Heavy-Duty Pulley Shaft for Rock Drill Jumbos This pulley shaft is engineered to support torque transmission in rock drill jumbo pulley systems, withstanding radial loads, vibration, and abrasive contaminants in mining environments. Its robust design ensures reliable operation in critical lifting and positioning mechanisms, reducing downtime from shaft failure or bearing misalignment.
Technical Specifications & Design
Material & Durability:
Constructed from 42CrMo4 alloy steel, featuring induction-hardened surfaces (3-4mm depth) for HRC50-55 wear resistance and a tough core (HRC30-35) to absorb impact loads. This material achieves 1200MPa tensile strength, suitable for heavy-duty pulley applications .
8μm zinc plating provides 72-hour salt spray resistance (ASTM B117), protecting against corrosion in damp underground mines and extending service life by 35% compared to uncoated shafts .
Precision Engineering:
IT7 dimensional tolerance (ISO 286-1) ensures proper alignment with ISO 15745-1 bearings, minimizing friction and premature wear. The Ra 0.8μm surface finish reduces bearing noise and extends lubricant life in high-vibration environments .
Rated for 6500N·m continuous torque, it handles rotational forces from cable tension in drill arm positioning. The 10⁶ cycle fatigue life (ISO 12044) ensures durability in repetitive lifting operations .
Operating temperature range (-30°C to +100°C) maintains stability in cold mines and high-friction systems .
Applications
Rock Drill Jumbos: Supports pulley systems in drill arm lifting, cable winches, and boom positioning.
Mining Equipment: Compatible with loaders, crushers, and tunneling machines requiring heavy-duty pulley shafts.
Industrial Machinery: Suitable for material handling conveyors and crane systems.
