YKN series circular vibrating screen is Single-quality system of forced vibration screening equipment composed of the vibration parts with the screen box and exciter, etc. and the spring as elastic component. When working, the motor drives the exciter by the intermediate shaft and the flexible coupling to make the eccentric block of exciter rotating rapidly, and then generate the exciting force, which drives the screen box vibrating continuously. The material makes continuous projectile motion on tilted screen surface along with the screen box. When thrown up, the materials are layered, and in the process of fallen down to contact with the screen surface, the granules are falling through the sieve, the classification process of granule is completed again and again.