Coil Hold-Down Arm for Metal Strip Transfer
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Solution Overview
Problem
Conventional methods for handling hot-rolled metal strips with high residual tension struggle to securely transfer and transport coils from the coiling mandrel to the coil stripper car, as the coil can violently uncoil due to insufficient gravity force, especially in small coils with low diameter and high strength.
Innovation Solution
A device with a first hold-down arm that applies a force to the outer circumference of the coil, synchronized with the movement of the coil stripper car, and a second hold-down arm that engages in the coil eye to secure the coil against uncoiling, ensuring continuous stabilization during transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coil stripping methods are used without additional hold-down mechanisms, then the device complexity is low, but the coil can violently uncoil due to insufficient gravity force, especially in small coils with low diameter and high strength
Solution Approach 1:
A hold-down arm is introduced as an intermediary mechanism between the coil and the support structure. The hold-down arm applies a holding force to the coil's outer circumference, preventing violent uncoiling during transfer and transport operations without requiring complex multi-component systems
Solution Approach 2:
The hold-down arm functions as a counterbalancing mechanism that applies a force opposing the coil's tendency to uncoil. By positioning the hold-down arm to apply force at the outer circumference, it creates a counter-moment that balances the uncoiling tendency, especially effective for small-diameter coils with high residual tension
2Quantity of substance
If the coil diameter is small to reduce material usage, then the material consumption is low, but the gravity force is insufficient to prevent violent uncoiling
Solution Approach 1:
The hold-down arm is positioned and activated before the coil transfer operation begins. By applying the holding force in advance to the coil's outer circumference, the system prevents violent uncoiling from occurring in the first place, rather than reacting after uncoiling starts
Solution Approach 2:
The hold-down arm serves as a mediating force that compensates for the insufficient gravity force in small-diameter coils. It provides the additional securing action needed for small coils without requiring increasing the coil diameter or using excessive amounts of material
3Strength
If high-strength metal strips are used to increase product strength, then the product strength is high, but the residual tension increases causing violent uncoiling tendency
Solution Approach 1:
The hold-down arm system converts the harmful effect of high residual tension into a manageable condition. By applying controlled holding forces at specific locations (outer circumference and potentially inner circumference), the system utilizes the tension forces in a controlled manner, preventing violent uncoiling while maintaining the high-strength properties of the metal strip
Solution Approach 2:
The hold-down mechanism applies forces at specific locations on the coil rather than uniformly across the entire coil. The hold-down arm contacts the outer circumference, and potentially a second hold-down arm contacts the inner circumference, creating localized control points that manage the high residual tension in high-strength strips without affecting the overall material properties
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
Prevents violent uncoiling of the coil by applying forces in the direction of gravity, allowing secure transfer and transport of coils with high residual tension, and can be used for coils with or without internal tension.
Implementation Method 1
a first hold-down arm (130) for exerting a first hold-down force (F1) onto the outer circumference of the coil (200) for pressing the coil (200) against supports (124)
Data Source
AI summary
The invention relates to a device and a method for handling a metal strip. The device comprises a coiling device (110) with a coiling mandrel (112) for winding the metal strip to form a coil (200) on the coiling mandrel and a coil stripper car (120) with supports (124) for receiving the coil (200) from the coiling mandrel and removing the coil from the coiling device (110). In order to additionally secure the metal strip in the coiling device during the transfer from the coiling mandrel onto the coil stripper care and during a transport by means of the coil stripper car, a first hold-down arm (130) is provided for exerting a first hold-down force (F1) onto the outer circumference of the coil (200) in order to press the coil onto the supports of the coil stripper car.