Construction Machine Frame Intermittent Welding Rigidity
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Solution Overview
Problem
The frame of construction machines, particularly hydraulic shovels, faces challenges in securing the rigidity of support members due to restricted vertical dimensions caused by welding limitations, which affects visibility, component size, and transportation dimensions.
Innovation Solution
The frame design includes a bottom plate with vertically extending plates and support members, where the lower end of the vertical plates is intermittently welded on the top surface, allowing for a non-welded area that increases vertical dimensions and length of the welded part, enhancing the rigidity of support members through notches, recesses, or through openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the lower end of support members is not welded on the top surface of the bottom plate to avoid interference with the welded part, then the vertical dimensions of support members can be increased, but the rigidity of support members becomes difficult to secure
Solution Approach 1:
The welding of vertical plates to the bottom plate is segmented into intermittent welding rather than continuous welding. This allows the support members to extend further downward without interfering with the welded parts, while still providing sufficient structural connection. The segmented welding pattern enables increased vertical dimension while maintaining adequate rigidity through strategic weld placement.
Solution Approach 2:
The welding distribution is optimized locally by creating a non-welded part at a specific location under the breadthwise inner end part of the vertical wall. This local modification allows the support member to extend further without interference, while the surrounding welded areas maintain structural integrity. The local quality change enables increased length while preserving rigidity through concentrated welding in critical areas.
2Ease of operation
If the upper end position of support members is adjusted to avoid visibility degradation and transportation restrictions, then component size can be controlled, but the vertical dimensions of the welded part are restricted
Solution Approach 1:
The solution shifts the optimization focus from the upper end position (vertical dimension) to the lower end position and welding distribution (horizontal and vertical distribution). By controlling the lower end welding pattern and creating non-welded areas, the support members can achieve appropriate upper end positions for visibility and transportation while maintaining sufficient vertical dimension for structural integrity through distributed welding.
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
This design enhances the rigidity of support members by increasing vertical dimensions and welded part length, preventing interference and stress concentration, thus improving the structural integrity and fatigue strength of the frame.
Implementation Method 1
a lower end of said pair of vertical plates is welded intermittently on the top surface of said bottom plate
Implementation Method 2
a breadthwise inner end part of said vertical wall is welded on one breadthwise outer surface of said pair of vertical plates
Data Source
AI summary
To provide a frame of construction machines that can enhance the rigidity of support members. The frame comprises a bottom plate, a pair of vertical plates being disposed spacedly in a width direction on a top surface of the bottom plate and extending longitudinally and vertically, and multiple support members extending toward outside in a width direction from breadthwise outer surface of the pair of vertical plates. At least one of the multiple support members comprises a vertical wall perpendicular to the bottom plate. A breadthwise inner end part of vertical wall is welded on breadthwise outer surface of one of pair of vertical plates. A lower end of the pair of vertical plates is welded intermittently on a top surface of the bottom plate, and there exists a non-welded part where the lower end of the vertical plates is not welded on the top surface of the bottom plate under breadthwise inner end part of the vertical wall.