1. Original design of double reducer ensures balanced drive,reduces power consumption and operates with adjustable speed. 2. The improvement of open door shaft and link mechanism ensures the angel of openning door is larger than 90° (the materials can't fall on the door) close door which is deadlocked. 3. The improvement of discharging door structure enlarge sealed gearing face,better sealing without feed leakage. 4. Special design return air system ensures air current balance in all-dimensional feed in materials. 5. Advanced adding and spraying system could be added many kinds of liquid and solid at the same time,precision spraying and convenient control.