Rotatable Threshing Concave Body with Sealing Scraper
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Solution Overview
Problem
Existing threshing concave arrangements in combine harvesters face issues with crop flow disruption due to gaps and high adjustment forces required to change positions, leading to wear and accumulation of crop material.
Innovation Solution
A threshing concave arrangement with a rotatable and lockable body having projections for engagement in one position and a smooth guide surface in another, along with a scraper that forms a sealing contact in the second position, minimizing gaps and adjustment forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the body is rotated between first and second positions when the scraper is in direct contact with the body, then adjustment forces must overcome frictional forces, but this results in high adjustment forces and wear
Solution Approach 1:
The body is designed to be spaced from the scraper in the first position before rotation begins. This preliminary spacing creates clearance that eliminates frictional resistance during the rotation process, allowing the body to be easily rotated to the second position where it then abuts the scraper.
2Ease of operation
If a gap remains between the body and scraper, then rotation is easier, but crop material can accumulate in the gap and disrupt crop flow
Solution Approach 1:
The arrangement allows the body to dynamically change its position relative to the scraper based on operational requirements. In the first position, the body is spaced from the scraper to facilitate easy rotation. In the second position, the body abuts the scraper to eliminate gaps and prevent crop material accumulation, ensuring continuous crop flow during threshing operation.
Data Source
AI summary
A threshing concave assembly for a combine harvester (10) is provided with a threshing concave (34) and a crop handling device located upstream of the threshing concave (36), which comprises a body (66) with projections arranged on its surface. The body (66) is rotatable about a pivot axis (86) extending along the inlet side of the threshing concave (34) between a first position, in which the projections interact with the crop, and a second position, in which a smooth guide surface (70) of the body (66) interacts with the crop, and can be locked in said positions. A scraper (84) is arranged on the inlet side of the threshing concave (34), extending to a position located immediately downstream of the body (66). The body (66) is shaped such that in the first position it is spaced away from the wiper (84) and in the second position it rests against the wiper (84).