Metodologia de projeto de suspensão pantografica para corte de base de cana-de-açucar / Project methodology of pantographic suspension for sugar cane base cuter
AUTOR(ES)
Guilherme Ribeiro Gray
DATA DE PUBLICAÇÃO
2008
RESUMO
In spite of been the world leader in sugar-cane production, Brazil have low indexes of harvester mechanization of sugar-cane. The sugar-cane harvesting involves five simple operations, that are the cut of the stems in the base and in the top, feeding of the stems for the interior of the harvester, remove the leaves and the cutting the stem in billets which is optional. However today there is a lack of processes to make these operations in an efficient way. The base cut used in the conventional harvesters is made of double disks positioned in the inter row, however it is not adapted for the furrow planting system used in Brazil, and since it does not present capability of independent flotation for each disk it implicates in the movement of a great amount of soil. The absence of this mechanism increasing the indexes of mineral material in the raw material, which implicates in the reduction of the technological quality of the raw material supplied for grinding and cane losses in the field, besides requesting high power to cut and to move the soil volume. This research project had for objective to design, to simulate, to build and to evaluate in soil bin a pantographic suspension of a sugar-cane base cutter to be used in a harvester semimechanized system (mechanical-aid). The simulations were accomplished using the computational program Matlab® allowing the determination of the suspension spring stiffness and its initial deformation in order to guarantee the flotation of the mechanism on the soil profile. Such condition can be obtained when soil-skidder interaction force is maintained in a minimum but never null. The suspension projected was built and mounted in soil bin for evaluation in a soil sine wave profile amplitude of 25 mm and 50 mm and length of 1,5 m. The results shows that the designed mechanism accomplishes its objectives satisfactory with errors between 8,5 mm and 9,1 mm for the harvester forward of 0,14 m.s-1 and 0,42 m.s-1 respectively
ASSUNTO(S)
maquinas agricolas agricultura - mecanização agricultural machines simulation colheita simulação por computador harvestin-aid
