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174 Erol Murad et al.
Figure 4 presents a simulated experiment where the measured force
decreases continuously and slowly. Transducer works well with an air
consumption similar to the previous experiment.
If it is considered that the opening between two orders of distributor DP,
pressure may decrease too much due leaks and wear, hourly air consumption
would be maxim 135.42 Ncm 3 / h, which is a small volume. For example in
continuous operation for 24 hours would consume 3.25 Ndm 3 air, which would
require a reservoir of 2 dm 3 uploaded once a day to 3 bar.
5. Conclusions
1. We designed a pneumatic force transducer for particular process
consisting in a slow change of the measured force, typical for convective
drying.
2. Transducer operates with very low air energy consumption, is simple,
affordable, sustainable, low-gauge and weight.
3. They were applied mechatronics and automation principles at low cost
for transferring as many functions to PLC management of the technological
process.
4. For exhaust valve nozzle-ball version has been used to ensure normal
operation even in difficult assembly and operation, ensuring a good seal chosen
option and a relatively large exhaust section to small movements.
5. On the dynamic, by controlling the very low input flow , in a chamber
measuring small volume, for reaching a maximum speed of less than 100 mm/s 2
for the mobile part, and a maximum displacement of 0,3 mm. These values
show that there are no shocks during the operation, and sustainability of nozzleball
system is very high.
6. Simulation experiments show that a transducer with head scale of 50 N
can operate continuously 24 hours powered by a 2-liter tank loaded to 3 bar
once a day.
7. The results obtained in simulated experiments represent tests of the
experimental model, which pursue to prove both design and functional
optimized variants functional, through change values for pair ball diameter and
nozzle diameter.
Received: March 20, 2010
1 POLITEHNICA University of Bucharest,
Faculty of Biotechnical Systems
Bucharest, Romania
e-mail: erolmurad@yahoo.com
2 INOE 2000-IHP
Bucharest, Romania
e-mail: dumitrescu.ihp@fluidas.ro