Agricultural technical service seed screening device

Abstract

The utility model discloses a kind of seed screening equipment for agricultural technology service, including the screening bucket of inclination setting, the screening bucket both ends are connected first circular plate and second circular plate respectively by bearing, first circular plate height is greater than second circular plate, coaxially fixed U-shaped longitudinal section's material receiving arc plate in screening bucket, screening groove is arranged in the circumferential array of screening bucket inner wall, the depth of each screening groove's support end is greater than the depth of separation end, and depth gradually changes direction along the circumferential tangential of screening bucket;The center of first circular plate is penetrated into the feeding pipe, the feeding port of feeding pipe is located first circular plate outside, discharge port is inserted into the inner chamber of screening bucket and is towards screening groove;Second circular plate is equipped with the upper sieve opening of the low end of material receiving arc plate and the lower sieve opening of the low end of screening bucket communication. The utility model breaks through the grading limitation of traditional fixed depth screen groove, makes the shedding point of different size seeds under the action of gravity produce significant space separation, effectively improves screening efficiency.

Description

Technical Field

[0001] This utility model relates to the field of seed screening technology, specifically to a seed screening device for agricultural technical services. Background Technology

[0002] In agricultural production and technical services, seed size grading is a key step in improving sowing emergence rate and crop yield. Traditional screening equipment mostly uses a vibrating flat screen structure, which achieves grading through screens with different aperture sizes. However, this method has significant limitations. The screen holes are easily clogged by moist seeds or impurities, causing the sorting efficiency to drop sharply with the duration of operation. Summary of the Invention

[0003] The purpose of this invention is to provide a seed screening device for agricultural technical services, which has the advantage of high screening efficiency and solves the problems in the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A seed screening device for agricultural technical services includes an inclined screening barrel. A first circular plate and a second circular plate are connected to both ends of the screening barrel via bearings. The first circular plate is higher than the second circular plate, and the two circular plates are fixedly connected by circumferentially distributed connecting rods. A U-shaped longitudinal section material-bearing arc plate is coaxially fixed inside the screening barrel, with its two ends connected to the inner walls of the first and second circular plates, respectively. The inner wall of the screening barrel is provided with circumferentially arrayed screening grooves. The depth of the supporting end of each screening groove is greater than the depth of the detaching end, and the depth gradually changes tangentially along the circumference of the screening barrel. A feed pipe passes through the center of the first circular plate, with the feed inlet located outside the first circular plate and the discharge outlet extending into the inner cavity of the screening barrel and facing the screening grooves. The second circular plate has an upper sieve opening connecting to the lower end of the material-bearing arc plate and a lower sieve opening connecting to the lower end of the screening barrel. A drive motor is fixed to the outside of the first circular plate, and the output shaft of the drive motor is connected to a drive wheel, the outer wall of which abuts against the outer wall of the screening barrel.

[0005] Preferably, the axis of the screening bucket forms an angle of 10-20° with the horizontal plane.

[0006] Preferably, the depth difference between the supporting end and the detaching end of the screening groove is 30%-50% of the average seed thickness.

[0007] Preferably, the axis of the discharge port of the feed pipe forms an angle of 15°-30° with the tangential direction of the inner wall of the screening barrel.

[0008] Preferably, the U-shaped opening of the material-bearing arc plate faces the inner wall of the screening barrel, and the lowest point of the arc surface is connected to the upper screen opening.

[0009] Preferably, the drive wheel is made of rubber.

[0010] Preferably, the number of screening slots is 20-40 per circumference.

[0011] Preferably, the spacing between the screening grooves is 1.2-1.5 times the maximum diameter of the seed.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: The depth of the screening trough in this invention is gradually varied along the circumference of the screening barrel, with the support end being significantly deeper than the detachment end. This structure causes seeds to exhibit differentiated embedding behavior during rotation. Large-sized seeds can only embed their tails into the deep part of the support end, while their heads are exposed in the shallow detachment end. When the screening barrel rotates from the detachment end to the support end, large-sized seeds slip down first due to the lack of support at their heads during the lifting process, while small-sized seeds are lifted to a higher position because they are fully embedded in the trough. This breaks through the grading limitations of traditional fixed-depth screening troughs and creates significant spatial separation of the detachment points of seeds of different sizes under the action of gravity, effectively improving screening efficiency. Attached Figure Description

[0013] Figure 1 This is the first axonometric view of the overall structure of this utility model; Figure 2 This is a second axonometric view of the overall structure of this utility model; Figure 3 This is a cross-sectional view of the overall structure of this utility model; Figure 4 This is a structural diagram of the internal structure of the screening barrel of this utility model; Figure 5 This is a cross-sectional view of the screening bucket of this utility model in its working state.

