Single-Cable Twisting with Torsion Relief for Stable Lay Length
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Solution Overview
Problem
Existing cable bundle twisting methods result in inconsistent lay lengths and untwisting tendencies, leading to quality issues and potential torsional forces, especially in cables with small strand cross sections.
Innovation Solution
A method involving separate holding of first cable ends and joint rotation of second cable ends about the twisting axis, with first ends rotated in the same direction as the joint rotation to relieve torsion, and a device with individual rotating units and a twisting unit arranged parallel to the twisting axis to maintain consistent lay length and reduce untwisting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the twisting process is continued farther than necessary for the desired lay length and number of lays (over-twisting), then the elastic deformation of the cable bundle is reduced, but high torsional forces occur which can be unwanted or inadmissible
Solution Approach 1:
The patent applies preliminary anti-action by performing a back-twisting operation after the main twisting process. The twisting head rotates in the opposite direction to the strand twisting direction, creating a counteracting torsional force that reduces the elastic deformation and residual stresses without requiring excessive twisting in the primary direction. This prevents the accumulation of high torsional forces while still achieving the desired cable bundle stability.
2Manufacturing precision
If the cable bundle is twisted to achieve desired lay length and number of lays, then the cable bundle structure is formed, but the cable bundle tends to untwist again counter to the twisted state, causing variation in lay length and number of lays
Solution Approach 1:
The patent performs a back-twisting operation after the main twisting process to counteract the untwisting tendency. By rotating the twisting head in the opposite direction to the strand twisting direction, the method creates a compensating effect that stabilizes the cable bundle structure and maintains the desired lay length and number of lays throughout the cable bundle length.
Solution Approach 2:
The patent changes the rotation direction parameter of the twisting head during the twisting process. After completing the required number of lays and achieving the desired lay length, the twisting head reverses its rotation direction, transforming from twisting in the same direction as the strands to twisting in the opposite direction. This parameter change enables the reduction of untwisting tendency while maintaining manufacturing precision.
3Force
If separate holding of first cable ends and joint rotation of second cable ends is performed, then torsional forces are reduced, but the device complexity increases due to individual rotating units
Solution Approach 1:
The patent segments the cable ends into two groups with different holding and rotation characteristics. The first cable ends are held in a rotationally fixed manner relative to the twisting head, while the second cable ends are subjected to joint rotation about the twisting axis. This segmentation allows for reduced torsional forces in the cables while maintaining a manageable device structure through functional differentiation of the holding units.
Data Source
AI summary
A method and a device twist single cables about a twisting axis. The single cables each run along a cable axis and have wires, which are twisted in a strand twisting direction to form a strand, and also each have a first cable end and a second cable end. The first cable ends are held separately by a single rotating unit in each case. The second cable ends are held by a twisting unit. The second cable ends are rotated jointly about the twisting axis counter to the strand twisting direction to produce a twisted cable bundle. During the joint rotation, the first cable ends are rotated separately about a cable axis of the respective single cable, in the same rotation direction as the joint rotation. The single cables are each relieved of torsion thereby.