Telescopic Crane Boom Profile for Higher Buckling Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing telescopic crane boom profiles face challenges in achieving high rigidity and buckling resistance across both vertical and horizontal axes, with previous designs often compromising on space efficiency and material distribution, leading to instability under various loads and increased risk of buckling.
Innovation Solution
The design incorporates upper and lower profile parts with curved cross-sectional sections, featuring a combination of more outwardly curved and less outwardly curved segments with obliquely inclined end segments, which optimizes space usage and enhances rigidity, torsion resistance, and load-bearing capacity by distributing material further from the centroid and limiting buckling fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the upper cross-sectional part is designed with flat sheets and rounded corners, then manufacturing is simplified, but buckling resistance is significantly reduced
Solution Approach 1:
The patent applies curvature to the upper cross-sectional part by introducing outwardly curved shell segments instead of flat sheets. The curvature radius is specifically designed to be at least half the inner width of the cross-section, creating a rounded profile that inherently resists buckling while maintaining manufacturing feasibility through controlled curvature rather than complex shaping.
Solution Approach 2:
The patent changes the geometric parameters of the upper cross-sectional part by defining specific curvature radii (at least half the inner width) and segment configurations. This parameter optimization balances buckling resistance with manufacturing simplicity, transforming the upper part from a vulnerable flat structure to a resilient curved structure without excessive complexity.
2Reliability
If the lower cross-sectional part is designed with outwardly curved shell segments, then flexural rigidity and buckling resistance are improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the lower cross-sectional part into multiple outwardly curved shell segments rather than attempting to form the entire structure as a single complex piece. This segmentation allows each segment to be manufactured and assembled separately, reducing individual manufacturing complexity while achieving the overall buckling resistance through the cumulative effect of multiple curved elements.
3Strength
If material is distributed further from the centroid to increase rigidity, then area moments of inertia increase, but space available for telescopic nesting is reduced
Solution Approach 1:
The patent applies different curvature characteristics to different parts of the cross-section. The upper part has curvature radius of at least half the inner width, while the lower part has outwardly curved segments with potentially different radii. This local differentiation optimizes rigidity where needed while controlling overall dimensions for nesting compatibility.
Solution Approach 2:
The patent creates an asymmetric cross-sectional design where the upper and lower parts have different curvature characteristics and segment configurations. This asymmetry allows optimization of the upper part for buckling resistance with gentler curvature while the lower part can have more aggressive curvature for rigidity, achieving balance between strength and nesting space through non-uniform material distribution.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a telescopic crane boom section (1) with an upper profile section (10) and a lower profile section (20) having curved cross-sectional sections (12 to 19; 22 to 28), wherein the upper profile section (10) and the lower profile section (20) each have, on one side of the cross-section symmetrical to the vertical central plane (3), a less strongly outwardly curved segment (14, 24) and a more strongly outwardly curved segment (16, 26) starting from the connection point (2) of the profile sections (10, 20), and wherein the end segments (12, 22; 14, 24) adjoining each other at the connection point (2) extend obliquely outwards.