Dynamics Analysis And Research For Roller Rocker System Of Large Scale Roller Mill

Roller mill is a highly efficient grinding equipment which is widely used in cement, chemical industry. It based on the principle of material bed to grinding materials. In recent years, as the increased demand for cement production, a growing number of large roller mills are used in cement production. With the large scale mills, some major components of roller mill's weight and size have reached unprecedented levels, such as roller, rocker, etc. Mill's vibration caused by the dynamic load is quite large, mill vibration will not only leading to mill shutdown, so that reduces the efficiency of mills operations, dust collector exhaust temperature changes, affecting the efficiency of dust collection and waste increase. At the same time, they will result in tensile fracture and gear lever, separator, fan and other auxiliary equipment damage.Column, rocker, roller, etc. are ones of the main components of roller mill, in the process of grinding materials,they are affected by dynamic loads and impact loads. Their structural dynamic characteristics have great effects on the machine performances of roller mill. Therefore, for the complex structures as body rocker arm system, carried out only in the design of their traditional static analysis does not accurately reflect the internal dynamic characteristics of the structure, their dynamic properties must also be considered.In this paper, take hydraulic pressure type of TRM, raw rocker roller mill body (Φ4000/1990 roller cone - flat disc, its average diameter is 1800mm.) as a study. The dynamic model and the differential equations of motion for the rocker arm system of TRM raw materials roller mill are established by analyzing its structure and vibration and of simplifying its arm system assumptions. Based on the dynamic model and the differential equations of motion as above, the modal analysis of the rocker arm system is done and the major components and its system's natural frequencies and vibration mode are obtained. Two methods'results were generally consistent with the principal. Then the dynamic performance and the harmony response analysis are completed by means of finite element analysis, the resonance frequency range of system and other dynamic features are found.In order to improve the dynamic performance and reliability, these dynamic parameters can be used as the fundamental basis of theoretical modified model and structural dynamic modifications. According to dynamic modification criteria, used the energy balance analysis, proposed three kinds of structural modifications to the program and the revised structure of the system are analyzed. Solved the shortage of traditional static design, all of these results are beneficial for optimized and re-design of the roller mill so that it has better dynamic performance.