Research On Dynamic Response Of Mine Hoist

Mine Hoist is the throat of mine production equipment, whose performance has a direct impact on the safety of persons underground and mine. With the continuous development of mining machinery and advances in technology and the growing demand for resources, mine hoist is moving in a direction of large-scale, high-speed and heavy- load. Higher and higher demand on performance of mine hoist is put forward. For a long time, mine hoist has achieved substantial growth, but at the design stage, because currently there is not yet appropriate formulas and material to be used to calculate the dynamic load coefficient, designers are still using the traditional static design methods. In order to consider the dynamic load, designers usually give a dynamic coefficient according to their own experience, which is leading to the strength of structure over-safety or not enough. The research on dynamic response to mine hoist is been carried out, which provides a theoretical basis for the calculation of the dynamic load factor, simultaneously the though of dynamic design is introduced to the design of mine hoist.On the basis of the research both on structure and working principle of mine hoist, using the single rope winding mine hoist for the model, establishes the dynamic model and differential equations of motion of mine hoist system. Aiming at the mine hoist's work nature of frequently starting and braking, analyzes each typical working condition of mine hoist. Under different working condition, because of differential equations and its parameters, the obtained dynamic load response to system is very different.To search for analytic solution of dynamic load factor, the paper conductes reasonable simplification and assumptions, and establishes the semi-definite kinetic model which has three quality and two degrees of freedom. Considering the coupling relationship among vibration forms, theoretical calculation method of modal analysis is adopted, and the system's dynamic load response characteristics and dynamic load time history in the transition process is received. Integrating the typical working condition of mine hoist, we discuss changes of dynamic response and dynamic load coefficient under different working conditions.The kinetic model of four mass mechanical and three degrees of freedom is also established. The dynamic load characteristics of mine hoist is simulated by the use of Matlab/Simulink software under different working conditions. The theoretical calculation is compared with the simulation, and the results are closer to each other. Therefore, the established dynamic model of three quality and two degrees of freedom can meet the engineering application requirement. Theoretical calculation result can provide a theoretical foundation for dynamic load coefficient according to static strength. Meanwhile, it also can supply theoretical guidance for dynamic design and research of other hoisting machinery and elevating mechanism. It proves that the theory result is valuable for engineering application.