Elevator Derailment Detection via Dual DC Voltage Segmentation
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Solution Overview
Problem
In high-lift buildings, the prolonged conductor wire in elevator derailment detecting devices experiences unstable electric resistance due to corrosion, making it difficult to detect changes in weak current, which hampers accurate derailment detection.
Innovation Solution
The implementation of an elevator derailment detecting device with first and second conductor wires, each supplied with different DC voltages, and a contacting means that connects these wires when the ascending and descending part is derailed, allowing for reliable detection of the DC voltage change using a different voltage detector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the conductor wire is prolonged for high-lift buildings, then the detection coverage is improved, but the electric resistance becomes unstable due to corrosion
Solution Approach 1:
The single prolonged conductor wire is divided into multiple separate conductor wires (first conductor wire, second conductor wire, etc.). Each conductor wire has a manageable length and is independently supported, preventing the corrosion and resistance instability issues that occur in single prolonged wires for high-lift buildings.
Solution Approach 2:
Multiple conductor wires are introduced as intermediaries between the current detector and the ascending/descending body. These multiple wires work together to detect derailment while reducing the impact of individual wire corrosion, as the system can detect voltage changes across the collective arrangement.
2Device complexity
If a single conductor wire is used, then the device complexity is reduced, but the measurement precision deteriorates due to resistance fluctuations
Solution Approach 1:
Different conductor wires are positioned at different locations near the guide rail, with each wire having specific local characteristics. The contacting means is designed to contact specific conductor wires when derailment occurs, allowing precise localization of the derailment event while maintaining simple overall device structure.
3Ease of operation
If the conductor wire is positioned far from the ascending and descending body, then the interference with normal operation is reduced, but the detection sensitivity decreases
Solution Approach 1:
The contacting means is pre-configured to contact the conductor wires only when derailment occurs. The conductor wires are positioned and supported such that they are ready to detect contact, but do not interfere with normal ascending/descending body operation during regular elevator use.
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
This configuration ensures accurate detection of derailment by minimizing the impact of conductor wire resistance fluctuations and corrosion, ensuring reliable operation even in high-lift scenarios.
Implementation Method 1
a first DC power supply unit which applies a first DC voltage to the first conductor wire, and a second DC power supply unit which applies a second DC voltage to the second conductor wire
Implementation Method 2
the contacting means contacts the first and second guide wires when the ascending and descending part is derailed from the guide rail, so that a DC voltage generated at the second conductor wire is detected by the different voltage detector
Data Source
AI summary
An elevator derailment detecting device according to the present invention detects the opened and closed states of contacts at first and second safety relays 82 and 83 (steps S1 and S2). Since a first NO contact 82b is closed, a first NC contact 82c is opened, a second NO contact 83b is closed, and a second NC contact 83c is opened, it is determined that there is no circuit failure. Then, the opened and closed state of the contactless relay 84 is detected (step S3). When the contactless relay NO contact 84b is closed and the contactless relay NC contact 84c is opened, it is determined that the counterweight 21 of the elevator 11 is in a derailed state.