Rotatable Drilling Head Tip for Directional Control
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Solution Overview
Problem
Existing ground drilling technologies face challenges in accurately directing drill strings, particularly in horizontal drilling, due to the need for complex mechanical devices and high power requirements for rotation and steering, which are cumbersome and inefficient.
Innovation Solution
A controllable drilling head with a drilling head tip having a bore angled to the longitudinal axis and a locating pin that can be rotated relative to each other, allowing for two angular positions to enable straight drilling and course correction without constant asymmetry, reducing the need for complex rotary drives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a permanently asymmetrical driving head is used for constant steering movement, then directional control of the drill string is achieved, but device complexity and machinery requirements increase significantly
Solution Approach 1:
The drilling head tip is made rotatable relative to the locating pin, transforming the static asymmetrical design into a dynamic system. This allows the drilling head tip to be rotated to different angular positions (first angular position for straight drilling, second angular position for course correction) without requiring complex mechanical steering devices. The rotatable connection enables directional control through simple rotation rather than complex mechanical steering mechanisms.
2Ease of operation
If a permanently asymmetrical driving head with constant rotation is used, then directional control is achieved, but power requirements and drive complexity increase
Solution Approach 1:
Instead of requiring constant rotation and sustained power input, the system uses periodic action through manual rotation of the drilling head tip to two specific angular positions. The first angular position maintains straight drilling, and the second angular position enables course correction. This eliminates the need for continuous high-power rotation drives while achieving effective directional control through intermittent positional adjustments.
3Ease of operation
If the drilling head tip is constantly moved for straight travel, then directional control is maintained, but mechanical complexity increases
Solution Approach 1:
The asymmetry required for directional control is extracted from the overall drilling head structure and concentrated into the rotatable connection between the drilling head tip and locating pin. By taking out the asymmetrical steering function and isolating it to a simple rotatable joint with angular position markings, the rest of the mechanical structure can remain simple and symmetrical, significantly reducing overall mechanical complexity while maintaining directional control capability.
Data Source
AI summary
A controllable drilling head for a drill string for ground drilling with a drilling head tip and a locating pin that carries the drilling head tip, the drilling head tip having a bore slanted to the longitudinal axis and the locating pin being angled to the longitudinal axis, wherein the drilling head tip can rotate on the locating pin, the drilling head tip and the locating pin being arranged in a first angular position relative to one another for straight drilling, and the drilling head tip and the locating pin being arranged in a second angular position relative to one another for drilling that deviates from straight drilling.