Remote Trigger Device for Elevator Speed Limiter Assembly
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Solution Overview
Problem
Existing elevator speed limiter systems lack a reliable and remotely controllable mechanism to actively trigger the speed limiter assembly without exceeding predetermined speed limits, especially for testing purposes, and may not effectively engage the over-speed locking mechanism to prevent accidents.
Innovation Solution
A speed limiter assembly with a remote trigger device comprising a rotating component and an actuator, where the rotating component is designed to toggle the trigger member of the over-speed locking mechanism, allowing for controlled activation of the speed limiter, even when the elevator has not exceeded the speed limit, using an arc-shaped guide side and axial extension portions to facilitate disengagement of the tripping bar from the ratchet tooth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a remote trigger device is added to enable active triggering of the speed limiter assembly, then testing capabilities and operational safety are improved, but device complexity increases
Solution Approach 1:
The rotating component is nested within the remote trigger device housing, with the actuator positioned to interact with the rotating component. This nested arrangement allows multiple functional elements (actuator, rotating component, trigger member) to be integrated in a compact configuration, adding remote triggering capability while minimizing the increase in overall device complexity
Solution Approach 2:
The rotating component serves as an intermediary element between the actuator and the trigger member of the over-speed locking mechanism. The arc-shaped guide side of the rotating component mediates the transmission of motion from the actuator to the trigger member, enabling controlled activation of the speed limiter assembly while maintaining clear functional separation between components
2Reliability
If the rotating component is designed with arc-shaped guide side and axial extension portions, then the reliability of triggering the over-speed locking mechanism is improved, but manufacturing precision requirements increase
Solution Approach 1:
The rotating component incorporates an arc-shaped guide side instead of a straight or angular surface. This curved geometry provides a gradual, controlled path for engaging the trigger member, ensuring reliable disengagement of the ratchet tooth from the tripping bar. The arc shape distributes contact forces more evenly and reduces stress concentrations, improving triggering reliability while the standard arc geometry can be manufactured with conventional precision machining
Solution Approach 2:
The rotating component is designed with distinct functional segments: the arc-shaped guide side for engagement, the axial extension portions for positioning, and the body for structural support. This segmentation allows each feature to be optimized independently for its specific function, with the arc-shaped guide side focused on reliable triggering and the axial extensions focused on precise positioning, thereby managing manufacturing precision requirements across different features
3Ease of operation
If the actuator is positioned to engage the first end of the rotating component, then ease of operation for remote triggering is improved, but device complexity increases
Solution Approach 1:
The actuator is positioned to directly engage the first end of the rotating component, which is configured with a feature (such as a flat surface or protrusion) that receives the actuating force. This arrangement allows the actuator to self-align and apply force effectively without requiring complex positioning mechanisms, mounting brackets, or adjustment devices, thereby improving ease of operation while minimizing the increase in device complexity
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 safe and controlled activation of the speed limiter assembly, ensuring the elevator's safety by preventing over-speed conditions through remote triggering, thereby enhancing operational safety and testing capabilities.
Implementation Method 1
an elastic element. The elastic element may tend to enable the rotating component to be restored to the idle position
Implementation Method 2
When the rotating speed of the rope sheave exceeds a certain value, a mechanism based on a centrifugal force triggers an over-speed locking mechanism
Data Source
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AI summary
The present invention provides a remote trigger device, a speed limiter assembly having the same and an elevator. The remote trigger device for the speed limiter assembly comprises: an actuator; and a rotating component, the rotating component being capable of rotating around a rotating axis in a rotating plane, the rotating component being actuated by the actuator to rotate from an idle position to a working position. During rotation of the speed limiter assembly, at the idle position, the rotating component is kept separated from an over-speed locking mechanism of the speed limiter assembly, and at the working position, the rotating component toggles a trigger member of the over-speed locking mechanism of the speed limiter assembly to trigger the speed limiter assembly. The structure of the remote trigger device according to the present invention is compact and simple.