RFID Pre-Failure Warning Indicators for Roundslings
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Solution Overview
Problem
Industrial slings, particularly synthetic roundslings, often fail due to overload or fatigue, leading to inconsistent and unreliable pre-failure indicators, posing a risk to operators as the damage may not be readily apparent, especially with the load-bearing core hidden inside the outer cover.
Innovation Solution
The implementation of an RFID-based pre-failure warning system in roundslings, which includes a load-bearing core, an indicator yarn with RFID tags, and sensors that send wireless signals to a receiver, alerting users through audible, visible, or tactile alarms when the sling is overstretched or overloaded, using a dedicated strand with rings that fail at a lower load capacity than the core, ensuring timely notification before sling failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pre-failure indicators are used in roundslings, then they provide some warning capability, but they are inconsistent and unreliable in indicating sling damage
Solution Approach 1:
The patent replaces traditional mechanical pre-failure indicators (visual tags, color-coded elements) with an RFID-based detection system. The RFID tags are attached to the load-bearing core and readers scan for their presence, providing electronic detection instead of mechanical/visual indication. This substitution enables more reliable and consistent damage detection throughout the sling's service life.
Solution Approach 2:
The system implements continuous feedback by placing multiple RFID tags along the load-bearing core and using readers to scan for their presence. When tags are missing or malfunctioning, the system provides immediate feedback about potential damage or wear, allowing operators to assess sling integrity systematically rather than relying on intermittent visual checks.
2Object-affected harmful factors
If the load-bearing core is hidden inside the outer cover for protection, then the core is protected from environmental damage, but damage to the core is not readily apparent to operators
Solution Approach 1:
The patent replaces visual inspection methods with RFID electronic detection. RFID tags are attached to the load-bearing core inside the cover, and readers can scan for these tags through or near the cover material. This allows operators to detect core integrity issues without needing to visually inspect the hidden core, maintaining environmental protection while enabling damage detection.
Solution Approach 2:
The RFID tags serve as intermediaries between the hidden load-bearing core and the operator. Instead of directly observing the core, operators use readers to detect the presence and status of RFID tags, which indirectly indicate core integrity. This intermediary system bridges the gap between the protected hidden core and the need for damage detection.
3Reliability
If RFID tags are attached to the load-bearing core, then consistent and reliable pre-failure warnings are provided, but the device complexity increases
Solution Approach 1:
The patent extracts the detection function from complex mechanical indicator systems and implements it through simple RFID tags and readers. The RFID tags are minimal electronic components attached to the core, and readers are portable handheld devices. This extraction simplifies the overall system by using well-established RFID technology rather than complex custom-built mechanical or electronic indicator mechanisms.
Solution Approach 2:
The RFID system serves multiple functions: it tracks the sling's service life, detects core integrity issues, and provides pre-failure warnings. The same RFID infrastructure can be used across different sling types and applications, providing universal applicability. This multi-functionality justifies the added complexity by delivering comprehensive monitoring capabilities from a single integrated system.
4Measurement precision
If multiple RFID tags are distributed along the sling, then comprehensive monitoring of the entire sling is achieved, but the manufacturing cost and complexity increase
Solution Approach 1:
The patent segments the monitoring function by placing multiple RFID tags at different locations along the load-bearing core. Each tag independently monitors its local section, allowing precise identification of where damage or wear has occurred. This segmentation enables targeted inspection and replacement of only the affected sling sections rather than requiring complete sling replacement.
Solution Approach 2:
The RFID tags are pre-attached to the load-bearing core during manufacturing, establishing the monitoring infrastructure before the sling enters service. This preliminary action ensures that the monitoring system is already in place and functional from the first use, eliminating the need for post-manufacturing installation and ensuring consistent monitoring throughout the sling's service life.
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 RFID-based warning system provides consistent and reliable alerts, allowing operators to take corrective action before the sling fails, thereby ensuring safety and preventing accidents by clearly indicating when the sling has been overstretched or overloaded.
Implementation Method 1
an indicator yarn comprising at least one radio frequency identification (RFID) tag affixed to the indicator yarn, and one or more RFID sensors comprising a transmitter for sending a wireless signal to a RFID signal receiver
Data Source
AI summary
Roundslings with radio frequency identification pre-failure warning indicators comprise radio frequency identification tags, radio frequency identification tag sensors, and radio frequency signal receivers that inform a user of a pre-failure condition with the roundsling. The radio frequency tags may be affixed to one or more of an indicator yarn, a strand of the roundsling core, a dedicated strand of a pre-failure indicator assembly, or a ring of the pre-failure indicator assembly. The radio frequency tags may be active or passive, and active radio frequency tags may comprise a shield that block a signal transmitted from the tag.