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Naturalfrequencyvibrating
conveyors
Especially designed for tough jobs.
High capacities when requested.
Driven by an unbalanced motor.
Reduced energy consumption and maintenance.
Possibility of incorporating cooling or heating
processes.
Made following the EC directives.
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Natural frequencyvibrating conveyors
Description and fonctionment
The natural frequency vibrating conveyor consists of a trough mounted on an elastic element
and driven by an electric motor via an elastic connecting rod, which causes sinusoidalmechanical vibration.
Trajectory of particles being conveyed Trough
Elastic elements Drive unit Elastic connecting rod
The functioning is based on obtaining a common frequency between the elastic system and
the drive unit. The used system relies on the energy conservation theorem. If an elastic
element, supporting a certain mass, is pressed or stretched with a certain force, it absorbs
and supplies the same energy. Though the number of oscillations will be the same with the
same force.
The drive unit is formed by a vibrator whose eccentric defines the whole oscillation
amplitude. The transmission between the motor and the vibrator axle is made through a belt.
When changing the pulleys diameters the driving frequency is syntonized with the system's
natural frequency.
The elastic system is composed by a range of springs that hold the conveying trough.
Helicoidal springs -made of special tempering steel and shoot peening treated- are normally
used as elastic elements.
The drive unit is composed by a crankshaft equipped by one or more elastic connecting
rods, driven by an electric motor through trapezoidal belts.
The whole system can be installed either on an isolated reaction mass, supported by a
concrete block or anchored to the floor incorporating a structure able to absorb the
transmitted dynamic efforts, in order to reduce them.
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Natural frequencyvibrating conveyors
When starting up, the drive unit gradually increases its speed until reaching the rated
frequency thanks to the elastic connecting rod. The drive unit amplitude remains constant.
However, the trough begins to vibrate at a constant frequency and the amplitude increases
until it reaches its rated displacement (I).
At the stop, the phenomenon is reversed. The connecting rod maintains the same amplitude
whilst the frequency diminishes. The amplitude of the trough however decreases while the
frequency remains constant (II).
Drive unit Vibrating element Drive unit Vibrating element
Frequency (I) Frequency (II)
The power requirement to maintain a natural
frequency vibrating conveyor is extremely low since
the elastic elements themselves act as accumulators of
energy.
The energy supplied by the electric motor is only the
energy required to replace losses caused by the
friction.
Total energy Energy absorbed
requirements by the drive unit
Energy produced by the elastic
element
The conveying t roughs or channels can be
produced in various shapes, allowing dust-tight or
open elements, adapted to the installation
requirements.
In some specific applications, clutch sections can be
eventually installed, acting as lung, keeping the
product on the trough. Besides of this, the trays can be
equipped with different elements in order to separate
or classify the product to be handled, or even to cool
(by injecting air or circulating water) or heat (through
infrared radiation or electric resitance).
The natural frequency vibrating conveyors are especially used for big lengths, reaching up to
30 meters with one vibrating group. They solve very different problems, offering elegant and
simple solutions. The production is remarkably improved, thanks to their important flows,
their long life, their high reliability and their low energy consumption. Their rough designassures a continuous service, free of troubles, even in the most exigent conditions, with a high
efficiency and a minimum maintenance.
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Natural frequencyvibrating conveyors
FL light serie
The FL serie vibrating conveyors are of simple construction since they consist of a sheet-metaltrough mounted on a mild steel fabricated base on which several resonant units are
incorporated, the drive unit being centrally mounted.
These machines are used to convey light materials, from a small flow up to a maximum flow of
about 15 metric tons per hour.
Their application range is very diverse, as they are used for conveying chemical products,
cement, refractory material plants or certain shavings from machine tools.
FL conveyor for mould sand, in casting. Its width is of 620 mm and its length 24 m. It reaches a flow
of 10 tons per hour.
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Natural frequencyvibrating conveyors
FX Middle serie
The FX serie has been designed for higher requirements than the FL serie, conveying up to
40 kg pieces.
The applications are similar to the FL serie, being able to convey heavier prodcuts and higher
flows.
FX vibrating conveyor used for recycling aluminum shapes. Its width is of 900 mm and the total
length of 220 m. The installation transports a 4 ton flow and is made by 10 independent parts.
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Natural frequencyvibrating conveyors
FN Heavy-duty serie
FN serie conveyors are especially apt for heavy-duty work, under very extreme conditions
such as abrasion, shock or high charges.
These conveyors are of rugged design, giving trouble-free service, even under the direst
conditions, furnishing high capacities and virtually maintenance free operation. Its
ruggedness enables it to transport materials of large size up to pieces of several hundred of
kilograms. Its range of application is very diverse: quarries, foundries, steel mills, mines
When conveying, other operations can be carried outdone: separation, distribution, heating
One of the most usual operations is in foundries, to transport red-hot castings, and the
separation of sand during conveying. It can convey material at a very high temperature, for
which purpose special troughs are built, supported on the main frame by springs, which
absorb the trough deformations, thus avoiding damage to the main frame.
The troughs can have very rugged grizzlies, bottom collectors, as well as discharge gates.
Complete airtight, dust free installations are also manufactured.
Ashes recuperation, after coal combustion in a thermal station, for cement production.
Waste recycling. Driving motor detail.
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Natural frequencyvibrating conveyors
Some examples of application
Waste recycling. Casting.
Clinker. Ashes.
Casting pieces.
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bout URBAR
esearch on vibrators and
ts application on concrete
nd industry since the
iftiesur Test Laboratory,
IRLAB, makes to be
eaders in technology.hrough our R+D
epartment, we have
eached a high quality
evel with resistant andeliable equipments.
ur technical know-how
uarantees the best design
nd the highest efficiency for
very installation.
ur specialists technicalssistance assures the after
ales service.
ull scope in vibrating
quipment.
e work with vibration.
e deal with vibration.ibration is our job.
Electric internal vibrators.
Frequency converters. Hydraulic internal vibrators installed in earth moving machines
to vibrate big masses of concrete.
Electric and pneumatic external vibrators.
Air canons.
Vibrating applications, Engineering, everything in Vibration.
Vibration, Dynamic and Seismic Tests Laboratory.
Calibration in acceleration and frequency fields.
Offices in Barcelona, Bilbao, La Corua, Madrid, Oviedo,
Sevilla, Valencia and Zaragoza.
Ctra. Villabona-Asteasu, km 3
Apartado 247
Tel. (+34) 943 691 500
Fax (+34) 943 692 667
E-20159 As te as u
http://www.adegi.es/urbar
E-mail: [email protected]
F N / 2 2000.08
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