Design and function
© Festo Didactic Conveyor 43
If a carrier is located above the stopper, the measuring element is pressed against the carrier by the force of
the spring between the measuring element and the cylinder body. The spring force is low enough that the
carrier is not pushed upwards and is strong enough for the measuring element to return to the basic
position after the carrier has left the stopper.
Downward movement:
If the valve coil or manual control of the monostable 5/3-way valve is actuated, the valve changes to the
working position. The lower chamber of the cylinder is vented through the throttle of the one way flow
control valve -RZ2, while -RZ1 causes the compressed air to flow unimpeded into the upper chamber of the
cylinder. This is therefore also an exhaust air throttling. Thus, the speed of the downward movement can be
adjusted via -RZ2.
During the downward movement, the spring of the cylinder and the spring between the measuring element
and the cylinder body are additionally pretensioned.
Monostable 3/2-way valve with throttling and single-acting cylinder
This variant can not be used since
the speeds for the extension and retraction movement can not be set independently of each other
due to the small size of the single-acting cylinder, a precise adjustment of the supply air throttle is made
more difficult => noise
In the case of small sizes of the single-acting cylinder with exhaust air throttling, no sufficiently large
compressed air cushion can be built up in the chamber so that the mechanism of the exhaust air
throttling has a positive effect
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