Offset Concave Threshing Bars With Varying Dihedral Angles
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Solution Overview
Problem
Conventional combine harvester concave bar configurations are not optimized to minimize grain damage while maximizing threshing effectiveness, leading to inefficient harvesting and grain loss.
Innovation Solution
A concave bar configuration with varying dihedral angles and surface areas, secured at non-perpendicular angles relative to side support members, featuring cut-outs or grooves that enhance threshing efficiency and minimize grain damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional concave bar configurations are used, then the structure is simple and easy to manufacture, but threshing efficiency is reduced and grain damage increases
Solution Approach 1:
The concave bar is divided into multiple segments along its length, with each segment having different dihedral angles (e.g., first portion with 45-60 degrees, second portion with 60-75 degrees). This segmentation allows optimization of threshing efficiency at different locations while managing overall complexity through modular design
Solution Approach 2:
Different portions of the concave bar are given different local geometries - the first portion has a first dihedral angle optimized for initial threshing, while the second portion has a second dihedral angle optimized for final grain separation. This local quality variation maximizes threshing efficiency without requiring complete redesign of the entire bar
2Object-affected harmful factors
If conventional concave bar configurations are used, then manufacturing is simple, but grain damage is minimized poorly
Solution Approach 1:
The concave bar features local quality variations with different dihedral angles in different portions - the first portion (45-60 degrees) provides gentler initial threshing to minimize grain damage, while the second portion (60-75 degrees) provides more aggressive final separation, thereby reducing overall grain damage while maintaining effectiveness
Solution Approach 2:
The varying dihedral angles along the length of the concave bar create a dynamic threshing action that progresses from gentler to more intense contact points, adapting the threshing intensity to the progressive breakdown of crop material and minimizing grain damage throughout the process
3Productivity
If uniform concave bar configuration is used, then manufacturing is easier, but threshing effectiveness is reduced
Solution Approach 1:
The concave bar is segmented into distinct portions with different dihedral angles that can be manufactured as separate components or as defined features in a single piece, allowing optimized threshing effectiveness while maintaining reasonable manufacturing complexity through standardized production methods
Solution Approach 2:
The invention changes the geometric parameter (dihedral angle) along the length of the concave bar, with the first portion having angles of 45-60 degrees and the second portion having angles of 60-75 degrees. This parameter variation optimizes threshing effectiveness at different stages of the threshing process while remaining manufacturable
Data Source
AI summary
A concave for a combine harvester having a first side support member and a second side support member. The concave can further include a threshing bar secured to the first and second side support members, the threshing bar having a cut-out that extends the length of the threshing bar such that the cut-out defines a first face and a second face for the threshing bar. In addition, the first and second side support members can each include a top surface having a first face and a second face, wherein the first face and the second face of the first and second side support members substantially axially align with the first face and the second face of the threshing bar.