The stirring time is related to the type of mixture being stirred, the speed of the end of the runner and the type of agitator used. When the perweek velocity of the leaf tip is v.3 to 2.5m/s, the interval stirring time should be: 0.5 to 1.25min, and the continuous stirring time should be 1.5 to 3min, the low value is coarse-grain mixture, the high value is the sand grain mixture. When coarse particle mixture is stirred, it is usually v.5 to 1.8m/s, and the stirring time is greater than the lower limit, which can reduce the driving power and reduce the wear of the friction element.
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