Overview
Shield machine grease is a critical consumable in mechanized tunneling, designed to withstand the abrasive and high-load conditions of tunnel boring machines (TBMs). Unlike standard lubricants, it combines sealing and lubricating functions to protect key components like cutterheads and screw conveyors from soil particles and moisture ingress. Developed for EP (extreme pressure) and water-washing resistance, it ensures uninterrupted operation in diverse geological conditions, from soft clay to hard rock. Major manufacturers include Klüber, Shell, and specialized Chinese brands like Sinopec.
Structure and Working Principle
The grease typically consists of a lithium or synthetic base oil thickened with soap and fortified with solid lubricants (e.g., MoS2 or graphite). These additives form a protective film on metal surfaces, reducing direct contact between moving parts. When applied, the grease fills gaps in the shield machine’s sealing systems, creating a barrier against external debris. Its thixotropic properties allow it to stay in place under vibration while maintaining pumpability during automated injection.
Key Features
High adhesion ensures the grease remains effective even under continuous water exposure, a common challenge in underwater or wet-ground tunneling. Its EP properties prevent wear during sudden load changes, such as when the TBM encounters rock fractures. Temperature stability is another critical feature, with performance maintained across a range of -20°C to 120°C. Some advanced formulations include biodegradable options for environmentally sensitive projects.
Application Areas
Primarily used in large-diameter TBMs for metro, railway, and utility tunnels, the grease is applied via centralized lubrication systems or manual injection. It’s also adapted for slurry and EPB (earth pressure balance) shield machines, where sealing efficiency directly impacts operational safety. Beyond tunneling, similar greases are used in heavy mining equipment and submerged bearings, though formulations may vary to address specific soil chemistries (e.g., high salinity or acidity).
Maintenance and Precautions
Regular inspection of grease distribution systems is essential to avoid dry-running of components. Contaminated or hardened grease should be flushed out promptly to prevent clogging. Storage conditions matter: Keep containers sealed and away from direct sunlight to prevent oxidation. For projects in cold regions, pre-warming the grease may be necessary to ensure smooth pumping.
B2B Procurement Guide
Procure grease in bulk (typically 170kg drums or IBC totes) to reduce costs. Verify supplier certifications like ISO 9001 and test reports for penetration, corrosion resistance (ASTM D1743), and water washout (ASTM D1264). Consider project-specific needs: For example, greases with higher NLGI grades suit warmer climates, while biodegradable options may be required for ecologically regulated zones. Negotiate long-term contracts with suppliers for large-scale projects to stabilize pricing.
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