Harvester Pickup Drum Counter-Tool Geometry for Crop Stripping
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Solution Overview
Problem
Existing harvesting machines face issues with incomplete crop stripping, particularly with long-stalked crops, leading to malfunctions and damage due to crops winding or getting stuck on drum components.
Innovation Solution
A pick-up device with a drivable drum and counter-tools that protrude beyond the scraper area, allowing the counter-tools to guide and support the crop transfer to scrapers, ensuring complete stripping by adjusting the scraper and counter-tool contours for optimal crop handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drum rotates with pick-up tines to pick up crops, then crop collection is achieved, but crops may wind on the drum or get stuck on projections causing malfunctions and damage
Solution Approach 1:
The invention extracts the problematic crop material from the drum surface by introducing scrapers that actively remove and discharge crops before they can wind or get stuck. The scrapers are positioned to contact the drum surface and continuously strip off crops, preventing them from adhering to the drum or its projections during rotation.
Solution Approach 2:
The scrapers act as intermediary elements between the drum and the crop material. Instead of crops directly contacting and winding on the drum surface, the scrapers intervene to strip off the crops and discharge them, thereby mediating the interaction and preventing harmful adhesion or winding.
2Productivity
If scrapers are used to strip crops from the drum, then crop removal is achieved, but incomplete stripping occurs with long-stalked crops leading to winding and sticking
Solution Approach 1:
The invention segments the crop stripping function into multiple components: multiple scrapers arranged around the drum, counter-tools positioned at specific locations, and coordinated rotation. This segmentation allows different parts of the drum to be addressed by appropriate scraping mechanisms, ensuring complete stripping even of long-stalked crops that would otherwise be missed by a single scraping element.
Solution Approach 2:
The invention applies local quality by positioning scrapers and counter-tools at specific locations on the drum where crop accumulation is most likely to occur. The counter-tools are strategically placed to address specific problem areas, providing localized enhanced scraping action where needed most, rather than uniform treatment across the entire drum surface.
3Productivity
If counter-tools protrude beyond the scraper area to guide crop transfer, then crop transfer support is improved, but device complexity increases
Solution Approach 1:
The invention merges the functions of the drum surface, scrapers, and counter-tools into a unified integrated structure. The counter-tools are formed as continuous elements with the drum or attached as integral components, and the scrapers are positioned to work in coordinated combination with the counter-tools. This merging allows multiple functions (support surface, scraping action, crop guidance) to be achieved through a cohesive structure rather than separate discrete components.
Data Source
Figure 1~2
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AI summary
The invention relates to a receiving device (10; 10'; 10"; 10‴; 10"") on a harvesting machine (100), such as a forage wagon, a baler, a forage harvester, or a haymaking machine. The receiving device (10; 10'; 10"; 10‴; 10"") comprises: - a driven drum (11) with a rotating axis (46) and with a drum shell (12) having an outer radius (R1), - receiving tines (13) arranged on the drum (11), the legs (14) of which project outwards beyond the outer radius (R1) of the drum (11) and which have an outer radius (R2) relative to the rotating axis (46) and pick up harvested material, preferably straw and leaves, from the ground when the drum (11) is rotating, a scraper comb (15) with scrapers (16) arranged thereon, which have a wiper outer contour (17) and terminate in a free end (18), the free end (18) having a distance (R3) from the axis of rotation (46),which is equal to or greater than the outer radius (R1) of the drum (11), so that the free end (18) conforms to the radial circumferential contour of the drum shell (12) when the drum (11) is rotating. Under unfavorable conditions, especially with long-stemmed crops, there is a risk that the crop will not be stripped off the scrapers (16) as desired, but will instead wrap around the drum (11) or become lodged on protrusions. To facilitate the stripping of the harvested crop by the strippers (16), it is proposed that the drum (11) be made from a bent sheet metal blank (51) and include flat sections (57) for attaching the receiving tines (13), wherein at least one counter tool (20; 20'; 20"; 20"; 20"); is arranged on the drum (11) of the receiving device (10; 10'; 10"; 10‴; 10"") which has an outer contour (27; 27'; 27"; 27‴; 27"") which, in the assembled state, has an outer radius (R4) relative to the axis of rotation (46).which is greater than the distance (R3) of the free end (18) of the scrapers (16) to the axis of rotation (46) and smaller than the outer radius (R2) of the receiving tines (13), so that at least a partial area of the counter tool (20; 20'; 20"; 20‴; 20"") slides along at least a partial area of the scraper outer contour (17) when the drum (11) is rotating and supports the removal of the crop material picked up by the receiving tines (13) by the scrapers (16).