CN119187016A

CN119187016A - Seed screening equipment for agricultural technology

Info

Publication number: CN119187016A
Application number: CN202411635273.3A
Authority: CN
Inventors: 李靖; 李万发; 梁友
Original assignee: Hubei Chuxu Wanfa Seed Technology Co ltd
Current assignee: Hubei Chuxu Wanfa Seed Technology Co ltd
Priority date: 2024-11-15
Filing date: 2024-11-15
Publication date: 2024-12-27

Abstract

The invention relates to the technical field of building material crushing and screening equipment and discloses seed screening equipment for agricultural technology, which comprises a bottom plate and a screening box arranged at the upper end of the bottom plate, wherein the upper end of the screening box is provided with a feed inlet and an anti-blocking component positioned in the feed inlet, an inner cavity is provided with a first screening mechanism, a second screening mechanism and a material collecting component, the bottom of the inner cavity is provided with a waste collecting component, the first screening mechanism comprises a first screen plate, a first motor, a rotating rod, a ventilating duct, a fan, a dehumidifying port and two fixing plates, the first screen plate is horizontally arranged in the screening box, the first motor is arranged on the left side wall of the screening box, the output end of the first motor is connected with the rotating rod, and the two fixing plates are symmetrically arranged on the inner wall of the screening box front and back. The invention has the advantages and effects that the light impurities can be removed, the seeds can be screened while being dried, and the seeds with different specifications can be screened.

Description

Seed screening equipment for agricultural technology

Technical Field

The invention relates to the technical field of seed screening equipment, in particular to seed screening equipment for agricultural technology.

Background

The agricultural technology is the first driving force of agricultural development, wherein the agricultural technology plays a great role, so as to strengthen the popularization of the agricultural technology, promote the agricultural scientific research result and the practical technology to be applied to agricultural production as soon as possible, ensure the development of agriculture, realize the modernization of agriculture, formulate the present method, and need to use seed screening equipment in the agricultural technology at present.

At present, the screening mode of the seed screening device is relatively simple, mainly the screening is carried out according to the particle size, the broken stone fine sand and other impurities are filtered, but the impurities cannot be effectively removed from some seed coats, the seeds cannot be dried simultaneously in the screening process, the screening effect of the seeds with moisture is not ideal, the seeds with different specifications cannot be screened, and the screening effect is poor, so that the seed screening device for agricultural technology is necessary to solve the problems.

Disclosure of Invention

The invention aims to provide seed screening equipment for agricultural technology, which has the effects of removing light impurities, screening seeds while drying the seeds and screening seeds with different specifications.

The seed screening device for the agricultural technology comprises a bottom plate and a screening box arranged at the upper end of the bottom plate, wherein a feed inlet and an anti-blocking part positioned in the feed inlet are arranged at the upper end of the screening box, a first screening mechanism, a second screening mechanism and a receiving component are arranged in an inner cavity, a waste collecting part is arranged at the bottom of the inner cavity, the first screening mechanism comprises a first screen plate, a first motor, a rotating rod, a ventilating duct, a fan, a dehumidifying opening and two fixing plates, the first screen plate is horizontally arranged in the screening box, the first motor is arranged on the left side wall of the screening box, the output end of the first motor is connected with the rotating rod, the two fixing plates are symmetrically arranged on the inner wall of the screening box in a front-back mode, a plurality of first springs connected with the first screen plate are arranged at the upper end of the fixing plates at equal intervals, two cams pushing the first screen plate downwards are arranged outside the rotating rod, a synchronous belt structure is arranged between the fan and the end part of the rotating rod, heating wires are further arranged in the ventilating duct, and the dehumidifying opening and the ventilating duct are arranged in the ventilating duct.

Through adopting above-mentioned technical scheme, enter into screening incasement with the seed from the feed inlet, prevent stifled part messenger seed can be smooth whereabouts, can screen it through first screening mechanism and second screening mechanism, can screen out light impurity and grit, simultaneously can also screen the seed of different specifications, at last retrieve the seed through receiving material subassembly, waste collection part is used for concentrating and handles grit waste material, specifically when through first screening mechanism, rotatory by first motor drive bull stick, push down first sieve through the cam intermittent type formula, make it be close to the fixed plate and extrude the first spring of bottom, under the flexible of first spring, make first sieve constantly reciprocate vibrations, preliminary screening is carried out to the seed, simultaneously drive the fan through the hold-in range structure and rotate, the air current that its produced enters into the screening incasement after the heater strip heating, hot-blast can carry out the stoving to the seed that plays and handle, can also blow impurity such as light seed skin to the left side simultaneously, moisture that will produce by the exhaust fan and light impurity discharge, make the quality of seed screening better, the hold-in range structure includes setting up at the hold-in range between two synchronous belt end connection.

