company news about What causes excessive noise in extruded feed pellet mills?

Many farmers have noticed that after six months to a year of use, the noise from their pellet mills suddenly increases—the previously steady "humming" sound turns into a "creaking" or "clunking" noise, affecting not only the working environment but also causing constant worry that the machine might suddenly break down. This is most likely due to worn-out parts. Today, we'll discuss which worn parts cause noise and how to repair them.

Three reasons

1. Wear of the pressure roller and ring die (the core cause)

Cause: The pressure roller and ring die are the components that directly extrude the raw material. The pattern on the surface of the pressure roller will be worn smooth by the raw material, and the die hole of the ring die will be enlarged by impurities. When the two are in contact, they cannot fit tightly, resulting in a "clunking" impact sound during operation. If the wear is severe, the pressure roller will also rotate eccentrically, and the noise will be even more intense.

Solution: Inspect every 500 hours of operation – if the pattern on the pressure roller is worn smooth, replace the pressure roller skin directly (no need to replace the entire pressure roller, saving money); if the die hole of the ring die is worn and the pellet output is uneven, replace it with a brand new ring die. Before feeding, use a sieve to remove stones and metal shavings from the raw material to reduce wear.

2. Bearing Wear (Most Easily Overlooked)

Cause: The screw and pressure roller shaft of the pellet mill are supported by bearings. The balls inside the bearings rotate at high speed for a long time, which can cause scratches or deformation. Increased clearance will produce a "rustling" noise. If there is insufficient lubrication, wear will be accelerated, and the machine may even seize up, causing the noise to suddenly become sharper.

Solution: Before each startup, touch the bearing housing – if it is hot or makes a "rustling" sound, stop the machine immediately. Open the bearing cover; if the balls are scratched, replace the bearing with the same model (remember to buy original parts for a better fit). Regularly add lubricating oil every 200 hours; do not wait until the oil dries up.

3. Gear Wear (Transmission System Problem)

Cause: Pelletizers rely on gears to transmit power. Over time, the gear teeth wear down, becoming uneven and even losing teeth. During operation, loose gear meshing produces a clicking or clanging sound, and in severe cases, can cause fluctuating rotation speed.

Solution: Open the gearbox and inspect the gear teeth. If there are obvious signs of wear, replace the entire gear set (don't just replace one; the fit between the old and new gears will be worse). Change the lubricating oil in the gearbox every 3 months; dirty oil will accelerate gear wear.

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