Bidirectional Escalator Handrail Safety Blocking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing passenger transport systems, such as escalators and moving walkways, face challenges in safely reversing the direction of travel due to the need for extensive reconfiguration of protective devices and control system changes, leading to significant downtime and increased complexity.
Innovation Solution
A passenger transport system with a conveyor belt, balustrade, and handrail, equipped with a fastening device for protective devices at handrail end curves and sensors to detect their presence, which allows the control unit to block dangerous travel directions, enabling easy direction changes without increasing system complexity or costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protective devices are mounted on the balustrade to protect against accidents at the handrail end curve, then safety is improved, but the system can only operate in one direction of travel requiring manual reconfiguration for direction changes
Solution Approach 1:
The control system dynamically adapts the blocking configuration based on the detected direction of travel. The control unit automatically switches which end curve is blocked, transforming the static protective device arrangement into a dynamic safety system that maintains protection while enabling bidirectional operation.
Solution Approach 2:
The control unit receives feedback about the handrail's movement direction and automatically adjusts the blocking configuration accordingly. This feedback mechanism enables the system to maintain safety while adapting to changing operational requirements without manual intervention.
2Reliability
If the control system blocks one direction of travel to ensure safety with protective devices, then safety is improved, but considerable downtime and qualified personnel are required for direction changes
Solution Approach 1:
The control system performs the reconfiguration automatically based on sensor input about the desired direction of travel. This self-service capability eliminates the need for qualified personnel to manually reconfigure protective devices and reduces downtime to minimal system restart time.
Solution Approach 2:
The manual mechanical reconfiguration of protective devices is replaced by an automated control system that uses sensors and control logic to manage safety blocking. This substitution eliminates the time-consuming physical relocation of protective devices.
3Reliability
If protective devices with curved housings are mounted on the balustrade, then protection against accidents is improved, but the system complexity increases due to manual reconfiguration requirements
Solution Approach 1:
The control unit uses sensor feedback to automatically determine which end curve should be blocked based on the handrail's movement direction. This feedback-driven approach maintains protection while eliminating the complexity of manual reconfiguration procedures.
Solution Approach 2:
The control system serves multiple functions: it monitors the handrail movement, determines the direction of travel, selects the appropriate blocking configuration, and executes the safety control. This multi-functionality consolidates what would otherwise require separate manual operations into a single automated system.
Data Source
AI summary
A passenger transport system having a conveyor belt is described. The passenger transport system comprises at least one handrail and a fastening device for a protective device in the region of the handrail end curve. A control unit blocks the operation of the passenger transport system in one direction of travel on the basis of a sensor signal, such that, if there is at least one protective device in the region of the handrail end curve, the direction of travel in which the handrail runs into the protective device is blocked. A method for controlling a bidirectional passenger transport system is also described.