The anti-blocking component comprises a second motor arranged at the rear side of the screening box, a driving rod is arranged at the output end of the second motor, and a plurality of stirring blades are arranged on the outer circumference of the driving rod.

Through adopting above-mentioned technical scheme, rotate the actuating lever by the second motor, drive stirring leaf rotation, make the whereabouts that the seed can be smooth carry out screening treatment on the first sieve.

The screening device is further characterized in that the second screening mechanism comprises a second screen plate and a shaking component, the second screen plate is arranged below the first screen plate in parallel, the shaking component is used for controlling the second screen plate to vibrate, and the left side and the right side of the second screen plate are respectively provided with a material blocking structure.

Through adopting above-mentioned technical scheme, first sieve leaves bulky seed in top, and small-volume seed and fine sand fall on the second sieve, shake the part through shaking it constantly, make fine sand whereabouts, and small-volume seed remains on the second sieve, keeps off the setting of material structure and avoids screening in-process, and the seed falls from both sides.

The screening box is characterized in that the material blocking structure comprises a material blocking frame which is arranged on the side wall of the screening box in a sliding mode, and a plurality of second springs which are connected with the inner wall of the screening box are arranged on the inner side of the material blocking frame.

Through adopting above-mentioned technical scheme, when rocking about the second sieve, can push out the fender work or material rest, make the second spring compression, keep off the work or material rest and laminating with second sieve tip all the time, avoid the seed to fall from both sides.

The vibrating component comprises a double-shaft motor and a vibrating frame which are arranged below the second sieve plate, push rods are arranged at the output ends of the two sides of the double-shaft motor, push wheels are arranged at the other ends of the push rods, a connecting plate connected with the second sieve plate is arranged at the upper end of the double-shaft motor, and two fixing strips which are arranged right below the push wheels are arranged at the bottom of an inner cavity of the sieving box.

Through adopting above-mentioned technical scheme, the push rod of driving both sides by biax motor rotates, drives the push wheel rotation of tip for biax motor and connecting plate constantly shake from top to bottom under the cooperation of fixed strip, thereby drive the second screening vibrations of upper end, carry out the screening.

The vibration frame is further provided with two guide rods symmetrically arranged at the left end and the right end of the inner side of the vibration frame, guide blocks which are matched with the guide rods in a sliding manner are arranged on the left side wall and the right side wall of the double-shaft motor, and two third springs which are in butt joint with the guide blocks are sleeved on the outer sides of the guide rods.

Through adopting above-mentioned technical scheme, at biax motor and connecting plate reciprocal in-process from top to bottom, two guide blocks of tip are in the guide bar and slide all the time, through the flexible extrusion of third spring for the second sieve vibrations effect is better.

The vibrating frame is further provided with two limiting rods which are connected with the screening box in a sliding mode on the left side wall and the right side wall of the vibrating frame, a stop block is arranged between the other ends of the upper limiting rod and the lower limiting rod, and a fourth spring is sleeved on the part, located in the screening box, of the limiting rods.

Through adopting above-mentioned technical scheme, still can drive its side-to-side movement when pushing away wheel and fixed strip complex for vibrations frame drive gag lever post removes, under the extrusion buffering of fourth spring, makes its whole can produce and control and rock, and the second sieve shakes about and in the time of shaking from top to bottom, makes its screening effect better.

The material collecting assembly comprises a rectangular frame arranged on the outer walls of the first sieve plate and the second sieve plate, one ends of the first sieve plate and the second sieve plate are hinged with the rectangular frame, supporting blocks are arranged on the inner side of the rectangular frame, two first electric push rods connected with the first sieve plate are arranged at the front end of the bottom of the rectangular frame and positioned at the upper end, and four telescopic rods are arranged between the first sieve plate and the second sieve plate.

Through adopting above-mentioned technical scheme, after screening finishes, drive first electricity push rod, make the first sieve slope of upper end to drive the second sieve slope of lower extreme through telescopic link, thereby pour the seed on the sieve and collect.

