How to adjust the gap between the biomass pellet machine's rollers?
Correct adjustment will increase the production capacity of the biomass pellet machine, extend the service life of the roller and the ring die, thereby reducing the production cost, saving production costs and improving the economy. In general, the rotation direction of the ring die of the biomass pellet machine is clockwise. For example, for a biomass pellet machine equipped with two rollers, when installing the rollers, the eccentric convex edge of the left roller should be installed in the upper left half of the ring die, and the eccentric convex edge of the right roller should be installed in the lower right half of the ring die; if there are multiple rollers in the biomass pellet machine, it should also be ensured that when the eccentric adjustment block rotates in the opposite direction of the ring die, the roller should move in the direction of contact with the ring die, otherwise it means that the roller is not installed correctly and should be reinstalled according to the above requirements.
| Model No. | Capacity(kg/h) | Power(kw) | Weight(t) |
| RKL-250 | 100-200 | 15 | 0.5 |
| RKL-300 | 150-250 | 22 | 0.65 |
| RKL-350 | 100-300 | 30 | 0.76 |
| RKL-400 | 300-600 | 37 | 2.2 |
| RKL-450 | 500-800 | 55 | 4.3 |
| RKL-550 | 1000-1500 | 90 | 5.5 |
The gap between the roller and the ring die of the pellet machine is generally 0.3mm~0.5mm. When adjusting, the outer surface of the roller is usually slightly in contact with the inner surface of the ring die, and it is almost rotating when the main shaft rotates. Under normal circumstances, the gap between the two is smaller for a small die hole, and larger for a large die hole; the gap between the new die is smaller, and the gap between the old die is larger; if the gap between the roller and the ring die is too small, the roller and the ring die are easy to wear, and the noise is relatively large. On the contrary, a large gap will cause difficulty in discharging.
However, the roundness of the mold and roller will generally be slightly deformed after heat treatment. When adjusting, the outer diameter of the roller should be in contact with the small inner diameter of the ring die. The gap is still 0.3mm~0.5mm. This kind of adjustment is usually called jump contact adjustment. Never use the small outer diameter of the roller to contact the inner diameter of the ring die for adjustment. If so, once the outer diameter of the roller contacts the small inner diameter of the ring die, additional radial force (impact load) will be generated, and abnormal metal friction sound will occur.
