Crane Telescopic Boom Spatial Guying During Erection
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Solution Overview
Problem
Long boom systems with spatial guying face challenges during erection as the unguyed telescopic boom can reach its load limits, leading to significant deflections from the ideal luffing plane due to weight and wind forces, with existing solutions not effectively protecting the boom during telescoping operations.
Innovation Solution
The method involves guyeing the main boom via spatial guying during telescoping, with the guying force being adjusted synchronously with the boom's length to minimize deflections, using a crane controller to manage the guying force and ensure the boom remains in the ideal line by varying the guying force based on detected deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the main boom is telescoped out during erection, then the lifting capacity and reach are increased, but the boom deflects significantly from the ideal luffing plane due to weight and wind forces
Solution Approach 1:
The spatial guying is pre-assembled and attached to the boom sections before telescoping operations begin. The guying structure is prepared in advance with proper tensioning mechanisms in place, so that when telescoping starts, the boom is immediately supported and constrained to remain in the ideal luffing plane, preventing deflection rather than correcting it later
Solution Approach 2:
The spatial guying acts as an intermediary support structure between the boom and the supporting surfaces. It provides lateral stability and prevents the boom from deflecting during telescoping by distributing the weight and wind forces through the guying system, allowing the boom to extend without compromising alignment precision
2Reliability
If the spatial guying is tensioned during telescoping operation, then the boom is protected against deflections, but the complexity of the erection process increases
Solution Approach 1:
The tensioning mechanism for the spatial guying is merged with the existing telescoping drive system. The same hydraulic or mechanical components that power the telescoping motion also control the tensioning of the guying, eliminating the need for separate tensioning devices and reducing overall system complexity while maintaining boom stability throughout the telescoping operation
Solution Approach 2:
The guying tension is made dynamic rather than static. The tensioning force is automatically adjusted during telescoping based on real-time boom position and load conditions, allowing the system to maintain optimal stability without requiring manual intervention or complex fixed-tension mechanisms. The guying tension varies dynamically to match the changing structural demands during extension
3Manufacturing precision
If the boom is guyed during telescoping operation, then deflections are minimized, but the additional load on the telescoping drive increases
Solution Approach 1:
Rather than applying full guying tension throughout the entire telescoping stroke, the system applies partial tension only when and where needed. The guying tension is modulated to provide sufficient support during critical phases of extension while remaining minimal during phases where the boom structure is inherently stable, thereby reducing the cumulative load on the telescoping drive while still achieving the required alignment precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the additional load on the telescoping drive and maintains the boom's alignment within the ideal luffing plane, effectively protecting it from deflections and maintaining operational safety by dynamically adjusting the guying force in response to changing boom lengths and deviations.
Implementation Method 1
the spatial guying substantially consists of the guy stranding 13 and the guy supports 16 attached to the boom articulation piece in a V-shaped manner
Implementation Method 2
The force F of the load 202 acts on the tip of the telescopic boom 1 and deflects the same
Implementation Method 3
using a crane controller to manage the guying force and ensure the boom remains in the ideal line by varying the guying force based on detected deviations
Data Source
AI summary
A method for telescoping a main boom includes guying the erected main boom during the telescoping operation, the main boom consisting of a telescopic boom which is guyed via a spatial boom guying. Further, a crane may include a telescopable main boom, a spatial guying and a crane controller, wherein the crane controller determines the necessary guy dimension of the spatial guying in dependence on the current main boom length during the telescoping operation.