shield ring

A hydraulic drive system of cutter head in shield tunneling machine was designed, which is open type hydraulic system and controlled in open-ring.

设计了一个盾构掘进机的刀盘驱动液压系统，该系统是开式液压系统，应用电液比例控制技术实现了泵排量实时调节。

Combining with the construction of shield driving out of the tunnel in the section between Qibao Station-Outer ring Station along Line 9 of Shanghai tunnel, the paper introduces in details the construction method of the liquefied nitrogen freezing adopted when water leakage occurs in the driving-out process.

文章结合上海地铁9号线七宝站～外环路站区间隧道盾构出洞的实际情况，详细介绍了盾构出洞过程出现渗漏水时采用液氮垂直冻结处理的施工方法。

Considering the urgent requirement of shield machine to reduce the wear of rolling cutter, research on the friction and wear properties of cutter ring was performed on this paper.

本文以盾构滚刀刀圈为研究对象，针对我国新一代盾构机降低滚刀磨损量的迫切要求，开展了滚刀刀圈摩擦磨损性能的研究。

These bearing are also available in a wide variety of shield, seal and snap-ring arrangements.

这些同时也有各种各样的防御系统, 印章和单元环的安排.