Harvester Return Pan Grain Steering for Sensor Detection
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Solution Overview
Problem
Agricultural harvester return pan sensors struggle to detect grain falling over large areas due to their size, leading to high costs and reduced responsiveness to individual grain impacts, resulting in incomplete sensing of grain on remote regions.
Innovation Solution
The return pan incorporates inclined surfaces that use gravity to steer grain laterally toward smaller sensors, creating divergent flow paths that accumulate grain in thicker layers, allowing for the use of smaller, more responsive sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large sensor is used to detect grain falling over a wide area, then the sensing coverage is improved, but the cost increases and responsiveness to individual grain impacts decreases
Solution Approach 1:
The return pan upper surface is divided into multiple regions with different inclinations, each region directing grain flow toward specific sensor locations. This segmentation allows multiple smaller sensors to collectively monitor the entire wide area, achieving both cost reduction and maintained responsiveness.
Solution Approach 2:
The inclined surfaces act as intermediaries that redirect grain flow from remote regions toward the sensors. These surfaces accumulate grain in thicker layers at specific locations, ensuring that smaller sensors receive sufficient grain impact for reliable detection without needing to be large.
2Ease of manufacture
If a small sensor is used to reduce cost, then the cost decreases, but the sensing coverage of grain falling on remote regions is lost
Solution Approach 1:
The inclined surfaces perform preliminary action by accumulating grain in thicker layers before the grain reaches the sensors. This pre-accumulation ensures that even small sensors positioned at specific locations can detect grain from remote regions, as the grain is funneled and concentrated toward these sensor points.
Solution Approach 2:
The solution transitions from a two-dimensional sensor area problem to a three-dimensional grain flow control problem. By using inclined surfaces to create divergent flow paths and accumulate grain in vertical thickness, the system enables small sensors to detect grain across a wide horizontal area.
3Quantity of substance
If the return pan is made wide to catch all grain, then the grain collection capability is improved, but the sensor size required increases
Solution Approach 1:
The wide return pan upper surface is segmented into multiple regions with different inclinations, each directing grain flow toward specific sensor locations. This allows the system to maintain wide grain collection capability while using multiple smaller sensors instead of one large sensor.
Solution Approach 2:
The solution addresses the wide area coverage problem by transitioning to three-dimensional grain accumulation. Inclined surfaces create divergent flow paths that concentrate grain into thicker vertical layers at sensor locations, enabling small sensors to effectively monitor wide horizontal areas.
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
This arrangement enables the use of smaller, more cost-effective sensors that generate stronger signals due to the increased grain quantity, improving the detection of grain across the return pan without compromising sensitivity.
Implementation Method 1
a first region with a first inclined surface that uses gravity to steer grain laterally toward an inlet of the first sensor
Data Source
AI summary
A return pan for an agricultural harvester has an inclined upper surface portion, disposed to receive grain from a threshing or separating mechanism and laterally convey grain under the force of gravity to an inlet of a grain flow sensor.