中国散裂中子源遥控维护液压剪刀防扭刀刃结构设计

Anti-twisting Blade Design of Remote Handling Hydraulic Scissors in China Spallation Neutron Source

中国散裂中子源(CSNS)的运行维护需要对活化的慢化器反射体进行定期的远程更换。在慢化器反射体遥操作维护工艺的设计中,最关键的一个工序是管道的剪切。传统的管道剪切工艺采用标准液压剪刀加装长柄工具实现远距离的剪切操作。由于管道位于深井环境,长柄与水平液压剪刀的组合方式在剪切操作时会存在管道扭曲,从而造成剪切效果不理想的情况。提出一种基于逆向工程与有限元分析相结合的防扭刀刃设计方法,通过逆向建模剪切刀刃、应力分析模拟剪切过程的应力分布以及对打孔位置进行优化设计等技术手段,有效地解决了遥控剪切自由管道时,剪刀与管道的姿态不协调问题,从而保护了刀具免受扭曲的管道造成的刀头损坏,并且提高了剪切效率。

China spallation neutron source（CSNS）, as one of the most important large scientific facilities in the ＂Eleventh Five-Year＂ period in China, its operation and maintenance includes the remote handling tasks of exchanging the moderator reflector plug which is activated by energetic particles. The most critical step is to cut the multilayer pipes in one operation. The traditional process used the general hydraulic scissor with a long-handled tool to cut the pipes which will twist, resulting in the bad shear effect. An anti-twisting blade design is presented, combining the reverse engineering method with the finite element method, which effectively solves the remote handling problem when cutting the unconstrained pipes by means of the cutter reverse modeling, the static stress analysis and the optimization design technology, that＇s the inconsistent posture problem between the scissor and pipes, thereby protecting the scissor from damage caused by distortion of the pipeline, and improve the shear efficiency.