Efficient and clean processing technology and system for sunflower seeds

Abstract

The invention discloses an efficient and clean processing technology and system for sunflower seeds for planting. The technology sequentially comprises the steps of air screen cleaning, specific gravity fine selection, color sorting treatment, crack seed removal, grading treatment, fluidized bed drying and film forming, vacuum powder removal and automatic packaging. The system is formed by sequentially connecting an elevator, an air screen cleaning machine, a parallel specific gravity cleaning machine, a crawler-type color sorter, a magnetic separation crack removing machine, a grading system, a fluidized bed dryer, a film forming bin, a vacuum dust collection device, a packing scale, an impurity classifying and collecting bin, a pulse dust collector and a central control system in the material flow direction. The invention creatively provides a crack seed removal technology of'magnetic powder infiltration and magnetic separation ', magnetic powder selectively infiltrates into seed microcracks and is adsorbed and separated by a high-intensity magnetic field, efficient and accurate removal of the microcrack seeds is realized, and meanwhile, parallel specific gravity concentration, six-stage grading, coating, film forming and curing and full-process dust removal are combined, so that the seed removal efficiency is improved. And finally, high-purity, high-germination-rate, low-damage and clean production of the sunflower seeds is realized.

Description

Technical Field

[0001] This invention belongs to the field of agricultural machinery and seed processing technology, specifically relating to a highly efficient and clean processing technology and system for sunflower seeds for seed production. Background Technology

[0002] Seed sunflower seeds are a crucial foundation of the sunflower industry, and their quality directly impacts crop yield and quality. However, harvested seed sunflower seeds often carry various impurities, including straw fragments, clods of soil, stones, empty or shriveled seeds, moldy seeds, and seeds from other crops. Particularly noteworthy is the high likelihood of damaged seeds with microcracks on their surface during mechanized harvesting and threshing. These microcracks, typically less than 0.1 mm wide and difficult to detect with the naked eye, provide pathways for pathogen infection, leading to a significant decrease in germination rate after sowing. Actual production statistics indicate that this can reduce germination rates by 10% to 20%.

[0003] Currently, traditional seed processing techniques primarily employ physical methods such as air separation, sieving, and gravity separation for cleaning. For example, Chinese patent CN201510234567.8 discloses a forage seed cleaning device that improves cleaning efficiency by combining air separation and gravity separation. However, this type of technology mainly relies on physical characteristics such as seed size, weight, color, or electrical conductivity for sorting. It has very limited ability to identify defective seeds with similar physical characteristics to healthy seeds, only exhibiting surface micro-cracks, and cannot effectively remove them. On the other hand, Chinese patent CN201820123456.7 provides a seed coating machine, focusing on improving the coating equipment, but it does not address the system integration and optimization issues of the entire process from cleaning to coating. In particular, the solidification and film formation of the seed coating agent after coating is weak, easily leading to a high coating peeling rate, affecting efficacy and sowing smoothness.

[0004] In addition, existing seed processing production lines have the following common technical shortcomings: First, the sorting process is mostly a simple series connection of single equipment, with limited sorting accuracy, making it difficult to achieve comprehensive and high-precision removal of large, small, light, and inferior seeds; Second, dust control at material drop points in each production stage is insufficient, resulting in a harsh production environment that affects the health of operators and does not meet environmental protection requirements; Third, all sorted impurities are usually collected mixed together, and the parts with reuse value (such as intact foreign crop seeds) are not sorted and recycled, resulting in resource waste.

[0005] It is worth noting that while magnetic particle testing, widely used in industry, can efficiently detect cracks on the surface of metal components, its principle relies on the high magnetic permeability of metallic materials and cannot be directly applied to crack detection in non-metallic or organic biological materials such as sunflower seeds. Therefore, how to efficiently and accurately identify and remove micro-cracked seeds from sunflower seeds for seed production without damaging the embryo has remained a technical challenge that has not been effectively solved in this field, hindering further improvements in the processing quality of sunflower seeds for seed production.

[0006] In summary, existing technologies lack a clean and automated processing solution that can systematically address the comprehensive issues of removing cracks in sunflower seeds for seed production, high-precision sorting, ensuring firm coating, controlling dust, and utilizing impurities for resource recovery. Summary of the Invention

[0007] The purpose of this invention is to provide a highly efficient and clean processing technology and system for sunflower seeds, which solves the problems of difficult removal of cracked seeds, low sorting accuracy, high coating shedding rate, and serious dust pollution in the prior art, and achieves standardized production with high seed purity, high germination rate, and low damage.

