Dear Mr. Nordell,

A brute force vibrating conveyor is a vibrating conveyor with the driving frequency far below natural frequency.

The natural frequency vibrating conveyor is a vibrating conveyor with the driving frequency near to natural frequency.

In the case of natural frequency conveyors there is more power needed to deflect the fiberglas leaf springs, because the leaf springs of a natural frequency conveyor are stiff.

Natural frequency conveyors are ofted used because there is needed less driving power, but at the startup of the vibrating conveyor there is more power needed, because of the stiff springs.

Could anyone explain to me why a natural frequency conveyor is preferred?

regards

Harm van der Pol ■

I want to know this, because i have to calculate the needed power tot startup the vibrating conveyor.

It is a vibrating conveyor with natural frequency springs and a eccentric crank arm drive system. The amplitude or eccenter radius is 5mm (10mm stroke). The frequency is 20 Hz. The totall vibrating mass is 300 kg.

I thougt i could calculate the driving force by F=k*u

k=spring stiffnes

u=amplitude

The torque T needed is F * eccenter radius.

The motor power P = T * omega= 14 Kw

I think this is far to big!!

Could anyone help me?

regards

Harm van der Pol

Student Fontys University of Professional Education (Eindhoven, the Netherlands) ■

Greetings again Harm

May I suggest you contact a gentleman by the name of Michael Asheton at our Australian Office via their web site at www.schenck.com.au. He will be able to give you a load of advise, or at least will know someone who can.

All the best ■

Thanks! ■