Digital Platform Development For The Working Mechanism Of Mechanical Mining Shovel

With the foundation of the national high technology research and development plan（863plan）—“Design of75m3Large Scale Open Pit mechanical Mining Shovel（NO.2012AA062001）”, this paper focuses on the key technology for the workingmechanism of the large scale mechanical mining shovel. The main contents of this paperinclude the force analysis for key components of the working mechanism and intensitychecking，optimization design and the rigid-flexible coupling dynamic simulation analysis forthe working mechanism. On the basis, the digital platform of the working mechanism isdeveloped.Based on the relevant domestic and foreign literatures, the research and application statusof the mechanical mining shovel mechanism was summarized. In order to improve reliabilityand design level of the mechanical mining shovel mechanism, the working mechanism is forceanalyzed at any position in the mining process and turning process. The tangential and normaldirection of digging resistances act on the bucket tooth tip in the mining process, and theadditional loads act on the various components of the mechanism caused by centrifugal forceand inertia force in the turning process. Calculating out each hinge point force of the boomand dipper handle, the axial force diagram, shearing force diagram and bending momentdiagram can be draw. Then the dangerous section stress of the boom and dipper handle arecalculated and the strength is checked by using Strength calculation theory.On the basis of ideal logarithmic spiral trajectory curve movement, the optimizationmathematical model of the working mechanism of the mechanical mining shovel. isestablished, selecting the structure size parameters of the mechanism as design variables andselecting the angle between hoist cable and stick center line and the consumed powers of thelifting and crowding mechanism as the objective functions. According to comparison resultsbefore and after optimization for the working mechanism of the WK-75mechanical miningshovel, the power consumption is less and the comprehensive performance of the mechanismis further improved. By the finite element software HyperMesh and ANSYS and the multi-body dynamics software ADAMS, the rigid-flexible coupling dynamic simulation model ofthe WK-75mechanical mining shovel is established, and the boom and dipper handle are flexibility. By dynamic simulation analysis in the mining process and turning process, thenodes stress at the critical locations are obtained and the theoretical computation results areverified at the same time. This paper provides the safety performance evaluation of theworking mechanism.In this paper, based on the force analysis for key components of the working mechanismand intensity checking， optimization design and the rigid-flexible coupling dynamicsimulation analysis for the working mechanism, the digital analysis platform for the workingmechanism of the mechanical mining shovel is developed, to realize the stress calculation ofthe dangerous sections of the boom and dipper handle and strength check and to obtain theoptimal working mechanism and the node stress distribution curves at the critical locations ofthe boom and dipper handle in real time. The platform is convenient for designers of themechanical mining shovel and shorten the design cycle, providing theoretical guidance for thedesign of the working mechanism. It has a strong practical engineering value and improvesthe independent research and development level of the mechanical mining shovel.