The paper covers the results of the theoretical and experimental investigation of the developed sectional operating element of a flexible screw conveyer designed for transporting bulk agricultural materials. In order to determine the correlation between the design parameters of the hinged screw sections and the minimum permissible radius of curvature of a processing line, the analytical dependences have been deduced. The results of the experimental studies aimed at determining the efficiency of a screw conveyer and the level of the grain material damage depending on the change in design, kinematic and technological parameters of an operating element are presented.
Paper presents feasibility study for verification of the hypothesis of improving the productivity of reload operations using screw conveyors with rotary casings. For this purpose, an experimental installation was developed and experimental studies were conducted. Research results fully confirmed the hypothesis. On the basis of a feasibility study of casing rotation in screw conveyors, the conveyor performance increased by 24%, with the conveyor capacity thereby increased by 4.5%. Due to the application of rational parameters of the screw conveyor with a rotary casing, overall economic factor was improved by more than 10%. To achieve the economic efficiency of reload operations using screw conveyors with rotary casings, the rotational frequency of the casing should range from 460 to 620 rpm.
The article presents a new design of a hinged and sectional working body and substantiates its optimal parameters for ensuring the movement of loose materials along curvilinear routes. Analytical dependencies have been derived to determine the rational design and power parameters of the hinged-sectional working body, and the functional dependencies of the minimum permissible radius of curvature of the RC technological highway on the angular rotation of adjacent sections and their design parameters have been established. The axial speed and power of cargo transportation by the articulated-sectional working body of the screw conveyor along a curved route have been determined. Experimental studies have been conducted to determine the influence of the number of revolutions, the height of material lifting and the radius of curvature of the flexible helical sectional working body RC on the torque T, as well as the determination of the influence of the number of revolutions n, the filling factor of the main line ψ and the diameter of the main line D on the performance Q when transporting loose materials.
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