Design And Research Of Tuna Longline Fishing Winch

Tuna is an important fishing resource in the world,which has the advantages of wide distribution,fast production speed,and high economic value.As an important fishing method for tuna,tuna longline fishing is also the main operating mode for tuna fishing in China at present.Compared to coarse rope,the slender length of the extendable fishing dry line is more prone to accidental breakage.In order to avoid breakage of the dry line,the stranding machine has higher requirements for transmission control accuracy and response speed.However,currently,most tuna long line fishing equipment on the market is hydraulic transmission.Due to hydraulic transmission relying on hydraulic oil medium to transmit energy,the transmission control accuracy and response speed are weaker than those of electric transmission equipment,In addition,the relevant equipment in China is generally backward compared to foreign countries,and most of the equipment used by fishing boats on the market is mostly advanced foreign equipment.Therefore,this article designs an electric tuna longline fishing winch that can control the tension of the dry line by automatically adjusting the motor speed,with the aim of reducing dry line breakage,improving the efficiency of tuna longline fishing operations,and contributing to the development and electrification of domestic longline fishing equipment.The research tasks of this thesis include the following aspects:(1)Understand the tuna longline fishing gear,analyze the characteristics,performance,requirements,working methods,and other factors of the storage equipment,and based on this,determine the requirements for the winch storage drum,the selection of the rope arrangement device,and the dry line tension control scheme,and complete the system design of the device.(2)According to the mechanical analysis of tuna longline fishing,the mechanical structure design calculation and strength check of the rope storage equipment and rope arrangement device in the winch system are carried out,the selection of the motor and reducer device of the rope storage equipment is completed,and the three-dimensional solid effects of the rope storage equipment,rope arrangement device and frame are drawn using the three-dimensional software Solidworks.Then use Solidworks Simulation to carry out finite element analysis on the designed rope storage drum,screw guide rail and screw guide wheel bracket,and check and calculate the strength.(3)Design the mechanical control system of the device,complete the selection of PLC,frequency converter and tension sensor,the design of rope retraction and release control flow,PLC interface distribution and hardware wiring diagram,and complete the control program ladder diagram through Siemens PLC,S7-200 SMART CPU SR40 special programming software STEP 7-Micro/WIN SMART.(4)The mathematical model of the control system is built,and the mathematical model is simulated and analyzed using MATLAB software.The anti-interference ability of the input interference analysis system is used to prove whether the designed rope storage drum motor control system has the function of stabilizing the dry rope tension.Through the study of the arm size of the dry rope changing with time,the control scheme of the motor speed in the rope retraction mode under stable tension is analyzed.The tuna longline winch designed in this thesis has basically completed the above research tasks.The research results have certain value for the tension control of the main line of tuna longline,and can provide theoretical reference for the industrialization of tuna longline winch.