Experimental study on adsorption characteristics of small irregular seeds
Aiming at the requirements of irregular small diameter seeds selection and fine sowing,three kinds of seeds with different shapes of malabar spinach,wheat and cucumber were selected as test objects to conduct experimental research on the air suction seed extractor.The influences of nozzle shape,seed weight,nozzle diameter,aperture ratio,adsorption pressure and nozzle speed on maximum pressure,ultimate pressure,zero particle adsorption rate,single particle adsorption rate and multiple particle adsorption rate were analyzed.The experimental results showed that the established linear regression equation of maximum pressure could better estimate the maximum pressure under different nozzle diameters and rotating speeds.The established linear regression equation of ultimate pressure could better estimate the seeds of malabar spinach and wheat,but could not estimate the seeds of cucumber.Weight had little effect on the single particle adsorption rate of three kinds of seeds,which could be ignored in general.The adsorption pressure had a greater effect on the single particle adsorption rate of malabar spinach and wheat seeds,but had a lesser effect on cucumber seeds.The diameter of the nozzle had a great effect on the single particle adsorption rate of the three kinds of seeds.The rotation speed of the nozzle had a greater effect on the single particle adsorption rate of wheat seeds,but had a lesser effect on malabar spinach and cucumber seeds.The optimal single particle adsorption rate parameters of the three types of seeds were determined as follows:the maximum single particle adsorption rate of malabar spinach seed was 99.17%when the adsorption pressure was 15 kPa,the diameter of the suction nozzle was 2.0 mm and the rotation speed of the suction nozzle was 16.875 r/min.The maximum single particle adsorption rate of wheat seed was 98.33%when the adsorption pressure was 15 kPa,the diameter of the nozzle was 2.0 mm and the rotation speed of the nozzle was 16.875 r/min.The maximum single particle adsorption rate of cucumber seed was 95%when the adsorption pressure was 15 kPa,the diameter of the nozzle was 1.0 mm and the rotation speed of the nozzle was 20.625 r/min.
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