Major causes of pellet mill roller sticking are bearing damage, an improper die-roller gap, raw material problems, and foreign matter inside the equipment. For example, roller bearing damage and failure typically result in overheating of the bearing mounting area, noise during operation, and significant vibration in the machine body, which can even prevent the roller from rotating properly and cause it to become stuck. An improper die-roller gap, such as an excessive gap between the ring die and the roller, can prevent the roller from rotating and cause machine blockage. A too small gap between the die and the roller increases wear and tear on the die and roller, increasing the load and, in severe cases, damaging both. The roller-die gap can be adjusted during downtime using the eccentric mechanism on the press roller. Based on production experience, the optimum gap for processing general raw materials is 0.1-0.3mm, with some materials requiring 0.3-0.5mm. In actual production, because this gap is difficult to measure, the "intermittent contact method" can be used for adjustment. This involves adjusting the press roller without raw material on the inner surface of the pellet mill's ring die, so that it appears to be rotating but not rotating.
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