Studies On The Removal Rust Forming By UHP Waterjetting Auto-Robot And Its Unit Technology

It is still a engineering knottiness how to make the de-rusting in Vessels area and others like chemical large-reservoir. Oxidizing zones called rust come into existence with Steel-planks corroding in seawater and oxidizing in air. Before coating the steel-surface, the rust must be removal first and that called "The surface Preparations" in standard technics. With the number NCSTE-2-1-JK2X-132, the project, "Ultra-high Pressure Water Jetting Surface Attaching Rust Removal Equipment" which is proffered by the Search Branch Found of Science Department, is being purchased by me now. Its goal is: Utilizing the high-pressure rotary waterjet with the pressure 200~250MPa to attaching rust removal; De-rust degree achieving "Sa2.5"; No re-rust after de-rusting; Rust residue recovered; De-rust speed achieving 50m2/h; It includes the following three parts: High-pressure pump units with pressure 250MPa and power 160kW; Attaching automatically robot system; Vacuum absorb system and residue displaced system. It is applied neo-technique in developed nations in 21st century and it is able to substitute traditional de-rust technology as hammer knock artificially/ sand jet with drying air. Because of the reduction of labor intensity /work cost /environment contamination, and excellent re-bust quality, the applied technostructure will be used in surface preparations of large-area steel surface.This text make conclusion and expound from the following eight parties:1 Resune the market background, technique aim, theory research and technique line of this issues. Conclude: the technique parameters of ultra-high pressure pure water-jet de-rusting is: pressure 200~250MPa; flow: 30L/min, this issues had fulfilled the aim.2 Discuss the profit and defect of all the waterjet de-rusting measure. Survey general international standard. Conclude: the unit technique of ultra-high pressure waterjet attaching de-rusting is advanced productibility in world de-rusting technique field. Submit the contents and thinks of this technique research.3 Study and discuss relative series theory of waterjet de-rusting. From internal and extrinsic specifity of waterjet, Reveal waterjet microscopic destroy mechanism, jet percussion andoptimum target disance are the visualized parameters of jet breakdown.4 The working conditions of ultra-high pressure waterjet de-rusting are: beyond single eylinder jet, roate some same jetgand form atomizing flow-yard; at the same time, because of the ultra-high pressue waterjet mixed lifing, the flow-yard come into temperature going up and pneumatoltsis. This text submits mathematical model and numerical simulation of the polyphase jet, based on just turbulence condition. Conclude: numerical simulation anastomosises with the testing result. Words to comparison, the stability and astringency of k-wmodel is more fit to be applied.5 Make the destroy mechanism model, of ultra-high pressure waterjet apply to rust, with mathematical measure. Through numerical analysis, conclude: de-rusting mechanism is: the multiple action generated by tangential force (generated with the nozzles mounted angle and rotary motion) and vertical direction collision force (generated with the waterjet), rust in the surface of Steel-planks shall be erosion and delaminated. The empirical model submits the relation between de-rusting ability and waterjet parameters.6 Dissert the assembly technique in detailed. Dissert the master technical problem of assembly technique form four sections: ultra-high pressure pump units; attaching robot; vacuum system and integral design. The reliability of this issues depends on reciprocating moving-sealing and rotary moving-sealing of ultra-high pressure pump, and the design of inlet and outlet valve, and etc. It dissects the theory designs of the three and define the designs experience of equipments reliability systematically.7 The applied technique must be detected through the testing. I establish the testing condition for the aim of appliance, and analyze the testing situation from micro-thought and macro-thought.