Like drawing 1, concaves assembly is composed of adjustment sleeve, concave, while mantle assembly is composed of main shaft, mantle head, mantle. Transmission part is composed of pulley, shaft, pionion and gear. 1. Frame 2. Pulley 3. Shaft 4. Pionion 5. Gear 6. Main shaft 7. Spring 8. head 9. Mantle 10. Concave 11. Adjustment sleeve 12 ...