Although the classification process of high-frequency fine screen is similar to that of ordinary mechanical vibrating screening equipment, its classification principle is not exactly the same.
(1) The ordinary vibrating screen adopts a single-layer sieve plate or screen, and the grading size is basically equal to the size of the sieve hole, while the high-frequency fine screen adopts a laminated screen, and the screen size of the three-layer screen is larger than the separation size. The mesh size of the upper screen mesh is 0.6 times larger than the separation particle size. Therefore, the relationship between the size of the granular material through the sieve and the size of the sieve hole is different from that of the ordinary vibrating screen, and the ratio of the relative particle size is reduced.

(2) Since the high-frequency fine screen adopts high frequency, on the one hand, it destroys the surface tension of the pulp and the adhesion of the fine-grained materials to the coarse particles, and at the same time reduces the molecular attraction or electrostatic attraction between the granular materials. The adhesion between particles increases the speed of loose stratification and separation of particles. On the other hand, due to the high-speed oscillation of materials on the screen surface, the separation of large-density useful minerals is accelerated. The probability of contact between the sieve holes results in better separation conditions, so that the materials smaller than the separation particle size, especially the dense materials and the pulp, pass through the sieve holes together to become the under-sieve product.
(3) Since the high-frequency fine screen adopts the laminated screen mesh, although the three-layer screen mesh is stretched together, due to the error of the stretched mesh, the tension of each layer of the screen mesh is incomplete. In addition to the screen mesh moving with the screen frame, , There is relative movement between the screens, that is, due to the different tension of the screens, there is a very small up and down flapping movement and lateral movement between the screens. Due to this secondary movement, the stratification of materials according to particle size is accelerated, and the difficult-to-sieve particles can easily pass through the sieve holes and become under-sieved substances. Or it is squeezed out of the sieve hole to become the product on the sieve, so that the sieve hole is not easy to be blocked. Increases the area of ​​effective sieve holes in the sieving process.