RESEARCH OF PARAMETERS AND MODES OF THE VIBRATION CRUSHER

Abstract

One of the main directions of research on machines for the production of building ma-terials is the reduction of energy consumption. Solving the problem related to the determination of energy consumption is a rather difficult task, since energy consumption depends on a number of factors that change during the operation of the machine and are difficult to accurately describe. One of the areas of development of machines for the production of construction materials is the creation of resonant vibration machines. Based on the analysis of the latest researches, the prospects of vibrating jaw crushers have been established. The correct selection of parameters that will ensure the operation of the crusher in a stable resonance mode will make it possible to reduce energy costs for crushing. For this purpose, the study of the dynamic parameters of the vibrating jaw crusher is presented in the paper. The efficiency of the double-acting vibratory crusher under study is ensured in the resonance mode with the synchronous adjustment of the movement of the first and third masses and the counterphase movement of the second mass. For this, the stiffness of the elastic connections c1 and c2 is calculated from the condition of resonance of the reduced masses m23 and m12, respectively, and the stiffness of the support springs from the condition of vibration isolation. The physical model of the crusher is presented and the equations of motion of oscillating masses with and without material in the crushing chamber are given. Graphs of the effect on the amplitude of the stiffness adjustment coeffi-cient by frequency were obtained. Based on the equations of motion, the amplitude-frequency characteristics for the corresponding natural angular frequencies (resonance frequencies) are constructed. The mass of the oscillating parts of the crusher has a great influence on the amplitude of oscillations. Rationally selected ratios of oscillating masses provide the required operating mode (in-phase, anti-phase) and provide the re-quired amplitudes of oscillations of these masses. For the given input conditions, the rational limits of the ratios of the oscillating masses are determined to ensure the corresponding frequency regimes. Based on the analysis of the amplitude-frequency characteristics, graphs of the amplitudes of the movement of the oscillating masses of the crusher were constructed. Recommendations for choosing effective frequency modes are given.