Gyratory screen & sifter is also called as reciprocating screener, from the perspective of the motion trajectory of the screen body. The vibration force generated by the drive device is a force that changes in a certain direction around a fixed axis. Its essence is the reciprocating inertial force formed by the rotation of the eccentric wheel around the fixed axis. From the structure and working principle of the gyratory sifter, it can be seen that the eccentric wheel pitch of the transmission mechanism of the material movement trajectory and the residence time of the material on the screen mesh have a vital influence, that is, the processing capacity and the sieving efficiency has the opposite effect. In view of this, we can choose between production capacity and sieving efficiency according to specific conditions and needs in the actual operation. The screen surface is generally horizontal or slightly inclined (the inclination angle is 0°~5°) according to the structural characteristics and working principle of the gyratory screener.