Le 6 novembre 2014, 04:40 dans Humeurs • 0
Stack is composed of up to five individual screen decks laying one above the other and operating in parallel, the stack sizer can be fitted with high capacity, long life and urethane screen surfaces. Never before has one screening machine had such a high ability in a smallest amount of occupying space. Stack sizer is equipment driven by uniform vibrating source with the multi-layer screen box vibrating together. There are many factors which influence the work efficiency of the stack sizer, these factors can be roughly divided into three kinds.
Firstly, the physical properties of the material can have an influence on the working efficiency of stack sizer. Physical properties of the material include the size composition of the material, humidity, silt content and particle shape etc. When the fine grain content is large, productivity of the sieve is large as well. If the material humidity is big, the screening efficiency will decrease in general. However, the bigger the mesh size, the smaller the moisture influence, so for the wet material with large moisture content, in order to improve the screening process, usually operator can use the way of increasing mesh size or adopts wet sieving. When the material has large silt content (silt content is more than 8%), wet sieving should be used or the screen should be washed in advance.
Secondly, the influence of screen surface properties and structure parameters. The movement of stack sizer is linear oscillation; it makes the particles and the screen surface do vertical movement. So the screening efficiency is high and the production capacity is large. For a certain material, productivity and screening efficiency depend on the of mesh size. Productivity depends on the screen surface width. The wider the screen surface, the higher the productivity. Screening efficiency depends on the length of screen surface. When Screen surface is longer, efficiency of screening is better. length-width ratio is normally 2. The bigger the opening rate, the higher the productivity in unit area and screening efficiency. And the larger the mesh size,the higher of the efficiency and productivity.
Thirdly, the working efficiency of the stack sizer is influenced by the production condition. The feeding load of stack sizer and the feeding uniformity mean a lot to screening process. The angle of the inclination for the stack sizer should be suitable. Usually, the angle is determined by taking a test. The amplitude and the shake frequency of the sizer are important. They are associated with the structure property of the sieve. In a certain range, increasing vibration can improve the screening index.
In practice, we can change the working efficiency according to the factors listed above. They are very good indicators for our work. On the other hand, using the stack sizer effectively can prolong the service life of machine as well as save time and money. Thousands of stack sizers are currently operating at oil processing plants worldwide and reaping significant rewards. Stack sizer is becoming more and more popular in the oil processing industry.