Magnetic Cooling Roll for Strip Flatness Control
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Solution Overview
Problem
Existing cooling roll technologies for metallic strips suffer from uneven contact and inefficient heat transfer, leading to flatness defects and temperature variations along the strip width, resulting in degraded strip quality and inadequate cooling homogeneity.
Innovation Solution
A cooling roll design featuring a sleeve with an inner cylinder, magnets on its periphery, and a cooling system separated by a controlled gap, where the magnet width is optimized within a specific ratio to the gap height to enhance magnetic attraction and heat transfer efficiency, ensuring homogeneous cooling without compromising strip flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If magnets are provided inside a roll body with a cooling tube wrapped helicoidally around the magnets, then the cooling system is compact, but the strip is not sufficiently in contact with the roll leading to contact unevenness and flatness defects
Solution Approach 1:
The patent inverts the conventional arrangement by placing magnets in the outer shell rather than inside the roll body, and positioning the cooling system inside instead of wrapping it externally. This inversion allows the strip to be attracted to the outer surface where magnets are located, ensuring sufficient contact pressure for homogeneous cooling without flatness defects.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary force between the cooling roll and the strip. The magnets in the outer shell create magnetic attraction that pulls the strip onto the roll surface, ensuring adequate contact pressure for effective heat transfer while maintaining strip flatness.
2Force
If magnets are disposed in the outer shell of the roll with heat carrier inside, then the magnetic attraction is enhanced, but the cooling system does not permit sufficient and homogeneous cooling leading to temperature variations
Solution Approach 1:
The patent uses the gap between the inner cylinder and outer shell as a magnetic field intermediary zone. This gap allows magnetic flux to penetrate through to the strip while the cooling system inside the inner cylinder provides homogeneous cooling through thermal conduction, preventing temperature variations.
Solution Approach 2:
The patent applies different properties to different zones: the outer shell contains magnets for strong magnetic attraction, the gap provides magnetic field penetration, and the inner cooling system ensures homogeneous cooling. This local differentiation resolves the contradiction between magnetic force and temperature uniformity.
3Productivity
If the gap height between magnets and cooling system is reduced to improve heat transfer, then cooling efficiency increases, but the magnetic attraction force decreases
Solution Approach 1:
The patent optimizes the gap height to a specific range (0.5-5mm) that locally balances magnetic attraction and heat transfer needs. This controlled gap maintains sufficient magnetic force while allowing adequate thermal conduction through the strip contact layer.
Solution Approach 2:
The patent changes the gap height parameter within an optimized range rather than minimizing it completely. This parameter optimization achieves the balance between maintaining magnetic attraction force and ensuring sufficient heat transfer efficiency.
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 achieves significant improvement in temperature homogeneity along the strip width, reducing flatness defects and ensuring uniform cooling, with at least 70% of the maximal attractive force maintained within optimized gap and magnet width ratios, thereby enhancing the quality and efficiency of the cooling process.
Implementation Method 1
attracting magnetically a portion of said strip (15) to at least one cooling roll (1)
Implementation Method 2
The strip is majorly cooled down due to the thermal conduction between the cooled cooling roll and the strip
Data Source
AI summary
A cooling roll including an axle and a sleeve, the sleeve having a length and a diameter and being structured as follows: an inner cylinder, a plurality of magnets disposed along at least a portion of the inner cylinder length, each magnet being defined by a width, a height and a length, a cooling system surrounding at least a portion of the plurality of magnets, the cooling system and the plurality of magnets being separated by a gap defined by a height, the gap height being the smallest distance between a magnet and the cooling system above, the magnets having a width such that the following formula is satisfied:gap height×1.1≤magnet width≤gap height×8.6.