to the barrel mouth automatically. The controller sends out filling signal when the gun of the filling scale drops to the right position, the valve door of the filling door opens, the material flows into the filling barrel in high-speed. When the filling quantity arrives at the fast-forward quantity, the controller of the filling scale sends out the signal of slow material-input signal, closes the fast material-input valve door, and open the slow material-input valve door. At this time, the mate