RESEARCH OF A NONLINEAR MODEL OF AN ELECTRIC FURNACE MOBILE BASE PLATE FOR FIRING BULK MINERALS

Relevance. Electric furnaces with a mobile base plate have drawbacks in the design of vibrotransport system. It is the platform located at an angle to the horizontal plane. It is relevant to use a horizontal base plate, which excludes spontaneous rolling of material rounded particles and eliminates the possibility of temperature traction occurrence inside the firing space, resulting in cooling furnace heating system as well as fired bulk material. The aim of the research is to study the dynamics of a mobile platform with a base plate and a one-sided elastic element, which provides a strongly presented nonlinear elastic characteristic, and bulk material vibrotransportation over the surface of a horizontal base plate. The object of the research is a mobile base plate of an electric furnace for bulk minerals firing. The methods are based on the development of the design and model of a mobile base plate of an electric furnace for firing bulk minerals. The results of researching the properties of a special elastic element in the furnace mobile base plate allowed obtaining a nonlinear analytical model of its motion, which is characterized by an inclined «skeletal» curve of its amplitude-frequency characteristic. The research of the dynamics of an oscillatory system with a one-sided elastic element, providing strong non-linearity, confirmed that the system performs non-symmetrical vibrations with peak vibration acceleration values of 8,32 and 4,79 m/s2 corresponding to the extreme positions of the base plate and differing in 1,74 times. It is shown that when the furnace is installed horizontally, the system sensitivity to fluctuations of excitation frequency, spring stiffness, friction forces and other factors, which change due to the influence of high temperature and external factors, is almost three times reduced. The effect of stable vibrotransportation of bulk material on the horizontal surface of the base plate in the thermal field of the furnace is confirmed.