| Full face tunnel boring machine is kind of advanced construction high-tech equipment specialized in large-scale tunnel projects.Full-face tunnel boring machine is designed for digging an underground tunnel construction works of large high-tech equipment,it has a safe, reliable,high degree of mechanization,work environment,and earthwork less,progress rapidly,and low construction costs,the core of the current technology in the hands of Europe and the United States and Japan and other developed countries,our country is still in its infancy.However,with the pace of China's infrastructure,such as acceleration,as well as South-North Water Diversion projects.Full-face tunnel boring machine operation,including excavation of the construction, promote,support slagging and lining 4 of the lining operation is one of the key operations,the purpose of rock under pressure,water pressure,such as load,to ensure that the design of tunnel excavation headroom dimensions.Segment assembled full-face tunneling machine is an important component of the machine,set the machinery,hydraulic,electronic control,such as technology and integrated multi-disciplinary,it is mainly used for lining the tunnel crawl and support segment of the mechanical hand,through the crawl,promotion,rotation,translation and fine-tuning a number of actions to complete lining segment,safe and effective assembled into Central and effective start to prevent the infiltration and surface subsidence,and to provide thrust boring.In this paper,combined with recent years,the state of the underground works of infrastructure projects urgently needed at the national'863 'project,"full-face tunnel boring machine test-bed" support,for full-face tunnel boring machine used for lining the tunnel wall The main components - assembled machine segment carried out a detailed analysis.This study is divided into the following areas:1.Tube machine assembled an overview of the structure and hydraulic system performance Segment of the installation requires the completion of segment assembly machine multi-dimensional movement in space,assembled machine segment the main action consists of three main movements:circumferential rotary movement,the vertical lifting movement,the horizontal translational motion,as well as three fine-tuning movement:rolling,pitch, deflection.Analysis of the assembly segment of the hydraulic machine working principle of hydraulic system components in the calculation and selection of the design and completion of a detailed analysis of the above action of the characteristics of the hydraulic circuit.2.The main hydraulic components modeling Segment of the hydraulic system assembly modeling studies,respectively,constitute the establishment of the main components - hydraulic pumps,hydraulic motors,the ratio of the direction of the flow valve,the load,as well as the mathematical model of hydraulic cylinders.3.Hydraulic pump and the rotary-week-Loop SimulationAMEsim this chapter the use of simulation software to establish a system of variable main hydraulic pump components,as well as axial rotation of the model system,calculated through the simulation and comparison,to verify the correctness of the simulation model.Based on this research segment of the assembled machine in the weeks to turn to do the changes when the load on the system dynamic characteristics of the system in balance valve on the system stability.Obtained through simulation,the system will have a stop beyond the load,the motor will have a negative pressure,resulting in system instability,but because the system designed to increase the balance valve effective solution of the problem beyond the load,in spite of open fluctuations will be generated,due to short duration,can be neglected.4.Two-way synchronization control cylinder model simulationSynchronous hydraulic lifting cylinder in accordance with the work,analysis of the synchronous control of the main ways,by comparing the simulation did not use synchronous control and simultaneous control of the use of two kinds of cases that the simulation results and analysis of the existing synchronous control strategy,master-slave synchronization control can achieve better system of hydraulic lifting platform synchronized movements,precision hydraulic cylinder can be controlled simultaneously.. |
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