割草机切割压扁装置运行参数优化与试验

发布时间：2018-05-26 09:01

本文选题：割草压扁机 + 虚拟样机　；参考：《农业机械学报》2017年10期

【摘要】：为了降低收获过程中的牧草损失,选择最佳的割草压扁机设计参数,对割草压扁机割刀转速和压扁辊转速及其匹配对苜蓿收获质量的影响进行了研究。利用ADAMS软件对割台和植株进行了虚拟样机建模,并利用模型进行了苜蓿植株的切割喂入试验,通过收获过程中割刀与植株平均接触力、压扁辊与植株平均接触力、输送时间等仿真数据,拟合其随割刀转速和压扁辊转速的变化趋势和方程,定义了评判割草机对植株破坏程度的碎草系数并建立了模型。根据碎草系数模型,当割刀转速ng=1 875 r/min,压扁辊转速ny=749 r/min时,割草压扁机对苜蓿植株的破坏最小。利用田间试验对碎草系数与实际碎草率的相关关系进行了验证,两者的决定系数R2=0.958 76。通过碎草系数预测的最低碎草率约为8.38%,比原始样机减少了3.97个百分点,由此可使鲜苜蓿增收约0.47 t/hm2,比原始样机产量提高了4.53%。
[Abstract]:In order to reduce the loss of forage in the harvesting process, the optimum design parameters of the mower flattening machine were selected, and the effects of cutting speed, flattening roll speed and their matching on the harvest quality of alfalfa were studied. The virtual prototyping model of cutting table and plant was established by ADAMS software, and the cutting and feeding experiment of alfalfa plant was carried out with the model. The average contact force between cutter and plant and the average contact force between flattening roller and plant were obtained by means of the average contact force between cutter and plant during harvest. The simulation data such as conveying time were used to fit the changing trend and equation with the rotation speed of cutter and flattening roll. The breaking coefficient of grass was defined and a model was established to judge the damage degree of grass mower to plant. According to the model of shredding coefficient, when the speed of cutter is ng=1 875 rmin and the speed of flattening roll is ny=749 r/min, the damage to alfalfa plant is minimum. A field experiment was conducted to verify the correlation between the breaking coefficient of grass and the actual sloppiness. The determining coefficient of the two factors was R20.958 / 76. The lowest crashing rate predicted by the coefficient of grass shredding is about 8.38 percent, which is 3.97 percent less than the original prototype. As a result, the fresh alfalfa revenue can be increased by about 0.47 t / hm ~ (2), and the yield of alfalfa is increased by 4.53 percent as compared with the original prototype.
【作者单位】：中国农业大学工学院;
【基金】：公益性行业(农业)科研专项经费项目(201203024) 现代农业产业技术体系建设专项资金项目(CARS-35)
【分类号】：S817.111

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