Elevator Rope Fiber Core Design for Mass Reduction
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Solution Overview
Problem
Conventional elevator ropes with steel cores face issues of increased mass, fiber breakage, deformation, and structural gaps due to limited rope grease and non-tightened configurations, leading to abrasion and wire breakages.
Innovation Solution
An elevator rope design featuring a fiber core with inner layer strands twisted around a resin coating and steel outer layer strands, where the inner layer strands have a central fiber core and twisted steel wires, reducing mass and preventing fiber breakage and deformation while ensuring sufficient rope grease content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a steel core rope configuration is used to maximize strength, then rope strength is improved, but mass increases and rope grease content is limited
Solution Approach 1:
The invention uses a composite core structure combining steel wires and fiber strands. The core rope includes steel core strands and fiber core strands twisted together, creating a composite material structure that optimizes both strength and weight characteristics, allowing sufficient rope grease content while maintaining required strength levels.
Solution Approach 2:
The invention applies different material properties to different parts of the core rope. Steel core strands provide strength in specific regions while fiber core strands provide lightweight properties in other regions, creating local quality variations that resolve the contradiction between overall strength and mass reduction.
2Weight of moving object
If a fiber core rope configuration is used, then mass is reduced, but fibers may melt and break due to heat from molding machine
Solution Approach 1:
The invention incorporates a resin core rope coating body that coats the outer circumference of the core rope before the fiber core is exposed to molding machine heat. This coating layer acts as a protective barrier, cushioning the fiber core from thermal damage during the coating process and preventing fiber melt and breakage.
Solution Approach 2:
The resin core rope coating body serves as an intermediary protective layer between the molding machine heat source and the fiber core. This intermediate layer absorbs or shields the thermal energy, preventing direct heat transfer to the fiber core and avoiding fiber degradation.
3Device complexity
If core rope is not tightened during manufacturing, then manufacturing complexity is reduced, but structural gaps remain causing deformation and diameter reduction over time
Solution Approach 1:
The invention applies compressive forces at a level that causes deformation during the strand twisting process itself, tightening the core rope structure in advance. This preliminary tightening action eliminates structural gaps before the rope enters service, preventing future deformation and diameter reduction without requiring additional manufacturing steps.
Solution Approach 2:
The invention introduces dynamic compressive forces during the twisting process to tighten the core rope structure. The application of deformation-level compressive forces creates a dynamically adjusted tight structure that maintains stability over time, transforming the static core rope into a dynamically optimized structure.
4Stability of the object's composition
If compressive forces causing deformation are applied during strand twisting, then core rope tightness is improved, but manufacturing complexity increases
Solution Approach 1:
The invention merges the strand twisting operation with the core rope tightening operation. The same twisting process that forms the steel strands also applies the necessary compressive forces to tighten the core rope structure, combining two functions into one manufacturing step and avoiding additional complexity.
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 design effectively suppresses mass increase, fiber breakage, and deformation, while maintaining adequate rope grease, reducing abrasion and extending the rope's service life by minimizing structural gaps and contact pressure.
Implementation Method 1
a plurality of steel inner layer strands that are twisted together on an outer circumference of the inner layer rope fiber core
Implementation Method 2
a plurality of steel outer layer strands that are twisted together on an outer circumference of the inner layer rope
Implementation Method 3
a resin inner layer rope coating body that is coated onto an outer circumference
Implementation Method 4
compressive forces at a level that is accompanied by deformation are applied when the strands are twisted together
Data Source
AI summary
In an elevator rope, an inner layer rope has: an inner layer rope fiber core; a plurality of inner layer strands; and a resin inner layer rope coating body that is coated onto an outer circumference. Inner layer strands are twisted together on an outer circumference of the inner layer rope fiber core. The inner layer strands have: an inner layer strand fiber core that is disposed centrally; and a plurality of steel inner layer strand wires that are twisted together on an outer circumference of the inner layer strand fiber core. In addition, a plurality of steel outer layer strands are twisted together on an outer circumference of the inner layer rope.