Rock Drill Bit Intake Geometry for Front-End Cuttings Extraction
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Solution Overview
Problem
Conventional drill bits for chiselling rock face challenges in efficiently transporting drill cuttings away from the drilling site, particularly due to the limitations of helical shanks and circular intake openings that hinder effective extraction performance.
Innovation Solution
A drill bit design featuring a hollow shank with noncircular, triangular intake openings and intake passages that are strategically positioned close to the tip, allowing for improved extraction of drill cuttings through a delivery passage, combined with a drill head made of sintered tungsten carbide for enhanced chiselling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If circular intake openings are used, then the structural design is simple, but the extraction performance is poor because the openings cannot be positioned close to the tip
Solution Approach 1:
The patent applies asymmetry by changing the intake opening shape from circular to noncircular (specifically triangular or polygonal with odd number of sides). This asymmetric shape allows the opening to be positioned much closer to the drill tip while maintaining sufficient cross-sectional area for cuttings extraction, directly resolving the contradiction between extraction performance and positioning capability.
Solution Approach 2:
The patent transitions from circular (radially symmetric) to polygonal (angular) geometry, effectively changing the dimensional characteristics of the opening. This dimensional change enables the opening to approach the tip in the axial direction while maintaining adequate area, as the angular shape allows better spatial utilization near the tip region.
2Quantity of substance
If the intake opening cross-sectional area is increased to improve extraction, then more cuttings can be removed, but the opening moves farther from the tip reducing extraction efficiency
Solution Approach 1:
The noncircular (triangular or polygonal) shape allows the opening to maintain a large cross-sectional area while being positioned close to the tip. The angular geometry provides more efficient space utilization, enabling both large area and close positioning simultaneously, thus resolving the contradiction between quantity of cuttings and extraction efficiency.
Solution Approach 2:
The patent changes the geometric parameters of the intake opening from circular to polygonal with specific angle configurations. This parameter change allows the opening to achieve both large cross-sectional area and close proximity to the tip, optimizing both cuttings capacity and extraction performance simultaneously.
3Productivity
If helical shank is used for cuttings removal, then the structure is conventional, but the extraction efficiency is limited
Solution Approach 1:
The patent extracts the cuttings removal function from the helical shank structure and relocates it to the front end of the drill bit through noncircular intake openings. This separation allows the shank to maintain a simple hollow structure while the intake openings at the front end handle cuttings extraction efficiently, resolving the contradiction between extraction efficiency and structural simplicity.
Solution Approach 2:
The patent introduces noncircular intake openings as an intermediary structure between the drill tip and the hollow shank. These openings serve as the primary interface for cuttings entry, while the hollow shank provides the transport passage, creating an efficient two-stage extraction system that overcomes the limitations of conventional helical shanks.
Data Source
AI summary
A drill bit for chiselling rock includes an impact face at an insertion end of the drill bit, a hollow shank, where a delivery passage is defined within the hollow shank, and a drill head, where the drill head has, at a front end of the drill head, a plurality of cutting faces, an intake opening, and an intake passage. The intake passage connects the intake opening to the delivery passage. The intake opening has a noncircular cross section.