兖州矿业(集团)公司机械制修厂根据液压支架在井下使用过程中发生的半环式液压缸损坏和维修情况开展了研究,针对结构不合理和拆卸困难的状况进行了改进。半环式液压缸导向套一般在2个端面各自都存在A和B两个台阶。A、B段精度与公差等级都相同,和外缸的配合间隙也相同。在装配过程中,同一个方向有2个配合面,要使这2个面同时配合非常困难,实际上几乎不可能。他们把A面距离加长,精度等级比B段面高一级,让其作定位面。这样,缸体和导向套的密封面都缩短了,也减小了装配时密封进入的距离,从而减小 Yanzhou Mining (Group) Co., Ltd. based on mechanical repair shop hydraulic support in the process of using downhole half-ring hydraulic cylinder damage and maintenance carried out a study for the irrational structure and disassembly of the situation has been improved. Half-ring hydraulic cylinder guide sleeve generally exist in two end faces A and B two steps. A, B segment accuracy and tolerance levels are the same, and the outer cylinder with the same gap. In the assembly process, the same direction with two mating surface, to make these two surfaces with very difficult at the same time, in fact, almost impossible. They lengthened the distance from the A surface to a higher level than the B surface, making it a locating surface. In this way, the sealing surfaces of the cylinder block and the guide sleeve are shortened, reducing the distance the seal enters during assembly, thereby reducing