A robotic pneumatic system uses compressed air to create fast, repeatable motion in mechanisms such as grippers, arms, and lifting devices. The system begins with a compressor that pressurizes air and stores it in an accumulator tank. Air then passes through control components that set pressure, direct flow, and protect the robot.
Understanding the full circuit helps students see how electrical commands become mechanical motion.
Key Facts
- Pressure is force per area: P = F/A.
- Cylinder output force is found from F = P A, where A is piston area.
- Air flows from high pressure to low pressure until a valve redirects or blocks it.
- A regulator reduces stored tank pressure to a safe working pressure for actuators.
- A solenoid valve uses an electric signal to switch air flow paths.
- Cylinder piston area for a round bore is A = πr^2.
Vocabulary
- Compressor
- A compressor is a device that takes in air and raises its pressure for use in a pneumatic system.
- Accumulator
- An accumulator is a storage tank that holds compressed air so the robot can use bursts of air quickly.
- Regulator
- A regulator is a valve that lowers and maintains air pressure at a chosen working value.
- Solenoid Valve
- A solenoid valve is an electrically controlled valve that directs compressed air to different ports.
- Pneumatic Cylinder
- A pneumatic cylinder is an actuator that converts air pressure into straight-line mechanical motion.
Common Mistakes to Avoid
- Ignoring the regulator, because tank pressure is often too high for cylinders and valves to use safely.
- Connecting both sides of a cylinder to pressure at the same time, because opposing forces can stall the piston or create unsafe loads.
- Forgetting exhaust ports, because air must leave one side of the cylinder for the piston to move smoothly.
- Using diameter instead of radius in A = πr^2, because this makes the piston area and force calculation four times too large.
Practice Questions
- 1 A pneumatic cylinder has a piston radius of 1.5 cm and is supplied with air at 400 kPa. What is the ideal extension force in newtons?
- 2 A compressor fills a 2.0 L accumulator to 600 kPa, and a regulator supplies cylinders at 300 kPa. If a cylinder needs 0.25 L of air at 300 kPa per stroke, about how many ideal strokes can the stored air provide before dropping to the regulated pressure?
- 3 Explain why a robot might use an accumulator between the compressor and solenoid valves instead of connecting the compressor directly to the cylinders.