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挖掘机的功率损失主要是因为发动机与泵的功率不匹配造成的,开展泵流量影响因素的研究可以为控制系统调节泵吸收功率提供依据。以负流量液压系统为研究对像,以泵出口压力、回油负流量控制压力和电液比例阀二次压力作为影响泵流量的主要因素,在挖掘机动作过程中,使用便携式采集系统对相关量进行采集。试验结果表明,泵工作过程中的流量主要受二次压力影响;负流量控制压力主要作用于无负荷阶段,泵出口压力主要作用于溢流阶段,二者主要功能是压力切断,减少能量损失。
Excavator power loss is mainly due to the engine and pump power does not match the cause, to carry out the study of the impact of pump flow factors for the control system to adjust the pump to provide the basis for the absorption of power. Taking the negative flow hydraulic system as the research object, taking the outlet pressure of the pump, the control pressure of the negative return oil flow and the secondary pressure of the electro-hydraulic proportional valve as the main factors affecting the pump flow rate, during the operation of the excavator, The amount of collection. The test results show that the flow rate during the pump operation is mainly affected by the secondary pressure. The negative flow control pressure mainly acts on the no-load stage. The pump outlet pressure mainly acts on the overflow stage. The main function of the two functions is to cut off the pressure and reduce the energy loss.