Vibrators & vibrating machines

Welcome to the websites of Webac Vibrator GmbH,
your specialist for vibration technology with its multiple uses.

Since 1983 we produce and deliver a big number of different oscillation exciters and offer individual vibration solutions to satisfy the customer’s unique requirements.

The activities of our company are focused on fulfilling our customers’ wishes in a flexible and fast way by making use of our expertise.

Because your satisfaction is our main priority, we assist you with all our expertise in vibration technology since 1983. Pneumatic vibrators, electric vibrators, hydraulic vibrators as well as vibrating machines, vibrating plates and tables are natch parts of our products and service programme.

We offer our Webac pneumatic vibrators in different versions. Whether ball, turbine, piston or roller vibrator, we have the right pneumatic vibrator for your purpose.

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The Webac vibrator motors feature a high degree of efficiency coupled with a small profile yet extremely robust cross section.

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The Webac Vibrator GmbH supplies the complete series of the compressed air turbine vibrators when desired also with ATEX-Certification.

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Our vibrators are installed in vibration- technical equipment. We offer, for example, vibrating tables for various application areas.

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As your satisfaction is very important for us, we focus our work in accordance with your specifications. Talk to us, and we will solve your problem, too.

Our opening hours:
Monday to Thursday: 8.00 to 16.00
Friday: 8.00 bis 13.00

What is vibration?

Generally speaking, vibration is an oscillation
An oscillation is generated by removing a mass from its centre of gravity. As an example, a pendulum generates an oscillatory movement.

Any mass being set in motion generates ENERGY. This occurs, for example, with earthquakes agitating huge masses which are able to destroy all human constructions, and with tree-shaking in order to harvest fruit without great effort.

These energies and their applications are calculated by means of vibration technology.

As a source of drive, applied VIBRATION TECHNOLOGY requires so-called vibration exciters, e.g. external vibrators. External vibrators feed circular or linear oscillatory energy in periodically changing directions in order to enter their force into the mass to be agitated. 

With the help of these vibration exciters, vibratory technology allows for the excitation of the mass to be set to motion predominantly by means of periodical force and thus creates an oscillation with a determined frequency and amplitude.

When an unbalance is being generated, the excited mass follows a circular or elliptical path whereas a linear-type vibrator makes the mass move in a forward-and-backward direction.

There are three common types of energy for the drive of vibrators: pneumatic, electric, or hydraulic energy.


Important fields of application are:

Conveying
The particles of the goods to be conveyed are pushed at a certain angle and in a way to create a succession of micro-size throwing movements to generate a conveying movement in one direction.

Dissolving
Individual bulk goods particles are dissolved from a material aggregation by means of vibration. A frictional reduction makes sure the material is slackened and allows for the flowing of the material, respectively.

Compressing
The reduction of friction among material particles results in a particle rearrangement. With the help of gravity, increased material density together with simultaneous de-aeration is obtained.

Places of application
Among others, our external vibrators are employed in the following fields of industry: conveying, dosing, weighing, and sieving technologies, chemistry, mining, mechanical engineering, non-metallic mineral processing, metallurgical, packing, building construction and food industries, foundries, climate and de-dusting technologies.

The vibrators are in use with dosing, discharging, de-dusting, de-watering, de-airing, conveying, dissolving, slackening, compressing, mixing, sieving, sorting, cleaning, checking, feeding, etc.

The external vibrators can be mounted to: construction machines, silos, hoppers, conveying troughs, bowl feeders, vibrating conveyors, moulds, boarding units, vibrating tables, stone-shaping machines, surface dressing machines, vibratory boards, racks, and grates, filtering systems, downspouts, packing machines, and many others.


Types of actuation

Two types of vibration can be generated:

1. CIRCULAR VIBRATION by means of only one vibrator: in any case, the centrifugal force continuously changes its direction. The structure linked to the vibrator is moved elliptically.

There are three possible types of energy: electric, pneumatic or hydraulic energy

Electric vibrator
Pneumatic vibrator:

1. Pneumatic ball vibrator
2. Pneumatic roller vibrator
3. Pneumatic turbine vibrator
Hydraulic vibrator

2. LINEAR VIBRATION

a) by means of only on vibrator; There are mainly two types:

Pneumatic piston vibrator:


Electric: ELECTROMAGNETIC VIBRATOR:


b) by means of two circular vibrators turning in different senses of rotation and thus generating a one-sided directional vibration. These vibrators have to be solidly linked on the same level. The horizontal components are located on the same level (base frame?) and have the same, but converse impact. This means, only those components placed vertically to this level are being considered, i.e. added. The vibration takes place along this direction.

