CN214391117U - Seed sieving mechanism for farming - Google Patents

Abstract

The utility model discloses a seed sieving mechanism for farming, include: the screening mechanism comprises an underframe, a screening box with an opening at the top, a screen and a vibrating motor, wherein four corners at the bottom end of the screening box are connected with four corners at the top end of the underframe through first springs respectively, and the screen is obliquely and detachably arranged in an inner cavity of the screening box; the impurity removing mechanism is positioned at the top of the higher end of the screen, and comprises an outer cylinder, an inner cylinder with an upper opening and a lower opening, an impurity removing cover, an induced draft fan and a collecting box, wherein the outer cylinder is detachably arranged at the top end of the screen box, and the inner cylinder is detachably arranged in the middle of the outer cylinder in a penetrating manner; the feeding hopper is detachably arranged at the top end of the outer barrel, the bottom of the feeding hopper is inserted at the top of the inner cavity of the inner barrel, and the bottom of the inner cavity of the feeding hopper is also provided with a flow regulating mechanism; the winnowing mechanism comprises a winnowing box and an air blower. The utility model discloses aim at solving current seed sieving mechanism and can not collect light impurity such as dust, the poor problem of commonality.

Description

Seed sieving mechanism for farming

Technical Field

The utility model relates to an agricultural planting technical field especially relates to a seed sieving mechanism for agricultural planting.

Background

Agricultural planting is one of the main components of agriculture, namely plant cultivation, grain, non-staple food, feed, industrial raw materials and the like are obtained by utilizing the living functions of plants through artificial cultivation, and the cultivation of various crops, woods, fruit trees, medicinal plants, ornamental plants and the like is included. Crops obtained by agricultural planting mainly include grain crops, cash crops, vegetable crops, green manure crops, feed crops, pasture, flowers and other horticultural crops. Seeds are the unique propagules of gymnosperms and angiosperms, which are formed by the ovule undergoing pollination fertilization. The seed plants are developed and grown from seeds, so that the seeds need to be sown firstly, and after the seeds germinate and grow into seedlings, the seedlings are transplanted and cultivated. The seeds contain some light impurities such as dust and straw powder, small-particle seeds and shrivelled seeds, so that the seeds need to be screened before sowing the seeds to remove the light impurities such as dust and straw powder, the small-particle seeds and the shrivelled seeds in order to improve the quality and the survival rate of the seeds.

In the prior art, the seed screening device for agricultural planting has the following problems that firstly, light impurities such as dust, straw powder and the like cannot be well collected during screening, so that the light impurities are easy to float in the air to cause environmental pollution; secondly, the universality is poor, and different varieties of seeds with different particle sizes cannot be screened; thirdly, the seed screening effect is poor.

To above technical problem, the utility model discloses a seed sieving mechanism for farming, the utility model has the advantages of can collect light impurity such as dust, the garrulous end of straw that contain in the seed, reduce environmental pollution, can filter the seed of different cultivars, the commonality is strong, the effectual of screening.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a seed sieving mechanism for farming to solve among the prior art seed sieving mechanism for farming can not be fine when the screening collect light impurity such as dust, straw bits and pieces, thereby, these light impurity fly away easily in the air and cause environmental pollution, the commonality is poor, can not filter the seed of the different varieties that have different particle diameters, the technical problem such as the effect of screening is relatively poor, the utility model has the advantages of can collect light impurity such as dust, straw bits and pieces that contain in the seed, reduce environmental pollution, can filter the seed of different varieties, the commonality is strong, the effectual of screening.