The telescopic rod piece is further arranged in a way that the telescopic rod piece comprises connecting columns arranged on one side opposite to the first sieve plate and the second sieve plate, limiting sleeves are sleeved on the outer sides of the end parts of the two connecting columns in a sliding mode, four sliding blocks which are in sliding fit with the connecting columns are arranged at one end, extending into the limiting sleeves, of the connecting columns, and two discharge holes and a material receiving bin positioned at the discharge holes are arranged at the front end of the screening box.

By adopting the technical scheme, in the process of inclining the first sieve plate, the connecting column at the upper end is driven to move upwards, and under the cooperation of the limiting sleeve and the sliding block, the connecting column at the lower end drives the second sieve plate at the bottom to incline, so that seeds on the sieve plate are poured into the corresponding receiving bin for collection.

The invention is further arranged that the waste collection component comprises two second electric push rods arranged at the rear end of the screening box, a material receiving box is arranged between the output ends of the two second electric push rods, and a movable wheel is arranged at the bottom of the material receiving box.

Through adopting above-mentioned technical scheme, at the in-process of screening seed, the grit crushed aggregates of production falls into to receive in the workbin, and the cooperation of rethread second electricity push rod and removal wheel is released it to the convenience is cleared up it.

The beneficial effects of the invention are as follows:

1. According to the invention, the first motor drives the rotating rod to rotate, the first sieve plate is pushed down in an intermittent manner through the cam, the first sieve plate is close to the fixed plate and extrudes the first spring at the bottom, the first sieve plate continuously vibrates up and down in a reciprocating manner under the expansion and contraction of the first spring, the seeds are primarily screened, meanwhile, the fan is driven to rotate through the synchronous belt structure, the generated air flow is heated by the heating wire and then enters the screening box, the hot air can dry the thrown seeds, meanwhile, impurities such as light seed coats and the like can be blown to the left side, and the generated moisture and light impurities are discharged by the exhaust fan, so that the screening quality of the seeds is better.

2. According to the invention, the push rods at two sides are driven by the double-shaft motor to rotate, the push wheels at the end parts are driven to rotate, and the double-shaft motor and the connecting plate continuously vibrate up and down under the cooperation of the fixing strips, so that the second screening vibration at the upper end is driven, the push wheels are driven to move left and right while being matched with the fixing strips, the vibration frame drives the limit rod to move, the whole of the device can shake left and right under the extrusion buffering of the fourth spring, the second screen plate vibrates up and down and shakes left and right, the screening effect is better, the device can screen seeds with different specifications, and the applicability is stronger.

3. According to the invention, after screening is finished, the first electric push rod is driven, so that the first screen plate at the upper end is inclined, the connecting column at the upper end is driven to move upwards, and the connecting column at the lower end drives the second screen plate at the bottom to also incline under the cooperation of the limiting sleeve and the sliding block, so that seeds on the screen plates are poured into the corresponding receiving bin for collection, and the device is more convenient to use.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an overall construction diagram of a seed screening apparatus for agricultural technology according to the present invention.

Fig. 2 is an internal structural view of the screening box of fig. 1 according to the present invention.

Fig. 3 is a block diagram of the first screening mechanism of fig. 2 according to the present invention.

Fig. 4 is an overall construction diagram of the first screening deck of fig. 3 according to the present invention.

Fig. 5 is a block diagram of the second screening mechanism of fig. 3 according to the present invention.

Fig. 6 is a block diagram of the wobble member of fig. 5 according to the present invention.

Fig. 7 is a structural view of the telescopic link of fig. 4 according to the present invention.

FIG. 8 is a block diagram of the waste collection device of FIG. 1 in accordance with the present invention.

1, Bottom plate, 2, screening box, 3, feed inlet, 31, second motor, 32, driving rod, 33, stirring blade, 4, first screening mechanism, 41, first screening plate, 42, first motor, 43, rotating rod, 44, exhaust cylinder, 45, fan, 46, dehumidification port, 47, fixing plate, 48, first spring, 49, cam, 410, synchronous belt structure, 411, heating wire, 412, exhaust fan, 413, grille, 5, second screening mechanism, 51, second screening plate, 52, material blocking frame, 53, second spring, 54, double-shaft motor, 55, vibration frame, 56, push rod, 57, push wheel, 58, connecting plate, 59, fixing strip, 510, guide rod, 511, guide block, 512, third spring, 513, limit rod, 514, stopper, 515, fourth spring, 6, material receiving component, 61, rectangular frame, 62, support block, 63, first electric push rod, 64, connecting column, 65, limit sleeve, 66, sliding block, 67, 7, receiving part, 71, second push rod, 72, waste material collecting part, and material collecting box.

