Hydraulic delay circuit

[oldnslo]

Was planning on tractor hydraulics as the PTO will be used for the baler. So far it's still a picture in my head.

This may be a very silly question but... if you are using tractor hydraulics why can't you use the directional valve on the tractor to tilt and then return home? I suspect there are other functions involved or you are trying to automate this operation.

 

[Leejohn]

This may be a very silly question but... if you are using tractor hydraulics why can't you use the directional valve on the tractor to tilt and then return home? I suspect there are other functions involved or you are trying to automate this operation.

Agree it's not like that baler is putting out a bale a sec., there is time to do it with the remote hyd.

 

[RPW]

Yes, there are other functions. Also will be planning on a power beyond port connection. So here's the sequence. Bales enter the accumulator from the baler. 3 bales are lined up and at that time an arm will move the lined up bales onto the tilt table. Action is repeated 3 or 4 times (haven't decided). This action can be accomplished using a log splitter valve with auto cycle. As the last row of bales enter the tilt table it should trip a lever to tilt the table. As the last Bale leaves the table It should reset and the table Will be ready to accept more bales.

 

[Leejohn]

Is this like something you are wanting to make? At least do what they are doing?



Kuhns Mfg 1834 Hay Accumulator - YouTube
Baling alfalfa and accumulator dumping - May 27, 216 - YouTube

 

[RPW]

Second video is very close. I'm not looking to turn the bales on end but yes that is what I'm looking to do.
One thought I had was to use a log splitter valve but on the return circuit for the hydraulic cylinder use a restriction valve to reduce the flow so that it would take more time and allow all the bales to be deposited on the ground.

 

[SPYDERLK]

I have a project where I need to extend a cylinder and wait for a lever to trip the retraction of the cylinder. On another circuit I can use a log splitter valve with an automatic return but on this one I need to wait until an action takes place before I retract the cylinder. I was wondering if I held the same type of valve in the extend position until the action was completed would that work? This is for a tilt table and I need to wait until the material has cleared the table before tilting back to the original position.

Thanks in advance.

Could you make the pin hole for the rod end an oblong shape so the rod has to retract a bit before starting to pull the table back. ... Fool with table full extension point&balance and cylinder speed to get it right?

 

[Leejohn]

Well go here and download the owners manual it might give you some ideals. You might already have it.

Hoelscher Hay Systems

 

[RPW]

Thanks, I'll take a look at the manual. Spy- you have a very interesting solution. Hmmmmm

 

[oldnslo]

RPW,
What other features are you trying to incorporate when you say this may require a power beyond option?

 

[RPW]

Not a PB on the accumulator but on the tractor. Currently I have 1 set of remotes on the rear of the tractor and I really don't want to have to hold the remote while driving.

 

[RPW]

I think I've found my answer but..... Came across a valve commonly used in log splitters. Single spool, Holding the handle in the stroke position it will kick out at stroke end. On return the valve is place in the retract (detent) position and at the end would release to neutral position. So my thoughts are this on table full the lever would trip the valve to stroke position. Table would lift and at stroke extension valve would release. As the last bale left the table trip arm would return and trip the valve to retract. At table home position detent would trip the valve to neutral. Of course I've got the mechanics of valve to be released so as not to hold it in any one position. So far this is the closest I've come with everyone's help to solving this. Thoughts?
Thanks.

 

[SPYDERLK]

I think I've found my answer but..... Came across a valve commonly used in log splitters. Single spool, Holding the handle in the stroke position it will kick out at stroke end. On return the valve is place in the retract (detent) position and at the end would release to neutral position. So my thoughts are this on table full the lever would trip the valve to stroke position. Table would lift and at stroke extension valve would release. As the last bale left the table trip arm would return and trip the valve to retract. At table home position detent would trip the valve to neutral. Of course I've got the mechanics of valve to be released so as not to hold it in any one position. So far this is the closest I've come with everyone's help to solving this. Thoughts?
Thanks.

What would hold the valve lever to the extend position?

 

[oldnslo]

RPW,
do you have a link or brand name and model of the valve you found. From what your describing it sounds like it might work.

I believe a hydraulically released detented valve like those used on larger ag tractors would also work. You would need linkage to trip to the valve to extend and then also require linkage to trip the valve to retract and end of retract stroke the hydraulic released detent would shift the valve back to the center position waiting for the next cycle. You would have to be able to set the detent release pressure to assure that it is set lower than the tractor hydraulics.

Linkage would be the hard part and this would be a simple mechanical device.

 

[jenkinsph]

My concern would be timing of the motions. A log splitter valve or a standard detent and return to center valve may react quicker than is desired. If the table returns early it may flip the bales up disturbing the stacks. Not saying these methods wont work but you would have limited control of the timing of events. The sweet spot for proper operation may wind up being a very narrow range of travel speed.

Today electrical power including 120 vac, 24vac and 12vdc for operating controls is easy to set up self contained in a battery box. It does not take much power or capacity to operate a couple of electric solenoids all day. A small L+G battery or car battery would handle this easily. A $25 12vdc to 120vac inverter, small transformer for low voltage ac and the 12vdc from the battery should supply all the electrical needs for setting this up. Less than $100 for everything.

The photo cells and a relay could signal when the table is occupied and when it is empty and this would be independent of your travel speed. Other options such as table elevation with limits, push bars for aligning bales could also be included at a nominal cost. I would suggest using both mechanical and electrical controls which are optimal or best suited to get the results you need.

 

[RPW]

That could be an option. issue I have with solenoid valves is cost. Figuring in the valve, D03 plate, sensing (photo cell,etc.) costs go up pretty quickly. Again I'm not opposed to it I just have to justify everything. I've gone over the manuals on the commercial units and they are all mechanical. Thanks.

 

[RPW]

Originally I was thinking of using a DA cylinder for the tilt table. Would it be more practical to use a DA cylinder?