[Translate to gb:] Kreisvibratoren
[Translate to gb:] Kreisvibratoren

What´s the usw of vibration

In almost all fields of modern industry, there are examples of the continuously increasing importance of vibration technology and thus of the application of pneumatic or electric vibrators. The following listing of applications is to be considered for orientation purposes only as it is not exhaustive at all!

There are three predominant fields of application:

Fields of applicationMain direction of power transmission
1. Conveying
2. Dissolving
3. Compressing

 

 


Conveying

Generally speaking, conveying deals with forcing goods to be conveyed to move in one direction. The individual goods particles or pieces, respectively, are pushed at a certain angle in a way that chain-like micro-size throwing movements are generated:

[Translate to gb:] Vibrationstechnik Fördertechnik

These are the main applications of this technology:

  • CONVEYING     FEEDING
  • DISCHARGING     DOSING
  • SORTING     LOADING
  • DISSOLVING (jam-dissolving)
  • SPEEDING-UP     MIXING
  • SEPARATING (see also dissolving)
  • SIEVING, SCREENING, etc. …

    … with all types of bulk goods: powder, nails, screws, wheat, vegetables, nuts, electric components, grains, clips, waste, hot cast parts, raw material parts, bottles, tins, cans, ampoules, pills, etc.


    Dissolving / Slackening

    On principle, dissolving and slackening is employed to dissolve individual parts from a material aggregation. This is achieved by reducing the friction between individual material particles or by eliminating strong adhesive forces.

    The main applications with this technology are as follows:

     

    • DISCHARGING  of silos, lorries, freight wagons, …
    • DE-DUSTING / DE-COKING  of filters, piping, …
    • SLACKENING  of sands, powders, flasks (foundries), bakings, …

    Mounting of the external vibrator

    Mounting of the external vibrator to the silo is an important item not only for the efficiency of the external vibrator but also for the integrity of the silo. In any case, the external vibrator must not be mounted directly to the wall of the silo or to the discharge funnel as material stress on these spots would be strong enough to crack the steel sheet there.

    In addition, the working impact of the external vibrator would be limited to a very small area only. In order to avoid these negative effects, a stiffening device facilitating the mounting of the vibrator has to be installed on the funnel.

    Welding (i.e. step-by-step welding) of a steel channel section has proven to be a simple and efficient way of stiffening.

    Depending on the size of the funnel, the steel channel section should be a U 80 to U 120 type with a minimum length of one third of the funnel edge length. It is recommendable to attach the steel channel section up to the transversal cross-bracing and to weld it to the cross-bracing. The external vibrator is mounted vertically to the axis of the steel channel section. The sense of rotation of the vibrator should be chosen in a way that, on looking onto the vibrator from the side, the unbalances move from top to bottom on the funnel wall.
    As the vibrator is acting against the rigid axis of the steel channel section, the funnel wall and the stiffening device are prevented from damage and the vibration generated by the external vibrator is distributed more efficiently.

    The screwed connections to fasten the external vibrator have to be re-tightened a short period after commissioning and their tight seating has to be checked in weekly inspection and maintenance intervals.

    It is recommendable to secure the vibrator against unintended falling-down by means of a steel wire rope sufficiently dimensioned for the vibrator’s weight.

    The external vibrators should only be switched on if the bulk material can flow off since, otherwise, an undesirable compression process may be started to exert unnecessary stress to the material inside the silo and to the weld seams on the mounting plate or the mounting section, respectively.


    Compressing

    Compressing serves for the rearrangement of particles within the material. Thus, friction among the material components is reduced (flowing process) and a maximum storage density and simultaneous de-aeration is obtained with the help of gravity or a superimposed load. The result: the air pore volume is minimised and the material is actually “compressed“.

    Among others, densification of concrete is absolutely necessary:

    Vibrating:

    Water and air escape upwards.
    Sand and gravel seep down to the ground.
    Perfect arrangement of material components

    The main application fields of this technology are as follows:

     

    • DE-WATERING of: concrete and many other materials
    • DE-AERATION of: concrete, cellulose, powder, molasses, …
    • FILLING of: freight wagons, packages, moulds, …

    Examples of application preamble

    1. As a rule, vibrators are firstly chosen with regard to their APPLICATION and secondly chosen with respect to their FREQUENCY. This is particularly true with electric and hydraulic vibrators.

