Crane Upper Turning Body Segmented Frame Design
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Solution Overview
Problem
Conventional crane upper turning bodies face challenges in suppressing boom deflection in the left-right direction due to increased size or length, which limits hoisting load capacity, and increasing boom dimensions to address this issue complicates transportation by exceeding transportation width limits.
Innovation Solution
The upper turning body design includes a turning frame with a pair of attachment brackets and a main frame with an increased interval in the left-right direction, allowing for a smaller front-rear dimension, and a subframe or divided frames that can be disassembled to fit within transportation limits, enhancing stiffness and stability while maintaining transportability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the dimension (width) of the boom is increased to enhance stiffness and suppress deflection, then the boom's resistance to left-right deflection is improved, but the transportation width of the turning frame exceeds the transportation limit width
Solution Approach 1:
The turning frame is divided into a main frame and a subframe that can be detached from each other. The subframe carries the boom and can be separated during transportation, allowing the boom to be positioned without increasing the main frame's transportation width. This segmentation enables the boom to have sufficient width for stiffness while the transportation width is controlled by the main frame dimensions.
Solution Approach 2:
The invention changes the dimensional relationship between the main frame and subframe. The subframe extends in the left-right direction to provide boom support, but this extension is accommodated in a way that doesn't increase the main frame's transportation width. The subframe can be folded or repositioned during transportation to fit within width limits.
2Stability of the object's composition
If the interval between attachment brackets is increased to reduce boom deflection, then the boom stability is improved, but the turning frame width must be increased which complicates transportation
Solution Approach 1:
The turning frame is segmented into main frame and subframe components. The attachment brackets are positioned on the main frame with sufficient interval for boom stability, while the subframe provides additional support structure. This segmentation allows the brackets to be spaced apart for stability without requiring the entire turning frame to be wider, simplifying transportation.
3Strength
If the dimension of the main frame in the left-right direction is increased to accommodate larger attachment bracket interval, then the boom deflection is suppressed, but the transportation width exceeds the limit
Solution Approach 1:
The main frame is separated from the subframe that carries the boom. The attachment brackets are positioned on the main frame with adequate interval for deflection resistance, while the subframe extends to provide additional support. During transportation, the subframe can be detached or repositioned, allowing the main frame to maintain sufficient bracket interval without increasing overall transportation width.
Solution Approach 2:
The subframe is designed to be detachable and repositionable, allowing the structure to adapt between operational and transportation states. During operation, the subframe extends to provide boom support; during transportation, it can be folded or removed, dynamically adjusting the width to meet transportation limits while maintaining the main frame's bracket interval for structural integrity.
Data Source
AI summary
An upper turning body mounted on a lower body for a crane includes a turning frame mounted on the lower body to turn freely, and a boom provided to the turning frame to be raised and lowered freely. The turning frame includes a pair of attachment brackets to which a base end section of the boom is attached such that the boom is free to be raised and lowered, and a frame body to which the pair of attachment brackets are provided with an interval in a left-right direction of the upper turning body. The frame body is formed of a plurality of divided frames arranged side by side in the left-right direction of the upper turning body, adjacent divided frames of the plurality of divided frames being separably joined to each other.