[0014] In the diagram: 1. Screening barrel; 2. First circular plate; 3. Second circular plate; 4. Connecting rod; 5. Material-bearing arc plate; 6. Screening trough; 7. Supporting end; 8. Disconnecting end; 9. Feed pipe; 10. Feed inlet; 11. Discharge outlet; 12. Upper screen opening; 13. Lower screen opening; 14. Drive motor; 15. Output shaft; 16. Drive wheel. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] To address the low sorting efficiency problem in existing technologies, the following technical solution is proposed. Please refer to [link / reference needed]. Figure 1-5 ; A seed screening device for agricultural technical services includes a screening barrel 1, which is arranged horizontally. The extension direction of the screening barrel 1 forms an angle of 10-20° with the horizontal plane. The two ends of the screening barrel 1 are rotatably connected to a first circular plate 2 and a second circular plate 3 via bearings. The height of the first circular plate 2 is set at that of the second circular plate 3. The bottoms of the first circular plate 2 and the second circular plate 3 are placed on the ground by support rods. The first circular plate 2 and the second circular plate 3 are fixedly connected by a connecting rod 4 arranged around them to ensure structural stability.

[0017] A material-supporting arc plate 5 is provided at the axial position of the screening barrel 1. The longitudinal section of the material-supporting arc plate 5 is U-shaped. The extension direction of the material-supporting arc plate 5 is the same as the extension direction of the screening barrel 1. The two ends of the material-supporting arc plate 5 are fixedly connected to the inner walls of the first circular plate 2 and the second circular plate 3, respectively. The U-shaped opening of the material-supporting arc plate 5 faces the inner wall of the screening barrel 1, and the lowest point of the arc surface is connected to the upper screen opening 12.

[0018] Screening grooves 6 are provided on the inner wall of the screening barrel 1. The screening grooves 6 are arranged in an array around the axis of the screening barrel 1. The number of screening grooves 6 is 20-40 per circumference. The spacing between the screening grooves 6 is 1.2-1.5 times the maximum diameter of the seed. The screening grooves 6 are adapted to the shape of the seed to be screened. One end of the screening groove 6 is the support end 7 and the other end is the release end 8. The depth of each screening groove 6 gradually changes along the circumference. The starting end of the screening groove 6 is the support end 7 with a greater depth, and the ending end is the release end 8 with a shallower depth. The depth difference between the support end 7 and the release end 8 of the screening groove 6 is 30%-50% of the average thickness of the seed. Under normal circumstances, the depth of the support end 7 of the screening groove 6 is 3-8mm, and the depth of the release end 8 is 1-3mm.

[0019] A feed pipe 9 passes through the center of the first circular plate 2. The feed inlet 10 of the feed pipe 9 is located outside the first circular plate 2 and faces upward. The discharge outlet 11 of the feed pipe 9 is located inside the screening barrel 1 and faces the bottom inner wall of the screening tank 6. The axis of the discharge outlet 11 of the feed pipe 9 forms an angle of 15°-30° with the tangential direction of the inner wall of the screening barrel 1.

[0020] The second circular plate 3 has an upper screen opening 12 and a lower screen opening 13. The upper screen opening 12 is connected to the lower end of the material receiving arc plate 5, and the lower screen opening 13 is connected to the lower end of the screening barrel 1.

[0021] A drive motor 14 is installed at the bottom of the outer wall of the first circular plate 2. The output shaft 15 of the drive motor 14 passes through the first circular plate 2 and the second circular plate 3. A drive wheel 16 is installed on the output shaft 15. The outer wall of the drive wheel 16 abuts against the outer wall of the screening barrel 1. The drive wheel 16 is made of rubber to increase friction. The drive motor 14 drives the drive wheel 16 to rotate through the output shaft 15. The drive wheel 16 causes the screening barrel 1 to rotate due to friction with the outer wall of the screening barrel 1. The screening barrel 1 rotates in the direction from the supporting end 7 to the disengaging end 8. Seeds enter the screening barrel 1 and tumble continuously, and are continuously embedded in the screening groove 6. Larger seeds are unloaded after reaching a certain height, and smaller seeds are thrown into the supporting arc plate 5 after reaching the top of the supporting arc plate 5. Finally, large seeds are output through the lower sieve 13, and small seeds are output through the upper sieve 12.

