Screen is the main accessory to control the fineness of comminuted products, and it is also one of the main vulnerable parts of hammer crusher. Its kind, shape, density of pore, wrap angle and opening rate all have important influence on crushing and screening effect.
Generally, the area of the screen is large, and the crushed materials can be discharged out of the screen in time, so as to improve the grinding efficiency. The wrap angle of the screen plate determines the size of the screen plate area. Therefore, the larger the wrap angle, the higher the crushing efficiency. There are 180 °, 270 °, 300 °, 360 ° and so on. It is reported that the power output increases with the increase of the wrap angle, and the smaller the mesh diameter is, the greater the influence of the wrap angle of the sieve plate on the power output is. Therefore, when using a small sieve, the crusher should try to use a larger screen cover angle, so as to improve the power output and product particle size uniformity
