The Development Of Small Intelligent Continuous Conveyance System For Fishing

With the improvement of people’s material living standard,people’s demand for fish and shrimp and other aquatic products is gradually increasing,so China’s fishery has ushered in the era of steady development.Aquaculture and marine fishing are also booming.Traditional fishing methods are often characterized by excessive labor intensity,low efficiency and high fish mortality,which seriously affect the economic benefits of fishery.In view of the above problems in traditional fishing,the project carried out the hydrodynamic design and performance optimization of fish suction pump and the design of catch transport control system.In this project,the prototype of underwater fish suction pump and the equipment of intelligent fishing transport system based on fuzzy PID control are developed.The development and application of this equipment will help to solve the problems of low efficiency and high catch casualty rate in traditional fishing.The equipment can improve the efficiency of catch transport.The main research contents of this thesis include:1)This thesis carried out the hydrodynamic design and performance optimization of fish suction pump.The author analyzed and studied the three-dimensional modeling characteristics of the volute and impeller of the fish suction pump,divided the fluid mesh model of the fish suction pump,and carried out the flow field analysis of the fish suction pump.Combined with the calculation of the rotating basin of the fish suction pump,the calculation and analysis of the steady flow field and the unsteady flow field were carried out to obtain the optimal hydraulic model of the fish suction pump,and the prototype of the fish suction pump was developed;2)In this paper,the design of fish suction pump control algorithm.Based on the principle of frequency conversion speed regulation,the structure and composition of frequency conversion speed regulation controller and fuzzy PID control algorithm of intelligent fishing transportation are studied;3)In this paper,a fish suction pump control system is developed.With programmable logic Controller(PLC)as the core controller,the author uses Delta WPLSoft software to write the running program of intelligent fishing continuous transportation system,and constructs the monitoring window of upper computer through Kingview;4)The system performance was tested.The shore-based intelligent fishing system was developed by integrating the prototype of fish suction pump with the designed intelligent control system,and the experimental performance was tested.Through calculation and analysis,it is found that the outlet velocity distribution of the fish suction pump is uniform and the outlet pressure pulsation is small,which can meet the functional requirements of the fish suction pump.The simulation model is established to verify the tracking effect of the fuzzy PID control system on the sucking fish change rate and adjust the output frequency of the inverter dynamically.The results show that the intelligent fuzzy PID control can increase the robustness of the system and reduce the steady-state error of the system,which verifies the feasibility of the fuzzy PID control system in the PLC fish sucking control system of frequency conversion speed regulation.At the same time,tests were carried out on the developed underwater fish suction pump and shore-based fishing system.The results show that the head of the research results is up to 14 m,the flow rate is up to 70m~3/h,and the catch damage rate is less than 5%.All aspects meet the engineering design requirements,and the automation level of the operation is improved in the process of fishing transport.It has the advantages of simple operation,high efficiency and low rate of fish body damage.