Elevator Turning Station Safety Arrangement Preventing Derailment
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Solution Overview
Problem
Elevators with linear motors face challenges in safely changing movement direction between non-parallel paths, such as vertical and horizontal, leading to risks of derailment due to misalignment of rail portions at turning stations.
Innovation Solution
A safety arrangement comprising first and second mechanical devices that can change positions to prevent derailment by blocking or aligning the elevator car's movement at turning stations, with buffer devices to absorb collision energy, ensuring proper alignment of rail portions and preventing misalignment-induced derailment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical blocking devices are added to prevent derailment at turning stations, then safety is improved, but device complexity increases
Solution Approach 1:
The blocking devices are positioned in advance at the turning station to prevent derailment before it occurs. The system proactively blocks the path if misalignment is detected, rather than reacting after a derailment event. This preliminary protective action enhances safety while keeping the blocking mechanism relatively simple.
Solution Approach 2:
The blocking devices act as intermediary elements between the elevator car and the turning station rails. These devices mediate the interaction by providing a mechanical barrier that prevents the car from entering or exiting the turning station when misalignment is detected, thereby protecting the system without requiring complex active control mechanisms.
2Reliability
If blocking devices are positioned to prevent derailment, then safety is improved, but the elevator car movement is restricted
Solution Approach 1:
The blocking devices are designed to be dynamic rather than static. They can move between blocked and unblocked positions based on the operational state of the turning station. When the turning station is properly aligned and operational, the blocking devices retract to allow smooth car movement. When misalignment occurs, they activate to provide blocking, thus adapting to different operational conditions.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor the alignment status of the turning station and automatically control the blocking devices accordingly. When the turning station is in the correct position, the feedback signal allows the blocking devices to retract. When misalignment is detected, the feedback triggers the blocking devices to activate, creating a closed-loop control system that balances safety with operational smoothness.
Data Source
AI summary
A safety arrangement is suitable for a turning station of an elevator system. The safety arrangement includes at least one first blocking position for preventing, by a first mechanical device, an elevator car from entering the turning station, wherein the first mechanical device is arranged to change its position in response to operation of the turning station, and at least one second blocking position for preventing, by a second mechanical device, an elevator car from exiting the turning station.