Post on 07-Apr-2018
8/6/2019 Cylinder Jun
1/15
8/6/2019 Cylinder Jun
2/15
Cylinders are linear actuators whichconvert fluid power into mechanicalpower. They are also known as JACKS or
RAMS. Once actuated, compressed air enters
into the tube at one end of the pistonand, hence, imparts force on the piston.
Consequently, the piston becomesdisplaced (moved) by the compressedair expanding in an attempt toreach atmospheric pressure.
8/6/2019 Cylinder Jun
3/15
The fluid pushes against the face of the pistonand produces a force.
F = pA
p is the pressure in N/m and A is the area thepressure acts on in m.
Let A be the full area of the piston and a be the
cross sectional area of the rod. If the pressure isacting on the rod side, then the area on which the
pressure acts is is (A - a).
F = pA on the full area of piston.
F = p(A-a) on the rod side.
8/6/2019 Cylinder Jun
4/15
The speed of the piston and rod
depends upon the flow rate of fluid. The
volume per second entering the cylindermust be the change in volume per
second inside. It follows then that:
Q m3/s = Area x distance moved per second
Q m3/s = A x velocity (full side)
Q m3/s = (A-a) x velocity (rod side)
8/6/2019 Cylinder Jun
5/15
Mechanical power is defined as Force x
velocity. This makes it easy to calculate
the power of a cylinder. The fluid powersupplied is more than the mechanical
power output because of friction
between the sliding parts.
8/6/2019 Cylinder Jun
6/15
Single acting cylinder It has power stroke in one direction only
A small air vent is require at the end of the cylinder to
prevent air locking A compression spring returns the piston to its original
position when the compressed is exhausted
Used for clamping, ejecting, lifting & feeding
8/6/2019 Cylinder Jun
7/15
8/6/2019 Cylinder Jun
8/15
Double acting cylinder
It has power stroke in both directions
No air vent is needed as pressure is require inboth extracting and retracting motion.
8/6/2019 Cylinder Jun
9/15
8/6/2019 Cylinder Jun
10/15
Through rod air cylinders
Piston rod extends through both sides of the
cylinder, allowing for equal forces andspeeds on either side.
8/6/2019 Cylinder Jun
11/15
Telescopic cylinder
These cylinders
produce long strokesfrom an initial shortlength. Each sectionslides inside a larger
section.
8/6/2019 Cylinder Jun
12/15
Cylinder cushioning
Th are double acting cylinder come with the
feature cushioning Pston will slow down toward the end of the
stroke in either direction of movement
8/6/2019 Cylinder Jun
13/15
Tandem cylinder Consist of 2 or more cylinders mounted inline
with pistons connected by common piston rod
Increased output force Small diameter
Shorter stroke
8/6/2019 Cylinder Jun
14/15
8/6/2019 Cylinder Jun
15/15