兖州矿业(集团)公司机械制修厂根据液压支架在煤矿井下使用过程中液压油缸活塞杆损坏和维修中发现的问题开展了研究,针对液压缸存在的一些结构不合理和拆卸比较困难的状况进行了改进,并且提出了相关的合理化建议。他们在液压支架的维修中发现,有些型号的液压支架侧护千斤顶和插板千斤顶的活塞与活塞杆是采用螺纹来进行联接的。一般都是利用2个粗牙对顶螺母来防松。实践表明,其防松效果是很差的。一些螺纹在变载荷和液压的冲击下防松失效并 Yanzhou Mining (Group) Co., Ltd. based on mechanical maintenance plant hydraulic support in the process of using coal in the hydraulic cylinder piston rod damage and repair problems found in the study carried out for some of the hydraulic cylinder structure is not reasonable and demolition more difficult conditions for Made improvements, and put forward relevant rationalization proposals. They found in the hydraulic support repair, some models of hydraulic support side jacks and plug jack piston and the piston rod is used to connect the thread. Generally use two coarse teeth on the top nut to prevent loose. Practice shows that its anti-loose effect is very poor. Some threads fail to loosen and change under load and hydraulic impact