毕业设计（论文）-多功能挖掘机回转装置设计.doc

本科毕业设计(论文) 题目：挖掘机回转装置设计 全套图纸加153893706  多功能挖掘机回转装置设计 摘 要 目前机械式挖掘机普遍采用滚轮夹套式支承回转装置，这种支承装置，只能传递垂直作用的载荷，传递水平力必须依靠枢轴或反倾覆滚子，并要借助于中央枢轴对准中心。由于滚轮为圆柱形，所以内外端回转半径不同，滚动起来有速度差，使滚轮与滚道间发生滑动，增大了运行阻力，加快了滚轮的磨损；并且维修复杂。为了使挖掘机的结构变得更加紧凑、旋转更快、装配维护更加方便，同时能承受更大的载荷，本文采用了轴承式回转支承装置。这种支承是一种能够承受综合载荷的大型轴承，可以同时承受较大的轴向负荷、径向负荷和倾覆力矩，并使回转机构省去了中央枢轴的新型支承回转装 置。 本文对机械式挖掘机的回转支承结构进行了改造，选择了用轴承式的回转支承来代替滚轮夹套式支承。本论文做了如下工作： (1) 按照回转支承的承载能力和选型原则，提出机械式挖掘机回转支承类型和型号的选择原则。 (2) 提出与回转支承外齿啮合的小齿轮参数的设计原则。 (3) 提出回转支承联接体结构设计和强度分析的方法。 (4) 为了使回转支承滚动体受力均匀，提出挖掘机合理平衡重的确定方法。 关键词：回转支承；载荷分析；齿轮传动；平衡分析；有限元法 Structure Design and Analysis of Slewing Ring of Mechanical Excavator Abstract The slewing rings of roller clampped are adopted by the mechanical excavators.However,this structure can only transfer the vertical load and it need the central pivot or the rollers that avoid to overturn to transfer level load.The excavator aims at the centre by the aid of central pivot. The shape of the rollers is columned, so their slewing radius are different. The glide happens between the roller and the orbit. The glide accelerates the roller’s abrasion and increases the running resistance. Along with the development of excavator’s productivity, the slewing ring bearing come into being. Thisstructure can support the excavators to work without the central pivot. This supporting is one kind of large-scale bearing being able to bear synthetical load .At the same time, it can bear bigger axial load , radial direction load and overturn force moment. It is like a special big roller bearing. Its structure becomes more compact and the assemblage and maintenance become easier. It runs smooth and slews fast. The slewing ring can improve the efficiency of excavator . The purpose of research is to choose an appropriate slewing bearing to replace the roller supporting structure. The main contents inthis paper are described as follows: First, the selection principle of the type and model of the slewing bearing applied to mechanical excavator has been put forw