Crane Undercarriage Pivotable Support Struts
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Solution Overview
Problem
Existing crane undercarriages face challenges in stability and assembly/dismantling efficiency, particularly when transporting large lattice boom cranes, as they require complex assembly work and are not optimized for transport, leading to high operational costs and compliance issues with road traffic regulations.
Innovation Solution
A crane undercarriage design with pivotably mounted support struts on a central part, allowing for easy transition between operating and transport positions, enabling optimal support surface enlargement and compliance with road traffic regulations during transport, while maintaining efficient assembly and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the crane undercarriage uses rigidly formed support struts on the central part, then the structural strength and stability are improved, but the transportability and compliance with road traffic regulations deteriorate due to excessive dimensions
Solution Approach 1:
The support struts are designed to be pivotably mounted on the central part, allowing them to change position between an extended operating configuration and a retracted transport configuration. This dynamic adjustment enables the crane to comply with road traffic regulations during transport while maintaining full structural strength during operation.
Solution Approach 2:
The support struts are divided into movable segments that can be independently positioned. The pivotal connection allows each strut to be rotated into different positions, effectively segmenting the overall structure to reduce transport dimensions without compromising the integrity needed for operational strength.
2Adaptability or versatility
If the crane undercarriage uses detachably mounted crawler carriers, then the adaptability to different support elements is improved, but the assembly and dismantling time increase due to complex assembly work
Solution Approach 1:
The mounting mechanisms for different support elements (crawler carriers, floor support beams) are merged into a unified pivotable connection system. This allows all support elements to be attached through the same pivotal mounting interface, simplifying the assembly process while maintaining adaptability to different support types.
Solution Approach 2:
The central part and support struts are designed with universal mounting features that can accommodate multiple types of support elements. The same pivotal connection structure serves both crawler carrier attachment and floor support beam attachment functions, reducing the need for separate assembly procedures.
3Length of moving object
If the support struts are arranged to not protrude beyond the central part diameter, then the transport dimensions are reduced, but the stability and force distribution deteriorate
Solution Approach 1:
The support struts dynamically adjust their position based on operational needs. During transport, they are retracted to minimize protrusion and comply with dimensional restrictions. During operation, they are extended and positioned to optimize stability and force distribution, achieving both compact transport dimensions and optimal operational stability.
4Length of moving object
If the crane is dismantled into modules for transport, then the transportability is improved, but the assembly work and operational costs increase
Solution Approach 1:
Instead of complete disassembly into separate modules, the crane uses a dynamically adjustable support strut system that can be pivoted into a compact transport configuration. This maintains the integrity of the central part and support structure while achieving the dimensional reductions needed for transport, significantly reducing assembly work compared to full modular disassembly.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The chassis has a base plate (2) designed for detachable mounting of a rotatable crane upper chassis. Several supporting rods (4) are rotatably supported at the base plate for adopting a transport position and an operating position. Supporting units necessary for crane operation are attached at the supporting rods. The base plate has an outer circumference that forms four rotatable hinges (3), where the respective supporting rods are rotatably supported at the hinges. An independent claim is also included for a variable crane comprising a crane lower chassis and a crane upper chassis.