Authors

Abstract

Optimization and experimental research on the cutting parameters of the cutter were carried out to solve the high re-cutting rate and loss rate under high-speed harvesting of alfalfa disc-type cutter. Kinematics theory was used to analyze the movement trajectory and cutting area of the cutter in the cutting process, and theoretical calculations to carry out an analysis of the factors affecting the re-cutting area of the cutter. A working parameters adjustable cutting test bench was designed and produced, and cutting experiments of alfalfa were conducted using this test bench combined with response surface methodology. The optimized factors combination was solved by quadratic fitting function, and the value of cutterhead diameter, blade twist angle, and cutting inclination angle was 407.04 mm, 4.21°, and 4.51°, respectively. The verification test showed that the average re-cutting rate and loss rate were 1.48% and 3.13%, less than national standard requirements for alfalfa harvesting quality (re-cutting rate <1.5%; loss rate <4%), low-loss cutting of alfalfa was achieved, and the harvesting quality of the disc-type cutter was improved.

Abstract in Chinese

针对圆盘式苜蓿切割器高速收获下重割率及损失率高的问题，开展了切割器切割参数优化与试验研究。运用运动学理论分析了割刀切割过程中的运动轨迹及切割区域，通过理论计算进行了切割器重割面积影响因素分析。设计并搭建了一款作业参数可调切割试验台架，结合响应曲面试验方法，利用切割试验台架开展苜蓿田间收割试验。利用二次拟合方程求得最优参数组合为刀盘直径407.04 mm、割刀扭转角4.21°、切割倾角为4.51°。验证试验结果表明，最优参数组合下平均损失率为3.13%、平均重割率为1.48%，实现了苜蓿的低损失切割，提升了圆盘式切割器高速收获下的作业质量。