Load-Activated Cable Rotation Blocking for Hoisting Strength
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Solution Overview
Problem
Rotation-resistant cables fail to maintain perfect torque balance under high loads, leading to cable rotation and reduced breaking strength, while existing solutions that block cable ends to achieve maximum strength are not operational due to the need for free swiveling during hoisting.
Innovation Solution
A Cable Rotation Blocking System (CRBS) with distinct sections that allow rotation or axial movement based on load thresholds, using a combination of internal and external bodies, ledges, and spring washers to prevent rotation when loads exceed a certain threshold, ensuring even load distribution and maximum breaking strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cable ends are blocked to achieve maximum strength, then cable breaking strength is improved, but the cable cannot swivel freely during hoisting operations
Solution Approach 1:
The patent applies the dynamics principle by creating a system that automatically changes its state based on load conditions. The rotation blocking mechanism is designed to be dynamic rather than static - it allows rotation during normal operations and only blocks rotation when the load reaches a predetermined threshold level, thus adapting the cable end behavior to the operational requirements at different load stages
Solution Approach 2:
The patent implements parameter changes by utilizing the relationship between load magnitude and rotation blocking. The system changes its mechanical state (from allowing rotation to blocking rotation) based on the parameter change of load weight. When the load parameter exceeds a predetermined threshold, the blocking mechanism activates, thereby changing the rotational parameter of the cable end from free to constrained
2Stability of the object's composition
If rotation-resistant cables are used with inner and outer strands wound in opposite directions, then torque balance is improved, but rotation resistance is not perfect under high loads
Solution Approach 1:
The patent applies the extraction principle by isolating the rotation blocking function from the cable structure itself and implementing it as a separate, dedicated mechanism. Rather than relying solely on the cable's internal strand configuration for rotation resistance, the system extracts the rotation control function into an independent blocking mechanism that activates only when needed, thereby supplementing and enhancing the cable's inherent rotation resistance
Solution Approach 2:
The patent implements the intermediary principle by introducing a rotation blocking mechanism that acts as a mediator between the cable and the load. This intermediary component monitors the load condition and intervenes only when rotation becomes problematic under high load, providing additional rotation resistance without interfering with the cable's normal operation or torque balance characteristics
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 CRBS significantly enhances cable performance by maintaining maximum strength under ultimate load tests while allowing free swiveling during normal operations, increasing the cable's breaking strength by at least 25% compared to traditional systems.
Implementation Method 1
a first spring washer and a second spring washer positioned between an outer surface of the internal body and a surface of the shim washer so as to be compressible in an axial direction between a lip and the surface of the shim washer upon axial movement of the internal body in the direction of the force along the axis X
Data Source
AI summary
A cable rotation blocking system (CRBS) (300) is described herein. The CRBS extends along an axis X between a first end (305) and a second end (303), and comprises a first section provided at the first end (305), the first section being configured to be connectable to a cable (100). The CRBS further comprises a second section provided at the second end (303), the second section being configured to be attachable to a load. With the CRBS described herein, when no load, or a load up to an upper load threshold is attached to the second section, the second section is rotatable about the axis X, relative to the first section, however, when a load higher than the upper load threshold is attached to the second section, the second section is prevented from rotation about the axis relative to the first section.