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APPENDIX >
Technical information about products
Calculation vacuum generators
Based upon our experience and upon the values
measured during the system design,
we recommend to choose the vacuum generator
depending on the diameter of the suction pad,
according to the table below:
Note:
The indicated values apply to all types of vacuum generators.
The recommended suction rate is for a single suction pad and is valid only for
smooth, air-tight surfaces. For porous surfaces we recommend the execution
of a suitable test before the selection of the vacuum generator.
Calculation of the required suction rate V [M
3
/H, L/MIN]
V = n x VS
n = number of suction pads
V
S
= required suction rate
for a single suction pad [m
3
/h, l/min]
Required suction rate as a function of the suction pad diameter
Suction pad ø
Required suction rate Vs
up to 20 mm 0,17 m
3
/h
2,83 l/min
up to 40 mm 0,35 m
3
/h
5,83 l/min
up to 60 mm 0,5 m
3
/h
8,3 l/min
up to 90 mm 0,75 m
3
/h
12,7 l/min
up to 120 mm 1 m
3
/h
16,6 l/min
Selection of vacuum switches
Vacuum switches and pressure gauges are
normally selected on the basis of the functions
required in the application and on the
switching frequency.
The following functions are available:
- adjustable switching point
- fixed or adjustable hysteresis
- digital and/or analog output signals
- status LED
- display with keypad
- connection with M5 Female thread, G1/8 Male
flange or plug-in tube
Example:
- vacuum switch SWD-V00-PA with digital
display, adjustable switching point and
adjustable hysteresis (already integrated in the
compact ejector)
- pressure gauge.
We choose a compact ejector Mod. VEC-20 with a suction rate of 116 l/min.
Example: V = 6 x 16,6
V = 99,6 l/min
The suction rate values of the different vacuum generators can be found
in the table Technical Data.
Selection of the vacuum switches and pressure gauges
Even if you are confident that the results of the system-design work are correct, you should still carry out tests
with original workpieces to be on the safe side.
However, the theoretical system design will give you a good idea of the general parameters for the intended application.
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