Seed screening device for agricultural technology popularization

By designing anti-cluster components and screening components in the seed screening device, using a fan and a stirring rod to disperse the clump seeds, and achieving seed grading screening through the motor-driven screening box vibration. At the same time, dust filter components are set to remove dust, which solves the problems of poor seed screening and difficult dust removal in the prior art, and improves the efficiency and quality of seed screening.

CN222805574UActive Publication Date: 2025-04-29徐辉
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Patent Information

Application Number
CN202421432269.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-21
Publication Date
2025-04-29
Estimated Expiration
2034-06-21

AI Technical Summary

Technical Problem

The existing seed screening device for agricultural technology promotion can easily cause seeds to get stuck on the filter screen during the screening process and cannot fall, which requires personnel to clean it up. The device lacks the function of breaking and drying the agglomerated seeds, resulting in unsatisfactory screening effect and difficulty in collecting dust, affecting the quality of the seeds.

Method used

A seed screening device for agricultural technology promotion is designed, which includes anti-cluster assembly and screening assembly. The heating air blown in the fan and the rotation of the stirring rod will disperse the clump seeds, and vibrate through the motor-driven screening box to avoid blocking the mesh holes and realize seed grading screening. At the same time, a dust filter assembly is installed, and the dust on the seed surface is blown into the dust filter bucket through the rotation of the fan blade, realizing the separation of seeds and dust.

Benefits of technology

The functions of breaking and drying of clumped seeds are realized, the efficiency and effect of seed screening are improved, the problem of seed blockage is avoided, and the dust on the seed surface is effectively removed through the dust filter assembly, improving the seed quality.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a seed screening device for agricultural technology popularization, and relates to the technical field of seed screening devices.The seed screening device comprises a screening box body, the left side of the screening box body is fixedly connected with a first discharging plate in a penetrating mode, and the right side of the screening box body is fixedly connected with a second discharging plate in a penetrating mode; the top of the screening box body is fixedly connected with an anti-caking assembly, and a screening assembly and a dust filtering assembly are arranged in the screening box body. Through the anti-caking assembly and the screening assembly, air heated by a heating wire is blown into the outer frame through a fan, seeds are properly heated, a first motor drives a first rotating rod and a stirring rod to rotate, the caked seeds are scattered, a second motor drives a crank and a third connecting rod to rotate, and the seeds are screened. And meanwhile, the seeds can be screened in a classified mode, dust on the surfaces of the seeds is blown into a dust filtering hopper through rotation of a dust filtering assembly and fan blades, and separation of the seeds and the dust is achieved.
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Description

Technical Field

[0001] The utility model relates to the technical field of seed screening devices, in particular to a seed screening device for agricultural technology promotion. Background Art

[0002] The seed screening device is an efficient and accurate device designed to solve many problems in the seed screening process. The seed screening device uses the differences between seeds and inclusions in shape, size, specific gravity, surface characteristics and aerodynamic characteristics to achieve efficient seed screening through the combination of mechanical and electronic technologies. It is widely used in agricultural planting, horticultural planting and other fields to improve the quality and purity of seeds, thereby improving the yield and quality of crops. The existing technology has the following problems:

[0003] In the existing seed screening devices for agricultural technology promotion, seeds are often screened by falling on their own during the screening process. However, since the seed screening devices are often fixed, seeds are easily stuck on the filter net and cannot fall, requiring personnel to clean them out. The screening devices rarely achieve the functions of breaking up and drying agglomerated seeds when in use, which can easily lead to unsatisfactory screening effects due to excessive moisture. In addition, the screening devices rarely have the function of collecting dust inside the device body when in use, which can easily lead to dust adhering to the surface of the seeds and causing clutter. Utility Model Content

[0004] The utility model provides a seed screening device for agricultural technology promotion to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A seed screening device for agricultural technology promotion comprises a screening box, the four bottom corners of the screening box are fixedly connected with supporting legs, a control panel is arranged at the upper left corner of the front side wall of the screening box, a dust collecting drawer is slidably connected with the inner bottom of the screening box, a handle is arranged on the front side wall of the dust collecting drawer, a dust filter hopper connected with the inside of the screening box is arranged on the right side wall of the screening box, a first unloading plate is fixedly connected with the left side of the screening box, a second unloading plate is fixedly connected with the right side of the screening box, an anti-clumping component is fixedly connected with the top of the screening box, and a screening component and a dust filter component are arranged inside the screening box.

