Elevator Rope Resin Coating for High Packing Density
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Solution Overview
Problem
Conventional elevator ropes face challenges in maintaining packing density while preventing damage to core rope and steel strands as the rope diameter increases, requiring high pressing forces that can lead to surface damage and reduced strength and service life.
Innovation Solution
The elevator rope manufacturing method involves coating a core rope strand with a resin core rope coating body and passing it through a heated die to integrate the strands, allowing for increased packing density without damaging the core rope or steel strands, even at larger diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the diameters of core rope strands are increased to ensure packing density, then packing density is improved, but large pressing force is necessary which may damage steel strands and core rope fibers
Solution Approach 1:
The invention changes the physical state of the core rope by heating it to a specific temperature range (50°C to 100°C), which modifies the properties of the fiber bundles and allows for increased packing density without requiring excessive pressing force that would cause damage
Solution Approach 2:
The core rope is pre-heated before the stranding process with steel strands. This preliminary thermal treatment prepares the fiber bundles to be more compliant and easier to compact, enabling high packing density to be achieved during stranding without applying damaging pressing forces
2Manufacturing precision
If pressing force is increased to control rope diameter during stranding, then rope diameter control is improved, but surfaces of steel strands and fibers of core rope may be damaged
Solution Approach 1:
By changing the temperature parameter of the core rope to 50°C-100°C, the fiber bundles become more pliable and responsive to compression, allowing precise diameter control during stranding with minimal pressing force, thereby preventing surface and fiber damage
Solution Approach 2:
Heat acts as an intermediary that mediates between the pressing force and the core rope structure. The thermal energy softens the fiber bundles, allowing them to conform to compression forces without damage, thus enabling precise diameter control with reduced mechanical stress
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 method effectively increases packing density while preventing damage to the core rope and steel strands, maintaining rigidity and reducing fretting wear, while also ensuring adequate lubrication and maintaining the core rope's oil content.
Implementation Method 1
forming a core rope coating body by passing the core rope through a heated die to integrate the core rope strand coating bodies in which the core rope strands are coated separately
Data Source
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AI summary
In an elevator rope, a resin core rope coating body is coated onto an outer circumference of a core rope that is constituted by a fiber bundle. A plurality of steel strands are stranded onto an outer circumference of the core rope coating body.