The working principle of vibrating screen
Vibrating screens have been widely used in mining, metallurgy, coal, water conservancy, transportation, and chemical industries to complete various processes, such as screening, grading, washing, de-intermediation and dehydration of materials .
The coal or ore mined in the mining field, or the crushed material, needs to be divided into several grades of similar particle size before the material is used or further processed. And there are. When performing the above work, there is always the problem of grading materials through the holes of the screen surface, and the grading of materials through the holes of the screen surface is called sieving. Through the research on the screening process of materials, it is found that the screening of materials can be divided into two stages:
1. Fine-grained materials smaller than the mesh size reach the screen surface through the material layer composed of coarse-grained materials;
2. The fine particle material passes through the sieve holes on the sieve surface to complete the sieve.
In order to smoothly complete the screening process of the material, the condition of relative movement between the material and the screen surface must be satisfied. Therefore, the screen box of the vibrating screen should have suitable movement characteristics, on the one hand, it can make the material on the screen surface become loose; on the other hand, it can flash away the coarse material blocked on the screen hole and keep the fine material through the screen. The road is smooth. In the actual production process, 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 materials contact the screen surface.
In this part of the material contacting the screen surface, it is not entirely the fine particle material smaller than the mesh size, and most of the remaining fine particle material smaller than the mesh size is distributed throughout the entire material layer. Through the movement of the screen box, the material layer on the screen surface is loosened, so that the existing gap between the large particles is further expanded, and the small particles take the opportunity to pass through the gap and transfer to the lower layer; at the same time, due to the small particles between the materials. The gap is small, and large particles cannot pass through. Therefore, the position of large particles increases continuously during the movement.
As a result, the original messy material particle group separates, that is, it is layered according to the particle size, forming an arrangement rule with small particles on the bottom and coarse particles on the top. The fine particle material that reaches the screen surface, because its size is smaller than the sieve hole size, can smoothly penetrate the screen, and finally realize the separation of coarse and fine particle materials and complete the screening process.” However, sufficient separation is impossible. In time-sharing, a part of the fine-grained materials will generally remain in the coarse-grained materials on the sieve and cannot pass through the sieve. Studies have shown that although the size of fine-grained materials is smaller than the sieve opening, the difficulty of passing through the sieve is not the same. Compared with sieve holes, the smaller the particle size, the easier it is to penetrate the sieve, and vice versa, the more difficult it is.
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