scholarly journals Influence of Processing Parameters on Coating Removal for High Pressure Water Jet Technology Based on Wall-Climbing Robot

2020 ◽  
Vol 10 (5) ◽  
pp. 1862 ◽  
Author(s):  
Feifei Zhang ◽  
Xuerong Sun ◽  
Zhanpeng Li ◽  
Imran Mohsin ◽  
Yanan Wei ◽  
...  
Keyword(s):  
High Pressure ◽  
Processing Parameters ◽  
Water Jet ◽  
Climbing Robot ◽  
Shipbuilding Industry ◽  
Technical Problems ◽  
Sand Blasting ◽  
Pressure Water ◽  
Coating Removal ◽  
High Pressure Water Jet

The shipbuilding industry is very important for many countries. As an essential process in the shipbuilding industry, surface preparation (or coating removal) is gaining more and more attention. The traditional process used for ship hull coating removal is a sand-blasting process, which is harmful to the environment and inefficient. Recently, high pressure water jet technology has been developed to replace the traditional sand-blasting process. However, there are still many technical problems to be solved. In this paper, one wall-climbing robot was developed to remove coating based on high pressure water jet technology. Coating removal experiments under various experimental conditions were carried out and the corresponding coating removal rate for each case was obtained and compared. In addition, numerical simulation based on Fluid software was conducted to observe the water jet process more visually. Results show that the processing parameters, including the water pressure, travelling speed, inclined angle, and stand-off distance, can greatly influence the coating removal effect. The optimal processing parameters are obtained to guide the application of the high pressure water jet technology based on the designed wall-climbing robot for the shipbuilding industry.

Preparation and Application of the Integrative Hydraulic Drilling and Reaming Completely Technology

2013 ◽  
Vol 734-737 ◽  
pp. 892-897
Author(s):  
Jian Jun Cao ◽  
Yong Jiang Zhang ◽  
Zun Yu Xu ◽  
Ben Qing Yuan
Keyword(s):  
High Pressure ◽  
Working Condition ◽  
Large Diameter ◽  
Water Jet ◽  
System Structure ◽  
Gas Release ◽  
Technical Problems ◽  
Process Characteristics ◽  
Pressure Water ◽  
High Pressure Water Jet

The effect of gas extraction would be significantly increased by the way of coal section drilling hole diameter expansion. For the existing technical problems and limitating of constructing large diameter borehole directly or using the reaming way of SKP high pressure water jet, and based on heterogeneous crushing mechanism of high pressure water jet, the integrative hydraulic drilling and reaming completely technology is proposed, the system structure of the technology is researched, the main equipments are integrative selected, and the process characteristics and application prospect of the technology are concluded. The results show that the integration technology of the integrative hydraulic drilling and reaming obvious improves the permeability of coal, promotes gas release, realizes continuous drilling between coal and seam and carried out simultaneously with drilling and reaming. It could significantly increase reaming efficiency and adaptability of evil working condition, which has important popularized and applied values.

Pulverization of end-of-life tires by ultra-high pressure water jet process

2017 ◽  
Vol 37 (3) ◽  
pp. 211-225 ◽  
Author(s):  
Zefeng Wang ◽  
Yong Kang ◽  
Zhao Wang
Keyword(s):  
Particle Size ◽  
High Pressure ◽  
End Of Life ◽  
Reduction Process ◽  
Processing Parameters ◽  
Crumb Rubber ◽  
Water Jet ◽  
Ultra High Pressure ◽  
Pressure Water ◽  
High Pressure Water Jet

Abstract Crumb rubber (CR), as a final product from end-of-life tires through size reduction process, has proved an appropriate end product for accumulated discard waste tires all around the world. Unlike pre-existing pulverization methods, such as ambient or cryogenic grinding and solid-state shear extrusion, an entire cool pulverization process utilizing ultra-high pressure water jet (UHPWJ) was proposed in this paper. Pulverization experiments under various processing parameters were designed and conducted. The particle size distributions of produced CR were obtained using laser particle analyzer. Microscopic morphologies of CR and rubber fracture surface were observed under scanning electron microscopy. The crosslink density and gel fraction of produced CR were experimentally determined. Influence of four main processing parameters as pump pressure, transverse velocity, standoff distance and impacting angle was discussed in detail, and the most suitable processing parameters were recommended. The results show that the particle size distribution of produced CR with UHPWJ is between 45 μm and 200 μm, and the surface of CR is coarse and porous. High compressive shear effect and erosion are the main mechanisms in UHPWJ pulverization. Besides, the produced CR has already been partly devulcanized after UHPWJ pulverization, and polymer degradation occurred in the meanwhile.

The mechanism and application of high-pressure water jet technology to prevent compound dynamic disaster

2021 ◽  
Vol 14 (13) ◽  
Author(s):  
Zeng-qiang Yang ◽  
Chang Liu ◽  
Feng-shuo Li ◽  
Lin-ming Dou ◽  
Gang-wei Li ◽  
...  
Keyword(s):  
High Pressure ◽  
Water Jet ◽  
Pressure Water ◽  
Dynamic Disaster ◽  
High Pressure Water Jet

Crowning Carrots with a High Pressure Water Jet

1988 ◽  
Vol 4 (4) ◽  
pp. 340-343 ◽  
Author(s):  
John H. Posselius ◽  
Jr.. Glenn T. Conklin
Keyword(s):  
High Pressure ◽  
Water Jet ◽  
Pressure Water ◽  
High Pressure Water Jet
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