Rolling Mill Power Transmission With Dynamic Intermediate Rotors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional rolling mills face challenges in changing the center-to-center distance of mill rolls for varying plate thickness and maintenance, which restricts the inclination angle and transmission torque of shaft couplings, leading to increased vibration, installation area, and costs.
Innovation Solution
A power transmission device with a first and second power transmission path, each including a first intermediate rotor with a fixed axial center, a second intermediate rotor moving along the outer circumference of the first, and a driving shaft that moves perpendicular to its axial center, allowing for efficient torque transmission while minimizing contact area and coupling extension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shaft couplings are extended to reduce inclination angle, then transmission reliability is improved, but device complexity and installation area increase
Solution Approach 1:
The driving shaft is designed to move dynamically in the vertical direction to follow the movement of intermediate rotors, rather than using a fixed extended shaft coupling. This dynamic adjustment allows the shaft to maintain proper alignment without requiring extended length, thus improving reliability while avoiding increased complexity
Solution Approach 2:
Intermediate rotors are introduced as mediators between the motor output shaft and the driving shaft. These intermediate rotors transmit torque while allowing for distance and alignment adjustments, eliminating the need for extended shaft couplings and reducing overall device complexity
2Adaptability or versatility
If shaft couplings are extended to follow inter-axial distance changes, then adaptability is improved, but contact area increases leading to higher friction
Solution Approach 1:
Intermediate rotors serve as mediators that can move along the outer circumference of each other, providing adaptability to inter-axial distance changes without requiring extended shaft couplings. This reduces the contact area and associated friction losses
Solution Approach 2:
The driving shaft is given freedom to move in the vertical dimension to follow intermediate rotor movement, rather than extending horizontally. This dimensional change allows adaptability while minimizing contact area and friction
3Reliability
If shaft couplings are extended to reduce inclination angle, then transmission efficiency is improved, but manufacturing cost increases
Solution Approach 1:
Instead of manufacturing extended shaft couplings, the system uses a dynamic configuration where the driving shaft moves vertically to follow intermediate rotor positions. This eliminates the need for costly extended components while maintaining transmission efficiency
Solution Approach 2:
Intermediate rotors are used as cost-effective mediators that enable proper torque transmission without requiring expensive extended shaft couplings, thus improving transmission efficiency while reducing manufacturing costs
Data Source
AI summary
A power transmission device includes a first power transmission path for transmitting a driving force of a motor to one driven shaft, and a second power transmission path for transmitting the driving force of the motor to another driven shaft. At least one of the first power transmission path or the second power transmission path includes a first intermediate rotor fixed to an output shaft of the motor, a second intermediate rotor rotated by the first intermediate rotor and moving arcuately along an outer circumference of the first intermediate rotor, a driving shaft rotated by the second intermediate rotor and transmitting the driving force to the one driven shaft or the another driven shaft. The driving shaft is configured to move in a direction perpendicular to an axial center direction of the driving shaft in accordance with movement of the second intermediate rotor around the first intermediate rotor.