Lifting Tool Stabilizing System for Eccentric Load Control
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Solution Overview
Problem
Existing lifting tools in cranes lack versatility and stability, particularly when dealing with loads that have an eccentric center of gravity or experience oscillations due to heave, wind, or resonance, leading to inefficient lifting operations.
Innovation Solution
The lifting tool incorporates a stabilizing system with a mass that is movably supported in a horizontal plane, allowing for static or dynamic stabilization, and a mass actuator assembly that can counteract oscillations by positioning the mass as a counterweight or compensating for dynamic movements, combined with a load positioning system for precise alignment and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional lifting tool is used without a stabilizing system, then the device complexity is low, but the stability of the lifting operation deteriorates when dealing with eccentric loads or oscillating conditions
Solution Approach 1:
The lifting tool incorporates a dynamically adjustable stabilizing system with a mass that can be repositioned in real-time during lifting operations. The mass is movably supported on the shank and can be displaced by actuator assemblies to dynamically counterbalance eccentric loads and compensate for oscillations, transforming a static lifting tool into an adaptive system that maintains stability under varying operational conditions.
Solution Approach 2:
The stabilizing system employs a dedicated mass that functions as a counterweight to offset the effects of eccentric centers of gravity and oscillating loads. By positioning this mass at appropriate locations on the shank and adjusting its position as needed, the system creates counterbalancing moments that stabilize the lifting operation, directly applying the counterweight principle to resolve the stability issue.
2Measurement precision
If a stabilizing system with movable mass is added to the lifting tool, then the stability and precision of lifting operations is improved, but the device complexity increases
Solution Approach 1:
The stabilizing system incorporates sensors that detect the position and orientation of the load, providing feedback to the control system. This feedback enables the control system to automatically adjust the mass position and load connector position via actuator assemblies, achieving precise alignment and stabilization without requiring complex manual intervention, thus managing the complexity through automated closed-loop control.
Solution Approach 2:
The stabilizing system is designed with multi-functional capabilities: the movable mass serves both as a counterweight for eccentric loads and as a dynamic compensator for oscillations; the load connector assembly provides both positioning and stabilization functions. This multi-functionality reduces the need for separate dedicated components, managing overall device complexity while achieving precise alignment and stabilization.
3Adaptability or versatility
If the mass is made movable in horizontal plane in two non-parallel directions, then the adaptability to different loading conditions is improved, but the device complexity increases
Solution Approach 1:
The mass is supported on the shank in a manner that enables movement in two non-parallel horizontal directions, creating a dynamically adaptable stabilizing system. This dual-directional mobility allows the mass to position itself optimally for various loading configurations and oscillation patterns, significantly enhancing adaptability to different operational conditions while the modular actuator assemblies manage the mechanical complexity.
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
This solution enhances the stability and precision of lifting operations by aligning the center of gravity with the suspension cables, reducing oscillations and improving the overall stability of the hoisting system, even in challenging conditions such as wave action or wind.
Implementation Method 1
the mass of the lifting tool is positioned such that it forms a counterweight for situations with an eccentric centre of gravity
Implementation Method 2
controlled motion of the mass of the lifting tool compensates for dynamic movements of the crane or the load. E.g. it compensates for oscillating loads
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
The invention relates to a (spreader) lifting tool, a hoisting system comprising such a lifting tool and a hoisting method wherein use is made of such a lifting tool. The (spreader) lifting tool is configured to be suspended from a hoisting crane via one or more cables. The tool is provided with a stabilizing system comprising a movably supported mass and a mass actuator assembly that is configured for displacement of the mass in a horizontal plane in two non-parallel directions, e.g. an X-direction and an Y-direction.