Telescopic Crane Single Guide Cable Load Stabilization
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Solution Overview
Problem
Existing crane systems face challenges in stabilizing large rotor blades for wind turbines due to increased forces in control cables affecting guying forces and lifting capacity, and additional weight and cost from multiple winches and ropes.
Innovation Solution
A crane design utilizing a single guide cable tensioned parallel to the boom's longitudinal axis, connected to the load hook via control ropes, with a winch system that synchronizes tensioning based on crane movements, reducing side loads and allowing for precise load alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple control cables and winches are used to stabilize the rotor blade, then the load stabilization is improved, but the weight and complexity of the equipment increases
Solution Approach 1:
The patent extracts the guying function from the control cable system, using a separate Y-guying system for boom stabilization while the control cables only perform load positioning. This separation eliminates the need for multiple complex control mechanisms while maintaining load stabilization through the frame and control cable arrangement.
Solution Approach 2:
The control cables serve multiple functions: they stabilize the rotor blade during lifting, enable precise positioning at the mounting height, and work in conjunction with the frame structure. The frame itself provides both structural support and stabilization, reducing the need for additional dedicated stabilization equipment.
2Manufacturing precision
If control cables are tensioned to stabilize the rotor blade, then the load positioning precision is improved, but the forces in the cables increase and affect the lifting capacity
Solution Approach 1:
The stabilization function is segmented into two independent systems: the Y-guying system handles boom stabilization, while the control cables handle load positioning. This segmentation allows control cables to operate with lower tension forces since they only need to position the load, not stabilize the entire boom system.
Solution Approach 2:
The frame acts as an intermediary structure between the load hook and the rotor blade. It distributes and absorbs forces, allowing control cables to work with reduced tension while maintaining positioning precision. The frame structure converts cable tensions into structural loads that are more efficiently handled by the crane boom.
3Ease of operation
If additional winches and ropes are attached to the jib foot, then the load control capability is improved, but the weight and costs of the equipment increase
Solution Approach 1:
The existing crane winch and hoist rope are used for multiple functions: primary lifting, load positioning, and stabilization control. The control cables work in conjunction with the existing frame structure rather than requiring separate winches, eliminating redundant equipment while maintaining full load control capability.
Solution Approach 2:
The frame structure with control cables provides self-stabilization capability without requiring additional powered winches at the jib foot. The system uses the existing crane propulsion and control mechanisms to tension and adjust the control cables, making the additional equipment self-sufficient using existing resources.
Data Source
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AI summary
The invention relates to a crane, in particular a telescopic crane, with a frame suspended from the load hook for holding a specific load, in particular a rotor blade of a wind turbine. According to the invention, a single guide cable without a guying function is provided, which extends from the boom base in the same direction as the longitudinal axis of the boom system and is attached to the boom system at its end, wherein a frame suspended from the load hook is connected to the guide cable via at least two control cables.