Drill Bit Cutting Section With Zigzag Flow Path Against Jamming
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Solution Overview
Problem
Drill bits often jam during reinforced concrete drilling due to iron wedges, and existing solutions with small internal projections hinder effective cooling and flushing liquid transport, leading to inefficiencies in wet drilling.
Innovation Solution
A cutting section design featuring a first open tubular element with a waved, trapezoidal or zigzag-shaped cross-sectional area and a second closed tubular element with a circular ring-shaped cross-sectional area, allowing for improved liquid transport and reduced manufacturing complexity by separating force and torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the internal projection of drill segments is reduced to minimize jamming risk, then the risk of cutting section becoming jammed in substrate is reduced, but the inner gap becomes narrow which hinders cooling and flushing liquid transport
Solution Approach 1:
The cutting section is divided into two separate tubular elements: a first open tubular element with waved/trapezoidal/zigzag cross-section for liquid transport, and a second closed tubular element with circular cross-section for structural support and torque transmission. This segmentation allows each element to be optimized for its specific function without compromise.
Solution Approach 2:
The first tubular element introduces a non-circular cross-sectional geometry (waved, trapezoidal, or zigzag shape) that creates additional space dimensionally, enabling sufficient inner gap width for effective liquid transport while maintaining the small internal projection configuration that prevents jamming.
2Productivity
If transport channels are added to improve liquid supply in drill bits with small internal projection, then cooling and flushing liquid transport is improved, but device complexity increases
Solution Approach 1:
The first open tubular element serves multiple functions simultaneously: it provides the structural framework for the cutting section, enables effective cooling and flushing liquid transport through its non-circular cross-section, and contributes to torque transmission. This multi-functionality eliminates the need for separate transport channels.
Solution Approach 2:
By changing the cross-sectional geometry parameter from circular to waved/trapezoidal/zigzag shape, the inner gap dimensions are optimized for liquid flow without adding complex internal channel structures, achieving improved liquid transport with minimal increase in device complexity.
3Ease of manufacture
If a single tubular element design is used, then manufacturing is simpler, but the ability to adapt to different torque and tensile loading demands is reduced
Solution Approach 1:
The cutting section is segmented into two tubular elements with distinct functional optimizations: the first open tubular element with non-circular cross-section optimized for liquid transport and tensile loading, and the second closed tubular element with circular cross-section optimized for torque transmission and structural strength. This segmentation enables adaptation to different drilling demands while maintaining manufacturing feasibility.
Solution Approach 2:
Different regions of the cutting section are assigned different structural qualities: the first tubular element has a non-circular cross-section providing enhanced liquid flow channels and tensile strength, while the second tubular element has a circular cross-section providing optimal torque resistance and structural integrity. Each local region is optimized for its specific functional requirement.
Data Source
AI summary
A cutting section (11) which is connectable to a drill shaft section via a releasable connecting device. The cutting section includes a first open tubular element (14) which is in the form of a first hollow cylinder having a first waved, trapezoidal or zigzag-shaped cross-sectional area, a second closed tubular element (15) which is in the form of a second hollow cylinder having a circular ring-shaped cross-sectional area, and one or more drill segments (16) which are connected to the first open tubular element (14) and to the second closed tubular element (15).