Main Factors Affecting the Process of Vibrating and Screening Machinery

 Keywords: Screening, Materials, Vibrating Screen

        The technical index of screen procedure is screening efficiency and manufacturing efficiency. The former refers to the quality index and the latter refers to the quantity index. There are some relations between them, besides it also relates to some other factors, they decide the result of the screen. Factors affecting the screen procedure can be divided into the following three classes:

The physical characteristics of screen materials

        Physical characteristics of the materials include particle size, moisture content, silt content and particle shape etc.

When the fine content is larger the screen efficiency is also higher. Generally speaking, if the material moisture content is larger screen efficiency will reduced. However, the lager opening size the smaller moisture affects. In order to improve the screen procedure, we usually increase the mesh size or use wet sieving when we screen the high moisture content wet materials. High silt content (silt content more than 8%) should use wet sieving or pre-washing ore.

        The structure and characteristics of the screening surface

  

         Vibrating screen has the advantage of high screening efficiency and large production capacity because the particles and screen surface of Vibrating screen movement vertically. While the relative motion of particles and screen surface is mostly about the parallel movement of bar screen, gyratory screen, and trammel screen etc, which is lower in screen efficiency and production capacity.

        For some materials, the mesh size decided the manufacturing efficiency of sieve and the screen efficiency. Vibrating screen productivity depends on the width of the screen, the wider of the screen the higher productivity. Screening efficiency depends on the screening surface length, the longer screen surface the higher screening efficiency. Usually the screening surface length is two times of its width. The larger effective screen surfaces the higher effective sieving area and productivity per unit.

     The larger opening sizes the higher productivity and the higher screening efficiency.

Production condition

      If the loads outweigh the sieve support the screening efficiency can be inefficiency. The sieve peace rate largely rely on the mesh size and the general screening efficiency; the larger mesh size and lower screening efficiency the higher productivity.

       During the screening procedure we should feed the material equably, it’s very important.

      Generally, we will by means of the testing to determine the inclination angle of the appropriate sieve. And then there are the amplitude and vibration min, which related to the structure of the sieve, to a certain extent, increasing vibration can improve the screening indicator.

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