Crane Load Hook Control Device for Wind Stability
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Solution Overview
Problem
Lattice mast cranes face instability and swaying issues when raising large loads under high wind conditions, limiting the maximum permitted wind speeds and increasing operational costs due to the need for precise and stable load alignment.
Innovation Solution
The integration of winches on the bottom hook block with control ropes connected to the crane boom to secure and precisely orient the load, combined with a widened roller head and pulley blocks for enhanced resistance against rotation, allows for improved load alignment and stability, enabling operation at higher wind speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large loads are raised at great heights, then the hoisting capability is improved, but the load becomes more susceptible to wind forces causing swaying and oscillation
Solution Approach 1:
A stabilizing guy rope connection is introduced as an intermediary element between the load frame and the crane structure. This guy rope acts as a mediator that transfers and distributes wind forces from the load to the crane boom, preventing direct transmission of destabilizing forces to the load while maintaining hoisting capability at great heights.
2Stability of the object's composition
If maximum permitted wind speed limits are enforced for safety, then load stability is improved, but operational efficiency and productivity deteriorate
Solution Approach 1:
The stabilizing guy rope connection serves as a force distribution intermediary that enables the crane system to safely operate at higher wind speeds by actively managing and distributing wind forces. This allows expansion of maximum permitted wind speed limits while maintaining adequate load stability, thereby improving operational efficiency without compromising safety.
3Manufacturing precision
If precise alignment of the load is required during installation, then installation quality is improved, but the time and complexity of the operation increases
Solution Approach 1:
The stabilizing guy rope connection provides self-aligning characteristics where the geometric arrangement and tensioning of the guy rope automatically guide the load into the correct position. This self-service alignment mechanism reduces the need for complex manual positioning operations, achieving precise load alignment while minimizing installation time and operational complexity.
Data Source
AI summary
A crane, in particular a lattice mast crane, having a bottom hook block with a load suspension means, in particular a load hook, wherein the bottom hook block has at least one winch whose outgoing control rope is connected or connectable to the crane boom for securing and/or aligning the load position or bottom hook block position.