Foldable Lattice Piece for Mobile Crane Boom Transport
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Solution Overview
Problem
Large mobile cranes face limitations in load capacity and outreach due to transportation regulations, as existing solutions result in booms with greater width than height, leading to reduced load capacity in the luffing plane and limited maximum length during erection.
Innovation Solution
A lattice piece design for mobile cranes comprising four corner posts and diagonal bars, where one part of the diagonal bars is foldably hinged at two corner posts, allowing for disassembly into two parts for transport, enabling the creation of larger booms with a cross-section of 8×6 m and 11 m length, with optional null bars for increased stability and telescopable components for assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the boom width is increased to achieve larger load capacity, then the load capacity increases, but the width becomes greater than the height which reduces load capacity in the luffing plane
Solution Approach 1:
The lattice boom is divided into multiple modular lattice pieces that can be assembled together. Each lattice piece has a standardized cross-section that maintains optimal structural properties, while the overall boom length can be extended by assembling multiple segments, thus achieving large load capacity without compromising the height-width ratio.
Solution Approach 2:
Instead of increasing the width of the boom cross-section to achieve larger load capacity, the invention extends the boom in the length dimension by assembling multiple lattice pieces. This maintains the optimal height-width ratio for load capacity while achieving the required outreach through increased length.
2Strength
If the lattice piece size is increased to achieve larger boom capacity, then the load capacity increases, but the transportability under road regulations is compromised
Solution Approach 1:
The large lattice boom is segmented into smaller standardized lattice pieces with dimensions suitable for road transport. These modular segments can be transported separately and assembled on-site to form the required large boom structure, thus achieving both transportability and large boom capacity.
Solution Approach 2:
The lattice pieces are designed with nested or stacked configurations that optimize their transport dimensions. The modular design allows segments to be positioned within standardized transport containers, maximizing space utilization while maintaining road transport compliance.
3Length of moving object
If the lattice pieces are made disassemblable for transport, then the transportability improves, but the assembly complexity and time increase
Solution Approach 1:
The lattice boom is divided into standardized modular segments with uniform connection interfaces. This segmentation enables disassembly for transport while the standardization of connection elements minimizes assembly complexity, allowing rapid reconfiguration using common components and procedures.
Solution Approach 2:
The lattice pieces are designed with universal connection elements and standardized interfaces that can be used across different configurations. This multi-functionality reduces assembly complexity by eliminating the need for specialized components for each configuration, enabling consistent assembly procedures regardless of the final boom size.
Data Source
AI summary
This invention relates to a lattice piece for a large mobile crane, comprising four corner posts and null bars and diagonal bars connecting the same. In accordance with the invention, the lattice piece each is divided in two such that one part of the null and diagonal bars each is foldably hinged at two corner posts connected with each other. Furthermore, the invention relates to a method for erecting such lattice piece.