Jib Boom Tower Crane Segmented Counter-Jib Spire
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Solution Overview
Problem
Existing overhead slewing luffing jib tower cranes face challenges with heavy and complex counter-jib spire systems that complicate transport, assembly, and disassembly due to size and weight, requiring precise assembly and high manufacturing costs.
Innovation Solution
The counter-jib spire system is divided into three trusses with articulated connections, allowing for lighter components and reduced manufacturing costs, and a detachable roller block for the luffing cable mechanism facilitates easier transport and assembly by eliminating the need for manual rope reeving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the counter-jib spire system is designed as a single heavy component, then structural strength is improved, but transportability and assembly ease deteriorate
Solution Approach 1:
The counter-jib spire system is divided into three separate trusses (counter-jib truss, spire truss, and revolving frame truss) that can be transported and assembled separately. This segmentation allows each component to be lighter and easier to handle during transport and assembly, while still forming a structurally sound complete system when connected.
2Ease of operation
If the counter-jib spire system is divided into separate trusses, then assembly ease is improved, but manufacturing precision requirements worsen
Solution Approach 1:
The connections between the trusses utilize articulated joints that allow for dynamic adjustment and tolerance compensation during assembly. This dynamic connection system enables the trusses to be assembled with reasonable tolerances without requiring extreme precision, as the articulated joints can accommodate minor deviations and self-align the components.
3Device complexity
If manual rope reeving is required for luffing cable installation, then device complexity is reduced, but assembly time and labor requirements increase
Solution Approach 1:
The roller block is pre-attached to the spar during manufacturing, preparing the luffing cable mechanism for direct installation during assembly. This preliminary preparation eliminates the need for manual rope reeving operations at the construction site, significantly reducing assembly time and labor requirements while maintaining relatively simple device complexity.
Data Source
Figure 1
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AI summary
The invention relates to a jib boom rotating tower crane, wherein the counterweight/pinnacle system is divided into three trellises, a rotating frame trellis, a counterweight trellis, and a pinnacle trellis, wherein the counterweight trellis has a common side with each of the pinnacle trellis and the rotating frame trellis. The pinnacle trellis preferably comprises a beam to which a pulley block with a reeved luff cable can be attached.