Increasing the efficiency of grain sieving on a vibrating sieve electric separator
DOI:
https://doi.org/10.31734/agroengineering2022.26.064Keywords:
seeds of grain crops, separation, vibrating grid electric separator, electric field, sieving efficiencyAbstract
One of the ways to improve the conditions for the passage of elongated components (oats, wheat, barley, rye, etc.) through the holes of the sieves is to create an electrostatic field above them. Theoretically, there is a certain initial value of the intensity of the electric field, at which the seed will start to orient itself in it. The optimum tension value will be the one at which the degree of orientation of the seeds on the oscillating sieve in the longitudinal direction will be maximum (when their longitudinal axis will be perpendicular to the sieve).
The paper describes the results of the study of the process of separation of mixtures of grain crops on a vibrating sieve electric separator and the justification of the optimal parameters of the electric field intensity E and the amplitude of oscillations A of the separator sieve.
The paper describes the results of the study of the process of separation of mixtures of grain crops on a vibrating sieve electric separator and the justification of the optimal parameters of the electric field intensity E and the amplitude of oscillations A of the separator sieve. The results of experimental studies showed that the effect of the electric field on the seeds of different crops is not the same. It manifests itself least on wheat seeds, since the number of seeds oriented in the electric field was about 50 %. For barley seeds, the studied indicator had a value of 65 %. The maximum percentage of oriented oat seeds at the maximum intensity of the electric field over the sieve of 6.67 kV/cm was about 80 % of the seeds. It was found that with an increase in the intensity of the electric field, the percentage of oriented seeds increases. This also affects the intensity of its sifting through the sieve. When the intensity of the electric field increased to the maximum value, the content of the sifted fraction of wheat in the eastern fraction decreased by 20...23 %, barley – by 20...30%, oats – by 47 %. The optimal operating parameters of the vibrating screen electric separator during the separation of grain crops will be the electric field strength in the working zone of separation Е = 5...6.5 kV/cm, and the amplitude of vibration of the screen of the experimental sample of the separator A = 1...1.5 mm.
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