Telescopic Boom Coupling Section Buckling Resistance
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Solution Overview
Problem
Conventional telescopic boom coupling sections with metal-plate structures face limitations in load-bearing capacity and stability, particularly at tapered corners, which are prone to buckling under disruptive forces like wind or crane inclination, necessitating an enhancement in load-carrying capacity while minimizing weight.
Innovation Solution
The implementation of a metal-plate box structure composed of three partial luffing-cylinder boxes, with two arranged parallel to the lower shell and one transverse to the coupling section, distributing forces into the rigid web walls and incorporating additional stabilizing elements to eliminate tapered corners and increase rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional metal-plate box structure with tapered corners is used to transfer load from luffing cylinders, then the structure can be manufactured with standard processes, but the load-bearing capacity is limited and buckling occurs at tapered corners under disruptive forces
Solution Approach 1:
The metal-plate box structure is divided into three separate partial luffing-cylinder boxes: two arranged parallel to the lower shell and one extending transversely. This segmentation allows each box to be optimized independently, eliminating tapered corners while maintaining load transfer functionality. The parallel boxes transfer vertical loads, while the transverse box provides lateral stability and moment resistance.
Solution Approach 2:
The invention introduces a transverse partial luffing-cylinder box that extends perpendicular to the longitudinal axis of the boom. This adds a third dimension to the load transfer system, enabling the structure to resist moments in multiple directions. The transverse box connects the two parallel boxes, creating a three-dimensional rigid framework that eliminates buckling risks at corners.
2Adaptability or versatility
If the metal-plate box structure is designed to transfer load only in the luffing plane, then the structure can be simplified, but it cannot withstand disruptive forces like wind or crane inclination
Solution Approach 1:
The metal-plate box structure is designed to perform multiple functions simultaneously: the parallel boxes transfer vertical luffing loads, while the transverse box resists lateral moments from wind and crane inclination. The structure universally handles both primary luffing forces and secondary disruptive forces through its three-dimensional configuration, eliminating the need for separate stabilization components.
Solution Approach 2:
By adding the transverse partial luffing-cylinder box that extends perpendicular to the boom axis, the structure gains the ability to resist moments in multiple directions. This dimensional addition enables the same structure to handle both vertical luffing loads and lateral disruptive forces, achieving multi-functionality without requiring separate specialized components.
3Strength
If additional stabilizing elements are added to eliminate tapered corners and increase rigidity, then the load-bearing capacity improves, but the weight of the structure increases
Solution Approach 1:
The stabilizing structure is segmented into three partial luffing-cylinder boxes that are strategically positioned to provide maximum rigidity with minimum material. The parallel boxes are placed directly below the side walls to support vertical loads, while the transverse box is positioned to resist lateral moments. This segmentation allows each component to be optimized for its specific function, avoiding unnecessary material throughout the structure.
Solution Approach 2:
The partial luffing-cylinder boxes are positioned at specific locations where they are most needed: below the side walls for vertical load support and transverse to the coupling section for lateral stability. This localized placement provides maximum structural benefit with minimum material usage, as each box is positioned to address specific stress concentrations rather than uniformly strengthening the entire structure.
Data Source
AI summary
The invention relates to a telescopic boom comprising a coupling section, on the side of which at least two luffing-cylinder mounts are provided for fastening luffing cylinders to the telescopic boom. The bearing plates of the luffing-cylinder mount transition into a metal-plate box structure, the metal-plate box structure being composed of three partial luffing-cylinder boxes.