Air Pressure Sensors for Combine Sieve Plugging Detection
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Solution Overview
Problem
Agricultural combines face issues with crop residue plugging, leading to downtime and reduced productivity due to insufficient warning systems for plugging conditions and blockages in discharge systems, which can result in inefficient operation and maintenance.
Innovation Solution
A system comprising air pressure sensors mounted on a shoe within the combine, positioned above and below a sieve, to detect changes in air pressure and identify blockages, allowing for early warning and prevention of plugging by comparing pressure readings and adjusting operational parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no detection system is installed, then the combine operates without additional complexity, but plugging conditions are not detected until discharge stops, causing downtime and loss of productivity
Solution Approach 1:
The patent replaces mechanical observation methods with electronic pressure sensing technology. Pressure sensors mounted on the clean grain collector continuously monitor air pressure changes that indicate plugging conditions, transforming a mechanical detection problem into an electronic measurement system that provides reliable early warning without significant complexity
Solution Approach 2:
The patent introduces air pressure as an intermediary parameter to detect plugging conditions. Instead of directly detecting crop residue blockages, the system uses air pressure changes in the cleaning system as an indirect indicator, allowing reliable detection of plugging before discharge stops while maintaining system simplicity
2Measurement precision
If pressure sensors are mounted above and below the sieve, then blockage detection accuracy is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent segments the pressure measurement function into two distinct locations: one sensor above the sieve and one below the sieve. This segmentation allows each sensor to measure pressure at a specific point, and by comparing the two readings, the system achieves high detection precision while keeping each individual sensor mounting simple and manufacturable
3Productivity
If the combine continues operating without detection systems, then productivity is maintained, but actual plugging occurs requiring shutdown for cleaning and causing downtime
Solution Approach 1:
The patent implements preliminary detection of plugging conditions by continuously monitoring air pressure changes before actual blockage occurs. The system provides early warning signals that allow operators to take preventive action during normal operation, eliminating unplanned shutdowns and cleaning downtime while maintaining continuous productivity
Solution Approach 2:
The patent establishes a feedback loop where pressure sensor readings are continuously monitored and compared against threshold values. When pressure changes indicate developing plugging conditions, the system provides feedback to the operator through warnings or alerts, enabling timely corrective action that prevents complete blockage and maintains productivity
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 system effectively detects the onset of plugging conditions, reducing downtime and maintaining productivity by providing timely alerts and automatic adjustments to prevent blockages in the discharge path of crop residue.
Implementation Method 1
one or more air pressure sensors fixedly mounted to the shoe, the one or more air pressure sensors operable for sensing an air pressure condition in the space and across the sieve
Data Source
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AI summary
An agricultural combine (20) comprises: a body (22) having a plurality of interconnected walls defining a space (24) for receiving a stream of chaff from a separating system (38) of the combine (20); a cleaning system (52) disposed either in or beneath the space (24), the cleaning system (52) including a sieve (56) mounted to a shoe (59); and one or more air pressure sensors (100) fixedly mounted to the shoe (59), the one or more air pressure sensors (100) operable for sensing an air pressure condition in the space (24) and across the sieve (56).