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In oil well drilling mud solids control system, presently we use mechanical agitators, but majority will use hydraulic agitators also. The mechanical agitator is combined with transfer device, shaft and impeller.Different type mud agitators will have different function, such as moving agitators, tube type agitators, swing agitator. Moving agitator contains two rotation type. Including self-rote according to itself bearing center, and the revolution subject to tank center.