摘要
单出杆液压缸作为工程机械中最常见的液压执行器,由于其两腔面积的不对称性,造成了流量不匹配等问题;电动缸通过伺服电机驱动滚珠丝杠,解决了单出杆液压缸面积不对称的缺点,但受电机功率密度低的影响,难以满足重载工况下输出低速大扭矩的要求。针对上述问题,提出采用液压马达代替电动机驱动滚珠丝杠的方案,并通过开式泵阀分段控制方式对新系统进行闭环控制。结果表明:新系统可以实现快速、准确的位置控制;推杆在进给和回程阶段,压力、流量、速度完全相同,系统无溢流损失;当输入正弦信号的幅值为50 mm时,系统的带宽为0.8 Hz;系统具备良好的抗负载干扰能力。
Single rod hydraulic cylinder is the most common hydraulic actuator in construction machinery.Due to the asymmetry of its two cavities area,the flow mismatch is caused.The electric cylinder drives the ball screw through the servo motor,which solves the disadvantage of the asymmetric area of the single rod hydraulic cylinder.However,due to the influence of the low power density of the motor,it is difficult to meet the requirements of low speed and large torque output under heavy load conditions.To solve the above problems,a hydraulic motor was used to drive the ball screw instead of the motor,and the closed-loop control of the new system was carried out through the segmented control mode of open pump valve.The results show that the new system can realize fast and accurate position control.The pressure,flow rate and speed of the push rod are exactly the same in the feed and return stages,and the system has no overflow loss.When the amplitude of sinusoidal signal is 50 mm,the bandwidth of the system is 0.8 Hz.The system has good anti-load interference ability.
作者
倪豪
葛磊
赵斌
权龙
NI Hao;GE Lei;ZHAO Bin;QUAN Long(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan Shanxi 030024,China)
出处
《机床与液压》
北大核心
2022年第16期7-12,共6页
Machine Tool & Hydraulics
基金
国家自然科学基金青年科学基金项目(51805349)
国家自然科学基金面上项目(51875385)。
关键词
电动缸
液压马达
单出杆液压缸
滚珠丝杠
位置控制
Electric cylinder
Hydraulic motor
Single rod hydraulic cylinder
Ball screw
Position control
