Rhein-Nadel Automation GmbH
8
VT-MA-SRC 160-800-EN_2019 / 20.03.2019 SJ
Noise emission
The noise level at the place of use depends on the complete line in which the hopper will be incorporated and on the
material to be sorted. For this reason, sound pressure levels in accordance with the 'Machinery' directive can only be
determined at the place of installation.
If the noise level at the place of use exceeds the permissible, sound-insulating hoods can be installed which we can
offer on request (see our catalogue).
2.1.
Applicable directives and standards
The vibratory feeders have been manufactured in accordance with the following directives:
•
EC Low-Voltage Directive 2014/35/EU
•
Electromagnetic Compatibility Directive 2014/30/EU
We assume that our product will be incorporated into a stationary machine. The requirements of the EMC Directive
must be satisfied by the user.
The applicable standards are specified in the Declaration of Conformity.
3.
Design and functional description
Vibratory feeders serve for feeding and orienting parts. The driving force is provided by an electromagnetic coil. The
figure below is a schematic representation of a vibratory feeder:
Driving magnet D is rigidly connected to counter mass F. When the driving magnet is energized it exerts a force on
armature E. This force is transmitted to bowl A mounted on spring packs C, causing the bowl to vibrate. The angle of
the spring packs defines the direction of bowl movement.
Due to these vibrations the parts are lifted off the spiral feed track inside the bowl and thrown forward in tiny steps (mi-
cro throw principle). The direction of this throwing movement is perpendicular to the plane of the spring packs.
The driving magnet achieves its maximum power of attraction twice within each period of the alternating current. Con-
sequently, the vibration frequency is double the mains frequency (100/120 Hz).
If heavy orienting tooling is mounted, the alternating current is changed to obtain a low vibration frequency (50/60 Hz).
The vibration frequency of your feeder is indicated by the last digit of its type designation:
-1:
50 Hz-50 vibrations / sec.
-2:
100 Hz-100 vibrations / sec.
A
Feeder bowl
B
Parts handled
C
Spring pack
D
Driving magnet
E
Armature
F
Counter mass
G
Shock absorber