ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

In order to solve the problems of low operating efficiency and poor soil cultivation effect of potato cultivators in sandy loam soil conditions, a type of plowshare potato cultivator was designed. The overall structure and working principle of the machine were described. It clarified the main view of the plow body’s contour, the establishment of the guide curve, and the change law of the angle between the horizontal element straight line and the x-axis, and using the horizontal element line method, combined with the requirements of potato field tillage operation and dynamic analysis, the plow body structure parameters and their ranges that affected the effect of soil plow operation were determined. Based on the EDEM discrete element simulation technology, a component-soil simulation model was established. The soil height and soil fragmentation rate were used as test indicators. The tangent angle at the upper end of the guide curve, the initial element line angle, and the element line angle difference were the test factors, and the simulated quadratic orthogonal rotation regression test was carried out. Field experiments were conducted on the basis of simulation. The test results showed that the plowshare potato field cultivator developed had the soil crushing rate of 94.7%, the soil height of 8.4cm, the working depth was 13.6cm, the root depth stability coefficient was 92.1%, and the fuel consumption was 14.6kg/hm2, which was significantly better than the shovel type potato field cultivator’s operating efficiency and results, and satisfied the operating requirements of the potato field cultivator.