| With the rapid expansion of the tunnel construction scale in China,the technical level of tunnel mechanization construction needs to be improved urgently.In order to ensure the stability of the surrounding rock during the excavation of the weak surrounding rock(IV and V-level surrounding rock)by drilling and blasting,a steel arch frame is generally required for the initial support.At present,the domestic steel tunnel arches are generally installed in a manner that is mainly manual and supplemented by simple machinery,In order to promote the mechanized operation of tunnel steel arch installation,this paper takes steel arch installation trolley as the main research object,and carries out analysis and optimization research of working devices,which has important engineering practice significance.The working device of the steel arch frame installation trolley is mainly composed of a telescopic arm,a clamping mechanism,a translation arm and a working platform.Based on the research status at home and abroad,the thesis studies the engineering applicability of the structural design of the working device of the steel arch installation trolley according to the tunnel construction environment and the operation requirements of the steel arch installation in China,and through a variety of modeling and analysis The software analyzes the mechanical characteristics of the trolley working device structure,and finally optimizes this special purpose trolley working device.The main research work carried out in this article is as follows:First,this paper analyzes the tunnel construction environment,initial support construction technology and steel arch installation requirements in China,studies the design requirements of the multi-arm steel arch installation trolley working device suitable for the construction of weak surrounding rock tunnels,and determines The overall design of the working device,and the use of three-dimensional design software Solid Works for structural design and modeling of related parts,in preparation for the simulation analysis of the working device.Secondly,the three-dimensional assembly model of the working device is imported into the multi-body dynamics simulation software ADAMS,and the kinematics and dynamics analysis of the working device is performed.Kinematics analysis of the self-leveling deviation of the working platform of the steel arch installation trolley and interference problems of multiarm work,study of the working space and kinematic characteristics of the multi-arm working device;dynamic analysis of the hinge points and hydraulic pressure The force situation of the cylinder provides the necessary parameters for the subsequent finite element force analysis.Thirdly,the finite element mechanical analysis software is used to analyze the structural statics of the key parts of the trolley working device.According to the force parameters obtained by the dynamic simulation,the strength and rigidity of each component under two dangerous working conditions are analyzed;the dynamic characteristics of the telescopic arm are studied,and the modal analysis is carried out to obtain the first 6 levels of the telescopic arm.With the natural frequency and vibration mode,it is analyzed whether the resonance problem will occur in the working device.Finally,using the Design Exploration module in ANSYS Workbench to carry out lightweight optimization research on the telescopic arm.The optimal section parameters are determined by optimizing the section size of the telescopic arm,and the rationality of the optimization study is determined through analysis and verification. |
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