Combine Harvester Feed Roll Paddle Vane Design
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Solution Overview
Problem
The presence of V-shaped guide vanes in the central area of a feed roll in combine harvesters diminishes the effectiveness of object removal, such as stones, from the threshing rotors, compromising energy efficiency and object deflection capabilities.
Innovation Solution
A feed roll design featuring multiple upright paddles oriented parallel to the rotation axis, with V-shaped guide vanes in the central area, where paddles or paddle portions are strategically placed between the blades of the V-shaped vanes to enhance object deflection and maintain crop flow, thereby improving the capability to deflect stones and other objects away from the threshing rotors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If V-shaped guide vanes are applied in the central area of the feed roll, then crop guidance and energy efficiency are improved, but object removal capability is diminished
Solution Approach 1:
The feed roll surface is divided into different zones with different structures: V-shaped guide vanes in the central area for crop guidance, and upright paddles in the lateral areas for object removal. Each zone has optimized local properties suitable for its specific function, resolving the contradiction between crop guidance and object removal.
Solution Approach 2:
The feed roll surface is segmented into multiple functional areas with different paddle configurations. The central area contains V-shaped guide vanes while lateral areas contain upright paddles, allowing simultaneous optimization of crop flow guidance and object deflection capabilities in different spatial zones.
2Productivity
If V-shaped guide vanes are applied in the central area of the feed roll, then crop trajectory is improved, but object deflection capability is compromised
Solution Approach 1:
Different regions of the feed roll are assigned different structural qualities: the central area has V-shaped guide vanes optimized for crop flow guidance, while lateral regions have upright paddles optimized for object deflection. This local differentiation allows each region to excel at its specific function without compromising the other.
Solution Approach 2:
The feed roll is segmented into functional zones where upright paddles are positioned in lateral areas for object removal and V-shaped guide vanes are positioned in the central area for crop guidance. This spatial segmentation enables simultaneous optimization of both crop flow efficiency and object deflection capability.
Data Source
AI summary
A feed roll includes paddles mounted upright on a cylindrical surface of the roll and oriented parallel to its rotation axis, and V-shaped vanes in a central area of the feed roll. One or more paddles or paddle portions are located in the central area. The paddles or paddle portions may be located between the blades that define the V-shaped vanes, i.e. blades which extend between a top point at or near the tip of the V-shape and a base point at the base of the V-shape. Paddles may be present between the base points of one or more of the V-shaped vanes, and additional intermediate paddles may be located between the top points and the base points of the blades. The paddles or paddle portions in the central area enhance the capability of deflecting objects away from the threshing rotors downstream of the feed roll in a combine harvester.