Continuous Band Fabric Changing Device for Paper Machines
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Solution Overview
Problem
Existing fabric-changing devices in paper machines have a large number of separate parts, leading to time-consuming assembly, high maintenance costs, and reduced reliability due to uneven pressure distribution on the fabric.
Innovation Solution
A device with a minimal number of parts, utilizing a pressure medium between a pressure chamber and a band to apply even pressure on the fabric, reducing the number of parts and improving reliability by using a caterpillar track with a small gap for pressure application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a set of rollers is used as a fabric-pulling device, then the fabric can be pulled through the gap, but the device comprises a very large number of separate parts leading to time-consuming assembly and high maintenance costs
Solution Approach 1:
The patent merges multiple individual rollers into a single continuous band that functions as the fabric-pulling device. This band replaces the traditional set of rollers, reducing the number of separate parts from thousands to just one continuous component, thereby simplifying assembly and maintenance while maintaining the fabric pulling capability
Solution Approach 2:
The continuous band serves multiple functions simultaneously: it acts as the fabric-pulling device, provides pressure distribution through its contact surface, and eliminates the need for multiple individual roller components. This multi-functionality reduces device complexity while maintaining operational effectiveness
2Ease of operation
If a set of rollers is used as a fabric-pulling device, then the fabric can be pulled through the gap, but maintenance is expensive
Solution Approach 1:
By combining multiple rollers into a single continuous band, the patent reduces the number of components that require maintenance. Instead of maintaining thousands of individual roller parts, only the single continuous band needs maintenance, significantly reducing maintenance costs and complexity
Solution Approach 2:
The continuous band is designed as a simpler, more durable component that can be easily replaced when worn, rather than maintaining complex assemblies of individual rollers. This approach reduces long-term maintenance costs by eliminating the need for expensive repairs of multiple precision roller components
3Ease of operation
If a set of rollers is used as a fabric-pulling device, then the fabric can be pulled through the gap, but the large number of parts reduces the reliability of operation
Solution Approach 1:
The patent improves reliability by merging thousands of individual roller parts into a single continuous band. This eliminates the potential failure points associated with multiple separate components, bearings, and connections, resulting in a more reliable fabric-pulling device with fewer opportunities for mechanical failure
4Ease of manufacture
If a caterpillar track is used with short pieces, then the structure can be assembled, but a small gap remains between pieces where pressure on the fabric is zero causing uneven pressure distribution
Solution Approach 1:
The patent eliminates the gaps between segments by using a continuous band instead of segmented caterpillar tracks. This continuous structure ensures uniform pressure distribution across the entire fabric contact surface, eliminating the zero-pressure gaps that occur between individual track pieces
Solution Approach 2:
The continuous band provides homogeneous pressure distribution across the fabric surface, eliminating the non-uniform pressure zones created by gaps between segmented track pieces. This homogeneity ensures consistent fabric handling and processing
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 simplifies assembly and maintenance while ensuring consistent pressure on the fabric, enhancing operational reliability and reducing the risk of fabric damage during changes.
Implementation Method 1
a pressure medium between a pressure chamber and a band of the device applies a very even pressure to a fabric passing between bands
Data Source
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AI summary
The device comprises two units placed one on top of the other, each unit comprising a first side frame (101), a second side frame (102) spaced from the first side frame, and a band (130) running between the side frames (101, 102). Each unit (100, 200) additionally comprises a pressure chamber (300) attached to the side frames (101, 102) and positioned in a sealed manner against the inner surface of the band (130).