The problems in operations of the range-changing mechanism,tensing device and fuel tank system in the hy- draulic system of DQL1200/800 bucket-type material stacking and taking machines must be solved in a technological innovation on it.
针对DQL1200/800斗轮式堆取料机液压系统进行技术改造,主要是该系统的变幅机构、张紧装置和油箱系统在使用过程中存在着较多问题,必须在生产实际中加以解决。