异形断面盾构切削机构分析

开发合理的切削机构是异形断面盾构的关键技术之一 .提出一种三杆切削机构 ,它在原有圆形盾构刀盘上加装可控制的伸缩机构 ,完成任意断面的切削 ,结构简单实用 .介绍了异形断面盾构切削机构的控制方式 ,分析了阀控液压缸和滑阀计量马达两种控制方式 ,前者结构简单 ,控制容易 ,但需要一个较长的位移传感器 ,而且信号需通过滑环传递 ,难以保证信号准确性 .后者可以保证得到精确的信号 ,但其液压系统的泄漏会影响精度 ,需要采取补偿措施 .最后对三杆机构的伸缩速度进行了分析 ,由此可确定控制机构的马达、油缸等参数 ,以便进行正确的选型 ,为异形断面盾构机械提供设计依据 .

Analysis of Cutting Mechanism of Special Section Shield

Developing optimum cutting mechanism is a key technology for the design of special-section shield.This paper brings forward a new cutting mode,three-bar mechanism,in which a kind of controllable telescopic equipment is added on the original circular-section shield.It can cut any kind of section.It has very simple structure but is very practicable.The control method of the special-section shield is also analyzed in this paper.The valve control cylinder mode and the slide valve with metering motor mode are compared.The former one can be controlled rather easily,but a long distance sensor is needed and signal should be transferred through a sliding ring.So,it is difficult to get precise signals.The latter one can insure precision of signals,but leakage of hydraulic system will affect the precision of the whole system.So,compensation measures should be taken for this mode.Moreover,this paper analyzes the velocity of telescopic mechanism,which provides design bases for choosing motor and hydraulic cylinder.