农业工程学报Issue(5)：12-18,7.DOI:10.3969/j.issn.1002-6819.2013.05.002
柔性齿与刚性齿脱粒水稻功耗比较分析与试验
Analysis and test of power consumption in paddy threshing using flexible and rigid teeth
摘要
Abstract
The study and use of flexible threshing teeth are of interest to researchers in agricultural mechanization because flexible teeth appear to damage grain less than rigid teeth. For a flexible threshing tooth, consisting of an elastic beam fixed on one end, a differential equation of its deformation curve was created, the deformation of which was calculated by numerical methods, which provided necessary condition for dynamic analysis. The corresponding formulation of calculating power consumption was deduced based on theoretic analysis in this paper. The hypothesis was as follows:the threshing roller was regarded as rigid body, the threshing teeth as elastic bodies, and threshing as the impact between threshing teeth and paddy rice. The differences in impulse moment and beating force for paddy grain between the rigid threshing tooth and the flexible one were analyzed and compared, and their respective power-consumption models were established in this paper. By analyzing the loss of kinetic energy and impact momentum for the threshing processing using the rigid threshing tooth and the flexible one, we concluded that the loss of kinetic energy of flexible threshing was less than that of rigid threshing;likewise, power consumption by flexible-tooth threshing is less than that by rigid-tooth threshing if the feed rates and the rotary speed are equal. <br> Meanwhile, the theoretical analysis results show that the beating force of the flexible tooth was less than that of the rigid tooth, which was confirmed experimentally. Experimental data showed that the threshing roller has to have a sufficiently high moment of inertia, and the engine enough power, to preserve the stability of the threshing process. We fabricated a number of experimental devices including a transducer for measuring torque, an apparatus to measure angular velocity, and a feeding test-bed. Experiments were conducted by measuring torsion and angular velocity, enabling us to compute the brake power of flexible-tooth and rigid-tooth threshing, respectively. There is an optimal value of tooth length that minimizes power consumption but that is unique for each kind of tooth.关键词
农业机械/试验/模型/柔性齿/刚性齿/脱粒功耗/脱粒水稻Key words
agricultural machine/experiments/models/flexible tooth/rigid tooth/power consumption/paddy threshing分类
农业科技引用本文复制引用
任述光,谢方平,罗锡文,孙松林..柔性齿与刚性齿脱粒水稻功耗比较分析与试验[J].农业工程学报,2013,(5):12-18,7.基金项目
国家自然基金项目资助(编号:51175173) （编号:51175173）
