Safety estimation of high-pressure hydraulic cylinder using FSI method

Hydraulic cylinder is a primary component of the hydraulic valve systems.The numerical study of hydraulic cylinder to evaluate the stress analysis,the life assessment and the performance of operation characteristics in hydraulic cylinder were described.The calculation of safety factor,fatigue life,piston chamber pressure,rod chamber pressure and the change of velocity of piston with flow time after the beginning of hydraulic cylinder were incorporated.Numerical analysis was performed using the commercial CFD code,ANSYS with unsteady,dynamic mesh model,two-way FSI(fluid-structure interaction)method and k-εturbulent model.The internal pressure in hydraulic cylinder through stress analysis show higher than those of the yield strength.

一种双向三级等推力液压油缸的设计

针对传统多级液压油缸工作压力小,各级推力小且不等,活塞杆单向伸出距离长、挠度大,工作时稳定性和可靠性差、使用寿命短等缺陷,对其整体结构进行重新设计。采用不同的缸径和活塞杆直径,通过内部配油座合理排列组合,实现了三级等推力且推力较大;采用活塞杆双向伸出结构,使活塞杆单向伸出长度短,伸出挠度小,防止部件被啃伤。通过以上的改进,液压油缸的稳定性及使用寿命大大提高。设计的产品已获发明专利(ZL201310691041.5)。

液压拉伸器在UOE焊管生产线的应用

介绍了液压拉伸器在UOE生产线应用情况、液压拉伸器的主要结构及工作原理;重点描述了液压泵站类型及特点、拉伸油缸的结构及工作原理、不同类型的拉伸油缸及安全要求。结合C成型机拉杆螺栓,阐述了液压拉伸器预紧、松开顺序及注意事项,并对液压拉伸器在宝钢UOE焊管生产线使用中出现的典型问题进行分析及处理改进,结果表明,通过优化拉伸装置的分阶段使用步骤,各阶段采用对角顺序加载的方式对多拉杆进行拉伸,同时优化液压泵站,将其改为电动模式,扩展分配器回路,可完全满足设计要求,提高工作效率,避免螺纹拉伤及拉杆螺母和拉伸油缸螺母"屏住"等情况。