Interesting project.
Random thoughts.
Pumps
-Are these direct drive at 1000 rpm, or are they the PTO pumps with speed increaser gearbox bult in to increase speed? 1000 rpm pumps will be larger and not as efficient as turning at higher rpm, but you already have them.
-40 gpm is at 1000 rated as Mudd noted. Adjust calculations for rpm, and figure maybe 85-90% maximum efficiency on flow.
-If shaft drive pumps I would use U joints and drive shaft. Don’t use a pillow block as there will be side alignment issues. Those are only needed with side loads belt or chain drive.
-How will you drive second pump? Splined shaft through the hollow bores? Alignment will be critical on the second one.
VAlves 40 gpm
-Look at surpluscenter.com for pumps and valves.
-There are mobile valves of that size and larger, but don’t know about detents. Most will be pilot or electric operated, maybe a manual operator backup, but main control is remote.
There are ways to use a sequence valve in the pilot operated circuit but that is more complicated than I can explain here.
If electrical proportional control, you could use a limit switch in the return side to trip out the control of the valve.
If you used a bang/bang solenoid, two stage valve, the electric pilot stage could be controlled by limit switch. But 45 gpm puts you in the D06 size.
-45 gpm in a solenoid cartridge valve is easily doable. You will need the other speed and pressure controls separately. Look at Sun Hydraulics, HydraForce, Eaton/Modular Controls
-The saw circuits will need a relief valve for acceleration control, and preferably a braking/anti caviation valve to slow it down smoothly and prevent motor cav on the driving side. Without some sort of braking it will spin a long time. Brake valve also adds emergency stop safety function.
Small circuits
-These are a problem.
-It is easy to take small flow say 1 to 5 gpm off tyhe 40, to run conveyor and cylinders, with flow dividers, priority or proportional. You would need a gear divider though, not a spool divider. Gear divider transfers energy from the small, unloaded flow over to the main flow. Spool divider throttles pressure on the small side, when it is not used, and converts it to heat.
-Both of those dividers rob flow from the main circuit, which slows the splitter cylinder. Basically, you are paying for energy and flow but not using it to do the splitting.
-You could take the divided flow out, run into a smaller power beyond spool valve for conveyor and cylinders, when the cylinders are not being used, the ‘robbed’ flow from divider can go back via power beyond into the main flow and go on to the splitter.
-Small circuit will be a heater, as it throttles energy. Cylinder, no big deal, as they are probably very intermittent use. The conveyor motor is a bigger deal, as to get (pick numbers) say 5 gpm at 1000 psi, the circuit will throttle all the unused energy continuously into heat. Not just of the 5 gpm but the other side of the circuit also. If not splitting, the other side of 35 gpm at 1000 psi will be converted to heat.
-I would add a third pump, however you do it, sized to run the conveyor. 5 gpm? Guessing. Then use a small power beyond spool valve with motor spool for conveyor, several cylinder spools for the various cylinders. Run the conveyor as needed, with minimal heat in this circuit. Get your conveyor maximum speed determined with sprocket sizes and try to avoid throttling the oil flow. Flow controls convert energy to heat. Again, intermittent cylinder loads don’t produce much total heat but continuously running motors create heat all that time.
Then take the power beyond outlet flow back into the main splitter cylinder circuit. I assume the conveyor would usually be running, so the PB won’t gain much then, But if coneyor is intermittent, the PB flow would speed up the splitter cylinder whenever the conveyor is not running.
-This may not be popular, but I would look at a three section pump (or dual front section with rear pad, then a smaller third pump on the rear pad), run them right off the engine, with or without the clutch. Sell off the PTO pumps. Pumps would be smaller and more efficient and run them about 180” rpm. I think that may be cheaper and easier then the mechanical issues with the 1000 rpm pumps.
- yes you will need a governor. Maybe an electronic aftermarket cruise control could be adapted to that I’m not sure. I know surpluscenter used to sell an external mechanical governor taken off off something that could be bolted to a bracket and run of the v belt for the alternator. Some linkage rigged up to the carburetor assuming it’s carbureted engine. that product was for sale quite a while ago so they may not have it anymore.
I’ll think some more this weekend when I will be driving 4 hours each way. Keeps me awake !
Kcj
