Simulation Research On Hydraulic System Of Extra-High Pressure Water Jet Equipment

High pressure water jet technology is new technology which has been developing during past30 years. It has been applied to many departments and fields, such as coal, petroleum, metallurgyindustry, aviation, traffic, chemical industry, construction trade, municipal engineering. Highpressure water jet can be used to clean or cut something. Due to the features of high efficiency,energy saving, environmental protection and maneuvering, high-pressure water jet technology isused more and more extensively in various industrial segments and attracts more attention. Highpressure water jet equipment is the generating device of high pressure water jet, and its overallperformance will directly affect the application and popularization of high pressure water jettechnology. Our country has acquired many achievements on the research of correlative technologyof high pressure water jet equipment, and lots of domestic companies manufacture it, but there is abig gap between our country and overseas product upon whole performance. Therefore it isnecessary and meaningful to research how to improve the whole performance of high pressurewater jet equipment.This paper takes the ultra-high pressure water jet equipment manufactured by a company asresearch object. In order to solve the problems of the biggish pressure fluctuation of water jetsystem, the low running efficiency of intensifier, the high oil temperature of hydraulic system, thesimulation research on the hydraulic system of ultra-high pressure water jet equipment is done.Theoretical basis and practicable program are provided to improve the overall performance ofultra-high pressure water jet equipment. Firstly, the relational theory of the hydraulic system ofultra-high pressure water jet equipment is analyzed. Secondly, the pressure fluctuation of water jetsystem is researched. And the effect of delay time of piston movement on the pressure fluctuation ofwater jet system is analyzed in detail. Thirdly, the output mechanism of intensifier is researched.The output characteristic of intensifier and the effect of intensifier's physical parameters on itsrunning efficiency are analyzed. Lastly, the simulation calculation of oil temperature in hydraulicsystem is done to optimize the design of cooling facility and research the relationship betweendifferent parameters and the change of oil temperature in hydraulic system.This paper mainly adopts the methods of theoretical analysis and simulation analysis toresearch the problems which exist in the hydraulic system of ultra-high pressure water jetequipment. The mathematical model of double intensifiers water jet system, the kinematics modelof intensifier and the thermal analysis model of hydraulic system are built by theoretical analysis. Based on MATLAB software, the pressure simulation analysis of double intensifiers water jetsystem, the numerical analysis of kinematics differential equations of intensifier and the simulationcalculation of oil temperature in hydraulic system are done.The results of study show that delay time obviously affects the pressure fluctuation of doubleintensifiers water jet system. And when the other influence factors hold the line, there is the bestdelay time value which causes the minimum pressure fluctuation of water jet system. The influencefactors of intensifier's running efficiency mainly are damping coefficient, the volume of highpressure pipeline between intensifier and holding valve, reversal time, return pressure of water jetsystem, etc. When the hydraulic system of ultra-high pressure water jet equipment lies in twodifferent functional modes, the refrigerating output of cooling facility used in the hydraulic systemis very different. The useful volume of oil tank and ambient temperature obviously affect the oiltemperature of hydraulic system.