Widened grinding surface, fully optimized hammer arrangement, wonderful performance for micro grinding;  Forward and reverse work of rotor, longer service life of hammer mill;  High-precision dynamic balance detecting rotor, little vibration, low noise; Movable operating door and linkage sieve press structure, more convenient for operation and maintenance; Equipped with safety interlocking device for safety; Advanced teardrop-shaped crushing chamber design, reasonable structure of the secondary crushing, compared to other models production increased 25%; Patent shaft into the air system, small aperture material production increased more than 25%; Using the new adjustable pressure plate, adjustable back gauge device and tuning techniques, destruction of material circulation layer.