Asymmetric Picking Roller Unit for Stalk Crop Harvesting
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Solution Overview
Problem
Existing picking roller units for harvesting stalked crops require complex assembly due to the need for precise alignment of knife blades and intake edges, leading to increased assembly effort and potential errors.
Innovation Solution
A picking roller unit design featuring oppositely driven picking rollers with rotationally symmetrically arranged first and second tools, allowing for simplified assembly by enabling 90° rotational symmetry, which simplifies the installation process and ensures precise positioning without requiring defined drive shaft alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two second tools (knife blades) are arranged on each of the two picking rollers with precise alternating positioning, then the cutting and tearing efficiency is improved, but the assembly complexity and precision requirements increase
Solution Approach 1:
The patent applies asymmetry by arranging the two second tools (knife blades) on only one of the two picking rollers instead of symmetrically on both. This asymmetric configuration reduces assembly complexity while maintaining cutting efficiency, as the single roller with knife blades works in conjunction with the four first tools on the opposite roller to achieve the required cutting and tearing action during harvesting operation
2Reliability
If two second tools are arranged on each picking roller with alternating positions, then the functional performance is improved, but the assembly precision and error-proneness increase
Solution Approach 1:
The patent extracts the second tools (knife blades) from both picking rollers and places them on only one roller. This extraction simplifies the assembly process by reducing the number of precision-critical interfaces, thereby improving reliability without requiring high assembly precision. The functional performance is maintained through the coordinated action of the remaining tools
3Stability of the object's composition
If four first tools are arranged rotationally symmetrically on each picking roller, then the structural balance is improved, but the positioning precision requirements between rollers increase
Solution Approach 1:
The patent applies asymmetry by having the four first tools arranged rotationally symmetrically on one picker roller while the opposite roller has only two second tools arranged differently. This asymmetric configuration reduces the positioning precision requirements between rollers, as the symmetric roller provides stable balance while the asymmetric roller with fewer tools creates fewer critical alignment interfaces
Data Source
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AI summary
The present invention relates to a picking roller unit (6) for a front-end device for harvesting stalked crops, wherein the picking roller unit (6) comprises a pair of picking rollers (7l, 7r) driven in opposite directions, on each of which four first tools (15) are arranged rotationally symmetrically to the longitudinal axis (LA) of the picking rollers (7l, 7r), wherein the first tools (15) have angled edges (17) projecting in the radial direction, the enveloping circles (23) of which mesh with one another, wherein adjacent edges (17) of one picking roller (7l, 7r) have intermediate spaces (24) located between them within the enveloping circle (23), which extend along the longitudinal direction of the picking roller (7l, 7r) and into which the edges (17) of the adjacent opposite picking roller (7l, 7r) during one revolution of the two picking rollers (7l, 7r), whereby only on one of the two picking rollers (7l, 7r) two second tools (18) are additionally arranged,which are arranged 180° symmetrically to the longitudinal axis (LA) of the picking roller (7l, 7r).