Single acting cylinder counter balance
Single acting cylinder counter balance
(OP)
Hello all Dave from NC here I am new to this forum,
I could use some advise on a solution for a problem I have with a machine. background... I have a die press machine that utilizes an electric motor and worm drive gear box that raises and lowers a die vertically, attached between the load and the motor mount is a single acting hydraulic cylinder that is designed to remove any backlash in the gearing drive train.
An operator switches the hydraulic valve off relieving the line pressure then positions the load via the electric motor, the operator then switches on the hydraulic valve and applies pressure to the hydraulic cylinder thus further lifting the load removing any backlash. This operation works, well almost.
The problem I have is at the point when the hydraulic pressure is removed the load drops slightly releasing the backlash. I need to be able to keep the back lash under control. My thought is to use the motor to drive the load down against some of the hydraulic pressure as opposed to just releasing all of the pressure in the cylinder.
I thought about a counter balance valve but since there is only one oil line to the cylinder there is no pilot pressure available. Then I thought about installing an adjustable regulator on the Tank port of the valve but I think this would create a very erratic movement.
So I am really not sure what the best solution would be in this situation. Any advice would be appreciated.
Best regards,
Dave T.
I could use some advise on a solution for a problem I have with a machine. background... I have a die press machine that utilizes an electric motor and worm drive gear box that raises and lowers a die vertically, attached between the load and the motor mount is a single acting hydraulic cylinder that is designed to remove any backlash in the gearing drive train.
An operator switches the hydraulic valve off relieving the line pressure then positions the load via the electric motor, the operator then switches on the hydraulic valve and applies pressure to the hydraulic cylinder thus further lifting the load removing any backlash. This operation works, well almost.
The problem I have is at the point when the hydraulic pressure is removed the load drops slightly releasing the backlash. I need to be able to keep the back lash under control. My thought is to use the motor to drive the load down against some of the hydraulic pressure as opposed to just releasing all of the pressure in the cylinder.
I thought about a counter balance valve but since there is only one oil line to the cylinder there is no pilot pressure available. Then I thought about installing an adjustable regulator on the Tank port of the valve but I think this would create a very erratic movement.
So I am really not sure what the best solution would be in this situation. Any advice would be appreciated.
Best regards,
Dave T.
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RE: Single acting cylinder counter balance
What did you think would happen?
What do you wish would happen, or not happen?
We would probably develop a better understanding of your problem, given some drawings, sketches, or photos of your apparatus and its operation. Remember we are not there to look over your shoulder; we only see what you show us.
Mike Halloran
Pembroke Pines, FL, USA
RE: Single acting cylinder counter balance
What did you think would happen? Exactly what does happen
What do you wish would happen, or not happen? maintain just enough pressure in the cylinder to allow the electric motor to move the load. I want to drive the load down.
RE: Single acting cylinder counter balance
What is supplying the hydraulic pressure anyway? Do you use a pump?
How do you 'remove' the hydraulic pressure? Do you simply divert the hose to tank?
Now we have established the mechanical aspect of the situation, we need the hydraulic side of the story. What valving etc is in place? Can you provide a hydraulic schematic for the hydraulic system?
Tom
RE: Single acting cylinder counter balance
How do you 'remove' the hydraulic pressure? Do you simply divert the hose to tank? electric solenoid valve controlled by the operator dumps to tank
Now we have established the mechanical aspect of the situation, we need the hydraulic side of the story. What valving etc is in place? Can you provide a hydraulic schematic for the hydraulic system? see picture
RE: Single acting cylinder counter balance
Ted
RE: Single acting cylinder counter balance
RE: Single acting cylinder counter balance
Ted
RE: Single acting cylinder counter balance
RE: Single acting cylinder counter balance
Ted
RE: Single acting cylinder counter balance
If you still want to release most of the hydraulic pressure to move the motor then consider adding a check valve installed "backwards" in the return line. There's a fixed pressure required to operate the check valve and that will maintain a residual pressure. I've seen check valves stacked in this manner to increase the residual pressure. Each check valve adds a pressure increment. My recollection is that each check takes about 100 PSI to open.
RE: Single acting cylinder counter balance