Pulling Swivel Load-Rotation Testing for Failure Certification
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Solution Overview
Problem
Existing swivels used in high-tension power transmission and lifting applications often degrade in performance, making it difficult to differentiate between functional and failing swivels, especially under high tension loads, leading to potential catastrophic failures.
Innovation Solution
A method and apparatus for testing swivels involve applying alternating tension and rotational forces, monitoring torque and rotation, and using a controller to determine swivel failure based on predetermined thresholds, with a test platform incorporating hydraulic and rotational systems to simulate real-world conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If visual inspection and low-load testing are used to assess swivel functionality, then the testing process is simple and quick, but the test cannot detect performance degradation that occurs under high tension loads
Solution Approach 1:
The testing method changes the operational parameters by applying high tension loads (up to 125% of rated working load) combined with rotational forces, rather than relying on visual inspection or low-load static tests. This parameter change enables detection of performance degradation that only manifests under actual operating conditions.
Solution Approach 2:
The test transitions from static visual inspection to dynamic operational testing by applying simultaneous tension and rotation. This dynamic approach simulates real-world cable pulling conditions where swivels must rotate while under tension, revealing performance issues that static tests cannot detect.
2Reliability
If high tension loads are applied during testing to simulate real operating conditions, then the test can detect performance degradation, but the risk of catastrophic failure increases
Solution Approach 1:
The test applies progressively increasing tension loads up to 125% of the rated working load in a controlled manner before actual field use. This preliminary stress testing identifies potential failure points and performance degradation before the swivel is deployed in service, preventing catastrophic failures during actual cable pulling operations.
Solution Approach 2:
The test deliberately subjects the swivel to high tension loads that could cause failure, but in a controlled testing environment where failure can be detected and recorded. This converts the potential harm of failure into a beneficial diagnostic tool, allowing identification of defective swivels before they cause dangerous failures in actual use.
3Device complexity
If swivels are tested under static conditions without rotation, then the testing apparatus is simpler, but the test cannot evaluate the swivel's ability to rotate under tension
Solution Approach 1:
The testing apparatus combines multiple functions in one system: it applies tension loads through hydraulic actuators while simultaneously applying rotational forces through motorized drives. This multi-functional device can test both the structural integrity and rotational performance of swivels under combined loading conditions, providing comprehensive functional assessment.
Solution Approach 2:
The test maintains continuous application of both tension and rotation simultaneously throughout the testing period. This continuous combined loading ensures that the swivel's rotational mechanism is evaluated under the same conditions it will experience during actual cable pulling operations, providing accurate functional assessment.
Data Source
AI summary
Systems and methods for testing and certifying swivels such as are used for line and cable pulling are disclosed. The disclosed systems and methods for testing and certification may be used to ensure the tested swivels are still suitable for use in industrial settings. Devices for performing the described testing procedures are also disclosed herein.