What Are the Common Problems of a vertical ring die pellet mill?

 

 

Common faults in vertical ring die pellet machines are concentrated in core systems such as forming, feeding, transmission, and electrical systems. Mastering basic troubleshooting logic can significantly reduce downtime losses. The first type: Poor pellet forming (loose, cracked, not forming), this is the most frequent fault. Symptoms include easily scattered finished pellets, insufficient calorific value, and in severe cases, inability to form pellets. Core causes: Inappropriate raw material moisture content (below 12% or above 15%), excessive gap between the pressure roller and the die (more than 0.3mm), die hole blockage or wear, and raw material particle size exceeding the standard (greater than 5mm). Solutions: First, check the raw material moisture content and adjust it to 12%-15% through drying or water spraying; check the gap between the pressure roller and the die with a feeler gauge and adjust the bolts to 0.1-0.3mm; disassemble the die, clear the die holes with a thin steel rod, and replace the die if severely worn; screen the raw material to ensure the particle size meets equipment requirements (2-5mm for flat die machines, 2-3mm for ring die machines).

 

The second type: Poor feeding or blockage in the ring die wood pellet making machine. The symptoms include raw material accumulation at the feed inlet, interruption of equipment feeding, and large fluctuations in motor current. Causes: Raw material caking and incomplete crushing, excessively fast feeding speed, foreign object blockage at the feed inlet, and excessively high moisture content in the raw material causing adhesion. Solutions: Stop feeding and clean foreign objects and caking raw material from the feed inlet; reduce the feeding speed and adjust it to a feed rate suitable for the production capacity using the frequency converter system; re-crush the caking raw material to ensure it is loose; if the raw material is too wet, dry it before feeding.

The third type: Small wood fuel pellet making machine exhibits severe vibration and abnormal noise. Symptoms include significant equipment shaking during operation, accompanied by metallic impact sounds or harsh friction sounds. Causes: Uneven gap between the pressure roller and the die, loose equipment foundation bolts, worn or insufficient lubrication of bearings, and hard impurities (stones, metal) in the raw material. Solutions:

 

Category 4: Wood fuel pellet making machine motor overheating or tripping. Symptoms include the motor casing temperature exceeding 90℃, causing the thermal protection device to trip and preventing startup. Causes: Equipment overload (excessive feed), unstable motor voltage, clogged heat sink, or stuck bearings. Solutions: Reduce feed rate to ensure motor current remains stable at 80%-90% of rated value; check power supply voltage to ensure it meets equipment requirements (220V/380V); clean dust from motor heat sink to ensure proper heat dissipation; check motor bearings, remove any obstructions, or replace the bearings.

Category 5: Uneven cutting (uneven pellet length, stringy). Symptoms include significant differences in finished pellet length, rough cuts, and some pellets with stringy texture. Causes: Dull cutter, improper cutter/mold distance adjustment, or loose cutter. Solutions: Sharpen or replace the cutter to ensure a sharp blade; adjust the cutter/mold distance to control pellet length at 2-4 times the aperture diameter; tighten cutter fixing bolts to prevent loosening during operation.

Category 6: Sudden Drop in Output. Symptoms include a sudden drop in production capacity of over 20% and a decrease in the finished product qualification rate. Causes: Severe blockage of the die holes in the Flat Die Wood Pellet Making Machine, severe wear of the pressure rollers, insufficient raw material supply, and slippage in the transmission system. Solutions: Thoroughly clean the die hole blockages; disassemble and grind the die if necessary; inspect the surface texture of the pressure rollers; replace severely worn rollers; ensure smooth raw material delivery and replenish raw materials; inspect the belt drive system, tighten the belts, or replace worn belts.

Prevention Points: Regularly maintain vulnerable parts, standardize raw material pretreatment, strictly follow the operation manual for starting and stopping the equipment, and monitor motor current and particle status in real time.

 

 

 

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1.What is the price of equipment for the small flat die wood pellet making machine?

It costs approximately US$1,500.00 - 25,000.00

 

2. If equipments have some quality problem, how would you deal with?
We will responsible for all the quality problems. Change all the parts for free.

 

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