Guyed Telescopic Boom Using Modular Guying Elements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing guying systems for telescopic booms in mobile cranes are heavy, costly, and prone to tolerances due to the use of guy ropes and guying winches, which affect payload capacity and stability.
Innovation Solution
A guying system using discrete guying elements, such as guy rods, that are connected to one another and directly to the guying support, allowing adjustable lengths without the need for guy ropes or winches, ensuring greater stiffness and reduced weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If guy ropes and guying winches are used in the guying system, then the telescopic boom can be guyed at different extension lengths, but the system becomes heavier and more expensive
Solution Approach 1:
The second guying is divided into multiple discrete guying elements (first guying element, second guying element, third guying element) that can be selectively connected. This segmentation allows the guying system to be adapted to different extension lengths by connecting different numbers of elements, while avoiding the need for heavy winches and ropes.
Solution Approach 2:
The invention extracts and removes the guying winch and winch drum from the system. Instead of using a continuous rope that requires winding and unwinding, the solution uses discrete guying elements that are directly connectable, eliminating the heavy winching mechanism entirely.
2Reliability
If guy ropes are used in the guying system, then the telescopic boom can be guyed, but the system requires high safety factors and has larger diameter due to rope construction
Solution Approach 1:
The invention replaces the expensive, heavy-duty guy rope with simpler, discrete guying elements that can be straight rods or shorter rope segments. These elements require lower safety factors individually and can be more efficiently designed without the need for excessive redundancy required by continuous ropes.
3Ease of manufacture
If guy ropes with twisted strands are used, then the guying can be installed, but the Young's modulus is smaller and stretching is greater compared to guy rods
Solution Approach 1:
The invention changes the physical parameters of the guying elements by offering the option to use straight rods instead of twisted strand ropes. Straight rods have significantly higher Young's modulus and less stretching, while still being installable through the discrete connection system.
4Ease of operation
If guying winches are used for preloading, then the guying can be adjusted, but tolerances result due to windings of different tightness or different rope diameters
Solution Approach 1:
By segmenting the guying into discrete elements of known, fixed lengths, the system eliminates the tolerance accumulation problems associated with continuous ropes and winch windings. Each element's length is precisely defined, and the total length is the sum of discrete segments, providing better dimensional control.
Data Source
AI summary
The invention relates to a mobile crane having a telescopic boom that is luffably coupled to a superstructure and that comprises a coupling section and at least one telescopic section supported therein in a retractable and extendable manner. At least one guying support is fastened to the coupling section and is connected to the coupling section or to the superstructure via a first guying and to a connection piece at a telescopic section via a second guying. In accordance with the invention, the second guying comprises at least two guying elements coupled with one another. The second guying is thereby adjustable in length and is thus adaptable to the extension length of the telescopic boom such that at least one of the mutually coupled guying elements is directly releasably connectable to the guying support. The invention further relates to a guying system for a mobile crane in accordance with the invention, to a method of moving a mobile crane in accordance with the invention into a guyed work position, and to a method of varying the extension length of the guyed telescopic boom of a mobile crane in accordance with the invention.