What Problems Often Occur in a wood fuel pellet making machine?

Jan 13, 2026

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Small flat die wood pellet making machine specific faults and solutions: Flat die machines have a simple structure, and faults are mostly concentrated in the feeding and pressing systems. First type: Raw material accumulation and uneven pressing on the flat die surface. Symptoms include localized raw material accumulation on the flat die, with some areas lacking pressing material, resulting in large differences in finished product density. Causes: Wear or improper angle of the feeding guide plate, preventing even distribution of raw material; flat die level deviation. Solutions: Replace or adjust the angle of the guide plate to ensure even material coverage of the flat die surface; calibrate the flat die level and tighten the flat die fixing bolts. Second type: Severe wear on one side of the pressure roller. Symptoms include significant differences in the wear degree of the pressure rollers on both sides, leading to uneven pressing force. Causes: Inconsistent gaps at both ends of the pressure roller shaft, resulting in uneven force; misalignment between the flat die and the pressure roller. Solutions: Adjust the gap of the pressure roller shaft to ensure uniformity on both sides; recalibrate the alignment of the flat die and the pressure roller to avoid unilateral force. Third type: Difficulty feeding manually. Symptoms include high resistance during manual feeding, making it difficult for raw material to enter the pressing area. Causes: The flat die rotation speed is too high, resulting in excessive centrifugal force on the raw material; the raw material particle size is too coarse, and the moisture content is too low. Solutions: Reduce the flat die rotation speed (adjust to 200-250 r/min); refine the raw material particle size and appropriately increase the moisture content to 13%-15%.

Ring die wood pellet making mill machine specific faults and solutions: Ring die machines have complex structures, and faults are mostly related to the conditioning system and transmission system. First type: Conditioner blockage or uneven mixing. Symptoms include uneven moisture content and temperature after conditioning, resulting in poor pellet formation; in severe cases, the conditioner may jam. Causes: The raw material contains large impurities, excessive steam addition causing material adhesion, and wear of the mixing paddle. Solutions: Clean the blockage in the conditioner, check the raw material impurity removal system; adjust the steam addition to ensure a moisture content of 14%-16% after conditioning; replace worn mixing paddles. Second type: Ring die eccentric vibration. Symptoms include severe vibration during equipment operation, accompanied by periodic noise. Causes: Ring die imbalance, loose ring die fixing bolts, and bent main shaft. Solutions: First, disassemble the ring die and check its balance. If unbalanced, perform a balance calibration. Tighten the ring die fixing bolts. Check the straightness of the main shaft; if bent, repair or replace it. Second, the finished product has excessively high powder content. Symptoms include a dust content exceeding 5% in the particles and a decrease in calorific value. Causes: Wear of the ring die hole, improper cutter position, and incomplete cooling and screening. Solutions: Replace the worn ring die; adjust the distance between the cutter and the ring die, optimizing the cutting angle; check the cooler and screening machine to ensure sufficient cooling and compliant screening.

Common Precautions: Both types of machines require regular maintenance of vulnerable parts and standardized raw material pretreatment. For ring die machines, extra attention should be paid to the steam pressure and temperature stability of the conditioning system; for flat die machines, attention should be paid to the uniformity of manual feeding.

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