Ground Drilling Rotary Blade Lubrication With Fine Oxygen Bubbles

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Solution Overview

Problem

Conventional ground drilling devices face issues such as wear of rotary blades, reduced life of components due to friction and hydrogen sulfide corrosion, and increased maintenance frequency, particularly in tunnel construction and soil improvement methods.

Innovation Solution

Incorporation of a lubricating liquid jetting device that uses high-concentration mud water with fine oxygen bubbles generated by a carbon-based porous medium to enhance lubricity and suppress hydrogen sulfide corrosion, combined with a solidifying lubricant for reduced friction and extended component life.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional injection material is used to stabilize the working face, then the working face is stabilized, but friction is generated between the liquefied high-concentration mud water and the working face causing wear and load

Engineering Contradiction:

Improveworking face stabilityVSAvoidfriction and wear

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the injection material by adding specific additives (such as corrosion inhibitors, lubricants, and hydrogen sulfide scavengers) to the conventional mud water system. This modifies the properties of the liquefied soil to reduce friction and wear while maintaining stability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite injection material system that combines conventional mud water with specialized chemical additives. This composite material provides both the stabilization function and the protective functions (reduced friction, corrosion protection, hydrogen sulfide neutralization) simultaneously

Inventive Principle:

Principle #40Composite materials

2Reliability

If conventional injection material is used, then the working face is stabilized, but hydrogen sulfide causes corrosion and deterioration of metal components

Engineering Contradiction:

Improveworking face stabilityVSAvoidhydrogen sulfide corrosion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful hydrogen sulfide gas into a beneficial effect by introducing substances that react with hydrogen sulfide to neutralize it. The harmful corrosive gas is transformed into harmless or beneficial compounds, protecting metal components while maintaining working face stability

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The chemical composition of the injection material is modified to include hydrogen sulfide scavengers and corrosion inhibitors, changing the chemical environment to be non-corrosive while maintaining the physical stabilization function

Inventive Principle:

Principle #35Parameter changes

3Reliability

If high-concentration mud water is used to prevent looseness of natural ground, then water cut-off performance is improved, but friction is generated causing wear and load on drilling cutter

Engineering Contradiction:

Improvewater cut-off performanceVSAvoidfriction and wear on drilling cutter

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the rheological and chemical parameters of the high-concentration mud water by adding lubricants and corrosion inhibitors, reducing the friction coefficient between the mud water and drilling cutter while maintaining the water cut-off performance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

A composite mud water system is created combining bentonite or other stabilizing agents with lubricating additives and corrosion protectors, achieving both high water cut-off performance and reduced friction

Inventive Principle:

Principle #40Composite materials

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

Enhances lubricity, reduces wear and maintenance time, extends the life of components, and shortens construction periods by suppressing hydrogen sulfide corrosion and maintaining lubricity through the use of fine oxygen bubbles.

Implementation Method 1

a bubble generating medium for supplying oxygen in a high pressure state as fine bubbles to the lubricating liquid

Methodology Applied

Scientific EffectFine bubble generation: Bubble

Implementation Method 2

an oxygen supply device that supplies oxygen to the lubricating liquid

Methodology Applied

Scientific EffectOxidation: Oxidation

Implementation Method 3

a bubble generating medium for supplying oxygen in a high pressure state as fine bubbles to the lubricating liquid

Methodology Applied

Scientific EffectPorous material gas generation: Capillary Porous Material

Data Source

PatentUS12467320B2Ground drilling device

Publication Date: 2025.11.11 ANZAI SATOSHI

AI summary

Provided a ground drilling device capable of reducing the maintenance time by suppressing wear of the rotary blade, extending the life of each component, and reducing the frequency of drilling pipes. The ground drilling device includes: the rotary blade that excavates the ground; the lubricating liquid jetting device that jets the lubricating liquid to the rotary blade when excavating the ground, and the oxygen supply device that supplies oxygen to the lubricating liquid, in which the oxygen supply device has the bubble generating medium for supplying oxygen in a high pressure state as fine bubbles to the lubricating liquid.