Hoist Hook Mechanical Overload Detection via Belleville Spring Switch
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Solution Overview
Problem
Current overload detection systems for hoists, particularly in severe environmental conditions, are inaccurate and unreliable due to their dependence on electrical systems, which are vulnerable to environmental factors and limited by battery power, leading to difficulties in detecting loads and overload conditions at the hook.
Innovation Solution
A mechanical overload detection system using a binary switch and Belleville springs, where the switch is triggered by load-induced deformation and retained in the triggered state until manually reset, allowing for precise overload detection without relying on electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical-based overload detection systems are used at the hook, then overload conditions can be detected, but the system becomes vulnerable to severe environmental conditions and limited by battery power
Solution Approach 1:
The patent replaces electrical-based overload detection systems with a purely mechanical detection system. The mechanical system uses a binary switch that is triggered by load-induced deformation of the hoist assembly, eliminating dependence on batteries and electrical components that are vulnerable to severe environmental conditions.
Solution Approach 2:
The mechanical overload detection system is self-activating through the natural deformation of the hoist assembly under load. The binary switch automatically triggers when the assembly deforms beyond a predetermined amount, requiring no external power source or complex electronics to detect overload conditions.
2Object-affected harmful factors
If mechanical overload detection systems are used, then environmental vulnerability is reduced, but the system complexity increases
Solution Approach 1:
The overload detection function is segmented into distinct mechanical components: the hoist assembly structure itself, the binary switch mechanism, and the retention system. This segmentation allows each component to perform its specific function simply, avoiding the need for complex integrated electrical systems while maintaining detection capability.
3Reliability
If overload detection is implemented, then hoist system safety is improved, but the detection accuracy in severe environments deteriorates
Solution Approach 1:
The patent replaces electrical-based measurement systems with a mechanical binary switch that directly responds to physical deformation of the hoist assembly. This mechanical approach provides accurate overload detection in severe environments by relying on fundamental mechanical principles rather than electrical signals that can be corrupted by environmental factors.
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
Enables reliable and accurate detection of overload conditions at the hoist hook, even in harsh environments, with the ability to retain the trigger state for post-event examination, enhancing safety and reducing wear on the hoist system.
Implementation Method 1
Belleville springs, where the switch is triggered by load-induced deformation
Data Source
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AI summary
Hoist hook assembly having a cable overload detection system may include a plate (106), a hook (116) mechanically coupled to the plate, and a switch (114) mechanically coupled to the plate. The switch may be configured to translate into a triggered position in response to a load on the hook indicative of an overload condition.