| With the rapid development of offshore oil industry, Some of the early oil Wellsresources drying up and platform are abandoned, According to relevant laws, Had to demolisha lot of offshore platform and subsea well oral. However, Affected by the working condition,conventional cutting methods are hard to maturely apply at the undersea pipe cutting work,meanwhile deep water cutting technology started late in china, Basic market wasmonopolized by the foreign companies. Therefore analyzed the lack of the existingmechanical cutting, blasting demolition, chemical cutting and water jet technology, UnderseaPipe Cutting Tool Based on Electric-Arc Cutting is proposed. Main research content thefollowing four points.First, Determine the overall design scheme based on the design requirements of the deepwater pipe cutting device, Then designe two sets of deep water pipe cutting device experimentplatform based on the arc cutting. Mainly includes electrode feeding mechanism design,rotation mechanism design，which using to drive the electrode feeding mechanism continuousrotating, Mechanism device has a good insulation with the realization of power signal and thecontrol model transfer at the same time.Secondly, PMAC control circuit is designed which Based on the arc cutting, Include itshardware structure and software design. Hardware structure include motion control card, ADboard, switch board, I/O board, handwheel controller, and voltage electric current detectioncircuit. The mainly work of Software design is develope the real-time control program,Include the system motion control prog ram, the A/D acquisition program, the servo controlprogram, the definition of I/O ports, manual motor control program, the handwheel control and limit control program.Thirdly, Design a20V/500A power source with arc ignition circuit，Mainly design thearc processing function parameters of power supply, Select the topology of the power supply,Design the DC/DC converter parameters. DC/DC converter parameters Include the maincircuit parameter design, high frequency transformer, PWM pulse width control circuit andparameter design. Then design a set of high frequency and high voltage DC Chopping arcignition circuit, And development the online.PC control software.Finally, Finish a series of cutting process experiments, Main research processingparameters are tool polarity, dielectric, electrode material and width, pulse width, interpulse,peak voltage and electrode rotation speed，To study the effect of them on MRR and EWR. |
