Passenger Conveyor Interlocking Control for Startup Sequence Safety
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Solution Overview
Problem
The existing passenger transportation systems face safety hazards due to sudden stoppages of devices, leading to potential stampedes or collisions, as upstream devices may continue operating while downstream devices are faulty, causing passengers to gather and increasing the risk of accidents.
Innovation Solution
A startup and shutdown control method where the downstream passenger transportation device is started before the upstream device, and vice versa during stopping, utilizing an electrical interlocking assembly to coordinate the sequence of operations and prevent simultaneous movement or stopping of adjacent devices, ensuring safe and reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the upstream passenger transportation device continues operating while the downstream device is faulty, then the productivity is maintained, but the safety deteriorates causing passenger congestion and potential stampedes
Solution Approach 1:
The control system performs preliminary action by detecting faults in the downstream device and automatically stopping the upstream device before passengers can accumulate. The interlocking control mechanism pre-establishes the safety protocol where upstream device operation is conditional on downstream device normal operation, preventing passenger congestion before it occurs.
2Reliability
If the upstream passenger transportation device is stopped immediately when downstream device fails, then the safety is improved, but the productivity deteriorates due to system-wide shutdown
Solution Approach 1:
The control system segments the passenger transportation system into independent controllable units with hierarchical control logic. When a downstream device fails, only the affected upstream device is stopped through localized interlocking control, while other independent segments of the system can continue operating, maintaining partial productivity while ensuring safety.
3Ease of operation
If multiple passenger transportation devices operate independently without coordination, then the ease of operation is improved, but the safety deteriorates due to lack of coordinated control
Solution Approach 1:
The control system introduces an intermediary interlocking control mechanism that mediates between independently operated devices. The downstream device's operational status acts as an intermediary signal that automatically controls the upstream device's operation, providing coordinated safety control without requiring complex manual coordination while maintaining operational simplicity.
Data Source
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AI summary
The present invention provides a passenger transportation system and a startup and shutdown control methodA passenger transportation system comprises: a plurality of series-connected passenger transportation devices (100, 200); an electrical control system (300) comprising a plurality of startup and shutdown circuits which are respectively used for controlling startup and shutdown of each of the passenger transportation devices; and an electrical interlocking assembly coupled between each of the startup and shutdown circuits, wherein the electrical interlocking assembly controls a startup and shutdown sequence of a low-position passenger transportation device and a high-position passenger transportation device by controlling closing and opening of each of the startup and shutdown circuits. With such a passenger transportation system and the startup and shutdown control method thereof, the startup and shutdown reliability of each of the passenger transportation devices in the system is improved, the problem of gathering or crowding of various people due to a sudden stop caused by system startup and shutdown or by a system fault is avoided, thereby avoiding safety incidents.