Study On Dynamic Behavior Of Multi-rope Friction Hoisting System

As one of the major fixed equipment in coal mine, mine hoisting system is a tie that connects underground and ground. So its dynamic performance and hoisting capacity is one of the important affecting factors of coal mine production. With the excessive exploitation of coal resource, the increasing depth of well hole lead to the length of the hoisting system rope is gradually increasing. Besides, the annual production capacity of coal mine increase gradually, this leads to the gradual increase of load and velocity of mine hoisting system. These changes propose higher demand of dynamic performance and hoisting capacity of mine hoisting system. However, the present domestic design of hoisting system still adopts the static and experience design method. The design method leads to bad dynamic performance of hoisting system and wire rope fracture and slippage. So it is necessity to research in the dynamic performance of hoisting system.Five-freedom dynamic model of floor-type multi rope friction hoisting system based on Lagrange equation has been established. The dynamic responses of the various degrees of freedom have been obtained by solving the dynamic model equation. Besides, the field test of Sima coal mine hoisting system has been completed. The correctness of the method to establish and solve the dynamic model has been verified by comparing the results of the field test and the solution of dynamic model.The dynamic response of floor-type multi rope friction hoisting system under rectangular acceleration and different trapezoid accelerations has been analyzed. The influence rule of the parameters of trapezoidal acceleration to dynamic performance of mine hoisting system has been concluded. The increasing of N and Kn are both good to improve the running stability of hoisting system. But the increasing of N will lead to the increasing of the accelerate time. The increasing of N will lead to the increasing of steel wire rope tension. The theoretical guidance to choose the optimal trapezoid acceleration to limit the start-up shock of mine hoisting system has been provided.The four-freedom dynamic model of tower-type multi rope friction hoisting system has been established. The optimal trapezoid acceleration operation curve has been obtained. The dynamic response of Gaohe mine hoisting system under the operation curve has been studied.In view of higher requirements to hoisting capacity, the method to improve the hoisting capacity of mine hoisting system that include adopting higher tensile steel wire rope and improving the speed has been studied with dynamic analysis method. A feasible plan has been obtained through the analysis of relevant example. The result will be reference for the choice of hoisting capacity reform project of the existing coal mine hoisting system.