Reference service life of the sand roller

The service life of a sand roller depends on a range of factors, including the condition of the rice mill, the characteristics of the sand roller itself, the type and variety of brown rice, its moisture content, the milling process, and the operator’s skill level. The reference service life of a sand roller is expressed in terms of the amount of rice milled, as follows (for single‑machine white‑rice production with standard processing accuracy): Milling tonnage = K × S × 1500 Notes: 1. The coefficient K is a reference value, typically ranging from 1 to 2. 2. S represents the effective grinding surface area of the sand roller, in square meters.

Replacement and Protection of Sand Rollers

After a period of use, both the rice‑milling output and precision of the sand rollers will decline—this is a normal occurrence. If output decreases, when conditions permit, you can remove the sand rollers and use a handheld grinding wheel to resurface the helical grooves; in most cases, production will then return to normal. For reduced precision, you can increase the pressure on the pressure bar or adjust the rice‑cutting blade to address the issue. Before replacing the sand rollers, carefully inspect other components in the whitening chamber—such as the helical conveyor and the rice‑diverting device—to ensure they are functioning properly; otherwise, even after replacing the rollers, the results may still be subpar. Sand rollers are fragile items; handle them with care during transport to avoid dropping, impact, or rolling. When storing, protect them from moisture, freezing, and excessive heat, and keep them away from acids, alkalis, or…