Desenvolvimento e analise de um dosador mecanico vertical para semeadora de precisão

AUTOR(ES)
DATA DE PUBLICAÇÃO

1999

RESUMO

Many crops require precision planters, and most of them available in the brazilian market use the horizontal disk for seed metering which has, in general, low precision. With the objective of exploring alternative and more efficient seed metering principles, it was developed a mechanical device, for a precision planter. This seed metering device has designed using a vertical disk, with a diameter of 318mm, with cells in its periphery to hold the seeds. To eliminate the excess of seeds in the cells, and to eject the seeds, a rotating circular cleaner and a stationary positive ejector were used. The design parameters tested were: smooth and grooved disks, horse hair brush and rubber cleaners, position of the cleaner at 0º, 15º, 30º and 45º from the vertical axis in the rotation direction, transmission ratios between cleaner and disk of 1:2,125 1:3,4 and 1:5,2; and speeds of 0,56; 1,11; 1,67; and 2,22 m/s. The performance of the seed metering device was evaluated considering the longitudinal distribution uniformity and damage to seeds. The variables double, single and empty spacings; seed spacing?s coefficient of variation; physical, physiological and total damage, were used. The tests were done on a greased belt, using soybean seeds. The best performance was obtained with the smooth disc and brush cleaner with the following ranges: normal spacings 56 and 94%, coefficient of variation 61 and 26% and total damage 3,8 and 1,4%. The distribution uniformity and physical damage decreased with increased speeds

ASSUNTO(S)

agricultura - mecanização maquinas agricolas

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