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

Based on the analysis of existing mechanical rolling shutter technology in solar greenhouse, the rear fixed type rolling shutter machine was selected as research object. The existing problems of the machine were analyzed and the solution was found, and the rear fixed type rolling shutter device in solar greenhouse was designed. The device was comprised of four parts of rope traction device, including coiling and uncoiling device, driving device and self-locking device. Besides, the layout scheme of rope traction device and movement mechanism of key devices were analyzed, which included coiling and uncoiling device and reducer. Finally, the designed rear fixed type rolling shutter device was proved, which indicated that it was better than the existed one by contrast experiment and the structure principle of rear fixed type rolling shutter device by test of physical model. According to the data of the test of physical model, the test errors and error source were analyzed. According to the comparison of physical model and actual production situation and calculation of the test data, the performance data of rear fixed type rolling shutter device was proved to be accorded with the performance requirements of the rolling shutter machine in the NY/T 2205—2012 technical specification for quality evaluation of greenhouse rolling shutter machine, which was issued by Ministry of Agriculture in China. The feasibility of the device was further validated. The design and experiment of rear fixed type rolling shutter device in solar greenhouse had improved the applicability of rear fixed type rolling shutter machine, provided technical support for its promotion within a larger scope, facilitated the production of planting crops in solar greenhouse and improved the production benefit.