The main structure of the organic fertilizer drum granulator is an inclined rotary cylinder, which can be driven at a constant or variable speed. When the liquid content of the feed powder is appropriate, coagulation occurs and rolls in the rotary drum. The rotary drum has a certain slope, and the angle between its axis and the horizontal is below 10 °, which can assist the material in rolling along the length direction of the drum. A material blocking ring is often installed at the feeding end to prevent material backflow.
A stopper ring can also be installed at the discharge end to increase the thickness of the material layer and extend the retention time in the main drum. In other situations, a spiral discharge ring is often used to transport the boring material to the screen at the rear end of the drum. Sometimes a cylindrical sieve is integrated with a rotating drum to form a product discharge port.
The feed consists of fresh and recycled materials, and the feeding system can use belt conveyors, chute pipelines, or other similar equipment. Adhesive liquid can be injected before the solid material enters the rotary cylinder, or immediately after the solid enters the rotary cylinder.
Like a disc granulator, the surface structure of the inner surface of the drum plays a crucial role in determining whether the material can react well within the drum. The interior of a steel drum is usually made of thermally expanding metal. The function of various internal scrapers is to maintain a certain thickness of the material on the inner surface of the rotary drum, making the material layer uniform and facilitating normal rolling and flipping of the material inside the rotary drum. Rubber baffles, linings, and external vibrators are used to prevent accumulation during fertilizer granulation.