Abstract:

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.

Key words: hydraulic scissors, remote handling, structure design, anti-twisting