    On employing the pneumatic vibration technology, another method is required in most cases:

    Predominantly, the formula: g x ∑ M is used.

    IN THE CASE OF A PNEUMATIC VIBRATOR, THE FACTOR “g” IS TO BE DETERMINED. THE VIBRATOR ITSELF ADAPTS THE FREQUENCY – AND THE AMPLITUDE – TO THE STRUCTURE.

    2. On working, pneumatic vibrators feature a loss of frequency. Therefore, the nominal centrifugal forces and frequencies indicated for idle running have to be corrected by recalculating them with the help of the following CORRECTION VALUES:

    Vibrator typeCorrection value for frequenciesCorrection value for forces
    VT (turbine-type)0.900.85
    VK (ball-type)0.750.60
    VR (roller-type)0.600.35

     

     

     


    Examples of application calculation

    I. Conveying

     

    FunctionsConveying, feeding, dissolving, speeding-up, Aufheben, etc.
    Fields of applicationConveying troughs, discharge troughs, conveying tubes, vibratory chutes, bowl feeders, etc.
    Frequency rangeNormal frequency, i.e. from 1,000 up to 3,000 min-1 (this does not apply to air vibrators!)
    The frequency depends on the weight of the material particles to be moved.

    The higher the particle weight, the higher the frequency.

    AmplitudeThe amplitude depends on the stiffness of the structure. The following values can be deemed to be correct and suitable:

    Frequencies in min-1    1.000    1.500    3.000

    Amplitude in mm    3,5 – 11    1,5 – 5    0,4 – 2

    Extreme Amplitude, that must not be exceeded in any case (please see item "Important information):    25    12    3
    Factor “g” = 1.8 to 2.2 of the total mass to be vibrated (mass of the material plus (minus?) mass of the installation and of vibrators).

    EXCEPTION: with horizontal vibration (e.g. sieving), these figures are halved in value.


    Required force F: ∑ F in daN =       ∑ M x 1,8 bis 2,2

    ∑ M in kg = M des Materials + M der Anlage + M der Vibratoren

    Factor “g” depends on the particle weight of the material:With light particle weight:  Y < 1 kg/dm3    g =< 1,8
    Smaller graining, e.g. powder

    With higher particle weight:  Y > 1 kg/dm3    1,8 <= g <= 2,2
    Smaller graining, e.g. powder?

     
    Power requirement

     

     

     


    Special applications:

    Conveying troughsfor transporting, dosing, feeding, weighing.
    Direction of forceInclination of 5° to 30°The inclination depends on the weight of the material particles to be moved. The higher the particle weight, the bigger the inclination.
    Type of vibrationsLinear or directed vibrationFrequency: adapt to Y

    Mounting spotMounting below the installation to be vibrated

     

     

     

    Piston/electromagnetic vibrators
    2 units of electric vibrators
    Length-related limitation(maximum field of efficiency): 2 to 3.5 m per vibrator, depending on the stiffness of the structure.

    In the case of applications involving two vibrators with different senses of rotation, the resultant is computed as follows:

    Vibrator output =                Fo    2 Fo
                                   FR =    ----------
    Useful output = FR                   √ 2


    Vibration bowlsFor sorting, grading, aligning
    Bowl feederslevel-bridging
    Vibration bowls
    Bowl feeders

    Direction of force->
    Type of vibrationDirected vibration
    Mountain spotMounting to the lower lateral part of the installation to be vibrated
    Piston-/
    Electromagnetic vibrators
    Circular vibrators for directed vibrations on bowl feeder
    Sieving: For separating, sorting, grading, de-watering, dehydration troughs, ceramics sieving, …
     
     

    Direction of forceMostlyException: Special sieving holes for grading

    Factor "g"Normal values are halved(exception: sieving of sticky materials)
    Predominantly, this applies to horizontal vibration.
    Type of vibrationMostly circular vibrationIn exceptional cases: directed vibrationFrequency: to be adapted as per particle weightFactor "g": to be adapted as per particle weight
    Mountain spotMounnting laterally onto the structure
    One or two pneumatic or electric vibrators rotating in the same direction
    One or two piston or electromagnetic vibrators or electric vibrators generating directed vibrations

    Examples of application calculation

    II. Dissolving

     

    FunctionsDischarging, de-dusting, slackening, cleaning of sand, lime, cement, coal, etc.
    Fields of applicationSilos, freight wagons, tipper trucks, filters, tubes, …
    Frequency rangeMiddle range from 1,500 to 3,000 min-1 (this does not apply to air vibrators!)The frequency depends on the type of the material particles to be moved.

