In sesame processing, stones are typical “heavy impurities.” Due to their high hardness and density, they not only wear out subsequent grinding and oil-pressing equipment but can also affect the taste and safety of sesame products such as sesame oil and sesame paste. The destoner, by precisely utilizing the material’s physical properties, has become a key device for removing stone impurities from sesame seeds. Its operating logic revolves around “specific gravity differences” and “motion trajectory separation,” and its specific principles can be divided into three key steps.
1. Core Logic: Utilizing “Specific Gravity Difference” to Achieve Material Separation
The core physical difference between sesame seeds and stones lies in their specific gravity. The Taobo destoner exploits this difference. Through the combined effects of an inclined screen surface, vibration, and airflow, the sesame seeds and stones are naturally separated during movement. The core component of the equipment is the inclined, multi-hole screen (the screen holes have a diameter slightly smaller than the sesame seeds, typically 1.5-2.0mm, to prevent them from leaking through). During operation:
Vibration drive: The screen surface generates high-frequency, small-amplitude reciprocating vibrations via an eccentric shaft or a vibrating motor, directed downward along the screen surface.
Airflow assistance: A fan installed below the screen surface blows a uniform upward airflow, which passes through the screen holes and acts on the sesame seeds and stones.
Stratification effect: The combined effects of vibration and airflow lift the lighter sesame seeds, forming a “suspended” upper layer on the screen surface. This layer then slides downward along the inclined screen surface. The heavier stones, however, cling to the screen surface because the airflow cannot overcome their gravity and are then rolled upward along the screen surface’s inclination due to the vibration. This creates a stratification effect where the sesame seeds slide downward and the stones roll upward.
2、Separation Process: Directional Guidance Achieves “Precise Stone Separation”
After separation, the sesame seeds and stones are directed to different outlets through the equipment’s structural design for final separation. This process requires no manual intervention, achieving automated stone removal.
Sesame Seed Movement: Sesame seeds suspended in the upper layer, driven by vibration and gravity, continuously slide downward along the inclined screen surface, ultimately exiting the “clean material outlet” at the bottom of the screen for further processing.
Stone Movement: Stones clinging to the screen surface continuously roll upward due to the combination of vibration direction and screen tilt. Upon reaching the “impurity-rich zone” at the top of the screen, they are separated from the screen surface through a dedicated “stone discharge channel” (e.g., baffle guidance and reverse airflow), discharged through the “stone discharge outlet,” and land in a collection bin.
3. Adaptation and Optimization: Customized Design for Sesame Characteristics
Sesame seeds are small (approximately 2-3mm in diameter), lightweight, and easily crushed. Therefore, destoners must be optimized for these characteristics to avoid issues like sesame being blown away by airflow or stones becoming stuck. Key optimization points include:
Screen surface protection: The screen surface is made of stainless steel and has a polished surface to reduce friction between the stones and the screen surface, preventing them from becoming stuck.
Multi-stage stone removal: For sesame seeds with high levels of impurities, some equipment utilizes a two-stage screen. The first stage removes large stones, while the second stage removes finer, crushed stones. This achieves a stone removal rate exceeding 98%, ensuring the safety of subsequent processing equipment and product quality.
Our Taobo destoner precisely utilizes differences in specific gravity to efficiently address the problem of stone impurities in sesame seeds through an automated process of “stratification – guidance – separation.” This destoner is a critical line of defense for ensuring the quality and safety of sesame products and a key piece of equipment driving the transition from manual extensive processing to mechanized precision. The equipment operates automatically and can operate 24 hours a day, making it suitable for large-scale processing.
Post time: Sep-05-2025
