Mobile Lift Crane Segmentation Dynamics
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Solution Overview
Problem
Existing mobile lift cranes face limitations in lifting very heavy loads while maintaining mobility, as they often struggle to balance the weight and facilitate movement over uneven ground surfaces.
Innovation Solution
A mobile lift crane design comprising a central crane unit, a boom unit, and a counterweight unit connected by structural members that allow for relative vertical movement and lateral alignment, with moveable ground engaging members and rigging for counterbalancing loads, enabling the crane to lift heavy loads and maintain mobility by distributing weight effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the crane uses traditional fixed counterweight and boom units, then the structure is simple, but the lift capacity is limited and mobility is reduced
Solution Approach 1:
The crane is divided into separate functional modules: a central crane unit, a boom unit with moveable ground engaging members, and a counterweight unit. Each unit can move independently, allowing the boom and counterweight to be positioned optimally for different lift scenarios, thereby increasing lift capacity without permanently increasing overall structure complexity
Solution Approach 2:
The boom unit and counterweight unit are designed with moveable ground engaging members that can adjust their positions dynamically. The boom can be extended or retracted, and the counterweight can be repositioned, allowing the crane to adapt to different load requirements and maintain high lift capacity across various operating conditions
2Strength
If the crane increases its counterweight to lift heavier loads, then the lift capacity increases, but the mobility and ability to travel over ground decreases
Solution Approach 1:
The counterweight unit is designed with moveable ground engaging members that can be repositioned during operation. This allows the counterweight to be dynamically adjusted closer to or farther from the load, optimizing the balance between lift capacity and mobility for different operating conditions
Solution Approach 2:
By separating the counterweight into an independent unit that can move relative to the central crane unit, the system allows the counterweight to be positioned optimally for each specific lift, enabling heavy lifts while maintaining the ability to travel over ground when needed
3Stability of the object's composition
If the boom unit and counterweight unit are rigidly connected, then lateral alignment is maintained, but vertical movement and adaptability are restricted
Solution Approach 1:
The connection between the boom unit and counterweight unit is divided into lateral and vertical components: structural members maintain rigid lateral alignment to prevent unwanted movement, while separate moveable connections allow independent vertical movement of each unit, providing both stability and adaptability
Solution Approach 2:
Different parts of the connection system have different degrees of freedom: the lateral connection uses rigid structural members to maintain alignment, while the vertical connection uses moveable ground engaging members to allow adjustment, optimizing both alignment stability and operational flexibility
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 crane achieves high lift capacities, up to 2,000 metric tons with short boom and radii, while remaining mobile, by effectively counterbalancing loads and allowing for travel in various directions, enhancing its operational flexibility and capacity.
Implementation Method 1
rigging connecting the boom and counterweight unit such that a load lifted by the boom can be counterbalanced by the counterweight
Implementation Method 2
structural members that car-y compressive loads and maintain the boom unit, the rotating bed and the counterweight unit in lateral alignment with each other
Data Source
AI summary
A mobile lift crane includes a central crane unit, a boom unit and a counterweight unit. The central crane unit has a carbody, moveable ground engaging members and a rotating bed mounted to the ground engaging members with a rotatable connection such that the rotating bed can swing with respect to the ground engaging members. The boom unit has a support member, at least one moveable ground engaging member, and a boom pivotally mounted on the support member. The counterweight unit has counterweight on a support member. Rigging connects the boom and counterweight unit such that a load lifted by the boom can be counterbalanced by the counterweight. The boom unit and counterweight unit are connected to the central crane unit by structural members that carry compressive loads and maintain the boom unit, the rotating bed and the counterweight unit in lateral alignment with each other, but allow relative vertical movement between the boom unit, the rotating bed and the counterweight unit. A main mast is pivotally mounted on the combination of the central crane unit, the boom unit and the structural member between the central crane unit and the boom unit. In another embodiment, a counterweight unit with a swing axis and boom unit are connected directly together with a structural member. Ground engaging members on the boom unit can be rotated relative to a boom unit support member such that the boom unit i) can travel in an arc around the swing axis of the counterweight unit and ii) travel in direction in line with the structural member.