Induction Coating Removal Device with Temperature Feedback Control

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Solution Overview

Problem

Existing devices for removing rust and coatings from metal structures, such as those used in the oil and gas industry and maritime sector, face challenges in accurately controlling heat distribution due to varying conditions like paint and rust thickness, and lack effective temperature sensing to prevent overheating and ensure safe operation.

Innovation Solution

A device equipped with a temperature sensor that measures the temperature beneath the coating and a microcontroller to adjust the power output of the induction coil, ensuring controlled heat application by using a temperature-sensing circuit that induces a weak eddy current and calculates temperature based on oscillator frequency changes, and an alternative method using ultrasonic waves to determine metal temperature.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If manual movement of the induction heater unit is used, then the device can be operated flexibly, but the heat supply becomes uneven and difficult to control

Engineering Contradiction:

Improveflexibility of operationVSAvoidheat supply control precision

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent implements a feedback control system where a temperature sensor continuously monitors the temperature of the metal structure, and this temperature information is fed back to the control unit, which automatically adjusts the power output of the induction heater to maintain optimal heating conditions and prevent overheating

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces the manual mechanical control method with an automated electronic control system that uses a microcontroller and temperature sensor to regulate the induction heater's power output, eliminating the need for manual adjustment and ensuring consistent, precise heat supply

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If high power is supplied to the induction coil, then rust and coatings are removed effectively, but overheating occurs causing scorching and unsafe conditions

Engineering Contradiction:

Improverust removal efficiencyVSAvoidoverheating and scorching

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The temperature sensor provides real-time feedback on the temperature of the metal structure, allowing the control unit to automatically reduce power output when approaching dangerous temperature thresholds, thus preventing scorching and unsafe conditions while maintaining effective rust removal

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent employs dynamic power adjustment where the induction heater's power output is continuously varied based on real-time temperature conditions, transitioning from high power for effective rust removal to reduced power to prevent overheating, rather than using fixed power levels

Inventive Principle:

Principle #15Dynamics

3Area of stationary object

If the induction heater is moved to different areas, then comprehensive coverage is achieved, but local conditions vary affecting heating effectiveness

Engineering Contradiction:

Improvecoverage areaVSAvoidheating effectiveness consistency

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The patent implements local quality control by using a temperature sensor to detect specific local conditions (such as variations in paint thickness, rust severity, or metal conductivity) and adjusting the induction heater's power output specifically for that local area, ensuring optimal heating effectiveness for each unique condition encountered

Inventive Principle:

Principle #3Local quality

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

This solution allows for precise temperature control, preventing overheating and ensuring safe operation by adapting to local conditions, maintaining acceptable temperature windows and reducing the risk of scorching or altering the metal properties.

Implementation Method 1

The magnetic field from the induction coil will set up eddy currents in the steel plate, which will be transformed to heat by the ohmic losses in the steel

Methodology Applied

Scientific EffectEddy currents: Eddy Currents

Implementation Method 2

The magnetic field from the induction coil will set up eddy currents in the steel plate, which will be transformed to heat by the ohmic losses in the steel

Methodology Applied

Scientific EffectOhmic losses: Joule Heating

Implementation Method 3

The sensor is adapted to sense temperature in the metal structure by measuring frequency shifts caused by thermal expansion

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS7857914B2Method and device for removing coatings on a metal structure

Publication Date: 2010.12.28 RPR TECH AS

AI summary

A device for removing layers of corrosion and other coatings from a metal surface is disclosed. Said device includes a signal generator driving an induction coil that is positioned on the structure. A control unit includes a temperature sensor that senses the temperature in the metal structure. The control unit is adapted to control the power output of the signal generator in accordance with the temperature in the metal structure.