Replaceable Rolling Cutter Reamer for Hard Rock Drilling
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Solution Overview
Problem
Reamers used in underground drilling operations, particularly in hard rock formations, experience significant wear and are prone to inefficiency due to the lack of effective tools for enlarging boreholes with minimal surface disruption and reduced wear on equipment.
Innovation Solution
A reamer assembly featuring a body with a pocket configuration, a rolling cutter that rotates without roller bearings, and a pressure compensation system, allowing for the enlargement of boreholes by pulling the reamer back through the borehole while rotating, with replaceable cutters to accommodate varying diameters and wear protection inserts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional reamers are used in hard rock formations, then the borehole can be enlarged, but the equipment experiences significant wear and inefficiency
Solution Approach 1:
The reamer is divided into modular components including multiple arms that can be independently adjusted, and replaceable rolling cutters that can be individually swapped. This segmentation allows wear-resistant components to be replaced without discarding the entire reamer, improving reliability while maintaining productivity through component reuse.
Solution Approach 2:
The reamer allows changing operational parameters by replacing rolling cutters of different sizes and configurations on the same arm structure. This enables adaptation to varying rock hardness and borehole size requirements, improving both wear resistance through selective cutter material and enlarging efficiency through optimized cutter geometry.
2Adaptability or versatility
If the reamer body is designed to accommodate different sized cutters, then versatility is improved, but device complexity increases
Solution Approach 1:
The reamer body is designed with universal pocket configurations that can accommodate rolling cutters of multiple sizes through standardized mounting interfaces. The arms feature adjustable positioning mechanisms that work with various cutter diameters, allowing one reamer body to perform multiple functions across different borehole enlargement requirements without proportionally increasing complexity.
Solution Approach 2:
The design nests multiple cutter size options within a single reamer body structure. Smaller cutters can be mounted on the same arms that can accommodate larger cutters, with the pocket system providing a hierarchical accommodation structure that reduces overall device complexity compared to having separate reamers for each cutter size.
3Device complexity
If rolling cutters rotate without roller bearings, then device complexity is reduced, but friction and wear increase
Solution Approach 1:
The design extracts the roller bearing component from the cutter rotation system, allowing the rolling cutters to rotate directly on their spindles without intermediate bearing elements. This simplification reduces device complexity while the cutter rotation durability is maintained through optimized spindle-cutter interface design and material selection that compensates for the absence of roller bearings.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively enlarges boreholes with reduced wear on equipment, enabling efficient underground utility installations with minimal surface disruption and allowing for the use of the same reamer body with different-sized cutters, thus enhancing operational efficiency and cost-effectiveness.
Implementation Method 1
The rolling cutter rotates about the spindle without the use of roller bearings
Implementation Method 2
The rolling cutter is held between the arm and the retainer within the cutter section of the pocket
Implementation Method 3
a pressure compensation system disposed within the arm
Implementation Method 4
a grease passage and a pressure compensation system disposed within the arm
Data Source
AI summary
A reamer for use in underground drilling back-reaming operations. The reamer comprises a body comprising a plurality of pockets. The pockets are configured such that an arm, a rolling cutter, and a retainer may fit within each of the pockets. Each of the rolling cutters is connected to each of the arms via a spindle. The rolling cutters are held on the spindle and connected to each of the pockets via a retainer. Each of the arms are secured to each of the pockets via a plurality of fasteners. A mechanical lock is used to secure at least one of the fasteners in place. Each of the arms comprise a grease passage and a pressure compensation system. The rolling cutters are replaceable with rolling cutters of like size or rolling cutters of different sizes and shapes.