Banana screen is mainly used in coal, mining, gold and other industries, bearing the important functions of cleaning, grading, dehydration, desliming and desliming. In recent years, in order to adapt to the construction and development of the large coal preparation plants and mining plants in our country which are highly efficient, energy saving and environmental protection, the market demand of the large banana screen which is used for the material grading is gradually developed to a large size, the market demand of the large banana screen of thousands tons per hour is getting larger. For large banana screen, the material on the screen plate of large banana screen on the market is difficult to quickly spread on the screen plate in time, and simply increasing the tilt angle of the screen plate will cause the material to slip out too fast through the discharge end and the screening effect will be reduced.