Pneumatic Circuit Design Part 1

Mechatronic Automation

Pneumatic Circuit Design

Dr. Lei Cui Department of Mechanical Engineering Curtin University

Circuit Layout  ISO

1219-2: the standard for circuit c ircuit diagrams

 Minimum  A4

crossing lines

format or A3 A3 folded to A4 height height

 To

be on several sheets if necessary with line identification code

 Limit

valves position of operation by actuators shown by a marker with reference code to symbol

Circuit Layout  All

actuators at the top of the page in order of  sequential operation

 Other

components in sequential order from the bottom up and from left to right

 Draw

cylinders and directional valves horizontally

Circuit Layout  Show  Draw

elements in the initial position of control

pipelines straight without cross-over  wherever possible

Documentation  Step

diagram

 Circuit

diagram

 Description

of the operation of the system

 Technical

data on the components

Structure of Pneumatic Systems  Signal

flow

 – From bottom to top

 Signal

flow

 – S P A principle: Sensor, processor, actuator   – I P A principle: input, processing, output

 Energy

supply

 – Through tubing or piping

Structure of Pneumatic Systems

Structure of Pneumatic Systems Working element Control elements Processing elements Input elements

Supply elements

System Circuit Diagram  Identification

code for components

 – System number beginning with 1  – Circuit number beginning with 1  –  All accessories with 0  – Component identification by number   – Component number beginning with 1

System Circuit Diagram  Identification

code for components

 – Component designation by letters • Working elements: A • Compressors: P • Sensors: S • Valves: V • Others: Z

 – Component number  • Beginning from 1 • Number assigned from left to right, from bottom from top

System Circuit Diagram 1A 1V2 1V1 1S1, 1S2, 1S3

0Z, 0S

System Circuit Diagram

Control of Single Cylinder 

Control of Single Cylinder   Direct

control of a single-acting cylinder 

 – Piston extends when button held down

Control of Single Cylinder   Indirect

control of a single-acting cylinder 

Control of Single Cylinder   Indirect

control of a single-acting cylinder 

 – Instroke speed control

Control of Single Cylinder   Indirect

control of a single-acting cylinder 

 – Outstroke and Instroke speed control

Control of Single Cylinder   Indirect

control of a single-acting cylinder 

 –  Automatic control

Control of Single Cylinder   Indirect

control of a single-acting cylinder 

 – Draw the complete circuit (with energy supply) and identify the five levels of pneumatic structure of the circuit

References  Pneumatic

Handbook, Trade & Technical Press

Ltd.  Andrew

Parr, Hydraulics and Pneumatics – A Technican’s and Engineer’s Guide, Butterworth Heinemann

 Peter

Croser and Frank Ebel, Pneumatics – Basic Level, Feso