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 new type of chain-spoon type garlic precision seed-metering device was designed to solve the problem of the high missing rate of the previous devices. The overall structure and working principle of the seed-metering device were explained and analyzed, the design of its key components was optimized, the working process of the seed-metering device was analyzed, and the key factors affecting its operational performance were identified. A single-factor simulation test based on EDEM-RecurDyn coupled simulation was conducted to investigate the effects of active sprocket rotational speed, seeding chain inclination in the seed-filling zone, and seed layer’s height on the seeding performance. Besides, a quadratic regression orthogonal rotational combination simulation test was carried out with the active sprocket rotational speed, seed layer’s height, and seeding chain inclination angle as test factors and the single seed picking rate, missing rate, and replay rate as test indicators. A regression model of the evaluation indicators and test factors was established, and the parameters of the test factors were optimized. The test results showed that the best performance was achieved when the active sprocket rotational speed was 23.1r/min, the seeding chain inclination angle was 67.6°, and the seed layer’s height was 301.5 mm. At this time, the rate of single seed-picking was 92.5%, the missing rate was 2.5%, and the replay rate was 5.0%. Bench tests were carried out to verify the seed-metering device’s operational performance, and the results generally agreed with those predicted by the regression model. This study provides a reference for the optimized design of chain-spoon type garlic precision seed-metering device and its key components.