[0008] The technical solution adopted to solve the above technical problems is: A highly efficient and clean processing technology for sunflower seeds for planting includes the following steps: Step 1, Air Screening: The harvested sunflower seeds are sent to the air screen cleaning machine via the first elevator. The vibrating screen removes large impurities larger than the seeds and small impurities smaller than the seeds. At the same time, the controlled airflow in the equipment removes light materials such as broken leaves and dust. Step 2, Gravity Selection: The seeds processed in Step 1 are fed into two parallel gravity separators via a second elevator; based on the difference in bulk density between the seeds and impurities, the light, empty, moldy seeds and seeds of foreign crops are removed under the action of vibration and airflow. Step 3, Color sorting: The seeds selected by specific gravity are sent to the conveyor color sorter through the third elevator; the conveyor color sorter uses a combination of high-resolution CCD camera and LED light source to capture images of the seeds passing through a single layer and compare them with the preset standard color spectrum, thereby identifying and spraying away moldy, immature or abnormally colored seeds. Step 4: Cracked Seed Removal: The color-sorted seeds are fed into the feed hopper of the magnetic crack removal machine. First, the seeds are mixed with fine magnetic powder with a particle size of 5–20 μm in a low-speed stirrer at a mixing ratio of 0.15–0.25% of the seed weight. This allows the magnetic powder to selectively penetrate into the micro-cracks on the seed surface under mechanical agitation. Subsequently, the mixture is sent to the area of ​​a strong magnetic roller with a magnetic field strength of 0.3–0.5 T. The magnetic roller rotates at a speed of 150–220 rpm, adsorbing and separating the cracked seeds with magnetic powder adsorbed on their surface, thus achieving non-destructive and precise removal. Step 5, Grading: The qualified seeds after removing cracks are sent to the grading system; first, the seeds are initially separated into two groups, "large seeds" and "small seeds", by a vibrating grading screen; then, these two groups are respectively sent to two precision grading machines for further precise grading into three different particle size specifications; finally, the seeds of a total of six grades are transported to the corresponding grading bins for temporary storage. Step Six: Fluidized Bed Drying and Film Formation: According to production needs, seeds of the specified grade are released from the grading chamber and sent to the coating machine for coating with a chemical or film-forming agent. The coated seeds are immediately sent to the fluidized bed dryer and dried for 10–15 minutes under the action of hot air at 60–70℃ to quickly remove the surface solvent. The dried seeds are then sent to the film-forming chamber with constant temperature and humidity and left to mature in an environment of 20–25℃ and 50–60% relative humidity for 2–4 hours to allow the seed coating agent to fully cross-link and solidify, forming a strong film layer. Step 7, Vacuum dust removal: After film formation and maturation, the seeds are conveyed into a vacuum dust collection device via a conveyor belt. This device uses negative pressure suction and is equipped with a stainless steel filter screen with a pore size of no more than 1 mm to effectively remove loose seed coating agent powder generated on the seed surface during the coating process, thereby improving the smoothness of the seed surface. Step 8, Automatic Packaging: The pure seeds, after vacuum de-powdering, are sent to the packaging scale for precise weighing via the fourth elevator, and then sent to the automatic packaging machine to complete bagging and sealing. Finally, they are stacked by the palletizing equipment.

[0009] Preferably, in step two, two gravity separators are connected in parallel to the process to improve the overall processing capacity of the system.

[0010] Preferably, in step four, the amount of fine magnetic powder used is 0.15–0.25% of the seed weight.

[0011] Preferably, in step four, the magnetic field strength of the magnetic separation crack removal machine 5 is 0.3–0.5 T, and the rotation speed of the strong magnetic roller is 150–220 rpm.

[0012] Preferably, in step six, the static curing time in the film-forming chamber 8 is 2-4 hours, the ambient temperature is controlled at 20-25℃, and the relative humidity is controlled at 50-60%.

[0013] Preferably, in step seven, the vacuum cleaning device 9 is equipped with a stainless steel filter with a pore size ≤ 1 mm.

[0014] Preferably, the process also includes an impurity classification and collection step: impurities discharged from the air screen cleaner, gravity cleaner, tracked color sorter, magnetic crack removal machine and grading system during the entire processing are collected into a valuable impurity collection bin and a non-valuable impurity collection bin, respectively.

