3.1 Explain the concept pneumatic devices

3.1 Explain the concept pneumatic devices

•      It operates by a combination of force created by air and spring force.

•      Used to control processes requiring quick and accurate responses, as they do not require a large amount of motive force

 Figure : pneumatic cylinder

 3.1.1 Describes the Basic Pneumatic System

Two common types:

1. Single action cylinder (SAC)
2. Double action cylinder (DAC

 

 Figure: single acting

Single-acting cylinder /system

•      modified with a compressed spring mechanism,

•      inserted between the end of the cylinder and the side of the piston opposite where the compressed air enters.

•      after the compressed air is released, the piston is forced back down to its original position at the end of the cylinder by the spring.

•      used for repeated, linear motion involving heavy loads, and requires a greater force of compressed air to complete its task.

 (source: http://pneumatics.blog.com/

http://www.ehow.com/how-does_5575225_pneumatic-cylinder-work.html  )

Figure: double acting

  Double-Acting cylinder/System

•      Use valves to inject two different streams of compressed air, alternating on either side of the piston.

•      One burst of compressed air pushes the piston out

•      Another burst pushes it back it to the starting position

 (source: http://pneumatics.blog.com/

http://www.ehow.com/how-does_5575225_pneumatic-cylinder-work.html  )

 Figure: Robot using pneumatic actuators

 Figure: pneumatic cylinders

  Figure: Robots using pneumatic actuators

 Figure: Robot using pneumatic actuators



VIDEO: Human like arm and fingers using advance pneumatic actuators!!!

 

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