Conditioner Roll Tread Pattern for Uniform Windrow Thickness
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Solution Overview
Problem
Conventional crop header systems with rotary disc cutterbars produce non-uniform windrow thickness due to uneven crop material discharge, leading to inefficient drying and increased thrust loads on conditioner roll bearings.
Innovation Solution
A conditioner roll tread pattern featuring angled ribs and grooves that intermesh with a reversed pattern on a parallel roll, coordinated with the transverse locations of converging and diverging crop flows to laterally disperse the crop material, creating a more uniform mat thickness and reducing concentration at the roll ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional single chevron or spiral tread patterns are used on conditioner rolls, then the structure is simple, but the crop mat is not laterally dispersed and windrow thickness remains non-uniform
Solution Approach 1:
The tread pattern is segmented into multiple discrete chevron groups arranged in a specific sequence around the roll circumference. Each chevron group laterally disperses crop material in a specific direction, and the coordinated arrangement of multiple groups creates a complex dispersal pattern that uniformizes windrow thickness without requiring an overly complex single continuous pattern
Solution Approach 2:
The tread pattern employs periodic chevron groups that repeat at specific intervals around the roll circumference. The pattern includes transition zones where the chevron angle reverses, creating a periodic action that systematically redirects crop flow throughout the entire roll perimeter, ensuring continuous and uniform lateral dispersion of crop material
2Productivity
If crop material is concentrated between converging cutters, then cutting efficiency is maintained, but the crop mat becomes non-uniform and creates thrust loads on bearings
Solution Approach 1:
The invention converts the harmful concentrated crop streams from converging cutters into a beneficial uniform distribution pattern. The tread pattern's chevron groups are specifically positioned to receive these concentrated streams and redirect them laterally, transforming the problematic non-uniform input into a uniform windrow output, while the periodic transition zones balance the forces to minimize thrust loads on bearings
3Manufacturing precision
If crop material is dispersed laterally, then windrow uniformity improves, but crop material may concentrate at outboard ends and become entangled with header structure
Solution Approach 1:
The tread pattern applies different chevron angles and orientations at different locations around the roll circumference. Specific chevron groups are positioned to direct crop flow away from outboard ends where entanglement risks exist, while other groups handle dispersion in the central regions. This localized variation in tread pattern quality ensures uniform dispersal without creating concentration zones at vulnerable locations
Data Source
AI summary
A conditioner roll tread pattern comprising a plurality of equally circumferentially spaced ribs separated by grooves extending across the axial length of the conditioner roll. The ribs are angled relative to the axial centerline, either with a fixed positive/negative angle or a continuously varying angle alternating between positive and negative extremes. The conditioner roll is configured to work in conjunction with a paralley disposed roll of similar tread pattern configuration, reversed end-for-end so that the ribs of one roll intermesh with the grooves of the adjacent roll. The location of the transition points at which the angle reverses along the axial length are coordinated with the transverse locations of converging and diverging crop flows being discharged from a forwardly disposed rotary disc cutterbar in a manner that results in a crop mat having more uniform thickness being discharged from the conditioner.