The Design And Research Of The Lifeboat Hook System Based On Double Lifting Point

The ocean is a dangerous place. With modern high-tech level, the ship will still be a disaster. In order to guarantee the life safety of crew, the lifeboat as the main rescue equipment, plays a very important role in helping crew out of the shipwreck. The boat hook system for the release and recovery of the lifeboat, is key part on the lifeboat. The boat hook system can work directly related to the safety of personnel in the boat. At present, more and more boat accidents have been concerned and valued by International Maritime Organization, the classification society, the port state, and the latest amendment came into effect in 2013. In this paper, the technology of lifeboat hook system based on double lifting point is studied to solve the problem of lifeboat release.On the basis of studying lifeboat hook system development course and the present situation at home and abroad, according to the defects of the existing boat hook system,combined with the latest amendment requirements, this paper put forward a scheme that load pass hook center, can load and unload synchronous decoupling. The structure of the system is designed, including boat hook device, operation device and flexible shaft. System characteristics are that rings with a shaft sleeve greatly reduces the friction force and the torque; Torsional spring with automatic reset function improve the stability of the system;Surface structure design of the contact parts of side plate and ring eliminates the resistance torque generated by the lifeboat loads; Easy to disassemble and easy to maintain. The system has reasonable design, compact structure, safety and reliability, and is innovative,practical and scientific.SolidWorks is used to complete the establishment of three-dimensional model of the system, and the software HyperMesh and ABAQUS is respectively used to meshing and solving of parts, in order to complete the system key parts of structural analysis and optimum design and analysis the stress distribution of parts and validate the system reliability. A three dimensional model of gear and rack is established by the method of MATLAB and SolidWorks to be made more accurate, in order to laid the foundation for the simulation and analysis. At the same time the hook is optimized to reduce weight.The system mathematical model of the kinematics and dynamics is established to analyze the mechanism characteristics of kinematics and dynamics. The motion simulation analysis is carried out by using ADAMS in order to obtain the motion characteristic curve of the mechanism, and to verify the feasibility of the system. Compared with the theoretical calculation, ADAMS analysis is more close to the actual working conditions, taking contactand so on into account, and finally the system motion animation production is completed.According to the amendment requirements of the system test, the prototype test of the system is carried out, including the tilt test, no-load decoupling test, and the load decoupling test. Adding outside interference to system during tilt test process, like tilting device around20 degrees horizontal and around 10 degrees vertical to verify system whether will accidental decoupling under adverse sea conditions. Test results are further verified the rationality and reliability of the system structure design.