Blades Design And Research On The Cutting Force Of A Deep-sea Hydraulic Wirerope Cutter

Since the new century,ocean exploration and technology has gradually become a hot field in the world,human activities are becoming more and more frequent.At the same time,due to the complexity and unknowability of the marine environment,marine accidents occur now and then.Therefore,establishing and improving the emergency rescue system for deepsea salvage are both the need for our country to catch up with the world’s advanced marine technology level and to ensure the safety of life and property of Chinese marine personnel.In common deep-sea salvage operations,the hydraulic wirerope cutter is widely used because of its high cutting efficiency and strong ability.However,there are two crucial problems in the existing cutters: one is that the blades are easily damaged,which are easy to failure in the forms of flanging and notching etc.;the other is the design theory of cutter is imperfect,in particular,the design of cutting force is still in the stage of experimental design,which cause the high design cost and affect the underwater portability of cutter.Aimed at the two key problems,the research work was carried out in this paper.The main results are as follows:Firstly,two typical cutting modes had been analyzed and for the axe-mode adopted in this paper,the main reason for the failure of the existing blades were analyzed and found.Based on that,a new structure of blades was put forward,which improved the contact status and lifetime of blades;Secondly,different from the conventional experiment method,in this paper,the cutting process of wirerope had been studied combining with finite element technique and an effective theoretical evaluation method of cutting force was put forward.Lastly,the water resistance and deep-sea performance of the cutter were tested qualified with the pressure testing device of Shanghai Jiao Tong University and the "Ocean six" scientific research vessel of the Guangzhou Marine Geological Survey.The research work of this paper has enriched the design theory of the wirerope cutter.And the test results show that the new blades structure can improve the life of blades significantly and the cutter can meet the needs of high working reliability demands in the deep-sea environment.