Combine Harvester Chaff Mill Variable-Speed Drive for Power and Wear
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Solution Overview
Problem
Existing weed seed mills in agricultural harvesters operate at a single constant speed, leading to inefficient power consumption, premature wear, and increased operational costs due to unnecessary engine draw, especially when processing minimal chaff.
Innovation Solution
A gearbox is integrated into the drive system to allow the chaff mill rotor to operate at least two different speeds, optimizing power usage and reducing wear by varying the rotational speed based on processing demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the weed seed mill operates at a single constant speed, then the drive system is simple and reliable, but power consumption is high and wear is increased when processing minimal chaff
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a fixed-speed drive system to a variable-speed drive system. The mill rotor speed can now be adjusted dynamically based on processing conditions, allowing the system to operate at lower speeds when processing minimal chaff, thereby reducing power consumption and wear while maintaining the ability to operate at higher speeds when needed.
Solution Approach 2:
The patent implements parameter changes by modifying the operational speed parameter of the mill rotor. Instead of maintaining a constant speed, the system now allows the speed parameter to vary according to processing demands. This is achieved through a variable-speed drive mechanism that can adjust the rotational speed of the mill rotor, enabling optimization of power consumption and wear characteristics.
2Reliability
If the weed seed mill operates at high constant speed, then seed destruction performance is maintained, but mill wear increases and operational efficiency decreases
Solution Approach 1:
The variable-speed drive system allows the mill to dynamically adjust its operational speed. When processing conditions require high speed for effective seed destruction, the system can operate at high speeds. When processing minimal chaff or under lighter loads, the system reduces speed, thereby reducing wear and extending the duration of action and longevity of the mill components.
3Device complexity
If the weed seed mill operates at constant speed, then the drive system is simple, but power consumption is unnecessary when processing minimal chaff
Solution Approach 1:
The system changes the speed parameter dynamically based on processing conditions. When processing minimal chaff, the mill rotor speed is reduced, thereby reducing power consumption and eliminating unnecessary energy draw from the engine. This parameter adjustment is achieved through a variable-speed drive mechanism that responds to processing demands.
Data Source
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Figure 3A~3B
AI summary
A residue processing system for an agricultural harvester includes a chaff mill for processing a stream of chaff containing weed seeds, and a drive system for powering the chaff mill. The drive system includes a gearbox having (i) an input shaft that either directly or indirectly receives power from an engine or other power source of the agricultural harvester, and (ii) an output shaft that is either directly or indirectly connected to a rotor of the chaff mill for rotating the rotor. The gearbox is configured to selectively rotate the output shaft at at least two different speeds such that the rotor of the chaff mill can be rotated at at least two different speeds.