Telescopic Slag Door Panel for Electric Arc Furnace Scraping
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Solution Overview
Problem
Existing slag doors in electric arc furnaces have limited scraping effectiveness due to restricted movement of the lower panel, which hinders efficient removal of slag and materials around the slag discharge opening.
Innovation Solution
A telescopic slide-out structure for the lower panel allows for extended movement into the furnace interior and back, enabling effective scraping along the slag discharge opening and adjacent surfaces, combined with non-linear movement patterns and hydraulic actuation for enhanced cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lower panel follows a lever parallelogram mechanism, then the panel can be pushed through the slag discharge opening into the furnace, but the scraping path is limited with respect to its length and effectiveness
Solution Approach 1:
The patent transforms the static lever parallelogram mechanism into a dynamic telescopic slide-out structure that extends the scraping path. The lower panel incorporates a telescopic mechanism with multiple segments that can extend and retract, allowing the panel to reach further into the furnace interior and scrape along longer surface areas while maintaining operational control.
Solution Approach 2:
The invention adds an extension dimension to the lower panel by incorporating a telescopic slide-out structure. This allows the panel to not only move along the original lever parallelogram path but also extend further into the furnace interior, creating a multi-dimensional movement capability that significantly increases the scraping path length and effectiveness.
2Productivity
If the lower panel is hinged for scraping movement, then the panel can contact furnace surfaces, but the scraping path is limited in length
Solution Approach 1:
The lower panel is divided into multiple telescopic segments that can extend and retract independently. This segmentation allows the panel to achieve a longer overall scraping path while maintaining the flexibility needed for effective contact with furnace surfaces. The segmented structure enables the panel to navigate complex geometries while extending the total scraping distance.
Solution Approach 2:
The telescopic slide-out structure employs a nested configuration where multiple panel segments are housed within each other. When extended, these nested segments unfold to provide a significantly longer scraping path. When retracted, they nest back into a compact form, allowing the panel to maintain its hinged movement capability while dramatically increasing the available scraping length.
3Length of moving object
If a telescopic slide-out structure is implemented, then the panel can be moved along a long distance into the furnace, but the device complexity increases
Solution Approach 1:
The telescopic slide-out structure is integrated with the existing lever parallelogram mechanism to create a multi-functional system. The lower panel serves both as a closing element for the slag door and as a scraping tool with extended reach. This universal design allows the same structure to perform multiple functions (closing, scraping, reaching) without requiring entirely separate mechanisms, thereby reducing overall system complexity despite the added telescopic capability.
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
The telescopic slide-out design enables reproducible and quick removal of slag and materials from all areas around the slag discharge opening, improving scraping efficiency and adaptability to irregular surfaces.
Implementation Method 1
hydraulic actuation for enhanced cleaning
Data Source
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AI summary
The invention relates to a furnace slag door, comprising at least one panel which is moveable, in a mounted state of the slag door, from an opened position, in which the panel is remote from a corresponding slag discharge opening within the furnace wall to a closed position, in which the panel covers at least part of said slag discharge opening. The invention further comprises a corresponding furnace equipped with such slag door. The furnace is, in particular, an electric arc furnace (EAF) but may be as well of another type.