Threshing Drum Cutting Ring for Crop Flow Distribution
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Solution Overview
Problem
The existing combine harvester systems face challenges in efficiently dividing the crop flow between axial separating rotors, leading to potential compression and blockages during the transfer from the threshing device to the separating device.
Innovation Solution
A threshing drum equipped with a cutting ring that extends around the drum body, featuring a cutting edge with a larger radius than the impact edges of the beater bars, effectively separates plant material in the central area, directing it to specific inlet areas and preventing blockages by cutting through plant material, thereby improving crop flow distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the crop flow is transferred directly from the threshing drum to the separating device without additional guidance structures, then the device complexity is reduced, but the crop flow distribution becomes uneven causing compression and blockages in the inlet areas
Solution Approach 1:
The inlet area of the separating device is divided into multiple inlet areas (first inlet area and second inlet area) with corresponding inlet wings on the separating rotors. This segmentation allows the crop flow to be distributed to multiple entry points simultaneously, preventing compression and blockages that would occur with a single inlet area.
Solution Approach 2:
The patent introduces intermediate structures including a first guide element and a second guide element that actively guide and distribute the crop flow from the threshing drum to the respective inlet areas. These guide elements act as intermediaries to ensure even distribution without requiring complex additional guidance structures throughout the entire system.
2Device complexity
If the crop flow is concentrated to a single inlet area, then the device complexity is reduced, but the separating rotors cannot process the crop material efficiently leading to bottlenecks
Solution Approach 1:
The separating device is equipped with multiple separating rotors (first separating rotor and second separating rotor), each with its own inlet area and inlet wings. This segmentation of the separation function across multiple rotors allows the system to handle larger crop flows efficiently without concentrating all material through a single inlet point.
Solution Approach 2:
The patent distributes the crop flow in the longitudinal direction by creating multiple inlet areas positioned at different locations along the separating rotors. This dimensional distribution allows crop material to be processed simultaneously at multiple points along the length of the separating rotors, improving overall processing capacity.
3Ease of operation
If the inlet wings are positioned far from the threshing drum, then the crop flow transfer is simpler, but the crop material is not effectively directed to the separating rotors causing flow distribution problems
Solution Approach 1:
The guide elements are positioned to actively direct and pre-position the crop flow before it reaches the inlet areas of the separating rotors. This preliminary action of guiding ensures that crop material is properly oriented and distributed to the correct inlet areas before entering the separation process, improving directional control without requiring the inlet wings to be positioned far from the threshing drum.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cutting ring ensures smooth and efficient transfer of crop material to the separating device, preventing blockages and ensuring reliable separation by clearly allocating plant material to the left and right inlet areas, thus enhancing the overall processing efficiency.
Implementation Method 1
The cutting edge is configured to cut plant material, in particular plant residues
Implementation Method 2
The beater bars are designed to come into contact with the harvested crop and exert impact energy on the harvested crop, so that the crop is threshed
Data Source
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AI summary
Threshing drum (5) comprising a drum body (12) and a plurality of beater bars (13), wherein the beater bars (13) each have a beater edge (15) which describes a circumferential circle (16) around a central axis (11) of the drum body (12), on which the respective beater edge (15) rotates in a beater radius (31) around the central axis (11) during intended operation of the threshing drum (5).To provide a threshing drum designed to improve the flow of harvested material during its transfer from a threshing unit to a downstream separating unit, the invention proposes a cutting ring (17) arranged centrally on the drum body (12) when viewed longitudinally, which rotates circumferentially around the drum body (12). The cutting ring (17) has at least a circumferential cutting edge (18) that describes a circumferential circle (30) whose cutting radius (21), measured with respect to the central axis (11), is larger than the impact radii of the impact edges. Combine harvesters with a threshing drum according to the invention.