Study On The Geometry And Mechanical Properties Of Bulldozing Plate Soil Engaging Surface

The bulldozer takes one kind of multipurpose voluntarily-like earthwork machinery, holds the extremely important status in the modernization. Bulldozing plate as the working parts, cutting, crushing, mainly by shovel, and soil etc. While the soil engaging surface as a direct carrier "role" bulldozing plate and soil, often by the adhesion of soil to different extent, resulting in increased resistance, low the production efficiency and reduce the work resistance. Such as the improvement of the bulldozing plate desorption drag reduction performance by optimizing the shape of the contact surface of soil, it will be increase productivity at the same time, achieve energy saving and emission reduction of Engineering machinery. Under the guidance of the ideas above, the energy saving design of bulldozing plate made a further study.The author explores the basic conditions what the bulldozing plate soil engaging surfaces should be satisfied, on this basis, discussed the feasibility of an adjacent structure is applied to the bulldozing plate design of soil engaging surfaces. Then, based on the differential geometry theory of curvature, arc, involute, cycloid, straight line is analyzed. In order to realize the ideal of soil engaging surface curvature properties in the bulldozing plate, according to the different requirements of design, the use of variable substitution method, power series expansion method, the limit of function method in three ways, the line to line curvature equation of reverse engineering, and expounds the theoretical basis of each mode and the scope of application, the bionic type, common type, parabolic arc line is calculated, which proves the feasibility of the proposed theory.Using Solidworks establish cutting angle of 50°, 55°, 60° for circular, involute, cycloid bulldozing plate-cutting soil model, in order to enhance the contrast of the simulation experiment, add a line cutting angle of 75°, the bulldozing plate cutting model. The model built in turn into ANSYS/LS-DYNA, and set the relevant parameters, After the submission of LS-DYNASOLVER computing, based on the simulation results, analysis of six kinds of line form under different conditions of the bulldozing plate contact surface of soil stress strain characteristics and soil macro disturbance characteristics.For further study of soil in four kinds of alignment in the form of working resistance and soil adhesion of soil, alignment is pushing plate arc involute, cycloid, the orthogonal experiment was carried out, in order to enhance the contrast experiments, the linear bulldozing plates separate orthogonal test was carried out. Experimental results show that the line form is an important factor what affect the working resistance of the bulldozing plate, cutting angle on the bulldozing plate resistance has little effect on the line, form board push drag reduction capability of involute, cycloid type, arc, straight bulldozing plate was the worst performance of drag reduction. The overall alignment of the bulldozing plate soil adhesion effect is greater than the cutting angle, the arc of bulldozing plate removal capability of soil is best, The cycloid, involute bulldozes the board next best, straight bulldozing plate desorption ability is the worst. Bulldozes the board for the more direct-viewing observation different directrix form when has the cutting action the soil macroscopic perturbation characteristic, based on the soil trough tests on the soil trough modification, The test result indicated that, the different directrix form, the different angle of cutting bulldoze the board soil perturbation situation respectively differently, there is a certain relationship of soil disturbance and bulldozing plate, the working resistance of soil adhesion.