[0007] A further improvement of the technical solution of the utility model is that the interior of the dust filter hopper is hollow and the outer wall is provided with a mesh for filtering dust, the control panel is electrically connected to the anti-clumping component and the screening component inside the screening box, the first blanking plate and the second blanking plate are both inclined and the vertical height of the first blanking plate is higher than that of the second blanking plate.

[0008] A further improvement of the technical solution of the utility model is that the anti-clumping component includes an outer frame, the outer frame is hollow inside and the bottom is fixedly connected to the top of the screening box, the top of the screening box is provided with an opening located inside the outer frame, a feed port is provided at the left end of the top of the outer frame, a motor is fixedly connected to the middle of the top of the outer frame, the output end of the motor passes through the inner top wall of the outer frame and is connected to a rotating rod, a number of stirring rods are provided at equal distances above and below the side walls of the rotating rod, a bellows with a hollow interior is provided on the right side of the outer frame, a vent is provided on the right side wall of the bellows, a heating wire is fixedly connected to the upper and lower inner walls of the bellows, a fan connected to the interior of the outer frame is provided on the left side of the bellows, and a filter is provided on the left side of the fan.

[0009] A further improvement of the technical solution of the utility model is that: the screening component includes a motor 2 and four connecting rods 1, the tops of the four connecting rods 1 are rotatably connected to connecting blocks fixed at the four corners of the top wall of the screening box body, the bottoms of the four connecting rods 1 are rotatably connected to connecting rods 2, the bottoms of the four connecting rods 2 are rotatably connected to triangular fixed blocks, the front and rear opposite sides of the four triangular fixed blocks are fixedly connected to the first screening frame, the front and rear side walls of the first screening frame are fixedly connected to a plurality of front-to-back symmetrical fixed plates, and the lower ends of the front and rear opposite sides of the plurality of fixed plates are fixedly connected to the second screening frame, the front side wall of the motor 2 is fixedly connected to the rear outer wall of the screening box body, the output shaft of the motor 2 passes through the rear inner wall of the screening box body and the end is rotatably connected to the front inner wall of the screening box body, the output end shaft of the motor 2 is located at the lower left end of the second screening frame and the middle outer wall is fixedly connected to a crank, the right end of the crank is rotatably connected to a connecting rod 3, and the end of the connecting rod 3 away from the crank is rotatably connected to the raised block at the bottom of the right end of the second screening frame.

[0010] A further improvement of the technical solution of the utility model is that: the first screening box and the second screening box are both inclined, the mesh set on the top of the first screening box is larger than the mesh set on the top of the second screening box, and the lower ends of the unsealed sides of the first screening box and the second screening box are higher than the first blanking plate and the second blanking plate.

[0011] A further improvement of the technical solution of the utility model is that the dust filter assembly includes a turntable 1, the inner wall of the turntable 1 is fixedly connected to the outer wall of the rear end of the motor 2, the outer wall of the turntable 1 is connected to the turntable 2 through a belt drive, the inner wall of the turntable 2 is fixedly connected to a rotating shaft located at the upper left end of the first screening frame, the front and rear ends of the rotating shaft are respectively rotatably connected to the front and rear inner walls of the screening box body, a plurality of annularly distributed fan blades are fixedly connected to the middle outer wall of the rotating shaft, a cylindrical protective frame rotatably connected to the outer wall of the rotating shaft is arranged on the outside of the fan blade, the interior of the cylindrical protective frame is hollow and the surface is provided with openings.

[0012] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0013] 1. The utility model provides a seed screening device for agricultural technology promotion, which is provided with an anti-clumping component and a screening component. The air heated by the heating wire is blown into the outer frame by a fan to properly heat the seeds. At the same time, the motor drives the rotating rod and the stirring rod to rotate to break up the seeds that are clumped due to moisture. The broken seeds fall into the interior of the screening box. The motor drives the crank to rotate, and the rotation of the crank drives the connecting rod to rotate. The rotation of the connecting rod drives the second screening frame and the first screening frame to vibrate left and right to avoid clogging the mesh. The mesh of the first screening frame is larger than the mesh of the second screening frame, so that the seeds can be graded and screened.