Detailed Description

The technical scheme of the present invention will be clearly and completely described in connection with specific embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.

As shown in fig. 1, fig. 2, fig. 3 and fig. 4, a seed screening device for agricultural technology comprises a bottom plate 1 and a screening box 2 arranged at the upper end of the bottom plate 1, wherein the upper end of the screening box 2 is provided with a feed inlet 3 and anti-blocking components positioned in the feed inlet 3, an inner cavity is provided with a first screening mechanism 4, a second screening mechanism 5 and a material collecting component 6, the bottom of the inner cavity is provided with a waste collecting component 7, the first screening mechanism 4 comprises a first screen plate 41, a first motor 42, a rotating rod 43, an exhaust cylinder 44, a fan 45, a dehumidifying outlet 46 and two fixing plates 47, the first screen plate 41 is horizontally arranged in the screening box 2, the first motor 42 is arranged on the left side wall of the screening box 2, the output end of the first motor is connected with the rotating rod 43, the two fixing plates 47 are arranged on the inner wall of the screening box 2 in a front-back symmetrical manner, the upper end of the fixing plate 47 is equidistantly provided with a plurality of first springs 48 connected with the first screen plate 41, the outer part of the rotating rod 43 is provided with two cams 49 pushing down the first screen plate 41, the fan 45 and the end part of the fan 43 is provided with a synchronous wire-drying grid 410, and the exhaust cylinder 412 is arranged in the heating cylinder 413.

The seeds enter the screening box 2 from the feed inlet 3, the anti-blocking component enables the seeds to smoothly fall, the seeds can be screened through the first screening mechanism 4 and the second screening mechanism 5, light impurities and sand can be screened out, seeds with different specifications can be screened out simultaneously, finally, the seeds are recovered through the material collecting component 6, the waste collecting component 7 is used for intensively treating sand and stone waste, particularly, when the seeds pass through the first screening mechanism 4, the first motor 42 drives the rotating rod 43 to rotate, the first screen plate 41 is pushed down in an intermittent manner through the cam 49, the seeds are enabled to approach the fixed plate 47 and press the first spring 48 at the bottom, the first screen plate 41 continuously vibrates in a reciprocating manner under the expansion and contraction of the first spring 48, the seeds are primarily screened out, meanwhile, the fan 45 is driven to rotate through the synchronous belt structure 410, the generated air flow enters the screening box 2 after being heated by the heating wire 411, the impurities such as light seed skin and the like can be blown to the left side impurities simultaneously, the generated moisture and the light impurities are discharged through the exhaust fan 412, and the generated moisture and the light impurities are better screened out through the synchronous belt structure, and the synchronous belt structure is arranged between the two synchronous belt 45 and the synchronous belt 45 is connected with the synchronous belt structure 45.

As shown in fig. 1 and 2, the anti-blocking component comprises a second motor 31 installed at the rear side of the screening box 2, a driving rod 32 is installed at the output end of the second motor 31, a plurality of stirring blades 33 are arranged on the outer circumference of the driving rod 32, the driving rod 32 is rotated by the second motor 31 to drive the stirring blades 33 to rotate, so that seeds can smoothly fall onto the first screen plate 41 for screening treatment.

As shown in fig. 3, 5 and 6, the second screening mechanism 5 includes a second screen plate 51 disposed below the first screen plate 41 in parallel and a shaking component for controlling the second screen plate 51 to vibrate, the left and right sides of the second screen plate 51 are respectively provided with a material blocking structure, the material blocking structure includes a material blocking frame 52 slidably disposed on the side wall of the screening box 2, and a plurality of second springs 53 connected with the inner wall of the screening box 2 are mounted on the inner side of the material blocking frame 52.

The first sieve plate 41 is used for retaining large-volume seeds above, small-volume seeds and fine sand fall onto the second sieve plate 51, the small-volume seeds and the fine sand fall onto the second sieve plate 51 by shaking the parts, the fine sand falls down, the small-volume seeds are retained on the second sieve plate 51, the setting of the material blocking structure avoids the screening process, the seeds fall down from two sides, and particularly when the second sieve plate 51 shakes left and right, the material blocking frame 52 can be pushed outwards, the second spring 53 is compressed, the material blocking frame 52 is always attached to the end part of the second sieve plate 51, and the seeds are prevented from falling down from two sides.

