Elevator Compensation Rope Guard with Segmented Dividers
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Solution Overview
Problem
Traction-based elevator systems experience rope sway issues, particularly in high-rise buildings, where compensation ropes may jump out of their grooves and become entangled, necessitating frequent maintenance.
Innovation Solution
The elevator compensation assembly features a compensation sheave with flanges and dividers on the outer surface and inner guard, creating spaces to contain the ropes, preventing entanglement by maintaining proper positioning even under sway conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If compensation ropes are constrained in grooves on the compensation sheave, then the ropes can be guided and positioned, but under sway conditions the ropes may jump out of the grooves and become entangled
Solution Approach 1:
The compensation sheave is segmented into multiple grooves, each dedicated to guiding and containing a specific compensation rope. This segmentation ensures that each rope remains in its designated path and prevents lateral movement that could lead to entanglement during sway conditions.
Solution Approach 2:
A guard structure is introduced as an intermediary element between the compensation ropes and the external environment. The guard includes dividers that extend into the grooves to provide additional containment, acting as a mediator that prevents the ropes from jumping out while maintaining their guided movement.
2Device complexity
If the compensation assembly uses simple grooves without additional containment structures, then the device complexity is reduced, but the ropes may sway and become entangled requiring maintenance
Solution Approach 1:
The guard is segmented into multiple dividers, each corresponding to a groove and a compensation rope. This segmentation provides targeted containment for each rope without requiring a completely enclosed structure, thus maintaining relative simplicity while improving reliability.
Solution Approach 2:
The dividers on the guard provide localized containment only where needed - within the grooves where the ropes are positioned. This local quality approach ensures rope containment stability without adding complex structures throughout the entire assembly, balancing simplicity and reliability.
3Reliability
If dividers extend far from the sheave surface, then rope containment is improved, but the device complexity and potential interference with rope movement increases
Solution Approach 1:
The dividers are designed with optimized parameters - their extension distance from the sheave surface is carefully controlled to provide sufficient containment while maintaining clearance for normal rope movement. This parameter optimization ensures reliable rope containment without excessive structural complexity or interference with operational movement.
Data Source
AI summary
An illustrative example embodiment of an elevator compensation assembly includes at least one compensation sheave having an outer surface configured to engage a plurality of compensation rope members. A guard has an inner surface situated adjacent the outer surface of the compensation sheave. A plurality of dividers that extend away from at least one of the outer surface of the compensation sheave or the inner surface of the guard. The dividers establish a space between adjacent ones of the dividers for accommodating a compensation rope member.