Drum granulator is a granulation equipment commonly used in industries such as fertilizers and chemicals. Its working principle involves the synergistic effect of multiple physical processes and mechanical structures.
The core component of the rotary drum granulator is the rotary drum, which is made of sturdy metal and connected to a motor through a transmission device. The motor provides stable rotational power to the rotary drum. After the device is powered on and started, the drum starts to rotate at a set speed at a constant speed.
Powdered materials enter the drum through the feeding port. During the rotation of the drum, materials are affected by various forces. Centrifugal force causes the material to tend towards the inner wall of the drum, while frictional force causes the animal material to crawl upwards along the inner wall of the drum. The combined effect of these two forces creates a complex motion trajectory for the material inside the drum, constantly circulating between the bottom and top of the drum.
At the same time, the spraying system installed above the drum began to work. The spraying system evenly sprays the prepared adhesive solution in a mist form onto the materials inside the drum. The function of a binder is to reduce the surface tension between material particles, increase the attraction between particles, and thus enable the originally loose powder material particles to bond together.
As the drum continues to rotate, the small particles bonded together by the adhesive continue to roll and collide, continuously adsorbing the surrounding powdery materials. The plate inside the drum plays an important auxiliary role, as it continuously lifts the material, causing it to form a parabolic motion in the air. During this process, collisions between materials become more frequent, giving particles more opportunities to adsorb new materials and gradually grow.
During the granulation process, several key factors can affect the quality and shape of the particles. The rotational speed of the drum is one of the important factors. The speed of rotation directly determines the movement speed and residence time of materials in the drum. If the speed is too fast and the material stays in the drum for too short a time, the particles may not be able to grow sufficiently; If the speed is too slow, it will affect production efficiency. In addition, the spraying amount and concentration of the adhesive also need to be precisely controlled. The appropriate amount of adhesive can ensure that particles will neither loosen due to insufficient bonding nor clump due to excessive bonding.
The rotary drum granulator efficiently converts powdered materials into granular products through the rotation of the rotary drum, the movement of materials, the action of binders, and the assistance of plate copying, providing reliable technical support for the production of related industries.
