Design And Research Of Offshore Waste Salvage Device

The increasing of offshore waste has seriously exacerbated the problem of marine pollution,threatened the balance of marine ecosystem,and brought some influence on the survival of marine life and the development of coastal cities.In order to protect the marine environment and change the current situation of the increasing of marine waste,it is necessary to reduce the discharge effectively and solve the pollution of marine waste.Based on the previous research,this paper designs a kind of offshore waste salvage device.According to the design requirements,the fishing device has double functions of negative pressure suction and transmission.The main parts of each unit in fishing device are designed and simulated.The specific research contents are as follows:(1)Facing the increasingly serious pollution of marine waste,the research background of the subject is introduced,and the current research status of the existing salvage devices and salvage methods is summarized briefly;The paper expounds the application of negative pressure mechanism in vacuum cleaning and marine cleaning,summarizes the research status of offshore waste salvage device,combines the advantages of existing salvage devices with the advantages of negative pressure mechanism in vacuum cleaning and marine cleaning application,and puts forward the research topics in this paper.(2)According to the design criteria of mechanical structure,the structure and parameters of the main components such as suction unit,transmission unit and negative pressure unit are designed,then the structure design of other related devices of the ship is carried out.Then,the three-dimensional model of fishing device and compression device is established by using the 3D modeling software.(3)The paper analyzes and studies the active drum in the transmission unit.According to the belt driving principle,the tight side tension of the belt is calculated when the belt is about to slip;The force of the driving roller is studied by force analysis,and the stress value of the driving roller under the theoretical load is checked;Further,the static simulation analysis of the active drum is carried out to obtain the cloud diagram of the stress and strain of the active drum.It can be seen that the deformation value and the stress value are within the reasonable design range,which can meet the design requirements of the structural rigidity strength;The results of the theoretical analysis of the strength of the active drum are compared with the static simulation results.The relative error of the stress value of the active drum is 1.2%,which is in good agreement with the simulation results.(4)The internal flow field of the suction unit was analyzed by fluent numerical simulation and optimized design.The turbulence model and basic governing equations are established to lay a theoretical foundation for the next numerical calculation;Based on the suction port of the suction unit,a three-dimensional model of the suction port is established;The internal flow field of the suction unit under different factors was analyzed by fluent and the parameters of fishing conditions were optimized.By comparing the simulation results of velocity and pressure under different factors,it was found that the suction effect of the "pyramid" suction port was better under larger ship speed and depth;The optimization results show that when the speed is 35.2km/h and the underwater depth is 102 mm,the suction efficiency is significantly improved,the suction speed is increased by 12.3%,and the suction pressure is increased by 13.2%.(5)Based on the method of fluid solid coupling analysis,the structure of the suction port in the suction unit is simulated and analyzed with variable parameters.The basic equation of fluid solid coupling is established.The gauge pressure of the suction structure is introduced into the static analysis module.By comparing the stress and strain of the structure under different working conditions,it is worth noting that the ship speed is25.2km/h and the depth from the water surface is 150 mm.The stress and strain value of the "pyramid" suction port is small.(6)The numerical analysis of the internal flow field characteristics and the simulation of the fluid solid coupling are carried out for the negative pressure unit.The turbulence model is established and the turbulent and laminar flow are judged for the negative pressure unit flow field;The three-dimensional model of impeller was established,and the 3D model of impeller was introduced into fluent fluid analysis software,and the change trend of velocity and pressure in impeller basin was analyzed under different factors;The stress-strain analysis of impeller structure in negative pressure unit is carried out by using the numerical simulation method based on fluid solid coupling;The results of simulation calculation under different impeller speeds and different number of blades are compared.When the number of blades is 8 and the impeller speed is 16rad/s,the flow velocity unevenness at the outlet of the basin is relatively reduced,the negative pressure on the back of the blade is smaller,the cavitation part is less,and the suction speed of the negative pressure suction pump is relatively large;The deformation of impeller in the basin is relatively small,and the stress concentration mainly occurs at the root of the blade,and the blade root should be thickened.