[0014] 2. The utility model provides a seed screening device for agricultural technology promotion, in which a dust filter component is provided. A turntable 1 fixedly connected to an output shaft thereof is driven to rotate by a second motor. The rotation of the turntable 1 drives a second turntable connected to the turntable via a belt. The rotation of the turntable 2 drives a rotating shaft fixedly connected to the turntable to rotate. The rotation of the rotating shaft drives a fan blade fixedly connected to the surface thereof to rotate. When the fan blade rotates, dust on the surface of the seeds can be blown into the dust filter hopper, thereby separating the seeds from the dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the anti-agglomeration component structure of the utility model;

[0018] Figure 4 This is a schematic diagram of the screening component structure of the utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the dust filter assembly of the utility model.

[0020] In the figure: 101, screening box; 102, legs; 103, control panel; 104, dust collection drawer; 105, handle; 106, dust filter hopper; 107, first unloading plate; 108, second unloading plate; 2, anti-agglomeration component; 201, opening; 202, outer frame; 203, feed port; 204, motor 1; 205, rotating rod 1; 206, stirring rod; 207, bellows; 208, vent; 209, Heating wire; 210, fan; 3, screening component; 301, connecting rod one; 302, connecting rod two; 303, first screening frame; 304, fixing plate; 305, second screening frame; 306, motor two; 307, crank; 308, connecting rod three; 309, triangular fixing block; 4, dust filter component; 401, turntable one; 402, turntable two; 403, rotating shaft; 404, cylindrical protection frame; 405, fan blades. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods:

[0022] like Figure 1 , Figure 2 As shown, the utility model provides a seed screening device for agricultural technology promotion, including a screening box 101, the four bottom corners of the screening box 101 are fixedly connected with supporting legs 102, a control panel 103 is arranged at the upper left corner of the front side wall of the screening box 101, a dust collecting drawer 104 is slidably connected to the inner bottom of the screening box 101, a handle 105 is arranged on the front side wall of the dust collecting drawer 104, a dust filter hopper 106 connected to the inside of the screening box 101 is arranged on the right side wall of the screening box 101, a first unloading plate 107 is inserted and fixedly connected to the left side of the screening box 101, a second unloading plate 108 is inserted and fixedly connected to the right side of the screening box 101, an anti-agglomeration component 2 is fixedly connected to the top of the screening box 101, and a screening component 3 and a dust filter component 4 are arranged inside the screening box 101.

[0023] The dust collecting drawer 104 slidably connected to the inner bottom wall of the screening box 101 can be pulled out by the provided handle 105, and the small particles of stone with larger mass that fall into it can be cleaned up. The provided dust filter 106 is used in conjunction with the dust filter component 4 to blow the lighter dust into the dust filter 106, and then the dust inside the dust filter 106 is processed to effectively separate the dust on the outer surface of the seeds. The provided control panel 103 can control the switches of the motor 1 204, the fan 210, the heating wire 209 and the motor 2 306, and can also display the temperature inside the device and the speed of each motor. The provided anti-agglomeration component 2 can effectively break up the agglomerated seeds and appropriately heat the seeds to further avoid the seeds from being damp and agglomerated. The provided screening component 3 can screen seeds of different sizes. At the same time, the vibration of the first screening frame 303 and the second screening frame 305 can prevent the seeds from clogging the mesh. The provided dust filter component 4 can blow the dust on the surface of the seeds into the dust filter 106 to separate the seeds from the dust.

[0024] like Figure 1 , Figure 2 As shown, the interior of the dust filter hopper 106 is hollow and the outer wall is provided with a mesh for filtering dust, the control panel 103 is electrically connected to the anti-clumping component 2 and the screening component 3 inside the screening box 101, the first discharge plate 107 and the second discharge plate 108 are both inclined and the vertical height of the first discharge plate 107 is higher than that of the second discharge plate 108.

