Modular Drive Straightening Unit for Continuous Casting
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Solution Overview
Problem
Existing multi-strand continuous casting plants face high maintenance and assembly challenges due to complex hydraulic systems and interdependent drive straightening units, requiring extensive disassembly and reassembly for roll changes.
Innovation Solution
The design features a modular drive straightening unit with a detachable crosshead, roller carriages, and automatic media supply systems, allowing for easy installation and removal of units as well as independent media coupling, reducing assembly complexity and enabling straightforward adjustment of rollers for precise strand guidance and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If drive straightening units are arranged in a common support structure with comb-like uprights, then multiple strands can be straightened simultaneously, but assembly and disassembly work increases significantly due to hydraulic cylinder detachment
Solution Approach 1:
The drive straightening unit is divided into modular components: the roller pair assembly can be independently removed from the crosshead, and the crosshead itself can be detached from the comb-like uprights. This segmentation allows maintenance workers to access and replace roller components without dismantling the entire straightening unit or detaching hydraulic cylinders from the fixed support structure.
Solution Approach 2:
The roller pair is extracted as a separate removable component from the crosshead assembly. The roller bearing housing can be detached and replaced independently, allowing maintenance of the rolling elements without affecting the crosshead or its connection to the uprights. This extraction principle simplifies maintenance by isolating the wear-prone roller components.
2Adaptability or versatility
If hydraulic adjusting cylinders are used to press rollers against the strand, then roller position can be adjusted for changing strand thicknesses, but maintenance complexity increases due to hydraulic system interdependencies
Solution Approach 1:
The hydraulic adjusting system is segmented into independent units, with each drive straightening unit having its own hydraulic cylinder mounted on the fixed crosshead. This allows the hydraulic system to be divided into independent zones, where maintenance or replacement of one cylinder does not affect others, reducing system interdependency complexity.
Solution Approach 2:
Instead of mounting the hydraulic cylinder on the moving roller assembly and detaching it during maintenance, the cylinder is invertedly mounted on the fixed crosshead structure. The piston rod connects to the movable roller bearing housing, reversing the traditional mounting approach. This inversion makes the cylinder a stationary component that remains installed during roller maintenance, simplifying the maintenance procedure.
3Device complexity
If roller pairs are fixed in position, then the structure is simpler, but adaptability to changing strand thicknesses is reduced
Solution Approach 1:
The roller positioning system incorporates dynamic adjustability through hydraulic cylinders that can modify the distance between rollers in real-time. The roller bearing housing is designed to move relative to the crosshead along guided paths, allowing continuous adjustment of roller position to accommodate varying strand thicknesses during the continuous casting process.
Solution Approach 2:
The system enables parameter changes in roller spacing and position through hydraulic actuation. By controlling the hydraulic cylinder extension/retraction, the roller separation distance can be dynamically adjusted to match different strand thickness requirements, providing adaptability without fundamentally changing the structural configuration.
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
The invention relates to a multi-strand continuous casting system for manufacturing metal strands having a billet-shaped or bloom-shaped cross section, with a strand guide that comprises an alignment zone containing drive alignment subassemblies, wherein a plurality of drive alignment subassemblies disposed one after the other in the strand guide direction in a common support frame with comb-like uprights in receptacle openings formed between the uprights, and wherein each drive alignment subassembly comprises a pair of rollers with an outer arch roller and a inner arch roller moving relative thereto in associated roller sleds and an activation device for one of the two rollers, and optionally a rotational drive for one of the rollers. To ensure ease of installation and removal in the event that rollers need to be replaced it is proposed that each drive alignment subassembly comprise a cross head that is detachably connected to the uprights that form a receptacle opening for the drive alignment subassembly, that the activation device is hinged at the cross head for the activatable inner arch roller, that each roller of the roller pair is supported in a roller sled and the two roller sleds are slidably guided in guides of the uprights and that the roller sled of the activatable inner arch roller is connected to the drive alignment subassembly.