Vibrations in engineering and technology

Baranovsky Viktor – Doctor of Technical Sciences, Professor, Professor of the Department of Engineering of Machine Building Technologies, Faculty of Engineering of Machines, Structures and Technologies of Ternopil Ivan Puluj National Technical University. https://orcid.org/0000-0002-7332-1783

Karp Ivan – postgraduate student of the Department of Mechanical Engineering Technologies of Ivan Pulyuy Ternopil National Technical University e-mail: ivankarpv@gmail.com. https://orcid.org/0009-0002-6137-3911

Post-harvest processing of grain materials (drying, impurity separation, seed treatment, etc.) is a critical stage in ensuring the required quality standards and preparing grain for storage and subsequent use as seed material, for baking production, or for feed mixtures. In this context, screw conveyors are widely used at agricultural grain-handling facilities for transporting moist grain, as they represent structurally simple and relatively low-maintenance conveying mechanisms that enhance the overall technological efficiency of grain production and utilisation chains in the agricultural sector. The aim of this study was to develop empirical models describing the functional variation of conveying capacity and power consumption during the transportation of wheat grain by a screw conveyor with variable pitch of the helical flights. Based on planned factorial experiments, regression equations were obtained to describe changes in conveying capacity and power consumption as functions of the hopper outlet area, screw rotational speed, and wheat grain moisture content at three values of the variable flight pitch (5, 8, and 11 cm). It was established that, within the investigated ranges of input factors – hopper outlet area from 10 to 40 cm², screw rotational speed from 120 to 280 rpm, and wheat grain moisture content from 12% to 18% – the approximated values of conveying capacity and power consumption vary as follows: Pitch 5 cm: 5–46 kg·min⁻¹ and 77.6–180 W; Pitch 8 cm: 10–63 kg·min⁻¹ and 107.8–220.6 W; Pitch 11 cm: 20–75 kg·min⁻¹ and 97.5–231.5 W. The discrepancy between theoretical and experimental values ranged from 10–15% for conveying capacity and 13–18% for power consumption. The obtained results contribute to the further development of methodologies for optimising rational parameters of screw conveying processes

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