The paper investigates the physical and chemical properties of the carbon-containing material of the secondary raw material for the production of acetylene and its effect on the radiation resistance of rubber products and cable rubbers. It was found that the carbon-containing material is modified carbon, the surface of which is microencapsulated with oligomeric oxygen-containing compounds, its thickness, calculated from the value of the specific geometric surface, amounted to 50-60Å. The effect of carbon-containing material on the relaxation coefficient and compressive stress is shown, and radiation resistance by the relative elongation of rubbers in an ionizing radiation environment 60Co. At the same time, it was found that, due to the finished oligomer on the surface of particles of carbon-containing material, threshold dose of radiation of rubbers based on styrene butadiene rubber according to the relaxation index, compressive stress and the coefficient of radiation resistance in terms of relative elongation increases three times compared to carbon blacks P803. Similarly, dependencies were obtained in rubbers based on other types of rubbers, including nitrile butadiene rubbers, possessing low radiation resistance due to the increased tendency to structuring. The findings indicate that the carbon-containing material is an effective filler for increasing the radiation resistance of industrial rubber goods and cables, operated in the environment of ionizing radiation.
In the paper, the influence of modified Angren kaolin on the properties of composite elastomeric materials based on butadiene-styrene rubber has been established that the addition of modified Angren kaolin into rubber mixtures instead of gas pedals, activators and mineral fillers causes intensive connection of sulfur with macromolecules. Adsorbed sulfur on the surface of particles of modified Angren kaolin and its uniform distribution in the composition and formation of the structure with equal force were determined. This effect shows that the modified Angren kaolin in the curing processes accelerates and activates and affects the formation of the curing grid with equal strength and helps distribution throughout the composite. It has been established that introduction of MAK into the composition of elastomers more than 50 wt. % per 100 wt. % of rubber changes technological and technical properties of composite elastomeric materials. The application of modified Angren kaolin instead of the gas pedal, activator of vulcanization and mineral filler in composite elastomeric materials allows making rubber goods of various purposes.
The subject of the research is the optimization of the mechanism of the cross planer. In the article, on the basis of the condition of closed contours, the equations of the projection of the links on the corresponding coordinate axes are compiled. A functional relationship has been established between the kinematic parameters characterizing the movement of the input and output links of the mechanism. The obtained numerical calculations are presented in the form of graphic dependences. The aim of the work is the optimal metric synthesis of the mechanism of a cross-planer, with parametric restrictions. The conclusions obtained in the article can be used to improve and design modern technological equipment with mechanisms similar to the mechanism of a cross-cutting machine.
The article considers methods for studying torsional vibrations of the wheel-motor block of a diesel locomotive UZTE16M. The diesel locomotives in question were modernized at the structural enterprise “O’ztemiryo’lmashta’mir” (Machine building and repair in Uzbekistan Railways company) under the joint-stock company “O’zbekiston temir yo’llari” (Uzbekistan railways). The authors of the article developed a dynamic model for the analysis of torsional vibrational movements that occur in the traction transmissions of the UZTE16M diesel locomotive, taking into account the geometric dimensions of the electric traction motors of the main locomotives and the degree of their wear. Based on the model of the wheel-motor block of mainline locomotives, differential equations of the torsional-vibrational motion of traction gears are obtained in the form of Lagrange equations of the 2nd kind. The results of numerical studies of the amplitudes of torsional vibrations of the wheel-motor block of the UzTE16M locomotive at different frequencies are presented. All calculations were performed in the MATHCAD 15 environment.
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