single-acting pneumatic cylinder

[Davimont]

Have a good night.
I have a circular plane that rotates in a way scattered on bearing spheres and maintains its position on its axis thanks to two tubulars that rotate one within the other, I schematized the components in the image.
the table must be blocked by one or two pneumatic cylinders while the operator works and must be able to unlock the rotation to the need.

cylinders will be equipped with a buffer on the stem that presses on the green tube.

I had chosen a 27 series camozzi cylinder from ø40 double effect but the customer asks me if it is possible to have a cylinder that presses and blocks the table we say passively.
even in the absence of air, the cylinder should press on the board thanks to a spring, while the air should only serve for release and therefore to bring the stem back.
the race must be minimal, just to lock and release the tubular.

Is there anything like that?

 

[cacciatorino]

Have a good night.
I have a circular plane that rotates in a way scattered on bearing spheres and maintains its position on its axis thanks to two tubulars that rotate one within the other, I schematized the components in the image.
View attachment 71254the table must be blocked by one or two pneumatic cylinders while the operator works and must be able to unlock the rotation to the need.

cylinders will be equipped with a buffer on the stem that presses on the green tube.

I had chosen a 27 series camozzi cylinder from ø40 double effect but the customer asks me if it is possible to have a cylinder that presses and blocks the table we say passively.
even in the absence of air, the cylinder should press on the board thanks to a spring, while the air should only serve for release and therefore to bring the stem back.
the race must be minimal, just to lock and release the tubular.

Is there anything like that?

of cylinders with simple effect there are many. Are you bound for any reason to the 27 series that does not exist double effect?

 

[Dum]

not knowing what kind of activity the operator has to do on the table, I can not know if it is excessive as a solution, but I, to keep me on the side of the reason, would opt for a stopper cylinder; are cylinders that can also bear radial loads.
Perhaps the operator in carrying out his duties risks turning the table and a normal cylinder at the long time could suffer the having to endure radial loads.
I don't know if I could explain. :

in case, the smc (and I think almost all other cylinder suppliers simply had the smc card opened in the browser) have the series of stopper cylinders to simple effect.

Compra online RS(D)Q-Z, cilindro stopper, altezza di montaggio fissa | SMC Italia

Scopre sul nostro sito RS(D)Q-Z, cilindro stopper, altezza di montaggio fissa di SMC. Spedizioni rapide e sicure. SMC, sempre al tuo fianco.

www.smc.eu

 

[Davimont]

no special bond.
as a base of departure they gave me a 40mm aleage but it was reasoned on the thrust of the air on it. Now instead it has gone to a spring push.
cylinders with simple effect I have seen, but I know only those where the spring works on the back of the stem and not in extension, moreover the spring should have a force comparable to the push of a classic cylinder and when it is activated, the air should win the force of the spring.

I never take a tire so it's all new to me.
@dum thanks for the link, say too much why expensive?
My doubt always remains the force taken only with the spring, I do not know if there is such a solution.

 

[DrBarde]

Did you figure out how much strength you need? from there you can start with a minimum of sizing.

 

[Marco F inox]

if the rotation of the disk, even angle, is at the discretion of the operator, I would choose
a mechanical plant.
if air is lacking in pressure, the plane no longer turns and the operator must act in both cases,
on a lever.

 

[Davimont]

Did you figure out how much strength you need? from there you can start with a minimum of sizing.

no calculation, here we go to the eye:
is not a heavy application so it can go well any mneumatic cylinder (actually they are 2 opposites but I did not specify it)
we have hypothesized a 40-year-old alesaggio just because spannometrically it could go well.

if the rotation of the disk, even angle, is at the discretion of the operator, I would choose
a mechanical plant.
if air is lacking in pressure, the plane no longer turns and the operator must act in both cases,
on a lever.

you are fully right and at first we also rated this option.
the ideal would be a pin on the outer circumference of the plan but we have no space except important changes.
a pin on the tubular tree we excluded it for two reasons:

• the pin must have a minimum of play to fit into its hole on the shaft and this would translate into a little stable and annoying locking for the operator.
• if the operator force the rotation, the moment you come to create at the axis could twist the pin inserted in place with its consequences.

a swab that presses on the central shaft allows the locking of the table in any position and in case of forced slip without damage. we say that the stem is not very happy with all that lateral moment but for now we have come to these considerations.

 

[Marco F inox]

an eccentric horizontal axis cylinder with brass pad, commanded by a lever to it solidarity, should solve all your doubts.

 

[Dum]

no calculation, here we go to the eye:
is not a heavy application so it can go well any mneumatic cylinder (actually they are 2 opposites but I did not specify it)
we have hypothesized a 40-year-old alesaggio just because spannometrically it could go well.

you are fully right and at first we also rated this option.
the ideal would be a pin on the outer circumference of the plan but we have no space except important changes.
a pin on the tubular tree we excluded it for two reasons:

• the pin must have a minimum of play to fit into its hole on the shaft and this would translate into a little stable and annoying locking for the operator.
• if the operator force the rotation, the moment you come to create at the axis could twist the pin inserted in place with its consequences.

a swab that presses on the central shaft allows the locking of the table in any position and in case of forced slip without damage. we say that the stem is not very happy with all that lateral moment but for now we have come to these considerations.

If the positions of the table are certain instead of putting the cylinder working on the tree you can put it that you work on the table.
always those stopper cylinders I was talking about, but instead of working on the tree they work on the table. .
usually do so
as from wonderful and technical diagram attached.a speech that goes to die in case there is no certain position.

 

[Davimont]

the position is random according to the manufacture and processing to be carried out on it.
the stopper pistons however I did not know them and therefore I will take them into consideration.

 

[meccanicamg]

no special bond.
as a base of departure they gave me a 40mm aleage but it was reasoned on the thrust of the air on it. Now instead it has gone to a spring push.
cylinders with simple effect I have seen, but I know only those where the spring works on the back of the stem and not in extension, moreover the spring should have a force comparable to the push of a classic cylinder and when it is activated, the air should win the force of the spring.

I never take a tire so it's all new to me.
@dum thanks for the link, say too much why expensive?
My doubt always remains the force taken only with the spring, I do not know if there is such a solution.

different manufacturers make spring cylinders pushed....just look at the catalogs.