The utility model discloses a following technical scheme realizes: the utility model discloses a seed sieving mechanism for farming, include:

the screening mechanism comprises an underframe, a screen box with an opening at the top, a screen and a vibrating motor, wherein four corners at the bottom end of the screen box are respectively connected with four corners at the top end of the underframe through first springs;

the impurity removing mechanism is positioned at the top of one end with a higher screen mesh and comprises an outer barrel, an inner barrel with an upper opening and a lower opening, an impurity removing cover, an induced draft fan and a collecting box, the outer barrel is detachably mounted at the top end of a screen box, the inner barrel is detachably arranged in the middle of the outer barrel in a penetrating mode, the upper end and the lower end of the inner barrel respectively exceed the upper end and the lower end of the outer barrel, filter holes are formed in the outer wall of the part, located in the inner cavity of the outer barrel, of the inner barrel at intervals, guide plates which are inclined downwards are arranged on the inner walls of the two sides of the inner barrel at intervals in a staggered mode, the impurity removing cover is arranged on the inner wall of the outer barrel at intervals, cover openings of the impurity removing cover face towards the inner barrel respectively, the impurity removing cover is connected with the impurity removing pipe, the impurity removing pipe penetrates through the side wall of the outer barrel and is connected with an induced draft pipe, the induced draft pipe is connected with an air outlet of the induced draft fan, an air outlet of the collecting box is connected with the collecting box, and the collecting box is arranged on the side part of the screening mechanism;

the feeding hopper is detachably arranged at the top end of the outer barrel, the bottom of the feeding hopper is inserted at the top of the inner cavity of the inner barrel, and the bottom of the inner cavity of the feeding hopper is also provided with a flow regulating mechanism;

winnowing mechanism, winnowing mechanism includes winnowing box and air-blower, the winnowing box is located the lateral part of guide fill, the top of winnowing box is provided with and connects the hopper, it is located under the guide fill to connect the hopper, the bottom of winnowing box is provided with third discharge gate and fourth discharge gate, the third discharge gate corresponds with connecing the hopper position, the fourth discharge gate is located the lateral part of third discharge gate, be provided with the air intake on the lateral wall of winnowing box, the air intake is located and connects between hopper and the third discharge gate, and the third discharge gate is located between air intake and the fourth discharge gate, the air intake passes through the blast pipe with the tuyere of air-blower and is connected.

Preferably, in order to facilitate the installation and the disassembly of the screen mesh, the front inner wall and the rear inner wall of the screen box are respectively provided with support blocks at opposite positions and intervals, the front end and the rear end of the screen mesh are respectively positioned at the top ends of the support blocks, the top ends of the support blocks are provided with studs, the front end and the rear end of the screen mesh are respectively provided with through holes corresponding to the studs, and the top ends of the studs upwards penetrate through the through holes and are connected with first nuts in a threaded manner.

Preferably, in order to adjust the flow of the seeds which slide up and down in the screening process, the top of the screen mesh is provided with flow limiting plates at intervals, the front end and the rear end of each flow limiting plate are respectively provided with a short shaft, the front side wall and the rear side wall of the screen box are respectively provided with shaft holes corresponding to the short shafts, the short shafts are tightly inserted into the shaft holes and can rotate in the shaft holes, and the outer end part of one short shaft is provided with a first rotating wheel.

Preferably, in order to facilitate the installation and the disassembly of the outer cylinder, the front end and the rear end of the bottom of the outer cylinder are respectively provided with an ear plate, the front end and the rear end of the top of the screen box are respectively provided with a guide pillar corresponding to the ear plate, the ear plate is respectively provided with a guide hole corresponding to the guide pillar, the top of the guide pillar upwards penetrates through the guide hole and is screwed with a second nut, the middle part of the guide pillar is sleeved with a second spring, and the second spring is positioned between the screen box and the ear plate.

Preferably, in order to facilitate the installation and the disassembly of the inner cylinder, a baffle is fixedly sleeved on the periphery of the top of the inner cylinder and positioned on the upper part of the outer cylinder, a limiting plate is screwed on the periphery of the bottom of the inner cylinder, and the limiting plate is positioned on the lower part of the outer cylinder.

Preferably, in order to facilitate the installation and the disassembly of the loading hopper, the top end of the outer barrel is provided with plug bushes at intervals, the bottom end of the loading hopper is provided with plug posts corresponding to the plug bushes, and the bottoms of the plug posts are fixedly plugged in the plug bushes.

