Description

  • High-performance vibration conveyor from ARBO Systems
  • Resonance frequency drive unit for flow rates from 10 kg/h to 10 t/h
  • The transported material flows with constant speed
  • The flow rate is independent from load changes

Important Features

  • The drive unit uses a concept for controlling the vibration resonance
  • The drive frequency synchronizes to the resonance frequency within split second
  • The vibration amplitude is controlled in a very large operational range (up to 1000:1)
  • The vibration amplitude is absolute linear to the target value (0.04 … 4 mm)
  • The current consumption is low at a high flow rate (< 1 A at 10 t/h)
  • The drive unit is maintenance-free and quiet

Further Benefits of the Control Concept

  • Any mechanical adjustment of the resonance frequency is obsolete
  • Small and large vibration amplitudes are controlled safely
  • The permissible conveying trough weights are larger than previously
  • The vibration amplitude and the flow rate are linear to the target value
  • The vibration amplitude is independent of load changes
  • The drive unit operates independent of fluctuations in the mains supply, the ambient temperature and other disturbances
  • A soft start ensures an overshoot-free run-up of the drive unit

Technical Characteristics of our Vibration Conveyors

Type FA6 AF14 AF15
Empty weight 6 kg 14 kg 14 kg
Max. vibration amplitude 1.75 mm 4.0 mm 2.5 mm
Max. current consumption 0.35 A 0.75 A 1.0 A
Power supply 230 V AC
Temperature range -5 … 60°C
Protection class IP 55
  P1030537
FA 6

af 14
AF 14/15

 Operating mode

Vibration conveyor drives are magnetically propelled two-mass-oscillators with

  • a drive base (the largest mass),
  • a conveyor table with an installed conveying trough and a charge (the useful load) and
  • the leaf spring elements (they connect the useful load to the drive base).

The useful load and the leaf spring elements form a resonance system with a narrow band, the mechanical resonance frequency. Any change in the useful load or the leaf spring elements varies this resonance frequency.

The stable operation of a conventional vibration conveyor has tight operational limits, because

  • the drive frequency and the resonance frequency may not collide (“resonance disaster“) and
  • the drive frequency must be close to the resonance frequency for any useable excitation

Any change of the useful load (e.g. a changed trough load) enforces an expensive adjustment (e.g. by installing add-on weights or exchanging the leaf spring elements). Any inadequate adjustment results in

  • a reduced flow rate (too small vibration amplitude) or
  • an unstable operation (the vibration amplitude builds up)

Another disadvantage of the conventional technology: the flow rate is non-linear to the excitation voltage (corresponding to an exponential function with a very large gradient).

The company ARBO Systems now completely breaks with this tradition. The new vibration conveyor drive

  • forms the dynamic drive unit
  • has an integrated linear tachometer generator
  • integrates two control loops for the drive frequency and the vibration amplitude
  • synchronizes to the resonance frequency within split second

Note: The vibration conveyor allows for dual- or multiple-drive arrangements, in which one tachometer generator usually is sufficient.

The linear tachometer generator

  • consists of one generator coil (fixed to the drive unit) and one permanent-magnet (fixed to the conveyor trough)
  • acquires the vibration velocity between the drive unit and the conveyor trough
  • supplies the reference signal for the frequency- and amplitude controller

Note: The linear tachometer generator is ideal for retrofitting conventional vibration conveyors. They will considerably improve.

The frequency control loop synchronizes the drive frequency to the oscillating system (it is not the conventional way, where the resonance frequency has to be adjusted)

The amplitude control loop

  • controls and limits the excitation energy (Any overshoot will be safely avoided.)
  • ensures an exact proportional behaviour between the vibration amplitude and the target value (Disturbances such as load changes are compensated.)

Notes:

  • The vibration displacement amplitude is set to a value between 0.5 and 4 mm.
  • The power consumption is minimized (When switching off the excitation voltage in the power stage, a counter-voltage is induced. This counter voltage is fed via a transistor-diode bridge into an energy storage.)
  Sieve trough
Sieve trough

Wide trough
Wide trough

20 m3/h Conveyor trough
20 m3/h Conveyor trough

Breitrinne 1500

Wide trough 1500



Conveyor pipe made of glass
Conveyor pipe made of glass