[0015] A high-efficiency, clean processing system for sunflower seeds for planting includes a first elevator arranged sequentially along the material flow direction, its outlet connected to the inlet of an air-screen cleaner; a second elevator is located below the good-quality outlet of the air-screen cleaner, its outlet connected to the inlet of two parallel gravity separators via a diversion valve; a third elevator is located below the confluence of the good-quality outlets of the two gravity separators, its outlet connected to the inlet of a tracked color sorter; and a magnetic crack removal system is immediately following the good-quality outlet of the tracked color sorter. The magnetic separation crack rejection machine has its qualified product outlet connected to the inlet of the grading system via a conveying device; the outlets of each grading bin in the grading system are connected to the inlet of the coating machine via valves; the outlet of the coating machine is connected to the inlet of the fluidized bed dryer via a conveyor belt; a film-forming bin is located below the outlet of the fluidized bed dryer; the outlet of the film-forming bin is connected to the inlet of the vacuum dust collection device via a conveyor belt; the outlet of the vacuum dust collection device is connected to the inlet of the packaging scale via a fourth elevator; and the outlet of the packaging scale is connected to the inlet of the automatic packaging machine. In addition, the system is equipped with a collection bin for useful impurities and a collection bin for non-useful impurities. These bins are selectively connected to the impurity discharge ports of the air screen cleaner, gravity cleaner, tracked color sorter, magnetic crack removal machine, and grading system via conveying pipelines. Pulse dust collectors are installed at the dust emission points of the air screen cleaner, gravity cleaner, grading system, coating machine, and packaging scale. The entire system is uniformly controlled by a central control system.

[0016] Preferably, the two gravity separators are arranged side by side and connected to the discharge port of the second elevator through an electrically controlled diversion valve to achieve uniform material distribution and flow control.

[0017] Preferably, the six grading bins in the grading system are arranged in a 2×3 array, and each grading bin's outlet is equipped with an electrically controlled valve, which is connected to the central control system.

[0018] The beneficial effects of this invention are as follows: (1) This invention innovatively introduces "magnetic powder infiltration + magnetic separation" technology, solving the industry problem of traditional methods being unable to detect and remove seeds with micro-cracks on the surface, thereby greatly improving the removal rate of cracked seeds. This invention also combines a sorting system consisting of "air sieving → gravity sorting → color sorting", which can comprehensively remove various impurities, thus greatly improving the purity and germination rate of the final product. At the same time, the unique "fluidized bed drying + film-forming chamber static placement + vacuum powder removal" coating post-treatment process of this invention ensures that the seed coating agent adheres firmly and has a low shedding rate, greatly guaranteeing the efficacy of the seeds and the smoothness of sowing.

[0019] (2) The present invention adopts a design of two gravity separators operating in parallel, which increases the overall processing capacity by more than 50% and meets the needs of large-scale production. The central control system automates and controls the entire process from raw grain to finished product palletizing, which not only greatly reduces manual intervention and improves production efficiency and product consistency, but also controls the dust emission concentration by configuring multiple sets of pulse dust collectors at the main material drop points along the line, effectively improving the working environment and meeting the environmental protection requirements of modern clean production.

[0020] (3) This invention breaks through the traditional processing model of mixed impurities and innovatively sets up an impurity classification and recycling system to collect valuable impurities (such as intact foreign crop seeds) and worthless impurities separately. This design not only reduces waste disposal costs, but also transforms some impurities into reusable resources, creating additional economic value and forming a circular economy model. The entire process and system achieve high recovery rate and maximized resource utilization while ensuring a low damage rate, resulting in significant comprehensive economic benefits. Attached Figure Description

[0021] Figure 1 This is a flowchart of the sunflower seed processing technology for the present invention.

[0022] In the diagram: 1-Elevator, 2-Air screen cleaner, 3-Gravity cleaner, 4-Crawler color sorter, 5-Magnetic crack removal machine, 6-Grading system, 7-Fluidized bed dryer, 8-Film forming bin, 9-Vacuum dust collection device, 10-Packaging scale, 11-Collection bin for useful impurities, 12-Collection bin for non-useful impurities, 13-Pulse dust collector, 14-Central control system. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figure 1 As shown, the efficient and clean processing system for sunflower seeds provided in this embodiment mainly constructs an automated, closed-loop continuous processing line. The system uses a central control system 14 as its command center, and its main material flow is as follows: The raw seed material is first conveyed by the first elevator 1 to the feed inlet at the top of the air screen cleaner 2. The air screen cleaner 2 integrates a double-layer vibrating screen and a controllable air duct to complete the initial separation of large impurities, small impurities, and lightweight materials. The cleaned seeds fall into the receiving port of the second elevator below by gravity.

