3.1 CYLINDER
Double acting
air cylinders are always of piston type and are equipped with two inlets one on
either side of the piston. Double action cylinders are capable of performing
motions in both directions.
CYLINDER THRUST
The thrust (or) piston developed in the
cylinder, is a function of the piston diameter, the operating air pressure are
the frictions resistance. The thrust is measured in the static state and the
frictional resistance corresponds to the breakaway moment of the piston. And in
the static state, the frictional resistance is zero. Cylinder's thrust can be
calculated by using the following formula.
Thrust = piston area multiplied by air
pressure.
F = A * Pg.
FOR DOUBLE ACTION CYLINDER
Extending
Stroke F = D2 * (3.14 / 4) * Pg.
Retracting Stroke F =
( D2 - d2 ) * (3.14 / 4 ) * Pg.
D - Piston Diameter ( cm ).
d - Piston Rod Diameter ( cm ).
A - Piston area ( cm2 ).
F - Thrust or Piston power ( Kgf ).
Pg - Operating air pressure gauge ( bars ).
AIR CONSUMPTION
The compressed air supplied to a pneumatic cylinder is consumed by
the cylinder. The amount of air consumed is the energy, which is being converted
into stroke in the cylinder. The consumed air is exhausted out to the
atmosphere. Air consumption at a given operating pressure, given piston diameter
and a given piston stroke is calculated as
Compression ratio piston area stroke
The compression ratio = 1.033 + operating pressure in bar/1.033.
FOR DOUBLE ACTING CYLINDER
Air consumption Q = 2 * ( s * n * q ) in 1/min.
Q - air consumption in 1/min.
q - air consumption per cm of piston stroke.
s - piston stroke in cm
n - number of operating cycles per minute.
The air consumption
of the cylinder is stated in volume per minute. It is essential to know the
number of operating cycles per unit of time.
One operating cycle
is the movement performed by an activator from it's original position.
On a pneumatic
cylinder one cycle is equal to two piston stroke ( forward stroke and return
stroke ).
Bore dia ( mm )
|
12
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Rod dia ( mm )
|
6
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Stroke
|
25 / 100 / ( mm ).
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Medium
|
Compressed - Pressured - Lubricated Air
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Temperature
|
5 - 60 Celsius.
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Materials of construction
|
Aluminum, Brass, Nit rile.
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Mountings
|
Double foot Mouting.
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Pressure
|
0.5 - 10 bar.
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WORKING PRESSURE IN BAR
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Bore Dia ( mm )
|
Rod Dia ( mm )
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
|
12
|
6
|
Extract
|
20
|
30
|
50
|
60
|
70
|
80
|
90
|
100
|
|
Retract
|
15
|
22
|
30
|
38
|
46
|
53
|
61
|
68
|
76
|
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| DOUBLE ACTING CYLINDER |
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| DOUBLE ACTING CYLINDER |
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