The surface friction force of the screening material of the stone removal machine has a significant impact on the stone removal effect, as follows:

1、 The situation with high friction force

Promote material stratification: The greater frictional force enhances the interaction between material particles and between the material and the sieve surface. Under the vibration of the stone removal machine, this strong frictional force helps the material to be layered according to density and particle size. Stones with higher density are more likely to move towards the lower layer of the screen surface, while lighter materials are distributed in the upper layer, creating favorable conditions for the subsequent separation of stones and materials.

Increasing the residence time of stones: The increased friction slows down the movement speed of stones on the screen surface, prolonging their residence time on the screen surface. In this way, the stones have more time to gradually move towards the lower end or side of the screen surface under the action of gravity, airflow, etc., and are eventually discharged, thereby improving the efficiency of stone removal.

Optimize the effect of airflow: The material moves slowly on the screen surface with high friction, and the action time of airflow on the material and stones is relatively prolonged. Airflow can more effectively blow up or move lighter material particles, while stones are less affected by airflow due to their weight, further promoting the separation of materials and stones.

2、 In the case of low friction force

Difficulty in separating materials and stones: The small frictional force causes both materials and stones to move at a fast speed on the screen surface, and their relative motion is not obvious, making it difficult to form a good layering effect. Stones are prone to quickly pass through the sieve surface along with the material, resulting in some stones being unable to be effectively separated and reducing the stone removal effect.

Affects the trajectory of stone movement: With low friction, the stone experiences less resistance on the screen surface, making its trajectory more susceptible to vibration and airflow, resulting in deviation. This may prevent the stones from moving towards specific positions on the sieve surface according to the expected path, thereby affecting the accuracy and efficiency of stone removal.

Reduce screening efficiency: Due to the rapid sliding of materials and stones on the screen surface, the contact time between the materials and the screen surface is short, which reduces the chance for small particles in the materials to pass through the screen holes and lowers the screening efficiency. At the same time, some stones that should have been intercepted by the sieve holes may also mix into the material through the sieve holes due to excessive movement speed, affecting product quality.