Wireless Hopper-Gate Calibration for Consistent Granule Flow
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Solution Overview
Problem
Existing turf applicators face challenges in accurately calibrating spreading and spraying functions, leading to significant variation between machines and over time, with current calibration methods being time-consuming and prone to errors, especially in fleets of equipment.
Innovation Solution
An automated calibration process for turf applicators that uses electronically controlled gates and spray tips, allowing for wireless calibration through a user interface, where the controller determines and saves minimum and maximum flow rates based on input weights and times, minimizing unit-to-unit variation and enabling easy sharing of calibration settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional manual calibration methods are used, then operators can adjust settings, but the process is time-consuming and prone to errors with calibration accuracy only reaching about 80% of target application rate
Solution Approach 1:
The patent replaces manual mechanical calibration processes with an automated electronic system. The controller automatically adjusts the hopper gate position and measures material flow rates, eliminating the need for operators to manually adjust settings and perform repeated trial-and-error calibration. This substitution of mechanical manual operations with automated electronic control and measurement systems directly achieves both higher calibration accuracy and reduced calibration time.
Solution Approach 2:
The calibration system performs self-calibration by automatically measuring its own flow rates at different gate positions and storing the calibration data. The controller autonomously determines the relationship between gate position and material flow rate without requiring external operator intervention or manual measurement procedures, enabling the system to calibrate itself quickly and accurately.
2Reliability
If hopper gate opening is limited to deliver specific amount of granular product, then dispensing control is achieved, but wear over time increases variation and error in delivery accuracy
Solution Approach 1:
The system performs preliminary calibration by establishing the relationship between hopper gate position and material flow rate before actual operation begins. The controller measures flow rates at multiple gate positions and stores this calibration data, so that when operation starts, the system already has the necessary information to accurately control dispensing. This preliminary calibration action compensates for wear effects that will occur during service life.
Solution Approach 2:
The system implements feedback by continuously monitoring material flow rates and comparing them against the calibrated values. When wear causes drift in the hopper gate characteristics, the feedback mechanism allows the system to detect deviations and maintain accurate delivery by adjusting based on the stored calibration relationship between gate position and flow rate.
3Productivity
If multiple machines are calibrated collectively with a single setting, then setup efficiency is improved, but unit-to-unit variation increases and cannot be relied upon
Solution Approach 1:
Each machine performs self-calibration by automatically measuring its own material flow rates at different hopper gate positions and storing the calibration data in its controller. This self-service calibration process ensures that each unit develops its own accurate calibration profile specific to its hardware characteristics, eliminating unit-to-unit variation while maintaining high setup efficiency through automation.
Solution Approach 2:
The calibration process is segmented into individual machine-specific calibrations rather than a collective setting applied to all machines. Each machine's controller independently stores its own calibration data, allowing for machine-specific optimization while the automated process maintains efficiency. This segmentation of calibration data by individual unit resolves the contradiction between efficiency and consistency.
4Duration of action of stationary object
If spray tips are used and allowed to wear, then operational duration is extended, but flow rate increases and accuracy decreases with increased variation between spray tips
Solution Approach 1:
The system performs preliminary calibration of spray tips by measuring their flow rates at different pressures and positions before operation begins. This preliminary action captures the baseline characteristics of each spray tip, allowing the system to compensate for wear that occurs during extended operational duration by referencing the original calibration data.
Solution Approach 2:
The system implements feedback by monitoring spray tip performance against the calibrated baseline. When wear causes flow rate deviations, the feedback mechanism allows detection and compensation, maintaining accuracy over time. The controller can adjust operating parameters or alert operators to recalibrate when variation exceeds acceptable thresholds.
Data Source
AI summary
Implementations disclosed herein are directed to an applicator machine. In some implementations, the application machine includes a frame; a hopper mounted to the frame to hold and dispense a granule product, where the hopper further includes one or more electronically controlled gates; an interface to receive input from a user, where the interface is wirelessly connected with the applicator machine; a calibration key; a controller coupled to the operator control interface and the one or more electronically controlled gates. The controller may calibrate a hopper gate minimum open for a known minimum position, calibrate a hopper gate maximum open for a known maximum position, and save the minimum open flow rate and the maximum open flow rate.