Microtunneling Drill Head With Venturi Swarf Extraction
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Solution Overview
Problem
Existing microtunneling technologies face challenges in maintaining a straight bore due to uneven ground conditions and swarf extraction issues, particularly in nonconsolidated or fluid ground, leading to blockages and difficulty in achieving precise bore alignment.
Innovation Solution
A drill head with a cutter bar, air and exhaust cavities, and a pressure adjustment mechanism using a venturi flow to manage swarf extraction, combined with articulation and steering capabilities through adjustable articulation and shell rams, allowing for remote operation and enhanced control of the drilling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If steerable drill heads are used to navigate non-homogeneous ground conditions, then the drill head can adapt to varying ground resistance, but the ability to produce a straight bore is compromised due to steering at the tip
Solution Approach 1:
The patent replaces the mechanical steering mechanism at the drill head tip with a pneumatic control system. By substituting the mechanical steering approach with air pressure differential control, the system achieves bore straightness while maintaining adaptability to ground conditions through remote pneumatic adjustment rather than tip steering.
Solution Approach 2:
The patent introduces air pressure as an intermediary mechanism between the operator and the drill head steering. Instead of direct mechanical steering at the tip, air pressure differentials are used to subtly adjust the drill head orientation, enabling precise control for straight bore production while adapting to varying ground resistance.
2Productivity
If swarf extraction is increased in nonconsolidated or fluid ground, then more swarf can be removed from the working zone, but the uneven collapse of the working face occurs making it difficult to achieve a straight bore
Solution Approach 1:
The patent employs dynamic air pressure adjustment to control swarf extraction. Rather than fixed extraction rates, the system dynamically modulates air pressure to match ground conditions, enabling efficient swarf removal while maintaining working face stability and bore straightness in nonconsolidated or fluid ground.
Solution Approach 2:
The patent changes the physical parameter of air pressure to control swarf extraction characteristics. By adjusting air pressure parameters, the system optimizes swarf removal efficiency while preventing working face collapse, thereby maintaining bore straightness in challenging ground conditions.
3Productivity
If the cutter bar processes swarf from the working face, then cutting efficiency is maintained, but excess swarf blocks access to the exhaust conduit
Solution Approach 1:
The patent uses pneumatic principles to create a controlled air flow environment that manages swarf movement. The pneumatic system directs air flow to prevent swarf accumulation around the exhaust conduit while maintaining cutting efficiency, solving the blockage problem without reducing productivity.
Solution Approach 2:
The patent introduces air flow as an intermediary between the cutter bar and exhaust conduit. This air flow mediator prevents excess swarf from blocking the exhaust conduit access while allowing the cutter bar to continue processing swarf efficiently at the working face.
4Productivity
If air pressure in the working zone is increased to improve swarf extraction, then swarf removal efficiency increases, but the risk of working face collapse increases in nonconsolidated ground
Solution Approach 1:
The patent employs dynamic air pressure control that adapts to ground conditions. The system dynamically adjusts air pressure levels to maximize swarf removal efficiency while maintaining working face stability in nonconsolidated ground, preventing both blockages and collapses through real-time pressure modulation.
Solution Approach 2:
The patent utilizes parameter changes in air pressure to optimize the balance between swarf extraction and working face stability. By carefully controlling air pressure parameters, the system achieves efficient swarf removal while preventing working face collapse in nonconsolidated or fluid ground conditions.
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 enables efficient swarf extraction and maintains bore alignment, even in challenging ground conditions, by adjusting air pressure and articulation to ensure a straight bore is produced, enhancing operational efficiency and precision.
Implementation Method 1
A venturi flow is created between the air aperture and the exhaust aperture to generate negative pressure in the working zone
Data Source
AI summary
This invention relates to a drill head for the use with a microtunneling apparatus (1) for producing a substantially horizontal bore hole (8). The drill head (4) includes a cutter bar (12) that is rotatable within a working zone (13) of the bore (8) which produces swarf which can be extracted from the working zone (13). The drill head (4) includes a pressure adjustment mechanism including a throat member (49) which is adjustable at the distal end of the drill head (4) to adjust the extraction of swarf from the working zone (13).