Research On Dynamic Characteristics Of Lifting System Of Super Kilometer Vertical Shaft

With the increasing demand of energy consumption and the shortage of shallow resources in China,exploration and development of deep resources has become an inevitable trend of resource development in China.The construction of mine hoisting system has become an important bridge for the exploitation and transportation of deep resources,connecting the underground with the ground,and making the underground deep resources "transparent".The mine hoisting system undertakes the transportation tasks of deep resources,underground and ground workers and working equipment,etc.The hoisting wire rope is an indispensable and important part of the mine hoisting system and a key link connecting the driving part of the hoisting system and the hoisting container.Therefore,aiming at the dynamic response of lifting vessel under different working conditions,different excitations and multi-rope coupling,it is extremely urgent to carry out in-depth study on coupling dynamics of super-kilometer vertical shaft lifting system through accurate physical model and numerical solution method,aiming at mastering the strong time-varying rigid-flexible coupling mechanism of large disturbance,revealing the longitudinal vibration,transverse vibration and torsional vibration mechanism of multi-freedom,large-scale and strong time-varying flexible lifting system,and accurately predicting the dynamic characteristics and safety and reliability of super-kilometer vertical shaft lifting system.Firstly,according to China's ?Coal Mine Safety Regulations?,the selection of hoisting wire rope is carried out for the hoisting system of over 1000 meters vertical shaft under different working conditions;At the same time,the ultimate lifting capacity of over 1000 meters single rope winding vertical shaft lifting system and multi-rope friction vertical shaft lifting system under different influencing factors is analyzed Furthermore,according to Costello wire rope theory,the linear expression of stiffness coefficient of wire rope is derived.Secondly,this paper studies the dynamic characteristics of the over-kilometer flexible guide single-rope winding hoisting system,modeling the hoisting wire rope and the guiding wire rope as continuous chords,establishing the dynamic model of the flexible guide single-rope winding hoisting system by combining Lagrange equation with constraints and hypothetical modal method,and solving it numerically by using the generalized-? numerical method with second-order accuracy,and obtaining the tension distribution characteristics of the hoisting wire rope and the dynamic response characteristics of the hoisting container and the guiding wire rope under the longitudinal and transverse excitation of the hoisting wire rope.Then,this paper studies the dynamic characteristics of the multi-rope friction vertical shaft hoisting system,modeling the hoisting wire rope and the balance tail rope as continuous chords,combining with Lagrange equation with constraints and assumed modal method,establishing the dynamic model of the multi-rope friction vertical shaft hoisting system,and using the generalized-a numerical method with second-order accuracy for numerical solution,obtaining the tension distribution characteristics of the hoisting wire rope and the dynamic response characteristics of the hoisting container and the balance tail rope under the longitudinal and transverse excitation of the hoisting wire rope.Finally,aiming at the dynamic response of the dynamic model of multi-rope friction vertical shaft hoisting system,it is verified by field test.Three-way acceleration sensor and oil pressure sensor are used to measure the vibration and tension characteristics of hoisting rope,and the experimental results are compared with the simulation results to verify the accuracy of the physical model and the effectiveness of numerical solution.