The stator is a partially biased circular column stick, inside which there is a material trough and two hot medium channels for heating and heat insulation. The material enters the material trough and is discharged by the metering bar. The two hot medium channels use heat conducting oil or hot water or steam, which prevents material in the trough from solidification. The stator can rotate ±10°to adjust the dropping angle , thus achieving high quality grain shape. The stator can also rotate ±90° to install high and low viscosity metering bars. The rotation of the stator is controlled by the joystick at the stator end.