The vibration screen operates by utilizing reciprocating rotary vibrations generated by the exciter. The upper rotating heavy hammer causes the screen surface to produce a planar circular vibration, while the lower rotating heavy hammer creates a conical surface rotation vibration. The combined effect results in a complex spiral vibration on the screen surface. Its vibration path is a complex spatial curve, which projects as a circle on the horizontal plane and an ellipse on the vertical plane. Adjusting the excitation force of the upper and lower rotating heavy hammers can change the amplitude. Additionally, adjusting the spatial phase angle of the upper and lower heavy hammers can alter the shape of the screen surface's motion trajectory curve and the trajectory of the material on the screen surface.