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| Design and simulation analysis of gripper and thrust hydraulic system for TBM test rig |
| ZHANG Zhen， GONG Guo-fang， RAO Yun-yi， WU Wei-qiang， LIU Tong |
| State Key Lab of Fluid Power Transmission and Control， Zhejiang University， Hangzhou 310027， China |
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Abstract A gripper and thrust hydraulic system was proposed based on the Hard Rock Tunnel Boring Machine (TBM) test rig to overcome the problem of high impact in the gripper system and pressure oscillation in the thrust system. Models of hydraulic system in AMESim were established. Pressure response of thrust system under random load was analyzed. The response of gripper system was compared under different diameters of orifice and back pressure values. The results indicated that the thrust system had accurate pressure control, and when the orifice diameter decreased from 3 to 1 mm the output force of piston rod in gripper system did not changed, the system shock mitigated, and the response time increased. Also, with the increasing of back pressure, output force reduced, speed of gripper stabilized and had little influence on pressure response. A system with low impact, stable speed and short response time was obtained when the orifice diameter was 1.5 mm and back pressure value was 7 MPa. The designed hydraulic system can damp the impact, obtain stable speed and shorten response time in gripper system, and realize accurate control of pressure in thrust system.
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Received: 16 March 2015
Published: 28 August 2015
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TBM试验台支撑推进液压系统设计与仿真分析
针对全断面硬岩隧道掘进机（TBM）存在推进系统压力控制不精准、支撑系统高压撑紧时冲击剧烈的问题，在直径2.5 m TBM试验台上设计了支撑推进液压系统.在AMESim中搭建了系统模型，仿真分析了推进系统在随机负载下的压力响应及支撑系统中关键部件在不同设置参数下的系统响应.结果表明：推进系统压力控制精准，支撑系统中节流口直径在1~3 mm内减小时，油缸稳态输出力无变化，系统冲击减缓，响应时间随之增加；背压阀压力增大时，油缸稳态输出力减小，撑靴速度更稳定，对系统压力响应影响小.节流口直径为1.5 mm、背压阀压力为7 MPa时，冲击平缓，撑靴运动速度稳定，系统同时获得较快的响应速度.所设计液压系统可实现支撑系统响应速度较快、撑靴速度稳定、冲击平缓和推进系统压力控制准确.
关键词：
TBM,
支撑推进液压系统,
压力控制,
系统冲击,
节流口,
背压,
AMESim仿真
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