Elevator Door Torque Diagnosis for Hall Door Self-Closing
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Solution Overview
Problem
Conventional elevator systems lack a method to automatically diagnose whether hall doors can self-close, leading to cumbersome maintenance checks and potential issues due to increased running loss from aging, which affects the self-closing functionality.
Innovation Solution
An elevator door control device with a torque detection unit and diagnosis unit that assesses the self-closing force of hall doors by detecting motor torque during door operations, allowing for automatic diagnosis of self-closability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hall door closer device is installed to provide self-closing force, then the hall door can self-return to full-close state, but running loss increases due to aging which impairs self-closing capability
Solution Approach 1:
The system performs preliminary diagnosis of the hall door's self-closing capability by detecting motor torque during normal car door operations. This allows early detection of aging-related running loss increases before they completely impair self-closing functionality, enabling proactive maintenance scheduling.
Solution Approach 2:
The control unit continuously monitors motor torque during door operations and provides feedback on the hall door closer's performance. This feedback mechanism tracks the degradation of self-closing capability over time due to aging and running loss, allowing the system to assess when maintenance is needed.
2Reliability
If manual maintenance checks are performed to verify hall door self-closing, then self-closing abnormality can be detected, but maintenance becomes cumbersome and time-consuming
Solution Approach 1:
The elevator system performs self-diagnosis of hall door self-closing capability during normal operations. The control unit automatically monitors motor torque and assesses closer performance without requiring manual intervention, eliminating the need for maintenance personnel to physically test each hall door.
Solution Approach 2:
The motor and control unit serve multiple functions: they drive car door operations during normal service and simultaneously diagnose hall door self-closing capability during the same operations. This multi-functionality allows the system to perform maintenance checks without adding separate dedicated testing mechanisms.
3Productivity
If hall door self-closing is not diagnosed, then normal operation continues, but hall doors may remain open causing safety issues and operational problems
Solution Approach 1:
The control unit continuously monitors motor torque during door operations and provides feedback on hall door closer performance. This ongoing feedback enables the system to detect degradation trends and alert operators before complete failure occurs, maintaining both operational continuity and reliability.
Solution Approach 2:
The system performs preliminary detection of self-closing abnormalities during normal operations before they lead to complete failure. By monitoring torque variations and assessing closer effectiveness in advance, the system can schedule maintenance before hall doors become unreliable.
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
Enables automatic diagnosis of hall door self-closability, reducing maintenance burdens and early detection of self-closing force abnormalities, thereby improving operational efficiency and extending maintenance cycles.
Implementation Method 1
a torque detection unit configured to detect a torque of the motor in at least one of door opening and door closing of the panels when the panels are jointed to each other
Data Source
AI summary
An elevator door control device includes: a car door panel and a hall door panel that open/close, respectively; a motor that drives the car door panel to open/close; jointing means for mechanically jointing the car door panel and the hall door panel to each other so that the panels open/close in an integrated manner; a closer device that provides a self-closing force in a door close direction to the hall door panel, and controller controlling the motor. The controller includes a torque detection unit that detects a torque of the motor in at least one of door closing and door opening of the panels when the panels are jointed to each other, and a diagnosis unit determines whether or not the hall door panel can self-close via the self-closing force when the panels are not jointed to each other, based on the torque detected by the torque detection unit.