Circuit diagram (pneumatics)
A circuit diagram (also circuit diagram ) in pneumatics is the graphic representation of a pneumatic circuit . It does not take into account the real shape and arrangement of the components, but is an abstract representation of the pneumatic functions and the compressed air flow. These plans are created at the beginning of the design of a system, a device or an assembly and are also required later for repairs and maintenance.
Circuit diagrams
A good overview of the various circuit symbols in pneumatics is provided by the list of circuit symbols (fluid technology) , in which most of the symbols for pneumatic fluid elements are listed. A complete, pneumatic circuit diagram contains, in addition to the compressed air generation, a maintenance unit, one or more manually or automatically operated valves as actuators and one or more pneumatic cylinders as working elements .
Pneumatic circuit diagrams valued according to standard DIN ISO create 1219-2 (fluid power diagrams). They show all working and control circuits, the steps in the workflow, the components of the circuit with their identification, as well as the lines and connections. The spatial arrangement of the components is usually not taken into account.
Schematic representations
Actuators (valves)
A closed ball check valve.
An open ball check valve.
Circuit symbol for the one-way flow control valve
cylinder
- Functional principle of pneumatic cylinders
Single acting cylinder
Double-acting cylinder
Maintenance unit and working links (cylinder)
- Maintenance unit, actuators and working element
Maintenance unit icon
Maintenance unit in detail
Pneumatic cylinder with two one-way flow control valves
.svg)
Complete circuits
The designation standard for pneumatic equipment is ISO 1219-2
ISO 1219-2 2012
According to DIN ISO 1219-2, the following designation code is prescribed for components in fluid technology:
- Plant designation (plant number, entered without a sign)
- - (fixed separator)
- Media key (trade identification)
- Circuit number
- . (fixed separator)
- Part number (consecutive number)
According to the DIN ISO 1219-2 standard, the media code can be omitted if only one medium is used within the system.
Example
1-P2.3
1 = system number
- = separator
P = media code (trade identification for "pneumatics")
2 = circuit number
. = Separator
3 = component number
ISO 1219-2 to 2012
Element code
A = actuators
V = valves
S = sensors
Z = maintenance unit, cycle stage
P = pump, compressor
M = drive motor
The following samples are still according to the old ISO 1219
Direct control only makes sense for cylinders with a piston diameter of less than or equal to 20 mm. All larger diameters are controlled indirectly, as a smaller cross-section can be selected in the control line.
The suppliers are labeled with a Z 0Z because mostly the same suppliers are for all work elements.
The switches with S: 1S1 means the switch is assigned to the first cylinder and is the first switch, accordingly 1S2 is the second etc.
The work items are labeled A: A1 is the first, A2 is the second, and so on.
The processing elements are denoted by V, the same applies here as for switches 1V1 etc.
All labels must be framed.
Another scheme with 2 cylinders
software
There are various programs that can be used to create pneumatic circuit diagrams. General drawing or CAD programs such as B. Microsoft Visio or AutoCAD , for which pneumatic libraries often exist, or specialists such as B. Omegon Fluid Technology OFT2, which already have extensive pneumatic libraries. The circuit diagram program FluidDraw from Festo and Scheme Editor from Bosch Rexroth AG have established themselves in recent years .
Individual evidence
- ↑ Omegon Fluid Technology OFT2 ( Memento of the original from September 20, 2010 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Festo AG & Co. KG
- ^ Bosch Rexroth AG
