Dynamic features of vibrating jaw crusher of feed grain

Abstract

The vibration method of feed grain crusher can be realized in various designs of crushers, but preference should be given to dynamic machine schemes, as such systems contribute to energy saving and increase the reliability of the whole structure. The analysis of the totality of information on vibrating crushers developed in various branches of economy allowed formulating the main requirements to the dynamic systems of these machines. These include the following: providing vibration of points of the working bodies according to certain laws; implementation of self-synchronization of vibro-exciters (in the case of a pair of vibro-drive); ensuring the minimum amplitude of the load-bearing system of the crusher, on which the vibro-exciters are mounted; ensuring the maximum amplitude of the working body of the crusher; compactness of the vibro-drive; absence of parasitic vibrations. Due to these requirements, vibrating jaw crushers for feed grain deserve special attention. Crushers close in technical essence are successfully used in mining. In such crushers, various vibratory dynamic effects important for the technology are manifested. The purpose of this work is to increase the technical level of the vibrating crusher of feed grain on the basis of using the effects of self-synchronization of vibration exciters and intensification of discharging the crushed material. The mathematical model of dynamics of the vibrating jaw crusher of feed grain, taking into account its design features and interaction of working bodies with the technological medium, is obtained. It is found that of the two possible synchronization modes, the synchronous-synphase mode is stable. Analytical analysis has shown the technological operability of the dynamic scheme of the vibrating jaw crusher in this synchronization mode, while the dynamics of the crusher meets almost all other specified requirements.