Crane Rear Post Link Mechanism Assembly
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Solution Overview
Problem
Existing crane assembly methods require the use of an auxiliary crane to vertically raise and position the rear post, which complicates the assembly and disassembly process and reduces workability, especially when the boom is in a horizontal position.
Innovation Solution
A post driving device with a link mechanism and hydraulic cylinder that rotates the rear post within a defined range, allowing it to be raised and positioned without an auxiliary crane, enabling improved assembly and disassembly workability and enhanced jib hoist rope winding capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an auxiliary crane is used to vertically raise the rear post, then the rear post can be positioned, but the assembly process becomes more complex and workability decreases
Solution Approach 1:
The crane's own post driving device with link mechanism performs the rear post positioning function, eliminating the need for external auxiliary equipment. The system uses its existing structural components (boom, jib, linking member) to accomplish what previously required separate equipment.
Solution Approach 2:
The post driving device serves multiple functions: it positions the rear post during assembly, enables the boom to be in horizontal position for ground-level operations, and facilitates jib hoist rope winding. This multi-functionality replaces the specialized auxiliary crane.
2Productivity
If the rear post is raised vertically using an auxiliary crane, then positioning is achieved, but assembly and disassembly time increases
Solution Approach 1:
The boom is preliminarily positioned in horizontal position before rear post installation, and the post driving device is pre-configured to enable immediate positioning operations. This preliminary preparation eliminates time-consuming vertical lifting operations.
Solution Approach 2:
The integrated post driving device performs positioning operations using the crane's own power and structural components, eliminating the time required to set up, operate, and dismantle auxiliary cranes.
3Ease of operation
If the rear post is positioned in traditional manner, then support function is achieved, but sheave alignment for rope winding is difficult
Solution Approach 1:
The post driving device enables dynamic positioning of the rear post, allowing operators to precisely adjust and align sheaves during rope winding operations. The link mechanism provides controlled movement that facilitates accurate alignment.
Solution Approach 2:
The link mechanism acts as an intermediary between the post driving device and the rear post, providing controlled transmission of motion that enables precise sheave alignment for optimal rope winding.
Data Source
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AI summary
A crane (100) includes: a boom (103); a jib (104); a front post (108) that is swingably attached to a tip end side of the boom; a rear post (109) that is swingably attached to the tip end side of the boom; a post-side pendant member (141), with one end of the post-side pendant member being attached to a tip end of the rear post; and a boom-side pendant member (142), with one end of the boom-side pendant member being attached to another end of the post-side pendant member, and another end of the boom-side pendant member being attached to the boom. The crane further includes a post driving device having a link mechanism that rotates the rear post in a range including a position at which the rear post is swung down to the front post side and a position at which the rear post is swung down to the boom side, while the boom is held down in a horizontal position.