Elevator Safety Device with Dynamic Resistance Control
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Solution Overview
Problem
Conventional elevator apparatuses face complexity in speed governor construction to reduce first and second overspeed values near terminal floors, leading to space and cost inefficiencies.
Innovation Solution
An elevator apparatus with an abnormal acceleration detecting mechanism using a mass body to generate inertia and activate a safety device, along with a resistance force applying apparatus that adjusts resistance based on suspending means breakage detection, allowing for a simpler configuration and adjustable force settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the first overspeed Vos and second overspeed Vtr are reduced in the vicinity of terminal floors to shorten buffer stroke, then the buffering stroke can be shortened, but the construction of speed governors becomes complicated
Solution Approach 1:
The invention changes the parameter of resistance force applied to the safety device mechanism. By dynamically adjusting the resistance force based on suspending means status, the system achieves reduced buffering stroke without complicating the speed governor construction. The resistance force is reduced when breakage is detected, allowing the safety device to activate more easily and stop the car at lower velocities.
Solution Approach 2:
The invention introduces dynamic adjustment of resistance force based on real-time detection of suspending means status. The resistance force applying apparatus modifies the resistance force according to the operational state (normal or broken), enabling the safety device to adapt its activation characteristics without requiring complex speed governor modifications.
2Speed
If a terminal overspeed Vts is used to shut off power supply near terminal floors, then the car velocity can be controlled, but the car may still collide with buffer at high velocity if main rope breaks
Solution Approach 1:
The invention introduces a breakage detecting means as an intermediary between the suspending means and the safety device activation. This detector mediates the information about suspending means status to the resistance force applying apparatus, which then adjusts the resistance force accordingly. This intermediary system ensures reliable safety activation regardless of whether the main rope is intact or broken.
Solution Approach 2:
The invention applies preliminary anti-action by detecting potential failures (main rope breakage) before they lead to catastrophic collisions. The breakage detecting means identifies the failure condition early, and the resistance force is reduced immediately to prepare the safety device for activation, preventing the harmful effect of high-velocity buffer collision.
3Ease of operation
If the resistance force is reduced when breakage is detected, then the safety device can be activated more easily, but the force required for activation must be precisely controlled
Solution Approach 1:
The invention enables self-service by allowing the resistance force applying apparatus to automatically adjust the resistance force based on feedback from the breakage detecting means. The system self-regulates the force characteristics without requiring manual intervention or complex precision adjustment mechanisms, achieving ease of operation through automated force control.
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
This solution enables space-saving in hoistways by simplifying the construction of speed governors and reducing the buffering stroke, while allowing for cost-effective adjustments and reduced inertial mass, thus enhancing safety and efficiency.
Implementation Method 1
an abnormal acceleration detecting mechanism that includes a mass body which operates in connection with movement of the car, the abnormal acceleration detecting mechanism operating the safety device using a force of inertia that is generated by the mass body if an acceleration that exceeds a predetermined set value arises in the car
Implementation Method 2
a resistance force applying apparatus that applies a resistance force to a mechanism for activating the safety device such that the resistance force is applied when breakage of the suspending means is not detected by the breakage detecting means and the resistance force is reduced if breakage of the suspending means is detected by the breakage detecting means
Data Source
AI summary
In an elevator apparatus, an abnormal acceleration detecting mechanism includes a mass body that operates in connection with movement of the car, the abnormal acceleration detecting mechanism operating a safety device using a force of inertia that is generated by the mass body if an acceleration that exceeds a predetermined set value arises in a car. A breakage detecting means detects breakage of a suspending means that suspends the car. A resistance force applying apparatus applies a resistance force to a mechanism for activating the safety device such that the resistance force is applied when breakage of the suspending means is not detected by the breakage detecting means and the resistance force is reduced if breakage of the suspending means is detected by the breakage detecting means.