Experimental setup for studying the efficiency of mixing bulk materials by screw working bodies with additional elements
DOI:
https://doi.org/10.32515/2664-262X.2026.14(45).11-21Abstract
Homogenization of bulk media is a fundamental technological process in the food, chemical, construction and agricultural industries. The modern vector for increasing the technical and economic efficiency of this process is the integration of mixing and moving operations by introducing screw conveyors-mixers. Modernization of screw conveyors by implementing innovative structural elements is aimed at intensifying the process of homogenization of bulk media. Establishing a correlation between modifications of working bodies and qualitative indicators of mixing exclusively by analytical methods is difficult due to the high complexity of mathematical modeling of multiphase systems, which does not allow achieving the necessary predictive accuracy. In view of this, conducting full-scale experimental studies using specialized bench installations is of priority. Designing and testing such stands allow for verification of theoretical provisions, as well as establishing rational structural and kinematic parameters of screw working bodies equipped with additional intensifier elements to optimize combined transportation and mixing processes.
The purpose of the work is to describe the design of the developed and manufactured experimental installation for research and selection of rational parameters of the process of simultaneous transportation and mixing of bulk materials by screw working bodies with additional elements.
The installation allows to substantiate the rational parameters of the equipment functioning and to assess the efficiency of mixing multicomponent mixtures. It includes a three-section hopper, which allows to conduct research on the heterogeneity of mixing of two- and three-component mixtures, and has the ability to regulate the speed of pouring of individual components. The experimental installation also provides the ability to change the angle of inclination of the screw conveyor branch in the range from 0 to 60 degrees, the speed of rotation of the screw working body in the range from 0 to 1400 rpm, as well as to study the quality of mixing of bulk materials by screw working bodies equipped with additional elements, in particular L-shaped elements with a height of 10, 20 and 30 mm. The main design parameters of the studied screw working body with additional elements are as follows: screw diameter – 96 mm (respectively, the outer casing – 106 mm and the inner casing – 100 mm); screw height – 25 mm; screw pitch – 62 mm; number of turns on the screw – 12.5; number of additional L-shaped elements – 33. The design of the experimental installation is equipped with an Altivar 71 frequency converter, which provides the ability to control the speed of rotation of the screw equipped with mixing elements and collect the necessary experimental data in a personal computer. The Altivar 71 frequency converter is controlled from a personal computer using the PowerSuite software, which allows you to study the productivity of the process of simultaneous transportation-mixing of bulk materials, drive power consumption, torque on the shaft of the installation's electric motor, and also, after measurements, the coefficient of heterogeneity of the mixtures obtained.
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