Design and Test of Wheel-spoon Type Precision Seed-metering Device for Chinese Herbal Medicine Pinellia ternata
Abstract
To solve the problems of seed filling difficulty and seed damage caused by the irregular shape and damaged epidermis of Pinellia ternata seeds, based on determining the physical properties of Pinellia ternate seeds, a kind of wheel-spoon type precision seed-metering device for Chinese herbal medicine Pinellia ternate with was designed, through the force analysis of seeds in the seed filling area and the seed clearing area, the working principle of the wheel-spoon type precision seedmetering device was expounded. The number of spoons, the rotation speed of seed wheel, the seed layer height, and the seed spoon hole radius of the seed-metering device were analyzed for the discrete element single factor simulation test. For the quadratic regression orthogonal rotation combined bench test, the rotation speed of seed wheel, the seed layer height, and the seed spoon hole radius were chosen as the test factors, and the qualified index, multiple index, and the missing index were taken as the test indexes. Regression models of three test indexes were established during the experiment. Experimental results showed that the primary and secondary factors affecting the qualified index was the rotation speed of seed wheel, the seed layer height, and the seed spoon hole radius. For the seed spoon hole radius of 7.5mm, the rotation speed of seed wheel of 17.0~19.0r/min, and the seed layer height of 123.0~133.0mm, the qualified index was more than 95.5%, and the missing index, the multiple index were less than 1.0% and 3.5%, respectively. The experiment results further proved that the wheel-spoon type precision seed-metering device for Chinese herbal medicine Pinellia ternata could fully meet the requirements of Pinellia ternate planting.
Keywords: Pinellias ternata, precision seed-metering device, wheel-spoon type
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