Deflection Controlled Roll End-Section Attachment
Solution Overview
Problem
Deflection controlled rolls with existing oil removal devices tend to become misaligned due to bending under load, leading to ineffective oil scraping and potential detachment of the liquid return attachment.
Innovation Solution
A deflection controlled roll design where the liquid return's doctor blade is attached only at its end sections, ensuring it remains aligned with the roll's inner circumference, independent of carrier deflection, and is secured via an oil return box that prevents bending under load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the liquid return is attached along its entire length to the carrier, then the attachment is secure, but the doctor blade becomes misaligned when the carrier bends under load
Solution Approach 1:
The liquid return is attached to the carrier only at its end sections rather than along its entire length. This segmentation of the attachment points allows the central portion of the liquid return to remain independent and maintain its alignment with the roll's inner circumference even when the carrier deflects under load.
2Adaptability or versatility
If the carrier is allowed to bend under load, then the roll can accommodate operational forces, but the doctor blade geometry relative to the roll shell changes
Solution Approach 1:
By attaching the liquid return only at the end sections of the carrier, the design separates the carrier's bending function from the doctor blade's alignment function. The end sections provide attachment security while the central unattached portion maintains consistent geometry with the roll shell regardless of carrier deflection.
3Device complexity
If the squeegee is rigidly fixed to the carrier, then the structure is simple, but the squeegee cannot maintain proper alignment with the roll inner circumference during carrier deflection
Solution Approach 1:
The squeegee attachment is segmented to contact only the end sections of the carrier, creating a pinned connection rather than a rigid fixed connection. This allows the squeegee to remain in the neutral phase of the roller and maintain proper alignment with the inner circumference of the roll shell while the carrier bends under load.
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 solution maintains consistent geometry between the carrier and roll shell, ensuring effective oil scraping and reliable attachment, even when the carrier bends, preventing misalignment and detachment issues.
Implementation Method 1
The support on the inner circumference 4 of the roll shell 2 is hydrostatic. The bearing arrangement 6 preferably comprises individual bearing elements arranged axially next to one another along the length of the roll, each of which has a radially movable force element 7 for transmitting controllable element pressures to the inner peripheral surface 4 of the roll shell 2.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The roll (1) has a fixed support (3) penetrating into a rotatable roller sleeve (2), and a hydraulic bearing arrangement (6) between the support and the sleeve that are hydrostatically held at the internal periphery (4) of the bearing arrangement. A fluid recirculation unit (9) is arranged on the support and has a blade (10) adjacent to the internal periphery of the bearing arrangement. An oil recycling chamber accommodates the recycled fluid, where the fluid recirculation unit is arranged at the support over an attachment point (12) and on an axial end section of the support.