Authors

Abstract

The lack of effective visualization research methods for the crushing process of grass kneading has restricted the development of grass kneading machine to a certain extent. In this paper, the hay kneading process was numerically simulated by using the discrete element method, the stem movement rule, the mechanical characteristics of the stem particle group and the power consumption of the kneading were analyzed, and the motion and breaking mechanism of the grass in the hay kneading machine were defined. The effects of motor output speed and feed rate on the spinning rate and power consumption were studied. The regression equation between test factors and evaluation indexes was established. With the goal of maximizing the silk rates and minimizing the power consumption, the motor output speed and feeding amount are optimized and solved. The optimal parameter combination is determined as follows: when the output speed of the motor is 282.88r/min and the feeding amount is 1.86kg/s, the knead verification test shows that the silk rates is 92.88% and the power consumption is 3.68kJ. The research results provide a reference for realizing high efficiency and low power consumption of grass kneading and parameter optimization of kneading device.

Abstract in Chinese

针对牧草揉丝破碎过程缺乏有效可视化研究方法，在一定程度上制约了牧草揉丝机发展进程的问题。本文以铡切揉碎协同式牧草揉丝机为研究对象，采用离散元方法对牧草揉丝过程进行数值模拟，对牧草茎秆运动规律、茎秆颗粒群力学特性、揉丝功耗进行分析，明确了牧草在揉丝机内运动和破碎机理。进行了台架多因素性能试验，研究了电机输出转速和喂入量对丝化率和功耗的影响，构建了试验因素和评价指标之间的回归方程。以丝化率最大化和功耗最小化为目标，对电机输出转速和喂入量进行优化求解，确定最优参数组合为：电机输出转速为282.88r/min、喂入量为1.86kg/s时，揉丝验证试验表明，丝化率为92.88%、功耗为3.68kJ。研究结果为实现牧草高效、低功耗揉丝和揉丝装置的参数优化提供参考。