Telescopic Boom Luffing Cylinder Mount Force Distribution
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Solution Overview
Problem
The existing sheet metal structure for luffing cylinder mounts in telescopic booms leads to inefficient force distribution, resulting in high weight, buckling risks, and manufacturing challenges due to thick sheet metal and additional stiffening requirements.
Innovation Solution
A new design featuring spatially separate, narrow, and obliquely oriented closed sheet metal box structures that converge at the luffing cylinder mount, directing forces into stiffer sections of the boom, reducing sheet metal thickness and eliminating the need for excessive stiffening, with optional U buckling braces and wing metal sheets for deformation prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a wide and closed sheet metal structure is used for the luffing cylinder mount, then the force distribution is improved, but the weight of the total structure increases due to high sheet metal thickness
Solution Approach 1:
The invention divides the single wide sheet metal structure into two separate narrow sheet metal structures. Each narrow structure independently transmits forces from the luffing cylinder mount, eliminating the need for a wide structure while maintaining adequate force distribution. This segmentation reduces the required sheet metal thickness and overall weight.
Solution Approach 2:
The invention applies local reinforcement at the luffing cylinder mount area through the two narrow sheet metal structures that converge at the mount point. This provides localized strength where forces are introduced, rather than requiring uniform thickness across a wide structure, thereby reducing overall weight while maintaining strength at the critical location.
2Ease of manufacture
If a single-part top metal sheet is used, then the manufacturing is simplified, but the risk of buckling increases due to compressive forces acting perpendicular to the lower shell
Solution Approach 1:
The single-part top metal sheet is replaced by two separate narrow sheet metal structures. This segmentation creates multiple load paths that better distribute compressive forces, reducing the buckling risk. The separate structures can be manufactured independently and then assembled, which maintains ease of manufacture while improving structural reliability.
3Reliability
If additional U buckling braces are added to reinforce the lower shell, then the buckling resistance is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts the buckling resistance function from separate U buckling braces and integrates it into the narrow sheet metal structures themselves. The narrow structures are designed with appropriate geometry and connection details that provide the necessary buckling resistance without requiring additional external braces, thereby reducing device complexity while maintaining reliability.
4Device complexity
If the sheet metal structure presses at points into the lower shell, then the connection is simplified, but unfavorable tension peaks are produced
Solution Approach 1:
The concentrated point pressure from a single wide structure is divided into multiple contact points from two separate narrow structures. This segmentation distributes the tension peaks more favorably across the lower shell, reducing stress concentrations while maintaining connection simplicity through the straightforward bolt mount configuration.
Data Source
AI summary
The present invention relates to a telescopic boom having a coupling section at whose lower shell at least one luffing cylinder mount, in particular a bolt mount, is centrally provided for fastening at least one luffing cylinder, wherein at least two closed sheet metal box structures for the load transmission from the luffing cylinder mount into the structure of the telescopic boom are provided at the support metal sheets of the luffing cylinder mount.