Crane Guying Frame Spatial Lattice Boom Stability
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Solution Overview
Problem
Conventional crane boom guying systems are inadequate in managing lateral deformations and bending moments, especially with increasing boom lengths, as they primarily transmit tensile forces, failing to effectively counteract compressive and transverse forces that lead to significant boom deflections and deformations during crane operation.
Innovation Solution
The introduction of a guying frame that can transmit compressive and transverse forces, designed with a spatial lattice construction and adjustable length, positioned between the derrick boom and the boom tip, which counteracts bending moments and reduces lateral deformations by maintaining the guying over the rear side of the boom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional guying systems are used, then the structure is simple, but lateral deformations and bending moments increase significantly
Solution Approach 1:
The guying frame transitions the guying system from a one-dimensional rope configuration to a three-dimensional spatial structure. The frame provides multiple connection points and structural elements that operate in three dimensions, enabling simultaneous resistance to lateral deformations, bending moments, and vertical loads, thereby resolving the contradiction between structural simplicity and stability.
Solution Approach 2:
The guying frame combines multiple materials and structural components (steel profile, lattice construction, connection elements) into a composite system. This composite structure integrates the strengths of different materials and configurations to simultaneously address lateral deformation and bending moment resistance, achieving enhanced stability without excessive complexity.
2Manufacturing precision
If additional guying support is added, then boom deflection is limited, but bending moments are increased due to transverse forces
Solution Approach 1:
The guying frame's three-dimensional spatial configuration allows it to counteract bending moments through its structural geometry and multiple connection points. The frame distributes forces across multiple dimensions rather than concentrating them at a single point, enabling deflection control while reducing the magnitude of bending moments compared to conventional linear guying arrangements.
Solution Approach 2:
The guying frame acts as an intermediary structure between the guying rope and the boom. It distributes and transforms the forces transmitted by the guying, converting concentrated tensile forces into distributed compressive and transverse forces that counteract bending moments more effectively, thereby controlling deflection without excessively increasing bending moments.
3Ease of manufacture
If guying runs over the boom back, then installation is simple, but transverse forces increase lateral deformation
Solution Approach 1:
The guying frame elevates the guying system from a two-dimensional plane (boom back surface) to a three-dimensional spatial structure positioned above the boom. This dimensional change allows the guying to run over the frame rather than directly over the boom back, creating a more favorable force transmission path that reduces transverse forces on the boom while maintaining installation simplicity.
Solution Approach 2:
The guying frame serves as an intermediary structure that the guying rope runs over, positioned above the boom rather than directly on the boom back. This intermediary arrangement modifies the force transmission path, redirecting transverse forces through the frame structure and reducing the lateral deformation imposed on the boom, while the frame's design maintains ease of installation.
Data Source
AI summary
The invention relates to a crane, in particular to a mobile crane, comprising a lattice boom, a derrick boom, and a boom guying led from the derrick boom to the boom tip, wherein at least one guying frame is provided that is fastened to the boom between the derrick boom and the boom tip and is connected to the boom guying.