Crane Jib Profile Shape for Force Distribution
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Solution Overview
Problem
Existing crane arms, particularly when installed in boom systems, experience unfavorable force introduction and complex manufacturing processes, often requiring thicker metal sheets and complex construction.
Innovation Solution
A crane arm design featuring an imaginary contour line with a narrowing shape, allowing for thinner metal sheets and simpler manufacturing, with an arcuate section approximated by polygons or circular arcs, enabling better force distribution and weldability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional crane arm designs are used, then structural strength is maintained, but manufacturing complexity increases and force distribution becomes unfavorable
Solution Approach 1:
The contour line is divided into multiple straight sections (first, second, third, fourth sections) that can be independently defined by coordinate points, allowing simplified manufacturing through sequential fabrication and assembly of distinct geometric segments rather than complex curved surfaces
Solution Approach 2:
The design changes the geometric parameters of the contour line by defining it through discrete coordinate points and straight sections, transforming the shape into a form that is easier to manufacture while maintaining the necessary structural properties for force distribution
2Strength
If thicker metal sheets are used, then structural strength and stability are improved, but weight increases and manufacturing becomes more difficult
Solution Approach 1:
The contour line design creates varying local thicknesses and cross-sectional areas at different positions along the crane arm, optimizing material distribution to provide necessary strength where required while reducing weight in less critical areas, rather than using uniformly thick metal sheets throughout
Solution Approach 2:
The design effectively creates a composite structural form by combining multiple straight sections with different orientations and thicknesses, achieving superior structural efficiency compared to simple homogeneous thick sheets
3Strength
If complex contour shapes are used, then structural performance is optimized, but manufacturing precision requirements increase
Solution Approach 1:
The complex contour is segmented into multiple straight sections defined by discrete coordinate points, which can be manufactured and assembled with standard precision tolerances rather than requiring high-precision fabrication of complex curved surfaces as a single continuous shape
Data Source
Figure 1a~1d
Figure 1e~1f
Figure 1g~2
AI summary
The invention relates to a crane jib for a crane, having a longitudinal axis and an imaginary contour line that extends in a transversal plane relative to an axis of symmetry (s) in an at least approximately mirror-symmetric manner and that is straight in at least some sections thereof, the contour line intersecting the axis of symmetry (s) in a first and a second point of intersection (S1, S2) and tapering in the direction of the second point of intersection (S2) at least before the last third of the distance (D) between the first and the second point of intersection (S1, S2), the tapered section of the contour line extending up to the second point of intersection (S2) and ending in a rounded-off section (1) on the bisecting line (s).