Worker Island Monitoring for Automated Hazard Protection
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Solution Overview
Problem
Conventional safety systems in industrial environments struggle to reliably protect workers from machine hazards due to difficulties in detecting people in complex and interfered-with areas, leading to potential injuries and system delays, as they require manual monitoring and are prone to errors and interference.
Innovation Solution
A security device that monitors the number and position of people within a controlled worker island area, using a combination of optoelectronic sensors and redundant systems like RFID readers, ensuring automated and reliable protection by preventing unauthorized access and tracking personnel movements, thus eliminating the need for manual checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If optical sensors are used to monitor the danger area, then automated protection is achieved, but reliability deteriorates due to interference from sawdust, welding sparks, rain, fog, or snow
Solution Approach 1:
Instead of monitoring the danger area directly with sensors that are vulnerable to environmental interference, the patent inverts the approach by monitoring the worker island (safe area) to determine if workers are present in the danger zone. This indirect monitoring method avoids the reliability issues caused by sawdust, welding sparks, rain, fog, and snow that plague direct optical sensing in the hazard area.
Solution Approach 2:
The patent introduces an intermediary approach where the worker island monitoring system acts as a mediator between the safe worker area and the dangerous machine area. By counting workers on the worker island and comparing this to the total number of workers in the system, the patent indirectly determines danger zone occupancy without requiring direct sensing in the interfered-with danger area.
2Measurement precision
If manual monitoring of the danger area is required, then detection accuracy improves, but productivity deteriorates due to increased cycle time
Solution Approach 1:
The system performs self-service by automatically monitoring worker positions through the worker island counting system and autonomously determining whether machine operation is safe. This eliminates the need for manual monitoring while maintaining high detection accuracy, thereby resolving the contradiction between precision and productivity.
Solution Approach 2:
The patent implements a feedback mechanism where the worker island monitoring system continuously provides information about worker positions to the control system. This automated feedback loop enables real-time safety decisions without manual intervention, maintaining high detection accuracy while significantly reducing cycle time compared to manual monitoring procedures.
3Reliability
If workers must visually check the danger area before startup, then safety improves, but productivity deteriorates due to monotony and decreased concentration
Solution Approach 1:
The patent replaces the mechanical/manual visual checking process with an automated optical/electronic monitoring system. The worker island monitoring system automatically detects and counts workers, eliminating the need for manual visual inspection. This substitution maintains safety while removing the productivity penalties associated with worker fatigue and decreased concentration during repetitive manual checks.
4Reliability
If mechanical protection is implemented, then worker protection improves, but adaptability deteriorates due to restricted system flexibility
Solution Approach 1:
The patent replaces mechanical protection systems (such as physical barriers and interlocked guards) with an automated monitoring system based on worker island detection. This substitution maintains worker protection through automated safety decisions while significantly improving system flexibility and adaptability, allowing the system to respond dynamically to different operational conditions without physical reconfiguration.
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 reliable and automated startup of systems in challenging environments, optimizing process cycle times and preventing injuries by ensuring all personnel are safely positioned before machine operation, while reducing the risk of errors and interference.
Implementation Method 1
The worker island monitoring device (22) has an optoelectronic sensor (24a-b)
Implementation Method 2
The worker island monitoring device (22) has an RFID reader (26a-b)
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The device has worker islands (20a-c) provided in a spatial region (10) in which persons (14a-e) are not at risk. Worker island-monitoring devices (22a, 22b) determine presence and number of persons on the worker island. A switch-off output outputs a switch-off signal at hazard sources (16a-c) when the persons are not in the spatial region on the hazard sources. The monitoring devices include optoelectronic sensor units (24a, 24b). The sensor unit includes a laser scanner e.g. three-dimensional laser scanner and distance-measuring two-dimensional laser scanner. An independent claim is also included for a method for securing persons in a spatial region.