亚洲一区欧美在线,日韩欧美视频免费观看,色戒的三场床戏分别是在几段,欧美日韩国产在线人成

The power consumed by bulldozer’s main working parts—bulldozer blade accounts for about 40% of the total power of the bulldozer in working process. It has great significance to optimize the structure and working methods of bulldozer blade’s macroscopic soilengaging surface, thus decreasing working resistance and increasing energy efficiency. Combined with the classic design theories and research achievements of bulldozer blades, the modular design of directrix form and cutting angle shall be conducted for macroscopic soilengaging surfaces structure of bulldozer blades. Nine bulldozer blade models with the cutting angles of 50°, 55° and 60°, respectively, whose soilengaging surface directrix consists of arc, parabolic and bionic curve respectively, were fabricated and designed with scale model. The resistance features of nine bulldozer blades were studied through indoor soil bin and orthogonal experiment model. The result shows that the interaction between directrix form and cutting angle, and the directrix form has great influence on working resistance with significance level of 0.25. Compared with the traditional circular arc surface bulldozing plate, the paraboloid can relatively reduce the horizontal working resistance by 4.6%, the bionic surface reduced by 16.0%. The vertical resistance is reduced by 4.8% and 51.4%, respectively. The research result has important reference value for the highefficient and energysaving design of bulldozer blades and wide tine soil cutting components related.