Crane Boom Derricking Angle Control for Load Swing Suppression
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Solution Overview
Problem
Existing swing suppression methods in cranes, which rely solely on unwinding the wire rope, are inefficient in guaranteeing the necessary speed to stop the swing of a suspended load during turning.
Innovation Solution
A crane design that incorporates a rotating platform and a boom capable of automatic derricking, where the derricking angle of the boom is adjusted to suppress swing by increasing and decreasing the angle, without unwinding the wire rope, using control units to manage the operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If wire rope unwinding is used for swing suppression, then swing can be stopped, but the speed to stop swing cannot be guaranteed and the process is inefficient
Solution Approach 1:
The boom's derricking angle is dynamically adjusted during the swing suppression process. The control unit automatically increases and decreases the derricking angle in response to swing detection, creating a dynamic control mechanism that responds rapidly to swing conditions without the delays inherent in wire rope unwinding methods.
Solution Approach 2:
The system changes the derricking angle parameter to suppress swing. By varying the boom angle rather than relying on wire rope length changes, the system achieves faster response times and more effective swing control, as the derricking mechanism can adjust angles much more rapidly than wire rope can be unwound.
2Reliability
If wire rope unwinding is used for swing suppression, then swing can be controlled, but the process is slow and time-consuming
Solution Approach 1:
The dynamic adjustment of the derricking angle allows the system to respond immediately to swing conditions. The control unit continuously monitors swing and automatically adjusts the boom angle in real-time, eliminating the time delays associated with wire rope unwinding while maintaining reliable swing control throughout the process.
Solution Approach 2:
The patent replaces the wire rope unwinding mechanical system with a boom derricking mechanism for swing suppression. This substitution enables faster response times because the derricking system can change boom angles much more quickly than wire rope can be unwound, while still achieving the same swing control objective.
3Speed
If automatic derricking angle adjustment is used, then swing suppression speed is improved, but device complexity increases
Solution Approach 1:
The control unit implements a feedback mechanism that detects swing conditions and automatically adjusts the derricking angle in response. This closed-loop control system achieves fast swing suppression by continuously monitoring and responding to swing, while the automation of the control process actually reduces operational complexity compared to manual wire rope unwinding methods.
Solution Approach 2:
The system performs swing suppression automatically through the control unit that self-regulates the derricking angle based on detected swing conditions. This self-service capability eliminates the need for manual intervention and reduces operational complexity, as the system manages its own swing control without requiring additional mechanical components or complex manual 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
This method effectively suppresses the swing of the suspended load by adjusting the boom's derricking angle, ensuring rapid and efficient control of swing without the need for wire rope unwinding, allowing precise movement and prediction of the load's trajectory.
Implementation Method 1
the crane automatically increases and decreases a derricking angle of the boom to suppress a swing of a suspended load when the rotating platform turns to move the suspended load
Data Source
AI summary
A crane includes a rotating platform, and a boom capable of being derricked with respect to the rotating platform, in which the crane automatically increases and decreases a derricking angle of the boom to suppress a swing of a suspended load when the rotating platform turns to move the suspended load.