When cleaning sesame seeds, the air-screen cleaner is responsible for coarse cleaning and grading, removing light, large, and small impurities; the destoner is responsible for fine removal of heavy impurities, specifically removing stones and mud lumps similar in size to sesame seeds. The two are usually used in series, complementing each other, in the sesame seed cleaning line.
Destoner (Specialized equipment for removing heavy impurities from sesame seeds, mostly gravity destoners)
1. Core Function
Precise Destone Removal: Specifically removes heavy impurities such as stones, mud lumps, and metal fragments that are similar in size to sesame seeds but have a higher specific gravity, which the air-screen cleaner cannot remove.
Ensuring Safety and Quality: Prevents stones from damaging the equipment during subsequent processing (such as grinding and oil pressing), and avoids sand and gravel mixing into the finished product, affecting the taste and hygiene of the sesame seeds and their products.
2. Working Principle (Triple Action of Gravity + Airflow + Vibration)
Automatic Separation: Sesame seeds fall evenly onto the inclined fish-scale screen surface from the feed inlet. Under the combined action of directional airflow and reciprocating vibration of the screen surface, the material layer is “fluidized,” increasing the gaps between particles and promoting automatic gravity-based classification.
Separation Motion:
Sesame seeds (low density): Suspended in the upper layer of material, they slide down the inclined screen surface to the clean sesame seed outlet under the impetus of gravity, inertia, and continuous feeding.
Pebble/Mud (high density): Sink to the bottom, adhering tightly to the screen surface. Under the inertial force generated by the screen vibration and the support of the reverse airflow, they overcome gravity, slide upwards relative to the screen surface, and finally converge at the stone outlet for discharge.
Air Screen Cleaner (Core Equipment for Sesame Coarse Cleaning + Grading)
1. Core Functions
Air Screening for Light Impurities: Efficiently removes dust, husks, shriveled grains, straw fragments, and other impurities lighter than sesame seeds from sesame seeds.
Screening for Large/Small Impurities: Separates large impurities (such as straw and clods of soil) and small impurities (such as sand and broken grains) smaller than sesame seeds using multiple layers of screens with different apertures.
Sesame Grading: Performs preliminary grading of sesame seeds according to particle size (large, medium, and small), providing standardized raw materials for subsequent processing (such as oil extraction and roasting).
2. Working Principle (Combined Air Screening and Grading)
Air Screening Stage (Vertical Air Screen): Utilizing aerodynamic principles, sesame seeds and light impurities have different critical suspension velocities. A fan generates a stable airflow; light impurities (low critical velocity) are drawn away by the airflow and collected in a dust collector; plump sesame seeds (high critical velocity) pass through the airflow zone and fall into the lower vibrating screen.
Screening stage (multi-layer vibrating screen): Utilizing differences in geometric dimensions, sesame seeds flow on an inclined, reciprocating vibrating screen surface. Larger impurities than the screen openings are intercepted and discharged by the screen surface; smaller impurities and sand pass through the screen openings and are separated; sesame seeds that meet the specifications pass through the corresponding screen layer and flow out from the main outlet.
In a sesame cleaning production line, the air-screen cleaner and destoner are only the core impurity removal section. A complete, stable sesame cleaning line that produces high-quality oil and has a good appearance generally also includes pre-treatment, fine cleaning, conveying, dust removal, and storage equipment.
1. Magnetic Separator
Function: Removes nails, screws, and iron filings from sesame seeds, protecting the screen and subsequent equipment.
2. Primary Cleaning Equipment
Vibrating Primary Cleaner
Function: Removes large stalks, hemp ropes, clods of earth, and large stones, reducing the workload of the main cleaner.
3. Air-Screen Cleaner
Function: Removes light impurities (straw clippings, shriveled seeds, dust), large impurities, and small impurities.
4. Gravity Destoner
Function: Specifically removes adjacent stones, mud clods, and heavy impurities that air screening cannot remove.
5. Gravity Selector (Core of Sesame Fine Cleaning)
Function: Removes chaff, insect-damaged seeds, diseased seeds, broken seeds, sprouted seeds, and half-seeds, leaving only plump, good sesame seeds.
6. Sesame Dust Removal System (Dry Cleaning)
Function: Removes dust, mold, and surface dirt from sesame seeds through friction, improving color and cleanliness.
7. Color Sorter
Function: Separates moldy, discolored, diseased, and residual stones based on color, providing the highest cleaning precision.
Post time: Mar-03-2026
