Telescopic Crane Jib Guying Support for Load Distribution
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Solution Overview
Problem
Vehicle cranes with telescopic main jibs face challenges in achieving optimal load-bearing capacity due to uneven distribution of forces during luffing operations, leading to potential instability and reduced lifting heights.
Innovation Solution
Incorporating a guying support in the middle region of the main jib to guide the luffing cable, which deflects the normal force and stabilizes the jib, thereby relieving individual telescoping sections and eliminating the need for additional guying lines, with the guying support pivotable about a horizontal axis and adjustable in length to optimize support force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional telescopic main jib without middle-region support is used, then the structure is simpler, but the load-bearing capacity is reduced and lifting heights are limited
Solution Approach 1:
The main jib is divided into multiple telescoping sections (first, second, third telescoping sections) that can be extended and retracted independently. The guying support is positioned on the second telescoping section to provide localized support without requiring structural modifications to the entire jib assembly, thus improving load-bearing capacity while maintaining structural simplicity.
Solution Approach 2:
A guying support with a deflection roller is introduced as an intermediary element between the telescoping sections and the luffing cable. This deflection roller guides the luffing cable and distributes forces more evenly across the telescoping sections, preventing excessive loading on individual sections and enabling greater lifting heights without increasing overall structural complexity.
2Stability of the object's composition
If additional guying lines are added to stabilize the main jib, then stability improves, but the device complexity and installation time increase
Solution Approach 1:
The guying support serves multiple functions: it provides lateral support to the main jib, guides the luffing cable through its deflection roller, and distributes forces across the telescoping sections. This multi-functionality eliminates the need for separate guying lines, maintaining stability while reducing device complexity and installation requirements.
Solution Approach 2:
The guying support is designed to be raised and positioned using the existing extension movement of the second telescoping section. As the second telescoping section extends, it automatically raises the guying support into its operational position, eliminating the need for separate manual assembly or additional actuating mechanisms.
3Strength
If the luffing cable is directly fastened to the main jib extension without deflection guidance, then the arrangement is simpler, but uneven force distribution reduces load-bearing capacity
Solution Approach 1:
A deflection roller is introduced as an intermediary element that guides the luffing cable as it passes to the main jib extension. This deflection roller is mounted on the guying support and ensures that the luffing cable forces are distributed evenly across the telescoping sections, preventing excessive loading on any single section and improving overall load-bearing capacity.
Data Source
AI summary
A vehicle crane, such as a mobile crane, includes a main jib and a main jib extension that is mounted thereon and can be luffed by at least one luffing cable. The vehicle crane includes at least one anchoring support that is arranged on the main jib and guides the luffing cable in order to anchor the main jib to provided improved load-bearing capacity.