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

Wide-boundary sowing pattern of winter wheat and base-fertilizer separated layer application technology have good value for extension and application. In order to promote the integration of agronomy and agricultural machinery, a winter wheat separated layer fertilization-sowing planter combined machine and a set of precision fertilizer-seed metering control system matched with the combined machine were developed. Firstly, the overall structure of combined machine was determined, and its layered delivery mechanism of seed and fertilize, depth limiting mechanism, three-point suspension mechanism and compacting mechanism were designed and elaborated. The installation angle of depth limiting mechanism was set to be 15°, and then the horizontal distances between material’s outlet orifice of layered delivery mechanism and the center of rotary tiller was increased by 115mm, which could reduce the influence of soil and straw on the normal rolling of depth limiting mechanism. Moreover, the suspension point on the traditional three-point suspension mechanism was transformed from spherical pair to moving pair, which could keep the longitudinal beam of layered delivery mechanism parallel to the ground at all times, and then improve the stable seed and fertilizer delivery depth of the combined machine. Secondly, a set of precision fertilizer-seed metering control system matched with the combined machine were developed, and then the key hardware of control system, such as embedded host, electrical control model of hydraulic motor, attitude discrimination method of machine and driving speed analysis module were also determined. Moreover, the system control model was proposed and the operation software interface of embedded host was designed. The combined machine with precision fertilizer-seed metering control system could accurately control discharge of deep fertilizer, shallow fertilizer and seed. Finally, totally 15 indexes of the combined machine with precision fertilizer-seed metering control system were tested and evaluated by a third party inspection agency inspection. The test results showed that all technical indexes of the combined machine met the specified performance requirements, and the combined machine could satisfy agronomic and agricultural machinery technical requirements of rotary tillage, separated layer fertilizer application and wide-boundary sowing of winter wheat.