DEVELOPMENT OF DRAPER SEPARATOR FOR DECORTICATED GROUNDNUTS
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Date
2019
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Indira Gandhi Krishi Vishwavidyalaya, Raipur (C.G.)
Abstract
There are various methods and devices for cleaning of grain, the inclined draper separator is one of them to separate the grain from thrashed mixture without using blowing air. The inclined draper separator senses a difference in shape and surface texture to separate seed from shell . A mixture to be separated, was metered onto the centre of an inclined draper belt travelling towards uphill direction. Round and smooth seeds, which roll down on the draper was faster than the draper is travelling up, which was separated in one side. Shell was carried to the top and dropped into another side. Belts with different degrees of roughness were used as the draper. The rate of feed was kept slow enough to allow each seed to act individually. The angle of incline was set to give surety for proper separation of kernels.
Mostly in manual operated low cost groundnut decorticator, the cleaning system are not provided. In conventional method separation of grain or kernels from the mixture is performed by blowing high speed air, which causes great air pollution . This air pollution needs to be reduced. Therefore this work was aimed to develop conceptual design of a unit for separating kernels from the decorticated mixture, without using blowing air which leads in air pollution.
So this research was conducted to develop a cleaning solution for decorticated groundnuts for separation of shell and kernels. The developed draper separator employed a conveyor belt made of different frictional material to take advantage of surface texture. Experiment was conducted to show the effect of different feed rate, conveyor belt speed and conveyor deck angle on cleaning efficiency. Cleaning efficiency was determined by analysis of measured seed loss, separated shell and shell loss. Deck angle settings shown largest impact on cleaning efficiency.
In experimentation it was found that in developed draper separator the velvet material was found better over carpet and jute material, further the detailed study with velvet material was conducted for best suited deck angle, conveyor speed and feed rate. Higher deck angle (27°) give significantly higher cleaning efficiency. Conveyor belt speed have not shown much effect on separation as deck angle. For 59 cm width of draper material economical feed rate was observed between 42 to 84 kg/h . Fabrication cost and operational cost of developed draper separator was workout which was ₹ 9085/- and ₹ 72.03/h respectively.
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