Preferably, in order to facilitate the flow to getting into the seed in the inner tube to adjust, flow control mechanism includes the fixed plate, flow control plate and adjusting screw, fixed plate fixed mounting is between the front and back inner wall of loading hopper, flow control plate is the "infundibulate" of invering, and flow control plate is located the lower part of fixed plate, the vertical middle part that sets up at the loading hopper inner chamber of adjusting screw, and adjusting screw and fixed plate spiro union, fixed plate and flow control plate fixed connection are passed to adjusting screw's bottom, adjusting screw's top is provided with the second runner.

Preferably, in order to facilitate the discharge of the small-particle seeds from the second discharge hole, the bottom end of the sieve box is in a funnel shape.

The utility model has the advantages of it is following:

(1) in the utility model, the top of the screening mechanism is provided with the impurity removing mechanism, when the seeds pass through the impurity removing mechanism, the light impurities such as dust, straw powder and the like contained in the seeds are sucked into the collecting box through the draught fan, so that the light impurities are prevented from floating in the air to cause environmental pollution when the seeds are screened;

(2) in the utility model, the screen mesh can be detachably arranged in the inner cavity of the screen box, the outer cylinder can be detachably arranged at the top end of the screen box, the inner cylinder can be detachably arranged at the middle part of the outer cylinder in a penetrating way, and the charging hopper can be detachably arranged at the top end of the outer cylinder, thereby being convenient for replacing the inner cylinder and the screen mesh, when seeds of different varieties need to be replaced, only the screen mesh with different screen mesh apertures and the inner cylinders with different filter hole apertures need to be better, and the universality of the screening device is improved;

(3) in the utility model, the bottom of the inner cavity of the feeding device is provided with a flow regulating mechanism, thereby the flow of seeds falling into the inner cylinder is regulated by the flow regulating mechanism, the inner walls at both sides of the inner cylinder are respectively provided with guide plates which incline downwards in a staggered way at intervals, thereby the falling time of the seeds in the inner cylinder is delayed by the guide plates, and the seeds are fully dispersed, firstly, light impurities such as dust, straw powder and the like contained in the seeds are conveniently absorbed, secondly, the seeds falling onto the screen can be dispersed, the top of the screen is also provided with flow limiting plates at intervals, thereby the seeds are further limited, the seeds can not be piled together, thereby small particle seeds contained in the seeds can better fall to the bottom of the screen box through the screen holes on the screen, meanwhile, the seeds entering the winnowing box can be more dispersed, thereby the shriveled seeds contained in the seeds can be winnowed, thereby improving the screening effect of the seeds.

Drawings

FIG. 1 is a front sectional view of the present invention;

FIG. 2 is an enlarged view of the structure at A in FIG. 1;

FIG. 3 is a top view of a screen;

FIG. 4 is a schematic view of a restrictor plate;

FIG. 5 is a front cross-sectional view of the screen box;

FIG. 6 is a side sectional view of the outer tub and screen box mounting structure;

FIG. 7 is a front sectional view in the direction of the inner and outer cylinder mounting structure;

fig. 8 is a cross-sectional view of a flow regulating mechanism.

In the figure: 1. a screening mechanism; 11. a chassis; 12. a screen box; 121. a shaft hole; 122. a first discharge port; 123. a second discharge port; 124. a guide post; 1241. a second nut; 1242. a second spring; 13. screening a screen; 131. a through hole; 14. a vibration motor; 15. a first spring; 2. a support block; 21. a stud; 3. a first nut; 4. a restrictor plate; 41. a minor axis; 411. a first runner; 5. a material guide hopper; 6. an impurity removal mechanism; 61. an outer cylinder; 611. an ear plate; 6111. a guide hole; 612. inserting a sleeve; 62. an inner barrel; 621. a baffle plate; 622. a limiting plate; 623. a filtration pore; 624. a material guide plate; 63. an impurity removal cover; 64. an induced draft fan; 65. a collection box; 66. an impurity removal pipe; 67. an induced draft pipe; 7. a hopper; 71. inserting a column; 8. a flow rate adjusting mechanism; 81. a fixing plate; 82. a flow regulating plate; 83. adjusting the screw rod; 831. a second runner; 9. a winnowing mechanism; 91. a winnowing box; 911. a receiving hopper; 912. a third discharge port; 913. a fourth discharge port; 914. an air inlet; 92. a blower; 93. a blast pipe.

