Authors

Abstract

In view of the problems of low efficiency, poor crushing quality and inapplicability to high water content forage, the cutter and crusher rotor of hammer type forage grinder was designed, the cutter and crusher process was analyzed theoretically, and the parameters of cutter and crusher rotor were determined. The modal analysis of the cutting and crushing rotor was carried out by ANSYS Workbench to verify the rationality of the rotor structure. The alfalfa with water content of 65% was taken as the processing object, and the quadratic orthogonal rotation combination test was carried out with the output speed of motor, sieve diameter and feeding amount as the test factors, and the productivity and silking rate as the evaluation indexes. Through the analysis of variance and target optimization of the test results by Design-Expert 12.0 software, the regression equation between the test factors and the evaluation index was obtained. With the goal of maximizing the productivity and silking rate at the same time, the output speed of the motor, the diameter of the sieve and the feeding amount were solved by multi-objective optimization, and the optimal parameter combination was determined as follows: The output speed of the motor is 443.77r/min, the diameter of the sieve is 14mm, and the feeding amount is 1.27kg/s. The verification test shows that the productivity is 5065.98kg/h, and the silk rates is 94.87%. The device has high crushing efficiency, good quality, and can crush high water content forage, which meets the design requirements of forage mill.

Abstract in Chinese

针对现有的牧草粉碎机效率低、粉碎质量差、对高含水率牧草不适用等问题，对锤片式牧草粉碎机的铡切和粉碎转子进行了创新设计，对铡切和粉碎过程进行了理论分析，确定了铡切和粉碎转子的参数。利用ANSYS Workbench对铡切和粉碎转子进行了模态分析，验证转子结构的合理性。将含水率为65%的苜蓿作为加工对象，进行了以电机输出转速、筛孔直径、喂入量为试验因素，以生产率和丝化率为评价指标的二次正交旋转组合试验。通过Design-Expert 12.0软件对试验结果进行了方差分析及目标优化，得到了试验因素与评价指标之间的回归方程，以生产率和丝化率同时最大化为目标，对电机输出转速、筛孔直径、喂入量进行多目标寻优求解，确定最优参数组合为：电机输出转速443.77r/min、筛孔直径14mm、喂入量1.27kg/s，验证试验表明，生产率为5065.98kg/h、丝化率为94.87%；该装置粉碎效率高、质量好，而且能够粉碎高含水率牧草，满足牧草粉碎机设计要求。