Abstract
The article substantiates the practical application of ultrasonic range finders for studying and controlling the operation of the pneumatic separation channel of a grain cleaning machine. A new technological scheme of the installation is described, as well as the results of experimental studies aimed at finding parameters that have the greatest correlation with the supply of material and air flow to the pneumatic separation channel of the grain cleaning machine. It has been experimentally determined that the speed of the feeding roller regulating the supply of material to the pneumatic separation channel in order to fully load it and provide maximum output has a strong inverse correlation (-0.89) with the difference in the averaged values of the lengths of the paths of ultrasonic waves piercing across the moving grain layer , obtained from ultrasonic range finders at the beginning and end of the pneumatic separation channel. The rotor speed of the fan regulating the air supply to the pneumatic separation channel also has a strong inverse correlation (-0.82) with the difference in the averaged values of the path lengths of ultrasonic waves piercing across the moving grain layer obtained from ultrasonic range finders in the middle and end of the air separation channel. It is proved that at a frequency of polling the sensors 1200 ms, the quality of the evaluation of the state of the stochastic layer is the best. The developed method for controlling the supply of material and air to the air separation channel of the grain cleaning machine can be used as the basis for the automation of the grain cleaning process, it will allow to react in a timely manner to the stochastic change in the variable state of the process of cleaning the grain heaps, and as a consequence, to improve its quality and to reduce specific energy costs.
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