Adaptive Cleaning System for Combine Harvesters
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Solution Overview
Problem
Traditional wind-sieve cleaning systems in combine harvesters are inefficient for high-yield rice crops due to high water content and inability to adapt to changing crop varieties and operating conditions, leading to poor performance and low operational efficiency in China's rice-producing regions.
Innovation Solution
A multi-duct cleaning system with an adaptive control apparatus, including a centrifugal fan, grain loss monitoring sensor, grain impurity ratio monitoring system, and on-line monitoring and control system, which adjusts operating parameters such as sieve opening, fan speed, and air intake direction to optimize grain separation and impurity ratio monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional single-channel centrifugal fan and double-layer vibrating screen cleaning system is used, then the structure is simple, but the cleaning efficiency is low and cannot adapt to high-yield rice crops with high water content
Solution Approach 1:
The cleaning system is divided into multiple independent channels (first cleaning channel, second cleaning channel, third cleaning channel) with separate centrifugal fans and vibrating screens for each channel. This segmentation allows each channel to handle specific cleaning tasks independently, improving overall cleaning efficiency while maintaining manageable system complexity through modular design
Solution Approach 2:
The system employs adjustable vibrating screens with variable vibration frequencies and amplitudes, and centrifugal fans with adjustable rotation speeds. These dynamic adjustments allow the cleaning system to adapt to different crop conditions (such as high water content rice), significantly improving cleaning efficiency without requiring complete system redesign
2Adaptability or versatility
If manual adjustment of cleaning system parameters is used, then the system structure is simple, but the adaptability to changing crop varieties and operating conditions is poor
Solution Approach 1:
The system incorporates sensors to detect grain loss rates and cleaning quality in real-time, feeding this information back to the control system. The controller automatically adjusts vibrating screen parameters and centrifugal fan speeds based on this feedback, enabling the system to adapt to different crop varieties and operating conditions without manual intervention
Solution Approach 2:
The cleaning system performs self-adjustment through automatic control algorithms that monitor cleaning effectiveness and autonomously optimize operating parameters. This self-service capability allows the system to maintain high adaptability to varying crop conditions while minimizing the need for operator expertise and manual parameter adjustments
3Adaptability or versatility
If large and medium-sized combine harvesters from foreign manufacturers are used, then the cleaning system is advanced, but they cannot adapt to China's southern super-rice producing areas with deep mud and small plot sizes
Solution Approach 1:
The combine harvester is designed with localized adaptations for China's southern rice-producing regions, including a compact chassis suitable for small plots and deep mud conditions. The cleaning system is specifically optimized for high-water-content rice crops, with adjustable parameters tailored to local crop characteristics, ensuring both environmental adaptability 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
The adaptive cleaning system improves the efficiency and adaptability of combine harvesters, reducing grain loss, increasing operational reliability, and enabling efficient harvesting of various crops, including rice, wheat, and soybeans, while reducing maintenance needs and enhancing overall performance.
Implementation Method 1
A single-channel centrifugal fan is used to produce clear air, using the difference in suspension velocity among grains, short straws, chaff and small amount of miscellaneous fines
Implementation Method 2
using the difference in suspension velocity among grains, short straws, chaff and small amount of miscellaneous fines
Implementation Method 3
combine with a double-layer vibrating weaving sieve or fish scale sieve to complete the separation of the grains and straws
Data Source
AI summary
A combine harvester self-adaptive cleaning control apparatus, includes a return plate, a cleaning sieve, a cleaning centrifugal blower, an impurity collection and stirring auger, a grain collection and stirring auger, a cleaning grain loss monitoring sensor, a grain tank grain impurity rate automatic monitoring apparatus, and an on-line monitoring and control system. The on-line monitoring and control system is connected to the cleaning centrifugal blower, the cleaning grain loss monitoring sensor, the grain tank grain impurity rate automatic monitoring apparatus, and a power driving mechanism of a louver sieve having an adjustable opening. Also disclosed is a self-adaptive cleaning method of the cleaning apparatus which can automatically adjust various working parameters according to a working quality of a working process, control failure rate, and improve a down-time working time for the apparatus.