黄贮饲料收获机关键部件设计与性能试验

Structure Simulation and Performance Experiment of Yellow Corn Forage Harvester

设计了9HS-170型黄贮饲料收获机,阐述了该机的总体结构及工作原理,并对滚刀装置和抛送装置核心部件进行分析。通过对滚刀装置的理论分析得出动刀片工作圆弧段上任一点的运动轨迹均为余摆线,根据玉米秸秆的力学特性,其正常工作时动刀线速度为38.6 m/s,配合定刀完全可以对玉米秸秆进行切断粉碎,适合牲畜的咀嚼长度。应用Fluent软件对抛送装置内的气流场进行数值模拟与分析,得出叶片末端附近速度一般在35.7~42.8 m/s,抛送筒中存在二次流,抛送装置设计合理、性能良好。对整机进行了田间试验,试验结果表明,9HS-170型黄贮饲料收获机安全性能和操作性能良好,在地表较平坦的情况下该机平均生产率为0.7 hm2/h,割台损失率为2.8%,割茬高度为87 mm,轴承温升为7℃,均达到行业标准要求。

Type 9HS-170 yellow corn forage harvester was designed and the overall structure and working principle of the machine was elaborated.The roller device and toss blower which were the core components of machine was analyzed.Trajectory of any point in circular arc section of work of moving blade was trochoidal,through the analysis of the theory of roller device.According to the mechanical properties of corn stalk,the corn stalk could be cut off to be suitable for livestock to chew in cases with fixed blade to cooperate and linear velocity of moving blade of 38.6 m/s.Moreover,peripheral speed of blade terminal was 35.7~42.8 m/s and there was secondary flow in toss tube,through numerical simulation and analysis of the air flow field of toss device by using the software of Fluent.Overall,the design of toss device was reasonable.The field experiment was conducted.The results showed that safety performance and operation performance of type 9HS-170 yellow corn forage harvester were good.The average productivity of machine was 0.7 hm2/h.The average loss rate was 2.8%.The stubble height was 87 mm.The bearing temperature rise was 7℃.