槽轮式补饲机颗粒动力学数值模拟与试验

为研究槽轮式补饲机颗粒饲料的排料特性，采用Hertz-Mindlin 无滑动接触模型，分析颗粒的碰撞接触力和阻尼力，建立颗粒饲料的平动运动和滚动运动方程，并采用离散元方法，数值模拟槽轮转动时颗粒群的速度分布、运动规律及单个颗粒与槽轮中心轴的距离，定性描述槽轮转速对颗粒速度分布、带动层厚度、槽轮充满系数的影响。采用临沂永澳700和永澳997颗粒饲料对四槽轮式补饲机的排料特性进行试验，得到槽轮充满系数随着槽轮转速的增加而减小，并且槽轮转速对充满系数有显著影响。同时，进行四槽轮补饲机的定比例和定量投料试验，经检测，投料计量误差最大值为1.13%，最小值为0.56%，平均计量误差为0.83%，颗粒饲料的掺混质量良好。

Particle Kinetic Simulation and Experiment for Flute-wheel Feeding Machine

With the aim to research the pellets discharge characteristics of flute wheel feeding machine, the Hertz-Mindlin no slip contact model was used to analyze the contact force and damping force between interacting particles, and then the translational motion and rolling motion equations for pellet feed were established. By using discrete element method, particles velocity distribution, law of particles motion and the distance from a single particle to central axis of flute wheel were simulated, and the effects of flute wheel speed on particles velocity distribution and thickness of drive layer were analyzed. Discharge characteristic experiments of four flute wheel feeding machine were done by using Linyi Yongao 700 and Yongao 997 pellets. According to the experimental results, conclusions were drawn that the filling coefficient of flute wheel was decreased with the increase of rotation speed, and the flute wheel speed had a significant impact on filling coefficient. Meanwhile, the fixed proportion and fixed weight feeding experiment of four flute wheel feeding machine was carried out, the testing result showed that the maximum measurement error of feeding was 1.13%, the minimum error was 0.56%, the average error was 0.83%, and the blend quality of pellet was good. In conclusion, four flute wheel feeding machine can meet the precise feeding, and also it can meet the automatic mixing of a variety of fine pellets. Compared with the screw conveyor feeding machine, the flute wheel feeding machine has advantages in simple mechanical structure, synchronous metering discharge, effective particles impingment mixing and high speed discharge.