The main reasons for the need for regular replacement of biomass pellet machine ring die include wear and fatigue damage ‌. The mould of biomass pellet machine is an important part and wearing part of biomass pellet machine. Its working principle is to extrude the material through the ring die hole. With the increase of use time, the inner wall of the ring die hole of the die will gradually wear, resulting in the increase of the aperture and the particle diameter exceeding the specified value‌.

In addition, the inner wall wear of the biomass pellet machine is uneven, and the surface is uneven, which will prevent the material flow, reduce the output, and finally stop the use ‌. The wear of the inner wall of the ring die will also lead to the increase of the inner diameter, the thinning of the wall thickness, the decrease of the structural strength, the possible crack and expansion, and ultimately the failure of the biomass pellet machine ring die‌.
The replacement cycle and service life ‌ of the biomass pellet machine ring die‌ also affect the necessity of regular replacement. The general alloy steel ring die can work for about 1000 hours, and a set of press rollers can work for about 500 hours. Since the loss ratio of the biomass pellet press roll and the die is about 1:2, replacing the biomass pellet machine press roll twice requires replacing the secondary material biomass pellet machine ring die.