Movable Electromagnet Crossbow Correction for Steel Strip Leveling
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Solution Overview
Problem
Existing crossbow correction devices for steel strips in molten metal plating facilities face challenges in efficiently correcting the shape of steel strips due to increased magnetic force requirements, which can lead to inadequate correction when the load applied to electromagnets reaches its maximum capacity.
Innovation Solution
A crossbow correction device comprising a plurality of electromagnets arranged in the strip width direction, with a moving mechanism and a controller that adjusts the current value flowing through the electromagnets to efficiently correct the shape of the steel strip by moving the electromagnets relative to the strip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnetic force of each electromagnet is controlled based on a distance sensor to position the steel strip at a central position, then the steel strip positioning is improved, but the load applied to the electromagnets increases and may reach maximum magnetic force capacity
Solution Approach 1:
The patent makes the electromagnets movable relative to the steel strip during conveyance, transforming the static electromagnet system into a dynamic one. This allows the electromagnets to follow the steel strip's movement and maintain optimal positioning without requiring excessive magnetic force, thereby resolving the contradiction between positioning precision and magnetic force load.
Solution Approach 2:
The patent changes the operational parameter by moving the electromagnets relative to the steel strip based on current value feedback. This dynamic parameter adjustment allows the system to maintain effective correction while reducing the peak magnetic force requirements, addressing both positioning accuracy and force load concerns.
2Power
If the load applied to the electromagnets reaches maximum magnetic force, then the electromagnets are operating at full capacity, but crossbow correction of the steel strip cannot be performed appropriately
Solution Approach 1:
By making the electromagnets movable and controlling their position based on current values during steel strip conveyance, the system dynamically adjusts the magnetic force application points. This prevents overload conditions while maintaining effective crossbow correction, allowing the electromagnets to operate within optimal force ranges rather than at maximum capacity.
Solution Approach 2:
The patent implements feedback control by moving the electromagnets based on current value measurements during the conveyance process. This closed-loop control ensures that the electromagnets operate within safe load limits while maintaining effective correction performance, preventing the situation where maximum force is reached but correction quality deteriorates.
3Manufacturing precision
If a plurality of electromagnets are arranged in the strip width direction to correct crossbow, then the correction capability is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple electromagnets into an integrated assembly that moves together relative to the steel strip. This merging approach maintains the correction capability of multiple electromagnets while simplifying the overall system control and reducing the complexity of individual electromagnet positioning mechanisms.
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 efficient correction of the steel strip's crossbow shape by optimizing the magnetic force distribution, reducing the load on electromagnets and enabling effective leveling without restricting the movement of the steel strip, thereby improving the uniformity of the metal plating process.
Implementation Method 1
The magnetic force of the electromagnets acts on portions of the steel strip facing the electromagnets and sucks (levels) the portions of the steel strip
Implementation Method 2
a moving mechanism capable of moving the electromagnets relative to the steel strip; and a controller configured to operate the moving mechanism, based on a current value flowing through the electromagnets
Data Source
AI summary
A crossbow correction device 16 for correcting crossbow of a steel strip S by a magnetic force during conveyance includes a plurality of electromagnets 57a to 57d, 67a to 67d arranged in a strip width direction of the steel strip S and facing each other so as to sandwich the steel strip S in a strip thickness direction, a moving mechanism 51 to 54, 61 to 64 capable of moving the electromagnets 57a to 57d, 67a to 67d relative to the steel strip S, and a controller 17 configured to operate the moving mechanism 51 to 54, 61 to 64, based on a current value flowing through the electromagnets 57a to 57d, 67a to 67d.