Alternating Sensor Activation for Container Foreign Body Detection
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Solution Overview
Problem
Existing metal detectors for intermittently operated bottle lines in packaging machines are unsuitable, costly, and prone to inaccuracies due to sensor interference, making reliable detection of foreign bodies in containers challenging.
Innovation Solution
A method and device using a plurality of sensors arranged one behind the other, alternating activation to minimize interference, allowing simultaneous testing of multiple containers for foreign bodies, particularly metallic ones, by generating relative movements perpendicular to the conveying direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple sensors are arranged closely adjacent to inspect multiple containers simultaneously, then productivity is improved, but measurement precision deteriorates due to sensor interference
Solution Approach 1:
The patent applies periodic action by alternating the activation of multiple sensors in a cyclic manner. During each inspection cycle, sensors are activated sequentially rather than simultaneously - for example, the first sensor is activated while the second sensor is deactivated, then vice versa. This periodic activation pattern eliminates mutual electromagnetic interference between adjacent sensors while maintaining the capability to inspect multiple containers in parallel, thus resolving the contradiction between improved productivity and maintained measurement precision.
2Reliability
If conventional metal detectors are used in intermittently operated bottle lines, then detection capability is provided, but device complexity and cost increase
Solution Approach 1:
The patent applies segmentation by dividing the inspection system into multiple independent sensor units that can be selectively activated. Instead of using a single complex metal detector or tunnel-shaped device, the system employs multiple simpler sensors arranged in series, each capable of inspecting one container. This segmented approach allows the system to process multiple containers simultaneously while keeping each sensor unit simple and inexpensive, thereby reducing overall device complexity and cost while maintaining reliable detection capability.
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 approach ensures reliable, cost-effective detection of foreign bodies with minimized inaccuracies by optimizing sensor operation and design flexibility, enabling efficient testing of containers in synchronized packaging machines.
Implementation Method 1
using a testing device with a plurality of sensors (26, 30, 34), in particular with a first sensor (26) and a second sensor (30), for detecting foreign bodies, in particular for detecting metallic foreign bodies, in the containers (4)
Data Source
Figure 1
Figure 2a~3
AI summary
In a method according to the invention for testing containers (4) for ingestible products by means of a testing device (16) which comprises at least two sensors (26, 30) arranged one behind the other for detecting foreign bodies in the containers (4), a first container (4a) to be tested is tested by the first sensor (26) while the second sensor (30) is deactivated, and a second container (4b) to be tested is tested by the second sensor (30) while the first sensor (26) is deactivated.