Bending Boom Structure to Reduce Stress Concentration
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Solution Overview
Problem
Conventional booms in work machines experience stress concentration at the bending portion, leading to poor 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, and including an arc-shaped bending section to stagger the structure and reduce stress concentration.
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 ends, then the boom structure is compact, but stress concentration occurs at the bending portion affecting durability
Solution Approach 1:
The boom is divided into multiple sections (first section, second section, third section) with distinct functional zones. The bending portion is segmented from the oil cylinder base connection, creating separate structural elements that reduce stress concentration while maintaining compact overall dimensions.
Solution Approach 2:
The bending portion is designed with localized quality changes including increased wall thickness, reinforced加强 plates, and optimized curvature radius at specific locations to distribute stress evenly. This local reinforcement prevents stress concentration while keeping the rest of the boom structure compact.
2Length of moving object
If the distance between two ends of the boom is small, then the boom is compact for transport, but stress concentration occurs at the bending portion
Solution Approach 1:
The bending portion employs optimized curvature with a larger radius of curvature to reduce stress concentration. The curved transition zones smoothly connect different boom sections, distributing stress more evenly compared to sharp angles or small radius bends, while maintaining compact boom length.
Solution Approach 2:
The boom incorporates composite construction with different material properties in different sections. High-strength materials are used in the bending portion and connection areas, while lighter materials are used in non-critical sections, optimizing the stress distribution and overall compactness.
Data Source
AI summary
Disclosed are a bending boom, a boom device and a work machine. The bending boom includes a middle portion and two extending portions. The middle portion is configured to connect external components. The extending portion has a first side wall and a second side wall opposite to the first side wall. The first side wall is flush with middle portion, and the second side wall is bent from middle portion towards a direction near first side wall. The two extending portions are connected to two opposite ends of middle portion. By providing the matching middle portion and extending portions, a situation in which stress concentration occurs at the middle portion 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.