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

At present, the small planters that can adapt to the planting conditions of the facility greenhouses mostly use the cell wheel seed-metering device, so the seeding accuracy is low, and the seeding quality cannot be immediately known. Small pneumatic planters need to be equipped with pneumatic seed-metering device and fan, while there are design problems such as power system design, poor seed metering stability, complex structure and bulkiness of the whole machine. On the basis of the air suction seed-metering device designed previously, a fork-shaped seed divider was developed to realize narrow row spacing. The seeder would not stray meanwhile working on the ridge because the wheel having a guided effect was designed. Due to the oil-electric hybrid power system, the machine had independent power system, that meant the gas online engine provided seeder driving force as well as the electric offered the seed-metering device and draught fan power. In this way, seeding performance was improved. In terms of automation, the carrot precision seeder system of electric driving was designed based on the speed measurement method of rotary encoder. PLC was the main controller of this system. According to the advance speed message collected by rotary encoder, the speed of seeding was adjusted in real time, as well as realized the real-time matching between the speed of seeding and the advance speed of the seeder. In order to solve the monitoring problem of small grain size seeds, a monitoring system for seeding quality was developed, which can display leaky seeding number and sowing area in real time during operation. Through adopting bijective matrix fiber optic sensor monitoring the flow of seed, counting test proved the counting relative error was not more than 4.6%. On the other hand through the leaky alarm system, it was tested by plugging seed cells artificially. The test results showed that the system can effectively monitor the leakage and meet the requirements of production and use. The rotary encoder was used to measure the speed of the seeder, and the servo motor drived the seeder. The seeding control system adjusted the speed of the seeder, so that the speed of the seeder matched the advance speed of the seeder in real time, so as to realize the uniform sowing distance of the whole plot. The field experiment showed that the endurance of the battery reached 10 hours, the qualified rate of the plant spacing was more than 93.7%, the reseeding rate was less than 2.4%, and the leaky seeding rate was not more than 3.9%. The experimental result met the national relevant criterion whose sowing depth was uniform and averagely 17mm. Compared with several cognate type of carrot seeders, the reseeding rate and the leaky seeding rate were reduced, the sowing quality could be monitored in real time, the monitoring error was less than 8.4%, and the working efficiency and sowing quality were improved.