Double Pressing Unit Lever Mechanism
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Solution Overview
Problem
Existing paper machines with press units comprising pivotable press and counter-press rolls face issues with maintaining an exact operating position without constant force and require complex locking mechanisms.
Innovation Solution
A double press unit with a pivotable shoe press roller, where the press roller is mounted on a bearing lever and adjusted by an external lever system, eliminating the need for internal support sources and allowing for variable pressing pressure and compensation for counter-roll deformations due to temperature fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is used to maintain the operating position, then the position stability is improved, but the device complexity increases
Solution Approach 1:
The press roller assembly automatically maintains its operating position through the bearing lever's mechanical configuration and the natural pressing force between rollers, eliminating the need for external locking mechanisms. The system serves itself by using the operational force to maintain position stability.
Solution Approach 2:
The locking mechanism is completely removed from the system. Instead of adding a locking device to maintain position, the invention extracts this function entirely by designing the bearing lever and adjusting unit to inherently maintain the operating position through mechanical advantage and force balance.
2Reliability
If constant force is applied to the adjusting unit, then the operating position is maintained, but the energy consumption increases
Solution Approach 1:
The adjusting unit operates periodically only when position adjustment is needed, rather than applying constant force. The mechanical design allows the system to hold position without active force application, using gravity and mechanical advantage to maintain equilibrium between adjustments.
Solution Approach 2:
The system uses the natural pressing force between the press roller and counter-press roller, combined with the bearing lever's mechanical configuration, to automatically maintain the operating position without requiring continuous energy input or constant force application.
3Reliability
If a complex locking mechanism is used, then the position stability is improved, but the manufacturing cost increases
Solution Approach 1:
The locking mechanism is completely removed from the system. Instead of adding a locking device to maintain position, the invention extracts this function entirely by designing the bearing lever and adjusting unit to inherently maintain the operating position through mechanical advantage and force balance, thereby reducing manufacturing cost.
Solution Approach 2:
The bearing lever and adjusting unit serve multiple functions: they enable position adjustment, maintain operating position, and provide the necessary mechanical advantage for pressing operations. This multi-functionality eliminates the need for separate locking components, simplifying manufacturing.
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
Ensures consistent pressing pressure without deformation and reduces the need for complex locking mechanisms, leading to cost savings and improved operational efficiency.
Implementation Method 1
the press roller is mounted on a pivotable bearing lever and is movable between an operating position, in which the press roller is pressed against the counter-press roller, and an out-of-service position, in which the press roller is not pressed against the counter-press roll, by means of at least one adjusting unit acting on the bearing lever
Implementation Method 2
If several individually mounted support elements are provided, these can have different hardnesses, particularly at their two edges, in edge zones to improve the contact pressure of the pressure shoe against the counter-pressure roller
Data Source
Figure 1~3
AI summary
The invention relates to a machine for manufacturing or processing a material web (9), in particular a paper, cardboard, or tissue web, said machine comprising a pressing unit having a press roll (1) and a counter-press roll (8), wherein the press roll (1) is mounted on a pivotable mounting lever (12) and can be moved by means of at least one adjusting unit (14) between an operating position in which the press roll (1) is pressed against the counter-press roll (8) and an inoperative position in which the press roll (1) is not pressed against the counter-press roll (8), characterised in that the pressing unit is a double pressing unit and the press roll (1) mounted on the pivotable mounting lever (12) is arranged as a second press roll (1) in the web running direction of the material web (9).