Luffing Crane Boom Cross-Section Change Adapter
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Solution Overview
Problem
Vehicle cranes with luffable main jibs and additional jib systems face challenges in reducing weight and achieving economical production while maintaining load-bearing capabilities, particularly due to the design of jib sections and the use of additional components for extension.
Innovation Solution
The vehicle crane incorporates a first additional jib part with a rectangular cross-section and a second additional jib part with a triangular cross-section, coupled via a cross-section change adapter, reducing the number of longitudinal chords and transverse struts, allowing for a lighter design with equivalent strength and enabling more economical production by using less material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a traditional additional jib system with rectangular cross-section is used, then the load-bearing capability is sufficient, but the dead weight is high and material consumption is large
Solution Approach 1:
The patent applies different cross-sectional designs to different parts of the additional jib system. The first additional jib part has a rectangular cross-section with four longitudinal chords, while the second additional jib part has a triangular cross-section with three longitudinal chords. This local differentiation allows weight reduction in the second part where lower loads occur, while maintaining sufficient load-bearing capability in the first part that connects to the main jib.
Solution Approach 2:
The patent changes the structural parameters of the additional jib system by transitioning from a uniform rectangular cross-section to a variable cross-section design. The cross-section changes from rectangular (four chords) in the first additional jib part to triangular (three chords) in the second additional jib part. This parameter change reduces material consumption and dead weight while adapting the load-bearing capability to the actual load distribution along the jib length.
2Length of moving object
If the jib length is increased to extend working region, then the working region coverage is improved, but the loads on jib parts increase and require heavier construction
Solution Approach 1:
The patent divides the additional jib system into two separate parts: a first additional jib part with rectangular cross-section and a second additional jib part with triangular cross-section. These parts are coupled together via a cross-section change adapter. This segmentation allows each part to be optimized independently for its specific load conditions, enabling longer overall jib length without proportionally increasing the weight of the entire system.
Solution Approach 2:
The patent introduces a dimensional change in the cross-sectional geometry of the additional jib system. By transitioning from a four-chord rectangular cross-section to a three-chord triangular cross-section in the second additional jib part, the structure achieves weight reduction while maintaining load-bearing capability through the optimized geometric configuration.
3Ease of manufacture
If a uniform cross-section design is used for additional jib parts, then the manufacturing is simpler, but the material consumption is higher and weight is increased
Solution Approach 1:
The patent implements local quality differentiation by using a rectangular cross-section with four longitudinal chords for the first additional jib part and a triangular cross-section with three longitudinal chords for the second additional jib part. This localized structural optimization reduces material consumption in the second part where lower loads occur, while maintaining manufacturing feasibility through standardized connection components.
Data Source
AI summary
A vehicle crane having a luffable main jib and an additional jib system arranged on a free end section of the main jib and comprising a first additional jib part and a second additional jib part. To further reduce the weight of the additional jib system and the vehicle crane fitted therewith, and to permit an overall more economical mode of production, the first additional jib part has a rectangular cross-section having four longitudinal chords connected together via transverse struts or/and diagonal struts and the second additional jib part has a triangular cross-section having three longitudinal chords connected together via transverse struts, wherein the two additional jib parts are coupled, or can be coupled, together via a cross-section change adapter.