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 the mechanical replugging task in greenhouse, the residual matrix in plastic pan would not be beneficial for healthy seedling replugging which was caused by the endeffector removing bad seeding in previous transplanting procedure. A kind of spade endeffector was developed relatively to the needletype for the removing task. The aim was to reduce the residual matrix in the cell by increasing the contact area between the endeffector and matrix. The reasons of residual matrix in the endeffector grabbing procedure were deduced by the statics. The seedling pot would break and the matrix would collapse while the maximum cohesion in matrix was less than the total resistance which was synthesized by the gravity of seedling pot and the adhesion between the matrix and plug tray. Based on the discrete element analysis method, the seedling pot grabbing procedure by the spade endeffector was simulated by the enhanced discrete element method (EDEM). It was found that the performance of residual matrix was reduced while the cohesion of soil matrix was increased. Therefore, taking the matrix ratio and relative moisture content as the main factors and designing the experiment through the combined disc tests to measure the matrix adhesion and cohesion in the different main factors of matrix ratio and relative moisture. The aim was to find the conditions of matrix ratio and relative moisture while the cohesion was bigger than adhesion. The difference between cohesion and adhesion was the largest under the conditions of 60% of relative moisture content and 6∶3∶1 (peat∶vermiculite∶perlite) of matrix ratio. The average matrix removal rate by the spade endeffector reached 70.8%, which was superior to other conditions. Most of the matrix in the plastic hole can be removed under the conditions.