Centrifugal Spreader Angle Control via Slope Normalization
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Solution Overview
Problem
Centrifugal spreaders face challenges in maintaining uniform fertilizer distribution on sloping cultivation areas due to changing slope gradients, leading to unsatisfactory results and requiring extensive monitoring equipment.
Innovation Solution
A method that measures the slope and actual ejection angle of the first spreading disc, calculates a normalized throw angle, and adjusts the second spreading disc's throw angle to a target angle, allowing for precise control without separate measurement of the second disc's angle, using radar sensors and conversion functions for slope adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar sensors are distributed on each lens to monitor spread patterns, then information about actual throwing angle becomes available for control adjustment, but device complexity increases due to numerous radar sensors and evaluation systems
Solution Approach 1:
The patent uses a single radar sensor to measure the spread pattern of one spreading disc, then creates a normalized model that copies this measurement data to represent the other spreading disc's behavior under similar conditions. This eliminates the need for multiple radar sensors while maintaining measurement capability through mathematical modeling and normalization techniques.
2Measurement precision
If separate measurement of actual throwing angle is performed for both spreading discs, then accurate control of each disc is achieved, but measurement effort and technical complexity increase
Solution Approach 1:
The patent merges the measurement functions by using a single radar sensor to measure one spreading disc's pattern, then combines this measurement with normalization calculations that account for operational differences (slope, speed, fertilizer type) to derive information about the other spreading disc's behavior. This unified approach reduces measurement equipment while maintaining control accuracy.
3Ease of manufacture
If standardized spreading parameters are used from spreading charts, then setup is simplified, but measurement precision deteriorates because fertilizer surface properties change with storage conditions
Solution Approach 1:
The patent implements feedback control by using the radar sensor to continuously measure actual spread patterns during operation, comparing these measurements against target patterns, and automatically adjusting spreading disc positions or speeds to correct deviations. This real-time feedback loop maintains accuracy despite variations in fertilizer properties, eliminating the need for manual parameter adjustments based on storage conditions.
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 uniform fertilizer distribution on sloping areas with reduced technical effort, maintaining target spreading patterns by continuously adjusting the ejection angles based on slope measurements and standardization.
Implementation Method 1
distribute radar sensors on each lens over its usable range of launch angles, which emit radar lobes and provide information about an actual launch angle distribution
Implementation Method 2
centrifugal spreaders, in particular those with two spreading discs arranged next to one another and driven in opposite directions, are suitable for discharging fertilizer on agricultural areas
Data Source
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AI summary
This document describes a method for controlling the discharge angle of a centrifugal spreader (100) and a corresponding centrifugal spreader. The slope (NP, NR) of the centrifugal spreader and the actual discharge angle (AWW1) of a first spreading disc (1) are measured during operation. Furthermore, discharge angles (AWWn1) of the first and a second spreading disc (2) are calculated with respect to the slope, taking into account the slope and the position (PE1, PE2) of the associated fertilizer feed systems. By calculating the actual discharge angle (AWW2) of the second spreading disc from the slope and its normalized discharge angle (AWWn2), the latter can be adjusted to a predetermined target discharge angle under varying slopes. This allows for the maintenance of predefined spreading patterns under different topographical conditions.