Rolling Mill Cooling Device Scraper Jet Orientation
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Solution Overview
Problem
Existing cooling devices for hot rolling mills face frequent thermal and mechanical stress, leading to frequent replacements and production interruptions due to the mechanical scraper's inability to prevent cooling fluid from contacting the metallic product effectively.
Innovation Solution
A cooling device that projects cooling jets and scraper jets under pressure, with scraper jets oriented at a re-entrant angle to prevent fluid contact with the product, allowing for improved service life and continuous operation without production stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a mechanical scraper is used to block cooling fluid flow, then cooling fluid contact with metallic product is prevented, but the scraper undergoes thermal and mechanical constraints requiring frequent replacement and production interruption
Solution Approach 1:
The harmful mechanical scraper component is completely removed from the system. Instead, the patent uses a fluid dynamic approach where scraper jets create a water barrier that blocks cooling fluid without requiring a physical mechanical component in contact with the roll, thereby eliminating the reliability issue of scraper replacement.
Solution Approach 2:
The mechanical scraper system is replaced with a fluid-based system. High-pressure scraper jets create a water curtain or water barrier that performs the blocking function previously achieved by mechanical contact, substituting mechanical action with hydrodynamic action to avoid thermal and mechanical constraints on a solid component.
2Object-affected harmful factors
If a mechanical scraper is used to prevent cooling fluid contact, then product contamination is avoided, but production stops occur due to frequent scraper replacement
Solution Approach 1:
The mechanical scraper that causes production interruptions is removed entirely. The system uses projected scraper jets to create a water barrier that prevents cooling fluid contact without requiring a physical component subject to wear and replacement, thereby enabling continuous operation.
Solution Approach 2:
The water barrier created by scraper jets provides continuous protection against cooling fluid contact throughout the rolling process. Since no mechanical scraper needs replacement, the useful action of preventing fluid contact continues uninterrupted, maintaining continuous rolling production.
3Temperature
If cooling jets are projected under pressure onto work rolls, then cooling effectiveness is improved, but cooling fluid may contact the metallic product
Solution Approach 1:
The cooling device is segmented into two distinct functional zones: cooling jets that contact the work roll for temperature control, and scraper jets that create a water barrier to prevent cooling fluid from reaching the metallic product. This segmentation allows both cooling effectiveness and fluid contact prevention to coexist.
Solution Approach 2:
The scraper jets create an intermediary water barrier between the cooling fluid and the metallic product. This water curtain acts as a mediator that allows cooling jets to effectively cool the work roll while preventing the cooling fluid from contacting and potentially contaminating the metallic product.
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 enhances the service life of the cooling device by preventing fluid contact with the metallic product, reducing the need for frequent replacements and maintaining continuous rolling operations while ensuring effective cooling of the work rolls.
Implementation Method 1
a cooling device projecting a plurality of cooling jets under pressure on at least one of said work roll
Implementation Method 2
cooling fluid comes into contact with the metallic product that is being rolled
Implementation Method 3
said scraper jets being oriented in the desired flow direction following a re-entrant angle towards the perpendicular to the surface of said work roll
Data Source
AI summary
The invention deals with a rolling mill (1) for metallic products comprising at least one pair of work rolls and at least one cooling device (2) projecting a plurality of cooling jets under pressure on at least one work roll, the cooling device projecting also at least one scraper jet between the cooling jets and the metallic product to be rolled, the scraper jets being oriented in the desired flow direction following a re-entrant angle towards the perpendicular to the surface of the work roll, as well as with a rolling process using said rolling mill (1).