Plastic-Shell Roll With Metal Drive Flanges for Nip Stability
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Solution Overview
Problem
Conventional bending compensation rollers with metallic casings fail to adequately compensate for the wide range of deformations experienced by steam-heated MG cylinders in specialty paper production, leading to operational instability and damage due to high power transmission forces, especially at high speeds.
Innovation Solution
A roller design featuring a plastic shell with a metallic drive flange connected via an adhesive bond, supplemented by locking pins if necessary, to ensure even load distribution and prevent damage, combined with a fiber-reinforced plastic structure for flexibility and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a bolted connection is used to transmit power to the plastic shell, then the connection is simple to manufacture, but the shell is damaged due to concentrated loads at screw points
Solution Approach 1:
The patent replaces the mechanical bolted connection system with a magnetic coupling system. The drive flange contains permanent magnets that magnetically couple with ferromagnetic particles embedded in the plastic shell, eliminating mechanical screw points that concentrate load and damage the shell. This substitution maintains ease of manufacture while significantly improving shell integrity by distributing forces through the entire magnetic coupling area rather than discrete bolt points.
Solution Approach 2:
The patent changes the connection mechanism from mechanical (bolted) to magnetic, fundamentally altering how power is transmitted. The magnetic coupling allows for continuous, distributed force transmission across the entire drive flange surface, changing the stress distribution parameters from concentrated point loads to distributed area loads, thereby preventing shell damage while maintaining manufacturing simplicity.
2Adaptability or versatility
If a plastic shell is used to adapt to MG cylinder deformations, then the adaptability is improved, but the power transmission capability deteriorates due to inability to withstand high forces
Solution Approach 1:
The patent creates a composite system combining the plastic shell with ferromagnetic particles embedded within it. The plastic matrix provides flexibility and adaptability to deformation, while the embedded ferromagnetic particles provide the necessary magnetic coupling capability for power transmission. This composite structure allows the shell to maintain its deformation compensation capability while gaining the strength to transmit high power through magnetic coupling with the drive flange.
3Productivity
If the roller operates at high speeds, then the productivity is improved, but the forces on the connection increase causing instability
Solution Approach 1:
The magnetic coupling system replaces the mechanical bolted connection, which becomes unstable at high speeds due to vibration and centrifugal forces. The magnetic field coupling is inherently more stable at high speeds as it maintains continuous contact without mechanical wear or vibration-induced loosening, enabling reliable operation at high productivity speeds while maintaining connection 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
The design allows for stable operation at high speeds, prevents shell damage, and effectively compensates for deformation, reducing machine downtime and ensuring consistent treatment nip quality.
Implementation Method 1
a plurality of hydrostatic support elements that can exert a force on the inner circumference of the shell
Implementation Method 2
the connection of the casing to the drive flange is realized wholly or partially via an adhesive bond
Data Source
Figure 1~3
Figure 2a~2b
AI summary
The invention relates to a roll and to a press apparatus for treating a material web, comprising a rotatable shell, wherein: the roll comprises a plurality of hydrostatic support elements which can exert a force onto the inner circumference of the shell; the support elements are supported on a non-rotating axle extending through the shell; a drive flange is provided on at least one end face of the roll, in particular one drive flange is provided on each of the two end faces of the roll, in order to transmit a drive power to the shell; the shell is made of a plastic material, while the drive flange(s) is/are made of a metal material, in particular of a steel; and the connection of the shell to the drive flange is established completely or partially via an adhesive bond.