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 view of lack of special mechanical harvesting equipment, a rotary cutter disc flat stubble cutting device of King grass harvester was designed. According to the biological characteristics of King grass and the harvest requirements of flat stubble cutting, the overall structure design of the cutting device was completed. Through theoretical analysis, the key structures and working parameters of cutter and conveyor were determined. ANSYS/LS-DYNA was used to simulate and compare the cutting effects of single moving knife cutting and moving fixed knife combination cutting. The results showed that the flatness of cutting section with moving and fixed cutter was better than that with single moving cutter. When the cutter head was cutting at low speed, the cutting power consumption of the combination of moving and fixed cutter was less than that of single moving cutter. The conveyor had good conveying effect and can realize the continuous stubble conveying of King grass stalk after cutting. The cutter test-bed was built. Through NSGA-Ⅱ algorithm, the optimal parameter combination of cutter was determined: the blade clearance was 2.98mm, the cutter head speed was 84.7r/min, and the cutter head inclination was 28.65°. Under this parameter combination, the stubble breaking rate was 8.66% and the unit cutting power consumption was 7.78mJ/mm2. On this basis, the field experiment was carried out, and the experimental results were basically consistent with the optimization results. The results showed that the overall harvest quality was better when the rotary cutter disc flat stubble cutting device was applied to the harvest of King grass.