Textile Rope Core Sheath Design for Torsional Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ropes in applications with diagonal pull tend to untwist or twist due to lack of torsional rigidity, leading to load redistribution among elements and reduced service life, especially in rotation-resistant ropes.
Innovation Solution
A core/sheath rope design with a stranded or braided core made of textile fiber material, where the core is wound with a tension element in a non-positive manner to minimize twisting, and strategically placed gaps between windings to enhance flexibility and prevent twisting during diagonal pull.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the rope is made rotation-free with balanced strand layers, then torsional rigidity is improved, but the rope still twists under oblique tension due to load redistribution between strand layers
Solution Approach 1:
The rope is segmented into distinct functional layers: an inner core layer and an outer strand layer, each with different construction characteristics. The inner core provides structural stability while the outer strands handle load bearing, preventing the twist-induced load redistribution that occurs in traditionally balanced constructions.
Solution Approach 2:
The rope employs a composite construction combining different fiber materials with distinct properties. The inner core uses high-modulus fibers for dimensional stability, while the outer strands use high-strength fibers for load bearing. This material differentiation allows the rope to resist twisting while maintaining reliability under oblique tension.
2Ease of operation
If the rope elements are arranged in a helix shape, then flexibility is improved, but the rope twists under load when not rigidly fixed
Solution Approach 1:
The rope construction dynamically adapts to loading conditions through its layered structure. Under normal tension, the helical strands provide flexibility. Under oblique tension, the tighter inner core becomes actively engaged to resist twisting, creating a dynamic response that maintains both flexibility and stability.
Solution Approach 2:
The rope utilizes parameter changes in the form of different lay directions and tightness between inner core and outer strands. The inner core has a tighter construction for stability, while the outer strands have a looser construction for flexibility. This parameter differentiation resolves the contradiction between flexibility and twist resistance.
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a rope made of textile fiber material for applications in which oblique pulling can occur, characterized in that the rope is a core-and-sheath rope, the core (1) and sheath of which are substantially made of textile fiber material, the core (1) of which is stranded, and which has a friction-locking winding of a tension element (2, 2', 2'') between the core (1) and the sheath.