Detailed Description

The following embodiments of the present invention are described in detail, and the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments, and in the description of the present invention, the terms "front", "back", "left", "right", "longitudinal", "transverse", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for convenience of description of the present invention and simplification of the description, but not for indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention.

Example 1

Embodiment 1 discloses a seed sieving mechanism for agricultural planting, as shown in fig. 1, including:

the screening mechanism 1 comprises an underframe 11, a screening box 12 with an opening at the top, a screen 13 and a vibrating motor 14, wherein four corners at the bottom end of the screening box 12 are connected with four corners at the top end of the underframe 11 through first springs 15 respectively, the screen 13 is obliquely and detachably arranged in an inner cavity of the screening box 12, specifically, as shown in fig. 1 and 2, supporting blocks 2 are arranged on the front inner wall and the rear inner wall of the screening box 12 at opposite positions and intervals respectively, the front end and the rear end of the screen 13 are located at the top ends of the supporting blocks 2 respectively, and studs 21 are arranged at the top ends of the supporting blocks 2; as shown in fig. 1, 2 and 3, through holes 131 are respectively formed at the front end and the rear end of the screen 13 corresponding to the studs 21, the top ends of the studs 21 upwardly penetrate through the through holes 131 and are screwed with first nuts 3, and the top of the screen 13 is provided with flow-limiting plates 4 at intervals; as shown in fig. 4, the front and rear ends of the restrictor plate 4 are respectively provided with short shafts 41; as shown in fig. 5, shaft holes 121 are respectively formed on the front and rear side walls of the screen box 12 opposite to the positions of the stub shafts 41, the stub shafts 41 are tightly inserted into the shaft holes 121, and the stub shafts 41 can rotate in the shaft holes 121, and the outer end of one stub shaft 41 is provided with a first rotating wheel 411; as shown in fig. 1, a first discharge hole 122 is formed in a side wall of the sieve box 12 and is opposite to a lower end of the sieve mesh 13, a material guide hopper 5 is arranged outside the first discharge hole 122, a second discharge hole 123 is formed in a bottom end of the sieve box 12, the vibration motor 14 is arranged at the bottom end of the sieve box 12 and is located at a side portion of the second discharge hole 123, and the bottom end of the sieve box 12 is funnel-shaped;

as shown in fig. 1, 6 and 7, the impurity removing mechanism 6 is located at the top of the higher end of the screen 13, the impurity removing mechanism 6 includes an outer cylinder 61, an inner cylinder 62 with upper and lower openings, an impurity removing cover 63, an induced draft fan 64 and a collecting box 65, the outer cylinder 61 is detachably mounted at the top end of the screen box 12, specifically, the front and rear ends of the bottom of the outer cylinder 61 are respectively provided with an ear plate 611, the front and rear ends of the top of the screen box 12 are respectively provided with a guide pillar 124 corresponding to the ear plate 611, the ear plate 611 is provided with a guide hole 6111 corresponding to the guide pillar 124, the top of the guide pillar 124 upwardly passes through the guide hole 6111 and is screwed with a second nut 1241, the middle part of the guide pillar 124 is sleeved with a second spring 1242, the second spring 1242 is located between the screen box 12 and the ear plate 611, the inner cylinder 62 is detachably inserted in the middle part of the outer cylinder 61, the upper and lower ends of the inner cylinder 62 respectively exceed the upper and lower ends of the outer cylinder 61, specifically, the periphery of the top of the inner cylinder 62 is fixedly sleeved with a baffle 621, the baffle 621 is positioned at the upper part of the outer cylinder 61, the limiting plate 622 is screwed at the bottom periphery of the inner cylinder 62, the limiting plate 622 is positioned at the lower part of the outer cylinder 61, the outer wall of the part of the inner cylinder 62 positioned in the inner cavity of the outer cylinder 61 is provided with filter holes 623 at intervals, the inner walls at two sides of the inner cylinder 62 are respectively provided with guide plates 624 which are inclined downwards at intervals in a staggered manner, the impurity removing covers 63 are arranged at intervals on the inner wall of the outer cylinder 61, the cover openings of the impurity removing covers 63 face the inner cylinder 62 respectively, the impurity removing covers 63 are connected with the impurity removing pipes 66, the impurity removing pipes 66 penetrate through the side wall of the outer cylinder 61 and are connected with the induced draft tube 67, the induced draft tube 67 is connected with the induced draft opening of the induced draft tube 64, the air outlet of the induced draft tube 64 is connected with the collecting box 65, and the collecting box 65 is arranged at the side part of the screening mechanism 1;

