National Academy of Agricultural Sciences (NAAS)
|
PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Physical and frictional properties of groundnut seeds play an essential role in designing a seeder in order to decide cell size, shape, thickness of metering disc and material, inclination of seed hopper. The present study aimed to determine the physical and frictional properties of groundnut seeds of three varieties viz., VRI 8, CO 6 & TMV 7. Length, breadth, thickness, roundness, thousand seed weight, geometric mean diameter, sphericity were evaluated for designing metering disc of seeder. Bulk density, true density, angle of repose, coefficient of restitution and coefficient of static friction were evaluated for designing seed hopper of seeder. Cell diameters and thickness of the seed metering discs were designed based on the maximum breadth and length of seeds. Seed flow through the various components of the seeder was affected by both roundness and sphericity. Roundness of VRI 8, CO 6 and TMV 7 were 0.49, 0.47 and 0.53respectively, while sphericity in the natural rest position of these seeds were 0.71 ± 0.05, 0.70 ± 0.09 and 0.73 ± 0.09respectively. The slope of the seed hopper was fixed at 30â°, which is moderately higher than the average angle of repose of seeds for ensuring free flow of seeds. Mild steel sheet of material grade Fe 410 and 18 gauge i.e., 1.214mm thickness is selected for seed hopper in reference to the coefficient of static friction to other materials (Al, GI, SS & wood). In addition, the inner bottom surface of the seed hopper from where the seed enters into metering disc was imbedded with 3mm thick rubber sheet as its coefficient of restitution was lower than mild steel sheet of same thickness at different heights. It was observed that the average coefficient of restitution values of three varieties (VRI 8, CO 6 & TMV 7) were 5.0, 1.8, 1.2, 1.2, 1.3&1.4times lower in rubber sheet compared to MS sheet at the heights of 50, 100, 150, 200, 250 & 300 mm respectively.
Citations |
 |
 |
 |
 |
