Elevator Actuator Self-Locking Mechanism for Impact Resistance
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Solution Overview
Problem
Existing car-mounted governor assemblies for elevators face challenges in preventing the actuator from retracting after impact, requiring high electromagnetic forces, and compromising the reliability of remote triggering apparatuses, especially in high-speed applications.
Innovation Solution
A self-locking actuator design featuring a mandrel, mandrel sleeve, and shell with sliding members that move radially to lock the mandrel sleeve at the actuation position, distributing impact forces to the shell and reducing the need for high electromagnetic forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the actuator uses a direct electromagnetic drive without self-locking mechanism, then the electromagnetic force requirements are high, but the actuator can retract after impact and reliability is reduced
Solution Approach 1:
The patent employs dynamic elements including a movable mandrel that transitions between retracted and extended positions, sliding members that move radially to engage locking surfaces, and a spring mechanism that provides resetting force. These dynamic components enable the actuator to achieve self-locking at the actuation position while reducing electromagnetic force requirements through mechanical advantage and force distribution.
Solution Approach 2:
The patent introduces intermediate mechanical components between the electromagnetic driver and the actuation mechanism, including the mandrel, mandrel sleeve, and sliding members. These intermediaries transfer and amplify the electromagnetic force, distribute impact loads, and provide the self-locking function without requiring excessively high electromagnetic forces.
2Reliability
If the mandrel directly absorbs impact forces, then the electromagnetic force requirements remain high, but the mandrel may be damaged and reliability reduced
Solution Approach 1:
The patent segments the impact force absorption function across multiple components: the mandrel sleeve, shell, and sliding members collectively bear the impact loads. This segmentation protects the mandrel from direct impact damage while distributing the strength requirements across robust supporting structures designed to handle mechanical shocks.
Solution Approach 2:
The patent incorporates protective design features that cushion against impact forces before they can damage the mandrel. The sliding members and mandrel sleeve are positioned and designed to absorb and distribute impact loads, providing beforehand protection to the mandrel against damage from sudden mechanical shocks during operation.
3Reliability
If the actuator allows mandrel retraction after actuation, then the structure is simpler, but the remote triggering reliability is compromised
Solution Approach 1:
The patent implements a self-locking mechanism where the actuator automatically maintains its actuated position without requiring external locking components or complex control systems. The sliding members and mandrel sleeve work together to automatically lock the mandrel in place after electromagnetic actuation, providing self-service reliability while keeping the overall structure relatively simple.
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 actuator effectively prevents retraction after impact, lowers electromagnetic force requirements, and enhances the reliability of remote triggering and governor systems, particularly in high-speed elevators by absorbing impact forces without damaging the mandrel.
Implementation Method 1
The existing remote triggering apparatus is mainly composed of an electromagnet
Implementation Method 2
lowering the requirements for electromagnetic forces of the actuator, thereby lowering the requirements for the actuator; and in another aspect, the present invention is aimed at improving the reliability of a remote triggering apparatus, a governor, and an elevator
Data Source
AI summary
An actuator, a remote triggering apparatus, a governor, and an elevator. The actuator includes: a mandrel, the mandrel having a proximal end and a distal end, and the mandrel being driven to move from a contraction position toward an actuation position; a mandrel sleeve; and a shell, the shell defining a channel, wherein the actuator further includes at least one sliding member, and when the mandrel moves from the contraction position toward the actuation position, the at least one sliding member is located at a first radial position where the mandrel is joined to the mandrel sleeve, such that the mandrel sleeve can move along the channel together with the mandrel; and wherein at the actuation position, the at least one sliding member moves outward radially to a second radial position where the mandrel sleeve is joined to the shell, thus locking the mandrel sleeve.