After a series of tests of the vertical screw mixer the following conclusions were obtained:1. As the time goes on the variation coefficient CV of the mixed material was rapidly decreased, 4 seconds later, the value of CV becomes less than 10%.

• 机组的混合机经试验得出如下结论: 1.；随着混合时间的延长；混合物的变异系数CV值迅速下降；4分钟后CV值稳定在10%25以下。