Finite Element Analysis And Improvement Research For Chassis Of The Open-air Rotary Drilling Rig

Chassis is the the main bearing component of the open-air rotary drilling rig, it is the basic component that is used to connect the working decive and moving decive. It not ony to install the motor and transmission devices, but also bear a variety of forces and moments in the process of traveling and working, taking the most of load of the open-air rotary drilling rig. So, its performance is directly related to vehicle performance is good or bad. The performance of the chassis depends on the chassis in the static and dynamic response of load, so the static and dynamic response analysis of the chassis can not only evaluate the performance of the chassis itself, but also can serve as a performance evaluation of driving comfort, etc. The results of the analysis of the chassis can also provide theoretical foundation for improving and optimizing the structure of the chassis.According to the requirement of Mines fifth expansion and innovation project of the Yunnan Xiaolongtan Bureau and with the structural features and working conditions of the open-air rotary drilling rig, this article uses the finite element analysis technique to research chassis of the open-air rotary drilling rig as following:This thesis sets up three-dimensional model of chassis of the open-air rotary drilling rig base on Solid Edge software, and than converts it to parasolid format in order to import files into the finite element analysis softwar which is HyperMesh to mesh, set boundary condition, load and other pre-processing, at last it uses OptiStruct solver to calculate and post-processing. This thesis calculates stress and strain amplitude of the open-air rotary drilling rigs in several different conditions. The results show that overall stress of chassis is low and far below allowable stress, but the the deformation of the chassis is large, so there is lack of some rigidity. Combined with modal analysis of chassis at the some time, proposing a improvable scheme based on finite element calculations. The improvable scheme reduces the stress and train amplitude on bolt hole after calculation, and than enhances the rigidity of the chassis. The results show that the scheme is reasonable. After that, using volume of chassis as the objective function to optimize the thickness of components on the chassis. The analysis of calculated results show that the stress and strain of the optimized chassis are able to achieve the permissible safe values, and the dynamic characteristics (mode) of the chassis can be very good to meet the requirements. This is directive and referenced for improving chassis by later.