Combine Harvester Threshing Drum Guide Elements
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Solution Overview
Problem
Existing combine harvesters face inefficiencies in deflecting crop flow from tangential threshing devices to axial separating devices, leading to blockages, especially when multiple separating rotors are used and the crop flow is not evenly divided.
Innovation Solution
Incorporating circumferentially distributed crop guide elements on the front drum to deflect the crop flow evenly to both sides, allowing for targeted feeding into the separating device, potentially omitting the need for a feed drum and optimizing energy usage by guiding the crop flow gently and efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a feed drum is used to transfer crop flow from the threshing drum to the separating device, then the crop can be conveyed, but the device complexity increases and energy consumption increases
Solution Approach 1:
The patent removes the feed drum from the system entirely. The crop flow is transferred directly from the threshing drum to the separating device through optimized flow guidance, eliminating the intermediate feed drum component and its associated complexity while maintaining conveyance functionality
Solution Approach 2:
The functions of the feed drum are merged into the existing threshing drum and separating device structure. The threshing drum's rotation and the separating device's positioning work together to achieve crop flow transfer without requiring a separate feed drum mechanism
2Productivity
If the crop flow is not evenly distributed to multiple separating rotors, then the separating capacity increases, but blockages occur in the front section of the separating unit
Solution Approach 1:
The patent divides the crop flow into multiple streams using guide elements on the threshing drum. These guide elements distribute the crop flow evenly to multiple separating rotors, preventing overload of any single rotor and avoiding blockages while maintaining high separating capacity
Solution Approach 2:
The patent employs guide elements with specific geometries positioned at particular locations on the threshing drum to control the local distribution of crop flow. The guide elements are strategically placed to ensure even dispersion of crop material across all separating rotors, preventing blockages in the front section
3Productivity
If the crop flow is deflected sharply from the tangential threshing unit to the axial separating unit, then the transition is achieved, but grain breakage increases
Solution Approach 1:
The patent uses curved guide elements on the threshing drum that gently guide the crop flow through a smooth transition from tangential to axial direction. The curved geometry of these guide elements prevents sharp deflections, reducing grain breakage while maintaining efficient flow transition to the separating unit
Data Source
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AI summary
The invention relates to a self-propelled combine harvester (1) comprising a tangential threshing unit (2) and an axial separating unit (3). The threshing unit (2) has a tangential pre-drum (4), a tangential threshing drum (5) downstream of the pre-drum (4) in the direction of flow of the crop stream, and a separating basket (6) that at least partially encloses both the pre-drum (5) and the threshing drum (5). Furthermore, the separating unit (3) is downstream of the threshing unit (2) in the direction of flow of the crop stream (32) and comprises at least one axial separating rotor (7, 8). According to the invention, the pre-drum (4) has circumferentially distributed material guiding elements (15) in a central area (14) which are suitable for deflecting a crop flow (32) supplied to the pre-drum (4) to both sides (16, 17) of the central area (14).