Reinforced Rotary Frame Structure for Lightweight Grader Bends
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Solution Overview
Problem
The existing rotary frames of graders suffer from stress concentration at bends, leading to damage under heavy loads, and increasing the thickness or width to enhance strength results in overweight and overload.
Innovation Solution
A rotary frame design featuring a first connecting member with reinforcing members and connecting members, arranged symmetrically and with gaps, enhancing structural stability and bending resistance while maintaining a lightweight construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness and width of the bends are increased to enhance bending strength, then the bending strength is improved, but the weight of the rotary frame increases causing overload
Solution Approach 1:
The rotary frame is segmented into multiple functional components: a main body portion, a bend portion, and multiple reinforcing members (first reinforcing members extending from ends, second reinforcing members extending from middle portions). This segmentation allows each component to be optimized independently - the bend portion maintains necessary thickness for strength while the reinforcing members provide additional structural support without requiring the entire frame to be thicker, thus improving bending strength without excessive weight gain.
Solution Approach 2:
Reinforcing members are strategically positioned at specific locations where stress concentration occurs - at the ends and middle portions of the bend. The first reinforcing members extend from the ends of the bend toward the main body, while second reinforcing members extend from the middle portion. This local reinforcement approach strengthens the frame precisely where needed to resist bending moments, rather than uniformly increasing the thickness of the entire frame, thereby improving strength with minimal weight penalty.
2Strength
If the thickness and width of the bends are increased to enhance bending strength, then the bending strength is improved, but the rotary frame becomes overweight affecting grader performance
Solution Approach 1:
The rotary frame structure is divided into the main body, bend portion, and multiple distributed reinforcing members. This segmentation allows the bend portion to maintain its original thickness and width dimensions, avoiding weight increase that would affect grader productivity. The reinforcing members are added as separate elements that provide structural strength without requiring the entire frame to be heavier.
Solution Approach 2:
Reinforcing members are placed locally at stress concentration zones (ends and middle of bend) rather than increasing the dimensions of the entire bend. The first reinforcing members extend from the ends toward the main body, and second reinforcing members extend from the middle portion, creating localized strength enhancement. This approach maintains the lightweight design necessary for grader operation efficiency while providing sufficient bending strength.
Data Source
AI summary
A rotary frame includes a first connecting member of the rotary frame has an arc-shaped concave part. Each second connecting member is non-coplanar with the first connecting member and has a mounting hole. A first reinforcing member is connected between a first end of the first connecting member and one of the second connecting members; and another first reinforcing member is connected between a second end of the first connecting member and the other second connecting member. A second reinforcing member is connected between a middle part of a circumferential edge of the first connecting member and one of the second connecting members; and another second reinforcing member is connected between the middle part of the circumferential edge of the first connecting member and the other second connecting member. Middle regions of the first and second reinforcing members joined to the same second connecting member are separate from each other.