Crane Damping Arrangement for Load Oscillation Control
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Solution Overview
Problem
Existing solutions for damping oscillations in crane loading members, particularly when handling heavy loads at high speeds, are either expensive, require significant space, or lead to post-oscillations and increased risk of collision due to rigid support methods, which are not suitable for high-speed operations with sensitive loads like paper rolls.
Innovation Solution
A modular damping arrangement featuring a separate support frame with a floating guide tube structure and side damping modules connected between the guide tube and the support frame, allowing for adjustable positioning and easy installation between hoisting ropes, minimizing space usage and enabling high-speed lifting while reducing stress on the trolley and ensuring safer load handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If rigid support methods (brackets) are used to prevent oscillation, then oscillation is suppressed, but post-oscillations occur and collision risk increases due to rigid support during high-speed lifting
Solution Approach 1:
The patent changes the rigidity parameter of the support structure by using elastic elements (springs, rubber, or viscous dampers) instead of rigid brackets. This allows the support to adapt its stiffness based on operational conditions, providing oscillation suppression during low-speed operation while allowing controlled movement during high-speed lifting to prevent post-oscillations and collision.
Solution Approach 2:
The patent transitions from a static rigid support system to a dynamic support system that can adapt its characteristics during operation. The elastic elements allow the support structure to dynamically respond to loading conditions, providing rigidity when needed for oscillation suppression and flexibility when needed during high-speed operations to prevent post-oscillations.
2Stability of the object's composition
If downward-pointing brackets are used to retain load rigidly, then oscillation is prevented, but the system becomes expensive and requires significant material and space
Solution Approach 1:
The patent extracts the essential damping function from the complex bracket structure and implements it through simpler elastic elements. Instead of using heavy rigid brackets that require significant material and space, the invention uses compact elastic elements (springs, rubber, or viscous dampers) that provide the same oscillation suppression function with minimal material consumption and reduced spatial requirements.
Solution Approach 2:
The patent changes the structural parameters by replacing rigid bracket configurations with elastic element-based systems. This parameter change allows the same oscillation suppression function to be achieved with reduced material usage and simplified structure, as the elastic elements can be configured in various forms (torsion springs, compression springs, rubber pads, viscous dampers) that optimize the balance between performance and material efficiency.
3Productivity
If the loading member is lifted at high speed between brackets, then productivity increases, but the gap between brackets must be wide which leads to post-oscillations
Solution Approach 1:
The patent changes the support characteristic parameter from rigid to elastic, allowing the system to accommodate high-speed lifting without requiring wide gaps between support elements. The elastic elements can compress and deform during high-speed operation, maintaining contact and stability even when the loading member moves quickly, thereby preventing post-oscillations while enabling high productivity.
Solution Approach 2:
The patent introduces dynamic adaptability to the support system through elastic elements that can respond in real-time to the motion of the loading member during high-speed lifting. This dynamic response allows the support structure to maintain appropriate contact forces and positioning even during rapid movements, preventing post-oscillations while enabling high-speed operation for improved productivity.
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 modular damping arrangement effectively reduces oscillations and stress on the trolley, ensuring safer and more reliable transport of loads at high speeds without the need for extensive space or additional service planes, while maintaining flexibility for service and adjustment.
Implementation Method 1
The guide tube structure (11; 110) is suspended from an upper part of the support frame (12) by means of an elastic element (34; 134, 234, 235)
Implementation Method 2
side damping modules (14) connected between a side wall of the guide tube structure (11; 110) and the support frame (12), around the guide tube structure (11; 110) for substantially damping horizontal movement of the guide tube structure (11; 110)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to an arrangement for damping oscillation of a loading member in a crane comprising a trolley (2), a hoisting mechanism, hoisting ropes (4), a loading member (5) fastened to the hoisting ropes, the arrange- ment comprising a vertical guide projection (10) arranged in an upper part of the loading member, and a guide part (11) arranged in the trolley and receiving the guide projection, damping members (14, 15) connected to the guide part being arranged in a separate support frame (12) which,in a hoisting direction of the loading member,is guidable into its place in a dock (13) arranged un- derneath the trolley and which is lowerable off the dock, onto the loading member, the guide part being a floating guide tube structure (11),and the damping members comprising a plurality of side damping modules (14) con- nected between a side wall of the guide tube structure and the support frame, around the guide tube structure,for substantially damping horizontal move- ment of the guide tube structure, and a support joint (15) which is arranged in an upper part of the support frame and from which the guide tube structure is suspended.