Crane Ballast Adjusting Boom Radius Control
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Solution Overview
Problem
Conventional cranes face limitations in adjusting the suspended ballast radius, leading to either a small counter-torque with a steep derrick boom or a reduced lever arm with a flatter boom, making it difficult to maintain optimal boom extension and counter-torque simultaneously.
Innovation Solution
A rearwardly directed ballast adjusting boom is luffably mounted on the crane, allowing for stepless adjustment of the suspended ballast radius by changing the luffing angle, eliminating the need for complex and expensive telescoping or folding mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the derrick boom is positioned steeply to improve lever geometry for erecting the main boom, then the lever arm is optimized, but the suspended ballast radius becomes small and counter-torque is reduced
Solution Approach 1:
The counter-boom system is divided into two separate booms: the derrick boom (for bracing the main boom) and the ballast adjusting boom (for controlling ballast radius). This segmentation allows each boom to independently optimize its function without compromising the other.
Solution Approach 2:
The ballast adjusting boom adds a new dimensional degree of freedom to the system. By independently controlling the luffing angle of the ballast adjusting boom, the ballast radius can be adjusted in a separate dimension from the derrick boom angle, enabling simultaneous optimization of both lever arm and counter-torque.
2Force
If the derrick boom is positioned flatter to increase suspended ballast radius and counter-torque, then counter-torque is improved, but the lever arm to the main boom is reduced
Solution Approach 1:
The counter-boom system is divided into two separate booms: the derrick boom (for bracing the main boom) and the ballast adjusting boom (for controlling ballast radius). This segmentation allows each boom to independently optimize its function without compromising the other.
Solution Approach 2:
The ballast adjusting boom adds a new dimensional degree of freedom to the system. By independently controlling the luffing angle of the ballast adjusting boom, the ballast radius can be adjusted in a separate dimension from the derrick boom angle, enabling simultaneous optimization of both lever arm and counter-torque.
3Length of moving object
If a rigid guide is used to constantly urge the suspended ballast to the outside for increasing radius, then ballast radius is increased, but the ballast cannot be kept in the air when main boom is steeply positioned and must be put down on the ground
Solution Approach 1:
The ballast adjusting boom is designed with dynamic adjustability through its luffing mechanism. The luffing angle can be continuously changed to adapt to different operational requirements, allowing the ballast radius to be dynamically controlled rather than fixed by a rigid guide.
Solution Approach 2:
The system changes the parameter of ballast radius by adjusting the luffing angle of the ballast adjusting boom. This parameter change allows continuous variation of ballast radius from small to large, enabling the ballast to be kept in the air across different boom positions and crane operations.
4Adaptability or versatility
If a variable-length guide with telescoping or folding mechanism is used to determine ballast radius, then ballast radius adjustment is achieved, but the construction becomes complex and expensive
Solution Approach 1:
The ballast adjusting boom is designed with dynamic adjustability through its luffing mechanism. The luffing angle can be continuously changed to adapt to different operational requirements, allowing the ballast radius to be dynamically controlled rather than fixed by a rigid guide.
Solution Approach 2:
The system changes the parameter of ballast radius by adjusting the luffing angle of the ballast adjusting boom. This parameter change allows continuous variation of ballast radius from small to large, enabling the ballast to be kept in the air across different boom positions and crane operations.
Data Source
AI summary
The present invention relates to a crane comprising a main boom and a rearwardly directed derrick boom for bracing the main boom, wherein a suspended ballast is directly or indirectly attached to the derrick head via connecting means, wherein at least one luffable, rearwardly aligned ballast adjusting boom is provided, which acts on the connecting means and influences the suspended ballast radius by its luffing angle.