Description: Conical double screw mixer has two asymmetric tilt screws, double helix itself rotate, so to lift the material, and revolute along the center axis by a revolving gearbox drive, 360 degree mixing material, with non-destructive stirring and fast and No residual discharge characteristics.The device uses the arc structure at the top, to avoid cleaning dead ends,pneumatic spherical valve, central shaft spray, the inner surface of the mirror treatment, the outer surface of the matte treatment, erection of manhole, observation door, vent etc.