Теоретичне дослідження параметрів вертикальної роторної дробарки

. Stone is one of the most widespread and important natural resources, which are actively used in various fields of activity. Energy costs for the working processes of machines for the production of building materials can be significant. In addition, constant costs for maintenance, spare parts and power also impose an additional financial burden on companies producing building materials. Considering these factors, the issue of optimizing and improving such machines is extremely important. Increasing their efficiency and reducing energy costs will significantly reduce the cost of manufacturing building materials, as well as reduce the environmental burden. A vertical shaft rotary crusher belongs to the class of centrifugal impact machines and works on the principle of material destruction by free impact in the field of action of centrifugal forces. In such crushers, several destruction mechanisms are implemented simultaneously. The interaction of these mechanisms ensures a very high crushing rate and obtaining a high-quality product. An important advantage of such crushers is that they work effectively at high rotor rotation speeds. The increase in the linear speed of the rotor flow enhances the impact effect, which makes it possible to destroy even very strong materials with relatively low energy consumption. At the same time, work on the principle of free impact ensures a uniform effect on each particle, which avoids excessive grinding and reduces the amount of dust fraction. The paper considers the critical velocity of a material particle when it leaves the rotor. The equation of particle motion is analyzed. The influence of the physical and mechanical properties of the material on the critical velocity of particle exit is studied. Dependencies for determining the productivity and power of a rotary crusher are considered.