    The stickier the material, the lower the frequency.1,500 min-1 with wet or sticky materials3,000 min-1 with dry and relatively liquid materials

    AmplitudeDepends on the frequency. The following values can be deemed to be correct and suitable:

    Frequencies in min-1        1.500    3.000

    Amplitude in mm        1,5 – 5    0,4 – 2Extreme amplitudes that
    must not be exceeded
    in any way (please see
    item “Important information“): 12    3,5
    Power requierementFactor “g” = 1.8 to 3.5 of the mass to be vibrated. This refers to the mass of material inside the silo to be vibrated only. The mass of the structure to be vibrated has to be determined with other applications.

    There are POSSIBLE EXCEPTIONS with special applications  Requiered force F: ∑ F in daN =    ∑ M x 1,8 bis 3,5

    ∑ M in kg =    M of material in the cone of a silo or M of the structure

    With dry, relatively liquid materials    1,8=< g =< 2

    With wet, sticky materials    2 =< g =< 3,5

     

     

     


    Special applications

     

    Dischargingof silos, hoppers, containers, flasks, …
    Direction of force

    → or ↗

    In each case, the direction of force runs vertically to the structure to be vibrated.
    Type of vibrationMostly circular, but also directed vibration
    Type of applicationPower: in most case, Factor “g” = 2 is sufficient with a cone inclination up to some 30°. With regard to this value, please see the applicable correction values listed below.
    - Mounting is done on one third of the cone length.
    - The vibrator must be fastened to a steel-type reinforcement piece in order to have optimum effect of the vibration onto the material.

     

     

     

    Mostly pneumatic vibrators of the turbine, ball, or piston types.
    Electric vibrators with bigger installations.
    (With dusty atmosphere, please see ATEX vibrator)

    Slackening / cleaning / de-dustingof filters, tubes, screens, flasks (foundries), …
    Direction of force

    → vertically to the structure

    Type of vibrationMostly circular, occasionally directed vibration.
    Lower frequency: max. 1,500 min-1 with electric vibrators.
    Exception: tube cleaning which requires high frequency.
    With air vibrators = adapt the exact frequency
    Power:
    Factor “g”: 2 to 2.5 of total mass of the structure to be vibrated
    Factor “g”: 2.5 to 3 with flasks
    With horizontal vibration, these values are halved.
    Mounting spotMounting is done laterally onto the structure
    Filter cleaning
    Filter cleaning

    Examples of application calculation

    III. Compressing

     

    FunctionsFilling, compressing of concrete
    Fields of applicationGenerally speaking, there are two fields of application.
    With industry:
    For filling purposes on packing bulk goods, powder, graphite, quartz flour (in the glass industry), granulate, …
    For the flask preparation (foundries)
    With building construction:
    For the compressing of concrete 
    Frequency rangeHigh frequency from 6,000 to 9,000 min-1
    This does not apply to air vibrators.
    The frequency depends on the type of the material particles to be moved.


    The smaller the grain size, the higher the frequency.
    In most cases:
    6,000 min-1 with most materials and with concrete
    Up to 9,000 min-1 with very small grain-type materials or concreteException:
    3,000 min-1 with very dry concreteFrequencies in min-1        6.000    9.000

    Amplitude in mm        0,3 – 0,4    0,2 – 0,25 
    Power requierementa) With industry:
    Factor “g” = 0.8 to 1.5 of the total mass to be vibrated. Mass of the material plus mass of the installation and the vibrators


    0,8 =< g =< 1,5b) With building construction:
    Very different depending on the forms and on the boarding.

    Please contact our company!

     

     

     


    Special applications

     

    FillingAllows for up to 20% of additional cubic content
    Direction of force

    Type of vibrationCircular vibration
    High frequency: 6 to 900 rpm depending on the graining of the material particles.
    The smaller the grain size, the higher the frequency

    Mounting spotMounting on the lower lateral part of the structure

     

     

     

    Prior to the vibration
    After the vibration

    Compression of concreteon vibrating tables: compression of stone blocks, flasks
    Direction

    Type of vibration3.000 upmFactor "g": up to 1,5Exceptionally: 2,5

    Calculation examples

    (the mass to be moved amounts to 100 kg!)