As shown in fig. 6, the shaking component includes a dual-shaft motor 54 and a shaking frame 55 disposed below the second screen plate 51, push rods 56 are mounted at output ends of two sides of the dual-shaft motor 54, push wheels 57 are mounted at the other ends of the push rods 56, a connecting plate 58 connected with the second screen plate 51 is mounted at an upper end of the dual-shaft motor 54, two fixing bars 59 located right below the push wheels 57 are disposed at bottoms of an inner cavity of the screening box 2, two guide rods 510 are symmetrically mounted at left and right ends of an inner side of the shaking frame 55, guide blocks 511 slidably fitted with the guide rods 510 are mounted at left and right side walls of the dual-shaft motor 54, two third springs 512 abutting against the guide blocks 511 are sleeved at outer sides of the guide rods 510, two limit rods 513 slidably connected with the screening box 2 are mounted at left and right side walls of the shaking frame 55, a stop block 514 is mounted between the other ends of the upper and lower limit rods 513, and a fourth spring 515 is sleeved at a portion located in the screening box 2.

The push rods 56 on two sides are driven by the double-shaft motor 54 to rotate, the push wheels 57 on the end portions are driven to rotate, under the cooperation of the fixing strips 59, the double-shaft motor 54 and the connecting plates 58 continuously vibrate up and down, so that the second screening plate 51 at the upper end is driven to vibrate, screening is performed, in the process that the double-shaft motor 54 and the connecting plates 58 reciprocate up and down, the two guide blocks 511 on the end portions are always positioned on the guide rods 510 and slide, the second screening plate 51 is enabled to vibrate better through telescopic extrusion of the third springs 512, the push wheels 57 and the fixing strips 59 are matched and simultaneously drive the push wheels to move left and right, the vibration frame 55 drives the limiting rods 513 to move, and under the extrusion buffering of the fourth springs 515, the whole second screening plate 51 can shake left and right while vibrating up and down, and the screening effect is enabled to be better.

As shown in fig. 1, fig. 4, and fig. 7, the material receiving assembly 6 includes a rectangular frame 61 disposed on the outer walls of the first screen plate 41 and the second screen plate 51, one ends of the first screen plate 41 and the second screen plate 51 are hinged to the rectangular frame 61, a supporting block 62 is disposed on the inner side of the rectangular frame 61, two first electric push rods 63 connected to the first screen plate 41 are mounted on the front end of the bottom of the rectangular frame 61 and located at the upper end, four telescopic rods are disposed between the first screen plate 41 and the second screen plate 51, each telescopic rod includes a connecting column 64 mounted on one side opposite to the first screen plate 41 and the second screen plate 51, a limit sleeve 65 is disposed on the outer side sliding sleeve of the end of each connecting column 64, four sliding blocks 66 slidably matched with each connecting column 64 are disposed on one end extending into the limit sleeve 65, and two discharge ports and a material receiving bin 67 located at the discharge port are disposed on the front end of the screening box 2.

After screening, the first electric push rod 63 is driven to incline the first screen plate 41 at the upper end, and the second screen plate 51 at the lower end is driven to incline by the telescopic rod, so that seeds on the screen plates are poured out and collected, in the process of inclining the first screen plate 41, the connecting column 64 at the upper end is driven to move upwards, and under the cooperation of the limiting sleeve 65 and the sliding block 66, the connecting column 64 at the lower end drives the second screen plate 51 at the bottom to incline, so that seeds on the screen plates are poured into the corresponding receiving bin 67 for collection.

As shown in fig. 8, the waste collection unit 7 includes two second electric push rods 71 disposed at the rear end of the screening box 2, a material receiving box 72 is disposed between the output ends of the two second electric push rods 71, a moving wheel 73 is disposed at the bottom of the material receiving box 72, and during the process of screening seeds, the generated sand and stone particles fall into the material receiving box 72, and are pushed out by the cooperation of the second electric push rods 71 and the moving wheel 73, so that the sand and stone particles are cleaned conveniently.

