Inductive Foil Detector Damping Thresholds
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Solution Overview
Problem
In the manufacturing of accumulators, existing technologies face challenges in accurately detecting the number of foils using inductive sensors, leading to undefined situations during automated production, particularly when one or multiple foils stick together, which is critical for high quantities and low costs.
Innovation Solution
An inductive foil detector with an oscillating circuit generating an electromagnetic alternating field, causing eddy currents in foils, and an evaluation device that determines damping thresholds to differentiate between the presence of one, two, or no foils, outputting digital signals for easy processing by a programmable logic controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inductive sensors are used to detect the number of foils, then foil detection is possible, but accurate determination of the number of foils is difficult leading to undefined situations
Solution Approach 1:
The patent changes the evaluation parameters by introducing multiple threshold values (first threshold, second threshold) for damping values. Instead of using a single threshold, the system compares damping values against multiple thresholds to accurately determine the number of foils. This parameter change enables reliable distinction between one foil, multiple foils, and no foil scenarios, resolving the measurement precision and reliability contradiction.
2Measurement precision
If analog measurement signals are used for foil detection, then foil presence can be detected, but evaluation and further processing is complex and expensive
Solution Approach 1:
The patent transforms the complex analog measurement evaluation into a simple digital threshold comparison system. By changing from continuous analog signal processing to discrete digital threshold comparisons (comparing damping values against first and second thresholds), the system achieves accurate foil counting with minimal computational complexity. This parameter change from analog to digital evaluation methodology resolves the contradiction between detection capability and system complexity.
Solution Approach 2:
The patent replaces complex analog signal processing mechanisms with a simpler digital evaluation approach. Instead of using expensive analog cards for signal evaluation, the system uses a programmable logic controller with digital threshold comparisons. This substitution of evaluation methodology reduces device complexity while maintaining detection precision.
3Ease of operation
If vacuum gripper bends the film to detach second film, then single film gripping is improved, but additional mechanical complexity is introduced
Solution Approach 1:
The patent replaces mechanical bending mechanisms with an inductive detection system. Instead of relying on mechanical bending to detach films, the system uses electromagnetic induction to detect the number of foils gripped. The oscillating circuit generates an electromagnetic field that interacts with the conductive layers of the foils, providing non-contact detection. This substitution eliminates the need for complex mechanical bending mechanisms while achieving the same operational goal.
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 simple and inexpensive evaluation of foil detection, preventing incorrect accumulator assembly by accurately determining the number of foils, ensuring proper handling and reducing errors in automated production lines.
Implementation Method 1
An inductive foil detector according to the invention has an oscillating circuit for generating an electromagnetic alternating field. If there is a foil with a metallic layer in this electromagnetic alternating field generated by the oscillating circuit, then an eddy current is excited in this foil by the electromagnetic alternating field of the oscillating circuit
Implementation Method 2
an eddy current is excited in this foil by the electromagnetic alternating field of the oscillating circuit, which in turn causes a field that opposes the exciting electromagnetic alternating field of the oscillating circuit. The oscillating circuit is accordingly damped by the presence of the foil
Data Source
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AI summary
An inductive film detector for detecting the number of adjacent films, comprising a resonant circuit for generating an alternating electromagnetic field and an evaluation device for determining the damping of the resonant circuit, configured such that, upon exceeding a first predetermined damping threshold, it assumes the presence of a single film at a predetermined detection distance; upon falling below the first threshold, it assumes the presence of two films at the predetermined detection distance; and upon falling below a second predetermined threshold, which is smaller than the first threshold, it assumes a state without any film at the detection distance. The invention further relates to a method for determining the number of adjacent films.