РЕЗУЛЬТАТЫ ПОИСКОВЫХ ИССЛЕДОВАНИЙ ТРИЕРА С АВТОРЕГУЛИРУЕМЫМ СКОРОСТНЫМ РЕЖИМОМ РАБОТЫ

Abstract

The research methodology for the process of screen cleaning of grain mixtures in an autoregulated mode and the results of exploratory experiments are presented. Favorable conditions for its flow - full loading of the cellular surface with a grain mixture along the length and a minimum of grain yield of the main crop are confirmed by the basic criteria for the quality of the technological process. The average level of residual weediness was 0.0019%, and the average level of technological losses was 0.042%. It has been established that the duration of the experiments of 3.5 minutes is insufficient for an objective assessment of the productivity of the trier (W) and the degree of separation of the impurity component (C). During this time, W amounted to only 91.4% of the supply (Wp) of the grain mixture to the trier, and Sv did not exceed 70% due to the incompleteness of the stage of stabilization of the technological process. The descent variation coefficient was 18%. It is proposed to increase the duration of the experiments up to 20 min due to the multiple circulation of the working medium in a closed circuit when the scraper conveyor is included in the experimental equipment. Calculations confirmed the maximum multiplicity of circulation of the working medium, equal to 4.3, with a distributed mass of grain in a closed technological circuit of 332 kg. Based on the assumption of an increase in the cumulative total of residual contamination (R0) with the circulation of the working medium, the error in reproducing the conditions of experiments in terms of R0 will be 0.0027–0.008% over the entire range of initial contamination Rm = 1–3%. Sampling, according to the estimation of Zo, should be carried out every 120 s, and the estimated duration of sampling increases with a decrease in Wp and Zi in the range of 6-54 s. At the same time, the presence of 2-3 impurity particles in the sample is guaranteed when the trier operates at the optimal speed mode (nopt). The number of impurity particles in samples will increase at high speeds. It is proposed to paint impurity particles in contrasting colors (blue, black) to reduce the complexity of sampling.