There are two main factors that affect the gradation of machine-made sand in the production process of the sand production line. One is the crushing method of machine-made sand, and the other is the screening link of machine-made sand. The crushing method of machine-made sand (the choice of crusher) is an internal factor that affects the gradation of machine-made sand, and the screening link is an especially important external factor that determines the particle gradation. Therefore, to control the gradation of machine-made sand mainly from these two aspects.
At present, two crushing methods with a wide range of applications are impact crushing and impact crushing. Among them, the machine-made sand produced by impact crushing has more angularity, poorer grain size but better sand gradation; impact crushing The produced machine-made sand particles are round-shaped particles, with good particle size, but the gradation has the characteristics of "more at both ends and less in the middle". Combining the characteristics of the two types of crushing methods, a combination of impact crushing and impact crushing is adopted to obtain machine-made sand with better grain size and gradation.
Another important factor that controls the gradation of manufactured sand products is the screening process. The shape, size and inclination of the screen surface of the vibrating screen are key parameters that affect the quality of manufactured sand; there is a large content in the manufacturing process of manufactured sand. Stone powder particles, and have higher requirements for gradation, generally square square-hole sieves are used instead of rectangular and round sieves. In order to achieve a good screening effect and processing capacity of the material, according to the experience of the vibrating screen manufacturer, the inclination angle of the screen surface is generally controlled at 20. Left and right are appropriate.
The sieve size of the vibrating screen directly affects the fineness modulus, gradation and stone powder content of machine-made sand. The larger the mesh size, the greater the fineness modulus of the machine-made sand, and the content of particles above 2.36 in the gradation also increases. According to the experimental results, the actual size of the mesh is controlled within 3.5 to 4.5. In between, the particle gradation, stone powder content and fineness modulus of machine-made sand can meet the production requirements. In the actual production process of Xinfu high-speed machine-made sand, the mesh size of the vibrating screen is 3.8rnm. After sieving, the resulting machine-made sand gradation has a content of more than 2.36 between 13.6% and 14.8%. At the same time, the particle gradation of machine-made sand is reasonable to meet the needs of actual engineering.
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