Cider Press Hydraulic Controls

   / Cider Press Hydraulic Controls #1  

r8f1k

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Let me first say that the press we are talking about is about 110-120 years old. It is a single acting cylinder vertically mounted, around 10" in diameter. It resides in a hole in the concrete and raises up to press the apples into cider, then gravity down to return. There is a 3/4 NPT port in the side of the cylinder and that is it. Right now, I have it controlled by a single spool and an old Vickers (Series V20, I THINK) vane pump. It has a 10 gallon supply tank, 3 phase motor, magnetic start/stop control and a mess of hoses.

Second, I recently bought a bin tipper/dumper that has a hydraulic control that is pressure up, gravity down. The controls for it are MUCH better than the hydraulic spool. There are only 2 hoses, the cylinder is a double acting; one comes from the pump, the other to the tank. The best part is that the controls are two buttons, UP and DOWN. Thats it. They are momentary, let go and the bin stops where you want. To raise the bin, press UP, stops when you let go of the button. To drop the bin, there is a solenoid that opens a (what I assume is) relief valve by pushing on a tab on the side of the pump. Release the DOWN button and it stops.

I want to do the same thing on this cider press. My pump doesn't have the same configuration to 'relief' the pump, but is there a way to add something like that? Does my cylinder need to be double acting to make this work?

Below are photos of my bin tipper prior to its overhaul. The Romex is long gone, the house hold switches are gone and replaced with contactors and Allen Bradley switches, but I think you get the idea of what the system is. One picture is a close up of the pump and solenoid. Is there a way to do that to my current pump?
 

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   / Cider Press Hydraulic Controls
  • Thread Starter
#2  
My Vickers pump is a V10-1P1P 1020
 
   / Cider Press Hydraulic Controls #3  
Do you want to raise and lower with a manual function or electrical function

the circuit you are describing is a basic lift, check, dump circuit the deciding factor on valves is type of operation mentioned above

if you are not a log of jogging while raising or closing the cider press you just use the start stop on the motor. With motor off lower.
 
   / Cider Press Hydraulic Controls
  • Thread Starter
#4  
I want to use electrical controls to aide in raising and lowering. I have Allen Bradley push buttons and I know how to wire up momentary contactors. I don't know how to LOWER the hydraulic cylinder without a spool. Can I use a solenoid? If so, what kind?
 
   / Cider Press Hydraulic Controls #5  
R8
Do you any estimate on what load pressure is when in gravity down mode. How fast do you want it to open? Since gravity down you have to size the components to pass required flow at low to very low pressure drop

you would be looking for a Normally Closed solenoid operated poppet valve that will close with low differential pressure
 
   / Cider Press Hydraulic Controls #6  
Why couldn't you put a normally closed, electric controlled hydraulic valve in the pressure line that is connected to tank. When you want to go up you push the up button on the hydraulic pump, let go and it stays there, to go down the new valve opens and drains the cylinder to tank when you push the down button.
Only other thing you may have to add is a check valve in the up circuit so the oil doesn't return thru the pump but there may be one there already............Mike
 
   / Cider Press Hydraulic Controls
  • Thread Starter
#7  
   / Cider Press Hydraulic Controls #8  
R8
Delta power company mizer blocks circuit option BA. They have a lift, check, dump circuit in one nice neat block. You would have to keep your existing relief valve.

Your pump produces 1 GPM at 1200 RPM or 1.5 GPM at 1800 RPM so do not need large valves on pump side. Lowering is still dependent on weight of press and load but suspect this size valve would provide adequate lowering speed.

 
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