Development and Selection of Spoons for Metering Device of Onion Bulblets Planter

Abstract

Engineering properties of onion bulblets of variety Agrifound Dark Red were determined for development of metering device of onion bulblets planter. The raw sample of onion bulblets was graded in three groups as small, medium and larger size sample according to their diameters (Polar and equatorial). The engineering properties like polar diameter, equatorial diameter, unit weight, geometric mean diameter, sphericity, shape factor and bulk density of onion bulblets of each sample size were determined at 74.00 % m. c. (w. b.) and found as 23.62 mm, 13.2 mm, 1.87 mm, 15.58 mm, 0.66, 0.56 g, 607.82 kg/m3 respectively for small size sample, 27.9 mm, 19.54 mm, 3.91 mm, 21.30 mm, 0.70, 0.70 g, 664.47 kg/m3 respectively for medium size sample and 31.58 mm, 28.71 mm, 5.70 mm, 28.64 mm, 0.91, 0.91 g, 685.60 kg/m3 respectively for large size sample. The angles of repose for small, medium and large size sample were found to be 36.200, 34.210 and 33.510 respectively and values of rolling angle were as 10.21⁰, 10.25⁰ and 10.45⁰ for small, medium and large size samples respectively. The values of shape factor were found as 0.56 (oblate in shape), 0.70 (oblate in shape) and 0.91(spherical in shape) for small, medium and large size sample onion bulblets respectively.

Tehnička svojstva crnog luka su određena radi razvoja mernog uređaja za sadilicu luka. Sirovi uzorci su bili podeljeni u 3 grupe: mali, srednji i krupni. Osobine su: polarni i ekvatorijalni prečnik, težina, sferičnost, factor oblika i rasuta gustina. Uglovi mirovanja za male, srednje i velike veličine uzorka su 36.200, 34.210 i 33.510, a vrednosti ugla kotrljanja su bili 10.21⁰, 10.25⁰ i 10.45⁰ za male, srednje i velike uzorke veličine respektivno. Vrednosti faktora oblika su bili 0.56, 0.70 i 0,91 za male, srednje i velike uzorke, respektivno.