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Variable Rate Application Equipment and Mechanisms

Variable Rate Application Equipment and Mechanisms. Introduction. Mapping or on-board sensors Requirement for rapid changes in rate Requirement for accurate and precise rate acquisition Requirement for accurate and precise distribution and deposition. Principles of Chemical Application.

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Variable Rate Application Equipment and Mechanisms

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  1. Variable Rate Application Equipment and Mechanisms

  2. Introduction • Mapping or on-board sensors • Requirement for rapid changes in rate • Requirement for accurate and precise rate acquisition • Requirement for accurate and precise distribution and deposition

  3. Principles of Chemical Application • Perfect uniformity not possible • Physical laws dictate rate and distribution • Metering and distribution device designs control performance

  4. Liquid Metering‘Controlling the rate of flow’

  5. Orifice Flow

  6. AgChem Variable Rate Applicator

  7. Case-Tyler-Capstan Air command System

  8. How do we change rates and treat small areas? • Valves must operate at high speeds • Valves must enable stepping of rates – e.g. 1x, 2x, 4x combinations for 1x, 2x, 3x, 4x, 5x, 6x, 7x, and off rates Variable Rate Spray Nozzles Sensor Assy. Sensed Area

  9. Patchen Cartridge Valve • Designed as part of the Weedseeker sense/spot-spray system • Poppet-type cartridge valve

  10. Patchen Schematic • Discharge Coefficient: 0.07 gpm/(psi^0.5) • Steady State Current Requirement: 0.32 Amps

  11. Variable Rate Spray Nozzles Sensor Assy. Sensed Area Why Minimum Treatment Distance? • Need application resolution to match sensed resolution • Treatment Distance is a function of a minimum treatment time and ground speed.

  12. Tri-valve Set for Varying Rate • Stepped rates -1x, 2x, 3x, 4x, 5x, 6x, 7x and off • Can treat 0.6 by 0.6 m area applying the target rate on 85% of that area

  13. Stepped Application Using a 3 Valve Set

  14. OSU/GreenSeeker Unit 1 N-Fertilizer Applicator

  15. GreenSeeker RT200 GreenSeeker RT500

  16. GreenSeeker RT200 GreenSeeker RT500

  17. Estimated Price $15,000 for 60 ft applicator Senses and treats boom width by 20 to 30 feet Utilizes existing variable rate sprayer controllers and valves Combination Sense and Treat, and Sense, Predict, and Treat strategies Reaction time limited by existing controller and valves Estimated Price $60,000 for 60 ft applicator No Longer Manufactured Senses and treats each 2 ft by 2 ft area Uses NTech high speed and high resolution controller and valves Sense and Treat strategy Reaction time < 0.1 s RT500 RT200 RT200 and RT 500 Specifications

  18. Reaction time limited by existing controller and valves Capstan Pulse Width Modulation 3 to 10Hz, 0 to 8 x Raven type flow control valve 1 to 5 s, 1 to 2.5 x Reaction time < 0.1 s RT500 RT200 RT200 and RT 500 Specifications

  19. Sensing and Treatment Scale and Strategy 30 ft by 60 ft RT500 RT200 High Resolution Sense and Treat Strategy Sensed Area Treated Area 2 ft by 2 ft Sense, Predict, and Treat Strategy

  20. Sensing and Treatment Scale

  21. Sensing and Treatment Scale GreenSeeker RT200 Equipped with Capstan PWM Sharpshooter

  22. 6 sensors on 60+ ft boom Can readily be mated with existing dry fertilizer and anhydrous ammonia applicators Fast installation with minimal modifications System intended for fertilizer and possibly and possibly products such as growth regulators and defoliants 30 sensor on 60 ft boom Existing dry fertilizer applicators cannot be used with this system System custom installed on each manufacturer’s sprayer /boom Can detect and spray weeds in fallow/no-till as well as apply fertilizer System can be used for other crops and materials RT500 RT200 RT200 and RT500 Specifications

  23. Ag Chem Variable Rate Granular Materials Applicator

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