    Conveying

     

    Electric vibratorsPneumatic vibrators
    Mean working frequency:1.500 min-1not required
    Mean value of factor “g”:22
    Nominal power required:F = 2 x 100 = 200 daNF = 2 x 100 = 200 daN
    Correctionnone200 / 0,85* = 235 daN
    By TypeWEV 10/02/4VT24

    * Correction value with VT types

    Dissolving

    Electric vibratorsPneumatic vibrators
    Mean working frequency:3.000 min-1not required
    Mean value of factor “g”:2,72,7
    Nominal power required:F = 2,7 x 100 = 270 daNF = 2,7 x 100 = 270 daN
    Correctionnone270 / 0.85* = 317 daN
    By TypeWEV 10/14/2VT 31

    * Correction value with VT types

    Compressing

    Electric vibratorsPneumatic vibrators
    Mean working frequency:3.000 min-1not required
    Mean value of factor “g”:1,21,2
    Nominal power required:F = 1,2 x 100 = 120 daNF = 1,2 x 100 = 120 daN
    Correctionnone120 / 0,85* = 141 daN
    By TypeWEV 05/14/2VT 16

    * Correction value with VT types

     

     


    (1) In this case the VT 24 could be replaced by another type of pneumatic vibrator (but only on the customer’s demand, as the turbine type only has advantages with regard to ball or roller vibrators):

    a) by a VK vibrator:

    After correction, the output indicated for a VK has to amount to:    
    200 / 0.6 = 333.5 daN, i.e. 3,335 N.
    Checking the tables in the prospectuses shows that this output is granted by a VK26.

    b) by a VR vibrator:

    After correction, the output indicated for a VR has to amount to:    
    200 / 0.35 = 571.5 daN, i.e. 5,715 N.
    Checking the tables in the prospectuses shows that this output is granted by a VK78.

    (2) In this case, and by a similar calculation, the V31 allows to be replaced:

    a) by a VK vibrator:

    266 / 0.6 = 443.5 daN, i.e. 4,435 N   ->   VK 26

    b) by a VR vibrator:

    266 / 0.35 = 760 daN, i.e. 7,600 N   ->   VR 78

    (3) In this case, and by a similar calculation, the VT 16 allows to be replaced:

    a) by a VK vibrator:

    121 / 0.6 = 201 daN, i.e. 2,010 N   ->   VK 22

    b) by a VR vibrator:

    121 / 0.35 = 346 daN, i.e. 3,460 N   ->   VR 47


    Important Information

    Information fpr the selection of the right type of vibration

    Each vibrator type features advantages, disadvantages and application limits each customer should know well.

    Pneumatic vibrators

     

    AdvantagesDisadvantages
    - HIGH FLEXIBILITY: they adapt frequency and amplitude by themselves in each case.
    - HIGH FREQUENCY: they are particularly suitable for small-particle materials, e.g. powder etc.- EXPLOSION-PROOF: an absolute necessity with dusty atmospheres. With electric vibrators, there is always the danger of a short circuit with explosion-proof devices, too.

    - TEMPERATURE-RESISTANT: they resist temperatures up to and more than 200 °C (particularly important for foundries). ASK FOR TYPE “UCV“!

    - COMMPRESSED AIR SUPPLY: available in most factories.

    - They feature a small installation mass when compared to their performance. With each type, the limit values are close to the following values

    Please pay special attention to the performance data shown in the prospectus.
    - HIGHER ENERGY COSTS
    - Roller vibrators require pneumatic air-line lubrication
    - LOUD: with the exception of type VT with a maximum of 70 dBA.


     

     

     


    Electric vibrators

     

    AdvantagesDisadvantages
    - ENERGY-SAVING
    - CLEAN
    - LOW-NOISE
    - ADJUSTABLE CENTRIFUGAL FORCE: by means of readjusting the unbalance units
    - LARGE SCALE OF PERFORMANCE: Please pay special attention to the performance data in the prospectus.

    - UNFLEXIBILITY: frequency variation available at high costs only.

    - NOT EXPLOSION-PROOF in dusty atmosphere; with explosion-proof models, too, there is the chance of a short circuit due to the external cable.


    - TEMPERATURE-SENSITIVE: there is danger with temperatures exceeding 50 to 70 °C
    - Big installation mass in comparison with the performance.