Experiment Research On Adhesion-reducing And Resistance-decreasing Properties Of Macroscopic Soil-engaging Surfaces For Bulldozing Plates

Bulldozer is one of the most representative models in engineering machinery, and it's widely used in all kinds of fundamental constructions. Bulldozing plate is the main working part of bulldozer, and large amount of energy can be wasted by overcoming soil resistance when the bulldozing plate moves earth, and meanwhile the soil adhesion on soil-engaging surface can have an adverse influence on the work efficiency of bulldozer. The soil resistance and soil adhesion can be reduced by optimizing the geometric shape of bulldozing plate's macroscopic soil-engaging surface. This paper focused on experimental study of adhesion-reducing and resistance-decreasing properties of bulldozing plate's macroscopic soil-engaging surface, and also explored the principle of different soil-engaging surfaces on the influence of adhesion-reducing and resistance-decreasing properties, and as well discussed the optimal soil-engaging surface on different working types.First of all, the effect was analyzed between soil. and bulldozing plate's soil-engaging surface .According to the change trend line of curvature directrix, the soil-engaging surface can be divided into different types. Theoretical research is discussed for different types of soil-engaging surface on adhesion-reducing and resistance-decreasing properties.Secondly, According to theoretical research and design experience of traditional bulldozer, the unitized design of directrix shape and cutting angle was proceeded for the structure of soil-engaging surface of bulldozer model. Meanwhile, the soil bin and soil bin trolley system required by the experiment was designed, and this system can be used to study the interaction between different farming parts and soil.Finally, the influence of structural parameters and working conditions on adhesion-reducing and resistance-decreasing properties of soil-engaging surface was studied through experiments, and the change principle of resistance on macroscopic soil-engaging surface was studied, what's more, the soil adhesion was also studied.Based on the study of structural parameters, these conclusions can be inferred: regarding to adhesion-reducing and resistance-decreasing properties, the soil-engaging surface of bionic curve was more excellent than that of normal circular curve and parabola; the working resistance of soil-engaging surface of normal circular curve was more easily influenced by cutting angle; when the cutting angle was 60°, the adhesion-reducing and resistance-decreasing properties were less easily influenced by the change of directrix.Different working types of soil-engaging surface on adhesion-reducing and resistance-decreasing properties were studied in this research, and it can be inferred that: when the working type is of changing tilling depths and stabilizing tilling speeds, and the tilling depth was 30mm, the adhesion-reducing and resistance-decreasing properties of normal circular curve and bionic curve bulldozing plate were more excellent; when the tilling depth was 55mm, the adhesion-reducing property of normal circular curve bulldozing plate was more excellent , and the resistance-decreasing property of parabola bulldozing plate was more excellent. When the working type is of changing tilling speeds and stabilizing tilling depths, when the working speed was 0.08m/s, the adhesion-reducing property of normal circular curve bulldozing plate was more excellent and the resistance-decreasing property of parabola bulldozing plate was more excellent; when the working speed was 0.16m/s, the adhesion-reducing and resistance-decreasing properties of normal circular curve bulldozing plate was more excellent.This study provided experimental basis for optimizing bulldozing plate's soil-engaging surface, and it was good for optimizing macroscopic soil-engaging surfaces of farming parts.