Flow Regulating Member Suppressing Bottom Dross Stir-up
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Solution Overview
Problem
Existing flow regulating members in hot dip galvanizing systems are cumbersome to replace, waste energy during preheating, and inadequately prevent bottom dross stir-up, especially at high steel sheet running speeds and widths.
Innovation Solution
A flow regulating member with horizontal plates and side members featuring dispersion holes attenuates the trailing flow, changing its direction and dispersing it, thereby preventing bottom dross stir-up without being attached to the sink roll or roll support members, allowing for easier maintenance and reducing energy waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flow regulating members are attached to roll support members or sink roll to prevent bottom dross stir-up, then bottom dross defects are prevented, but replacement of sink roll becomes troublesome and requires line stop
Solution Approach 1:
The flow regulating member is segmented into a first flow regulating member attached to the roll support member and a second flow regulating member attached to the sink roll. This segmentation allows the first member to remain stationary in the coating tank while the second member moves with the sink roll, enabling easy replacement of the sink roll without requiring removal of the entire flow regulation system.
Solution Approach 2:
The first flow regulating member serves as an intermediary component that remains fixed to the roll support member while the second flow regulating member is temporarily attached to the sink roll. This intermediary structure allows the flow regulation function to be maintained during sink roll replacement operations.
2Reliability
If flow regulating members are attached to sink roll and roll support members, then bottom dross stir-up is prevented, but energy is wasted for preheating these components
Solution Approach 1:
The flow regulation function is extracted from the sink roll and roll support member assembly and implemented as a separate, stationary first flow regulating member attached to the roll support member. This extraction allows the sink roll to be heated independently without the need to preheat the flow regulating members, reducing energy waste during the preheating phase.
3Reliability
If flow regulating members entirely cover the bottom of sink roll, then bottom dross stir-up is prevented, but drooping steel sheet contacts the members and causes damage
Solution Approach 1:
The flow regulating members are designed with local quality - the first flow regulating member is positioned at the bottom of the coating tank to regulate flow and prevent dross stir-up, while the second flow regulating member is positioned only at the lower end of the sink roll. This localized positioning ensures effective flow regulation without creating obstacles that would contact and damage the drooping steel sheet during tension easing operations.
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
Effectively suppresses bottom dross stir-up, ensuring a continuous hot dip coating process with improved operational efficiency and reduced defects on the steel sheet surface.
Implementation Method 1
side members which are arranged at positions separated from the two ends of the sink roll, which extend upward from the end parts of the respective horizontal plates, and in which large numbers of dispersion holes are formed
Data Source
AI summary
A flow regulating member of a hot dip coating tank which is able to suppress stir-up of bottom dross, characterized by being provided with flow regulating member horizontal plates which are respectively arranged horizontally from below two side end parts of a sink roll, which is arranged inside of a coating tank in a rotatable manner, toward outside directions of the sink roll and side members which are arranged at positions separated from the two ends of the sink roll, which extend upward from the end parts of the respective horizontal plates, and in which large numbers of dispersion holes are formed, the side members having an aperture ratio of 20 to 80%, and the dispersion holes having a hole diameter of 5 to 50 mm.