[0022] Working principle: When the seed screening equipment is working, the drive motor 14 drives the drive wheel 16 to rotate through the output shaft 15. The drive wheel 16 makes frictional contact with the outer wall of the screening barrel 1, causing the screening barrel 1 to rotate from the disengagement end 8 to the support end 7, that is, the shallow groove end is lifted first. Seeds enter from the feed port 10 of the feed pipe 9 and fall into the inner cavity of the rotating screening barrel 1 through the discharge port 11. Under the action of centrifugal force, the seeds tumble with the screening barrel 1 and are embedded in the screening trough 6. Due to their large size, only the tail of the large seeds can be embedded in the deep part of the supporting end 7, while the head is located in the shallow part of the detachment end 8. When the screening trough 6 rotates to an inclination angle of about 50°, the head loses support due to the insufficient depth of the detachment end 8. Under the action of gravity, it first slides out of the trough, falls to the bottom of the screening barrel 1, and rolls down the inclined barrel wall to the lower screen opening 13 for discharge. Due to their small size, the small seeds can be completely embedded in the screening trough 6. When the barrel rotates to an inclination angle of about 70°, they are detached from the trough by centrifugal force and thrown into the receiving arc plate 5. The seeds slide down the U-shaped arc surface of the receiving arc plate 5 and are finally output through the upper screen opening 12.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A seed screening device for agricultural technical services, comprising a screening barrel (1) arranged at an angle, characterized in that, The screening barrel (1) is connected to a first circular plate (2) and a second circular plate (3) at both ends by bearings. The height of the first circular plate (2) is greater than that of the second circular plate (3). The two circular plates are fixedly connected by circumferentially distributed connecting rods (4). A U-shaped longitudinal section material-bearing arc plate (5) is coaxially fixed inside the screening barrel (1). The two ends of the material-bearing arc plate (5) are connected to the inner walls of the first circular plate (2) and the second circular plate (3) respectively. The inner wall of the screening barrel (1) is provided with screening grooves (6) arranged in a circumferential array. The depth of the supporting end (7) of each screening groove (6) is greater than the depth of the detaching end (8), and the depth gradient direction is along the screening barrel (1). ) Circumferential tangential; the feed pipe (9) passes through the center of the first circular plate (2), the feed port (10) of the feed pipe (9) is located outside the first circular plate (2), and the discharge port (11) extends into the inner cavity of the screening barrel (1) and faces the screening trough (6); the second circular plate (3) is provided with an upper screen port (12) that connects to the lower end of the material bearing arc plate (5) and a lower screen port (13) that connects to the lower end of the screening barrel (1); the drive motor (14) is fixed on the outside of the first circular plate (2), the output shaft (15) of the drive motor (14) is connected to the drive wheel (16), and the outer wall of the drive wheel (16) abuts against the outer wall of the screening barrel (1).

2. The seed screening device for agricultural technical services according to claim 1, characterized in that, The axis of the screening bucket (1) forms an angle of 10-20° with the horizontal plane.

3. The seed screening device for agricultural technical services according to claim 2, characterized in that, The depth difference between the supporting end (7) and the detaching end (8) of the screening groove (6) is 30%-50% of the average thickness of the seed.

4. The seed screening device for agricultural technical services according to claim 3, characterized in that, The axis of the outlet (11) of the feed pipe (9) forms an angle of 15°-30° with the tangential direction of the inner wall of the screening barrel (1).

5. The seed screening device for agricultural technical services according to claim 4, characterized in that, The U-shaped opening of the material-bearing arc plate (5) faces the inner wall of the screening bucket (1), and the lowest point of the arc surface is connected to the upper screen opening (12).

6. The seed screening device for agricultural technical services according to claim 5, characterized in that, The drive wheel (16) is made of rubber.

7. The seed screening device for agricultural technical services according to claim 6, characterized in that, The number of screening slots (6) is 20-40 per circumference.

8. The seed screening device for agricultural technical services according to claim 7, characterized in that, The spacing between the screening grooves (6) is 1.2-1.5 times the maximum diameter of the seed.

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