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

Aiming at the problems such as serious soil adhesion, large traction resistance, a press device in mechanical type reducing adhesion and resistance was designed according to the method of terrain machines reducing adhesion and resistance. The movement process of press device was analyzed. The suppression device, scraping angle to take off the soil, and soil compaction mechanism analysis were done. The mechanism analysis can provide theoretical basis for the design of the press device, and based on that the key components of press device was designed. For the study performance of press device in mechanical type reducing adhesion and resistance, the spring stiffness coefficient, speed and scraping angle were taken as experimental factors, traction resistance, soil adhesive quality were taken as test indexes. The orthogonal test L9(34) was conducted in the indoor soil bin for getting test factors affecting the performance of press device work. Test results showed that the order of the various factors affecting were as follows: the spring stiffness coefficient, scraping angle and speed;the best combination: the spring stiffness coefficient was 40N/mm, scraping angle was 30°, and speed was 7km/h. To the optimal level combination of verification experiment: traction resistance was 39.6N, and soil adhesive quality was 43.24g. Compared with the traditional repressive device, the results showed that the press device based on scrape and vibration principle can reduce the traction resistance by 17.8% and the soil adhesion can be reduced by 34.8%.