大型液压挖掘机回转系统启动特性及节能研究

发布时间：2018-03-16 10:24

本文选题：液压挖掘机　切入点：回转系统　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：回转系统作为液压挖掘机的重要子系统之一,其工作性能直接影响挖掘机整机性能。大型液压挖掘机回转系统具有典型大惯性负载系统的特点。由于整机质量和负载质量大,其回转系统的启动性能较差。本文对大型液压挖掘机回转系统的启动特性进行理论研究和仿真分析,为改善大型液压挖掘机回转系统启动节能性能找到了有效途径。论文的主要工作如下：对大型液压挖掘机回转启动时回转平台的运动规律、回转系统的负载特性、回转与动臂液压回路的流量分配特性进行分析。利用液压分析软件AMESim和动力学分析软件ADAMS建立液压挖掘机回转系统的机械-液压联合仿真模型,并通过实验对仿真模型的正确性进行验证。仿真分析回转平台转动惯量、摩擦力矩、马达排量、减速比以及回转溢流阀设定的压力对回转启动性能的影响。通过仿真分析,得到了回转启动溢流损失过大的主要原因。针对回转启动溢流损失过大的问题,提出了回转溢流切断控制回路的优化方案,搭建了优化方案的机械-液压联合仿真模型,利用该模型分别对回转平台180单回转动作和回转与动臂下降复合动作进行了联合仿真,将仿真结果与优化前的仿真结果进行对比分析,优化方案在不影响回转启动性能的情况下,节能效果显著。
[Abstract]:Abstract: Rotary system is one of the important subsystems of hydraulic excavator. Its working performance directly affects the whole machine performance of excavator. The rotary system of large hydraulic excavator has the characteristics of typical large inertial load system. The starting performance of the rotary system is poor. In this paper, the starting characteristics of the rotary system of the large hydraulic excavator are studied theoretically and simulated. An effective way to improve the starting energy saving performance of the rotary system of large hydraulic excavator is found. The main work of this paper is as follows:. This paper analyzes the motion law of the rotary platform, the load characteristics of the rotary system and the flow distribution characteristics of the hydraulic circuit of the rotary and arm during the rotary start-up of the large hydraulic excavator. By using the hydraulic analysis software AMESim and the dynamics analysis software ADAMS, the mechanical-hydraulic joint simulation model of the rotary system of hydraulic excavator is established, and the correctness of the simulation model is verified by experiments. The moment of inertia of the rotary platform is simulated and analyzed. The effects of friction torque, motor displacement, deceleration ratio and pressure set by rotary relief valve on the performance of rotary starting are analyzed. Aiming at the problem of excessive overflow loss in rotary start-up, the optimization scheme of rotary overflow cutting control loop is put forward, and the combined mechanical-hydraulic simulation model of optimization scheme is set up. The model is used to simulate the single rotation action of the platform 180 and the composite action of the rotation and arm descent respectively. The simulation results are compared with the simulation results before optimization. The optimized scheme has remarkable energy-saving effect without affecting the performance of rotary startup.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU621

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