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当前传统液压挖掘机在一次工作循环中,回转过程的能量消耗约占总能量消耗的25%~40%,其中回转动能很大一部分都通过溢流阀损失,最终以热能的形式而散发掉。为此,该文基于二次调节技术构建液压挖掘机回转系统,利用仿真软件AMESim建立了整个系统的仿真模型,并根据液压挖掘机回转90度的典型工况,进行挖掘机回转制动能量回收效率的节能仿真研究,结果表明:系统总的制动能量回收效率可达到η=62.4%,在相同的工况下比普通液压挖掘机节能24.7%。与此同时,该文应用该仿真模型,对影响能量回收效率的因素进行定性研究,结果表明:随着转动惯量的增大或系统压力提高,能量回收效率η及节能效率η_s均增大;而随着蓄能器容积的增大,能量回收效率η几乎不变,节能效率η_s明显减小。
Current traditional hydraulic excavators in a work cycle, the energy consumption of the revolution about the total energy consumption of about 25% to 40%, in which a large part of the rotational energy loss through the relief valve, and eventually dissipate the form of heat . Therefore, based on the secondary adjustment technology, this paper constructs the hydraulic excavator slewing system, and uses the simulation software AMESim to establish the simulation model of the whole system. According to the typical working condition of the hydraulic excavator turning 90 degrees, the rotary braking energy recovery The results show that the total braking energy recovery efficiency of the system can reach η = 62.4%, which saves energy 24.7% under the same conditions compared with the conventional hydraulic excavators. At the same time, this paper applies the simulation model to qualitatively study the factors that affect the energy recovery efficiency. The results show that the energy recovery efficiency η and the energy saving efficiency η_s increase with the increase of the moment of inertia or the increase of system pressure. As the accumulator volume increases, the energy recovery efficiency η almost does not change, the energy saving η_s significantly reduced.