Pre-cooling System for Metal Strip Coating Segmentation
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Solution Overview
Problem
Current pre-cooling systems for metal strips with liquid coatings struggle to balance cooling air flow rate and pressure uniformly across the entire height, leading to potential wavy layers or microstructure flaws, as they are incompatible with the coating's liquid phase and thickness, especially during rapid cooling processes.
Innovation Solution
The system divides the cooling box into sections with internal regulating devices, such as diffusers or rotary flaps, actuated by pneumatic or electromechanical actuators, to adjust gas flow rate and pressure independently across different sections, ensuring uniform cooling and preventing flaws by regulating the primary and secondary flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the cooling air flow rate and pressure are increased to cool the coating quickly, then the solidification speed improves, but the liquid coating develops wavy layers or marks due to excessive gas impact
Solution Approach 1:
The cooling box is divided into multiple sections along the strip travel direction, with each section having independent flow rate/pressure control. This allows different cooling intensities to be applied at different positions, preventing excessive impact on liquid coating while maintaining rapid solidification where needed.
Solution Approach 2:
Each section of the cooling box can be independently regulated to provide locally optimized cooling conditions. The internal regulating devices adjust gas flow rate and pressure according to the specific requirements of each section, ensuring uniform cooling without creating wavy layers or marks on the coating surface.
2Manufacturing precision
If the cooling air flow rate is reduced to prevent coating flaws, then the coating quality improves, but the solidification speed decreases leading to intermetallic growth
Solution Approach 1:
By segmenting the cooling box into multiple independently controlled sections, the system can maintain lower flow rates in sections where liquid coating is present (preventing flaws) while applying higher flow rates in sections where solidification is prioritized (preventing intermetallic growth).
Solution Approach 2:
The internal regulating devices enable dynamic adjustment of gas flow rate and pressure in each section. This dynamic control allows the system to adapt cooling intensity to the real-time state of the coating, transitioning from protective low-intensity cooling to aggressive high-intensity cooling as needed.
3Adaptability or versatility
If the cooling box is divided into sections with independent control, then the flow rate and pressure can be adjusted uniformly across different sections, but the device complexity increases
Solution Approach 1:
The cooling box is divided into multiple sections, each equipped with internal regulating devices that can independently adjust gas flow rate and pressure. This segmentation enables flexible adaptation to different coating types and thicknesses while maintaining a relatively simple overall structure through modular design.
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 control of cooling gas flow, ensuring uniform cooling across the metal strip, preventing intermetallic growth and achieving optimal coating quality by adjusting the flow rate and pressure parameters based on strip and coating types, thereby enhancing the microstructure and corrosion resistance.
Implementation Method 1
pre-cooling units called 'pre-coolers' or cooling units called 'air cooling boxes or air coolers or ducts' are used, made using technologies and constructions of slots, nozzles or holes... blowing a gas over a continuously moving metal strip
Data Source
AI summary
The invention relates to equipment for cooling a metal strip (2) having a liquid coating to be solidified, wherein said strip is continuously moving. Said equipment is characterized in that each half-cooler (11, 12) is divided, over the length thereof, into at least two sections, a first section (13) and a second section (14), in the direction of the movement of the strip (2). The first section (13) is separated from the second section (14) in each half-cooler (11, 12) by a respective internal adjustment device (7, 8), making it possible to change the gas flow/pressure parameter so that the value of said gas flow/pressure parameter is different in the first section (13) from the value of said parameter in the second section (14).