The process of vibrating sieve price crushed and bulk materials with different particle sizes through a single-layer or multi-layer screen surface with uniform holes for many times and dividing them into several different levels is called screening. The particles larger than the sieve hole remain on the sieve surface, which is called the oversize of the sieve surface, and the particles smaller than the sieve hole pass through the sieve hole, which is called the undersize of the sieve surface. The actual screening process is: after a large number of broken materials with different particle sizes and mixed thicknesses enter the screen surface, only a part of the particles are in contact with the screen surface. Due to the vibration of the screen box, the material layer on the screen is loosened, so that large particles originally exist. The gap is further expanded, and the small particles take the opportunity to pass through the gap and transfer to the lower layer or the conveyor.