[0025] The second elevator lifts the material and conveys it to an electrically controlled diversion valve, which evenly distributes the material flow to two parallel gravity separators 3. Based on the density difference between seeds and impurities, the gravity separators 3, under the combined action of vibration and precise airflow, further remove empty, moldy, and foreign crop seeds. The clean seeds flowing from the two good-quality outlets converge and are then conveyed by a third elevator to a tracked color sorter 4.

[0026] The tracked color sorter 4 uses a high-resolution CCD camera to scan the seeds passing through a single layer under LED light, and accurately removes abnormal seeds such as moldy and insect-damaged seeds based on color differences. The color-sorted seeds are then fed directly into the feed hopper of the magnetic separation crack removal machine 5 through a chute.

[0027] Before the magnetic separation crack removal machine 5, a low-speed mixing device (not shown separately in the diagram) is installed to uniformly mix the seeds with fine magnetic powder of a specific particle size of 5-20 μm at a ratio of 0.15-0.25%. The mixture then enters the magnetic separator, where, under the adsorption of a strong magnetic roller with a magnetic field strength of 0.3-0.5 T, the cracked seeds with magnetic powder permeated into their surface are effectively separated and removed.

[0028] After magnetic separation, the healthy seeds enter the grading system 6 via a conveyor belt. The system first separates the seeds into two main streams, "large" and "small," using a vibrating grading screen. Then, the seeds from these two streams enter two precision grading machines, which ultimately accurately sieve the seeds into six grades and temporarily store them in the corresponding grading bins.

[0029] According to orders or agronomic requirements, seeds of a specified grade are fed into a coating machine for coating by controlling an electrically controlled valve at the bottom of the grading chamber. The coated seeds immediately enter a fluidized bed dryer 7, where they are rapidly dried for 10-15 minutes under hot air at 60-70℃. The dried seeds are then sent to a film-forming chamber 8, where they are left to mature in a constant temperature and humidity environment of 20-25℃ and 50-60% relative humidity for 2-4 hours, allowing the seed coating agent to fully cross-link and solidify.

[0030] After ripening, the seeds are conveyed by a conveyor belt into a vacuum dust collection device 9, which is equipped with a stainless steel filter screen with a pore size ≤1 mm. The device thoroughly removes loose powder from the seed surface through negative pressure suction. Finally, the clean and smooth seeds are sent by a fourth elevator to a packaging scale 10 for precise weighing, and then enter an automatic packaging machine to complete the sealing and stacking of the seeds.

[0031] In addition, the impurity and dust treatment subsystem is equipped with a collection bin 11 for useful impurities and a collection bin 12 for non-useful impurities. Impurities discharged from the air screen cleaner 2, gravity cleaner 3, belt cleaner 4, magnetic crack removal machine 5, and grading system 6 are transported to these two bins according to their properties, such as intact foreign crop seeds and gravel, via a negative pressure air conveying system or screw conveyor, achieving classified recycling. Furthermore, five sets of pulse dust collectors 13 are installed at major dust emission points throughout the line, such as the heads of each elevator and above the packaging scale 10, and are linked with the dust collection fan 23 to ensure a clean production environment and dust emission concentration below 8 mg / m³.

[0032] Example 1: To verify the practical effect of this invention, 10 tons of sunflower seeds harvested from a farm in Inner Mongolia were selected for processing. The initial purity of this batch of raw materials was approximately 88%, and the laboratory standard germination rate was 82%. Sampling tests revealed that approximately 6% of the seeds contained micro-cracks on the surface. The seeds were then processed using the steps of this invention. (1) Air screening: removes large impurities, small impurities and light materials; (2) Gravity separation: Two gravity separators are connected in parallel to remove empty, shriveled, and moldy grains; (3) Color sorting: Remove moldy or abnormally colored seeds; (4) Crack removal: The seed is mixed with 10μm magnetic powder (0.2% dosage) and fed into a magnetic separation crack removal machine (magnetic field strength 0.42T, rotation speed 190rpm). (5) Grading: Divided into six levels, temporarily stored in the grading warehouse; (6) Coating and drying: After coating, the product is dried in a fluidized bed (65℃, 12 min). (7) Film formation: Let the film stand and mature in the film forming chamber (23℃, 55% RH) for 2.5 hours; (8) Vacuum de-dust removal and packaging (20 kg / bag).

