In biomass pellet making industry, the ring die is the most important wear parts of biomass pellet machine, no matter vertical ring die pellet machine or horizontal ring die pellet machine. The ring die matters the whole pellet production efficiency and biomass pellets quality. But the pellet machine ring die cracking problem always happen, this will not lead the pellet machine shut down, and increase the whole pellet making cost. Today we will give you some reasons about the pellet machine ring die cracking and some measures to avoid this problem.

Mechanical wear
Roller and ring die wear
With the time running, the surfaces of the press roller and the ring die will gradually wear, leading to uneven pressure on the ring die.

Transmission key wear
The transmission key gradually wears down due to friction and pressure over prolonged use.

Shaft jumping and bearing damage
The Slight runout of the main shaft and bearing damages will cause stress concentration on the ring die, increasing the risk of cracking.

Improper Installation and Operation
Incorrect Roller Installation:
If the rollers are not installed correctly, they can cause uneven pressure and stress on the ring die.

Inadequate Roller-Ring Die Gap Adjustment:
The ring die and roller should keep at suitable distance, the gap should not be too small ,or too big. The perfect situation is that the roller shell just touch the ring die surface , and the roller can rotate freely. Too stress will make the roller shell and ring die break easily, if the gap is too big, it can not good quality pellets.

Forget to Clean Die Holes During Shutdown:
ring die holes block

Every biomass pellet line shut down, the correct practice is to clean the ring die holes with oil raw material, this can make sure the ring die can make good quality pellets when next operation. If you forget to clean the ring die holes, the dry raw materials will stuck inside the ring die holes, which will bring damage to the ring die, and when you start the pellet machine next time, you need to spend quite long time to make pellets smoothly.

Using Hard Steel Tools to Replace the Ring Die:
This always happen when you replace the ring die, the workers will use hammers to replace the ring die, this will bring quite big damage to the ring die also.