Landing-Door Switch Circuit for Double-Car Elevators
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Solution Overview
Problem
In double-car elevators, conventional landing-door switch circuits prevent both cars from traveling even when a landing door is open on a floor that one car cannot access due to the presence of the other car, leading to operational limitations.
Innovation Solution
A landing-door switch circuit with upper-car and lower-car safety and auxiliary circuits that bypass landing-door switches on specific floors, allowing one car to continue traveling even when a landing door is open on a floor to which it cannot travel due to the other car's presence, by using connection units to route power around open doors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional landing-door switch circuit is used in double-car elevator, then safety is ensured by preventing car travel when landing door is open, but operational flexibility deteriorates as both cars cannot travel when a landing door is open on any floor
Solution Approach 1:
The landing-door switch circuit is segmented into car-specific circuits (upper-car safety circuit, lower-car safety circuit) with separate main circuits and auxiliary circuits. Each car has its own set of landing-door switches connected in series, allowing independent control and bypassing capabilities for each car based on its operational needs and position.
Solution Approach 2:
An auxiliary circuit acts as an intermediary between the power supply and the main circuit. This auxiliary circuit includes bypass paths that can selectively circumvent specific landing-door switches when certain conditions are met (e.g., when a car is positioned on a specific floor), enabling flexible operational control while maintaining safety through the main circuit's series-connected switches.
2Device complexity
If landing-door switches are connected in series to switching device, then safety control is simplified, but operational complexity increases due to need for bypassing individual switches in double-car configuration
Solution Approach 1:
The auxiliary circuits for upper car and lower car are merged into a unified control architecture where both auxiliary circuits share common connection units and bypass paths. This merging allows the system to handle double-car operations with a single integrated circuit design rather than requiring completely separate control systems for each car.
Solution Approach 2:
The circuit configuration is made dynamic through the auxiliary circuits that can selectively activate or deactivate bypass paths based on real-time operational conditions. The connection units enable the circuit to adapt its configuration dynamically, switching between normal operation mode (all switches active) and bypass mode (specific switches circumvented) without manual reconfiguration.
3Adaptability or versatility
If bypass circuit is added to allow selective car travel, then operational flexibility improves, but device complexity increases with additional circuits and connection units
Solution Approach 1:
The auxiliary circuits serve multiple functions: they provide bypass paths for open landing-door switches, enable selective car operation based on position, and maintain safety control through their connection to the main circuits. This multi-functionality reduces the need for separate dedicated bypass circuits for each scenario.
Solution Approach 2:
The auxiliary circuit is nested within the overall safety circuit architecture, with connection units that branch from the main circuit and feed back into it. The bypass paths are nested within the auxiliary circuit structure, creating a hierarchical organization where simpler bypass functionality is embedded within the larger safety control system, minimizing overall complexity.
Data Source
AI summary
A landing-door switch circuit according to the present disclosure includes an upper-car safety circuit, an upper-car auxiliary circuit, a lower-car safety circuit, and a lower-car auxiliary circuit. The upper-car safety circuit and the lower-car safety circuit connect excitation coils of switching devices of a power supply for driving an upper car and a lower car, respectively, and a power supply, and include main circuits in which landing-door switches are connected in series, and first connection units and third connection units branched from the main circuits. The upper-car auxiliary circuit and the lower-car auxiliary circuit include a second connection unit and a fourth connection unit on the lower car and the upper car, respectively, to bypass the landing-door switches.