Soil Mixer 2019/Controller

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

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Hydraulic Circuit Simulation

Series Circuit with three way flow controller on motor

Simulated in Festo FluidSIM

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.

Sequence Valve Circuit 1

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.

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.