Vibrating Screen is a mining machinery device with a double-degree-freedom directional powered vibration characteristic that is broadly used in the industry of cement. It has many advantages, like simple stable work, structure, low consumption but with a high efficiency. Although in this useful application, the occurrence of no reasonable maintenance and unsteady work is common. And following a phase of using, the transmission capability for the material reduces evidently. At this condition, if maintenance is not reasonable, usual procedure of the device will be affected quite seriously. ■