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推进系统是盾构机的重要组成部分。以应用最为广泛的Φ6.3m土压平衡盾构推进系统为例,提出一种采用液压变压器的新型节能盾构液压推进系统。该系统以液压变压器作为控制元件,4组推进液压缸分别由4个相应的液压变压器控制,系统的动力源由蓄能器和补油泵共同提供。采用液压变压器的推进系统结构简单、能量利用率高,避免了传统阀控系统中存在的严重溢流截流损失。介绍系统的工作原理和设计流程,提出设计步骤和设计方法,通过较精确的计算,确定一种装机功率相对阀控方式较小的盾构推进液压系统。在拥有同样设计推进能力的情况下,与通常的阀控系统相比,液压变压器推进系统可使装机功率降低30%,体现出较大的节能优势。
Propulsion system is an important part of shield machine. Taking the most widely used Φ6.3m EPB shield propulsion system as an example, this paper proposes a new energy-saving shield hydraulic propulsion system using hydraulic transformers. The system uses a hydraulic transformer as a control element, and four sets of propulsion hydraulic cylinders are respectively controlled by four corresponding hydraulic transformers. The power source of the system is provided by an accumulator and a charge pump. The propulsion system with hydraulic transformer is simple in structure and high in energy efficiency, which avoids the serious overflow cutoff loss existing in the traditional valve control system. The working principle and design flow of the system are introduced. The design steps and design methods are put forward. By means of more accurate calculation, a shield-driven hydraulic system with less installed power than the valve control method is determined. With the same design propulsion capability, the hydraulic transformer propulsion system offers a 30% reduction in installed power compared to conventional valve control systems, demonstrating significant energy savings.