Rolling Mill Balancing Cylinder Layout for Leak and Wear Reduction
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Solution Overview
Problem
Existing rolling mill designs face issues with leaks and high wear on seals and guide elements, particularly with tall mill ascending paths, leading to instability and increased costs due to complex and heavy component designs.
Innovation Solution
The design features a piston-cylinder system with a piston that protrudes beyond the cylinder housing at both ends, symmetrically arranged with a pull rod connecting the stand and balancing cross-members, and an integrated locking mechanism for enhanced stability and safety, reducing the load on seals and guide elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a classic hydraulic cylinder is arranged in the center of the cross-member, then the balancing function is achieved, but high forces occur on the cylinder seals resulting in leaks and high wear
Solution Approach 1:
The balancing system is divided into multiple piston-cylinder systems distributed at different locations on the cross-member rather than using a single central cylinder. This segmentation distributes the balancing force across multiple points, reducing the force concentration on any single cylinder seal and thereby improving seal reliability and reducing wear.
Solution Approach 2:
The piston-cylinder systems are configured to provide counterbalancing forces that offset the weight of the roller and material. By positioning multiple cylinders at different locations, the system creates a distributed counterweight effect that reduces peak forces on individual seals while maintaining overall balancing functionality.
2Strength
If the cylinder is arranged in the middle, then the balancing function is achieved, but high stresses occur in the stand cross-member requiring complex and heavy design
Solution Approach 1:
The cross-member is designed with multiple attachment points for piston-cylinder systems distributed across its structure. This segmented approach allows the balancing forces to be applied at multiple locations, distributing the stress across the cross-member rather than concentrating it at a single central point, thereby reducing the required complexity and weight of the cross-member design.
Solution Approach 2:
The piston-cylinder systems are arranged in a distributed pattern across the cross-member plane rather than concentrating force in one dimension. This spatial distribution across multiple dimensions reduces the stress concentration on any single section of the cross-member, allowing for a simpler and lighter structural design.
3Reliability
If classic plunger cylinders are used with pull rods, then the balancing function is achieved, but the locking mechanism is exposed requiring safety shielding
Solution Approach 1:
The locking mechanism is integrated into the piston-cylinder assembly itself rather than being a separate exposed component. The lock is combined with the cylinder structure, allowing it to be positioned within the cylinder housing or on protected surfaces, thereby eliminating the need for additional safety shielding while maintaining system stability.
Solution Approach 2:
The locking mechanism is nested within the cylinder housing structure, placing the lock inside or on the protected outer surface of the cylinder. This nesting arrangement protects the locking mechanism from exposure while maintaining its functional integrity for stabilizing the balancing system.
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
This configuration minimizes leaks and wear, extends component service life, improves stability, and reduces manufacturing costs while ensuring operational safety and ease of maintenance.
Implementation Method 1
at least one hydraulic piston-cylinder system is arranged in the stand cross-member, with which a tensile force can be generated between the stand cross-member and the balancing cross-member by means of the hydraulic piston-cylinder system
Data Source
AI summary
A rolling mill for rolling metal products, comprising two roller stands with a stand cross-member. A roller is rotatably mounted in the roller stands. The roller is operatively connected to a balancing cross-member, and at least one hydraulic piston-cylinder system is arranged in the stand cross-member, with which a tensile force can be generated between the stand cross-member and the balancing cross-member by the hydraulic piston-cylinder system. In order to prevent leakages in particular in the event of tall mill ascending paths, the piston-cylinder system has a cylinder housing with an upper axial end and a lower axial end. A piston is movably arranged in the cylinder housing, and the piston protrudes beyond the cylinder housing both at the upper axial end as well as at the lower axial end in each operating state.