【摘要】 采用恒功率柱塞泵作为轮式液压挖掘机的回转驱动动力源,提出了一种负流量控制方案。通过AMESim仿真确定复位弹簧刚度对系统回转控制性能影响,仿真测试和实际测试结果相符,说明仿真分析都是正确的。结果表明:随着复位弹簧刚度的增大,压力峰值时间也更长;随着复位弹簧刚度的增大,压力响应速度出现了变慢。在不同的复位弹簧刚度下获得了基本一致的阀出口流量最大值,但会引起控制阀换向过程形成不同的流量响应速度。增加控制阀开度的过程中形成了更大的流阻压力,压力达到6.23 MPa后达到稳定状态。系统流量响应速度相对压力响应存在一定的滞后性,而流量增大时则没有出现明显的脉动。更多还原

【Abstract】 The constant power piston pump were used as the rotary drive power source of the wheeled hydraulic excavator,and a negative flow control scheme is proposed. The influence of the return spring stiffness on the system’s rotation control performance was determined by AMESim simulation. The simulation results were consistent with the actual test results,which indicated that the simulation analysis is correct. The results show that the pressure peak time is longer with the increasing of the stiffness of the return spring. With the increasing of the stiffness of return spring,the pressure response speed becomes slower. The maximum flow rate at the outlet of the valve is basically the same under different return spring stiffness,but it will cause different flow response speed in the reversing process of the control valve. A larger flow resistance pressure is formed in the process of increasing the opening of the control valve,and the pressure reaches a stable state after6. 23 MPa. There is a lag between the flow rate response and the pressure response of the system,but no obvious pulsation occurs when the flow rate increases.更多还原