DRELOBA
DRELOBA was a pneumatic control system ( fluidics ) from the 1960s to 1980s. The binary logic was operated with compressed air of 1.4 bar . The Dre sdner Lo gik- Ba usteine were presented at the Industrial Exhibition "technica 66" in Dresden for the first time. They were manufactured by VEB Steuerungwerk Dresden, Großenhainer Str. 1–5, which was later renamed VEB EAW -Elektronik Dresden. Sunvic Regulator GmbH sold the system in the Federal Republic of Germany for two decades. The emerging microelectronics with ever smaller circuits and the programmable logic controller replaced pneumatic control systems.
Heinz Töpfer (born July 5, 1930 in Neu-Dobra; † Feb. 11, 2009 in Dresden) researched scientific research with his colleagues at the German Academy of Sciences (DAW), control engineering department in Dresden (head: Heinrich Kindler ) Basics for this innovative control system (1964 national prize for a collective). In 1963 Töpfer defended his dissertation comparative studies of pneumatic components and devices of control and regulation technology in the normal and low pressure range at the TU Dresden .
construction
The basic building block was the double membrane relay (DMR) - see picture on the right. It was made from plastic. The two membranes were firmly connected to one another via a web. The diaphragm stroke was 0.1-0.15 mm. The area ratio of the outer to the inner chamber was 2: 1. It was available individually with 5 hose connectors for hoses with a nominal width of 2 mm. All logical basic functions could be implemented with different pin assignments.
The extended double membrane relay had two more chambers, right and left, which functioned as two additional OR inputs.
There were also three basic modules combined to form universal modules (top picture) with freely available relays or as permanently connected modules ( RS flip-flop , gate module , signal switch ). These modules of the DRELOBA system were assembled into compact functional units with the help of connecting plates in which only certain holes were drilled. Sealing rubber, screws and U-profile rails held the function block together, on the front and back of which the universal modules were mounted. Only the compressed air supply and the few hoses to the sensors and actuators had to be connected from the outside.
Technical data in comparison
| system | DRELOBA | SAMSON AG
(formerly SAMSOMATIC GmbH) |
USEPPA |
|---|---|---|---|
| dimension | 18 × 16 mm | 25 × 30 × 20 mm | 26 × 26 mm |
| Dimensions | 10 g | 50 g | 30 g |
| Diaphragm dimension | Ø 13 × 0.5 mm | Ø 16 × 0.5 mm | Ø 20 × 0.3 mm |
| Nominal size | 2 mm | 2 mm | 2 mm |
| Supply pressure | 1.4 bar | 1.6 bar | 1.4 bar |
| minimum switching time | 2 ms | 6 ms | 5 ms |
| Max. Switching frequency | 250 Hz | 85 Hz | 100 Hz |
| lifespan | > 10 9 switching cycles | > 10 9 switching cycles | 2 · 10 6 switching cycles |
The UNALOG system (universal low-pressure analog and logic system) was also produced in the 1960s.
Advantages:
- at that time smaller than comparable relay controls
- small cylinders can also be connected without an amplifier or converter
- Explosion safety without additional effort
- simple and straightforward mode of operation
- Unlimited air supply
- faster than piston based valves
- Self-cooling by the operating medium air
Disadvantage:
- if the compressed air is not oil-free, small openings can stick
- Troubleshooting is difficult in compact function blocks
- limited transmission speed
- limited transmission distance
Available functional units
With a ventilation or ventilation pilot control, the DMR could be switched with route inputs. With this, buttons, limit switches and electrical-pneumatic converters were implemented.
There were also:
- Limit switch (analog-digital converter)
- Paper tape reader
- Impulse generator
- Pulse counter
- Binary indicator (a drive piston pushes a colored plate through a multi-slotted cover)
- Numeric indicator (pistons of different sizes pull a rope that turns a dial)
- Booster (for cylinders up to 6 bar and a volume flow up to 30 m³ / h).
Individual evidence
- ^ DEFA film The Eyewitness. 1968/01
- ^ A b Hans-Joachim Zander, Georg Bretthauer: Prof. Heinz Töpfer on his 80th birthday. In: at - automation technology. Volume 58, No. 7, 2010, pp. 413-415.
- ↑ a b Heinz Töpfer, Arnulf Schwarz: Knowledge storage fluid technology. Fachbuchverlag, Leipzig 1998, ISBN 3-343-00246-1 , p. 133.
literature
- Gisela Krause, Uwe Neuendorf: History of pneumatic automation technology in the Dresden area. Part 1: Development of research, development and product potential as well as ... pneumatic control system DRELOBA. Hänsel-Hohenhausen, Egelsbach 1994, ISBN 3-89349-519-3 .
- Dieter Klemenz: Development of a programmable, pneumatic control. In: IPA research and practice. Krausskopf, Mainz 1979, ISBN 3-7830-0171-4 .
- D. Hundorf: Freely programmable, pneumatic standard control for the automation of discontinuous processes. Sunvic Regulator GmbH, Solingen August 5, 1969.
- B. Wagner, G. Schwarze: Pneumatic building block systems of digital technology - with special consideration of the Dreloba control system. Vieweg, Braunschweig 1967.