Elevator Door Bypass Relay for Inspection Mode Control
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Solution Overview
Problem
Existing elevator failure detection apparatuses fail to satisfy the requirements for bypassing landing and car doors during inspections or emergencies, as they do not allow for independent monitoring and simultaneous bypassing while preventing normal operation.
Innovation Solution
An elevator door bypass apparatus with a door mode selector switch, a bypass target selector switch, and a bypass relay that enables switching between normal and bypass operations, allowing for independent bypassing of either the landing or car door, while preventing simultaneous bypassing and ensuring safety through a relay circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a door bypass apparatus is provided to bypass landing door and car door contacts during maintenance, then the contacts can be bypassed for inspection purposes, but the apparatus fails to prevent normal operation control and allow independent monitoring
Solution Approach 1:
The bypass function is segmented into separate controllable paths: a door mode selector switch separates normal operation mode from bypass operation mode, and a bypass target selector switch separates bypassing of landing door from bypassing of car door. This segmentation allows independent control and monitoring of each bypass action, maintaining safety while enabling maintenance operations.
Solution Approach 2:
The control unit acts as an intermediary between the selector switches and the door closing switches/door lock switches. It receives selection signals from the switches, processes them according to safety logic, and then controls the bypass relay accordingly. This intermediary function ensures that bypass operations are properly authorized and monitored before execution.
2Ease of operation
If the existing failure detection apparatus is used, then short-circuit detection is provided, but it cannot enable bypass operation with independent monitoring and simultaneous bypass prevention
Solution Approach 1:
The control unit performs multiple functions: it monitors the door mode selector switch and bypass target selector switch, determines which door closing switch or door lock switch should be bypassed based on the selections, controls the bypass relay accordingly, and provides independent monitoring capability. This multi-functionality consolidates what would otherwise require separate devices into a single integrated control unit.
Solution Approach 2:
The door mode selector switch and bypass target selector switch are configured to require deliberate operator action before bypass operation begins. The control unit must first receive a mode selection signal before it will allow bypassing, ensuring that bypass operations are intentional and properly authorized rather than accidental.
3Adaptability or versatility
If normal operation control is disabled during bypass, then bypass operation is enabled, but independent monitoring signal for car door closure is not provided
Solution Approach 1:
The monitoring system dynamically adapts based on the operational mode. When in bypass operation mode with car door bypass selected, the control unit provides an independent monitoring signal to detect whether the car door is fully closed, whereas in normal operation mode the standard door closing switch monitoring is used. This dynamic adjustment maintains appropriate monitoring throughout all operational states.
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
The apparatus effectively bypasses either the landing or car door during inspections or emergencies, satisfying the specified requirements with an inexpensive configuration, ensuring safe operation and independent monitoring.
Implementation Method 1
a bypass relay configured to, in a case where the door mode has been switched to the bypass operation by the door mode selector switch, bypass the landing door when the bypassing of the landing door has been selected by the bypass target selector switch, and bypass the car door when the bypassing of the car door has been selected by the bypass target selector switch
Data Source
AI summary
An elevator door bypass apparatus, configured to bypass a landing door or a car door at a time of an inspection of an elevator, includes: a door mode selector switch configured to switch a door mode between a normal operation and a bypass operation; a bypass target selector switch configured to switch between bypassing of the landing door and bypassing of the car door; and a bypass relay configured to, in a case that the door mode has been switched to the bypass operation by the door mode selector switch, bypass the landing door when the bypassing of the landing door has been selected by the bypass target selector switch, and bypass the car door when the bypassing of the car door has been selected by the bypass target selector switch.