Elevator Damper Pressing Force Dynamics for Braking Stability
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Solution Overview
Problem
Conventional elevator emergency safety devices face issues with irregularities in braking force and increased weight due to the need for a wedge-shaped damper configuration, leading to poor electric power utilization efficiency and fluctuations in deceleration rate.
Innovation Solution
A damper system with a movable member and a pressing force applying portion that adjusts the pressing force dynamically by changing the position of the contacting portion between sliding surfaces, allowing the damper to move vertically and maintain a consistent braking force without increasing size or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the braking surface area of the damper is increased to suppress irregularities in braking force, then the braking force stability is improved, but the damper size and weight are increased
Solution Approach 1:
The patent applies the dynamics principle by making the pressing force adjustable through the pressing force applying portion. The pressing force is dynamically changed based on the descent speed of the hoisted body, allowing the braking force to be stabilized without requiring a larger braking surface area. This dynamic adjustment mechanism resolves the contradiction by maintaining braking force stability while keeping the damper size and weight reduced.
Solution Approach 2:
The patent applies parameter changes by modifying the pressing force parameter through the pressing force applying portion. The pressing force is changed according to the descent speed conditions, which directly affects the braking force. By changing this parameter dynamically, the system achieves stable braking force without increasing the physical dimensions of the damper, thus resolving the contradiction between braking force stability and damper weight.
2Use of energy by moving object
If the damper size is reduced to improve electric power utilization efficiency, then the weight is decreased, but the braking surface area is reduced leading to increased irregularities in braking force
Solution Approach 1:
The patent applies dynamics by implementing a pressing force applying portion that dynamically adjusts the pressing force based on descent speed. This dynamic adjustment compensates for the reduced braking surface area, maintaining braking force stability even when the damper size is reduced to improve electric power utilization efficiency.
Solution Approach 2:
The patent applies parameter changes by modifying the pressing force parameter in response to descent speed variations. This parameter adjustment ensures that braking force stability is maintained despite the reduced damper size, allowing the system to achieve both reduced weight and stable braking performance.
3Reliability
If the pressing force is increased to maintain consistent braking force, then the braking force stability is improved, but the deceleration rate becomes excessive when braking force increases
Solution Approach 1:
The patent applies dynamics by making the pressing force adjustable through the pressing force applying portion. The pressing force is dynamically regulated based on the descent speed of the hoisted body, ensuring that braking force consistency is achieved without causing excessive deceleration. The system automatically adjusts the pressing force to maintain optimal braking performance across different operating conditions.
Solution Approach 2:
The patent applies feedback by using the descent speed information to regulate the pressing force. The pressing force applying portion receives feedback about the descent speed and adjusts the pressing force accordingly, ensuring that the braking force remains consistent while preventing excessive deceleration. This feedback mechanism allows the system to maintain braking force consistency without over-braking.
4Device complexity
If a wedge-shaped damper configuration is used to generate braking force, then the braking mechanism is simplified, but the device complexity and weight are increased
Solution Approach 1:
The patent applies the extraction principle by separating the pressing force generation function from the braking force generation function. The pressing force applying portion is extracted as a distinct component that generates pressing force independently, while the damper focuses on generating braking force through friction. This separation allows the system to achieve simplified braking mechanism while reducing the weight of the overall safety device.
Solution Approach 2:
The patent applies multi-functionality by designing the pressing force applying portion to serve multiple purposes: generating pressing force, regulating pressing force based on descent speed, and stabilizing braking force. This multi-functional component reduces the need for additional weight-bearing structures, thereby simplifying the overall braking mechanism while maintaining effective braking performance.
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 suppresses fluctuations in braking force and deceleration rate, ensuring consistent braking performance while reducing the size and weight of the safety device, thereby enhancing electric power utilization efficiency.
Implementation Method 1
a first sliding surface 23a on a surface on an opposite side from the guide rail 8, and that is pressed against the guide rail 8 to generate a braking force; a movable member 22 that is disposed on a side of the damper 23 near the first sliding surface 23a, and that includes a second sliding surface 22a that contacts the first sliding surface 23a
Implementation Method 2
an elastic body 24, and a pressing force applying portion 21 that generates a pressing force F1
Implementation Method 3
pressed against the guide rail 8 to generate a braking force
Data Source
AI summary
An elevator emergency safety device includes: a damper that includes a first sliding surface, and that is pressed against a guide rail to generate a braking force; a movable member that includes a second sliding surface that contacts the first sliding surface; and an elastic body that applies to the first sliding surface a pressing force that presses the damper against the guide rail, wherein: the damper is configured so as to be movable in a vertical direction relative to the movable member by the first and second sliding surfaces sliding; and the elastic body is configured such that the pressing force F1 increases, reaches a maximum value, and then decreases, as a position of a contacting portion between the first and second sliding surfaces moves upward.