当设计农业机械而作力学分析时,首先须对作用于农业机械上的有效阻力(生产阻力)加以研究。作用在农业机械上的有效阻力主要有下列几种: 一、作用于耕地机械、整地机械、播种机械开沟装置以及中耕机械等切土器械上的土壤阻力。 二、作用于收获机械切割器械上的作物茎杆的阻力(抗剪强度),以及作用于脱粒 When designing agricultural machinery for mechanics analysis, it is first necessary to study the effective resistance (production resistance) acting on the agricultural machinery. Effective resistance on agricultural machinery mainly in the following categories: First, the role of arable land machinery, land preparation machinery, sowing equipment, trenching machinery and soil cutting machines and other soil cutting machine resistance. Second, the role of mechanical harvesting machinery on the crop stalks resistance (shear strength), and the role of threshing