as shown in fig. 1, a hopper 7, the hopper 7 is detachably disposed at the top end of an outer cylinder 61, specifically, plug bushes 612 are disposed at intervals at the top end of the outer cylinder 61, plug posts 71 are disposed at positions corresponding to the plug bushes 612 at the bottom end of the hopper 7, bottoms of the plug posts 71 are fixedly plugged in the plug bushes 612, bottoms of the hopper 7 are plugged in tops of inner cavities of the inner cylinders 62, a flow regulating mechanism 8 is further disposed at the bottom of the inner cavity of the hopper 7, specifically, as shown in fig. 8, the flow regulating mechanism 8 includes a fixing plate 81, a flow regulating plate 82 and a regulating screw 83, the fixing plate 81 is fixedly mounted between front and rear inner walls of the hopper 7, the flow regulating plate 82 is in an inverted funnel shape, the flow regulating plate 82 is located at a lower portion of the fixing plate 81, the regulating screw 83 is vertically disposed at a middle portion of the inner cavity of the hopper 7, the regulating screw 83 is screwed with the fixing plate 81, a bottom of the regulating screw 83 penetrates through the fixing plate 81 and is fixedly connected with the flow regulating plate 82, the top end of the adjusting screw 83 is provided with a second rotating wheel 831;

as shown in fig. 1, the air separation mechanism 9 includes an air separation box 91 and an air blower 92, the air separation box 91 is located at a side portion of the material guide 5, a material receiving hopper 911 is disposed at a top end of the air separation box 91, the material receiving hopper 911 is located right below the material guide 5, a third material outlet 912 and a fourth material outlet 913 are disposed at a bottom portion of the air separation box 91, the third material outlet 912 corresponds to the material receiving hopper 911, the fourth material outlet 913 is located at a side portion of the third material outlet 912, an air inlet 914 is disposed on a side wall of the air separation box 91, the air inlet 914 is located between the material receiving hopper 911 and the third material outlet 912, the third material outlet 912 is located between the air inlet 914 and the fourth material outlet 913, and the air inlet 914 is connected to an air outlet of the air blower 92 through an air blowing pipe 93.

