Soil Mixer 2019/Controller
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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
20Nm Load on Motor
Check out these videos first.
| Series Circuit | Sequence Valve Circuit Closed Center Valve | Sequence Valve Circuit Open Center Valve |
|---|---|---|
| 13.25 GPM through valve. Motor speed up to 4K RPM on cyl retract. | This circuit behaves nicely methinks | Favorite so far. Please tell me what I'm missing. |
12/19/2019 (Getting Better Models)
| Series Circuit - 2500PSI Bypass Valve | Sequence Valve Circuit 1 Open Center Valve | Sequence Valve Circuit 2 Closed Center Valve |
|---|---|---|
| Motor gets no flow when cylinder bottoms out | 1000PSI Sequence Valve Setting | 1000PSI Sequence Valve Setting |
| Sequence Valve Circuit- Changing Variables | Sequence Valve Circuits with Loaded Motor | Series Circuit with Loaded Motor |
| In this video the sequence valve is set to ~500psi and I change parameters in the circuit including external torque on motor. | Sorry about the audio. Interesting results. The load on the motor may be low because the hammers pivot out of the way. I'm not sure how to go about calculating it but I could figure out the minimum diameter of the rotor (hammers pivoted) and start there. |
12/18/2019 (Lesser Quality Models)
Using demo version of FluidSIM
| Series Circuit with three way flow controller on motor | With flow (q) and pressure (p) during the simulation |
|---|---|
| Using a pressure relief valve in the simulator as a sequence valve. | Outlet from cylinder valve is plumbed through a check valve to motor. | ||
|---|---|---|---|
| high pressure remains at the pump outlet throughout simulation. something must be missing from the system or the valves aren't set right. | 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.