Agricultural Sensor Flow Separation Edge
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Solution Overview
Problem
Electronic devices in agricultural distribution machines for detecting granular material face contamination issues such as dust and moisture accumulation, leading to reduced precision and reliability, and existing solutions like narrowing the delivery line are prone to clogging.
Innovation Solution
A flow break-off edge is introduced along the delivery line to create turbulence, preventing contaminants from settling, and a recess is designed to enhance self-cleaning effects, combined with a conical section to increase air flow speed and minimize impact contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conveying line is narrowed upstream of the measuring chamber to reduce contaminant accumulation, then the sensor assembly is protected from contamination, but the conveying line becomes more susceptible to clogging
Solution Approach 1:
The conveying line has different cross-sectional areas at different locations: a larger cross-section in the approach area and a narrowed cross-section at the measuring chamber. This local variation allows the line to maintain low clogging susceptibility in the approach area while protecting the sensor assembly in the measuring chamber
Solution Approach 2:
Instead of uniformly narrowing the conveying line, the invention introduces a dimensional change by creating a localized narrowing only at the measuring chamber area, while maintaining adequate cross-section elsewhere. This spatial differentiation resolves the contradiction between protection and clogging risk
2Measurement precision
If the measuring chamber is enlarged to improve sensor detection, then detection precision improves, but contaminant accumulation increases
Solution Approach 1:
The measuring chamber is enlarged only in the region where sensor detection is required, while the conveying line sections upstream and downstream maintain smaller cross-sections. This localized enlargement allows improved detection without proportionally increasing contaminant accumulation throughout the entire system
Solution Approach 2:
The sensor assembly and measuring chamber are effectively separated from the main contaminant flow path by the narrowed conveying line sections, extracting the sensitive detection area from the harmful contamination environment while maintaining adequate detection volume
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 solution significantly reduces the tendency for the device to become dirty and enhances operational reliability by preventing contamination accumulation and improving the self-cleaning effect within the sensor field of view.
Implementation Method 1
The flow separation edge is designed such that the airflow, which is largely laminar along the conveying line, at least partially detaches from the wall of the conveying line in the measuring chamber and/or is transformed into an at least partially turbulent airflow, exhibiting eddies. Such turbulent flows or eddies largely prevent the settling of contaminants such as dust, pickling solution, or the like in the respective edge or wall areas of the conveying line.
Implementation Method 2
The sensor device may be provided, which is designed like one or more optical sensors, in particular infrared or radar sensors.
Data Source
Figure 1
Figure 2
Figure 3a
AI summary
Electronic device (40) for detecting granular material (G), in particular seeds and/or fertilizer, within an agricultural distribution machine (10), with at least one conveying line (41) through which the granular material (G) can be conveyed by means of an airflow (L), and at least one sensor device (50) associated with the conveying line (41), which is configured to detect the granular material (G), in particular in the form of individual grains, without contact within a measuring chamber (51) of the sensor device (50) arranged along the conveying line (41).In order to further improve such electronic devices (40), in particular by reducing the tendency to become dirty and/or increasing operational reliability, at least one flow separation edge (60) is provided, which is arranged along the conveying line (41), preferably directly in front of and/or in the measuring chamber (51), and which is designed to at least partially separate and/or swirl the airflow (L) in the area of the measuring chamber (51).