Transcript Rendel Farms Ramp Sprayer - Oklahoma State University

Rendel Farms Ramp Sprayer
(or “How a Navy Nuclear engineer applies the K.I.S.S. principle”)
Designed and built by Brent Rendel
The Sprayer
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7 tip sets on 20” center
4 solenoid control valves
50 gallon poly tank
PTO-driven roller pump
1” supply line
½” spray line
Spray Tips
• Hypro Fastcap 6-Jet
Liquid Fertilizer tips
• 1x Tips - 0.015
• 2x Tips – 0.03
• 4x Tips – 0.06
• 8x Tips – 0.15 (see later
notes regarding this tip
size)
Valve Bank
• 4 TeeJet 144A 3-way Directo
Valves
• Throttle valves allow
adjustment of “off” bypass flow
to minimize system pressure
changes as various valves cycle
• Pressure Regulator at bank exit
proved to be unnecessary.
System pressure controlled by
throttle valves
Operating Station
• Analog Control
• 12VDC system
Control Panel
• Master Switch controls system
power
• 3-position rate switches control
each solenoid valve
– Off: always off
– On: always on; used during
calibration, cleanout, etc.
– Auto: Valves controlled by
Switch #1 and Switch #2
• Pilot lights indicate when power
is applied to respective circuits
Ramp Control Operation
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Shown in Ramp Position 13 (1x, 4x, and
8x solenoids powered)
Ramp is applied by:
– Begin traveling at 3 MPH, Switch #1 at
“0” position, Switch #2 at “6”position,
Solenoid Switches in “Auto”, Master
Switch “On”
– Rotate Switch #1 at regular intervals
until “Switch #2” position is reached
– Rotate Switch #2 at regular intervals
until “Off” is reached
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Best method was simply counting to 3
between positions; traveled about 13
feet during each step
“Simple” Analog Guts
• 4-pole, 11-position rotary
switch for Switch #1
• 2-pole, 11-position rotary
switch for Switch #2
• Fuse protection for master
power and each spray
solenoid
Sprayer Calibration Spreadsheet
28% UAN GreenSeeker N-Ramp Rate/Speed Calculator
•Developed an Excel spreadsheet to
assist in calculating all the various
parameters to lay down the ramp
Tips
5
Tip Spacing
20 inches
Effective Boom width
8.333 feet
Target Ramp Increments
13 feet
Acre/increment 0.002487 ac
Target incremental N rate
13 # N/ac
Number of increments
16
28% UAN incremental rate
4.359 gal/ac
Known Step Increment Time
OR Known Travel Speed
seconds
3 MPH
Target Step Increment Time
Target Travel Speed
2.95 seconds
3.00 MPH
28% UAN Incremental (1X) Application rate
Boom #1 (1X) application rate
Boom #2 (2X) application rate
Boom #3 (4X) application rate
Boom #4 (8X) application rate
Dilute 10 gal of 28% UAN to make
Diluted UAN Incremental (1X) Application rate
Boom #1 (1X) application rate
Boom #2 (2X) application rate
Boom #3 (4X) application rate
Boom #4 (8X) application rate
Step 15 (1 /
Step 14 (X /
Step 13 (1 /
Step 12 (X /
Step 11 (1 /
Step 10 (X /
Step 9 (1 /
Step 8 (X /
Step 7 (1 /
Step 6 (X /
Step 5 (1 /
Step 4 (X /
Step 3 (1 /
Step 2 (X /
Step 1 (1 /
Step 0 (X /
End Zone (1 /
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Total Solution per Ramp
0.220
0.044
0.088
0.176
0.352
•Also provides flow information for
sprayer calibration
gal/min
gal/min per tip
gal/min per tip
gal/min per tip
gal/min per tip
30 gal of spray solution
0.661
0.132
0.264
0.528
1.057
13.871
12.946
12.022
11.097
10.172
9.247
8.323
7.398
6.473
5.548
4.624
3.699
2.774
1.849
0.925
0.000
13.871
gal/min
gal/min per tip
gal/min per tip
gal/min per tip
gal/min per tip
gal/min
gal/min
gal/min
gal/min
gal/min
gal/min
gal/min
gal/min
gal/min
gal/min
gal/min
gal/min
gal/min
gal/min
gal/min
gal/min
gal/min
6.15 gal
Calibration Data
16.91 fl.oz/min/tip
33.82 fl.oz/min/tip
67.64 fl.oz/min/tip
135.28 fl.oz/min/tip
•Spreadsheet also contains list of most
major components purchased to build
sprayer
•To open file, right click on
spreadsheet image and select
“Worksheet object”  “Open”
Notes
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I used ½” spray line from valves to booms, but I could not generate sufficient flow to
end tips on 8x boom. I blanked off all end tips for corn ramps (5 tip sets vice 7). I am
going to try upping the 8X hose to ¾” out of valve and teeing it off to two ½” lines to
feed those tips. If this still isn’t enough, I will probably convert boom to only 5 tip sets
either keeping 20” spacing or spreading out to 30” spacing for wider coverage. 20” x 5
tips provided very good application for 3 rows on corn.
Switch #2 is only a 2-pole switch, so final “high rate” ramp marker could only use 2
solenoids. Using 8x and 4x solenoids provided a 12x rate which should be fine as a
visual marker.
I originally had a 5th throttle valve installed on the outlet of the 8x valve to compensate
for using 0.15 tips. Due to ½” line flow restriction, I had to remove that valve
completely and still barely reached 8x flow from those tips. I think upping the hose size
will necessitate adding this throttle valve back.
It’s a little tricky to balance the by-pass flow throttle valves, but when done properly, I
could maintain desired pressure (40 psig) consistently across all 15 spraying steps.
Additional Pictures