Heavy-Duty Pin Assembly for Rock Drill Jumbos This pin assembly is engineered to connect and secure moving components in rock drill jumbo systems, delivering reliable torque transmission and load-bearing performance in harsh mining environments. Its integrated design combines high-strength pins, sealed bearings, and corrosion-resistant coatings to minimize maintenance and maximize equipment uptime.
Technical Specifications & Design
Material & Durability:
Constructed from 42CrMo4 alloy steel, with induction-hardened pin 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 pivot 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 assemblies .
Precision & Integration:
IT7 dimensional tolerance (ISO 286-1) ensures alignment between pins and bushings, reducing friction and vibration in pivot joints. Sealed ball bearings (IP67 rated) prevent contamination by dust and debris, maintaining smooth operation in abrasive conditions .
ISO 8752 compatible mounting holes enable seamless integration with standard rock drill jumbo frames, simplifying installation and replacement .
Performance Under Load:
Rated for 7000N·m continuous torque, it handles the rotational forces generated during drill arm movement and equipment articulation. The 10⁶ cycle fatigue life (ISO 12044) ensures durability in repetitive motion applications .
Operating temperature range (-30°C to +100°C) maintains performance stability in both cold underground mines and high-friction mechanical systems .
Applications
Rock Drill Jumbos: Secures pivot joints in drill arms, boom extensions, and hydraulic cylinder mounts.
Mining Equipment: Compatible with loaders, crushers, and tunneling machines requiring heavy-duty articulated connections.
Industrial Machinery: Suitable for material handling systems, conveyor pivots, and heavy-duty linkages.
