How air rams work

Master Mac
Sep 4, 2018 · 2 min read

There are different uses of this pneumatic cylinder in industrial works as part of the mechanical devices which use the power of compressed gas to produce a force in linear motion. Like a piston of the motor engine to move in the desired direction. There is a type of pneumatic cylinders that differs in appearance, function, and size. How does it work?

Air rams works into two procedures Instroke and outstroke

The compressibility of a gas is the main significant issue working with pneumatic cylinders. It compress air contain in cylinder that make the piston move. The piston diameter and the force exerted by a cylinder are related, not directly proportional to one another. The two assumes that the air supply does not become saturated. The instroke force is less than the outstroke force.

Hibbeler, R.C. (2007). Engineering Mechanics: Statics (11 ed.). New Jersey: Pearson Prentice Hall. ISBN 0–13–221500–4.

“ From this simple distribution of load equation related between the radius, force, and pressure.

Let Fr = PAe

Where:

Fr: is the resultant force

P: is the pressure or distributed load on the surface

Ae: is the effective cross-sectional area where the load is acting on

Air rams Outstroke

Using the distributed load equation provided that can be replaced with the area of the piston surface where the pressure is acting on.

Where:

Fr — represents the resultant force

r — represents the radius of the piston

pi, approximately equal to 3.14159.

Air rams Instroke

On instroke, the force exerted are the same, pressure and effective cross section part applies as discussed above outstroke. The relation between force, radius and pressure are different because the cross-sectional side is less than the piston part.

The relationship for instroke between the force exerted, pressure, the radius of the piston rod, and radius of the piston, and, is as follows:

Let:

Fr= P(P(pi r 2/1-pi r 2/2)=P pi (r 2/1-r 2/2)

Where:

Fr — represents the resultant force

r1 — represents the radius of the piston

r2 — represents the radius of the piston rod

pi, approximately equal to 3.14159.”