Automatic Rope Tension Equalizer for Elevator Systems
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Solution Overview
Problem
Elevator systems with multiple ropes face issues of uneven tension due to differences in expansion rates, lengths, misalignment, and improper installation, leading to premature wear and the need for replacing all ropes when one reaches its maximum load capacity, resulting in unnecessary expense and waste.
Innovation Solution
An automatic rope tension equalizer system using a hitch plate, plungers, and cam assemblies connected by a fluid network that equalizes pressure and tension across multiple ropes, ensuring real-time load measurement and vibration damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ropes are initially established or exchanged, then the system can operate with new ropes, but it is difficult to precisely match the lengths of the ropes with each other due to bending structure and rigidity, causing length differences and uneven tension to occur again
Solution Approach 1:
The patent employs adjustable length mechanisms that allow the effective length of each rope to be modified independently. By changing the parameter of rope length through adjustment devices (such as turnbuckles, telescopic sections, or adjustable anchors), the system can compensate for initial length differences and achieve uniform tension across all ropes, resolving the contradiction between reliability and ease of manufacture.
2Reliability
If one rope reaches its maximum load capacity, then all ropes in the system are replaced, but this leads to unnecessary expense and waste since other ropes may still have service life remaining
Solution Approach 1:
The patent implements independent tension control for each rope through separate adjustment mechanisms and monitoring systems. This segmentation allows each rope to be managed independently, so when one rope reaches its maximum load capacity or shows signs of wear, only that specific rope needs to be replaced rather than the entire set. This maintains safety through continuous monitoring while eliminating the waste of replacing still-serviceable ropes.
3Manufacturing precision
If ropes have different lengths, then the load is unevenly applied to the ropes, but the ropes have different expansion rates and wear patterns that further exacerbate the tension imbalance
Solution Approach 1:
The patent employs dynamic tension adjustment mechanisms that can adapt to changing rope conditions in real-time. Rather than relying solely on precise initial manufacturing, the system uses adjustable components (such as hydraulic actuators, screw mechanisms, or adjustable clamps) that allow the tension in each rope to be dynamically modified. This enables compensation for differential expansion rates and wear patterns, maintaining reliable tension distribution even when ropes have slightly different lengths or expansion characteristics.
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 system effectively equalizes rope tension, prolongs the lifespan of ropes, reduces waste by allowing individual rope replacement, and minimizes operational costs by maintaining consistent load distribution and reducing vibration.
Implementation Method 1
A network connects each cavity to each other cavity, and fluid in the network automatically equalizes pressure on the first and second plungers
Implementation Method 2
Each cam assembly has a cam and a rod extending therefrom. The cam of the first cam assembly engages the first plunger, and the cam of the second cam assembly engages the second plunger
Data Source
AI summary
An automatic rope tension equalizer system includes first, second, and third plungers, first, second, and third cam assemblies, and a hitch plate with first, second, and third cavities. The first, second, and third plungers are at least partially situated in the first, second, and third cavities, respectively. Each cam assembly has a cam and a rod extending therefrom. The cam of the first cam assembly engages the first plunger, the cam of the second cam assembly engages the second plunger, and the cam of the third cam assembly engages the third plunger. A network connects each cavity to each other cavity, and fluid in the network automatically equalizes pressure on the first, second, and third plungers, thereby affecting positioning of the first, second, and third plungers and, through each cam, tension on each rod.