Continuous Press Heating Lines on Sliding Bearings for Thermal Expansion
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Solution Overview
Problem
The linear expansion of heatable pressure plates in continuous wood-based panel presses causes issues with heat transfer medium supply and removal, leading to hose stress, potential breakage, and contamination from wood chips, especially when installation space is limited.
Innovation Solution
Supporting heat transfer medium inlet and outlet lines on plain bearings allows them to expand with the pressure plates, minimizing shifting and enabling unhindered expansion, while arranging lines under the floor independent of the frame allows for chip collection without contaminating the area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hoses are used to accommodate thermal expansion of pressure plates, then expansion movements can be absorbed, but the hoses become stiff and inflexible requiring large loops that take up installation space
Solution Approach 1:
The patent replaces the mechanical hose connection system with a sliding bearing guide system. The supply and discharge lines are guided by sliding bearings that allow longitudinal expansion movements while maintaining a fixed transverse position, eliminating the need for flexible hoses and large expansion loops.
Solution Approach 2:
The sliding bearing acts as an intermediary between the pressure plates and the supply/discharge lines. It mediates the thermal expansion by allowing longitudinal movement while constraining transverse movement, enabling the lines to expand with the plates without requiring flexible connections.
2Area of stationary object
If hose lengths are chosen short to save space, then installation space is reduced, but hoses become stressed during start-up and cooling and may break or become leaky
Solution Approach 1:
The patent eliminates the hose mechanical connection system and replaces it with a sliding bearing-guided rigid line system. This substitution removes the stress concentration points that occur in hoses during thermal cycling, preventing breaks and leaks while maintaining compact installation.
3Ease of manufacture
If lines are attached to the press frame without sliding bearings, then installation is simplified, but thermal expansion causes significant displacement of pressure plate connections relative to line connections
Solution Approach 1:
The sliding bearing serves as an intermediary that decouples the thermal expansion of pressure plates from the supply/discharge lines. It allows the lines to move longitudinally with the plates while maintaining precise transverse alignment, eliminating relative displacement between connections.
Solution Approach 2:
The patent changes the movement parameters of the supply and discharge lines by guiding them on sliding bearings. This allows the lines to undergo longitudinal displacement matching the pressure plate expansion while maintaining fixed transverse position, preserving connection alignment.
4Productivity
If pressure plates are heated to high temperatures for efficient drying, then drying performance improves, but thermal expansion increases and causes greater displacement and stress
Solution Approach 1:
The patent replaces the flexible hose system with a sliding bearing-guided system that can accommodate the increased thermal expansion at high temperatures without stress. The sliding bearings allow the supply and discharge lines to expand freely along with the pressure plates, preventing stress concentration even at elevated temperatures.
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 solution reduces hose stress, prevents breakage, and creates space for maintenance and chip collection, preventing wood particle ignition and ensuring uniform panel density by synchronizing line and plate expansion.
Implementation Method 1
the heat transfer medium in the supply and/or return lines and in the pressure plates exhibits only a small temperature difference. Because the lines are supported and guided by a sliding bearing, they can expand in the same way as the pressure plates.
Implementation Method 2
the wood fiber material is continuously compressed into a wood-based panel. They are usually guided over rollers, which in turn rest on pressure plates that are at least partially heated.
Data Source
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AI summary
The invention relates to a continuous press for the production of wood-based panels, the press having an upper belt (3) and a lower belt (4) rotating with the formation of a press gap (5) which, with the aid of at least partially heatable pressure plates, are and discharge lines (11, 24.1, 24.2, 25.1, 25.2) can be supplied with a heat transfer medium and can be pressed against a mat made of a wood fiber material, in that at least part of the pressure plates (7, 8) are supported by actuators ( 9) can be pressurized. In order to get a better grip on the problem of thermal expansion and the line routing for the heat transfer medium, it is provided that at least one inlet and/or outlet line (11, 24.1, 24.2, 25.1, 25.2) for the heat transfer medium running in the longitudinal direction of the press Heating of the pressure plates (7, 8) is supported on plain bearings (28).