Elevator Linkage Device for Door Unlocking Reliability
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Solution Overview
Problem
In conventional elevator systems, the movement of the car door before the linkage device is fully coupled with the hall door can cause a change in the lock hook trajectory, preventing the car door from being unlocked, leading to safety and operational issues.
Innovation Solution
A linkage device with a link mechanism comprising parallel first and second links, each with a slider and support spring, and an actuating mechanism that allows the door vanes to switch between contracted and expanded positions, ensuring the car door remains stationary until fully coupled with the hall door, preventing premature movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the car door moves before the linkage device completes coupling, then the door opening speed is improved, but the lock hook trajectory changes causing unlocking failure
Solution Approach 1:
The linkage device is designed to complete the coupling action between the car door and hall door before the car door begins its opening movement. The parallel link mechanism with sliders ensures that the coupling is established in advance, preventing trajectory changes during door movement.
Solution Approach 2:
The link mechanism incorporates sliders that can move along the link bodies, allowing the coupling structure to adapt dynamically during the door opening process. This dynamic adjustment maintains proper lock hook trajectory while enabling smooth door movement.
2Device complexity
If the linkage device uses rigid connection, then the structural simplicity is improved, but the alignment precision requirement increases
Solution Approach 1:
The linkage device is divided into separate modular components: link bodies, sliders, and support springs. Each component can be manufactured independently with standard tolerances, and the sliders provide adjustment capability to accommodate alignment variations without requiring high-precision door roller positioning.
Solution Approach 2:
The support springs allow the linkage device to accommodate variations in door roller position by elastic deformation. This parameter change (spring compression/extension) compensates for alignment tolerances, reducing the strictness of manufacturing precision requirements.
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 solution ensures the car door is securely locked in the expanded position, allowing for proper unlocking and reducing the need for precise alignment of door rollers, enhancing safety and operational efficiency by maintaining the car door's stationary state until fully expanded.
Implementation Method 1
the first link and the second link each include a support spring for supporting the slider
Implementation Method 2
a link mechanism; a first door vane and a second door vane that are connected to the link mechanism; and an actuating mechanism for actuating the link mechanism so that the first door vane and the second door vane are switched between a contracted position and an expanded position
Data Source
AI summary
A linkage device used between an elevator car door and a hall door, and an elevator system. The linkage device includes: a link mechanism; a first door vane and a second door vane that are connected to the link mechanism; and an actuating mechanism for actuating the link mechanism so that the first door vane and the second door vane are switched between a contracted position and an expanded position; wherein the link mechanism includes: a first link and a second link arranged in parallel, each of which includes a link body and a slider; the link body of the first link and the link body of the second link are pivotally connected to the car door, and the slider of the first link and the slider of the second link are each capable of sliding along a passage defined by the corresponding link body.