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3. 球磨机的生产工艺
球磨机一般以固定转速运行,筒体的转速是由皮带轮或齿轮减速机构(也有用液力耦合器)决定的。球磨机的转速直接影响到钢球和物料的运动状况及物料的研磨过程,在不同的转速下,筒体内的钢球和物料的运动状况
(a)当转速较低时,钢球和物料随筒体内壁上升,当钢球和物料的倾角等于或大于自然倾角时,沿斜面滑下,不能形成足够的落差,钢球对物料的研磨作用很小,球磨机的效率很低。
(b)当筒体的转速处于上述二者之间的某一转速时,钢球被带到的高度后沿抛物线落下,对筒底物料的撞击作用大,研磨效率高,此时的转速称为佳工作转速。
(c)如果筒体的转速很高,由于离心力的作用,以致使物料和钢球不再脱离筒壁,而随其一同旋转,这时钢球对物料已无撞击作用,研磨效率则更低。这种状态的低转速称为临界转速。
实际运行表明,工作转速与钢球的直径及其装载量、护甲形状,钢球与护甲之间的磨擦系数等因数有关。一般的工作转速通常为临界转速的0.7~0.8,可见转速还是有的可调范围,但调节范围不大。实际球磨机的转速与工作转速的误差小于10%,所以若球磨机采用变频调速搜索工作转速,提高研磨效率的节能效果也在10%以内。
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