Ball mills are widely used for dispersion of materials in various industries, as they are characterized by ease of maintenance, operation and sufficiently high performance. To improve the process of inner-chamber classification of coarse-ground material, a new construction of the classifying partition with blades having cylindrical screening surfaces is proposed. The aim of the research is to substantiate the effectiveness of the application of the developed construction of the classifying partition in an industrial ball mill. The tasks of the research are to study the effectiveness of the developed construction of the classifying partitions on industrial ball mill. The tasks are solved of constructing and analyzing a regression equation that adequately describes the efficiency of the process of classifying coarse material with a cylindrical sieving surface depending on variable factors, determining rational areas of their values; comparing the efficiency of using blades with cylindrical and flat screening surfaces for inner-chamber classification of coarse material; confirmation of the possibility of providing the developed classifying partition with the mass productivity necessary for the operation of the mill. In the course of the work, the methods of simulation and mathematical modeling were used. As a result of the study, the efficiency of using a classifying partition with blades with cylindrical screening surfaces of a ball mill D×L=2×10,5 is substantiated.
In the construction materials industry, twin-shaft paddle mixers are common in the preparation of both dry and plastic mixes. When the blade rotates in a mixed medium, a compacted zone of mixed components is formed immediately in front of its working surface. This compaction negatively affects the quality of the mixture preparation, characterized by the homogeneity of the resulting mixture. In order to influence the compacted area, to intensify the mixing process, cylindrical rods are installed in front of the working surface of the blade. A mathematical description of the process of dry mixing of two components in a horizontal paddle mixer is obtained. It allows, depending on the design and technological parameters that most affect this process, to calculate the concentration of the key com-ponent in a certain volume of the mixture, both when installing cylindrical rods in front of the working surface of the blade, and without rods. Studies of changes in the concentration of a key component for a mixer with rods have been carried out with varying values of its design and technological parame-ters. Regularities of the influence of design and technological parameters on the change in the con-centration of the key component in a certain volume of the mixture and their rational values have been determined for a mixer with rods. When comparing the values of the concentrations of the key compo-nent obtained using the mathematical description for mixtures prepared in mixers with and without rods, it was found that the mixer with rods allows you to obtain a mixture of higher quality with the concentration values of the key component closer to the ideal value.
The relevance of using volumetric vibroforming machines in the production of reinforced concrete products is considered. A step-by-step vibration effect created by the cylindrical surface of a punch fixed to the vibration form of a continuous formless forming machine is described. The expediency of achieving effective compaction by changing the vibration velocity is proved. The spread of vibration by a punch immersed in a viscous concrete medium is described. Analytical expressions describing changes in amplitude and phase variations of vibration propagation velocity in viscous concrete medium are obtained. Using the obtained analytical expressions, the corresponding graphical dependencies characterizing the impact on the concrete medium vibroform with punches, consisting of two parts that oscillate with different amplitude and frequency characteristics are constructed. The influence of the radial size r of cylindrical punch surface, frequency and amplitude of its oscillations on the change of amplitude and phase shift of vibration propagation velocity is established.
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