Variable-Density Elevator Compensation Cables for Frame Moment Control
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Solution Overview
Problem
In rope and belt elevator systems, using compensation chains with different densities can generate moments on the structural frame and cause excessive pressure on car shoes or rollers when the car or counterweight is at the top of the hoistway.
Innovation Solution
The elevator system employs compensation cables with segments of varying densities arranged such that adjacent segments in each cable increase in opposite directions, maintaining a consistent average density between 1 and 2 kg/m, and the ratio of drive belt, travel cable, and compensation cable densities is maintained within 0.8 to 1.2, ensuring balanced mass distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compensation chains with different densities are used, then traction is ensured when the car or counterweight are on the top of the hoistway, but moments are generated on the structural frame and excessive pressure is generated within the car shoes or rollers
Solution Approach 1:
The compensation cable is divided into multiple segments with different densities along its length. Each segment has a specific density tailored to compensate for the varying weight of the elevator car at different positions in the hoistway, ensuring optimal traction while maintaining balanced mass distribution to minimize moments on the structural frame.
Solution Approach 2:
The density parameter of the compensation cable is varied along its length to match the changing weight requirements of the elevator system. By adjusting the density parameter locally in different segments, the system achieves reliable traction at all positions without generating excessive moments or pressure on structural components.
2Reliability
If compensation chains with different densities are used, then traction is ensured when the car or counterweight are on the top of the hoistway, but excessive pressure is generated within the car shoes or rollers
Solution Approach 1:
The compensation cable features segments with locally optimized densities that correspond to the weight distribution requirements at different hoistway positions. This local quality variation ensures adequate traction force where needed while preventing excessive pressure concentration on car shoes and rollers.
Solution Approach 2:
The density parameter of the compensation cable is continuously adjusted along its length to match the varying load conditions. This parameter change strategy ensures that the cable provides sufficient traction force when the car is at the top while avoiding excessive pressure on contact surfaces.
3Object-affected harmful factors
If segments with varying densities are arranged in compensation cables, then mass distribution is optimized and moments are minimized, but the cable structure becomes more complex
Solution Approach 1:
The compensation cable is divided into discrete segments with different densities, each segment contributing to the overall mass distribution optimization. This segmentation allows for controlled variation in density while maintaining a manageable structural configuration that can be manufactured and installed using standard techniques.
Data Source
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.