Adjustable Cover System for Crop Harvesting
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Solution Overview
Problem
Existing crop harvesting attachments face issues with uneven row spacing, changes in direction, and harvesting on slopes, leading to inefficient feeding of stalky crops due to temperature-dependent polyethylene covers, resulting in piston jumping or loss of corn cobs.
Innovation Solution
An adjustable cover system for picking units with a tensioning device that alters the mechanical tension and elasticity of the cover, allowing adaptation to different harvesting conditions, preventing piston jumping and optimizing the spring and damping behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the cover surface is made soft to cushion corn cobs, then the cushioning effect is improved, but the cover becomes locally dented and springs back causing cob jumping
Solution Approach 1:
The patent applies the dynamics principle by making the cover elasticity adjustable through a tensioning device. The cover transitions from a static structure to a dynamic one where the elasticity can be changed based on operating conditions. This allows the cover to adapt its cushioning properties and prevent both excessive softness causing denting/springing and excessive hardness causing poor cushioning.
Solution Approach 2:
The patent implements parameter changes by allowing the elasticity parameter of the cover to be adjusted. Through the tensioning device, the mechanical tension in the cover can be modified, thereby changing its elastic properties. This enables optimization of the cushioning effect while preventing cob jumping by finding the appropriate elasticity parameter for different harvesting conditions.
2Stability of the object's composition
If the cover surface is made hard to maintain shape, then structural stability is improved, but the cushioning of corn cobs is poor causing them to pop out
Solution Approach 1:
The cover is transformed from a rigid static structure to a dynamic adjustable structure. The tensioning device enables the cover to change its mechanical properties, allowing it to provide adequate cushioning when needed while maintaining structural stability during normal operation.
Solution Approach 2:
The elasticity parameter of the cover is made variable through the tensioning device. This allows the system to adjust the cushioning parameter dynamically, providing soft cushioning when corn cobs need to be caught and guided, while maintaining sufficient structural integrity to prevent deformation under normal conditions.
3Ease of manufacture
If polyethylene covers are used for picking units, then material availability is improved, but the spring and damping properties become highly temperature-dependent
Solution Approach 1:
The patent addresses temperature dependency by introducing an adjustable tensioning device that compensates for temperature-induced property changes in the polyethylene cover. When temperature changes affect the spring and damping properties, the tensioning device allows manual adjustment to restore optimal performance, thereby achieving temperature independence through parameter adjustment.
4Device complexity
If a fixed elasticity cover is used, then structural simplicity is improved, but adaptation to different harvesting conditions is limited
Solution Approach 1:
The cover system is made dynamic and adjustable through the tensioning device. This allows the elasticity parameter to be changed according to different harvesting conditions such as crop moisture content, cob weight, and field conditions. The additional complexity of the tensioning device is justified by the significant gain in adaptability.
Data Source
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AI summary
The invention relates to a front attachment (1) for harvesting crops standing in rows, comprising at least two picking units (8) arranged axially parallel to each other, each of which is at least partially covered by a cover (13) extending in the longitudinal direction of the picking unit (8), preferably a multi-part cover, wherein the elasticity of the cover (13) is adjustable.