Rotary screen is suitable for the production mechanism of dry sand and the screening of granular materials. It is generally easy to install, stable and of low noise. The easy airtight screening is used to collect dust. The rotary sieve is composed by the motor and discharging end etc. The roller apparatus may be tilted and rotated, the material within the drum flip card in the mesh so that material can be ejected to prevent the sieve clogging. Materials on the screen surface will flip and scroll so the qualified materials will be discharged through the sieve by the sieve roller discharge end. Rotary screen or rotary sieve has principle similarities with the high-frequency ore screen. Specially processed cartridge structure rotary sieve has large processing capacity and is less prone to clogging phenomenon, because the material in the drum flip card in the sieve will be ejected.