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
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
| 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 Circuit Simulation
20Nm Load on Motor
Check out these videos first. 20nm load derived on mixer main page in design review section
| 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. When cylinder bottoms out, fluid has no path to tank and flow stops through the system. | Whereas the third circuit has difficulty retracting the cylinder under heavy motor loads, this circuit has no such condition. Flow rate through motor significantly decreased when cylinder is traveling as all cylinder flow is lost to tank. | If the motor is loaded more than 20Nm(maybe 40Nm, the cylinder cannot retract. I'm not entirely sure why this is yet. If the motor is loaded at 20Nm then the circuit behaves well and all flow from cylinder goes to motor during cylinder travel. |