落花生果莢系統機械物性之研究

Abstract

為設計良好的脫莢機構以解決落花生脫莢之損傷問題，落花生果莢系統之機械物性需要加以測定。在此研究中以物性分析方法探討影響落花生果莢系統機械物之主要因子。試驗結果顯示落花生果莢物性與重量並無顯著相關。果莢系統所能承受之作用力與受力之應力集中點都受到含水率的影響。作業速率並不影響作用力。果莢切斷能量因品種，栽培時期……等因素而不同。果莢切斷能受含水率之影響先增加而後減少。子房柄切斷能隨含水率之減少而急劇減少，此物性分析結果可用以解釋落花生脫莢機構對脫莢性能之影響。 In order to design an acceptable threshing mechanism to reduce damaged peanuts, physical properties of peanut peg-pod systems need to be tested. In this study, the factors affecting physical properties of peg-pod systems are analyzed. The experimental results indicate that physical properties have no correlation with the pod weight and the loading rate. The sustaining forces and force concentration positions are affected by peanut moisture contents. The pod cutting energy varies with peanut varieties and planting periods. The pod cutting energy reaches maximum at the medium moisture content (20~30% w. b. ) of pod. The peg cutting energy rapidly decreases as the peg moisture content decreases.