[0025] like Figure 3 As shown, the anti-agglomeration component 2 includes an outer frame 202, the outer frame 202 is hollow inside and the bottom is fixedly connected to the top of the screening box 101, the top of the screening box 101 is provided with an opening 201 located inside the outer frame 202, a feed port 203 is provided at the top left end of the outer frame 202, a motor 204 is fixedly connected to the middle of the top end of the outer frame 202, the output end of the motor 204 passes through the inner top wall of the outer frame 202 and is connected to a rotating rod 205, a plurality of stirring rods 206 are equidistantly provided on the upper and lower side walls of the rotating rod 205, a hollow bellows 207 is provided on the right side of the outer frame 202, a vent 208 is provided on the right side wall of the bellows 207, a heating wire 209 is fixedly connected to the upper and lower inner walls of the bellows 207, a fan 210 connected to the inside of the outer frame 202 is provided on the left side of the bellows 207, and a filter is provided on the left side of the fan 210.

[0026] When in use, first add the seeds to be screened into the outer frame 202 through the feed port 203, then start the fan 210, the heating wire 209 and the switch of the motor 204, and blow the air heated by the heating wire 209 into the outer frame 202 through the fan 210 to properly heat the seeds. At the same time, the motor 204 drives the rotating rod 205 connected thereto to rotate, and the rotation of the rotating rod 205 drives the stirring rod 206 connected thereto to rotate, so as to break up the seeds that are agglomerated due to moisture. The broken seeds fall into the interior of the screening box 101 through the opening 201 set at the top of the screening box 101, which is convenient for the next step of processing.

[0027] like Figure 4 As shown, the screening assembly 3 includes a second motor 306 and four connecting rods 1 301, the tops of the four connecting rods 1 301 are rotatably connected to the connecting blocks fixed at the four corners of the top wall of the screening box 101, the bottoms of the four connecting rods 1 301 are rotatably connected to the second connecting rod 302, the bottoms of the four connecting rods 2 302 are rotatably connected to the triangular fixed blocks 309, the front and rear opposite sides of the four triangular fixed blocks 309 are fixedly connected to the first screening frame 303, the front and rear side walls of the first screening frame 303 are fixedly connected to a plurality of front-to-back symmetrical fixed plates 304, and the front and rear opposite sides of the plurality of fixed plates 304 are fixedly connected to the front and rear opposite sides of the first screening frame 303. A second screening frame 305 is fixedly connected to the lower end of the opposite side, and the front side wall of the second motor 306 is fixedly connected to the rear outer wall of the screening box 101. The output shaft of the second motor 306 passes through the rear inner wall of the screening box 101 and the end is rotatably connected to the front inner wall of the screening box 101. The output end shaft of the second motor 306 is located at the lower left end of the second screening frame 305 and a crank 307 is fixedly connected to the middle outer wall. The right end of the crank 307 is rotatably connected to a connecting rod three 308, and the end of the connecting rod three 308 away from the crank 307 is rotatably connected to the raised block at the bottom right end of the second screening frame 305.

[0028] like Figure 4 As shown, the first screening box 303 and the second screening box 305 are both inclined, the mesh set at the top of the first screening box 303 is larger than the mesh set at the top of the second screening box 305, and the lower ends of the unsealed sides of the first screening box 303 and the second screening box 305 are higher than the first blanking plate 107 and the second blanking plate 108.

[0029] When it is necessary to screen the seeds, start motor 2 306, which drives crank 307 connected to its output shaft to rotate. The rotation of crank 307 drives connecting rod 3 308 rotatably connected to it to rotate. The rotation of connecting rod 308 drives the second screening frame 305 rotatably connected to it to vibrate left and right. Since the second screening frame 305 is fixedly connected to the first screening frame 303 on its top through the fixed plate 304, the vibration of the second screening frame 305 will drive the vibration of the first screening frame 303 to avoid clogging the mesh, and the mesh of the first screening frame 303 is larger than the mesh of the second screening frame 305, so that the seeds can be graded and screened, and the screened seeds pass through the first unloading plate 107 and the second unloading plate 108 respectively and fall into the designated position.

