Spreader Proximity Alert Coverage for Under-Container Blind Spots
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Solution Overview
Problem
Existing proximity alert systems for spreaders fail to detect personnel directly under the container, posing a significant safety risk during operations and maintenance due to the 3D lifting nature of spreader operations, which current sensing technologies like UWB cannot address.
Innovation Solution
Implementing a system with UWB sensing devices mounted on the spreader to detect personnel tags, defining caution and danger zones, and activating staged alarms to prevent accidents, including an 'under container' alarm if necessary, ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard PAS technology is applied to spreaders, then personnel detection capability is improved, but detection reliability deteriorates due to blind spots under containers during lifting operations
Solution Approach 1:
The detection zone is segmented into multiple zones (caution zone and danger zone) with different alarm levels, and the sensing coverage is divided to specifically address the blind spot under containers by adding dedicated sensing zones in those areas
Solution Approach 2:
Different alarm levels are applied to different spatial zones: caution zone for initial detection and danger zone for critical proximity, with enhanced sensing specifically positioned to cover the blind spot area under containers during lifting operations
2Adaptability or versatility
If the spreader operates in 3D space with container lifting, then operational versatility is improved, but safety monitoring capability deteriorates due to blind spots created by container blockage
Solution Approach 1:
The system addresses the 3D space challenge by creating multiple detection zones at different vertical and horizontal levels, with specific emphasis on detecting personnel in the blind spot zone under containers during lifting operations
Solution Approach 2:
The system uses intermediary alarm zones (caution zone and danger zone) as mediators between the operator and potential hazards, providing staged warnings that compensate for the blind spots created by container blockage during 3D operations
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
Enhances safety by effectively detecting personnel in proximity to spreaders, preventing collisions and injuries by triggering appropriate alarms based on defined zones, thus ensuring safe operation and maintenance.
Implementation Method 1
Implementing a system with UWB sensing devices mounted on the spreader to detect personnel tags
Data Source
AI summary
A method for detecting whether a tag is proximate to a spreader, the method comprising the steps of: detecting the tag by a sensing device mounted to the spreader; locating the tag in a danger zone relative to the spreader, and then; activating a danger zone alarm to an operator of the spreader; if the tag is no longer located in the danger zone; determining if the tag has entered a caution zone; if the tag is located in the caution zone, then clearing the danger zone alarm; if the tag has not been located in the caution zone or the danger zone, then; maintaining the danger zone alarm.