Rolling Mill Power Transmission Path for Variable Roll Distance
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Solution Overview
Problem
Conventional power transmission devices in rolling mills face challenges in maintaining torque transmission efficiency while minimizing contact area and vibration, especially when changing the inter-axial distance of mill rolls, leading to increased costs and potential breakage due to restricted inclination angles and torque limitations.
Innovation Solution
A power transmission device configuration featuring a second intermediate rotor moving along the outer circumference of a first intermediate rotor, allowing the driving shaft to move perpendicular to the axial center, which suppresses misalignment and extends the engagement surface area, reducing the diameter of shaft couplings and enhancing load capacity, and includes a circular arc movement trajectory to ensure smooth power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shaft couplings are extended to transmit torque at small inclination angles, then torque transmission reliability is improved, but vibration and installation area increase
Solution Approach 1:
The intermediate rotor is designed to dynamically adjust its position along the input shaft axis, enabling the system to adapt to varying inter-axial distances and inclination angles. This dynamic adjustment allows the shaft coupling to maintain reliable torque transmission without requiring excessive extension, thereby reducing vibration and installation area while preserving torque transmission reliability.
2Reliability
If shaft couplings are extended to transmit torque at small inclination angles, then torque transmission reliability is improved, but installation area increases
Solution Approach 1:
The intermediate rotor's dynamic positioning capability allows the shaft coupling to accommodate variable inter-axial distances without requiring a fixed extended configuration. This reduces the installation area while maintaining torque transmission reliability across different operational conditions.
Solution Approach 2:
The system changes the axial position parameter of the intermediate rotor to adapt to different inter-axial distances and inclination angles. By varying this parameter, the shaft coupling achieves reliable torque transmission without requiring a larger installation area, as the adjustment is achieved through linear displacement rather than radial expansion.
3Ease of manufacture
If conventional shaft couplings are used with fixed inter-axial distance, then manufacturing simplicity is maintained, but adaptability to changing mill roll distances is limited
Solution Approach 1:
The intermediate rotor is designed with dynamic adjustability along the input shaft axis, allowing the shaft coupling to adapt to changing inter-axial distances between mill rolls. This dynamic feature provides versatility while maintaining a relatively simple manufacturing process, as the adjustment mechanism is integrated into the existing coupling structure without requiring complex multi-component assemblies.
4Power
If the engagement surface area between driving and driven shafts is increased, then torque transmission efficiency is improved, but the diameter of shaft couplings must increase
Solution Approach 1:
The invention resolves this contradiction by changing the dimension in which the engagement surface area is increased. Instead of increasing the diameter (radial dimension) of the shaft coupling, the engagement surface area is expanded along the axial dimension through the intermediate rotor's movement capability. This allows higher torque transmission efficiency to be achieved by extending the contact length axially rather than radially, thus maintaining a compact shaft coupling diameter while improving power transmission.
Data Source
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AI summary
Provided is a power transmission device including: 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 disposed so as to be opposed to said one driven shaft. At least one of the first power transmission path and the second power transmission path includes: a first intermediate rotating body of which the axis position is fixed with respect to an output shaft of the motor and that is rotated by the driving force of the motor; a second intermediate rotating body that is rotated by the first intermediate rotating body and that is moved in an arc along an outer circumference of the first intermediate rotating body; and a drive shaft that is rotated by the second intermediate rotating body and that transmits the driving force to said one or said other driven shaft. The drive shaft is configured so as to move in a direction perpendicular to the axial direction of the drive shaft in accordance with movement of the second intermediate rotating body around the first intermediate rotating body.