Segmented Top Plate for Combine Harvester Threshing Maintenance
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Solution Overview
Problem
Conventional combine harvesters face challenges in maintenance due to complex structures and inefficient grain removal processes, particularly when dealing with varying crop loads, leading to clogging or excessive grain transfer issues.
Innovation Solution
The design incorporates a detachable arc-shaped top plate that supports the threshing chamber, allowing for easy maintenance and adjustment of dust transfer valves with movable components to adapt to changing crop loads, reducing structural complexity and improving grain removal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the top plate is made swingable and openable upward to enable inspection and cleaning of the threshing device, then maintenance accessibility is improved, but the structure becomes complicated and requires a large space above the vehicle
Solution Approach 1:
The top plate is divided into a front plate and a rear plate that can be independently removed. This segmentation allows maintenance personnel to access the threshing device without requiring the entire top plate to swing open, simplifying the support structure while maintaining ease of repair. The front plate can be removed for general maintenance, while the rear plate remains to support the grain tank.
Solution Approach 2:
The dust transfer valves are extracted from the top plate structure and positioned independently below the top plate. This allows the top plate to be simplified into separate removable plates without the complexity of supporting swingable mechanisms or integrated valve structures, while still enabling maintenance access to both the threshing device and dust transfer valves.
2Ease of operation
If the top plate is made swingable upward for maintenance access, then maintenance operations become possible, but it requires a large space above and complicates the grain tank opening mechanism
Solution Approach 1:
The top plate is segmented into front and rear removable plates, eliminating the need for a large swing arc above the vehicle. Maintenance personnel can remove the front plate to access the threshing device from the front side, requiring minimal vertical space while maintaining ease of operation.
3Device complexity
If the positions of dust transfer valves are fixed to maintain an arc-shaped top plate for regulating threshing cylinder rotation, then structural simplicity is maintained, but grain removal performance decreases when crop load varies
Solution Approach 1:
The dust transfer valves are made adjustable in position along the rotation axis direction of the threshing cylinder. This dynamic adjustment capability allows the feed angle of the dust transfer valves to be changed according to crop load conditions, optimizing grain removal performance for both heavy and light crop loads while maintaining a relatively simple top plate structure.
Solution Approach 2:
The feed angle parameter of the dust transfer valves can be changed by adjusting their positions. When crop load increases, the feed angle is adjusted to prevent clogging; when crop load decreases, the feed angle is adjusted to prevent excessive transfer speed. This parameter adjustment maintains high productivity across varying operating conditions.
4Ease of repair
If the top plate is made detachable along the rotation axis direction to simplify maintenance, then ease of repair is improved, but the support structure becomes more complex
Solution Approach 1:
The top plate is divided into front and rear plates with different support arrangements. The front plate is supported by support portions on the side wall upper end frames, while the rear plate is supported by separate support portions. This segmentation allows each plate to be independently removed for maintenance without requiring complex overall support mechanisms.
Data Source
AI summary
A combine harvester includes a threshing device 4 configured to perform a threshing process of threshing reaped grain culm in a threshing chamber 23, in which the threshing chamber 23 includes a threshing cylinder 31 configured to rotate around a front-rear axis X, and an arc-shaped receiving net 32 provided extending along an outer circumferential portion of the threshing cylinder 31, and a top plate 30 covering an upper portion of the threshing chamber 23 is supported detachably along the rotation axis direction of the threshing cylinder 31.