[0030] like Figure 5 As shown, the dust filter assembly 4 includes a turntable 401, the inner wall of which is fixedly connected to the outer wall at the rear end of the motor 306, the outer wall of which is connected to the turntable 402 via a belt drive, the inner wall of which is fixedly connected to a rotating shaft 403 located at the upper left end of the first screening frame 303, the front and rear ends of the rotating shaft 403 are rotatably connected to the front and rear inner walls of the screening box 101 respectively, a plurality of annularly distributed fan blades 405 are fixedly connected to the middle outer wall of the rotating shaft 403, a cylindrical protective frame 404 rotatably connected to the outer wall of the rotating shaft 403 is arranged on the outside of the fan blade 405, the interior of the cylindrical protective frame 404 is hollow and openings are arranged on the surface.

[0031] When the dust on the surface of the seeds needs to be processed, it can be achieved by setting up the dust filter component 4. When in use, it cooperates with the screening component 3. The motor 2 306 drives the turntable 1 401 fixedly connected to its output shaft to rotate. The rotation of the turntable 1 401 drives the turntable 2 402 connected to it through the set belt to rotate. The rotation of the turntable 2 402 drives the rotation of the rotating shaft 403 fixedly connected to it. The rotation of the rotating shaft 403 drives the fan blades 405 fixedly connected to the surface to rotate. When the fan blades 405 rotate, the dust on the surface of the seeds can be blown into the dust filter 106, thereby separating the seeds from the dust.

[0032] The working principle of the seed screening device for agricultural technology promotion will be described in detail below.

[0033] like Figure 1-5As shown, when in use, first add the seeds to be screened into the outer frame 202 through the feed port 203, then start the fan 210, the heating wire 209 and the switch of the motor 204, and blow the air heated by the heating wire 209 into the outer frame 202 through the fan 210 to properly heat the seeds. At the same time, the motor 204 drives the rotating rod 205 connected thereto to rotate, and the rotation of the rotating rod 205 drives the stirring rod 206 connected thereto to rotate, so as to break up the seeds that are agglomerated due to moisture. The broken seeds fall into the interior of the screening box 101 through the opening 201 set at the top of the screening box 101, which is convenient for the next step of processing.

[0034] When the seeds need to be graded and screened, start motor 2 306, which drives crank 307 connected to its output shaft to rotate. The rotation of crank 307 drives connecting rod 3 308 rotatably connected to it to rotate. The rotation of connecting rod 308 drives the second screening frame 305 rotatably connected to it to vibrate left and right. Since the second screening frame 305 is fixedly connected to the first screening frame 303 on its top through the fixed plate 304, the vibration of the second screening frame 305 will drive the vibration of the first screening frame 303 to avoid clogging the mesh, and the mesh of the first screening frame 303 is larger than the mesh of the second screening frame 305. In this way, the seeds can be graded and screened, and the screened seeds pass through the first unloading plate 107 and the second unloading plate 108 respectively and fall into the designated position.

[0035] When the dust on the surface of the seeds needs to be processed, it can be achieved by setting up the dust filter component 4. When in use, it cooperates with the screening component 3. The motor 2 306 drives the turntable 1 401 fixedly connected to its output shaft to rotate. The rotation of the turntable 1 401 drives the turntable 2 402 connected to it through the set belt. The rotation of the turntable 2 402 drives the rotation of the rotating shaft 403 fixedly connected to it. The rotation of the rotating shaft 403 drives the fan blades 405 fixedly connected to the surface to rotate. When the fan blades 405 rotate, the dust on the surface of the seeds can be blown into the dust filter 106, thereby separating the seeds from the dust.

[0036] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A seed screening device for agricultural technology promotion, comprising a screening box (101), characterized in that: The four corners of the bottom of the screening box (101) are fixedly connected with supporting legs (102); a control panel (103) is provided at the upper left corner of the front side wall of the screening box (101); a dust collecting drawer (104) is slidably connected to the inner bottom of the screening box (101); a handle (105) is provided on the front side wall of the dust collecting drawer (104); a dust filter hopper (106) connected to the inside of the screening box (101) is provided on the right side wall of the screening box (101); a first unloading plate (107) is inserted and fixedly connected to the left side of the screening box (101); a second unloading plate (108) is inserted and fixedly connected to the right side of the screening box (101); an anti-agglomeration component (2) is fixedly connected to the top of the screening box (101); and a screening component (3) and a dust filter component (4) are provided inside the screening box (101).

