Elevator Landing-Door Safety Chains for Rapid Fault Response
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Elevator systems often experience malfunctions due to accidentally unlocked door interlocking devices, leading to prolonged service times and safety risks for passengers, as the system is slow to respond and may trap individuals in the elevator car.
Innovation Solution
Implement a method and device that monitor the states of multiple landing door safety chains, group them into decentralized units, and determine a safe landing station based on the car's motion state to swiftly address malfunctions, allowing the car to safely stop and open the doors at a designated station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the elevator control device stops the movement of the elevator car in response to a disconnected landing door safety chain, then the safety risk is reduced, but the service time is prolonged and passengers may be trapped in the car for a long time
Solution Approach 1:
The patent divides the landing door safety chains into multiple independent groups, where each group corresponds to a specific landing door. This segmentation allows the system to identify and respond to failures in specific groups without stopping the entire elevator system, thereby reducing overall service time while maintaining safety. When a failure is detected in one group, only the elevator car at that specific landing station is affected, not all other operations.
Solution Approach 2:
The patent implements dynamic response based on the group of safety chain that experiences disconnection. The elevator control device determines the current landing station and the affected group, then dynamically adjusts the response by allowing the elevator car to continue operation if the failure does not compromise safety. This dynamic approach enables the system to maintain operational efficiency while responding appropriately to safety concerns.
2Device complexity
If the elevator system uses a single series-connected landing door safety chain, then the system structure is simple, but the system is slow to respond to malfunctions and may trap passengers in the car
Solution Approach 1:
The patent segments the single series-connected safety chain into multiple independent groups, where each group monitors a specific landing door. This segmentation enables parallel monitoring of different landing doors, significantly improving the response time to malfunctions. When a failure occurs, the system can quickly identify which group is affected and respond accordingly, rather than waiting for a complete chain failure to be detected.
Solution Approach 2:
The patent transitions from a one-dimensional serial safety chain to a multi-dimensional parallel group structure. By organizing safety chains into multiple groups that can operate independently, the system adds a dimensional layer of parallel monitoring. This dimensional change enables simultaneous monitoring of multiple landing doors and facilitates faster detection and response to failures in any specific group.
3Reliability
If the elevator control device immediately stops the elevator car upon detecting a safety chain disconnection, then passenger safety is prioritized, but the travel distance to a safe landing station increases and evacuation time is extended
Solution Approach 1:
The patent implements preliminary determination of the affected safety chain group and landing station before executing the stop command. The elevator control device identifies which group of safety chains is disconnected and calculates the appropriate response in advance. This preliminary action allows the system to plan the most efficient evacuation path and minimize the travel distance to the safe landing station, thereby reducing evacuation time while maintaining safety.
Solution Approach 2:
The patent changes the control parameter from a binary stop/go decision to a nuanced response based on the specific group and location of the failure. By considering the group identifier and the current position of the elevator car, the system can determine the optimal response parameters, including the destination landing station and the appropriate stopping procedure. This parameter-based approach enables the system to minimize evacuation time while ensuring passenger safety.
Data Source
AI summary
A method and device for disposing of a malfunction of an elevator system, an elevator system including the device, and a non-transitory computer-readable storage medium storing a computer program for implementing the method. In a method for disposing of the malfunction of the elevator system, states of a plurality of landing door safety chains are monitored. Subsequently, in response to an abnormal event associated with the landing door safety chains, a safe landing station at which a car is to be stopped is determined based on a motion state of the car. Landing door state detection devices are divided into a plurality of groups of the landing door state detection devices, and each landing door safety chain comprises one of the plurality of groups of the landing door state detection devices. The motion state of the car comprises a movement speed and a position of the car.