Crawler Crane Fly Jib Self-Positioning and Cable Integration
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Solution Overview
Problem
The existing mobile crane systems face inefficiencies and complexity in the process of extracting and storing a fly jib, particularly due to the labor-intensive nature of managing numerous signal lines and power supply lines between the fly jib and the boom, and the difficulty in guiding these wires to the smaller cross-section fly jib.
Innovation Solution
The mobile crane system incorporates a jib coupling member with a sheave and jib raising/lowering wire rope to hold the fly jib in a fixed orientation, reducing the stroke needed to incline the fly jib and utilizing a CAN communication line with a four-core cable to minimize wire connections, allowing for efficient and simple extraction and storage of the fly jib.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a raising/lowering rope or cylinder is stretched between the boom and the fly jib to raise and lower the fly jib, then the fly jib can be raised and lowered, but the work becomes labor-intensive and time-consuming
Solution Approach 1:
The fly jib is designed to be self-raising and self-lowering through its own weight. When the coupling member is detached from the boom tip, the fly jib automatically raises itself to a horizontal position using its gravitational force, eliminating the need for external raising/lowering ropes or cylinders and significantly reducing operational time and labor
Solution Approach 2:
The complex raising/lowering mechanism (ropes or cylinders) is completely removed from the system. The invention extracts the unnecessary mechanical assistance and relies solely on the fly jib's structural design and weight to achieve automatic positioning
2Ease of operation
If numerous signal lines and power supply lines are stretched between the boom and the fly jib to connect instruments, then the instruments can be connected, but the work becomes troublesome and complex
Solution Approach 1:
Multiple signal lines and power supply lines are bundled together into a single cable assembly that runs through the boom and connects to the fly jib. This merging of multiple wires into one integrated cable dramatically simplifies the connection and disconnection process during fly jib extraction and storage
Solution Approach 2:
The single cable assembly serves multiple functions simultaneously - it carries both signal lines for instrument communication and power supply lines for electrical components, eliminating the need to manage separate cables for each function
3Volume of moving object
If the fly jib is made smaller in cross-section to improve maneuverability, then it becomes easier to store, but guiding numerous wires to the fly jib becomes more difficult
Solution Approach 1:
The cable assembly containing multiple wires is routed through the boom's internal hollow structure and then guided to the fly jib. The wires are nested within the boom's structural cavity, providing protection and easy access without requiring external routing that would be difficult with a compact fly jib design
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 configuration reduces the complexity and time required for extracting and storing the fly jib by minimizing the number of wires and using a more efficient mechanical system, enabling easier operation and communication between the fly jib and the main crane body.
Implementation Method 1
the weight of the fly jib joined to the jib raising/lowering wire rope causes the fly jib to be in a downward orientation of having turned downward
Implementation Method 2
the sheave to which the jib raising/lowering wire rope is stretched moves to the rear end side of the fly jib
Data Source
Figure 1(a)~1(c)
Figure 2
Figure 3(a)~3(b)
AI summary
In a crawler crane (1), while a fly jib (6) is in use, the fly jib (6) is suspended from a coupling flange (13) by a jib raising/lowering wire rope (27) that is wound around a sheave, the sheave being slidably attached to a tip end side section of the fly jib (6). If the sheave (25) is caused to slide by a jib raising/lowering cylinder (26) attached to the fly jib (6), the fly jib (6) suspended from the coupling flange (13) by the jib raising/lowering wire rope (27) inclines with respect to a boom (5). The raising/lowering mechanism of the fly jib (6) is installed on the fly jib side, thus making it possible to easily perform work to extract/store the fly jib.