Overarm granulator with special screw design and various configurations for auxiliary extruders, suitable for the regeneration and color blending granulation of various plastics such as PP, PE, PS, ABS, PA, PVC, PC, POM, EVA, LCP, PET, PMMA. The reducer features high torque design for noiseless and stable operation. The screws and barrels are treated with special hardening, offering excellent wear resistance, mixing performance, and high yield. The design of vacuum exhaust or normal exhaust outlet ensures the removal of moisture and waste gases during the production process, leading to more stable discharge, firmer granules, and guaranteed product quality.