Natural Frequency Vibrating Conveyors

7/28/2019 Natural Frequency Vibrating Conveyors

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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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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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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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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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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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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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Natural Frequency Vibrating Conveyors