[0033] The processing procedure must strictly follow the above process route and the following process parameters: In the crack removal section of magnetic separation, magnetic iron powder with a particle size of 10μm is used, and the amount added is 0.2% of the seed weight. The magnetic field strength of the magnetic separator is set to 0.42T, and the magnetic roller speed is 190rpm.

[0034] Fluidized bed drying: temperature 65℃, drying time 12 minutes.

[0035] Film-forming chamber static curing: temperature 23℃, relative humidity 55%, static time 2.5 hours.

[0036] After processing, the finished seeds were tested according to GB / T 3543.3-1995 "Specifications for the Inspection of Crop Seeds". The results are shown in the table below: Table 1. Analysis of Finished Seed Products detection indicators Total throughput (t) Qualified seed yield (t) Seed purity (%) Germination rate (%) Mechanical damage rate (%) Cracked seed removal rate (%) Coating shedding rate (%) Amount of useful impurities recovered (kg) Results after processing 10 8.78 99.7 96.5 0.5 98.7 0.3 125 Comparative example: In contrast, the same batch of 10 tons of raw seeds was treated using a traditional "wind sieving combined with single-gravity fine selection" process. The results were: seed purity 92.1%, germination rate 84.8%, cracked seed residue rate as high as 41%, and coating shedding rate 3.6%.

[0037] A comparison of data from the embodiments and comparative examples clearly demonstrates that the efficient and clean processing technology and system for sunflower seeds provided by this invention has achieved significant improvements in key quality indicators such as seed purity, germination rate, efficiency in removing cracked seeds, and coating adhesion. This invention not only systematically solves the industry bottleneck of the difficulty in removing micro-cracked seeds, but also achieves a leap in the processing quality and overall benefits of sunflower seeds through full-process automation, clean production, and resource recycling, fully meeting the intended objectives of the invention.

[0038] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0039] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A highly efficient and clean processing technology for sunflower seeds for planting, characterized in that, Includes the following steps: Step 1, air screening: The harvested sunflower seeds are sent to the air screening machine (2) via the first elevator (1). The vibrating screen removes large impurities larger than the seeds and small impurities smaller than the seeds. At the same time, the controlled airflow in the equipment removes light materials such as broken leaves and dust. Step 2, specific gravity selection: The seeds processed in Step 1 are sent to two parallel specific gravity separators (3) through the second elevator; based on the difference in bulk density between the seeds and impurities, under the action of vibration and airflow, light empty and shriveled grains, moldy grains and foreign crop seeds are removed. Step 3, color sorting: The seeds selected by specific gravity are sent to the conveyor color sorter (4) through the third elevator; the conveyor color sorter (4) uses a combination of high-resolution CCD camera and LED light source to capture images of seeds passing through a single layer and compare them with the preset standard color spectrum, thereby identifying and spraying away moldy, immature or abnormally colored seeds. Step 4, Cracked Seed Removal: The color-sorted seeds are fed into the feed hopper of the magnetic crack removal machine (5); first, the seeds are mixed with fine magnetic powder with a particle size of 5–20 μm in a low-speed stirrer at a mixing ratio of 0.15–0.25% of the seed weight, so that the magnetic powder selectively penetrates into the microcracks on the seed surface under mechanical stirring; then, the mixture is sent to the area of ​​a strong magnetic roller with a magnetic field strength of 0.3–0.5 T, and the magnetic roller rotates at a speed of 150–220 rpm to adsorb and separate the cracked seeds with magnetic powder adsorbed on the surface, thereby achieving non-destructive and precise removal; Step 5, Grading: The qualified seeds after removing cracks are sent to the grading system (6); First, the seeds are initially separated into two groups, "large seeds" and "small seeds", by a vibrating grading screen; then, the two groups are respectively sent to two precision grading machines for further precise grading into three different particle size specifications; finally, the seeds of a total of six grades are transported to the corresponding grading bins for temporary storage. Step 6, Fluidized Bed Drying and Film Formation: According to production needs, seeds of the specified grade are released from the grading chamber and sent to the coating machine for coating with a chemical or film-forming agent; the coated seeds are immediately sent to the fluidized bed dryer (7) and dried for 10-15 minutes under the action of hot air at 60-70℃ to quickly remove the surface solvent; the dried seeds are then sent to the constant temperature and humidity film-forming chamber (8) and left to stand and mature for 2-4 hours in an environment of 20-25℃ and 50-60% relative humidity to allow the seed coating agent to fully cross-link and solidify, forming a strong film layer; Step 7, Vacuum dust removal: After film formation and maturation, the seeds are sent to a vacuum dust collection device (9) via a conveyor belt. This device uses negative pressure suction and is equipped with a stainless steel filter screen with a pore size of no more than 1 mm to effectively remove loose seed coating powder generated on the seed surface during the coating process, thereby improving the smoothness of the seed surface. Step 8, Automatic Packaging: The pure seeds after vacuum de-powdering are sent to the packaging scale (10) by the fourth elevator for accurate weighing, and then sent to the automatic packaging machine to complete bag sealing. Finally, they are stacked by the palletizing equipment.

