汽车起重机吊臂伸缩时容易产生抖动现象,特别是当吊臂全部伸出或向上变幅达到最高位置后,执行缩臂动作或向下变幅动作时,吊臂抖动现象更为严重,常造成被吊货物失稳,难以操控,存在安全隐患。1.平衡阀阻尼孔堵塞为使吊臂伸缩平稳,防止发生载荷中击,在伸缩回路中设置了平衡阀,该阀由1个单向阀和1个溢流阀组成,其中溢流阀芯上设有阻尼孔,阻尼孔一 Jib crane telescopic crane prone to jitter phenomenon, especially when all the jib boom extension or up to reach the highest position, the implementation of the jib movements or downward movements when the boom jitter more serious, often resulting Lifted goods instability, difficult to control, there are security risks. 1. Balance valve damping orifice clogging In order to make the boom telescopic smooth, to prevent the load in the hit, set up a balance valve in the telescopic loop, the valve consists of a check valve and a relief valve, wherein the relief valve spool There is a damping hole, a damping hole