Segmented Measuring Roll for Strip Tension
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Solution Overview
Problem
Conventional force measuring devices are inadequate for precisely measuring web tensions in longitudinally cut material webs, as they only provide measurements across the full web width, failing to offer detailed tension information for individual longitudinal strips, which is crucial for further processing in manufacturing and processing operations.
Innovation Solution
A force measuring device with a segmented measuring roll, where each measuring segment is equipped with a load cell and connected to an evaluation unit, allowing for the precise measurement of web tension fractions across multiple longitudinal strips, enabling the determination of total web tension for each strip by aggregating signals from individual load cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional force measuring device measures web tension across the full web width, then the measurement covers the entire material web, but it fails to provide detailed tension information for individual longitudinal strips
Solution Approach 1:
The measuring roll is divided into multiple measuring segments, with each segment equipped with its own load cell. This segmentation allows the device to measure web tension in individual longitudinal strips separately, providing detailed tension information for each strip while maintaining a manageable structural complexity through modular design
2Measurement precision
If the measuring roll is segmented with multiple load cells for each longitudinal strip, then precise web tension measurement for individual strips is achieved, but the device complexity increases
Solution Approach 1:
The measuring roll is divided into multiple measuring segments, with each segment equipped with its own load cell. This segmentation allows the device to measure web tension in individual longitudinal strips separately, providing detailed tension information for each strip while maintaining a manageable structural complexity through modular design
Solution Approach 2:
Each measuring segment is designed as a universal module that can measure tension for any longitudinal strip. The segments are arranged to accommodate different web configurations and strip arrangements, making the device adaptable to various measurement scenarios without requiring complete redesign
3Measurement precision
If measuring segments are arranged to cover full web width, then all longitudinal strips are measured, but some measuring segments may be wrapped around by multiple strips making individual measurement difficult
Solution Approach 1:
Each measuring segment is designed with specific dimensional characteristics suitable for its measurement position. The segments have optimized widths and positions that correspond to the expected strip widths and spacing, ensuring that each segment primarily interacts with a single longitudinal strip. This local optimization simplifies the assignment of measurements to specific strips
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 provides precise web tension measurements for individual longitudinal strips, enabling more accurate control of the winding process and reducing waste by identifying unsuitable tension conditions, thus improving processing efficiency and reducing material loss.
Implementation Method 1
each measuring segment includes a dedicated load cell for determining a web tension fraction of the longitudinal strip wrapped around the measuring segment
Implementation Method 2
When measuring the web tension, as a result of the application of force, the outer ring is displaced radially relative to the inner ring, and in this way, in the measuring section, tensions are produced that can be measured by means of strain gauges
Data Source
AI summary
The present invention relates to a force measuring device (10) for measuring the web tensions of a plurality of spaced apart longitudinal strips (5) of a longitudinally cut running material web that comprises a longitudinal direction defined by the running direction of the material web and a transverse direction, the force measuring device comprising an axle (12) and, supported on the axle, a measuring roll (20) wrapped around by the material web. Here, it is provided that the measuring roll is formed as a segmented measuring roll (20) having a plurality of measuring segments (22), the measuring segments (22) are arranged on the axle (12) in a respective measuring position, such that the spaced apart longitudinal strips (5) of the running material web wrap around in each case one or more measuring segments (22) and each measuring segment (22) is wrapped around by at most one longitudinal strip (5), each measuring segment (22) includes a dedicated load cell (26) for determining a web tension fraction of the longitudinal strip (5) wrapped around the measuring segment, the load cell providing a mount with which the measuring segment (22) sits on the axle (12), the force measuring device further comprising an evaluation unit (18) to which the measuring segments (22) are connected via electrical conductors and to which the measuring signals supplied by the load cells (26) in the measuring segments (22) are conductible, and the evaluation unit (18) comprising a web tension aggregation means (19) that is arranged and adapted to determine, for each longitudinal strip (5), from the web tension fractions that are determined by the load cells (26) of the measuring segments (22) wrapped around by said longitudinal strip (5), the total web tension of the longitudinal strip (5).