piston cylinders (203) are fixedly connected to the rotating shaft (202), piston rods (204) are slidably connected in the piston cylinders (203), and springs are sleeved on the piston rods (204); A wavy inner wall is provided in the mixing tank (2), and the piston rod (204) is in contact with the wavy inner wall; A water inlet (207) is provided on the piston cylinder (203), and a one-way valve is provided in the water inlet (207); A frame (2081) is fixedly connected to the water inlet (207); a filter screen (208) is provided in the frame (2081); a sliding rod (2091) is slidably connected to the filter screen (208); a return spring (2092) is sleeved on the sliding rod (2091); a knocking rod (2093) is connected to the sliding rod (2091); and a knocking block (2094) is fixedly connected below the knocking rod (2093); A water outlet pipe (206) is provided on the piston cylinder (203); a water outlet (205) is provided at the air outlet end of the water outlet pipe (206); the water outlet (205) is obliquely provided inside the rotating shaft (202); and a one-way valve is provided inside the water outlet pipe (206); A pipeline (501) is provided in the stirring tank (2), the other end of the pipeline (501) is communicated with the temporary storage box (5), and a valve is provided in the pipeline (501); A screening device is arranged in the screening box (1).

2. A screening device for harvesting small-particle seeds according to claim 1, characterized in that: The screening device comprises a filter plate (103), an inclined plate (104), and a spring member (102). The filter plate (103) and the inclined plate (104) are both arranged at an angle. The spring member (102) is used to lift the filter plate (103) and the inclined plate (104). The filter plate (103) is located above the inclined plate (104), and the upper end of the filter plate (103) is located below the feed end of the screening box (1). The lower end of the inclined plate (104) is located below the upper end of the filter plate (103), and the lower end of the inclined plate (104) is communicated with the connecting pipe (109).

3. The screening device for collecting small-particle seeds according to claim 2, characterized in that: A plurality of mounting blocks (101) are fixedly connected in the screening box (1), and the spring members (102) are connected to the mounting blocks (101).

4. The screening device for harvesting small-particle seeds according to claim 3, characterized in that: An extension rod is sleeved inside a portion of the spring member (102), and the extension rod passes through the mounting block (101) below. The two ends of the mounting block (101) are respectively connected to the upper end of the filter plate (103) and the lower end of the inclined plate (104).

5. The screening device for collecting small-particle seeds according to claim 2, characterized in that: The screening box (1) is fixedly connected to a fan (107), and the air inlet and outlet ends of the fan (107) are respectively connected to an air outlet pipe (1071) and an air inlet pipe (1072). The air outlet end of the air outlet pipe (1071) is located below the upper end of the filter plate (103), and the air inlet end of the air inlet pipe (1072) is located at the top end of the screening box (1).

6. The screening device for collecting small-particle seeds according to claim 2, characterized in that: The screening box (1) is provided with a sewage outlet (108), and the sewage outlet (108) is located at the bottom end of the filter plate (103). A recovery box (3) is provided next to the screening box (1), and the recovery box (3) is communicated with the sewage outlet (108).

7. The screening device for collecting small-particle seeds according to claim 6, characterized in that: A water tank (4) is provided below the recovery tank (3), the bottom end of the water tank (4) being higher than the top end of the stirring tank (2), a liquid outlet pipe (403) being connected to the water tank (4), the liquid outlet pipe (403) being in communication with the stirring tank (2), and a valve being provided in the liquid outlet pipe (403).

8. The screening device for collecting small-particle seeds according to claim 7, characterized in that: A water pump (401) is provided in the water tank (4), a recovery pipe (402) is provided at the liquid inlet end of the water pump (401), and the recovery pipe (402) is communicated with the stirring tank (2).

9. The screening device for harvesting small-particle seeds according to claim 1, characterized in that: A heating plate (502) is provided in the temporary storage box (5).

10. A screening method for harvesting small-particle seeds, used with the screening device for harvesting small-particle seeds according to claim 9, comprising the following steps, characterized in that: Step 1: Put the seeds into the screening box (1) to perform preliminary screening on the seeds, and then the screened seeds fall into the mixing tank (2) below; Step 2: Start the driving motor (201), add water, wash the seeds, perform secondary screening and washing; Step 3: Turn off the drive motor (201), wait for the seeds in the water to sink to the bottom, open the valve, and move the seeds into the temporary storage box (5); Step 4: Start the heating plate (502) to evaporate the water at a temperature of 20 degrees Celsius.

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