| With the increasing scale of China's infrastructure construction,the amount of tunnel construction work increases rapidly.At present,in order to prevent the surrounding rock from sliding and collapsing in the process of tunnel excavation,the steel arch frame is mainly used as an important component of the initial support in the process of tunnel excavation.The installation of arch frame is usually completed by manual operation of auxiliary platform carrying workers,which has poor safety,low working efficiency and high working intensity.In addition,with the increase of labor cost and the expansion of construction scale,the mechanized construction of tunnel support has become an inevitable development trend.Therefore,the research and development of the working mechanism of arch frame installation equipment is not only an urgent need for the mechanized construction of tunnel,but also an urgent practical application problem.Combining with the enterprise actual engineering problems,study of the proposed scheme was mainly carried out the following work:(1)Through the investigation and analysis of the current domestic and foreign tunnel arch installation technology and equipment,combined with the improvement suggestions put forward by the enterprise in the actual operation,this paper determined the new structural design scheme of the working mechanism of the arch installation trolley,improved and optimized the expansion structure of the working mechanism of the arch installation trolley,and determines the specific design parameters.According to the design parameters,the structural design and 3D modeling of the concrete parts of the arch installation trolley working mechanism were carried out.(2)According to the D-H method,the kinematics equation of the working mechanism of the arch installation trolley was derived,and the specific working space range was defined by solving the equation with MATLAB;and the spatial three-dimensional motion simulation of the whole working mechanism was carried out to check whether there was interference in the whole movement,and the kinematic parameters of the mechanism's key parts were obtained.(3)ADAMS software was used to study the dynamics of the whole working mechanism,analyzed the force state of each joint and actuating cylinder under different work orders,and the actual attitude of the working mechanism in the limit working condition was guessed and verified,obtained the dynamic parameters of joints and active cylinders under the limit condition,hydraulic cylinder type selection design is verified and the finite element analysis for further provides the necessary parameters,the selection design of hydraulic cylinder was verified and the necessary parameters were provided for further finite element analysis.(4)The finite element analysis model of the whole working mechanism was established by ANSYS-Workbench,and the stress state of the mechanism under the limit working condition was simulated.The low-order vibration mode of the whole mechanism was further analyzed,and the specific vibration frequency and deformation mode were obtained,which provided a theoretical basis for the structure to avoid vibration.This study provides a specific case for the working mechanism of the arch installation trolley,provides a theoretical reference for the design and optimization of the relevant mechanism structure,and has a certain guiding significance for the production and manufacturing of the relevant structures. |
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