Claims

1. The seed screening equipment for agricultural technology comprises a bottom plate (1) and a screening box (2) arranged at the upper end of the bottom plate (1), and is characterized in that the upper end of the screening box (2) is provided with a feed inlet (3) and anti-blocking parts positioned in the feed inlet (3), an inner cavity is provided with a first screening mechanism (4), a second screening mechanism (5) and a receiving component (6), the bottom of the inner cavity is provided with a waste collecting part (7), the first screening mechanism (4) comprises a first screen plate (41), a first motor (42), a rotating rod (43), an exhaust cylinder (44), a fan (45), a dehumidifying port (46) and two fixing plates (47), the first screen plate (41) is horizontally arranged in the screening box (2), the first motor (42) is arranged on the left side wall of the screening box (2) and the output end of the screening box is connected with a rotating rod (43), the two fixing plates (47) are arranged on the inner wall of the screening box (2) in a front-back symmetrical mode, the upper end of the fixing plate (4) is provided with a plurality of first screen plates (41) which are connected with one another, the first screen plates (43) are arranged at equal intervals, the first screen plates (43) are arranged between the two fan (45) and the end portions (43) of the first screen plate (41) are provided with a synchronous structure (43), the exhaust cylinder (44) is internally provided with a heating wire (411), and the dehumidifying port (46) is internally provided with an exhaust fan (412) and a grid (413).

2. The seed screening device for agricultural technology according to claim 1, wherein the anti-blocking member comprises a second motor (31) mounted at the rear side of the screening box (2), a driving rod (32) is mounted at the output end of the second motor (31), and a plurality of stirring blades (33) are arranged on the outer circumference of the driving rod (32).

3. The seed screening device for agricultural technology according to claim 1, wherein the second screening mechanism (5) comprises a second screen plate (51) arranged below the first screen plate (41) in parallel and a shaking component for controlling the shaking of the second screen plate (51), and the left side and the right side of the second screen plate (51) are provided with material blocking structures.

4. The seed screening device for agricultural technologies according to claim 3, wherein the material blocking structure comprises a material blocking frame (52) slidably arranged on the side wall of the screening box (2), and a plurality of second springs (53) connected with the inner wall of the screening box (2) are installed on the inner side of the material blocking frame (52).

5. The seed screening device for agricultural technologies according to claim 4, wherein the shaking component comprises a double-shaft motor (54) and a shaking frame (55) which are arranged below the second screen plate (51), push rods (56) are arranged at output ends of two sides of the double-shaft motor (54), push wheels (57) are arranged at the other ends of the push rods (56), a connecting plate (58) connected with the second screen plate (51) is arranged at the upper end of the double-shaft motor (54), and two fixing strips (59) which are arranged right below the push wheels (57) are arranged at the bottom of an inner cavity of the screening box (2).

6. The seed screening device for agricultural technologies according to claim 5, wherein two guide rods (510) are symmetrically arranged at the left end and the right end of the inner side of the vibration frame (55), guide blocks (511) which are in sliding fit with the guide rods (510) are arranged at the left side wall and the right side wall of the double-shaft motor (54), and two third springs (512) which are in abutting connection with the guide blocks (511) are sleeved on the outer sides of the guide rods (510).

7. The seed screening device for agricultural technologies according to claim 6, wherein two limiting rods (513) which are slidably connected with the screening box (2) are mounted on the left and right side walls of the vibration frame (55), a stop block (514) is mounted between the other ends of the upper limiting rod and the lower limiting rod (513), and a fourth spring (515) is sleeved on the part of the limiting rod (513) located in the screening box (2).

8. The seed screening device for agricultural technologies according to claim 7, wherein the material collecting assembly (6) comprises a rectangular frame (61) arranged on the outer walls of the first screen plate (41) and the second screen plate (51), one ends of the first screen plate (41) and the second screen plate (51) are hinged with the rectangular frame (61), supporting blocks (62) are arranged on the inner side of the rectangular frame (61), two first electric pushing rods (63) connected with the first screen plate (41) are arranged at the front end of the bottom of the rectangular frame (61) at the upper end, and four telescopic rods are arranged between the first screen plate (41) and the second screen plate (51).

9. The seed screening device for agricultural technologies according to claim 8, wherein the telescopic rod comprises connecting columns (64) arranged on opposite sides of the first screen plate (41) and the second screen plate (51), limiting sleeves (65) are sleeved on the outer sides of the end parts of the two connecting columns (64) in a sliding mode, four sliding blocks (66) which are in sliding fit with the connecting columns (64) are arranged at one ends of the connecting columns (64) extending into the limiting sleeves (65), and two discharge holes and a receiving bin (67) located at the discharge holes are arranged at the front end of the screening box (2).

10. The seed screening device for agricultural technologies according to claim 9, wherein the waste collection part (7) comprises two second electric pushing rods (71) arranged at the rear end of the screening box (2), a material receiving box (72) is arranged between the output ends of the two second electric pushing rods (71), and a moving wheel (73) is arranged at the bottom of the material receiving box (72).