Crane Strut Raising Method Using Swingable Portion and Rope
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Solution Overview
Problem
Existing crane systems require significant force and auxiliary cranes to raise heavy and long struts, which is inefficient and costly, and often necessitates high-performance lifting equipment.
Innovation Solution
A method and crane design that incorporates a strut with a swingable portion and restriction mechanism, allowing the strut to be raised by pulling a rope to swing the swingable portion upward and rearward, then using a pulling-returning rope to align the strut body with the boom, eliminating the need for an auxiliary crane by distributing the force effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an auxiliary crane is used to lift the entire strut, then the strut can be raised, but high-performance auxiliary cranes with high withstand load and long lifting height are required
Solution Approach 1:
The strut is divided into a strut body portion and a swingable portion that can swing relative to each other. The pulling-raising rope is attached only to the swingable portion, allowing it to be lifted separately first, then the strut body is lifted independently. This segmentation enables the use of lower-capacity lifting equipment compared to lifting the entire strut at once.
Solution Approach 2:
The swingable portion is designed to swing upward and rearward relative to the strut body during the raising process. This dynamic movement allows the swingable portion to be pulled up by the rope while the strut body remains relatively stationary initially, then the strut body is raised afterward. This dynamic approach distributes the lifting process into manageable stages with lower force requirements.
2Ease of operation
If a rope is pulled to raise the strut from a height position adjacent to the installation surface, then the strut can be raised, but an extremely large force is required because the force can only be applied in a direction close to horizontal
Solution Approach 1:
By segmenting the strut into a strut body and a swingable portion, and attaching the rope only to the swingable portion, the system allows the swingable portion to be lifted first. This creates a more favorable force angle during lifting, reducing the horizontal force component and enabling more efficient force application.
Solution Approach 2:
The swingable portion's ability to swing upward and rearward creates a dynamic lifting mechanism where the force direction can be optimized during the process. As the swingable portion rises, the pulling direction naturally transitions from horizontal to more vertical, reducing the required pulling force compared to lifting the entire strut from a horizontal position.
3Productivity
If the swingable portion is swung upward and rearward, then the strut can be raised efficiently, but the swingable portion must be returned to its original position and coupled to the strut body
Solution Approach 1:
The swingable portion is designed with a coupling mechanism that allows it to be separated from and reattached to the strut body. This segmentation enables the swingable portion to be swung upward for lifting, then returned and securely coupled to the strut body, providing both operational efficiency and structural integrity.
Solution Approach 2:
The coupling mechanism between the swingable portion and strut body is designed to allow dynamic separation and reattachment. The swingable portion can swing freely during the lifting phase, then be returned and coupled to the strut body in the final phase, providing both operational flexibility and structural stability.
Data Source
AI summary
Disclosed is a technique of executing: a fixing step of coupling a pulling-raising rope 171 to a vicinity of a distal end 73 of a strut 70; a first raising step of pulling the pulling-raising rope 171 rearwardly to cause a swingable portion 78 of the strut 70 to swing upwardly and rearwardly; a second raising step of pulling the pulling-raising rope 171 rearwardly until a strut body portion 76 has a rearwardly inclined posture with respect to a vertical direction; a strut returning step of pulling a pulling-returning rope 23a forwardly to a position where a forward swinging movement of the swingable portion 78 with respect to the strut body portion 76 is restricted; and a coupling step of coupling the swingable portion 78 and the strut body portion 76 to each other in a non-swingable manner.