Soil Mixer 2019/Controller: Difference between revisions

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*Needs to cycle a dc motor for cement dosing
*Needs to cycle a dc motor for cement dosing
*Water mister solenoid
*Water mister solenoid
=Electronics=
*Mega 2560
*Relay Shield (3A)
*External Relays boards for >3A
*Fused Battery Connection
*High Pressure Switch
*


=Hydraulics=
=Hydraulics=
==Hydraulic Calculations==
'''Hydraulic Cylinder Volumes.''' 2.5x12x1.25 Cylinder <br/>
Cap End Volume:((2.5in)/2)^2 * 3.14 * 12in =58.875 cu in <br/>
Rod Volume: ((1.25in)/2)^2 * 3.14 * 12in = 14.71875 cu in <br/>
Rod End Volume = 58.875 cu in - 14.71875 cu in =  44.15625‬ cu in
{|
|+style="font-size:150%"|Cylinder Travel Speeds
!Flow Rate
!Extend Time
!Retract Time
|-
!5 GPM
|3.06s
|2.29s
|-
!7.5 GPM
|2.04s
|1.53s
|-
!10 GPM
|1.53s
|1.15s
|-
!12.5 GPM
|1.22s
|0.92s
|-
!15GPM
|1.02s
|0.76s
|}
==Hydraulic Diagram==
==Hydraulic Diagram==
<html><iframe src="https://docs.google.com/presentation/d/1ScpptOBN8ljrSdcZd_iyKdNUiskhitRu5VUAuOlNQTg/embed?start=false&loop=false&delayms=3000#2" frameborder="0" width="960" height="749" allowfullscreen="true" mozallowfullscreen="true" webkitallowfullscreen="true"></iframe></html>
<html><iframe src="https://docs.google.com/presentation/d/1ScpptOBN8ljrSdcZd_iyKdNUiskhitRu5VUAuOlNQTg/embed?start=false&loop=false&delayms=3000#2" frameborder="0" width="960" height="749" allowfullscreen="true" mozallowfullscreen="true" webkitallowfullscreen="true"></iframe></html>
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==Hydraulic Circuit Simulation==
==Hydraulic Circuit Simulation==


===Series Circuit with three way flow controller on motor===
Simulated in Festo FluidSIM 30 minute demo
<html>
<video width="50%" height="50%" loop controls muted>
<source src="https://github.com/CabbageBreath/CabbageBreath.github.io/raw/master/Soil%20Mixer%202019/Series%20Circuit%201-1.webm" type="video/webm">
</video>
</html>
The next video shows flow (q) and pressure (p) during the simulation.
<html>
</video>
<video width="50%" height="50%" loop controls mute>
<source src="https://github.com/CabbageBreath/CabbageBreath.github.io/raw/master/Soil%20Mixer%202019/Series%20Circuit%202-1.webm" type="video/webm">
</video>
</html>
===Sequence Valve Circuit 1===
Using a pressure relief valve in the simulator as a sequence valve.
high pressure remains at the pump outlet throughout simulation. something must be missing from the system or the valves aren't set right.
<html>
</video>
<video width="50%" height="50%" loop controls mute>


===20Nm Load on Motor===
20nm load derived on mixer main page in design review section


<source src="https://github.com/CabbageBreath/CabbageBreath.github.io/raw/master/Soil%20Mixer%202019/Mixer%20Sequence%20Valve%20Circuit%201-1.webm" type="video/webm">
Download Circuit: [[File:SoilMixerFluidSIMCircuits.zip]]


Older simulations: [[/Hydraulic Simulation Archive]]


</video>
{|class="wikitable"
</html>
!Production-Ready Circuit
 
|-
===Sequence Valve Circuit 2===
|<html><video controls loop src="https://github.com/CabbageBreath/CabbageBreath.github.io/raw/master/Soil%20Mixer%202019/Series%20Circuit%2012-24-1.webm" height="100%" width="100%"></video></html>
Same as above but outlet from cylinder valve is plumbed through a check valve to motor. Increases motor flow during retraction of cylinder. Interesting effect- I didn't expect it.
|-
 
!Stepping Through This Circuit
This circuit isn't great because pump outlet pressure is constantly above 2700psi.
!Automated For Viewing Convenience
 
|-
<html>
|{{YoutubePopup|mH2onJqJIl8|big}}
</video>
|{{YoutubePopup|xVSR72DBsYI|big}}
<video width="50%" height="50%" loop controls mute>
|-
 
|Manually stepping through circuit with narration
 
|Automated, silent. Cylinder switched using pressure switch
<source src="https://github.com/CabbageBreath/CabbageBreath.github.io/raw/master/Soil%20Mixer%202019/Mixer%20Sequence%20Valve%20-%20check%20valve.webm">
|}
 
 
</video>
</html>
 
In both the above videos the setting of the two pressure relief valves changes motor speed and cylinder travel speed. I try to set it to minimize flow through main bypass valve.
 
=Electronics=

Latest revision as of 15:01, 28 December 2019

This page includes information about the entire electromechanical hydraulic control system for the soil mixer. This is a variant of CEB Press Controller v19.01


Controller Requirements

  • Needs to switch a double acting cylinder while running a hydraulic motor
  • Needs to cycle a dc motor for cement dosing
  • Water mister solenoid

Electronics

  • Mega 2560
  • Relay Shield (3A)
  • External Relays boards for >3A
  • Fused Battery Connection
  • High Pressure Switch

Hydraulics

Hydraulic Calculations

Hydraulic Cylinder Volumes. 2.5x12x1.25 Cylinder
Cap End Volume:((2.5in)/2)^2 * 3.14 * 12in =58.875 cu in
Rod Volume: ((1.25in)/2)^2 * 3.14 * 12in = 14.71875 cu in
Rod End Volume = 58.875 cu in - 14.71875 cu in = 44.15625‬ cu in

Cylinder Travel Speeds
Flow Rate Extend Time Retract Time
5 GPM 3.06s 2.29s
7.5 GPM 2.04s 1.53s
10 GPM 1.53s 1.15s
12.5 GPM 1.22s 0.92s
15GPM 1.02s 0.76s

Hydraulic Diagram


edit


Hydraulic Circuit Simulation

20Nm Load on Motor

20nm load derived on mixer main page in design review section

Download Circuit: File:SoilMixerFluidSIMCircuits.zip

Older simulations: /Hydraulic Simulation Archive

Production-Ready Circuit
Stepping Through This Circuit Automated For Viewing Convenience
http://img.youtube.com/vi/mH2onJqJIl8/0.jpg http://img.youtube.com/vi/xVSR72DBsYI/0.jpg
Manually stepping through circuit with narration Automated, silent. Cylinder switched using pressure switch
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