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起重吊装机械在作业时,其吊臂在重力作用下下落时,变幅缸经常出现低频率抖动现象,严重影响起重吊装机械的工作性能,甚至可能造成吊臂折断事故。为解决吊臂下落时变幅缸低频率抖动问题,许多生产厂家采取在变幅液压回路中增设二次溢流阀的方法加以解决。本文采用仿真分析与试验验证相结合的方法,优化二次溢流阀压力值,以减轻变幅缸低频率抖动,提高起重机吊装作业的稳定性。1.吊臂变幅液压回路工作原理吊臂变幅液压回路如图1所示。当换向阀3阀芯处于左位时,定量泵1输出的压力油经换向阀3、平衡阀5到达
Lifting hoisting machinery in operation, the crane under the action of gravity falling, luffing cylinder often appear low frequency jitter phenomenon, seriously affecting the performance of lifting and lowering machinery, and may even cause the boom broken accident. In order to solve the problem of low frequency jitter of variable amplitude cylinder when the jib is dropped, many manufacturers adopt the method of adding a secondary relief valve in the variable amplitude hydraulic circuit to solve the problem. In this paper, a combination of simulation analysis and experimental verification methods to optimize the pressure value of the secondary relief valve to reduce the low-frequency jitter amplitude luffing cylinder to improve the stability of crane lifting operations. 1. Boom luffing hydraulic circuit works Boom luffing hydraulic circuit shown in Figure 1. When the valve spool 3 is in the left position, the pressure pump 1 output pressure oil through the valve 3, the balance valve 5 arrived