Low Profile Cable Bolt Head for Mine Roof Safety
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Solution Overview
Problem
Conventional roof cable bolts protrude significantly from the mine roof, creating hazards and adding complexity and cost to the installation process, especially in coal seams with low clearances.
Innovation Solution
A low profile roof cable bolt head design with a first section for insertion into the roof hole and a second section for accommodating a tightening tool, featuring a throughhole that extends through both sections, allowing the bolt to fit entirely within the hole and reducing protrusion, thus minimizing hazards and installation complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional cable bolt head is used, then the bolt can be easily installed and tightened, but the head protrudes 2-3 inches from the roof creating safety hazards and reducing clearance
Solution Approach 1:
The cable bolt head is segmented into two distinct sections: a first section that fits inside the drilled hole and a second section that protrudes from the roof. This segmentation allows the bulk of the head to be hidden within the roof while maintaining the necessary tightening interface, thereby reducing the protrusion hazard while preserving ease of operation.
Solution Approach 2:
The invention transitions from a conventional single-piece head design to a two-section design where the first section is positioned in a different spatial dimension (inside the hole) compared to the second section (protruding from the roof). This dimensional redistribution reduces the hazardous protrusion while maintaining functionality.
2Object-affected harmful factors
If an inverted dome crater plate system is used, then protrusion is reduced, but the installation process becomes more complex and costly
Solution Approach 1:
The invention merges the crater plate function and the cable bolt head function into a single integrated two-section head component. This eliminates the need for separate crater plate installation steps and dedicated crater hole formation processes, thereby reducing installation complexity and cost while maintaining protrusion reduction benefits.
Solution Approach 2:
The two-section head serves multiple functions: the first section provides the low-profile insertion component that reduces protrusion, while the second section provides the tightening interface. This multi-functionality eliminates the need for separate crater plate and head components, simplifying the overall system and installation process.
Data Source
AI summary
Improved roof cable bolts with reduced protrusion from a mine roof. Particularly, a roof cable bolt head can preferably be dimensioned such that most of its length fits inside a drilled hole in the mine roof.