Core Bit Cutting Section for Jam Release and Fluid Flow
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Solution Overview
Problem
Drill bits often jam when drilling into reinforced concrete due to iron wedges cut off inside the cutting section, and existing solutions that reduce jamming risk, such as small internal projections, compromise fluid delivery for cooling and rinsing during wet drilling.
Innovation Solution
The cutting section is designed with a first and second closed tubular element, featuring a wave-shaped or zigzag cross-sectional area, allowing for improved fluid transport and reducing manufacturing effort by enabling separate adaptation for force and torque transmission, and incorporating a releasable connecting device with slot-shaped recesses for easy jam release.
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 jamming in substrate is reduced, but the internal gap becomes narrow which compromises cooling and flushing fluid transport capability
Solution Approach 1:
The cutting section is segmented into multiple drill segments that can be individually adjusted or replaced. This segmentation allows optimization of each segment's projection independently while maintaining overall fluid flow paths through the structured arrangement of segments and their mounting structure.
Solution Approach 2:
The patent introduces a multi-dimensional fluid transport system by creating dedicated fluid channels that run parallel to the drill axis and through the mounting structure, rather than relying solely on the radial gap between drill segments and drill shaft. This adds another dimension to fluid delivery, ensuring adequate cooling and flushing even with reduced segment projection.
2Quantity of substance
If the cutting section uses a wave-shaped, trapezoidal or zigzag cross-sectional area to improve fluid flow, then fluid transport is improved, but the manufacturing complexity and effort increase
Solution Approach 1:
The fluid transport function is segmented between the drill shaft's internal channels and the cutting section's mounting structure channels. This division allows each component to be manufactured separately with simpler geometries, avoiding the need for complex wave-shaped or zigzag cross-sections in the entire cutting section while still achieving improved fluid flow through the combined channel system.
3Adaptability or versatility
If the cutting section is designed with separate tubular elements for force and torque transmission, then manufacturing is simplified and adaptability is improved, but the device complexity increases
Solution Approach 1:
The first and second tubular elements are designed with multi-functionality: they provide both structural support for force and torque transmission, and serve as integrated mounting structures for the drill segments. The tubular elements also incorporate fluid channels, combining mechanical support and fluid transport functions in a single component, thereby reducing overall device complexity while maintaining adaptability.
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
The invention relates to a cutting section (11) which can be connected to a drilling shaft section via a releasable connection device. The cutting section comprises a first closed tubular element (14) which is formed in the shape of a first hollow cylinder with a first undulating, trapezoidal, or zigzag-shaped cross-sectional area, a second closed tubular element (15) which is formed in the shape of a second hollow cylinder with a circular cross-sectional area, and one or more drill segments (16) which are connected to the first closed tubular element (14) and the second closed tubular element (15).