Adjustable Drilling Head With Groove Ring Locking
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Solution Overview
Problem
Existing drilling devices face challenges in detaching the protective pipe from the pilot bit when drilling through rock and in retracting the pilot bit and wing bits through the protective pipe, due to the requirement for a large diameter difference and the complexity of connections like bayonet connections.
Innovation Solution
The drilling device features a circumferential groove on the outer circumference of the wing bits to receive a ring from the protective pipe, allowing for adjustable wing bit positions and a reduced inner diameter of the protective pipe, enabling easier pulling and rotation locking, and reversible drilling directions for extended and retracted wing bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bayonet connection is used between the protective pipe and the pilot bit, then the protective pipe can be securely attached, but the diameter difference between the protective pipe and the pilot bit becomes excessively large
Solution Approach 1:
The patent introduces a circumferential groove as an intermediary structure on the pilot bit that receives a ring from the protective pipe. This groove-ring mechanism serves as a mediator between the protective pipe and pilot bit, enabling secure attachment without requiring excessive diameter difference. The groove is formed at a location where the wing bits are extended, allowing the ring to be received and secured in this intermediate zone.
2Ease of operation
If the protective pipe inner diameter is reduced to allow pilot bit and wing bits retraction, then the device can be pulled through the pipe in both directions, but the pipe becomes more prone to blocking by soil material
Solution Approach 1:
The patent employs dynamic adjustment of the wing bits between extended and retracted positions. When the wing bits are extended, they create a larger drilling diameter that prevents soil material from blocking the protective pipe. When retracted, they allow the pilot bit and wing bits to be pulled through the protective pipe in both directions. This dynamic configuration resolves the contradiction between retraction capability and blocking prevention.
3Reliability
If the circumferential groove is positioned where the wing bits are extended, then the ring is securely received and locking is achieved, but the structure becomes more complex
Solution Approach 1:
The patent merges the circumferential groove structure with the existing wing bit extension mechanism. The groove is integrated into the pilot bit body at the location where the wing bits naturally extend during drilling operations. This merging approach allows the locking function to be achieved without adding separate complex structures, as the groove utilizes the existing spatial configuration of the extended wing bits.
Data Source
AI summary
A drilling device for drilling a hole in the ground and/or rock and having in its drilling head a plurality of drilling wing bits arranged at equal distribution with their mutual position being adjustable such that the wing bits are located within a minimum diameter dimension and, on the other hand, adjustable such that they are located to drill a hole with a maximum size diameter and that the drilling device is arranged to pull, during drilling, a protective pipe into the hole at least when drilling the hole in the ground. An outer circumference of the wing bits includes a circumferential groove arranged to receive a ring belonging to a front part of the protective pipe, to an inner surface thereof, when the wing bits are adjusted to a diameter size substantially larger than the minimum diameter dimension in order to pull the protective pipe via the wing bits.