Scattering Device Torque Correction for Fertilizer Mass Flow
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Solution Overview
Problem
Conventional centrifugal fertilizer spreaders inaccurately determine mass flow due to neglecting substance-dependent properties of different fertilizers and changes in material properties over time, leading to incorrect fertilizer distribution and potential environmental pollution.
Innovation Solution
A scattering device and method that corrects mass flow determination using a correction variable based on the coefficient of friction, dwell time, ejection angle, and ejection direction, allowing for precise mass flow calculation without requiring new torque-mass flow relationships for various fertilizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If mass flow is determined based on torque of the scattering disk using a previously measured mass flow/torque characteristic curve, then the determination process is simple, but measurement precision deteriorates due to substance-dependent properties of different fertilizers being neglected
Solution Approach 1:
The patent introduces correction variables that account for substance-dependent properties such as coefficient of friction, dwell time, ejection angle, and ejection direction. These parameters modify the basic torque-based mass flow determination to compensate for variations in fertilizer material properties, thereby improving measurement precision without requiring complete redesign of the determination process
Solution Approach 2:
The patent employs feedback mechanisms by measuring actual material properties (coefficient of friction, dwell time, ejection angle, ejection direction) and using these measurements to correct the mass flow determination. This closed-loop approach allows the system to adapt to different fertilizer types and maintain high measurement precision across varying conditions
2Manufacturing precision
If settings are made on the spreading device in advance tailored to the type of fertilizer, then manufacturing precision of the spreading pattern is improved, but adaptability deteriorates when material properties change over time or are not immediately apparent
Solution Approach 1:
The patent transitions from static pre-set settings to dynamic adjustment by continuously measuring material properties (coefficient of friction, dwell time, ejection angle, ejection direction) and adjusting the mass flow determination in real-time. This allows the system to adapt to changing material properties while maintaining spreading precision
Solution Approach 2:
The system performs self-adjustment by automatically detecting material property changes and correcting its own measurements through the correction variables. The spreading device monitors its own performance and compensates for variations without requiring external intervention or manual reconfiguration
3Device complexity
If the same torque-mass flow relationship is used for all fertilizer types, then device complexity is reduced, but measurement precision deteriorates due to frictional influences depending on fertilizer type
Solution Approach 1:
The patent creates a universal determination method that works for all fertilizer types by introducing correction variables. Instead of requiring separate torque-mass flow relationships for each fertilizer type, the single base relationship is enhanced with universal correction parameters (coefficient of friction, dwell time, ejection angle, ejection direction) that adapt the system to any material
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
Enables precise fertilizer application by accounting for frictional influences specific to each fertilizer type, improving distribution efficiency and reducing environmental risks.
Implementation Method 1
a metered mass flow is fed to a rotating scattering disk, which mass flow is discharged by scattering vanes that are arranged on the scattering disk
Implementation Method 2
detecting a torque required to drive the at least one rotating scattering disk
Implementation Method 3
The correction variable can be based on a coefficient of friction of the material on the diffusing disk
Data Source
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AI summary
A spreading device and a method for determining a corrected mass flow rate are provided. For this purpose, the torque of a spreading disc (3), which is intended for dispensing a material, is measured. Based on the measured torque and a correction factor based on a coefficient of friction of the material on the spreading disc (3) and/or a residence time of the material on the spreading disc (3) and/or a discharge angle of the material relative to a feed direction along which the material flow is supplied to the spreading disc (3), and/or a discharge direction of the material, the corrected mass flow rate is determined.