Paddy destoner machine, also known as a rice destoner machine is used to remove stones and other impurities from paddy grains (unhusked rice) before the milling process. The working principle of a paddy destoner machine is based on the difference in density between the paddy grains and the stones.

The machine consists of a hopper where the paddy is fed, a vibrating screen, an adjustable airflow system, and two separate chambers where the stones and paddy are collected.

First, the paddy is fed into the vibrating screen, where it is separated into two layers based on size and weight. The heavier and denser stones fall to the bottom of the screen, while the lighter paddy grains are carried to the top.

Next, the paddy grains are transported through an adjustable airflow system, which blows away any remaining lightweight impurities such as husk and dust.

Finally, the clean paddy grains are collected in one chamber, while the stones and other heavy impurities are collected in another chamber.

In summary, the paddy destoner machine works by separating paddy grains from stones and other impurities using a combination of a vibrating screen, an adjustable air flow system, and gravity separation.

The machine is commonly used in rice mills and processing plants to improve the quality of the rice and reduce the risk of damage to the milling equipment. It is also used by farmers and small-scale rice producers to improve the quality of their harvest and increase the value of their crops.