The rotary drum granulator plays an important role in industrial production, and its unique equipment principle is the key to achieving efficient granulation.
The rotary drum granulator is mainly composed of a rotary drum, a transmission device, a feeding system, a spraying system, and other parts. After the equipment is started, the transmission device drives the drum to rotate at a stable speed.
The feeding system evenly feeds the pre treated powdered material into the rotating drum. At this point, the material inside the drum starts to move upwards along the inner wall of the drum under the action of centrifugal force and friction force. After reaching a certain height, it falls back to the bottom due to gravity, forming a continuous cyclic motion.
During the process of material movement, the spraying system begins to take effect. The spraying system evenly sprays adhesive or an appropriate amount of water onto the material. Adhesive is like glue, which binds small powder particles together. As the drum continues to rotate, these small particles that have already begun to adhere continue to roll and collide, continuously adsorbing the surrounding powdery materials and gradually forming larger particles.
The internal structural design of the drum also has a significant impact on the granulation process. The drum is usually equipped with a scraper, which continuously lifts the material and forms a parabolic motion trajectory inside the drum. In this way, the material can come into more complete contact with the binder, while also increasing the chance of collision between materials, which is conducive to the formation and growth of particles.
Operators can control the size and shape of particles by adjusting some key parameters. For example, the rotational speed of the drum is an important factor. When the speed is fast, the movement speed of the material inside the drum increases, the residence time is relatively short, and the formed particles are smaller and more uniform; When the speed is slow, the material has more time to aggregate and grow, and the particles will be relatively larger. In addition, the spraying amount and concentration of the adhesive also need to be precisely controlled according to the characteristics of the material and production requirements. If too much adhesive is sprayed, the particles may become too large and prone to clumping; Insufficient spraying may lead to difficulty in forming particles.
The rotary drum granulator is like this. Through clever equipment design and collaborative work of various parts, it utilizes the movement of materials in the rotary drum, the action of binders, and the adjustment of key parameters to achieve efficient conversion from powdered materials to granular products, providing strong support for industrial production.