Pivotable Threshing Concaves for Uniform Gap Profile
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Solution Overview
Problem
Existing threshing devices have an uneven gap profile between threshing concaves and drums, affecting crop flow and threshing quality, especially when processing different types of crops.
Innovation Solution
The design features pivotable concaves with a common axis, allowing for a uniform basket gap profile and replaceable concave segments with varying perforations or designs to adapt to different crops, along with adjustable de-awning plates and a bar for enhanced threshing and de-awning capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the second concave is rotatably mounted at its end furthest from the first to allow simultaneous distance adjustment, then the adaptability to different crop types is improved, but the gap profile becomes increasingly convex and uneven, worsening the crop flow and threshing quality
Solution Approach 1:
The second concave is divided into multiple segments that can be independently adjusted radially to the second threshing drum. This segmentation allows each section of the concave to be positioned to maintain a substantially uniform gap profile across the entire width of the drum, while still enabling overall adjustment for different crop types.
Solution Approach 2:
The concave segments are made adjustable through a lever arrangement that enables radial movement of each segment relative to the threshing drum. This dynamic adjustment capability allows the gap profile to be optimized for uniformity while maintaining the ability to adapt to different crop requirements.
2Adaptability or versatility
If the concave gap is adjusted radially to adapt to different crop types, then the versatility is improved, but the gap profile widens circumferentially from inlet to outlet, worsening the crop flow
Solution Approach 1:
The second concave is segmented into multiple independently adjustable sections. Each segment can be radially positioned to maintain a uniform gap profile from inlet to outlet, preventing the circumferential widening effect while preserving the ability to adjust for different crop types.
Solution Approach 2:
Different segments of the second concave can be adjusted to different radial positions to create locally optimized gap profiles. This allows each section to maintain uniform spacing relative to the drum surface, ensuring consistent crop flow characteristics throughout the threshing process.
Data Source
Figure 1
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Figure 3
AI summary
The device (3) has two threshing cylinders (4, 5) arranged one behind the other, and two threshing baskets (7, 8) respectively encircling the two threshing cylinders in a circumferential direction. The threshing baskets are adjustable in a radial direction of the threshing cylinders. A crop processing unit and two awner metal plates are arranged at one of the threshing baskets. The threshing baskets are swingable around common axles that connect the threshing baskets, where encirclement of one of the threshing cylinders by the two threshing baskets is equal.