Pneumatic logic circuit
Pneumatic logic circuit
(OP)
Hi, I have a pneumatic logic question. I have an application where I need to have valve X pass air unless one of two limit valves is made. My issue is whatever I come up with dumps line pressure thru the exhaust of 1 limit when the other is made. Thought about a shuttle valve but this will lock up because it can't exhaust.
The application is a stroker with a cutting head. Want the head to turn on when it comes off the LS and stay on until it reaches the LS at the other end then turn off again.
Any suggestions appreciated, air logic isn't something I use very often.
The application is a stroker with a cutting head. Want the head to turn on when it comes off the LS and stay on until it reaches the LS at the other end then turn off again.
Any suggestions appreciated, air logic isn't something I use very often.





RE: Pneumatic logic circuit
What I think you are asking for is a common circuit for a Cylinder and could be used for a Motor.
What is necessary is a description of the cycle progression you want in a manner anyone can follow.
I have heard, in my younger days, of stroker engines but I'm pretty sure that is not what you are looking for.
What causes the "head," whatever that is, to "turn on when it comes off the limit switch?" What input causes it to "Come off the Limit switch?" Is the motion continuous? If so what auses it to stop?
The more specifics you provide the better the chance of getting workable feedback. A sketch would help also.
Bud Trinkel, Fluid Power Consultant
HYDRA-PNEU CONSULTING
RE: Pneumatic logic circuit
This is a manual operation that is only used at a production start-up, so fairly infrequent use.
RE: Pneumatic logic circuit
To my way of thinking that is a complete operation and the Limit Switches serve no purpose except the one at Home Position could assure rhe Cutting Head is not in the way of the next part of the machines operation.
"The valve controlling the cutting head will be on unless one of the end switches is made."
Your writeup indicates Valve Controlling the Cutting Head is Maually Operated and does not need any electrics.
As you have probably guessed by now I'm totally confused and have no idea how your circuit functions/opearates and how it might be controlled.
This circuit sounds like one from a teacher in a Pneumatics class who wants you to ask questions like you will be required to do when dealing with most of the people you will be working with/for after you complete your Pneumatics course.
A Pneumatic Logic Circut would have no Limit Switches since they would be repalced by Limit Valves that would give Pilot Pressure to Air Pilot Operated Valves to shift them to do the function called out.
You can see some Air Logic circuits and Air Logic components in a training book I wrote here:
http://www.hydraulicspneumatics.com/200/eBooks/
Look in the Basic Book at Chapter 19 to see Air Logic Control components and some circuit examples of them. Also the Circuits book as several Air Logic Circuits in the "Air Logic" section.
Bud Trinkel, Fluid Power Consultant
HYDRA-PNEU CONSULTING
RE: Pneumatic logic circuit
-- MechEng2005
RE: Pneumatic logic circuit
The limit valves at each end are to turn off air to the valve operating the cutter. Basically if it is not parked at either end I need the cutter to be on.
I need to have all pneumatic, no electrical switches etc.
RE: Pneumatic logic circuit
RE: Pneumatic logic circuit
Ted
RE: Pneumatic logic circuit
There is no "Cutter"
There si a RAISE/LOWER which you've never mentioned before.
TRAVERSE appears to be a Rodless Cylinder that reciprocates and has Limit Valves at both ends to shut off the WATER JET VALVE.
There is a now an Air Motor marked RAISE/LOWER as another operation.
Can you write a Sequence of Events such as:
Start Signal
Air Motor On, Raise
Traverse Move Left
Traverse Move Right
Air Motor On Lower
Air Motor Off
If the Traverse continuously reciprocates indicate it does that until a Stop Signal.
The more information supplied the greater the possibility of a logical answer.
Bud Trinkel, Fluid Power Consultant
HYDRA-PNEU CONSULTING
RE: Pneumatic logic circuit
Limit valves in series. Both must be in normally open position to supply air to the head. When either one is acutated it dumps the air from the head and blocks the input air.
Ted
RE: Pneumatic logic circuit
Mark Hutton
RE: Pneumatic logic circuit
Thanks again.