Swing screen for high screening accuracy (> 99%), screening levels (up to 5 layers), production process requirements, divided into common type and explosion-proof types. Device Model: YBS (swing sieve) - (Unit) M-(level) - (Material P: Material Standard A3 F: Stainless steel SS304) structural principle according to the principle of the modular structure design, development, a crank shaft driven by a rigid, and the homeostasis. Adjustable angle drive of the rigidity of the crank shaft, circular sieve to achieve three-dimensional movement of the body, i.e., a vertical movement is superimposed in the horizontal direction perpendicular to the circular motion. Vibration parameters with the rotation speed of the crank eccentricity, radial and tangential inclination angle of the size variations. This design is configured such that a combination of operating parameters can be infinitely more, so that the material may be sieved to the desired speed of movement of the mesh layer or in the desired residence time in the mesh layers. The amplitude of the acceleration and the screening machine with the material and the size of the eccentricity of the crank changes in the cutting angle of the crank shaft determines the size of the sieve material in a circular motion speed; radial direction determines the angle of the crank shaft from the screen center to the material Speed ??Edge movement; and interactions tangential radial inclination lead to screening of the material in the sieve as a spiral involute campaign material in the sieve stay, and measure the accuracy of screening that is cut and combination ratio of the size of the radial inclination determined. Structural features A, the pyramid-shaped base and chassis is a fundamental part of the screening machine, the middle layer of the screen, can be increased or decreased as required. B, main shaft through the bearing fixed base of the pyramid, the main shaft balanced blocks down, so the screening machine to maintain a balance in motion. Screen Machine by V-belt driven by a common motor. C, the base body screening machine that is around for a screening machine spindle system revolves around another planet to the spindle from the autobiography of rotation. Advantages A, the material can enter from a central machine, turn each material were sieved from the center to the next level. Therefore, the distance of each part of the material is substantially similar to the sieve movement. This can guarantee accurate screening. B, can a reasonable adjustment screen machine, larger particle size material in layers near the edge of the screen, the vertical acceleration increases, screening efficiency can be further improved.