Elevator Rope Inner Layer Strand Design
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Solution Overview
Problem
Conventional elevator ropes face issues with fiber core melting and breakage due to heat, structural gaps leading to deformation and diameter reduction, increased contact pressure causing abrasion and wire breakages, and insufficient cross-sectional area for rope grease.
Innovation Solution
An elevator rope design featuring a fiber core with a plurality of steel inner layer strands twisted around it, coated with a resin layer, and additional steel outer layer strands, where the inner layer strands have a smaller diameter and greater number than the outer layer strands, providing protection and maintaining cross-sectional area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a core rope is constituted by fibers and coated with a resin coating body, then the core rope provides flexibility and rope grease impregnation, but the fibers may melt and break due to heat from the molding machine
Solution Approach 1:
An inner layer strand acts as an intermediary protective barrier between the fiber core and the resin coating body. This inner layer strand shields the fiber core from direct contact with hot resin during the coating process, preventing fiber melting and breakage while allowing the resin coating to be applied successfully.
Solution Approach 2:
The inner layer strand is placed around the fiber core before the resin coating process to provide advance protection. This pre-positioned protective layer cushions the fiber core against thermal damage from the molding machine, ensuring fiber integrity before the harmful heat exposure occurs.
2Device complexity
If the core rope is not tightened except during twisting, then the structure remains simple, but structural gaps remain causing deformation and diameter reduction due to extensive use
Solution Approach 1:
The rope structure is segmented into multiple functional layers: an inner layer strand directly surrounding the fiber core, and an outer layer strand surrounding the inner layer. This segmentation allows the inner layer to specifically address core tightening and shape stability, while the outer layer provides additional structural support and protection.
Solution Approach 2:
The rope structure employs a nested configuration where the inner layer strand is positioned inside the outer layer strand, both surrounding the fiber core. This nested arrangement enables the inner layer to tightly conform to and stabilize the fiber core, preventing deformation and diameter reduction while maintaining overall structural integrity.
3Quantity of substance
If the cross-sectional area of the fiber core is increased to ensure sufficient rope grease content, then rope grease capacity improves, but the overall rope diameter increases
Solution Approach 1:
The inner layer strand has a smaller diameter than the outer layer strand, creating a localized structure that maximizes the cross-sectional area available for rope grease impregnation within the fiber core. This local optimization ensures sufficient grease capacity without unnecessarily increasing the overall rope diameter.
Solution Approach 2:
By changing the diameter parameter of the inner layer strand to be smaller than the outer layer strand, the design optimizes the space available for rope grease storage in the fiber core. This parameter adjustment ensures adequate grease content while controlling the overall rope dimensions.
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 design enhances the service life of elevator ropes by preventing fiber core breakage, reducing deformation, and ensuring sufficient rope grease content, while minimizing unit mass and manufacturing complexity.
Implementation Method 1
a plurality of steel inner layer strands that are twisted together on an outer circumference of the fiber core
Implementation Method 2
a resin inner layer rope coating body that is coated onto an outer circumference of the inner layer strands
Implementation Method 3
a plurality of steel outer layer strands that are twisted together on an outer circumference of the inner layer rope
Data Source
Figure 1
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AI summary
In an elevator rope, a plurality of steel outer layer strands are twisted together on an outer circumference of an inner layer rope. The inner layer rope has: a fiber core; a plurality of steel inner layer strands that are twisted together directly onto an outer circumference of the fiber core; and a resin inner layer rope coating body that is coated onto the outer circumference. A diameter of the inner layer strands is smaller than a diameter of the outer layer strands. The inner layer strands are greater in number than the outer layer strands.