| The friction,wear and lubrication performance between the internal friction surfaces of mining high water-based axial piston pump has a very important impact on its performance,efficiency and service life.With the development of high water base hydraulic system in mining area towards high pressure and large flow,how to improve the lubrication performance of axial piston pump in mining area and reduce the friction loss between clearance fit surfaces has become a scientific and technical problem to be solved urgently.In this paper,taking a type of high water base axial piston pump for mining as the research object,combining with the current method to improve the lubrication performance of hydraulic components,from the introduction of surface texture and change of friction pair matching materials to improve the lubrication performance of high water-base axial piston pump.Among them,the hydrodynamic lubrication performance and wear reduction mechanism of spherical hinge pair with surface texture were studied by combining theoretical analysis and Fluent dynamic simulation;Based on the load,working frequency,medium concentration and other working parameters of high water-base axial piston pump,the tribological properties and wear mechanism of ceramic/steel coupling were investigated by using multi-functional friction and wear testing machine and scanning electron microscope.And then,the regulation method of lubrication performance of friction pair of high water-base axial piston pump for mining is obtained,which provides a technical scheme for improving its lubrication performance,reducing its friction loss and maintenance cost.Firstly,by analyzing the working principle,motion,force and high water-based emulsion of mining high water-based axial piston pump,the factors affecting the lubrication performance of mining high water-based piston pump are summarized and summarized for its practical application conditions,focusing on the regulation methods of each influencing factor and proposing specific technical solutions for the regulation of key influencing factors,including the selection of surface weave and the selection of friction pairing materials.Secondly,by constructing a simulation model with surface weave ball hinge,Fluent numerical simulation is used to analyze the wear mechanism and load-bearing characteristics of ball hinge with different surface weave,combined with orthogonal test to analyze the influence law of film thickness,rotational speed,high water-based emulsion concentration,pit shape,depth-diameter ratio and area ratio on the load-bearing characteristics and lubrication performance of oil film and seek the optimal combination.The results show that under certain speed and high water-based emulsion concentration,the load carrying capacity of different shapes of pits from large to small is cylindrical pit > conical pit > spherical pit;the optimal horizontal combination is film thickness 4.5μm,speed 1500r/min,high water-based emulsion concentration 3%,cylindrical pit shape,depth to diameter ratio 0.1,area ratio 10%;and the friction coefficient with pits is smaller than that without pits through the test The difference is about 0.02 and the reduction of friction coefficient is mainly due to the storage of high water-based emulsion in the pit,which verifies the correctness of the numerical simulation.Finally,304 stainless steel and zirconia ceramics were selected as the mating materials of the friction pair,and the friction coefficient,wear rate,wear mechanism,surface morphology and its anti-wear and friction reduction properties were analyzed under the parameters of load,frequency,and high water-based emulsion concentration.The following conclusions were obtained:the friction coefficient of ceramic-steel mating is significantly smaller than that of steel-steel mating;the friction coefficient of ceramic/steel-steel mating is mainly influenced by the concentration and load,but less by the frequency.Under the condition of 100 N load and 1Hz frequency,the friction coefficient of ceramic/steel mating is at the minimum value at 6% concentration,while the friction coefficient of steel/steel mating is at the minimum value at 8%concentration.The wear of ceramic/steel-steel pairing is mainly abrasive and plowing wear,and the wear increases with increasing concentration;while the abrasive and plowing wear decreases with increasing load and frequency.Therefore,the ceramic/steel pairing improves its lubrication performance and reduces wear.Combined with mining high water-based axial piston pump operating conditions,the weaving morphology of its internal spool surface and the mechanism of different materials on its tribological characteristics were investigated,and the technical solutions for the regulation of lubrication performance of mining high water-based axial piston pumps were proposed.The above research helps to promote the development of high pressure and high flow rate mining high water-based hydraulic technology,and provides design parameter for research of lubrication performance of high water-based axial piston pumps in other fields. |
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