Abstract
The roller vibratory classifier is equipped with an impact device for implementing vibro-shock mode, which improves the classification efficiency, especially of viscous and wet materials. The new device is a disk nozzle with blades, which are made like petals of wearresistant polymer. The immersion of a petal at a given depth in a crushed rock mass is investigated experimentally. Theoretical studies includes pair correlation and regression analysis methods. It is obtained that an increase in humidity promotes penetration and leads to a decrease in the energy necessary for impact, whereas an increase in particle size and layer thickness leads to its increase. Analysis of regression equations makes it possible to establish the percentage ratio of influencing factors. The article presents mathematical models of impact energy from variable factors for the initial moisture content of the material, including separately for small classes (-2.5 + 1) mm and further, with variation of all three parameters in the range: layer thickness – 20-40 mm, particle size 1-10 mm, humidity – up to 9 %. The obtained correlation dependencies and regression models are necessary for improving the existing and designing new blade-type roller vibratory classifiers.
Highlights
The improvement of roller vibratory classifier is promising using additional shock loads, which makes it possible to implement vibration-shock mode and active mixing of the material
At the initial humidity content of crushed granite, it is established that the impact energy required for the penetration of the blade into the rock mass layer is influenced by the size of the raw material slightly higher than the influence of the layer thickness, their percentage is d: h = 57: 43
It was found that an increase in humidity leads to a decrease in impact energy, which is a consequence of a decrease in the influence of external friction forces, while an increase in particle size and layer thickness requires an increase in energy
Summary
The improvement of roller vibratory classifier is promising using additional shock loads, which makes it possible to implement vibration-shock mode and active mixing of the material. The adhesion forces between the particles are violated, which leads to an increase in the classification efficiency, especially of viscous and wet materials [1]. It is proposed to made blade-type roller vibratory classifiers. It is proposed to place a rim (disk) on the cylindrical rolls of the classifier with the blades, which are made like petals. The blades fixed on it in the form of teeth. Discs with blades (Figure 1) are made of hydrophobic polymers, for example, wear-resistant (tread) rubbers [1, 2]
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