筛分机械工作过程的基础是物料与筛面的相对运 动。筛分机按筛面的运动方式可以分为：（１）静止筛面 筛面静止不动，一般是倾斜安装，加固定格筛、弧形筛等； （２）往复直线运动筛面 筛面在垂直面内做直线往复运动，如直线振动筛、共振筛等； （３）垂直圆运动筛面 筛面在垂 Screening machinery work process is based on the relative movement of materials and screen surface. Screening machine according to the movement of the screen surface can be divided into: (1) stationary screen surface stationary, generally inclined installation, fixed grid sieve, curved screen, etc .; (2) reciprocating linear motion screen surface in the vertical Surface to do a linear reciprocating motion, such as linear vibrating screen, resonant screen, etc .; (3) Vertical circular motion screen surface in the vertical