Vibrating screen has been widely used in Construction Waste Crusher mining, metallurgy, coal, water conservancy and electric power, transportation department and chemical department and other industrial departments so far. This machine is used for fulfill the screening, grading, washing, dehydration of the materials in all kinds of different technological process. Ore beneficiation is a middle link in the mining and metallurgy process, and the dressing efficiency not only directly influences the ore beneficiation production efficiency, but has a profound effect on the reasonable utilization of national resources. In recent years, the vibratory screening machine has been developing unprecedentedly, the theory frame of the vibrating screen has been stable and even mature, and all types of vibrating screens are researched, developed and launched, but the vibrating screen with high screening efficiency and high output has always the new direction of the research and development for vibrating screen.

The coal or rocks that are mined in the quarry or the materials that are crushed, before they are further processed or used, the workers need to separate them into several levels according their granularity, or to dehydrate, medium draining and deslime, and sometimes all these processes are needed. In the separating process, there are always some grading problems, and the grading process during which the materials go through the screening face and screening hole is called screening. Through the research to the screening process of the materials, we find that the screening is made up of two stages:

1. The particle that is smaller than the size of screen hole will reach the screening face through the material layers composed by the rough particles. 2. Fine particles will go through the screen by way of the screening hole in the screening face.