Forage Harvester Roller Gap Control With Independent Hydraulics
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Solution Overview
Problem
Existing conditioning units in forage harvesters suffer from slow and imprecise adjustment of the gap width, leading to inefficient and inconsistent crop processing due to fluctuating crop yields and potential misalignment of rollers, which affects crop quality and harvesting efficiency.
Innovation Solution
A self-propelled forage harvester with a conditioning unit featuring independently controllable hydraulic cylinders and a valve assembly that allows for rapid and precise adjustment of the gap width, using working hydraulics to enable independent actuation of the rollers, ensuring alignment and responsive crop processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a multi-chamber pump is used to adjust the gap width, then the adjustment mechanism is simple, but the adjustment speed is very slow
Solution Approach 1:
The adjustment device is segmented into two independent hydraulic cylinders (first and second hydraulic cylinders) instead of using a single multi-chamber pump. Each cylinder can be controlled independently to adjust the gap width, enabling faster response to changes in crop yield while maintaining a relatively simple overall structure.
Solution Approach 2:
The adjustment device transitions from a static, slow-adjustment multi-chamber pump system to a dynamic system with two independently controllable hydraulic cylinders. This allows the gap width to be adjusted rapidly and flexibly in response to varying crop conditions, significantly improving adjustment speed.
2Manufacturing precision
If a multi-chamber pump is used to adjust the gap width, then the structure is simple, but the adjustment precision is poor leading to roller misalignment
Solution Approach 1:
By dividing the adjustment function into two independent hydraulic cylinders positioned on opposite sides of the roller, the system can independently control the gap width on each side. This segmentation enables precise alignment of the rollers while maintaining a simple structural design.
Solution Approach 2:
Each hydraulic cylinder independently controls the local gap width on its respective side of the roller. This local control capability allows for precise adjustment and alignment of the rollers, ensuring uniform gap width across the entire conditioning unit.
3Productivity
If the gap width is adjusted frequently to match crop yield fluctuations, then crop quality is maintained, but the adjustment time increases reducing productivity
Solution Approach 1:
The dual independent hydraulic cylinder system enables rapid and dynamic adjustment of the gap width, allowing the forage harvester to quickly adapt to fluctuations in crop yield. This dynamic adjustment capability maintains high harvesting efficiency while minimizing the time lost during gap width changes.
Solution Approach 2:
The system enables responsive adjustment based on crop yield conditions, allowing operators to frequently adjust the gap width to match varying crop characteristics without significant time loss, thereby maintaining optimal crop quality and harvesting efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables faster, more precise adjustment of the gap width, improving crop quality and harvesting efficiency by aligning rollers and allowing for automated operation, reducing maintenance complexity and potential errors.
Implementation Method 1
The adjusting device comprises a first hydraulic cylinder and a second hydraulic cylinder, which are coupled to the roller movably mounted for adjusting the gap width on sides opposite each other in the direction of the roller's longitudinal axis
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention relates to a self-propelled forage harvester (1) with a conditioning unit (6) comprising a first roller (8) and a second roller (9), wherein one roller of the two rollers (8, 9) is movably mounted such that the distance between the rollers (8, 9) can be changed to adjust the gap width of the conditioning unit (6). The conditioning unit (6) further comprises an adjusting device (22) for adjusting the gap width, wherein the adjusting device (22) comprises a first hydraulic cylinder (23) and a second hydraulic cylinder (24). The self-propelled forage harvester (1) is characterized in that the adjusting device (22) comprises a controllable valve assembly (26) which is designed and configured to supply the two hydraulic cylinders (23, 24) independently of one another with hydraulic fluid provided by a hydraulic source (27).