Converging Drum Ramp Features for Crop Direction
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Solution Overview
Problem
Wider crop and forage mowing implements face challenges in efficiently directing mowed crop material laterally inward toward the center for processing, especially when the material needs to be moved vertically to align with narrow horizontal openings in processing systems.
Innovation Solution
The converging drum features a body that rotates about a central longitudinal axis and includes radially extending ramp features forming acute angles. These ramp features can present either descending or ascending surfaces depending on the rotational direction, allowing for efficient directional control of crop material either upward or downward.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the width of mowing implements is increased to meet the capacity of modern balers and forage harvesters, then the processing capacity is improved, but the difficulty in directing mowed crop material laterally inward toward the center increases
Solution Approach 1:
The converging drum is segmented into multiple ramp features (first group and second group) disposed at different angular positions around the central longitudinal axis. Each ramp feature independently directs crop material toward the center, collectively solving the material distribution problem across the wider implement width.
Solution Approach 2:
The ramp features extend radially outward from the exterior surface of the drum body, adding a radial dimension to the material directing function. This radial extension creates effective ramp surfaces that guide material laterally inward while the drum rotates, transforming rotational motion into radial material convergence.
2Manufacturing precision
If processing systems use narrow horizontal openings between rollers to process mowed crop material, then the processing precision is improved, but the requirement for precise vertical positioning of crop material increases
Solution Approach 1:
The ramp features are configured to present dynamically changing ramp surfaces during rotation. By adjusting the angular orientation of ramp features, the system can switch between presenting ascending ramp surfaces (for upward material movement) and descending ramp surfaces (for downward material movement), enabling dynamic vertical positioning of crop material to match the narrow horizontal opening requirements.
Solution Approach 2:
The acute angle of ramp features relative to the reference plane can be varied to change the steepness and direction of ramp surfaces. This parameter adjustment allows optimization of material flow characteristics to achieve precise vertical positioning for processing through narrow openings.
3Productivity
If ramp features are added to the converging drum to direct crop material vertically, then the crop handling efficiency is improved, but the device complexity increases
Solution Approach 1:
The ramp features serve multiple functions: they direct crop material laterally inward toward the center during drum rotation, and simultaneously provide vertical direction control by presenting ascending or descending ramp surfaces. This multi-functionality achieves improved crop handling efficiency without requiring separate vertical directing mechanisms, thereby limiting the increase in device complexity.
Data Source
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AI summary
A converging drum (54) for a crop mowing implement (20) includes a body (56) that extends along a central longitudinal axis (60). The body (56) rotates about the central longitudinal axis (60) in a defined rotational direction. At least one ramp feature extends radially outward from the body (56), relative to the central longitudinal axis (60). The ramp feature is arranged to form an acute angle (84) relative to a reference plane (86). The acute angle (84) may open toward the defined rotational direction to move cut crop downward, or the acute angle (84) may open away from the defined rotational direction to move crop upward, to position the cut crop for a conditioning system. The converging drum (54) may include a first group (100) of ramp features (76) near a second end (64) of the body (56) for moving cut crop downward, and/or a second group (102) of ramp features (76) near a first end (62) of the body (56) for moving cut crop upward.