Cylinder Delaying
Cylinder Delaying
(OP)
Hello there!
I'm having a problem with two cylinders that are connected to the same valve. Throught the time, one cylinder starts to delay it course, and as they are attached to the same structure, this structure starts to break, causing problems to our process.
My question is: can I detect this delay in a hydraulic way (such as using a manometer), or trough an electrical sensor (such as an linear transducer attached to the cylinder)?
Thanks
Gustavo
I'm having a problem with two cylinders that are connected to the same valve. Throught the time, one cylinder starts to delay it course, and as they are attached to the same structure, this structure starts to break, causing problems to our process.
My question is: can I detect this delay in a hydraulic way (such as using a manometer), or trough an electrical sensor (such as an linear transducer attached to the cylinder)?
Thanks
Gustavo





RE: Cylinder Delaying
It is also possible, simpler, and usually cheaper, to link the cylinders with a sturdy mechanism.
Mike Halloran
Pembroke Pines, FL, USA
RE: Cylinder Delaying
The mechanism that you've said is using a metal bar that will connect the two cylinders toguether?
I was thinking in something like the picture attached. A linear transducer connected to cylinder's rod and to the body. This way, as the cylinder extend it's rod, the linear transducer will do it too.
Of course that this is just a concept, it will have to be worked.
RE: Cylinder Delaying
Aidan McAllister
Metallurgical Engineer
RE: Cylinder Delaying
RE: Cylinder Delaying
RE: Cylinder Delaying
OR, use a linkage, topographically similar to an anti-roll bar on a car, but with a _very_ stiff bar or tube transmitting torsion from one cylinder to the other.
Mike Halloran
Pembroke Pines, FL, USA
RE: Cylinder Delaying
RE: Cylinder Delaying
This is the system that I'm talking about. As you can see there are two cylinders that are connected by the transversal red bar.
That problem is when one of them extend faster than the other one. With that, the transversal bar wear up, until it crack or break.
Also with the image you can see that the cylinder do not accept the magnetostrictive linear sensor.
That picture helped?
Some more pictures.
RE: Cylinder Delaying
Mike Halloran
Pembroke Pines, FL, USA
RE: Cylinder Delaying
Researching I notice that there's no flux divider after the valve, so what I want is to install one to certify that the flux is equal to either cylinders.
But when it has an internal leakage caused by wear of the seal, they will still extend at different speed. For that what I want is to install two flux meters right after the tank connection. Thereby I can measure if there's an increase on the fluid returned to the reservoir. And I can electrically stop my machine preventively (like the image below).
RE: Cylinder Delaying
The differential movement can only due to differential external loads which are resisted by twisting of the cross bar, which looks substantial. Differential movement of the rods will be a symptom of external loads. Note that side loading on the rods is considered external to the pressure inside the cylinders.
The biggest concern I see is that the mechanism is too constrained, so if the rods aren't exactly parallel there is nothing that allows the cylinders to conform and this will apply a side load to the rods. This side load can bind and produce differential movement. I assume the machine is very well aligned, just a suggestion to others building similar devices.
RE: Cylinder Delaying
But when one of them have an internal leakege, that's when we have the cross bar twisted.
And when this happen, we have a big loss of production.
Isn't there any way to detect that they are moving in different speed?