Crane Lower Jib Laid-Down Assembly Between Boom and Strut
Solution Overview
Problem
Conventional crane assembly methods face challenges with the assemblability of jibs and struts, particularly due to space constraints and operational complexities in attaching these components to the boom, leading to inefficient assembly processes.
Innovation Solution
A crane design featuring a lower jib attached to the boom in a laid-down posture between the boom and strut, allowing the boom head to contact the ground and the strut's end to touch the ground, with a separable upper jib, facilitating easier attachment and assembly by reducing interference and improving positional adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the extending-type attaching method is used to attach the jib to the boom, then the assemblability of the jib is improved, but the assembling space required increases
Solution Approach 1:
The jib is divided into an upper jib and a lower jib that can be attached separately to the boom. The lower jib is first attached to the boom in a laid-down state, and then the upper jib is attached to the lower jib. This segmentation allows the assembly to be completed in a more compact space while maintaining ease of assembly.
Solution Approach 2:
The lower jib is attached to the boom in a laid-down posture (horizontal dimension) rather than in a vertical position. This dimensional change allows the assembly to be performed in a smaller vertical space while maintaining the same horizontal footprint, effectively reducing the overall assembling space requirement.
2Area of stationary object
If the enfolding-type attaching method is used to attach the jib to the boom, then the assembling space required is reduced, but the assemblability of the jib deteriorates
Solution Approach 1:
By dividing the jib into upper and lower segments that can be attached in sequence, the invention maintains the compact space advantage of the enfolding-type method while improving assemblability. The lower jib is first attached to the boom, providing a stable base, and then the upper jib is attached, making the overall process easier to perform.
Solution Approach 2:
The lower jib is preliminarily attached to the boom in a laid-down state before the upper jib is attached. This preliminary action creates a stable foundation and establishes the correct spatial relationship, making the subsequent attachment of the upper jib easier and more straightforward.
3Device complexity
If process I is used to attach the strut and jib to the boom, then the attachment sequence is simplified, but the assemblability of the jib deteriorates due to working under the strut
Solution Approach 1:
The invention segments the jib into upper and lower parts, allowing the lower jib to be attached to the boom first (when the strut is not yet attached), and then the upper jib to be attached to the lower jib. This maintains the simplified attachment sequence while avoiding the problem of working under the strut.
Solution Approach 2:
The lower jib is attached in a laid-down posture extending laterally from the boom, rather than vertically under the boom. This dimensional change allows the jib attachment to be performed in a different spatial plane, avoiding interference with the strut attachment process.
4Device complexity
If process II is used to attach the strut and jib to the boom in the extending-type method, then the attachment sequence is maintained, but the assemblability of the strut deteriorates due to working at distal end in high places
Solution Approach 1:
The lower jib is preliminarily attached to the boom before the strut is attached. This creates a stable structural base that supports the subsequent attachment of the strut at the boom's distal end, making the strut assembly easier to perform from a lower, more accessible position.
Solution Approach 2:
The invention creates different local qualities in the structure: the lower jib provides a stable, grounded attachment point for the boom, while the upper jib extends outward to support the load. This local differentiation allows the strut to be attached at an optimized position that balances structural integrity with assembly ease.
Data Source
AI summary
Provided is a crane which comprises a luffing jib including a lower jib and an upper jib coupled to the lower jib in such a manner as to be separable from the lower jib, the lower jib is attached to a head of a boom to have a laid-down posture at a position between the boom and a strut when the upper jib is separated from the lower jib, when the boom is lowered and laid down to allow the head of the boom to come into contact with a ground and when the strut is lowered and laid down to allow a distal end of the strut to come into contact with the ground, and the lower jib has a length which causes no interference with the strut when the lower jib has the laid-down posture at the position between the boom and the strut.