Abstract: At present,the domestic application of 1～5 t of demolition and removal of excavator machine tool head cut is still blank,and this kind of demolition cut tool head is one of the main equipments of domestic dismantling machine,these need to know its working mechanism to optimize the design.Therefore,it is designed a hydraulic dismantling machine on shear physical prototype,its structure was designed based on the physical characteristics and mechanical properties.The scissors body is gotten deformation nephogram and stress in a fixed load structure by ANSYS Workbench software.By analyzing the stress distribution of the scissors body and the causes of fatigue damage,it is found that the stress concentration is easy to cause fatigue damage to the structure at the handle, cutting edge and the front end of the scissors body.The structure and material of the scissors are optimized,and the replaceable kit is used for the first time.In the end,the results show that the optimized scissors have higher strength,more reasonable structure and longer service life.

Key words: hydraulic cylinder, hydraulic shear, stress analysis, design research