Suction Roll Sealing Strip Lubrication System
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Solution Overview
Problem
Sealing installations in suctioned or blown rollers for paper, cardboard, or tissue machines face challenges in reliably sealing positive-pressure or negative-pressure zones while minimizing wear and ensuring adequate lubrication for sealing strips, often resulting in excessive lubricant usage and rehumidification of fibrous webs.
Innovation Solution
A roller design with a movable sealing strip featuring a lubricant supply line that includes a flexural portion to allow radial movement and a lubricant channel on the upper side of the sealing strip, ensuring targeted lubrication without restricting the sealing strip's freedom of movement, and a lubricant channel that forms a reservoir to maintain a uniform lubricant level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lubricant is applied to the inner side of the roller sleeve and conveyed by rotation to sealing strips, then lubrication is provided to sealing strips, but the supply of lubricant decreases from one sealing strip to the next and excessive lubricant must be used
Solution Approach 1:
The lubricant supply system is segmented into individual channels for each sealing strip. Each sealing strip has its own lubricant channel that directly supplies lubricant to its sealing face, eliminating the gradual depletion problem of the conventional single supply system and reducing overall lubricant consumption.
Solution Approach 2:
Lubricant is supplied locally to each sealing strip's sealing face through dedicated channels. This ensures that each sealing strip receives adequate lubrication at its specific location without requiring excessive lubricant to be conveyed through the entire roller surface.
2Reliability
If a supply line is integrated into the sealing strip to provide targeted lubrication, then adequate lubricant supply is achieved, but the freedom of movement of the sealing strip in the radial direction is hampered
Solution Approach 1:
The supply line is constructed as a flexible element that can accommodate the radial movement of the sealing strip. The flexible supply line maintains its connection while allowing the sealing strip to move freely in the radial direction, preserving both lubrication supply and operational freedom.
Solution Approach 2:
The supply line is designed with dynamic characteristics that allow it to adapt to the movement of the sealing strip. The flexible construction enables the supply line to bend and deform as needed, maintaining functional connection while allowing radial displacement of the sealing strip.
3Reliability
If a rigid supply line is used to ensure stable lubricant delivery, then lubricant supply is reliable, but the sealing strip cannot move freely in the radial direction
Solution Approach 1:
The supply line uses flexible materials that can bend and deform elastically. This flexibility allows the supply line to maintain stable lubricant delivery while accommodating the radial movement of the sealing strip, resolving the contradiction between stability and freedom of movement.
Solution Approach 2:
The supply line's physical parameters (flexibility, elasticity) are specifically designed to allow deformation within certain limits. This enables the supply line to adapt its shape during radial movement while maintaining sufficient structural integrity for reliable lubricant delivery.
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
This design ensures consistent lubrication for all sealing strips, reduces lubricant usage, and enhances maintenance by allowing flexible connection and disconnection of the supply line, while preventing abrasion and maintaining reliable sealing performance.
Implementation Method 1
a lubricant channel (4) which adjoins the sealing face (3)... configured so as to form a reservoir in which a uniform lubricant level arises
Implementation Method 2
configured so as to form a reservoir in which a uniform lubricant level arises
Implementation Method 3
the part of the supply line (12) which runs within the roller (8), on its length which is routed outside the sealing strip (1), includes a first and second line portion (21, 22), wherein the second line portion (22) is configured so as to be flexural
Implementation Method 4
the sealing strip, in the region of its sealing face which points toward the inner side of the movable roller sleeve, comprises at least one lubricant outlet opening which is connected to a supply line and by means of which lubricant is deliverable between the inner side of the roller sleeve and the sealing face
Data Source
AI summary
A roller has a movable roller sleeve and a positive-pressure or negative-pressure zone inside the roller sleeve. The zone is sealed outwardly by a sealing installation with at least one sealing strip. The sealing strip in the radial direction of the roller is movable from the roller toward the inner side and away therefrom and the sealing strip has a lubricant outlet opening connected to a supply line for delivering lubricant to between the inner side of the roller sleeve and the sealing face. The supply line includes one part running within the sealing strip and one part running outside the sealing strip but within the roller. The part of the supply line within the roller, on its length which is routed outside the sealing strip, includes a first portion that is longer than a second line portion. The second line portion is more flexural than the first line portion.