Rotary Drilling Tool Pneumatic Soil Removal
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Solution Overview
Problem
Existing rotary drilling tools face challenges in achieving high removal rates, especially when working with hard ground materials like rock, as the impact energy from hammer units is often mitigated by unremoved soil material, leading to inefficient soil removal.
Innovation Solution
Incorporating a pumping device directly on the discharge line of the rotary drilling tool, which uses compressed air to efficiently remove soil material and drilling suspension by applying impact energy directly to the soil, ensuring immediate and rapid removal through the air-lifting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pumping device is not integrated on the discharge line, then the device complexity is reduced, but the removal rate of soil material decreases due to delayed evacuation
Solution Approach 1:
The pumping device is integrated directly onto the discharge line of the rotary drilling tool, merging the soil removal function with the discharge system. This combination ensures immediate evacuation of soil material right at the drilling face, preventing impact energy mitigation and maximizing removal rate without requiring separate distant pumping systems.
Solution Approach 2:
The pumping device is positioned to act preliminarily on the soil material immediately after it is loosened by the hammer elements. By evacuating soil material right at the source before it can accumulate or interfere with subsequent drilling operations, the system maintains continuous high-impact drilling efficiency.
2Productivity
If compressed air is used for air lifting, then the removal of soil material is enhanced, but the energy consumption increases
Solution Approach 1:
Compressed air is utilized as the pumping medium to lift and evacuate soil material through the discharge line. The pneumatic system provides efficient soil removal by creating upward airflow that carries loosened material out of the borehole, leveraging gas dynamics rather than mechanical pumping to achieve high removal rates.
Solution Approach 2:
The compressed air system serves dual functions: it powers the hammer elements for rock breaking and simultaneously acts as the pumping medium for soil evacuation. This self-service approach uses the same energy source for both drilling and removal operations, reducing overall energy consumption compared to separate systems.
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
This configuration allows for a high removal rate by ensuring that the impact energy is maximally applied to the soil, resulting in effective flaking or blasting off of hard ground materials, enhancing the drilling efficiency.
Implementation Method 1
These exert a high point pressure load on hard, brittle material, which leads to spalling and thus removal of soil material
Implementation Method 2
The released compressed air can flow upwards through discharge lines. Soil material and drilling suspension are removed upwards from the borehole
Data Source
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AI summary
The invention relates to a rotary drilling tool and a method for creating a borehole in the ground, comprising a base body, a removal device which has at least one hammer unit comprising an axially reversing hammer element, and a discharge line for removing excavated soil material and drilling fluid. According to the invention, a pumping device is arranged on the base body along the discharge line and is designed to pump the excavated soil material and drilling fluid through the discharge line.