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介绍了三组筛分机械的发展动向，摆振筛在于驱动系统的对称布置；回转筛在于筛网的有效运动；自由振动筛在于形成良好的空间非线性曲线
The development trend of three sets of screening machinery is introduced. The shimmering screen lies in the symmetrical arrangement of the driving system. The rotary screen lies in the effective movement of the screen. The free-vibration screen forms a good non-linear curve of space