The rice grader is a post-harvest processing machine used to separate and classify milled rice grains according to size and quality. It is commonly composed of a feeding hopper, vibrating or rotating grading screens with different mesh sizes, a drive motor, and multiple discharge outlets for collecting different grades of rice. The machine is designed to improve uniformity, remove broken grains and impurities, and enhance the overall market quality of rice by ensuring consistent grading standards.

In operation, cleaned milled rice is fed into the hopper where it is evenly distributed onto the grading screens. The motor drives the vibrating or rotating mechanism, causing the rice to move across the screens while separation takes place based on grain size. Whole grains, broken grains, and fine particles are automatically sorted and discharged through different outlets for collection. Proper control of feed rate ensures efficient grading, while routine cleaning prevents clogging and maintains performance.