The working process of the utility model is as follows: when the screening device works, firstly, an appropriate inner cylinder 62 and a screen 13 are selected according to the seed variety to be screened and the grain size requirement to be screened, the aperture of the filtering hole 623 on different inner cylinders 62 is different from the aperture of the screen hole on different screen 13, and the screening device is installed after being selected, when the screening device is installed, the inner cylinder 62 is arranged in the middle of the outer cylinder 61 in a penetrating way until the baffle 621 is contacted with the top end of the outer cylinder 61, at the moment, the upper limiting plate 622 is screwed on the periphery of the bottom of the inner cylinder 62 until the limiting plate 622 is contacted and abutted with the bottom end of the outer cylinder 61, so that the inner cylinder 62 is installed, when the screen 13 is installed, the through holes 131 at the front end and the rear end of the screen 13 are respectively corresponding to the studs 21 on the support block 2, the screen 13 is moved downwards, the top of the studs 21 is upwards passed through the through holes 131, the first nuts 3 are screwed on the top of the studs 21, in addition, when the outer cylinder 61 is installed, the guide holes 6111 on the ear plates 611 at the front side and the rear side of the bottom of the outer cylinder 61 are corresponding to the guide post 124, the guide post 124 upwardly passes through the guide hole 6111, and the top of the guide post 124 is screwed with a second nut 1241, at this time, the lug plate 611 downwardly compresses the second spring 1242, the vibration of the vibration motor 14 can be transmitted to the hopper 7 and the impurity removing mechanism 6 through the second spring 1242, so that the seeds can be better discharged in the hopper 7 and the impurity removing mechanism 6, and blockage is prevented, when the hopper 7 is installed, the bottom of the hopper 7 is inserted into the top of the inner cavity of the inner cylinder 62, and the inserting column 71 is correspondingly inserted into the inserting sleeve 612, at this time, the seeds to be screened are poured into the hopper 7, the draught fan 64, the vibration motor 14 and the blower 92 are started for screening work, the flow regulating mechanism 8 and the flow limiting plate 4 can be regulated during the screening process, the second rotating wheel 831 is positively and reversely rotated when the flow regulating mechanism 8 is regulated, so that the regulating screw 83 is vertically moved, and then the flow regulating plate 82 is driven to realize the vertical movement of the distance between the flow regulating plate 82 and the bottom of the inner cavity of the hopper 7 The seeds are adjusted, so that the flow of the seeds falling into the inner cylinder 62 is adjusted and controlled, the flow-limiting plate 4 is adjusted by only rotating the first rotating wheel 411 to adjust the angle of the flow-limiting plate 4, when the seeds fall into the inner cylinder 62, the falling time is delayed and the seeds are dispersed, so that light impurities such as dust, straw powder and the like contained in the seeds sequentially pass through the filtering holes 623 on the inner cylinder 62, the impurity removing cover 63, the impurity removing pipe 66 and the air guiding pipe 67 to enter the collecting box 65 under the action of the guide plate 624, the seeds fall onto the screen 13 through the impurity removing mechanism 6 and vibrate and fall along the screen 13, at the moment, small-particle seeds contained in the seeds fall to the bottom of the screen box 12 through the screen holes on the screen 13 and are collected through the second discharge hole 123, and the seeds with the particle size meeting the requirements enter the winnowing box 91 through the first discharge hole 122, the guide hopper 5 and the receiving hopper 911, in the process that the seeds fall in the winnowing box 91, the seeds with the particle size meeting the requirement but being empty can be blown down into the fourth discharge hole 913 to be collected under the action of the blower 92, and the seeds meeting the screening requirement fall down into the third discharge hole 912 to be collected. The utility model has the advantages of can collect light impurity such as dust, the garrulous end of straw that contain in the seed, reduce environmental pollution, can filter the seed of different varieties, the commonality is strong, the effect of screening is good.

Claims (8)

1. The utility model provides a seed sieving mechanism for farming which characterized in that includes:

the screening mechanism comprises an underframe, a screen box with an opening at the top, a screen and a vibrating motor, wherein four corners at the bottom end of the screen box are respectively connected with four corners at the top end of the underframe through first springs, the screen is obliquely and detachably arranged in an inner cavity of the screen box, a first discharge port opposite to the lower end of the screen is arranged on the side wall of the screen box, a material guide hopper is arranged outside the first discharge port, a second discharge port is arranged at the bottom end of the screen box, and the vibrating motor is arranged at the bottom end of the screen box and positioned at the side part of the second discharge port;

the edulcoration mechanism, the edulcoration mechanism is located the top of the higher one end of screen cloth, the edulcoration mechanism includes urceolus, upper and lower open-ended inner tube, edulcoration cover, draught fan and collecting box, urceolus demountable installation is in the top of sieve case, the inner tube can be dismantled and wear to establish the middle part of urceolus, the upper and lower both ends of inner tube surpass respectively the upper and lower both ends of urceolus, the inner tube is located the interval is provided with the filtration pore on the outer wall of the part of urceolus inner chamber, the interval is crisscross on the both sides inner wall of inner tube respectively and is provided with the decurrent stock guide of slope, the edulcoration cover interval sets up on the inner wall of urceolus and the cover mouth of edulcoration cover is respectively towards the inner tube, the edulcoration cover is connected with the edulcoration pipe, the edulcoration pipe runs through the lateral wall of urceolus and is connected with the induced duct, the induced duct with the induced air inlet of draught fan is connected, the air outlet of the induced draft fan is connected with the collection box, and the collection box is arranged on the side part of the screening mechanism;

