Permanent Derrick

The inclined-leg permanent headframe is a critical facility in modern mine hoisting systems, specifically designed for ground-mounted multi-rope friction hoists and drum winding systems. Featuring a large-span inclined-leg structure, it combines structural simplicity, rational load distribution, and efficient construction, significantly reducing building costs while enhancing operational reliability. After shaft completion, the temporary sinking headframe must be converted into a permanent headframe to meet the long-term production needs of the mine. The vertical shaft multi-rope friction hoist headframe is a representative structure of this type, widely used for hoisting operations in various vertical shafts and responsible for transporting coal, ore, personnel, and materials.

Structural Features and Working Principle:

The headframe employs a modular steel structure design connected by high-strength bolts, facilitating rapid on-site assembly. Its core structural feature lies in the optimized load transfer path: all hoisting loads are transmitted through the sheave platform to the inclined-leg main truss and then transferred to the foundation via the base system. The inclined-leg design enables the main structure to efficiently bear the long-term dynamic loads of the permanent hoisting system under full-load operation, including the significant working tension of multi-rope friction hoists and the impact loads from frequent starts and stops, while maintaining excellent wind and seismic resistance stability.