Concave MOG Limiter Assembly for Grain Capture and MOG Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The separation of grain from material other than grain (MOG) in agricultural harvesting is inefficient, leading to grain loss, damage, and increased dockage penalties due to foreign material, particularly in high-yield and varying moisture conditions, and current concave designs are cumbersome to adjust for different crops.
Innovation Solution
The use of MOG limiting devices, such as Quarter Wrap MOG limiters and cover plates, which are adjustable and easily attachable to concaves to control gap sizes and retain MOG within the rotor chamber while allowing grain to pass efficiently, improving threshing efficiency and reducing sieve loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large openings are provided in the concaves to allow expedited removal of kernels, then grain loss is reduced, but large volumes of MOG enter the cleaning system overwhelming the grain processing system
Solution Approach 1:
The concave structure is segmented into multiple sections with varying gap sizes. The front section has larger gaps for efficient grain removal, while the rear section has smaller gaps to restrict MOG passage. This segmentation allows simultaneous optimization of grain ejection and MOG retention without requiring a single uniform gap size throughout the concave.
Solution Approach 2:
Different portions of the concave are given different local qualities in terms of gap dimensions. The front portion features larger openings optimized for grain flow, while the rear portion features smaller openings optimized for MOG restriction. This local differentiation resolves the contradiction by allowing each section to perform its specific function optimally.
2Manufacturing precision
If the crop is retained within the threshing chamber for a sufficiently long time to allow complete separation of grain from pod or plant covering, then separation efficiency is improved, but the crop may be damaged by continued threshing forces
Solution Approach 1:
The concave gap size is made dynamic rather than static, with the gap gradually increasing from front to rear along the threshing chamber. This dynamic configuration allows the crop to be processed differently at different stages: tighter gaps in the front provide controlled retention for separation, while progressively larger gaps toward the rear facilitate timely grain ejection before excessive threshing damage occurs.
3Device complexity
If conventional concave designs are used without adjustment, then equipment simplicity is maintained, but efficiency decreases when transitioning between different crops with varying moisture and yield conditions
Solution Approach 1:
The concave is designed with universal applicability for multiple crop types by incorporating a gradient gap structure that adapts to different material characteristics. The varying gap sizes along the concave length allow it to effectively process different crop types and moisture conditions without requiring complete redesign or adjustment, achieving multi-functionality while maintaining relative structural simplicity.
Data Source
AI summary
A MOG limiting device, herein described as a MOG limiter, approximates a portion of the curvilinear length of a concave. The MOG limiting device can include a connection point near the middle of a concave, slightly offset from center. A bolt, washer and nut assembly protrudes downwardly from the underside of the concave. Two assemblies are positioned in the middle of each side of the concave. The assemblies cooperate with a mounting plate on the MOG limiters to form an upper concave connection and a lower concave connection in each half of the concave. In the cross frame, insert slots are positioned to receive a hinge point located at the end of each arced member making up the frame (rail supports). The hinge points are slidably inserted into the opening and then rotated upwardly to be positioned adjacent to and in conformity with the curvature of the underside of the concave with the connection assemblies holding the MOG limiter in place.