JJ512 CHAPTER 2 Elements in Pneumatics

CHAPTER 2 ELEMENTS IN PNEUMATIC WORKING SYSTEM

ACTUATOR

Single acting cylinder Double acting cylinder Twin rod Lead rod Multi-position rod Locked rod rotated actuator Rod without cylinder Slide unit Hollowed rod cylinder Air chuck (grasping)

SINGLE ACTING CYLINDER

DOUBLE ACTING CYLINDER

CYLINDER SIZE

Linear cylinders have the following standard diameters as recommended in ISO: 8, 10,12,16,20,25,32,40,50,63,80,100,125,140,160,200,250,320mm

DETERMINE CYLINDER SIZE

Force (N) = Piston area (m 2) X air pressure (N /m2) Or Force (lbf) = Piston area (in2) X air pressure (lbf/in2)

 D 2   Pg Fe    4 

DOUBLE ACTING CYLINDER 𝜋 4

Extending stroke: F E = 𝑥𝐷 2 𝑥𝜌𝑔 D = piston diameter, g = working pressure 𝜋 4

Retracting stroke: F R = 𝑥 𝐷 2 − 𝑑 2 𝑥𝜌𝑔 D = piston diameter, d = rod diameter, g = working pressure

SINGLE ACTING CYLINDER 𝜋 4

Extending stroke: F E = 𝑥𝐷 2 𝑥𝜌𝑔 − 𝐹𝑠 D = piston diameter, g = working pressure, Fs = spring force

CUSHIONING

to prevent sudden damaging impacts Rubber for small cylinder Air cushion for larger cylinder

CYLINDER MOUNTING

SPECIAL CYLINDER

Twin rod Lead rod Multi-position rod Locked rod Cylinder without Rod Slide unit Hollowed rod cylinder Air chuck (grasping)

TWIN ROD

High lateral load resistance High non-rotating accuracy High precision and ideal for pick and place operations

MULTI-POSITION ROD

LOCKED ROD

CYLINDER WITHOUT ROD

For limited space

SLIDE UNIT

High precision

HOLLOWED ROD CYLINDER

For direct connect to vacuum tool For pick and place work

AIR CHUCK (GRASPING)

For gripping in robot application

ROTATED ACTUATOR

Types of rack and pinion Types of ram Air motor

RACK AND PINION

90 or 180

RAM

90 or 180 or 270

AIR MOTOR