6
3 Design and function
Vibration is generated by a freely
oscillating, automatically reversing
piston. Both masses, the piston on the
one side and the mass fastened to the
housing on the other, thereby vibrate
against each other in proportion to their
total weights.
Compressed air or nitrogen enters
through port 1 into the housing and is
alternately guided through a groove
and the pilot bores in piston 3 into the
air chambers 9 and 10. The changing
pressure in these chambers drives the
piston.
The presently depressurized chamber
is ventilated through the openings 6.
Once the piston passes past these
openings the air can no longer escape
– leaving an air cushion. This prevents
a hard impact and initiates an
additional impulse, to the linear force.
If a lower vibration amplitude is
required, simply throttle the exhaust air
flow.
If a lower frequency is required, just
throttle the air supply, e.g. by means of
a pressure regulator.
The illustration shows a piston position
which may occur in case of horizontal
mounting. In this position the vibrator
will not start. For this reason units of
group 2 have a port 11 in the base
plate 5, so that the piston 3 can be
moved to the start position by applying
a short pressure shock. This requires
an additional 2/2-way valve.
Units of group 1 are equipped with a
starting spring between base plate 5
and piston 3 (Exception: NTS 21/04
without starting spring).
1
2
3
4
5
6
9
10
11
12
Air inlet
Cover
Piston
Housing
Base plate
Exhaust port
Air chamber
Air chamber
Start port (optional)
Bore for synchronizing
control (optional)
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