Sliding Deflector Roll Structure for Steel Strip Meandering
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Solution Overview
Problem
The existing deflector rolls in steel sheet production facilities cause meandering of metal strips due to frictional forces, leading to production inefficiencies and potential breakage, especially when CPC meandering control devices cannot be installed, and existing solutions like crown rolls or guide rolls have limitations in effectiveness and cost.
Innovation Solution
A deflector roll design featuring a rotatably supported roll main body with a sliding member that is movable along the axial direction, comprising plate-shaped bodies arrayed over the circumference, with centering guides and elastic support, to reduce frictional forces and prevent meandering without structural complications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a CPC meandering control device is installed to prevent metal strip meandering, then meandering control effectiveness is improved, but installation cost and device complexity increase
Solution Approach 1:
The patent extracts the meandering control function from the complex CPC device and implements it through a simple crown roll profile modification. The convex shape on the roll surface provides passive meandering control without requiring active control systems, sensors, or complex mechanisms.
Solution Approach 2:
The patent replaces expensive CPC meandering control devices with a simple, low-cost crown roll design that can be easily manufactured and installed. The convex roll profile is a cost-effective solution that does not require complex components or high maintenance costs.
2Ease of manufacture
If a crown roll with convex roll profile is used to hinder meandering, then cost and installation restrictions are reduced, but meandering control effectiveness decreases compared to CPC devices
Solution Approach 1:
The patent optimizes the crown roll parameters including the convex shape dimensions, position, and curvature to achieve effective meandering control. By carefully adjusting these geometric parameters, the crown roll provides sufficient centering force to prevent metal strip meandering while maintaining ease of manufacture.
3Reliability
If the convex shape of a crown roll is made too high to improve meandering control, then meandering control effectiveness is improved, but contact marks are left on the metal strip due to reduced contact area
Solution Approach 1:
The patent optimizes the convex shape parameters of the crown roll to achieve the right balance. The convex height, width, and curvature are carefully designed to provide sufficient centering force while ensuring adequate contact area between the roll and metal strip, thereby preventing contact marks.
Solution Approach 2:
The patent applies different surface characteristics to different parts of the crown roll. The convex portion provides the necessary centering force, while the surrounding areas maintain good contact with the metal strip to prevent marking. This local differentiation of surface properties resolves the contradiction between control effectiveness and surface quality.
4Reliability
If a guide roll that contacts metal strip edges is used to restrain meandering, then meandering control is improved, but the metal strip may become chipped at the edges due to large colliding force
Solution Approach 1:
The patent removes the harmful edge-contacting guide rolls and extracts only the essential meandering control function, which is achieved through the crown roll profile on the deflector roll itself. This eliminates the colliding force that causes edge chipping while maintaining meandering control effectiveness.
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 effectively reduces meandering and prevents metal strip breakage, allowing for increased production efficiency by minimizing frictional forces and avoiding collisions with the roll frame, while being cost-effective and easy to integrate into existing facilities.
Implementation Method 1
the frictional force that amplifies meandering of the metal strip occurs in the axial direction of the deflector roll (thrust direction)
Implementation Method 2
a sliding member that is provided so as to be movable relative to an outer surface of the roll main body
Data Source
AI summary
A deflector roll, which changes a travelling direction of a metal strip being threaded, includes a roll main body that is rotatably supported by a roll frame and a sliding member that is provided on an outer surface of the roll main body. The sliding member is configured to have the metal strip wrapped thereon and to be movable along an axial direction of the roll main body while maintaining that wrapped state.