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

A drone seeding device was designed to address the problem of scattered and disorderly seed falling caused by the widespread use of diffuse sowing in rice and rapeseed aerial seeding, which can simultaneously meet the agronomic requirements of rice and rapeseed aerial seeding. The design goal was to achieve dual use, lightweight, electric drive, and modularization of the strip aerial seeding system. The external groove wheel component with electric drive and adjustable working length was used as the seeding device, and the automatic folding seed guide tube driven by the linkage driven by the servo was used as the seeding component. Through bench tests, on-site mud box aerial seeding tests, and field tests, the structural and working parameters were determined and the operational effect was verified. The test showed that the designed seed metering system can meet the agronomic requirements of 6~7.5kg/hm2 oil rape, 15~45kg/hm2 hybrid rice and 60~105kg/hm2 conventional rice at maxium flight speed of 5m/s when in the range of rated speed and torque of seed metering motor, and the performance parameters such as the coefficient of variation of consistency of each row and the coefficient of variation of consistency of total discharge capacity were superior to the requirements of the industry standard. At height of 1m and speed of 4m/s, the average strip width of rapeseed and rice seeds in the mud box was 6.7cm and 3.8cm, respectively. The effect of seedling formation in the field was significant after 30d of sowing.