Analysis of roller crusher parameters for crushing process automation

Due to the significant energy costs in the process of manufacturing building materials, the need to reduce energy costs has become critical. One of the energy-consuming processes in crushing machines is the process of material destruction in the crushing chamber. Determining the energy costs that are incurred for material destruction, taking into account the physical properties of the material and creating conditions for the maximum rational application of loads in the crushing chamber is a pressing task. The study of the energy costs of a crushing machine is based on determining a number of processes and parameters that affect these processes. That is, the parameters of the mechanical mode of the crushing machine directly affect its energy efficiency. One of the types of crushing machines is roller crushers, the advantage of which is the simplicity and reliability of the design. Today, there is a tendency to replace medium and shallow cone crushers with HPGR roller crushers. The HPGR type crusher is used in the cement, iron ore and diamond industries. The main design parameters of roll crushers are: 1) angle of engagement; 2) frequency of rotation of the rolls; 3) productivity; 4) force between the rolls; 5) power The paper considers the crushing force of the roll crusher taking into account the physical properties of the material. The impact of the roll rotation speed on the friction coefficients that arise between the roll and the material, as well as between individual grains of the material, is assessed. The impact of the crusher roll rotation speed on the correction factor relative to the working environment is analyzed. The corresponding graphs are constructed, which reflect the limits of change of the corresponding coefficients at given roll rotation modes. Dependencies for determining productivity based on the efficiency factor and crushing force are considered. Dependencies for determining the angles of engagement for the fracture and compression zones are considered. To estimate the dimensions of the finished product, a dependence for determining the gap between the rolls is considered.