2. The efficient and clean processing technology for sunflower seeds for seed production according to claim 1, characterized in that, In step two, two gravity separators (3) are connected in parallel to the process to improve the overall processing capacity of the system.

3. The efficient and clean processing technology for sunflower seeds for seed production according to claim 2, characterized in that... In step four, the amount of fine magnetic powder used is 0.15–0.25% of the seed weight.

4. The efficient and clean processing technology for sunflower seeds for seed production according to claim 3, characterized in that, In step four, the magnetic field strength of the magnetic crack removal machine (5) is 0.3–0.5 T, and the rotation speed of the strong magnetic roller is 150–220 rpm.

5. The efficient and clean processing technology for sunflower seeds for seed production according to claim 4, characterized in that, In step six, the static curing time in the film-forming chamber (8) is 2-4 hours, the ambient temperature is controlled at 20-25℃, and the relative humidity is controlled at 50-60%.

6. The efficient and clean processing technology for sunflower seeds for seed production according to claim 5, characterized in that, In step seven, the vacuum cleaning device (9) is equipped with a stainless steel filter with a pore size ≤ 1 mm.

7. The efficient and clean processing technology for sunflower seeds for seed production according to claim 6, characterized in that, It also includes the impurity classification and collection steps: the impurities discharged from the air screen cleaner (2), gravity cleaner (3), track color sorter (4), magnetic crack removal machine (5) and grading system (6) during the entire processing are collected into the valuable impurity collection bin (11) and the non-valuable impurity collection bin (12).

8. A high-efficiency and clean processing system for sunflower seeds used in implementing the process described in any one of claims 1 to 7, characterized in that, The system includes a first elevator (1) arranged sequentially along the material flow direction, whose outlet is connected to the inlet of an air screen cleaner (2); a second elevator is arranged below the good product outlet of the air screen cleaner (2), and the outlet of the second elevator is connected to the inlet of two parallel gravity cleaners (3) through a diversion valve; a third elevator is arranged below the confluence of the good product outlets of the two gravity cleaners (3), and the outlet of the third elevator is connected to the inlet of a tracked color sorter (4); a magnetic crack removal machine (5) is immediately connected behind the good product outlet of the tracked color sorter (4); the magnetic crack removal machine (5) is connected to the... The discharge port of the graded product is connected to the inlet of the grading system (6) via a conveying device; the discharge ports of each grading bin in the grading system (6) are connected to the inlet of the coating machine via valves; the discharge port of the coating machine is connected to the inlet of the fluidized bed dryer (7) via a conveyor belt; a film-forming bin (8) is provided below the discharge end of the fluidized bed dryer (7); the discharge port of the film-forming bin (8) is connected to the inlet of the vacuum dust collection device (9) via a conveyor belt; the discharge port of the vacuum dust collection device (9) is connected to the inlet of the packaging scale (10) via a fourth elevator; the discharge port of the packaging scale (10) is connected to the inlet of the automatic packaging machine. In addition, the system is equipped with a valuable impurity collection bin (11) and a non-value impurity collection bin (12), which are selectively connected to the impurity discharge outlets of the air screen cleaner (2), gravity cleaner (3), tracked color sorter (4), magnetic crack removal machine (5) and grading system (6) through conveying pipes; pulse dust collectors (13) are installed at the dust emission points of the air screen cleaner (2), gravity cleaner (3), grading system (6), coating machine and packaging scale (10); the entire system is uniformly controlled by the central control system (14).

9. A high-efficiency, clean processing system for sunflower seeds for seed production according to claim 8, characterized in that, The two gravity separators (3) are arranged side by side and connected to the discharge port of the second elevator through an electrically controlled diversion valve to achieve material distribution and flow control.

10. A high-efficiency, clean processing system for sunflower seeds for seed production according to claim 9, characterized in that, The six grading bins in the grading system (6) are arranged in a 2×3 array. Each grading bin has an electrically controlled valve installed at its outlet. The electrically controlled valve is connected to the central control system (14) via signal.

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