Experimental Studies of the Operation of a String Sieve
DOI:
https://doi.org/10.32515/2414-3820.2026.56.60-69Keywords:
string screen, working length, grain separation, grain moisture content, full factorial experiment, regression equation, response surfaceAbstract
This paper is devoted to the experimental determination of the optimal working length of the string screen in a grain cleaning machine. String screens are promising separation elements due to the self-cleaning nature of their working surface, low metal content and reduced susceptibility to clogging compared to perforated screens; however, their optimal dimensions depend significantly on operating conditions.
The aim of the study was to determine the influence of grain feed rate, screen inclination angle and grain moisture content on the working length of the string screen required to complete the separation process. The study was carried out using a full factorial experiment of the PFE 23 type. The reproducibility of the results was confirmed using the Cochran criterion, the statistical significance of the coefficients using the Student’s t-test, and the adequacy of the model using the Fisher criterion.
An adequate regression equation was obtained, describing the dependence of the required working length of the sieve on the variable factors. It was established that material feed rate has the greatest influence, whilst grain moisture content and the angle of inclination of the sieve have a lesser influence. It was found that an increase in all factors impairs the grain sieving process, increasing the required working length of the sieve. The results can be used to justify the design parameters of string screens in grain cleaning machines.
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Copyright (c) 2026 Mykhailo Kryshko
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