20-High Rolling Mill Split Housing With Sealed Maintenance Door
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Solution Overview
Problem
20-high rolling mills with one-piece housing face challenges during maintenance due to limited access and oil leakage issues, while 'split housing' mills have compatibility problems with intensive lubrication requirements.
Innovation Solution
A 20-high rolling mill design with a two-part housing system, featuring a door that seals with a peripheral frame and axial stops for intermediate rolls, allowing for improved access and lubrication while maintaining a fluid-tight seal, using hydraulic clamping and lubrication systems to accommodate vertical movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a one-piece housing is used in a 20-high rolling mill, then the structure is simple and rigid, but maintenance access is limited and requires opening a large door which causes oil leakage
Solution Approach 1:
The housing is divided into a fixed part and a movable part that can displace vertically relative to each other. This segmentation allows the movable housing part to open upward, providing wide maintenance access to all rolls and backup roller assemblies without requiring a large hinged door, thus resolving the contradiction between structural simplicity and maintenance accessibility.
2Ease of operation
If a large hinged door is used for maintenance access, then all rolls can be accessed, but oil spray leakage occurs during rolling operations
Solution Approach 1:
By dividing the housing into fixed and movable parts with a vertical displacement mechanism, the invention eliminates the need for a large hinged door. The movable part opens upward to provide access during maintenance, then closes to form a sealed environment during rolling operations, preventing oil spray leakage while maintaining ease of access.
Solution Approach 2:
A sealing arrangement is provided between the fixed and movable housing parts to prevent oil leakage. This intermediary sealing mechanism allows the movable part to displace vertically while maintaining a fluid-tight seal, thus resolving the contradiction between maintenance access and oil leakage prevention.
3Ease of repair
If a split housing with movable parts is used, then maintenance access is improved, but compatibility with intensive lubrication requirements is compromised
Solution Approach 1:
The housing is segmented into fixed and movable parts that maintain relative vertical positioning during rolling operations. This segmentation provides improved maintenance access while the controlled displacement mechanism and sealing arrangement ensure compatibility with intensive lubrication requirements by preventing oil leakage.
Solution Approach 2:
A sealing arrangement acts as an intermediary between the fixed and movable housing parts, allowing vertical displacement for maintenance access while maintaining a fluid-tight seal during rolling operations with intensive lubrication, thus resolving the contradiction between ease of repair and lubrication compatibility.
4Ease of repair
If the housing is opened for maintenance, then access to rolls is improved, but the seal impervious to lubricating oil is compromised
Solution Approach 1:
The housing is divided into fixed and movable parts that can separate vertically for maintenance access. The segmentation allows the movable part to open upward to expose all rolls and backup roller assemblies, then close to restore the sealed environment, thus improving maintenance access while maintaining seal integrity.
Solution Approach 2:
A sealing arrangement serves as an intermediary between the fixed and movable housing parts, maintaining a fluid-tight seal during rolling operations. The seal allows controlled vertical displacement for maintenance access while preventing oil leakage when the housing is closed, resolving the contradiction between ease of repair and seal integrity.
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
Enhances maintenance accessibility and reduces oil leakage by ensuring a sealed environment during rolling operations, allowing for effective lubrication of bearing housings and improved operational efficiency.
Implementation Method 1
a hydraulic clamping mechanism configured to switch the housing system from a housing-open position, in which the upper housing part and the lower housing part are spaced apart from one another, into a clamping position, in which the upper housing part and the lower housing part are moved towards one another
Data Source
AI summary
A 20-high rolling mill configured for rolling a metal strip, which includes a housing system comprising two parts capable of moving relative to one another, respectively forming an upper housing part, configured to transmit a clamping force to the four backup roller assemblies, of the upper group, and an upper housing part, configured to transmit a clamping force to the four backup roller assemblies of the lower group, and a door cooperating, in a closed position, with a peripheral frame of a fixed frame structure of the housing system surrounding the maintenance window, said door closing, in a sealed manner, said maintenance window. A system of axial stops for the second intermediate rolls accompanies the movements of the upper and lower housing parts.