Variable-Density Elevator Compensation Cables to Reduce Frame Moments
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Solution Overview
Problem
The use of compensation chains with different densities in elevator systems generates moments on the structural frame and excessive pressure on car shoes or rollers, leading to potential damage and reduced ride quality.
Innovation Solution
Employ compensation cables with uniform cable lengths and segments having varying segment densities, arranged such that adjacent segments in opposite cables increase or decrease density in opposite directions, maintaining an average density between 1 and 2 kg/m and balancing the mass distribution to minimize moments and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compensation chains with different densities are used, then traction is ensured when car or counterweight are on top of hoistway, but moments are generated on structural frame and excessive pressure is generated within car shoes or rollers
Solution Approach 1:
The compensation chain is divided into multiple segments with different densities. Each segment has a specific density (first density, second density, third density) arranged in sequence along the chain. This segmentation allows the chain to provide necessary traction while distributing mass to minimize harmful moments and pressures on the structural frame and car shoes.
Solution Approach 2:
Different portions of the compensation chain are assigned different densities. The first segment has a first density, the second segment has a second density, and the third segment has a third density. This local variation in density optimizes the chain's performance by providing traction where needed while minimizing harmful effects on the structural frame and car components.
2Ease of manufacture
If uniform density compensation chains are used, then mass distribution is simple, but traction performance when car or counterweight are on top of hoistway is insufficient
Solution Approach 1:
The compensation chain is segmented into multiple portions with different densities. This segmentation enables the chain to achieve optimal traction performance when the car or counterweight is positioned at the top of the hoistway, while maintaining manufacturability through standardized segment construction.
Solution Approach 2:
Different segments of the compensation chain are assigned different densities optimized for traction performance. The first, second, and third segments have progressively different densities that enhance the chain's ability to provide reliable traction while keeping the overall design manufacturable.
3Object-affected harmful factors
If variable density segments are used in compensation chains, then mass distribution is optimized to minimize moments and pressure, but manufacturing complexity increases
Solution Approach 1:
The compensation chain is divided into discrete segments with specified densities. This segmentation approach optimizes mass distribution to minimize harmful moments and pressures while maintaining manufacturing feasibility through modular construction. Each segment can be manufactured separately and then assembled.
Solution Approach 2:
Different density values are assigned to different segments (first density, second density, third density) to optimize the chain's mechanical performance. This localized optimization reduces harmful forces on the structural frame and car components while keeping the manufacturing process manageable through standardized segment design.
Data Source
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AI summary
An elevator system, having: an elevator car; a counterweight; compensation cables connecting the elevator car to the counterweight, wherein the compensation cables have a same cable length as each other and each extends from a first end to a second end, wherein the compensation cables are each divided into segments, and each of the segments has a same segment length as each of the other segments, and wherein, in each of the compensation cables, adjacent ones of the segments have a segment density that differs from each other.