Strapping Device With Pivot-Integrated Force Measurement
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Solution Overview
Problem
Existing strapping devices lack precise measurement of tension force during the strapping process, leading to inadequate securing of goods with high elasticity or low stiffness, especially during the tensioning process.
Innovation Solution
A strapping device with a drive and tensioning unit connected to a closure unit via a pivot bearing and a connecting element equipped with a measuring element, allowing for precise measurement of tensioning force by orienting the measuring element tangentially to the pivot point, using a load cell or similar sensors to ensure linear force measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If indirect equivalent values are used to control tensile force, then the device complexity is reduced, but the measurement precision of tension force deteriorates
Solution Approach 1:
The patent replaces indirect mechanical control methods (current consumption monitoring) with direct force measurement using a load cell. The load cell is integrated into the connecting element between the drive and tensioning unit and the closure unit, providing direct measurement of the actual tensioning force applied to the strapping band, thereby achieving precise force measurement without complex indirect control systems.
2Device complexity
If tensioning force is not precisely measured, then the device complexity is reduced, but the reliability of securing goods deteriorates
Solution Approach 1:
The patent implements a feedback control system where the load cell continuously measures the actual tensioning force and this measurement is used to control the drive motor. The system compares the measured force with the desired force and adjusts the motor operation accordingly, ensuring that the correct tensioning force is consistently applied to secure goods reliably, even for elastic or low-stiffness materials.
3Measurement precision
If the measuring element is oriented linearly with the force vector, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent integrates the load cell directly into the connecting element that serves multiple functions: it connects the drive and tensioning unit to the closure unit, transmits mechanical forces, and simultaneously measures the tensioning force. This multi-functional design achieves precise linear force measurement without adding separate measurement components, thereby avoiding increased device complexity.
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
Enables precise and constant tensioning force measurement, compensating for material differences and maintaining tension despite compressions or changes in the goods being strapped, ensuring secure bundling.
Implementation Method 1
the connecting element is equipped with a measuring element for measuring the tensioning force
Implementation Method 2
The measuring element is preferably designed as a load cell. Other measuring element designs, such as piezoelectric force sensors, Hall sensors, or capacitive sensors, are also possible.
Implementation Method 3
With plastic strapping, the ends are generally joined by welding, for example, friction welding.
Data Source
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AI summary
The present invention relates to a strapping device having at least one drive and tensioning unit (2) and a closure unit (3) for connecting the strap ends of a strapping band (7) wrapped around a product. Furthermore, the at least one drive and tensioning unit (2) is connected to the closure unit (3). According to the invention, the drive and tensioning unit (2) is rotatably connected to the closure unit (3) and is supported on the closure unit (3) with the interposition of a connecting element (4) equipped with a measuring element for tensioning force.