Contactless Wiper Liquid Curtain for Roll Gap Sealing
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Solution Overview
Problem
In hot and cold rolling processes, traditional scrapers with mechanical contact lead to ineffective cooling and lubrication due to water or emulsion leakage into the roll gap, causing reduced cooling efficiency and 'oil plate-out' issues, and require frequent maintenance due to wear and tear.
Innovation Solution
A contactless wiping system using a nozzle bar oriented opposite to the rolling direction, creating a liquid curtain that deflects and recovers cooling liquid and lubricant jets, preventing downstream flow and allowing for effective removal without mechanical contact, with adjustable flow rates and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional contact scrapers are used to remove cooling liquid, then liquid removal is achieved, but water leaks into the roll gap causing reduced cooling efficiency and lubrication problems
Solution Approach 1:
The patent replaces the traditional mechanical contact scraper with a contactless wiping system that uses a jet of liquid (water or emulsion) directed opposite to the rolling direction. This jet creates a sealing effect that prevents water from leaking into the roll gap while removing excess liquid from the strip surface, thereby maintaining cooling efficiency and preventing lubrication issues.
Solution Approach 2:
The invention uses a hydraulic jet (liquid curtain) directed against the moving strip or roller surface to achieve the wiping and sealing function. The jet of liquid under pressure creates a barrier that prevents water infiltration into the roll gap while effectively removing excess cooling liquid, resolving the contradiction between liquid removal and preventing leakage.
2Reliability
If contact scrapers are used for liquid removal, then liquid is removed from the surface, but the scrapers require frequent maintenance due to wear and tear
Solution Approach 1:
The patent eliminates mechanical contact between the scraper and the strip or roller surface by using a liquid jet wiping system. This substitution removes the wear and tear issues associated with traditional mechanical scrapers, significantly reducing maintenance frequency while maintaining effective liquid removal capability.
Solution Approach 2:
The contactless wiping system uses a consumable liquid jet (water or emulsion) instead of durable mechanical components that wear out. The jet medium is continuously supplied and discarded after use, eliminating the need for maintenance of mechanical scraper components and reducing overall system maintenance requirements.
3Temperature
If cooling water is not discharged quickly from the product surface, then cooling effectiveness is reduced, but traditional scrapers cause water to leak toward the strip or roll gap
Solution Approach 1:
The patent uses a contactless liquid jet wiping system that effectively discharges cooling water from the strip or roller surface without causing water to leak into the roll gap. The jet creates a controlled sealing effect that directs water away from the lubrication zone, maintaining both cooling effectiveness and proper lubrication conditions.
Solution Approach 2:
The invention introduces a liquid jet (water or emulsion) as an intermediary medium that performs the dual function of removing excess cooling water from the surface and preventing water from entering the roll gap. This intermediary jet acts as a barrier between the cooling water and the lubricant, allowing effective cooling while preventing harmful mixing.
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 system achieves total sealing, enhances early turbulent cooling, reduces maintenance needs, and ensures effective lubrication by preventing liquid and lubricant from entering the roll gap, maintaining strip homogeneity and temperature control.
Implementation Method 1
the nozzle bar being oriented so as to supply a jet comprising a liquid curtain oriented along a direction that is substantially opposite a scrolling direction of the strip or a rotation direction of the cylinder
Implementation Method 2
the liquid sprayed by the nozzles deflects the jet or stream of liquid and/or lubricant driven by the strip or by the cylinder in order to form a combined stream of liquid or mixture of liquid and lubricant
Data Source
AI summary
An industrial facility includes: a metal strip in motion; and/or at least one work cylinder; a contactless wiping system of a cooling liquid and/or lubricant jet or stream driven by a surface of the metal strip in motion or the work cylinder, the wiping system including a separating cleat with integrated supply of cooling liquid ending with a nozzle bar to be placed along a width of the metal strip or the cylinder and separated, during use, by a determined interval with respect to the metal strip or the work cylinder, the nozzle bar being oriented so as to supply a jet in a for of a liquid curtain oriented along a direction that is substantially opposite a scrolling direction of the strip or a rotation direction of the cylinder; and a liquid recovery trough, oriented such that during use, liquid sprayed by the nozzles deflects the jet.