The Key Technology And Climbing Wall Experiments Study Of The Ship Rust Removal Based On Ultrahigh Pressure Pure Water Jet

Shipbuilding industry is one of the supporting industry in china, which is not only high-tech but also heavy workload concentrated regions. Rust removal is large labor intensity, serious pollution and covering a wide range, but it is the necessary process in shipbuilding industry. Complete equipment for ultrahigh pressure water jet hull rust removal uses pure water as medium, and gets the rust removal energy through ultrahigh pressure heavy power pump unit. Water hydraulics has advantages of environmental friendly, cleanness, safety, readily available, inexpensive, and easily disposable. Ultrahigh pressure water jet rust removal uses the impact action and water prying action to destructed the adhesive force between corrosion and ship wall, and it is suitable for hull rust removal with high quality, high efficient and clean.In this thesis, the ultrahigh pressure pure water jet rust removal mechanism, the stripping impact characteristics, and the key technology of complete equipment ship rust removal were studied by theoretical analysis, prototype development and experimental study. The ultrahigh pressure pure water jet rust removal mechanism was analyzed, the ultrahigh pressure pure water jet modeling was established. The test bench of the ultrahigh pressure pure water jet rust removal was designed. The coating removal effects in different roatation of nozzle and climbing velocity were analyzed, and the rust removal effects in microscopic method were studied.The impact modeling was established according to the mechanical principle, the rotation water jet experiment was shown. The ultrahigh pressure pure water jet modeling was established, and the stripping impact velocity field was simulated. The velocity experiment shows that the modeling is reliable. The flow field characteristics such as different pressure, different diameters and different target distance were analyzed. The analysis results show that, there is a velocity accumulation area with large energy in the velocity core, the best impact effect is the pressure 200MPa and the diameter 0.3mm, and the different target is bigger then the impact velocity is higher in the ideal state.An ultrahigh pressure water jet pump package system for hull rust removal was designed. The main function, main parameters and design index was discussed. The water treatment unit before pump and electric control system were described. The energy loss and ultrahigh pressure sealing technology were analyzed. And a prototype structure was given. It provides a design reference for the study of ultrahigh pressure water jet pump package system for hull rust removal. The performance of the prototype through the SEM experiments were made, the rust and coating removal results show that, the effects of rust and coating removal with ultrahigh pressure pure water jet may reach the standard Sa2.5.