| Segment erector plays an important role in shield tunneling construction.Its main function is to install precast concrete segments on the surface of excavated tunnels.The segmental erector used in large and medium-sized tunnels has achieved certain research results,but it requires more human participation.Segment erector machines used in small diameter tunnels such as municipal construction and oil and gas pipelines are seldom studied.To study the intelligent assembly of large and medium-sized segment assembling machines and the unmanned assembly of small tunnels,this paper designs a ?900 mm segment assembling platform,carries out the performance analysis of the segment erector platform,and provides theoretical basis for the intellectualization and unmanned segment assembling.On the basis of fully understanding the segment assembling machine used in large and medium-sized tunnels,the function and working process of the segment assembling platform are put forward.The structural design of the rotary system,translation system,lifting system and fine-tuning system of the segment assembling platform are completed,and the three-dimensional models of each subsystem and the whole machine are established.Based on vibration theory,the dynamic model of gear engagement system in rotary system of segment erector platform is established,and the mathematical model is simulated by using MATLAB software to study the influence of gear engagement on the accuracy of rotary system of segment erector platform.The dynamic equation of hydraulic cylinder is established and applied to the lifting system of segment erector platform.The dynamic model of the lifting system of the segment erector platform is established to carry out numerical simulation,and the influence of the vibration characteristics of the hydraulic cylinder on the assembly accuracy of the segment erector platform is studied.According to the variation law of the axial stiffness of the ball screw,the vibration model and equation of the translation system of the segment erector platform are established,and the vibration equation is analyzed by numerical simulation.The influence of the axial stiffness of ball screw on the translation system of segment erector platform is investigated.According to the three-dimensional model of the segment erector platform,the dynamic simulation of the segment erector platform is carried out by using multi-body dynamics simulation software Adams.The kinematics behavior of the segment center and the stress at the cylinder and guide column joints are analyzed when the segment erector platform is assembled at different positions.The shunt collector valve is applied to the hydraulic lifting system of the segment erector platform,and the hydraulic lifting system of the segment erector platform is analyzed.According to the structure of shunt collector valve,the model of shunt collector valve is established by using the HCD library(Hydraulic Component Design)of AMESim software.The synchronization characteristics of the hydraulic lifting system of the segment erector platform under different loads are analyzed.The results show that the shunt collector valve is feasible in the segment erector platform lifting system.The mechanical-hydraulic simulation model of the lifting system of the segment erector platform is established,and the synchronization performance of the lifting system is analyzed during the whole working process of the segment erector platform.According to the given schematic diagram,the hydraulic system is built on the hydraulic platform to test the feasibility of the hydraulic lifting system.The results show that the hoisting system of segment erector platform has good synchronization. |
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