the feeding hopper is detachably arranged at the top end of the outer barrel, the bottom of the feeding hopper is inserted at the top of the inner cavity of the inner barrel, and the bottom of the inner cavity of the feeding hopper is also provided with a flow regulating mechanism;

winnowing mechanism, winnowing mechanism includes winnowing box and air-blower, the winnowing box is located the lateral part of guide fill, the top of winnowing box is provided with connects the hopper, it is located to connect the hopper under the guide fill, the bottom of winnowing box is provided with third discharge gate and fourth discharge gate, the third discharge gate with it corresponds to connect the hopper position, the fourth discharge gate is located the lateral part of third discharge gate, be provided with the air intake on the lateral wall of winnowing box, the air intake is located connect the hopper with between the third discharge gate, and the third discharge gate is located the air intake with between the fourth discharge gate, the air intake with the blast orifice of air-blower passes through the blast pipe and connects.

2. The seed screening device for agricultural planting according to claim 1, wherein the screen box has opposite positions and spaced apart from each other on the front and rear inner walls, the screen mesh has front and rear ends respectively located at the top ends of the support blocks, the support blocks have studs on the top ends thereof, the screen mesh has front and rear ends respectively provided with through holes corresponding to the studs, the studs have top ends that extend upward through the through holes and are screwed with first nuts.

3. The seed screening apparatus for agricultural planting according to claim 1, wherein the top of the screen mesh is provided with a current limiting plate at intervals, the current limiting plate is provided with short shafts at the front and rear ends thereof, the screen box is provided with shaft holes at the front and rear side walls thereof at positions opposite to the short shafts, the short shafts are tightly inserted into the shaft holes and can rotate in the shaft holes, and the outer end of one of the short shafts is provided with a first rotating wheel.

4. The seed screening apparatus for agricultural planting according to claim 1, wherein the front and rear ends of the bottom of the outer cylinder are respectively provided with ear plates, the front and rear ends of the top of the screen box are respectively provided with guide posts corresponding to the ear plates, the ear plates are respectively provided with guide holes corresponding to the guide posts, the tops of the guide posts are upwardly passed through the guide holes and are screwed with second nuts, the middle parts of the guide posts are sleeved with second springs, and the second springs are located between the screen box and the ear plates.

5. The seed screening device for agricultural planting according to claim 1, wherein a baffle is fixedly sleeved on the top periphery of the inner cylinder and is located on the upper portion of the outer cylinder, a limiting plate is screwed on the bottom periphery of the inner cylinder, and the limiting plate is located on the lower portion of the outer cylinder.

6. The seed screening apparatus for agricultural planting according to claim 1, wherein the top end of the outer cylinder is provided with plug bushes at intervals, the bottom end of the loading hopper is provided with plug posts corresponding to the plug bushes, and the bottoms of the plug posts are fixedly plugged in the plug bushes.

7. The seed screening device for agricultural planting according to claim 1, wherein the flow adjusting mechanism comprises a fixing plate, a flow adjusting plate and an adjusting screw, the fixing plate is fixedly installed between the front inner wall and the rear inner wall of the loading hopper, the flow adjusting plate is in an inverted funnel shape, the flow adjusting plate is located at the lower part of the fixing plate, the adjusting screw is vertically arranged in the middle of the inner cavity of the loading hopper and is in threaded connection with the fixing plate, the bottom of the adjusting screw penetrates through the fixing plate and is fixedly connected with the flow adjusting plate, and a second rotating wheel is arranged at the top end of the adjusting screw.

8. An agricultural seed screening apparatus as set forth in claim 1 wherein said screen box has a "funnel-shaped" bottom end.

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