Cylindre pneumatic

3. DIFFERENT TYPES OF PNEUMATIC JACKS

For general applications, we meet:

• The single-acting cylinder: by pushing or more rarely by pulling, a spring brings back the cylinder in its initial position. Only one air intake is sufficient.

• The double-acting cylinder: you have to send alternately air on each side to get a go and a return

3-1-Single-acting cylinder

Single-acting cylinders are used for simple work (examples: clamping, ejection)

PRINCIPLE OF OPERATION:

When the air enters the chamber on the bottom, it pushes the piston and the stem. The contained spring

in the other room is compressed.

When the bottom side chamber is exhausted, the spring returns the piston and rod returns. If the exhaust is slowed, the retraction of the cylinder rod is braked.

3-2-The double-acting cylinder

The double-acting cylinders are used everywhere or the return trip is a work phase.

PRINCIPLE OF OPERATION:

When the air enters the chamber on the bottom, it pushes the piston and the stem. The air contained in

the other chamber is pushed back to the exhaust. If the exhaust is slowed down, the exit of the rod the cylinder is braked.

When the air enters the chamber next to the stem, it brings back the piston and the stem comes back, the air of the room side bottom is repressed in the exhaust. If the exhaust is slowed, the return of the cylinder rod is braked.

4- Example of pneumatic applications:

In the world of industry, factory machines are a much more widespread and perhaps interesting application of pneumatics. When we think of robots, we usually think of electronic circuits making arms move using things like stepper motors (electric motors that turn through precise amounts, one step at a time), but they're just as likely to use hydraulics and pneumatics—as well, or instead. Computer-controlled robots might be holding pneumatic paint-sprayers, for example, or hydraulic cutting tools. Pneumatic factory machines are widely used to pick up and place objects using suction to hold things or squeeze them very gently, then release them some time later. Robotic cow-milking machines that automatically attach and release suction cups to an animal's udders are a clever variation on this pneumatic theme, and they illustrate an important advantage of pneumatics: it can apply force very gently.

Pneumatic devices

Since the 19th century, a smaller-scale version of this idea, pneumatic transport tube technology, has been widely used by banks, hospitals, and even hamburger restaurants to move things swiftly and securely down networks of air tubes from one part of a building to another. In these kinds of transportation, compressed air makes things move, but in other systems, it can also bring things rapidly to a halt: for example, it powers the air brakes in large vehicles such as trucks and railroad engines and exploding automobile airbags(though they're not really pneumatic, according to my strict definition).

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