1. Varies kind of flail knife, moving trace is same as the potato ridge shape and width
2. Aligned on knife roll shaft in double spiral shape which guarantee the force is evenly distributed on the roll shaft.
3. Overrunning coupler is equipped on both side , which effectively protect the transmission system
4. Flail knife rotating in high speed forms negative pressure
which enables to cut off the lodging straw.
5. High efficiency, high grinding effect.