Lightweight Fire-Tube Cleaner Using Inverted Tension Cleaning

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Solution Overview

Problem

Conventional fire-tube boiler cleaning machines are heavy and difficult to use in tight spaces due to the need for significant mass to withstand compressive forces during the cleaning process, which limits their effectiveness and safety.

Innovation Solution

A lightweight, high-strength fire-tube cleaner that utilizes the boiler's mass on the return stroke to propel a brush for cleaning, minimizing friction resistance and eliminating the need for excessive machine weight, with a design that includes a distance monitor and protected drive train for operator safety and ease of use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If conventional fire-tube cleaners use heavy mass to withstand compressive forces, then the machine can push the brush through the tube, but the machine becomes too heavy to use in tight spaces or on elevated platforms

Engineering Contradiction:

Improvecompressive forceVSAvoidmachine weight

Core Design Contradiction:

ForceVSWeight of moving object

Solution Approach 1:

The patent inverts the cleaning stroke direction by making the return stroke the cleaning stroke instead of the forward stroke. The brush cleans the tube interior on the return stroke when the tape is in tension, rather than on the forward stroke when the tape is in compression. This inversion allows the use of lightweight components since the tape only needs to withstand tensile forces during cleaning, not compressive forces.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent replaces the conventional mechanical pushing system with a tension-based pulling system. Instead of using a heavy machine to push the brush through compression, the system uses a lightweight tape that pulls the brush through tension on the return stroke. The drive mechanism uses a reel and tape system that operates in tension rather than compression, eliminating the need for heavy structural components.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Force

If the steel tape is made thick and heavyweight to resist compressive forces, then the brush can be pushed along the tube, but the tape becomes difficult to handle and the machine weight increases

Engineering Contradiction:

Improvecompressive force resistanceVSAvoidtape handling

Core Design Contradiction:

ForceVSEase of operation

Solution Approach 1:

The patent inverts the operational mode from push-stroke cleaning to pull-stroke cleaning. The tape operates in tension during the return stroke when cleaning occurs, rather than in compression during the forward stroke. This allows the use of thin, lightweight tape that is easy to handle and reel, eliminating the need for thick, heavy tape required for compression resistance.

Inventive Principle:

Principle #13The other way round (Inversion)

3Force

If the machine is designed to withstand high loads on the forward stroke, then the brush can be pushed through the tube, but the machine complexity and size increase

Engineering Contradiction:

Improveload withstand capacityVSAvoidmachine structure

Core Design Contradiction:

ForceVSDevice complexity

Solution Approach 1:

The patent inverts the cleaning action to occur on the return stroke when the system is in tension rather than compression. This eliminates the need for complex heavy-duty structural components designed to withstand high compressive loads. The drive train and housing can be much simpler and lighter since they only need to handle tensile forces on a compact reel system.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent replaces the complex compression-resistant mechanical structure with a simple tension-based reel and tape system. The drive mechanism consists of a motor, gearbox, clutch, and final drive located within a compact housing that protects the operator from moving parts and hot surfaces. The tape reel system is much simpler than a heavy-duty compression handling mechanism.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Force

If the brush is designed to minimize friction on the forward stroke, then the push force is reduced, but the cleaning effectiveness may be compromised

Engineering Contradiction:

Improvepush forceVSAvoidcleaning effectiveness

Core Design Contradiction:

ForceVSReliability

Solution Approach 1:

The patent inverts the cleaning stroke to occur on the return stroke when the brush is pulled through tension rather than pushed through compression. The brush minimizes friction on the forward (non-cleaning) stroke by folding over and presenting a smooth profile, then sets up upright on the return stroke to engage the tube interior for effective cleaning. This inversion allows friction minimization during the non-cleaning stroke while maintaining cleaning effectiveness during the cleaning stroke.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS9517496B2Fire-tube boiler cleaner

Publication Date: 2016.12.13 CROSSFORD INTERNATIONAL LLC

AI summary

A tube cleaning machine in which cleaning interior tube surfaces occurs by a forward non-cleaning pass of cleaning implement through work tube followed by reverse cleaning pass where implement engages and cleans interior surface. Cleaning implement has first position for forward pass producing minimum engagement of interior fire-tube surface, and a second position for reverse pass of full cleaning engagement with interior fire-tube surface. A distance indicator enables operator to select distance of forward pass of cleaning implement to correspond with tube length.