一、前言随着液压起重机的发展,提高超升速度,扩大调速范围,减少能耗及发热量等问题越来越引起人们的重视。为此,我们研究了一种多速起升机构液压系统。该液压系统由双联液压油泵、起升操纵阀、分合流阀、平衡阀、双马达控制阀、液压马达等组成。 I. INTRODUCTION With the development of hydraulic cranes, issues such as increasing the speed of super-lifting, expanding the range of speed control, reducing energy consumption and heat generation have attracted increasing attention. For this reason, we have studied a multi-speed lifting mechanism hydraulic system. The hydraulic system is composed of double hydraulic oil pumps, lifting and actuating valves, split and merge valves, balance valves, dual-motor control valves, and hydraulic motors.