Desempenho da colhedora de milho Penha CLM-350: parte II - sistemas de debulhamento e limpeza
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Data
1977-01-01
Autores
Furlani Jr, J.A. [UNESP]
Guimarães Jr, J.B.
Balastreire, L.A.
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Editor
Universidade de São Paulo (USP), Escola Superior de Agricultura
Resumo
Com a finalidade de quantificar o desempenho dos sistemas de debulhamento e limpeza da colhedora Penha CLM-350,, estudou-se as perdas percentuais era grão de milho, ocorridos na saída de palhas, bem como a porcentagem de impurezas, presente no milho ensacado. Tomando-se como 100% os grãos de milho colhidos pelo sistema espigador, determinou-se o valor percentual perdido pelos sistemas de debulhamento e limpeza, bem como a porcentagem de impurezas presente nos grãos de milho ensacado, nos diversos tratamentos estudados. O teor médio de umidade foi de 15,78% (b.u.). Os tratamentos correspondentes ao sistema de debulhamento e limpeza são as velocidades periféricas do debulhador ou as rotações do aspirador em faces da configuração geométrica da máquina. Os resultados obtidos foram estudados através da análise de variância, empregando-se os testes F, aos níveis de 1% e 5% de probabilidade e o teste Tukey, para a comparação estatística entre as médias. A análise estatística para verificar a influência da rotação do aspirador, era relação a porcentagem de grãos de milho perdidos na saída de palhas, mostrou diferenças altamente significativas, podendo-se admitir uma relação direta entre os dois parâmetros nas condições do ensaio. Com relação a rotação do aspirador e a porcentagem de impurezas, presentes nos grãos de milho ensacados, os testes das médias revelaram significância entre os tratamento D (1241,7 rpm) e E (820 rpm) sendo que este último apresentou a maior média. Uma análise mais acurada dos resultados sugere que a porcentagem de impurezas, estaria mais na dependência das relações de fluxo através da colhedora, do que propriamente do regime do aspirador.
With the aim of quantifying the shelling and cleaning systems performance for the Penha CLM-350 harvester, the percentage of loss of corn kernels, which octirred in the straw outlet was determined, as well as, the percentage of debris, in the packaged corn. Taking the corn kernels harvested by the snapping rolls as 100%, the percentage of loss from the shelling and cleaning systems were determined, as well as, the percentage of debris in the packaged corn for the various treatments. The average moisture content for the corn was 15,78% (w.b.). The corresponding treatments for the shelling and cleaning systems are the tangencial velocity of the shelling cylinder, or the angular velocity of the aspirator considering the geometric configuration of the machine. The analysis of variance with the F tests at 1% e 5% probability level were used to analyse the data, and Tukey's test was used for comparison between means. The statistical analysis showed that the angular velocity of the aspirator, related to the percentage of loss in the straw outlet, was highly significant, making possible the assumption of a linear relationship between the two parameters for the testing conditions. The comparison between means showed that the percentage of debris in the packaged corn were significant for the treatments D (1241,7 rpm) and E(820 rpm), the last one with the higher mean. A more accurate analysis of the data sugests that the percentage of debris, would depend more on the material flow through the harvester, than the rotation of the feeding auger.
With the aim of quantifying the shelling and cleaning systems performance for the Penha CLM-350 harvester, the percentage of loss of corn kernels, which octirred in the straw outlet was determined, as well as, the percentage of debris, in the packaged corn. Taking the corn kernels harvested by the snapping rolls as 100%, the percentage of loss from the shelling and cleaning systems were determined, as well as, the percentage of debris in the packaged corn for the various treatments. The average moisture content for the corn was 15,78% (w.b.). The corresponding treatments for the shelling and cleaning systems are the tangencial velocity of the shelling cylinder, or the angular velocity of the aspirator considering the geometric configuration of the machine. The analysis of variance with the F tests at 1% e 5% probability level were used to analyse the data, and Tukey's test was used for comparison between means. The statistical analysis showed that the angular velocity of the aspirator, related to the percentage of loss in the straw outlet, was highly significant, making possible the assumption of a linear relationship between the two parameters for the testing conditions. The comparison between means showed that the percentage of debris in the packaged corn were significant for the treatments D (1241,7 rpm) and E(820 rpm), the last one with the higher mean. A more accurate analysis of the data sugests that the percentage of debris, would depend more on the material flow through the harvester, than the rotation of the feeding auger.
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Anais da Escola Superior de Agricultura Luiz de Queiroz. Universidade de São Paulo (USP), Escola Superior de Agricultura, v. 34, p. 609-617, 1977.