Crane Strut Raising Without Boom-Tip Guide Sheaves
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Solution Overview
Problem
Existing methods for assembling and disassembling cranes are cumbersome, particularly in aligning the main hoisting rope with the guide sheave on the boom, which is difficult at high places with poor scaffolding, and require complex maneuvers to change the towing direction for raising and lowering the jib mast.
Innovation Solution
A crane design incorporating a strut support unit that can be attached to the jib or strut, allowing the rope connection part to be positioned higher than the strut rotation center, enabling the strut to be raised or lowered without the need for guide sheaves, and utilizing a winch to apply a towing force directly to the rope connection part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the main hoisting rope is aligned with the guide sheave on the boom tip, then the towing direction can be changed to the raising direction, but the alignment work becomes extremely difficult and time-consuming at high places with poor scaffolding
Solution Approach 1:
The invention extracts and removes the guide sheave from the system. Instead of requiring the main hoisting rope to pass through a guide sheave mounted on the boom tip, the rope is directly connected to the suspension lug of the jib mast. This eliminates the alignment requirement and the associated difficulties of working at high places with poor scaffolding.
Solution Approach 2:
The invention inverts the conventional approach by connecting the winch rope directly to the jib mast suspension lug instead of using the guide sheave system. This reversal of the connection method eliminates the need for complex alignment procedures and makes the operation much simpler and faster.
2Ease of operation
If a guide sheave is mounted on the boom tip to change towing direction, then the rope can be redirected, but the complexity of the assembly increases and requires additional components
Solution Approach 1:
The guide sheave component is completely removed from the system. The invention simplifies the rope routing by directly connecting the winch rope to the suspension lug, eliminating the intermediate guide sheave and reducing overall system complexity.
Solution Approach 2:
The invention merges the functions of the winch rope and the jib mast connection by directly attaching the rope to the suspension lug. This consolidation eliminates the separate guide sheave component and simplifies the overall assembly.
3Productivity
If the rope connection part is positioned below the strut rotation center, then the strut can be supported on the ground, but the towing force cannot effectively raise the strut to a horizontal position
Solution Approach 1:
The invention changes the vertical dimension of the rope connection point by positioning it above the strut rotation center instead of below. This dimensional change creates a favorable moment arm that enables the towing force to effectively raise the strut to a horizontal position, improving the efficiency of the raising operation.
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
Facilitates easier and safer assembly and disassembly of cranes by allowing the strut to be raised or lowered without the need for complex alignment with guide sheaves, reducing the risk of damage and improving operational efficiency.
Implementation Method 1
the winding motion of the winch to make a towing force act on the rope connection part of the strut toward the winch
Data Source
AI summary
Provided are a crane capable of improving the workability for lowering and raising a strut, and a method for assembling and disassembling the crane. The crane includes a boom including a boom distal end part, a jib including a jib proximal end part, a strut connected to the boom distal end part or the jib proximal end part and raisable and lowerable by vertically rotationally movement about a strut rotation center; a winch, a winch rope wound and delivered by the winch; and a strut support unit attached to the jib back surface or the strut front surface. The strut support unit supports the strut in a fallen posture at a raisable position above the jib in a boom-and-jib fallen state. In the raisable position, a rope connection part to which the rope is connected in the strut is higher than the strut rotation center.