Protective Door Monitoring Using 3-Axis Magnetometer Signals
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Solution Overview
Problem
Existing security systems for protecting hazardous areas on machines face reliability issues due to mutual interference between transponder-based monitoring means, leading to potential malfunctions and unauthorized access.
Innovation Solution
Incorporating a 3-axis magnetometer as a second monitoring means that generates direction-dependent signals, providing precise movement tracking and eliminating interference with the first transponder-based monitoring means, along with a light barrier for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transponder-based first monitoring device is used to detect locking state, then the locking status can be identified, but a second transponder-based monitoring device positioned close to it causes mutual interference and malfunctions
Solution Approach 1:
The patent replaces the second transponder-based monitoring device with a sensor-based monitoring device that detects position through physical sensing (e.g., magnetic fields, optical sensors, or mechanical position sensors) rather than through transponder communication. This substitution eliminates the mutual interference between transponders while maintaining the ability to monitor door position for safety purposes.
2Reliability
If a second monitoring device is added to detect malfunctions of the first monitoring device, then safety is enhanced, but the complexity of the system increases
Solution Approach 1:
The sensor-based second monitoring device serves multiple functions: it detects the actual position of the separating protective device, monitors for malfunctions of the first monitoring device, and provides redundant safety verification. By designing the second device to perform multiple monitoring tasks, the patent enhances safety without proportionally increasing system complexity.
3Area of stationary object
If transponders are positioned close to each other to monitor locking state, then space is saved, but they interfere with each other causing malfunctions
Solution Approach 1:
The patent replaces the interfering transponder-based second monitoring device with a sensor-based device that can detect position through non-interfering physical fields or mechanisms. This allows both monitoring devices to be positioned in close proximity without experiencing mutual interference, thereby saving space while eliminating signal interference problems.
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
Significantly increases the functional reliability of the security system by accurately tracking complex movements and preventing unauthorized access through diverse and non-interfering monitoring means, ensuring safe operation of machines.
Implementation Method 1
The sensor, which is designed to be diverse with respect to the first monitoring means, is a 3-axis magnetometer
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a safety system (1) for a separating protective device (4) comprising a first monitoring means for monitoring whether the separating protective device is locked by means of an interlock (5) and a second monitoring means for detecting the position of the separating protective device. The second monitoring means includes a sensor, different from the first monitoring means, that generates direction-dependent signals.