Calculation of the ejection of a cotton lump from the pin surface of a long-pin drum
Keywords:
raw cotton, heavy impurities, stone catcher, long-pin drum, cotton particle, moisture content, motion trajectory, airflow, pneumatic conveying, guide wall, separation efficiencyAbstract
The paper presents a theoretical study of the separation and subsequent motion trajectory of cotton particles released from the pins of a long-pin drum in a device designed for the efficient removal of heavy impurities from raw cotton. The effects of cotton particle mass and moisture content, aerodynamic resistance, and operating parameters of the long-pin drum on particle motion were investigated. A system of differential equations describing the motion of a cotton particle was developed, and changes in its mass and motion trajectory with increasing moisture content were analyzed. Based on the calculated results, recommendations were developed for selecting the distance between the axis of the long-pin drum and the guide wall. The analysis showed that, when processing raw cotton with relatively high moisture content, a distance of approximately 900 mm is advisable. The proposed design solution can reduce cotton losses and improve the efficiency of heavy-impurity separation.
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