Telescopic Boom Gap Maintenance via Integrated Boss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing telescopic boom structures in mobile cranes face challenges in maintaining a predetermined gap between booms due to welding strain, which affects the assembly and design requirements, leading to manufacturing issues.
Innovation Solution
A telescopic boom design that incorporates a boom fixing mechanism with a gap maintaining member provided to the fixing boss, allowing the boom fixing pin to advance and retreat, and maintaining the gap between booms without direct welding to the boom, thereby reducing welding strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the fixing boss and slide plate are welded directly to the boom, then the strength and mounting method are improved, but welding strain occurs in the thin steel plate boom
Solution Approach 1:
The patent introduces an intermediary structure (fixing boss with integrated gap maintaining member) that mediates between the welding requirement for strength and the gap maintenance requirement for precision. The gap maintaining member protrudes from the fixing boss to maintain the gap without being welded directly to the boom, thus protecting the gap dimension from welding strain while the fixing boss provides the necessary welding attachment point for strength.
2Weight of moving object
If the boom thickness is reduced and gap between booms is minimized for compact design, then the telescopic boom becomes lightweight and compact, but welding strain occurs more easily during manufacturing
Solution Approach 1:
The patent segments the fixing boss into functional portions: a main body that is welded to the boom for strength, and a protruding gap maintaining member that maintains the gap without welding. This segmentation allows the thin-walled boom to be manufactured with minimal welding strain while still achieving the required gap maintenance and structural strength.
3Reliability
If multiple separate components (fixing boss and slide plate) are welded to the boom, then the gap can be maintained, but the space for gap between booms increases and manufacturing complexity increases
Solution Approach 1:
The patent merges the fixing boss and slide plate functions into a single integrated component. The fixing boss includes an integrated gap maintaining member that performs both the fixing function and the gap maintenance function, eliminating the need for separate slide plate components and reducing the number of welding operations required.
Data Source
AI summary
A lightweight and high-rigidity telescopic boom in which strain during manufacturing is suppressed is disclosed. In a telescopic boom, a plurality of booms forms a telescope structure, and the telescopic boom includes a boom fixing mechanism that fixes a top boom disposed relatively inside at a predetermined position with respect to a first intermediate boom disposed relatively outside. The boom fixing mechanism includes a boom fixing pin that is provided to the top boom and advances and retreats with respect to the first intermediate boom, a fixing boss that is provided to the first intermediate boom and into which the boom fixing pin is inserted and extracted, and a gap maintaining member that is provided to the fixing boss and protrudes outward to maintain a gap between the first intermediate boom and a second intermediate boom disposed further outside.