Pneumatic Actuators for power, motion and control

Introduction

» Pneumatic actuators include linear cylinders and rotary actuators.
» They are devices providing power and motion to automated systems,
machinesand processes.
» A pneumatic cylinder is a simple, low cost, easy to install device that is
ideal for producing powerful linear movement.
» Speed can be adjusted over a wide range.
» A cylinder can be stalled without damage.
» Adverse conditions can be easily tolerated such as high humidity, dry and
dusty environments and cleaning down with a hose.
» The bore of a cylinder determines the maximum force that it can exert.
» The stroke of a cylinder determines the maximum linear movement that it
can produce.
» The maximum working pressure depends on the cylinder design. VDMA cylinders work
up to 16 bar.
» Thrust is controllable through a pressure regulator.

Fundamental designs

» Pneumatic actuators are made in a wide variety of sizes, styles and types
including the following
» Single acting with and without spring return
» Double acting
» Rodless
» Rotary

Single acting spring return

Single acting cylinders have a power stroke in one direction only

Single acting no spring

Gravity or other external force to return the rod

Double acting

» Double acting cylinders use compressed air to power both the outstroke
and instroke.
» Superior speed control is possible
» There are
 Non-cushioned types
 Fixed cushioned types
 Adjustable cushioned types

Double acting non-cushioned

» Non cushioned cylinders are suitable for full stroke working at slow speed.
» Higher speeds with external cushion