Construction Machinery Cabin Upper Frame Load Dispersion
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Solution Overview
Problem
Conventional upper frames for construction machinery cabins fail to effectively disperse excessive vertical or rearward loads during rollover accidents, leading to plastic deformation and inadequate support of the cabin structure.
Innovation Solution
The proposed upper frame structure includes a center frame with a lower plate and lateral plate, featuring a cabin supporting structure composed of transverse and vertical members spaced apart from the cabin's base plate, which are welded or bolted to the center frame to distribute loads and minimize deformation. This structure can be formed through casting, forging, or bending, with additional support members attached to the side channel to reinforce the cabin's upper surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pillars or reinforcing members are provided in the cabin structure to protect the operator, then the cabin can disperse vertical or rearward loads, but the upper frame cannot effectively support the dispersed load when the cabin is plastically deformed
Solution Approach 1:
The upper frame is segmented into multiple load-bearing components including the center frame, side frames, and specifically the transverse member positioned beneath the cabin. This segmentation allows the load dispersion function to be distributed across multiple structural elements rather than relying solely on the cabin pillars, enabling the transverse member to independently support vertical and rearward loads when the cabin structure is compromised
Solution Approach 2:
The transverse member acts as an intermediary structural element between the cabin base plate and the center frame. It mediates the load transfer by providing an additional support path that bypasses the cabin pillars, allowing forces to be transmitted directly to the center frame through the transverse member and vertical member connection, thus protecting the operator even when cabin pillars fail
2Strength
If the cabin structure is designed to disperse loads through pillars and reinforcing members, then operator protection is improved, but the structure cannot prevent plastic deformation under excessive vertical or rearward loads
Solution Approach 1:
The transverse member is positioned asymmetrically beneath the cabin, spaced apart from the base plate, creating an offset support structure. This asymmetric configuration provides a load path that is independent of the symmetric cabin pillar arrangement, allowing the transverse member to engage and support loads without requiring the cabin pillars to maintain their structural integrity
Solution Approach 2:
The transverse member and vertical member assembly pre-establishes a load support system that is activated before cabin pillar failure occurs. This prior cushioning structure is designed to engage and bear loads in advance, preventing the transmission of excessive forces to the cabin pillars and base plate, thereby preventing plastic deformation before it occurs
Data Source
AI summary
A structure of an upper frame for supporting a cabin of construction machinery, whereby, in the event of a rollover accident, an excessive vertical load or rearward load applied to a cabin structure is primarily dispersed by a reinforcing member of the cabin structure, and the dispersed load is supported by a separate cabin supporting structure, so that the plastic deformation of the cabin structure can be minimized.