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为减轻WYD260矿用液压挖掘机工作装置质量,采用多体动力学方法,建立了工作装置刚柔耦合模型,分析了工作装置各位置斗杆液压缸挖掘力、铲斗液压缸挖掘力及工作装置强度,在斗杆液压缸最大挖掘力位置,工作装置动臂、斗杆静态应力最大。采用离散元方法,建立了矿山岩石离散元模型,分析了斗杆挖掘工况铲斗的动态挖掘阻力,并分析了工作装置挖掘、举升、回转过程中动臂、斗杆的受力与应力,得到了斗杆最大动态应力与工作装置位置的关系。对比斗杆静态最大应力、动态最大应力,认为最大应力对应的斗杆受力为斗杆最大外载荷。采用有限元拓扑优化方法,施加斗杆最大外载荷,对斗杆进行了结构优化,使斗杆质量减轻了2.3 t。研究结果表明,通过工作装置结构强度分析与拓扑优化方法,能够达到工作装置轻量化设计的目的。
In order to reduce the working quality of WYD260 mining hydraulic excavator, multi-body dynamics method was used to establish the rigid-flexible coupling model of the working device. The hydraulic excavator digging force of the working device, the digging force of bucket cylinder and the working device Strength, the maximum digging force in the hydraulic cylinder arm, working device boom, arm static stress maximum. Discrete element method is used to establish the mine rock discrete element model. The dynamic excavation resistance of bucket in bucket excavation condition is analyzed, and the stress and force of boom and bucket in excavation, lifting and turning of working equipment are analyzed. , The relationship between the maximum dynamic stress of the arm and the position of the working device was obtained. Compared with the maximum static stress and dynamic maximum stress of the stick, the maximum stress is considered to be the maximum external load of the stick. By using the finite element method, the maximum external load of the arm was applied to optimize the structure of the arm and reduce the mass of the arm by 2.3t. The research results show that the purpose of lightweight design of working equipment can be achieved through structural strength analysis and topology optimization of working equipment.