Abstract: As the key equipment to realize the mechanization, unmanned and automation of racking platform, the different working forms and arrangement schemes of pipe racking machine serious influence the design of derrick, racking platform and tripping operation. The design of luffing mechanism is closely related to the driving force and structural response. Base on a renovation project of a workover rig, the force characteristics and variation rule of each component under the two kinds of luffing mechanism arrangement of forward-arranged oil cylinder and backward-arranged oil cylinder in quasi-static process were studied by dynamic simulation analysis, and the influence of hinge point optimization design on load response was also studied. The results show that the scheme which cylinder is forward-arranged has a better structural response, which is suitable for the design of pipe racking machine under heavy load condition, but this approach may occupy more space. Hinge point optimization design can effectively reduce the driving force of luffing mechanism, while the structural load response is mainly determined by the mechanism design, and the appropriate arrangement of mechanism should be selected according to the load size. 

Key words: pipe racking machine, luffing mechanism, dynamic analysis, optimization design

摘要： 二层台排管机作为实现二层台机械化、无人化、自动化的关键设备，其不同的工作形式、机构布置方案对井架、二层台和起下钻作业流程设计具有重要影响。其变幅机构的设计方案与整个机构的驱动力和结构响应密切相关。以某型海洋修井机推扶式排管机为参考，通过动力学仿真分析研究准静态过程中油缸前置和油缸后置两种变幅机构布置形式下各部件的受力特点和变化规律，同时研究了铰点优化设计对载荷响应的影响。结果显示，油缸前置方案拥有更优的结构载荷响应曲线，适用于大工作载荷的二层推扶式台排管机设计，但变幅机构需占用更大的空间。铰点优化设计能有效降低变幅机构的驱动力，但结构载荷响应主要决定于机构布置形式，需按照载荷大小选取合适机构布置形式。

关键词: 排管机, 变幅机构, 动力学分析, 优化设计