Extendable Pilot Bit for Barrel Cutter Drilling
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Solution Overview
Problem
Existing core barrels with pilot bits require time-consuming and labor-intensive processes to remove and store the pilot bit during drilling, especially when transitioning from initial to later stages of hole boring, due to the need for skilled personnel and storage space.
Innovation Solution
A core barrel system with an extendable pilot bit that couples directly to an auger on a digger derrick, allowing the pilot bit to translate within the core barrel, enabling uninterrupted drilling and reducing configuration time by using a unified multi-cutting edge replaceable bit head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a core barrel with a fixed pilot bit is used, then the pilot bit can guide the core barrel during initial drilling, but the pilot bit must be removed and stored during later drilling stages, causing time loss and requiring additional personnel and storage space
Solution Approach 1:
The patent applies the dynamics principle by making the pilot bit extendable rather than fixed. The pilot bit can be extended when needed for guidance during initial drilling stages and retracted when no longer needed for later stages, allowing the system to adapt dynamically to different operational requirements without removal or storage
Solution Approach 2:
The patent applies the nesting principle by placing the pilot bit inside the core barrel when retracted. The pilot bit can be stored within the hollow interior of the core barrel, similar to nested dolls, eliminating the need for separate storage space and reducing operational complexity
2Productivity
If the pilot bit is removed during later drilling stages, then drilling efficiency improves, but the process requires skilled personnel and storage space for the pilot bit
Solution Approach 1:
The extendable pilot bit allows the system to switch between extended (guidance mode) and retracted (drilling mode) states dynamically, eliminating the need for manual removal and storage operations, thereby reducing operational complexity while maintaining high drilling efficiency
Solution Approach 2:
The pilot bit system becomes self-managing through its extendable mechanism. The pilot bit can be extended or retracted as needed without requiring skilled personnel to manually remove and store it, making the system self-sufficient and reducing operational complexity
3Loss of time
If a unified multi-cutting edge replaceable bit head is used, then configuration time is reduced, but the design complexity of the bit head increases
Solution Approach 1:
The unified multi-cutting edge replaceable bit head applies the universality principle by integrating multiple cutting edges into a single bit head component. This allows the bit head to perform multiple cutting functions without requiring separate bits for different stages, reducing configuration time while the modular replaceable design manages the inherent complexity
Data Source
AI summary
A system and method for boring a hole in rock with a digger derrick; which utilizes a hollow stem auger, a kelly bar, and a core barrel with a top support member with a hole therein for receiving the kelly bar with a detachable central pilot bit thereon which is translatable up and down with respect to the core barrel as the kelly bar and auger are manipulated. The kelly bar is selectively positionable with respect to the auger so as to allow the ability to retract the pilot bit inward into the core barrel and to shorten the separation between the pilot bit and the auger.