Multi-layer kinematics and collision energy in a large-scale grinding mill-the largest semi-autogenous grinding mill in China
Multi-layer kinematics and collision energy in a large-scale grinding mill-the largest semi-autogenous grinding mill in China
复制标题
大型磨机——国内最大的半自磨机的多层运动学和碰撞能
DOI：
10.1177/1687814016681371
复制
发表时间：
2016-12-01
影响因子：
2.1
通讯作者：
Chang, Xiangdong
中科院分区：
文献类型：
--
作者：
Li, Tongqing;Peng, Yuxing;Chang, Xiangdong
以中国公司最大的半自磨机为模型，在钢球多层运动学的基础上进行了碰撞能分析。首先，考虑钢球的多层特性，得到钢球的运动学方程。其次，根据内层钢球的运动学特性，对其碰撞能进行了求解。最后求出了单位时间内的总碰撞能量。结果表明，随着磨机速比的增大和半径比的增大，脱模角度减小，但脱模速度呈线性增加。此外，切向碰撞速度的间断点出现在角度因子β=0处，并且角因子b被分为两个区间：[-3，0]和[0，1.5]。在这两个区间内，切向速度等于0的离散角分别为1.185和0.7854拉德。另外，当b小于零时，碰撞总和速度增大，当b大于零时，碰撞总和速度急剧减小。最优磨速比对应的磨机转速的84.2%时，单位时间的总碰撞能量最大。
Using the largest semi-autogenous grinding mill in China as a model, collision energy was analyzed on the basis of the multi-layer kinematics of the steel balls. First, the kinematic equation of the steel balls was obtained by considering the multi-layer characteristics of the steel balls. Second, the collision energy of the inner-layer steel balls was addressed according to its kinematic characteristics. Finally, the total collision energy per unit time was obtained. Results show that the leaving angle decreases as the mill speed ratio increases and as the radius ratio increases, but the leaving velocity increases linearly. Moreover, a discontinuity point of the tangential collision velocity occurs at an angle factor beta = 0, and the angle factor b is divided into two intervals: [-3, 0] and [0, 1.5]. The leaving angles corresponding to a tangential velocity equal to zero are calculated to be 1.185 and 0.7854 rad in the two intervals. In addition, the sum collision velocity increases when b is less than zero, but it decreases sharply above zero. The maximum total collision energy per unit time occurs at 84.2% of the mill speed corresponding to the optimal mill speed ratio.