2. The seed screening device for agricultural technology promotion according to claim 1, characterized in that: The interior of the dust filter hopper (106) is hollow and the outer wall is provided with a mesh for filtering dust. The control panel (103) is electrically connected to the anti-agglomeration component (2) and the screening component (3) inside the screening box (101). The first discharge plate (107) and the second discharge plate (108) are both inclined and the first discharge plate (107) is higher in the vertical direction than the second discharge plate (108).

3. The seed screening device for agricultural technology promotion according to claim 1, characterized in that: The anti-agglomeration component (2) comprises an outer frame (202), the outer frame (202) is hollow inside and the bottom is fixedly connected to the top of the screening box (101), the top of the screening box (101) is provided with an opening (201) located inside the outer frame (202), the top left end of the outer frame (202) is provided with a feed inlet (203), the middle part of the top of the outer frame (202) is fixedly connected to a motor 1 (204), the output end of the motor 1 (204) passes through the inner top wall of the outer frame (202) and is connected to a rotary A rotating rod (205), a plurality of stirring rods (206) are arranged at equal distances on the upper and lower side walls of the rotating rod (205), a hollow bellows (207) is arranged on the right side of the outer frame (202), a vent (208) is opened on the right side wall of the bellows (207), a heating wire (209) is fixedly connected to the upper and lower inner walls of the bellows (207), a fan (210) connected to the inside of the outer frame (202) is arranged on the left side of the bellows (207), and a filter is arranged on the left side of the fan (210).

4. The seed screening device for agricultural technology promotion according to claim 1, characterized in that: The screening component (3) comprises a second motor (306) and four connecting rods (301), the tops of the four connecting rods (301) are rotatably connected to connecting blocks fixed at the four corners of the top wall of the screening box (101), the bottoms of the four connecting rods (301) are rotatably connected to the second connecting rod (302), the bottoms of the four connecting rods (302) are rotatably connected to the triangular fixed blocks (309), the front and rear opposite sides of the four triangular fixed blocks (309) are fixedly connected to the first screening frame (303), the front and rear side walls of the first screening frame (303) are fixedly connected to a plurality of front-to-back symmetrical fixed plates (304), the front and rear opposite sides of the plurality of fixed plates (304) are fixedly connected to the first screening frame (303), and the front and rear opposite sides of the plurality of fixed plates (304) are fixedly connected to the first screening frame (303). A second screening frame (305) is fixedly connected to the lower side end, the front side wall of the second motor (306) is fixedly connected to the rear outer wall of the screening box (101), the output shaft of the second motor (306) passes through the rear inner wall of the screening box (101) and the end is rotatably connected to the front inner wall of the screening box (101), the output end shaft of the second motor (306) is located at the lower left end of the second screening frame (305) and the middle outer wall is fixedly connected to a crank (307), the right end of the crank (307) is rotatably connected to a connecting rod three (308), and the end of the connecting rod three (308) away from the crank (307) is rotatably connected to a raised block at the bottom of the right end of the second screening frame (305).

5. The seed screening device for agricultural technology promotion according to claim 4, characterized in that: The first screening box (303) and the second screening box (305) are both inclined, the mesh at the top of the first screening box (303) is larger than the mesh at the top of the second screening box (305), and the lower ends of the unsealed sides of the first screening box (303) and the second screening box (305) are higher than the first blanking plate (107) and the second blanking plate (108).

6. The seed screening device for agricultural technology promotion according to claim 5, characterized in that: The dust filter assembly (4) comprises a turntable 1 (401), the inner wall of which is fixedly connected to the outer wall at the rear end of the motor 2 (306), the outer wall of which is connected to the turntable 2 (402) via a belt drive, the inner wall of which is fixedly connected to a rotating shaft (403) located at the upper left end of the first screening frame (303), the front and rear ends of which are rotatably connected to the front and rear inner walls of the screening box (101), the middle outer wall of which is fixedly connected to a plurality of annularly distributed fan blades (405), the outer part of which is provided with a cylindrical protective frame (404) rotatably connected to the outer wall of the rotating shaft (403), the inner part of which is hollow and the surface of which is provided with openings.