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1台使用了2年的QUY350型履带起重机,在转移作业场地的途中,右行走突然失去控制,即无论是否操纵右行走操作手柄,该起重机右行走均有向前行走的趋势,但不能正常前进或倒退。1.工作原理该起重机行走液压系统采用双泵、双马达结构,即左、右行走机构各有1个变量泵、1组控制主阀和1个变量马达,各自独立驱动。右控制主阀为力士乐MO-5205一00/4MO型电液控制阀,其原理如图1所示。该阀为四联阀,除控制右侧履带行走外,还分别控制主变幅机构、主起升机构Ⅱ和主起升机构Ⅲ。右控制主阀右行走阀片
A 2-year-old QUY350 crawler crane suddenly loses control of the right-hand walk on the way to the job site, which means the right-hand walk has a tendency to move forward without turning the right-hand handle, but it can not move forward normally Or backwards. 1. Working principle The crane hydraulic system used dual-pump, dual-motor structure, that is, left and right travel agencies have a variable pump, a control valve and a variable motor group, each independently driven. Right control main valve Rexroth MO-5205 a 00 / 4MO type electro-hydraulic control valve, the principle shown in Figure 1. The valve is a four-way valve, in addition to controlling the right crawler walking, but also control the main luffing mechanism, the main lifting mechanism Ⅱ and the main lifting mechanism Ⅲ. Right control main valve Right travel valve