Lowerable Central Roller Set for Combine Harvester Secondary Implement
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Solution Overview
Problem
The existing headers for combine harvesters face issues with damage to the secondary implement when navigating over impediments and during road transport, as the secondary implement is not adequately lifted, leading to potential collisions with the primary implement and other components.
Innovation Solution
A lifting device with a slide element is connected to the secondary implement, allowing it to be lifted relative to the primary implement, and the central roller set is designed to lower automatically when the header is raised, ensuring the secondary implement's blades are positioned above potential collision points, thus protecting them from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the header is lifted to pass over impediments, then the primary implement is raised sufficiently high, but the secondary implement remains too low and risks damage from collision with impediments
Solution Approach 1:
The central roller set is designed to be lowerable relative to the outer roller sets, creating a dynamic adjustment mechanism. When the header encounters impediments, the central roller set can be lowered to provide additional ground clearance for the secondary implement, while the outer roller sets maintain their position for guidance. This dynamic reconfiguration allows the header to navigate over impediments without damaging the secondary implement.
2Productivity
If the secondary implement is positioned close to the ground for even processing, then ground processing efficiency is improved, but the risk of damage when moving over impediments increases
Solution Approach 1:
The system maintains the secondary implement close to the ground during normal operation for efficient ground processing, but enables dynamic lowering of the central roller set when impediments are encountered. This allows the secondary implement to stay low for productivity while having protective ground clearance available when needed for reliability.
3Productivity
If the header is designed for high-cut operation with reduced stem mass, then the primary cutting function is optimized, but the secondary implement is more exposed to damage risk
Solution Approach 1:
High-cut operation optimizes the primary cutting function by reducing stem mass, but this configuration leaves the secondary implement more exposed. The lowerable central roller set provides a protective mechanism that can be deployed when needed, allowing the header to maintain high-cut optimization while having available protection for the secondary implement.
4Device complexity
If the central roller set is fixed at the same level as outer roller sets, then structural simplicity is maintained, but the secondary implement cannot be adequately protected during lifting
Solution Approach 1:
The roller set is segmented into outer roller sets and a central roller set that can move independently. The central roller set is guided on the frame element to be lowerable relative to the outer roller sets, allowing it to be positioned separately for protection during lifting and transport operations while maintaining relatively simple overall structure.
Data Source
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AI summary
A header (2) for a combine harvester (1) has a primary implement (6) and a secondary implement (8) with a roller unit (9). The roller unit (9) has a frame element (37), an outer roller set (10) with a rotatably supported roller (11) and a central roller set (10) with a rotatably supported roller (11). The central roller set (10) is guided on the frame element (37) to be lowerable relatively to the external roller set (10).