Improvement design and experiment of squid jigging machine

Abstract: The squid resource is rich and widely distributed, which is an important economic cephalopod fishery resources. Squid jigging fishery is one of pillar industry in China ocean fisheries. There are 2 kinds of operation form in squid jigging fishery, one is hand line and the other is squid jigging machine. As a major component of squid jigging fishery, the squid jigging machine relies on import currently and the domestic research is still in a primary stage. To enhance the localization level of squid jigging machine, the improved design of power system, control system, control panel and protection device which are the main parts of squid jigging machine are discussed in detail. The overall structure is consisted of machine case and roller. The motor, reducer, control power, intelligent module, controller and a driver with protection circuit are installed in the machine case. The control power, intelligent module and driver connect with the controller through socket outlet, which is convenient for components maintenance and replacement. The power system of squid jigging machine adopts AC servo drive combined with AC servo permanent magnet synchronous motor. The encoder installed on the motor shaft back-end, which resolution is 210 pulses per revolution. The overload capacity is three times the rated torque. The response frequency of frequency converter is 2 kHz and the speed range is 1:10 000. The improved power system have the advantages of fast response, wide range of speed and complete protecting functions. The control system including fishing line releasing sub-control system, fishhook shaking sub-control system, fishing line rolling up sub-control system and the stop sub-control system. The control panel matches the digital tube display with graphic display screen, which is made of light emitting diode display, dot-matrix graphic liquid crystal display, status indicator lamp, alarm buzzer, main control chip, waterproof panel and waterproof box. The new graphic display can provide detailed technical data and real-time information of squid jigging machine. Through the compare of display content, operator can get more information of human-computer interaction, which improves the reliability and usability. The intelligent anti-overloading function, 0 position and limit position protection and the lack of phase alarm measures were designed as protection device. The intelligent anti-overloading function can limit the output of the power system to avoid overload operation, and can allow the machine operating over the rated torque under the low load rate condition to reduce the failure rate of power system. The sea trials were conducted in the waters off Peru squid fishing grounds from June 23 to July 12, 2014. The MY-7 squid jigging machine made by Japan Towa Denki Seisakusho CO, LTD was served as control machine. The results showed that the experimental squid jigging machine operated stability and the total catch was 2 493 kg. The total catch of control machine was 2 472 kg. T-test result shows that there was no significant difference between the experimental machine and the control machine (P>0.05).