抛物线型推土板几何特性与工作阻力特性研究

Study on geometrical properties and working resistance characteristics of parabolic bulldozing plate

以抛物线为触土曲面准线形式,切削角分别为50°、55°和60°,设计与制作了3种模型推土板。通过室内土槽试验测试了3种推土板的工作阻力,切削角为55°的推土板工作阻力最小。在此基础上,建立了3种抛物线准线形式推土板的宏观触土曲面参数方程,并完成了3种触土曲面第一类基本量E、F和G,第二类基本量L、M和N等内蕴几何量的计算。发现第一类基本量中的E值和第二类基本量中的L值存在一个较优的取值范围,可使触土曲面获得较低工作阻力。研究结果为推土板宏观触土曲面的减阻设计提供了参考。

Three forms of model parabolic bulldozing plate were designed and manufactured. Their macroscopic soil-engaging surface directrixes consisted of parabolic curve, and the cutting angle was 50°, 55°and 60°respectively. Their working resistance was tested in a homemade indoor soil bin. The parabolic bulldozing plate model with the cutting angle of 55°had the least working resistance. On this basis, the parametric equations of three kinds of bulldozing plates whose macroscopic soil-engaging surfaces were various parabolic directrixes were established, and the intrinsic geometrical quantities of the soil-engaging surface, including the fi rst base quantity E, F and G and the second base quantity L, M and N, were calculated. It was found that there was an optimal value range of the fi rst base quantity E and the second base quantity L, in which the soil-engaging surface obtained lower working resistance. The research results offered references for the resistance-reducing design of macroscopic soil-engaging surface of the bulldozing plate.