What are the structural components of a rotary drum granulator?

A rotary drum granulator is a core piece of equipment in the production of compound fertilizers, organic fertilizers, and metallurgical auxiliary materials. With its high granulation rate and wide adaptability, it is widely used in large-scale production. Its scientifically designed structure, with each component working in concert, determines the granulation efficiency and granule quality. The core structure mainly consists of four parts: the main unit, the transmission system, the feeding and discharging system, and the auxiliary system. Each part has a clear division of labor and works closely together.

The main unit is the core working component of the rotary drum granulator, mainly including an inclined rotating cylinder (drum body) and a baffle ring. The drum body is welded from high-quality medium carbon steel plates, and the inner wall is usually lined with rubber plates or acid-resistant stainless steel plates to prevent material adhesion and provide corrosion protection. Some models also have lifting plates to lift the material and achieve uniform dispersion. The tilt angle of the drum body can be adjusted from 3° to 8° to control the material residence time and ensure granulation effect. The baffle rings are located at both ends of the drum body, which not only prevent material backflow and leakage, but also increase the material layer thickness and extend the material residence time at the discharge end.

The transmission system provides stable power for equipment operation and is the "heart" of the entire machine. It mainly consists of a motor, reducer, pulleys, and gear sets. The motor drives the reducer via pulleys and V-belts, and the reducer, in turn, meshes with a large gear ring on the cylinder through the gear set, driving the machine to rotate at a uniform speed. All transmission components are made of wear-resistant and corrosion-resistant materials to ensure stable operation. The cylinder speed can be controlled between 5-15 r/min via frequency conversion adjustment to adapt to different material granulation requirements.

The feeding and discharging system is responsible for material conveying and separation, including belt conveyors, chutes, and screens. Material is fed into the cylinder via belt conveyors and chutes, consisting of fresh and recycled material. The screen at the discharge end separates qualified granules from unqualified fine powder; unqualified material can be returned to the feeding end for regranulation, achieving resource recycling.

In summary, the various structures of the rotary drum granulator work together, with the main unit responsible for core granulation, the transmission system providing power, and the feeding and discharging system ensuring material flow. Together, they constitute an efficient and stable granulation device, providing reliable support for large-scale production.

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