Soil Mixer 2019/Controller: Difference between revisions
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===Sequence Valve Circuit 1=== | ===Sequence Valve Circuit 1=== | ||
Using a pressure relief valve in the simulator as a sequence valve. | 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> | <html> | ||
Revision as of 23:51, 18 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
Hydraulics
Hydraulic Diagram
Hydraulic Circuit Simulation
Series Circuit with three way flow controller on motor
Simulated in Festo FluidSIM 30 minute demo
The next video shows flow (q) and pressure (p) during the simulation.
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.
Sequence Valve Circuit 2
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.
This circuit isn't great because pump outlet pressure is constantly above 2700psi.
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.