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Although the vibration probability sieve has the above three types, it is screened by the principle of large sieve hole, multi-layer sieve surface and large inclination angle. The general working principle and structure are shown in the following figure. The screen box is usually hoisted on the factory floor or steel frame by spring. The screen box can be installed with 2~6 layers of screen surface. The size of the screen hole is reduced from the upper layer to the lower layer, and the screen inclination angle is increased. The linear vibrating probability screen adopts a two-axis vibrator, and the inertial resonance probabilistic screen adopts a single-axis vibrator, and the vibrator is generally installed on the upper part of the screen box. The feedstock is fed from the upper left of the screen box, and the screened product is discharged from below. The screened products of each screen surface can be discharged together or discharged separately according to the needs. Since the inclined angle of the screen surface is large, the effective mesh size is smaller than the actual mesh size, and the probability that the coarse particles hit the mesh is more than that of the fine particles, so that the probability of discharging through the mesh is less, and no layer is formed on the sieve surface. This impact of the particles makes it more difficult for the coarser particles to pass through the mesh. As a result, only fine particles having a particle size much smaller than the actual mesh size can pass through the mesh. Since the inclination angle of the screen surface is increased from the upper layer to the lower layer, the corresponding effective mesh size is smaller and smaller, so that the ratio of the mesh size to the actual sieve particle size is increased (about 2 to 4), which also makes the lower sieve The hierarchical granularity of the network is finer. Since the size of the mesh is relatively large compared to the size of the fine particles of the sieve, the fine particles can be quickly passed through the mesh, so that no "layer" is formed on the sieve surface, and the absence of the layer further accelerates the screening process, and the sieve The hole is not easy to block, the friction of the screen surface is reduced, and it is more suitable for processing wet and sticky materials. At the same time, the screening ability and efficiency are also improved, and the processing amount per unit area is about 5 to 10 times that of the ordinary vibrating screen. The disadvantage of the probability sieve is that the undersize product often contains a certain amount of coarser particles, so it is only suitable for approximate screening.
In addition, the linear vibrating equal-thickness probability sieve not only has the characteristics of probability screening, but also has the characteristics of equal-thickness screening method. The screen surface is a fold line shape, the first section works according to the principle of probability screening; the second section works according to the principle of equal thickness screening, and the number of sieve layers is generally small, 1~2 layers, and the inclination angle of the sieve surface is also small, The movement speed of the material on the sieve surface is slowed down, the thickness of the material layer is thickened, and an equal-thickness screening process is generated, which promotes the small particles to contact with the screen surface and fully sifts through the sieve (Fig.), thereby increasing the throughput and Increased screening efficiency.