No abstract

The structure of dynamic compaction machine’s chassis is box girder which is welded by steel plate. The strength and stiffness of the chassis directly affect the performance of the machine and the safety of dynamic compaction. According to the mechanical characteristics of a 600t•m dynamic compaction machine, the author analyzed the stress distribution and deformation of the chassis under three kinds of working conditions by finite element method. The results show that the finite element method can effectively reflect the overall state of stress and the characteristics of local stress of the chassis. The structure of chassis has sufficient strength and stiffness. The thickness of some parts of the steel plate can be properly reduced. These results provide basis for the further optimal design of the chassis.

The rubber bushing of screw drilling tool is the weak part of motor in drilling work. It is divided into conventional stator rubber bushing and equal wall thickness rubber bushing. The main material is NBR. With the help of large-scale finite element analysis software ABAQUS, based on the known nonlinear characteristics of rubber materials and the constitutive model of rubber materials, the influence of internal pressure on the rubber bushing of screw drilling tools and the influence of different Poisson's ratio on the rubber bushing of screw drilling tools are obtained. In order to guide the use of the screw drill and the preparation of NBR under relevant conditions..

In this paper, a new component assembly library for mechanical devices is presented. Component modeling is the key technology, and component library is also an important functional module, which is a tool for instruction design in the mechanical devices. Mechanical properties are mentioned. Interactions between the component design process and the component library are realized. This paper covers the details about the implementation of the component library. The process of traditional mechanical design is simplified with the component library. Consequently, the design and development time for mechanical device instructions can be significantly shortened.