Research And Simulation Analysis On The Quick-change Connector Of Underwater Toolkit

Quick-change connector of underwater toolkit(referred to as the quick-change connector)is the main component of underwater operating system,some foreign countries have distinct advantages over China in the field of underwater switching technology and equipment.According to the Heilongjiang Provincial Science Fund project “Reliable switching mechanism and experimental research on the quick-change connector of deep-water operation system”,an independent quick-change connector was developed for the switch of underwater tools which is suitable for 500 meters water depth on the basis of the related key technologies analysis and the operation requirements of underwater switching device combination.These have great realistic significances for improving Chinese technological level in this field.Firstly,this paper introduces the development of underwater operating system and the key technology of underwater switching device at home and abroad.The overall designing scheme of quick-change connector was proposed by combining with the project requirements.The main structure including guiding device,locking device,and oil docking device of the quick-change connector were designed.And then the operation flow of quick-change connector was planned according to the design.The non-returning oil docking device and the locking device of quick-change connector were designed,respectively,according to the parameters,technical requirements and characteristics summary of quick-change connector.The main parameters of the male head and female head springs in the oil docking device were calculated to ensure the docking device can keep sealing in the depth of 500 meters under the water.The reliability of sealing rings of the docking device was verified by using Ansys Workbench to get the contact pressure between the sealing ring and the sealing face.The axial locking force in the process of oil docking was estimated,and the parameter selecting and size checking of the trapezoidal helical part of the locking device were carried out to ensure its reliability.Finally,the contact analysis of the helical sub-region in the locking device was carried out to verify the strength requirements of the trapezoidal threaded teeth,and the modal analysis of the locking drive shaft wsa carried out to study its dynamic performance so as to avoid the damage caused by the vibration of the quick-change connector.According to tolerance parameter,the guiding device of the quick-change connector was designed.In order to calculate the interface tolerance and modify design parameters,the position adjustment of the quick-change connector in the docking process was analyzed and calculated according to geometrical and frictional conditions,and the mathematical model was established.This paper determinates parameters of the quick-change connector by tolerance range obtained theoretically through Matlab software.Through the ADAMS software,the docking simulation experiment was carried out under the condition that the quick-change connector was in various typical limit posture deviation,and the tolerance range and the correctness of mathematical model were verified.In this paper,the influence factors of the contact force during the docking process were analyzed and simulated,and the influence of conical angle of the guide groove,initial adjusting thrust and friction coefficient on the contact force were obtained.Based on the analysis of the flow characteristics of hydraulic oil in the oil docking device of the quick-change connector,a mathematical model describing its movement rule was established.By using FLUENT software to simulate the steady-state flow field in the oil docking device,the influence of the top opening and the core structure of the one-way valve on its flow resistance characteristics were obtained.According to the distribution characteristics of cavitation phenomenon on the surface of the valve body at different inlet velocity in the flow field area,the improvement scheme of the valve body structure was put forward,which effectively reduces the cavitation damage to the surface of the valve body.Finally,the dynamic simulation of the oil docking process was carried out to verify the rationality of the structure design of the oil docking device.