Molten Metal Sampler Assembly With Axial De-Oxidant Mounting
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Solution Overview
Problem
Conventional samplers for molten metal analysis face issues with de-oxidant material distribution and surface preparation, leading to inaccurate carbon readings and variance in analysis results, especially in high oxygen applications, due to incomplete de-oxidation and surface oxidation.
Innovation Solution
A sampler design with a de-oxidant material rigidly mounted along the central axis of the sample chamber, capable of withstanding purge gas forces, and a metal bushing for coupling the inflow conduit to the sample chamber, eliminating the need for glues or cements, ensures homogeneous de-oxidation and precise carbon readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If de-oxidant material is added to the sampler for high oxygen applications, then de-oxidation effectiveness is improved, but material distribution homogeneity deteriorates due to incomplete dissolution and aggregation
Solution Approach 1:
The de-oxidant material is divided into multiple small granules instead of using a single large piece. This segmentation allows the material to distribute more uniformly throughout the molten metal bath, preventing aggregation while maintaining adequate de-oxidation effectiveness through cumulative action of multiple smaller units
Solution Approach 2:
The sampler design incorporates a specific inflow conduit geometry that creates localized turbulence zones where de-oxidant granules are introduced. This local quality enhancement ensures that the de-oxidant material is dispersed in regions of high fluid motion, promoting uniform distribution while maintaining de-oxidation effectiveness
2Device complexity
If conventional sampling devices are used, then sampling process is simplified, but surface oxidation occurs leading to inaccurate carbon readings
Solution Approach 1:
The sampler incorporates an inert gas atmosphere within the sampling chamber that prevents oxidation of the molten metal surface during the sampling process. This inert environment protects the sample from surface oxidation while maintaining a simple sampling operation, thereby ensuring accurate carbon readings without compromising process simplicity
Solution Approach 2:
The sampler is pre-heated to molten metal temperature before insertion into the bath, and the sampling chamber is prepared with inert atmosphere in advance. This preliminary action prevents surface oxidation from the moment of sampling, ensuring accurate carbon readings while keeping the overall process simple and straightforward
3Stability of the object's composition
If de-oxidant material is rigidly mounted along the central axis, then material distribution homogeneity is improved, but device complexity increases due to mounting requirements
Solution Approach 1:
The de-oxidant material is designed to be self-mounting through its own weight and the flow dynamics of the molten metal. As the sampler is inserted, the molten metal flow automatically positions the de-oxidant granules along the central axis of the inflow conduit, eliminating the need for complex rigid mounting structures while achieving homogeneous distribution
Solution Approach 2:
The molten metal flow itself acts as an intermediary that transports and positions the de-oxidant material along the central axis. This natural convection current serves as the mounting mechanism, replacing complex mechanical mounting structures with a simple, flow-driven positioning system that achieves homogeneous distribution
4Ease of manufacture
If glues or cements are used for coupling components, then device assembly is simplified, but carbon reading accuracy deteriorates due to contamination
Solution Approach 1:
The design completely removes glues and cements from the coupling process by using mechanical interference fits and thermal expansion differences between components. This extraction of harmful materials eliminates carbon contamination sources while maintaining simple assembly through precision-machined mating surfaces and snap-fit mechanisms
Solution Approach 2:
Chemical bonding methods (glues/cements) are replaced with purely mechanical coupling methods including interference fits, snap-fits, and thermal assembly techniques. This mechanical substitution eliminates organic contamination while maintaining ease of assembly through standardized mechanical joining features
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 solution minimizes preheating of the de-oxidant material, maintains its effectiveness across varying temperatures, and prevents surface oxidation, resulting in accurate and consistent elemental analysis without the need for surface preparation.
Implementation Method 1
the de-oxidant material which is rigidly mounted and held in position, can dissolve in the steel entering the cavity
Implementation Method 2
de-oxidant material arranged along the central axis in the entry path of the sample chamber... capable to dissolve immediately at the very first moment of filling
Implementation Method 3
capable to withstand the force of a purging gas while purging
Implementation Method 4
Before the first entering steel can cool a cavity of the sample chamber formed by the cover plate and housing
Data Source
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AI summary
The present invention relates to a sampler for taking samples from a molten metal bath, particularly a molten steel bath, the sampler comprising: a carrier tube having an immersion end; a sample chamber assembly arranged on the immersion end of the carrier tube, the sample chamber assembly comprising a cover plate and a housing, wherein the housing comprises an immersion end having an opening; an inflow conduit having a first end for receiving molten metal and a second end, opposite the first end, wherein the second end is in communication with the opening, wherein the opening is configured to receive the molten metal from the inflow conduit; a measuring head, wherein the sample chamber and the second end of the inflow conduit are at least partly arranged in the measuring head; and a de-oxidant material arranged along a central axis of the inflow conduit, wherein at least part of the de-oxidant material is arranged near the second end of the inflow conduit inside the measuring head, and wherein the inflow conduit comprises first coupling means, arranged on the second end of the inflow conduit, wherein the de-oxidant material comprises second coupling means, to interact with the first coupling means on the inflow conduit to anchor the de-oxidant material in a position along the central axis of the inflow conduit. The invention also relates to a sampler for taking samples from a molten metal bath, particularly a molten steel bath, the sampler comprising: a carrier tube having an immersion end; a sample chamber assembly arranged on the immersion end of the carrier tube, the sample chamber assembly comprising a cover plate and a housing, wherein the housing comprises an immersion end having an opening; an inflow conduit having a first end for receiving molten metal and a second end, opposite the first end, wherein the second end is in communication with the opening, wherein the opening is configured to receive the molten metal from the inflow conduit; a measuring head, wherein the sample chamber and the second end of the inflow conduit are at least partly arranged in the measuring head; and a metal bushing, wherein the metal bushing coupling the inflow conduit to the sample chamber.