Bending Boom Structure for Stress Distribution and Durability
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Solution Overview
Problem
Conventional booms in work machines experience stress concentration at the bending portion, leading to reduced durability.
Innovation Solution
A bending boom design featuring a middle portion with two extending portions, where the first side wall is flush with the middle portion and the second side wall is partially bent, with a longitudinal section area decreasing away from the middle portion, and including an arc-shaped bending section to distribute stress evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the bending portion is located in front of the oil cylinder base with a small distance between two ends of the boom, then the structure is compact, but stress concentration occurs at the bending portion affecting durability
Solution Approach 1:
The boom is divided into a middle portion and two extending portions, with the extending portions further segmented into first side walls (flush with middle portion) and second side walls (bent towards first side wall). This segmentation distributes stress away from the bending portion while maintaining compactness.
Solution Approach 2:
The second side wall is bent from the middle portion towards a direction near the first side wall, introducing a spatial dimension change. This bending action in a different direction redistributes stress concentrations and improves structural durability without compromising the compact boom design.
2Reliability
If the second side wall is bent from the middle portion towards the first side wall, then stress concentration is reduced, but the structure becomes more complex
Solution Approach 1:
The first side wall and second side wall are merged into a single extending portion structure, where the second side wall is bent from the middle portion towards the first side wall. This merging integrates the stress-distributing bending function into the existing side wall structure, reducing overall structural complexity while improving stress distribution.
Data Source
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AI summary
Disclosed are a bending boom, a boom device and a work machine. The bending boom includes a middle portion (100) and two extending portions (200). The middle portion (100) is configured to connect external components. The extending portion (200) has a first side wall (210) and a second side wall (220) opposite to the first wall (210). The first side wall (210) is flush with middle portion (100), and the second side wall (220) is bent from middle portion (100) towards a direction near first side wall (210). Two extending portions (200) are connected to two opposite ends of middle portion (100). By providing the matching middle portion (100) and extending portions (200), a situation in which stress concentration occurs at the middle portion (100) can be prevented, which improves stress condition of the bending boom, and improves durability of the bending boom, the boom device and the work machine.