would like to power a conveyor from my log splitter. Can I tie into the log splitter circuit to power a hydraulic motor? The splitter valve is an open circuit, spring return. Can I plumb the motor using the open circuit return line? Will this method still be protected by the pressure relief valve?
2nd function on a log splitter
- Thread starter jezorek
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AKKAMAAN
Veteran Member
Do you want conveyor to run continuously?
You could use the logs plitter pump, but would need a second control valve, plumbed power beyond
see above
NO, not if pressure relief valve wont have a free return straight to tank (via filter ok)
If you want conveyor to run continuously with out being interrupted by log splitter, you need it on its own pump circuit...
You must not plumb it in series with the log splitter cylinder on the return line!!
AKKAMAAN
Veteran Member
Do you want splitter to wait for the conveyor?
Or the only other option is to use a flow diverter after the pump, but that will permanently cut you splitter capacity (flow=cycle time).......so that is still "splitter waiting for conveyor" ....
Flow diverter is definitely NOT a good idea if you are using a two stage pump....
Back to square one....either operate splitter and conveyor separately (power beyond connected 2nd conveyor valve), or use separate pump for conveyor circuit...
DAY
Platinum Member
In Ancient Times a farmer would jack up the back end of his Poppin' Johnny, and run a wide belt around the tire, to power a buzz saw. Dangerous as ****, but that was in the days before the chain saw.
I had a pulley that ran off the PTO, and used a belt to power a hammer mill, back in the 70's. Tractors used to be a stationary power source for a lot of tools, in the Days of Yore.
I had a pulley that ran off the PTO, and used a belt to power a hammer mill, back in the 70's. Tractors used to be a stationary power source for a lot of tools, in the Days of Yore.
J_J
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Are you using tractor hydraulics or an small engine and a 2 stage pump? If using tractor hydraulics, you could use a divider valve for continuous operation of a hyd motor. The divider valve would split the hyd flow into something like 3 GPM in one circuit [ conveyor ] and 7 GPM into another circuit , [ log splitter ].
J_J
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I am not so sure that a basic log splitter valve will handle a high back pressure. Sure, you could install another valve in series with the log splitter valve, but when the log splitter is working, what kind of pressure will the other valve have . If the other valve is powering the conveyor, then it receives the expended fluid from the hyd cyl. You need to split the flow before the log splitter valve.
If you connect the valve with PB, then the next/other valve running the conveyor will quit, because all the fluid the log splitter is using is now going out the tank port.
If you connect the valve with PB, then the next/other valve running the conveyor will quit, because all the fluid the log splitter is using is now going out the tank port.
I did some experimenting today and came up with a satisfactory setup. I piped the open center return of the log splitter valve to a flow contol valve equipped with a pressure relief bypass. The excess flow line of the flow control valve tees into the outlet of the conveyor motor and they discharge into the filter/resivoir.
When the splitter is not splitting, the conveyor runs. It stops when the splitter valve is actuated. This is all I need since I can't split and load the conveyoy at the same time.
When the splitter is not splitting, the conveyor runs. It stops when the splitter valve is actuated. This is all I need since I can't split and load the conveyoy at the same time.
AKKAMAAN
Veteran Member
good....
If conveyor motor induce higher pressure than 400-600psi, you definitely risk to blow the low pressure spool seals (o-rings) on the splitter valve. If pressure increases to higher levels, you even risk to crack the valve housing on the splitter valve...These problems can be prevented with a splitter valve that have a power beyond optional return outlet.
Akkamaan,
Thanks for your replys. I'm not sure I understand why the seals would blow on the splitter valve. Why wouldn't they blow when the second stage kicks in during splitting? I am not challenging your assertion- I just don't understand.
I will put a gauge on the output side of the splitter valve to see what pressures develope. If necessary, I will change the splitter valve. Can you name a brand and model of the valve you describe?
Do you see any problem with teeing the excess flow line and motor return line together?
Thanks in advance
J_J
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Back pressure.
Max tank port pressure is only 150 psi.
Most common log splitter valves were designed for a specific task. and the output outlet was not designed to handle high pressure. It was designed to pass fluid through the valve in the neutral position, and expend the fluid from the cyl, none of that high pressure.
If you hooked the log splitter valve in a series circuit with a hyd motor valve valve, and if the hyd motor stalled, the high pressure would be reflected back to the spool seals and outlet port, and perhaps blow and or crack the housing. If the conveyor hyd motor is only doing light duty, the high pressure may never happen.
The only log splitter valve I have seen with PB is the dual lever auto valve, made by Prince.
Look at Specifications.
http://www.princehyd.com/Portals/0/products/valves/catalog/ValvesLsRd25.pdf
Max tank port pressure is only 150 psi.
Most common log splitter valves were designed for a specific task. and the output outlet was not designed to handle high pressure. It was designed to pass fluid through the valve in the neutral position, and expend the fluid from the cyl, none of that high pressure.
If you hooked the log splitter valve in a series circuit with a hyd motor valve valve, and if the hyd motor stalled, the high pressure would be reflected back to the spool seals and outlet port, and perhaps blow and or crack the housing. If the conveyor hyd motor is only doing light duty, the high pressure may never happen.
The only log splitter valve I have seen with PB is the dual lever auto valve, made by Prince.
Look at Specifications.
http://www.princehyd.com/Portals/0/products/valves/catalog/ValvesLsRd25.pdf
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AKKAMAAN
Veteran Member
The return gallery in the splitter valve get pressurized with your plumbing, pressure from down stream motor valve....the seals are there to prevent the low return pressure to leak out externally...not designed to hold more than 300-500psi or so...
You can get some simultaneous operation with the 2 spool valve J_J mentioned...then no PB required...
I also think I have seen 1-spool valves that are PB capable....I will look around to see if I can find it....recall it was little spendy though...
JJ and Akkamaan
Thanks for the explaination. Now I get it! I'll look for a more suitable splitter valve. If you have a specific recommendation let me know. In the meantime I'll get a gauge in the down stream side and see if what kind of pressure I see when the converoy is under load. May take a day or two.
Would you mind throwing in a few details on your conveyor setup? This is something i've been wanting to do for a while.
jcims- The conveyor I want to use was originally a piece of farm equipment.It is bent up from thin gauge aluminum and uses detachable chain with rubber paddles attached to the links every foot or so. Total length is 16 ft. What other details would you like?
Cool..thanks for the info! Is it a grain conveyor style like this?
Did you have to swap in a hyd motor or was it already equipped that way?
I'm also curious about the structural support...seems that firewood is probably lighter than would be needed for lifting bales if it's a hay elevator, but possibly heavier (and harder) than grain.
DAY
Platinum Member
My haybale elevator is powered by a 110 volt, 1/2 hp motor, and can lift 2-3 50 lb bales at a time 20 feet without effort. Old motors a dime a dozen; since you already have the conveyor, why not go electric? (of course if you are splitting out in the woods, that's a different story!)
AKKAMAAN
Veteran Member
great idea...:thumbsup:
