This question raises the key control points of the operation of the disc granulator. The disc speed directly determines the efficiency, size, and strength of particle formation, and is one of the core parameters affecting the granulation effect.

The disc speed mainly affects the following four key granulation indicators by changing the motion state of the material inside the disc:

1. Particle size: When the rotation speed is too high, the material is subjected to strong centrifugal force and is thrown out of the disc before it can grow, resulting in small particles as the main finished product; When the rotation speed is too low, the material movement speed is slow, and the particles will continue to bond and grow, easily forming large particles or even clumping.

2. Particle strength: When the rotational speed is moderate, the material repeatedly rolls and squeezes inside the disc, resulting in a denser internal structure and higher strength of the particles; Excessive rotation speed can cause particles to "accelerate", resulting in weak internal bonding, low strength, and easy breakage; If the rotation speed is too low, the number of particle rolling times is insufficient, and it is also difficult to form high-strength particles.

3. Particle formation rate: When the rotational speed is within a reasonable range (usually corresponding to different machine models), the material can stably form particles that meet the requirements, and the particle formation rate can reach over 90%; Deviation in rotational speed can result in excessive fine powder (too high rotational speed) or large particles (too low rotational speed), leading to a significant decrease in particle formation rate.

4. Production efficiency: Excessive rotation speed will result in short material retention time. Although a single batch is produced quickly, there are many unqualified particles, resulting in low actual effective efficiency; If the speed is too low, the material will stay in the tray for too long, resulting in a decrease in unit time output and overall production efficiency.

Key Adjustment Logic: How to Match Speed

The speed is not a fixed value and needs to be adjusted according to actual working conditions. The core logic has two points:

Match with disc diameter: The larger the diameter of the disc, the lower the rotational speed is usually. For example, a 2.5m diameter disc with a rotational speed of approximately 13-15r/min; A small disk with a diameter of 0.5m can rotate at a speed of up to 30-35r/min. This is to ensure that the edge linear velocity (material movement velocity) of disks with different diameters is within a reasonable range.

Match with material characteristics: For materials with high viscosity (such as wet organic fertilizers), the rotational speed should be reduced to avoid particles sticking and clumping too quickly; Loose and flowable materials (such as dry powder) can be appropriately increased in speed to promote rapid particle formation.