Hoist Rope Slack Detection Using Load Hook Inclination
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Solution Overview
Problem
Existing lifting gear systems face issues with slack rope formation due to manual detection methods being unreliable, especially in complex environments with changing contours, leading to potential damage to hoist ropes and pulleys, and improper winding, which existing environmental mapping is time-consuming and impractical.
Innovation Solution
A system using an inclination sensor system and load sensor system to monitor the tilt and load of the load-receiving means, providing a slack-rope signal when predetermined tilt and load thresholds are exceeded, with a control device to automatically adjust operations to prevent further slack rope formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the load hook is lowered deeper to increase lifting capacity, then the lifting range is improved, but slack rope formation occurs causing damage and operational problems
Solution Approach 1:
The system performs preliminary detection of slack rope conditions using inclination sensors and load sensors before actual damage occurs. The control device receives sensor signals and determines slack rope formation in advance, allowing preventive action to be taken before the lower block touches the ground or the rope becomes damaged.
Solution Approach 2:
The system implements continuous feedback through inclination sensors monitoring the tilt of the load-receiving means and load sensors monitoring rope tension. This feedback is transmitted to the control device which adjusts the lowering operation in real-time, preventing slack rope formation while maximizing lifting range.
2Ease of operation
If manual monitoring is used to prevent slack rope, then operational simplicity is maintained, but operator errors and fatigue lead to undetected slack rope formation
Solution Approach 1:
The system enables self-service operation where the lifting gear automatically monitors its own state through integrated inclination sensors and load sensors. The control device autonomously determines slack rope conditions and can automatically adjust operations, eliminating the need for continuous manual monitoring while improving detection reliability.
Solution Approach 2:
The patent replaces manual visual monitoring with automated sensor-based detection systems. Inclination sensors and load sensors substitute for human operators, providing continuous, fatigue-free monitoring that reliably detects slack rope conditions without operator error.
3Reliability
If maximum lowering depth is scaled for each construction site to prevent ground contact, then slack rope prevention is improved, but the system becomes complex and cannot adapt to changing site conditions
Solution Approach 1:
The system transitions from static pre-scaled lowering depth limits to dynamic real-time monitoring. The inclination sensors and load sensors continuously adapt to changing site conditions, allowing the system to automatically adjust to varying ground levels, pit depths, and construction progress without requiring manual re-scaling.
Solution Approach 2:
The patent changes the approach from fixed parameter (pre-determined lowering depth) to variable parameters (real-time inclination and load measurements). This allows the system to adapt to changing construction site conditions dynamically, eliminating the need for complex pre-scaling procedures.
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 system reliably detects slack rope without requiring continuous environmental mapping, preventing damage by automatically adjusting operations to maintain proper rope tension, thus enhancing safety and reducing wear on lifting gear components.
Implementation Method 1
an inclination sensor system for detecting an inclination and/or a tilt rate and/or a tilt acceleration of the load-receiving means
Implementation Method 2
a load sensor system for detecting a load acting on the hoist rope and/or a rope force present in the hoist rope
Data Source
AI summary
The present invention relates to lifting gear comprising a hoist rope, on which a load-receiving means is provided for receiving and lifting a load, and a determining device for determining slack rope on the hoist rope, wherein the aforementioned determining device comprises an inclination sensor system for detecting an inclination and/or a tilt rate and/or a tilt acceleration of the load-receiving means and provides a slack-rope signal if the detected inclination and/or tilt rate and/or tilt acceleration of the load-receiving means exceeds a predetermined limit value.